CN103312262B - Motor drive, fluid compression system and air conditioner - Google Patents

Motor drive, fluid compression system and air conditioner Download PDF

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Publication number
CN103312262B
CN103312262B CN201210303481.4A CN201210303481A CN103312262B CN 103312262 B CN103312262 B CN 103312262B CN 201210303481 A CN201210303481 A CN 201210303481A CN 103312262 B CN103312262 B CN 103312262B
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China
Prior art keywords
temperature
motor
threshold value
current
protection threshold
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CN201210303481.4A
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Chinese (zh)
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CN103312262A (en
Inventor
奥山敦
梅下贵明
黑崎真由
斯瓦潘·比斯沃斯
小仓洋寿
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Hitachi Johnson Controls Air Conditioning Inc
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Johnson Controls Hitachi Air Conditioning Technology Hong Kong Ltd
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The present invention provides motor drive, fluid compression system and the air conditioner that a kind of reliability is high.Possesses element short protected location (12), it exceedes at the current value inputted from amperometric (20) makes the driving of switch element stop in the case of preventing the short-circuit protection threshold value of the short circuit in inverter circuit (11), inverter control unit (40) estimates the motor current of inflow motor (M) according to the current value inputted from amperometric (20), and this motor current exceed the temperature protection to switch element and/or motor (M) subtract other current thresholds that magnetic protection is relevant in the case of, perform to make the process driving stopping of switch element, the process of executive component short-circuit protection unit (12) in the case of staying out of microcomputer, the process of inverter control unit (40) is performed in the case of getting involved microcomputer.

Description

Motor drive, fluid compression system and air conditioner
Technical field
The present invention relates to the driving means of motor, fluid compression system and air conditioner.
Background technology
Room air is sent into heat exchanger by making the indoor fan being arranged at indoor equipment rotate by air conditioner, Carry out heat exchange so that described air to be heated or cooled with the cryogen of circulation in heat exchanger, by indoor fan to Indoor air-supply, thus carry out air regulation.The one of heat pump cycle is constituted it addition, be provided with in the outdoor equipment of air conditioner The compressor of part, is compressed cryogen by this compressor and spues with the form of high temperature, high pressure.
It addition, the permanent magnet possessed as the motor of compressor, in the case of paying attention to price, use ferrite Magnet, uses the rare earth magnet of neodymium magnet etc. in the case of paying attention to performance.Wherein, ferrimagnet has the ring at low temperature Easily subtracting the characteristic of magnetic under border, rare earth magnet has the characteristic the most easily subtracting magnetic.Here, " subtracting magnetic " refers to, by The opposing magnetic field etc. that the temperature caused in the eddy-current loss because of magnet rises, causes because flowing into the electric current of coil, causes magnetic The magnetic moment minimizing that body is overall.
, in the environment of employing air conditioner, the temperature of the surrounding motors within compressor is in the winter time Heating runs becomes the low-down low temperature roughly equal with external air temperature when starting, when the refrigeration in summer runs due to The extraneous air of high temperature runs and becomes the highest high temperature.
Therefore, it is arranged at the inevitable driving under low temperature environment or hot environment of compressor of outdoor equipment, and requires relatively High driving force.If wanting to play higher driving energy according to service requirement based on indoor temperature or outdoor temperature etc. Power, then need to increase the electric current flowed in the motor.Then, the most concomitantly, there is the permanent magnet that motor is possessed (ferrimagnet or rare earth magnet) can subtract the misgivings of magnetic.
It addition, in addition to preventing from subtracting magnetic, in order to prevent from being arranged at the breakage of the switch element of inverter circuit, in addition it is also necessary to By the electric current suppression of flowing in switch element below the allowable current value of regulation.
As the prior art for partial these problems of reply, known following technology.
Such as, patent documentation 1 has been recorded following compressor brushless motor driving apparatus: based on DC current detecting The output of circuit (amperometric) and by phase current operational part (electric current reproducing unit) computing motor phase current, and have at this The electric current of motor phase current reduces brushless motor (motor) frequency in the case of becoming more than the threshold value of regulation limits Function.
In the technology described in patent documentation 1, stop threshold by the overcurrent protection that will be determined by voltage comparator circuit Value is changed to less than the setting subtracting magnetoelectricity stream, and prevent permanent magnet subtracts magnetic.
It addition, recorded following technology in patent documentation 2: control circuit is to IGBT (Insulated Gate Bipolar Transistor) carry out conduction and cut-off and control to drive motor, and have input electric current from current limit circuit Make IGBT be in cut-off state in the case of limiting command signal, cut off motor current.Additionally, described electric current limits electricity Road, when load current has exceeded the overcurrent higher limit of regulation, limits current to command signal and exports to control circuit.By This, it is therefore prevented that the permanent magnet that motor is possessed subtract magnetic.
Patent documentation 1: Japanese Unexamined Patent Publication 2009-198139 publication
Patent documentation 2: Japanese Unexamined Patent Publication 07-337072 publication
, in the case of the short circuit current that causes due to misoperation etc. having flowed in inverter circuit, in order to anti- The only destruction of switch element, and need to make inverter circuit stop at instantaneous (within the most several μ sec).
But, in the technology described in patent documentation 1,2, owing to carrying out to inverter circuit via microcomputer Stop instruction, so the delay of the circulation time (substantially 10～hundreds of μ sec) of microcomputer can be produced.It is then desired to it is pre- Survey circulation time and the action threshold value of overcurrent protection unit is set to lower than original threshold value.If additionally, using micro- The situation that the circulation time of type computer is short, then it can be avoided that this problem, but than the microcomputer that circulation time is a few μ sec Calculation machine is used for the situation of common household appliances, and price is high.Therefore, if by this microcomputer-equipped in air regulation Device, then the price competitiveness of product can decline.
Summary of the invention
Therefore, the problem of the present invention be to provide motor drive that a kind of reliability is high, fluid compression system and Air conditioner.
In order to solve above-mentioned problem, the present invention provides a kind of motor drive, it is characterised in that possess element short Protected location, it exceedes the short circuit guarantor for preventing the short circuit in inverter circuit at the current value inputted from current detecting unit The driving making switch element in the case of protecting threshold value stops, and control unit is according to the current value inputted from described current detecting unit Estimate the motor current of inflow motor, and this motor current exceed the temperature protection with described switch element and/ Or described motor subtract other current thresholds that magnetic protection is relevant in the case of, perform to make the driving of described switch element stop Process, in the case of staying out of microcomputer, perform the process of described element short protected location, get involved microcomputer The process of described control unit is performed in the case of calculation machine.
Invention effect
In accordance with the invention it is possible to provide motor drive, fluid compression system and air that a kind of reliability is high to adjust Joint device.
Accompanying drawing explanation
Fig. 1 is the system pie graph including motor drive of the first embodiment of the present invention.
Fig. 2 (a) is the flow chart of the handling process representing overcurrent detection unit, and (b) is to represent element short protected location The flow chart of handling process.
Fig. 3 is to be schematically illustrated in inverter circuit flowing to have the timeliness of the motor current when short circuit current to become The explanatory diagram changed.
Fig. 4 is the system pie graph including motor drive of the second embodiment of the present invention.
Fig. 5 be represent in employing the motor with the permanent magnet that low temperature subtracts magnetic characteristic, relative to motor around The group element absolute amount definite value of temperature, motor subtract magnetoelectricity stream, motor subtracts magnetic protection threshold value and element short protection threshold value The curve chart of change.
Fig. 6 be represent in employing the motor with the permanent magnet that high temperature subtracts magnetic characteristic, relative to motor around The group element absolute amount definite value of temperature, motor subtract magnetoelectricity stream, motor subtracts magnetic protection threshold value and element short protection threshold value The curve chart of change.
Fig. 7 is the system pie graph including motor drive of the third embodiment of the present invention.
Fig. 8 be represent the component temperature of the switch element having relative to inverter circuit, element absolute amount definite value, unit The curve of the change of part short-circuit protection threshold value, temperature damage current value, component temperature protection threshold value and current limit threshold Figure.
Fig. 9 is to represent the component temperature protection that the motor drive of the third embodiment of the present invention is possessed The flow chart of the handling process of overcurrent detection unit.
Figure 10 is the system pie graph including motor drive of the fourth embodiment of the present invention.
Symbol description
100,100A, 100B, 100C motor drive
10 power models (power module)
11 inverters (inverter) circuit
12 element short protected locations
13 inverter driving circuits
20 amperometrics (current detecting unit)
30 amplifiers
40,40A, 40B, 40C inverter control unit (control unit)
41 motor current reproducing units
42 speed command portions
43 overcurrent detection units (control unit)
44 drive signal generator (control unit)
45 motor subtract magnetic protection threshold value configuration part (control unit)
46 motor subtract magnetic protection overcurrent detection unit (control unit)
47 component temperatures protection threshold value configuration part (control unit)
48 component temperatures protection overcurrent detection unit (control unit)
50 electromotor winding temperature detectors (winding temperature detector unit)
60 component temperature detectors (component temperature detector unit)
200 alternating current power supplys
300 transducers (converter) circuit
M motor
Detailed description of the invention
Hereinafter, embodiments of the present invention are suitably described in detail with reference to the attached drawings.Additionally, for the most public Part and give same symbol, and the repetitive description thereof will be omitted.
" the 1st embodiment "
<system composition>
Fig. 1 is the system pie graph including motor drive of the first embodiment of the present invention.Exchange Power supply 200 represents the power supply of the alternating electromotive force by power transmission and distribution such as power plant (not shown).
Converter circuit 300 is the circuit that the alternating voltage inputted from alternating current power supply 200 is transformed into DC voltage, possesses Diode D1, D3 are positively connected in series and using junction point each other as the diode bridge of switch input. Additionally, be also same about diode D2, D4.It addition, the ripple component for being comprised this DC voltage smooths The smoothing capacity device C changed, is connected in parallel with above-mentioned diode bridge.
Further, " unidirectional current is constituted by alternating current power supply 200 and the converter circuit 300 being connected with this alternating current power supply 200 Source ".
The DC voltage conversion that motor drive 100 will be inputted from converter circuit 300 by inverter control Export to motor M after becoming the alternating voltage of regulation.Additionally, the process carried out about motor drive 100 is detailed Described below.
Motor M e.g. permanent-magnet type synchronous motor, is connected with inverter circuit 11 via three-phase windings. I.e., motor M attracts the permanent magnetic as rotor according to the rotating excitation field manufactured by the alternating current of inflow three-phase windings Body (not shown), thus rotate.Additionally, the heat pump that motor M is such as used for constituting air conditioner (not shown) follows The compressor (not shown) of ring.
<composition of motor drive>
As it is shown in figure 1, motor drive 100 possesses: power model 10, amperometric 20, amplifier 30 and Inverter control unit 40.
Power model 10 use for motor M output regulation alternating voltage include that multiple switch element (is not schemed Show) at interior inverter circuit 11, for protecting the element short protected location 12 of switch element and for driving switch unit The inverter driving circuit 13 of part is summed up to be constituted ground integratedly.
Amperometric (current detecting unit) 20 is connected in series between converter circuit 300 and inverter circuit 11 Bus, detects the DC current to inverter circuit 11 supply and exports momently to amplifier 30 and element short protection Unit 12.
Amplifier 30 such as has transistor, is amplified by the detection signal inputted from amperometric 20, and exports Motor current reproducing unit 41 to inverter control unit 40.
Inverter control unit (control unit) 40 is based on the detection signal inputted from amplifier 30 and the rotation of motor M Speed value ω carrys out computing should put on the alternating voltage of motor M, and exports after being transformed into driving signal.
Additionally, rotational speed command value ω be based on the design temperature information inputted from remote controllers (not shown), by The indoor temperature that the critesistor (not shown) of indoor equipment (not shown) detects etc. and determine, the rotary speed of motor M Command value.
(1. power model)
Power model 10 possesses: inverter circuit 11, element short protected location 12 and inverter driving circuit 13.
Inverter circuit 11 has multiple switch element (not shown), according to the PWM inputted from inverter driving circuit 13 Signal switches connection (the on)/disconnection (off) of each switch element, and exports the three-phase alternating voltage of regulation to motor M.Further, three-phase alternating current inflow motor M corresponding with this three-phase alternating voltage, to produce above-mentioned rotating excitation field.
Additionally, the switch element being had as inverter circuit 11, such as, can use IGBT.
Element short protected location 12 compares the current detection value from amperometric 20 input and element set in advance Short-circuit protection threshold value, and in the case of above-mentioned current detection value exceedes element short protection threshold value, stop instruction signal is defeated Go out to inverter driving circuit 13.
Additionally, the process of executive component short-circuit protection unit 12 in the case of staying out of microcomputer.
Inverter driving circuit 13, according to from the driving signal driving signal generator 44 to input, has to inverter circuit 11 Each switch element (not shown) output pwm signal (Pulse Width Modulation: pulse width modulating signal) having. It addition, in the case of have input stop instruction signal from element short protected location 12, inverter driving circuit 13 stops PWM The output of signal.
(2. inverter control unit)
Inverter control unit (control unit) 40 possesses: motor current reproducing unit 41, speed command portion 42, overcurrent Detection unit 43 and driving signal generator 44.Additionally, by microcomputer (Microcomputer) (or get involved microcomputer Calculation machine) perform the process of inverter control unit 40.Microcomputer is configured to include CPU (Central Processing Unit), the electronic circuit of ROM (Read Only Memory), RAM (Random Access Memory), various interfaces etc. is (not Diagram), the program that will be stored in ROM reads and is deployed in RAM, CPU perform various process.
Motor current reproducing unit 41 is based on being detected by amperometric 20 and being exaggerated the inspection after device 30 amplifies further Survey signal, be reproduced in motor M the electric current (being designated as motor current below) of flowing, and export to overcurrent detection unit 43。
Speed command portion 42 is based on the motor current inputted from motor current reproducing unit 41 and from outside input Rotational speed command value ω, calculates three-phase alternating current command voltage and the PWM frequency command value that put on motor M, And export to driving signal generator 44.
Overcurrent detection unit 43 compares the motor current from motor current reproducing unit 41 input and is stored in microcomputer Overcurrent threshold value (other threshold values) in calculation machine, and to driving signal in the case of motor current has exceeded overcurrent threshold value Generating unit 44 exports stop instruction signal.Additionally, the most described below about overcurrent threshold value.
Signal generator 44 is driven to generate driving signal based on the described command value inputted from speed instruction department 42, and defeated Go out to inverter driving circuit 13.It addition, in the case of have input above-mentioned stop instruction signal from overcurrent detection unit 43, Signal generator 44 is driven to stop driving the generation of signal to process according to this instruction.
Hereinafter, explanation overcurrent detection unit 43 is carried out successively determination processing and element short protected location 12 are carried out Determination processing.
Wherein, overcurrent detection unit 43 is actual different about producing after several more than msec from detecting abnormal signs Often (imbalance etc. of motor M), determination processing is carried out.On the other hand, element short protected location 12 is about through a few μ sec Produce actual abnormal (short circuit etc. of inverter circuit 11) afterwards, carry out determination processing.
<process of overcurrent detection unit>
Overcurrent detection unit 43 as described above, compare from motor current reproducing unit 41 input motor current and The overcurrent threshold value being stored in microcomputer, in the case of motor current has exceeded overcurrent threshold value (other threshold values) The process making driving signal generator 44 stops.
The process of overcurrent detection unit 43 is performed by microcomputer (not shown).Therefore, overcurrent detection unit 43 can Complicated calculating formula is utilized to carry out high-precision judgement.Additionally, micro-needed for the determination processing carried out in the present embodiment The operation time of type computer is 10 μ sec～hundreds of μ sec.
Additionally, pass through inverter control from detecting that inverter circuit 11 overcurrent plays by amperometric 20 Unit 40 makes the time Δ t till the action stopping of inverter circuit 11pAs follows.
I.e., above-mentioned time Δ tpIt is to be input to inverter control unit 40 until the signal from amperometric 20 be Time Δ t onlyp1, until in inverter control unit 40, be judged to overcurrent and make driving signal generator 44 stop be Time Δ t onlyp2 and until the driving signal accepting inverter control unit 40 stop and inverter circuit 11 actual at Time Δ t till off-statepThe total of 3, (formula 1) as shown below.
Δtp=Δ tp1+Δtp2+Δtp3 (formulas 1)
Here, amperometric 20, from amperometric 20 to inverter control unit 40, from inverter control list Unit 40 arrives between inverter circuit 11 and inverter circuit 11, by staying out of microcomputer, so-called hardware circuit structure Become.Therefore, until the signal from amperometric 20 to be transferred to the time Δ t of inverter control unit 40p1, with And until the signal that drives accepting inverter control unit 40 stops and the time Δ t of inverter circuit 11 disconnectionp3, point Wei a few μ sec.
On the other hand, performed from have input from electricity by microcomputer (not shown) due to inverter control unit 40 The detection signal of current sensor 20 plays and exports the process till stop instruction signal to inverter driving circuit 13, so that 10 μ sec～the time of hundreds of μ sec.Then, above-mentioned (formula 1) the time Δ t illustratedpAlso it is 10 μ sec～hundreds of μ sec.
Therefore, the process using the overcurrent detection unit 43 of microcomputer is applicable to examine like that from imbalance as escribed above Measure the characteristic needing a few more than msec till abnormal (sign) plays this impact of generation.
Such as, as being applicable to determination processing based on the overcurrent detection unit 43 employing microcomputer, enumerate: electricity Motivation M imbalance protection, motor M winding temperature protection, motor M subtract magnetic protection, the temperature of switch element (not shown) Degree rises protection, the over-temperature protection of compressor (not shown), the pressure protection etc. of compressor.These characteristics are due to electrical time Constant, thermal capacity etc. and until producing the abnormal time needing a few more than msec, even if thus employing miniature calculating The process of machine also can be tackled fully.
Additionally, in this determination processing, it is possible to use the amplitude of motor current and phase place, motor to execute alive The control information of amplitude and phase place, the magnitude of voltage being input to the direct current of inverter circuit 11 and current value etc..
Alternatively, it is also possible to use according to room temperature critesistor (not shown), extraneous air temperature critesistor (not shown), knot Frost critesistor (not shown), temperature critesistor (not shown) that spues, human body detection sensor (not shown), thermoelectric pile (are not schemed Show) etc. acquirement sensor information.
In the present embodiment, as an example of the determination processing carried out by overcurrent detection unit 43, illustrate detection electricity The sign during imbalance of motivation M (, from the increase of electric current of amperometric 20 input) also makes the situation that motor M stops.
As above-mentioned, synchronous motor attracts rotor (permanent magnet) by the rotating excitation field manufactured by alternating current, Thus rotate.But, when overload, velocity variations drastically etc., lose sometimes from inverter driving circuit 13 Synchronization between pwm signal and the rotation of motor M of input, thus cause imbalance.
Here, before causing imbalance in motor M, apply voltage and become big with the deviation of motor-induced voltage.Such as, In the case of the phase controlling being carried out voltage x current by vector majorization, needed several before causing the imbalance of motor M The time of hundred msec, thus motor current increases.
Therefore, overcurrent detection unit 43 compares the overcurrent decision threshold (other threshold values) of the regulation prestored and electronic Dynamo-electric flow valuve, and in the case of motor current value has exceeded overcurrent decision threshold, make the place of driving signal generator 44 Reason stops.Thus, motor drive 100 can make motor M's in the case of detecting imbalance (sign) at once Drive and stop.
Wherein, overcurrent decision threshold can be fixed value set in advance, it is also possible to by overcurrent detection unit 43 based on The deviation etc. of the phase place applied between voltage and induced voltage of motor M calculates optimal overcurrent decision threshold.
Fig. 2 (a) is the flow chart of the handling process representing that overcurrent protection detection unit carried out.Additionally, in following note In load, sometimes by according to making the switch element of inverter circuit 11 carry out ON/ from the pwm signal of inverter driving circuit 13 OFF action, is individually designated as " driving of switch element ".It addition, when the beginning of the flow chart shown in Fig. 2 (a), if switch element Just drive.
In step S101, overcurrent detection unit 43 judge from process start whether have passed through stipulated time Δ tA.Its In, it is stipulated that time Δ tAFor the circulation time of the microcomputer of the process for performing overcurrent detection unit 43, it is to set in advance Fixed value.
Stipulated time Δ t is have passed through starting from processAIn the case of (S101 → "Yes"), overcurrent detection unit 43 Process enters step S102.On the other hand, not through stipulated time Δ t start from processAIn the case of (S101 → "No"), overcurrent detection unit 43 is repeated the process of step S101.
In step s 102, overcurrent detection unit 43 judges the motor current value from motor current reproducing unit 41 input IMWhether more than overcurrent threshold value I specifiedE(other threshold values).
In motor current value IMMore than overcurrent threshold value IEIn the case of (S102 → "Yes"), overcurrent detection unit 43 Process enters step S103.On the other hand, in motor current value IMFor overcurrent threshold value IEIn the case of below (S102 → "No"), the process of overcurrent detection unit 43 returns to " beginning ".
In step s 103, overcurrent detection unit 43 makes the driving of switch element stop.Its result, to the electricity of motor M Power supply terminates, and motor M stops.
<process of element short protected location>
Fig. 2 (b) is the flow chart of the handling process representing that element short protected location carried out.Wherein, at this flow chart Beginning time, if the switch element of inverter circuit 11 just drives.
In step s 201, element short protected location 12 judge from process start whether have passed through stipulated time Δ tB.Wherein, it is stipulated that time Δ tBIt is the circulation time of element short protected location 12, is value set in advance.
Stipulated time Δ t is have passed through starting from processBIn the case of (S201 → "Yes"), element short protected location The process of 12 enters step S202.On the other hand, not through stipulated time Δ t start from processBIn the case of (S201 → "No"), element short protected location 12 is repeated the process of step S201.
In step S202, element short protected location 12 judges the current detection value I from amperometric 20 inputSIt is No more than element short protection threshold value ID。
At current detection value ISThreshold value I is protected more than element shortDIn the case of (S202 → "Yes"), element short protect The process of unit 12 enters step S203.On the other hand, at current detection value ISThreshold value I is protected for element shortDFollowing situation Under (S202 → "No"), the process of element short protected location 12 returns to " beginning ".
In step S203, element short protected location 12 exports stop instruction signal to inverter driving circuit 13.This Outward, if having input stop instruction signal from element short protected location 12, then the driving of the switch element of inverter driving circuit 13 Dynamic stopping, the driving of its result motor M also stops.
Additionally, the driving stopping of the switch element of result of determination based on overcurrent detection unit 43 processes and based on element The driving stopping of the switch element of the result of determination of short-circuit protection unit 12 processes, and separately performs.Such as, than base Stopping in overcurrent detection unit 43 processes and stopping based on element short protected location 12 processes in the case of being first performed, Motor M stops using the stop instruction signal exported from element short protected location 12 as triggering.
<effect>
According to motor drive 100 of the present embodiment, for from detecting that abnormal signs plays actual product Needing the characteristic (imbalance etc.) of the time of a few more than msec till raw impact, carry out employing microcomputer compares to determine place Reason, makes the driving of switch element stop as desired.Accordingly, because microcomputer makes the control relevant to motor M believe Breath, sensor information are able to carry out the calculating of complexity, it is thus possible to carry out high-precision determination processing.
I.e., compared with the timing that the calculation process of microcomputer terminates, the timing causing imbalance is relatively slow, it is possible to The driving making motor M before causing imbalance stops.
It addition, as above-mentioned, detect that overcurrent plays to inverter driving circuit 13 from element short protected location 12 defeated Time till going out stop instruction signal is the required time (such as, 3 μ sec) under the hardware circuit staying out of microcomputer, So it is extremely short.Thus, element short protection threshold value I is exceeded at the electric current detected by amperometric 20DIn the case of, based on The halt instruction of element short protected location 12 subtracts the halt instruction of magnetic protection overcurrent detection unit 46 earlier than based on motor Be output.Therefore, it is possible to be reliably prevented the destruction of the switch element caused because of short circuit current.
Fig. 3 is to be schematically illustrated in switch element flowing to have the Temporal changes of the motor current when short circuit current Explanatory diagram.Following situation considered below: from the moment t shown in Fig. 30Play motor current to steeply rise, at moment t1, by electricity Current sensor 20 detects and exceedes element short protection threshold value IDCurrent value I1。
Additionally, element absolute amount definite value I shown in Fig. 3REven being that motor current is set to moment and the most should not The value of the current value exceeded.
In this case, from moment t1Play elapsed time Δ tq(=a few μ sec) after moment t2, element short protect Unit 12 stopped the driving of switch element.Its result, from moment t2After, motor current drastically reduces (the reality with reference to Fig. 3 Line arrow), it is possible to avoid motor current to reach element absolute amount definite value IR.Additionally, this time Δ tqIt is shorter than the switch units such as IGBT The time (short circuit tolerance) of the resistance to firmly short circuit current of part.
In contrast, it is assumed that by microcomputer carry out element short protection threshold value determination processing in the case of, due to From moment t1Rise and have passed through time Δ tpMoment t after (=10 μ sec～hundreds of μ sec)3, the driving of switch element is stopped Only, so exceeding element absolute amount definite value IRMotor current I3Flow (with reference to the dotted arrow of Fig. 3), thus causes out Close the destruction of element.
According to motor drive 100 of the present embodiment, at the inverter control list as microcomputer The outside of unit 40 arranges element short protected location 12, performs determination processing in the case of staying out of microcomputer.Thus, The lifting of electric current when can catch inverter circuit 11 short-circuit rapidly, and make driving of switch element in the midway of this lifting Dynamic stopping such that it is able to being reliably prevented the destruction of switch element.
It addition, because process faint electric current in electronic circuit, so being vulnerable to effect of noise.In present embodiment In the motor drive 100 related to, it is possible to make the driving of switch element stop rapidly with the time of a few μ sec.Therefore, Threshold value can be protected to be set as element short: to can be determined that as reliably creating short circuit in inverter circuit 11 such Value.I.e., because element short can be protected threshold value be raised near element absolute amount definite value, it is possible to eliminate because noise is led The misoperation (stopping of motor M) caused.
" the 2nd embodiment "
Motor drive 100A of the second embodiment is substituted in the 1st embodiment the overcurrent illustrated Detection unit 43 and possess motor and subtract magnetic protection overcurrent detection unit 46, be also equipped with electromotor winding temperature detector 50 and electronic Machine subtracts magnetic protection threshold value configuration part 45, and in addition to above-mentioned point, remaining is all identical with the 1st embodiment.Therefore, to different piece Illustrate, and omit the explanation to repeating part.
<composition of motor drive>
Fig. 4 is the system pie graph including motor drive.
The electromotor winding temperature of electromotor winding temperature detector (winding temperature detector unit) 50 detection motor M, And at every moment export to motor subtract magnetic protection threshold value configuration part 45.
Motor subtract magnetic protection threshold value configuration part 45 according to the motor inputted from electromotor winding temperature detector 50 around Group temperature sets for preventing the magnetic that subtracts subtracting magnetic of permanent magnet from protecting threshold value (other threshold values).Additionally, subtract about motor The process that magnetic protection threshold value configuration part 45 is carried out is described below.
Motor subtract magnetic protection overcurrent detection unit 46 based on the motor current inputted from motor current reproducing unit 41, And from motor subtract magnetic protection threshold value configuration part 45 input subtract magnetic protection threshold value, judge whether flow in motor M Exceed the overcurrent subtracting magnetic protection threshold value.Further, determine flowed in motor M exceed subtract magnetic protection threshold value mistake In the case of electric current, motor subtracts magnetic protection overcurrent detection unit 46 makes the process of driving signal generator 44 stop.
The situation of magnetic characteristic<low temperature subtract>
(1. motor subtracts the setting of magnetic protection threshold value)
In following record, the motor current value subtracted when magnetic will be caused in the permanent magnet that motor M has, It is designated as " motor subtracts magnetoelectricity stream ".
If permanent magnet is exposed in excessive opposing magnetic field, causing and subtract magnetic thus magnetic dies down, the characteristic of magnet is bad Change.If i.e. flowing super-high-current in the permanent magnet that motor M is used, then in the opposing magnetic field produced by this electric current Cause and subtract magnetic.Accordingly, it would be desirable to motor subtracts the overcurrent not inflow motor M of more than magnetoelectricity stream.
Motor subtract magnetic protection threshold value configuration part 45 based on the detection temperature inputted from electromotor winding temperature detector 50, Setting to become makes the magnetic that subtracts driving the threshold value when stopping of switch element protect threshold value (other threshold values), and exports to the most electronic Machine subtracts magnetic protection overcurrent detection unit 46.
Wherein, microcomputer operating motor the process of magnetic protection threshold value configuration part 45 is subtracted.
Fig. 5 be represent in employing the motor with the permanent magnet that low temperature subtracts magnetic characteristic, relative to motor around The group element absolute amount definite value of temperature, motor subtract magnetoelectricity stream, motor subtracts magnetic protection threshold value and element short protection threshold value The curve chart of change.
As it is shown in figure 5, there is low temperature subtract the permanent magnet (such as, ferrimagnet) of magnetic characteristic along with its temperature step-down Motor subtracts the value of magnetoelectricity stream and diminishes (i.e., becoming easily to subtract magnetic).
Therefore, motor subtract magnetic protection threshold value configuration part 45 be set to: become low temperature along with electromotor winding temperature and make Motor subtracts magnetic protection threshold value and diminishes.
It addition, motor subtracts magnetic protection threshold value subtracts magnetoelectricity according to both less than motor under arbitrary electromotor winding temperature The mode of the value of stream is set.Wherein, in the example as shown in fig. 5, in order to simplify the process of microcomputer software, with many Bar line segment represents that motor subtracts the temperature characterisitic of magnetic protection threshold value.
(the 2. setting of element short protection threshold value)
Element short protected location 12 prevents the element short of the short circuit of the switch element of inverter circuit 11 from protecting by being used for Protect threshold value IDIt is set as than element absolute amount definite value IRLower setting (with reference to Fig. 5).Additionally, element short protection threshold value ID Unrelated with the temperature of motor winding and be set to fixed value.
Even if in the present embodiment, the most in a same manner as in the first embodiment, hold in the case of staying out of microcomputer The process of units short-circuit protection unit 12, exceedes element short protection threshold value I at motor currentDWhen make switch element Drive and stop.
It addition, in the example as shown in fig. 5, in electromotor winding temperature T0In above region, motor subtracts magnetic protection Threshold value IMIt is set to protect threshold value I than element shortDLittle setting Δ I1(=ID-I0) fixed value.This is because, electronic Dynamo-electric stream has exceeded element short protection threshold value IDIn the case of, element short protected location 12 subtracts magnetic than motor and protected Electric current detection unit 46 and first stop the driving of inverter circuit 11.
Wherein, have motor subtract magnetic protection threshold value exceed element short protection threshold value temperature province (such as, high-temperature region Territory), also can subtract magnetic protection threshold value according to motor in other temperature province (such as, low-temperature region) is element short protection Mode below threshold value is set.
The situation of magnetic characteristic<high temperature subtract>
Fig. 6 be represent in employing the motor with the permanent magnet that high temperature subtracts magnetic characteristic, relative to motor around The group element absolute amount definite value of temperature, motor subtract magnetoelectricity stream, motor subtracts magnetic protection threshold value and element short protection threshold value The curve chart of change.
As shown in Figure 6, there is high temperature subtract the permanent magnet (such as, neodymium magnet) of magnetic characteristic and uprise and motor along with temperature The value subtracting magnetoelectricity stream diminishes (i.e., becoming easily to subtract magnetic).
Therefore, motor subtract magnetic protection threshold value configuration part 45 be set to: become high temperature along with electromotor winding temperature and make Subtract magnetic protection threshold value to diminish.
Wherein, in the example shown in Fig. 6, represent that motor subtracts the temperature characterisitic of magnetic protection threshold value with a plurality of line segment, In electromotor winding temperature T2In area below, motor is subtracted magnetic protection threshold value and is set as protecting threshold value I than component temperatureD High Δ I2 (=I2-ID) setting.Further, in electromotor winding temperature higher than temperature T3Region in, according to element short protect Protect threshold value to become to subtract the magnetic protection big mode of threshold value than motor and be set.
Subtract the permanent magnet of magnetic characteristic be not limited to neodymium magnet additionally, have high temperature, it is also possible to be other terres rares magnetic Body.
<action of motor drive>
Motor subtract magnetic protection threshold value configuration part 45 according to the motor inputted from electromotor winding temperature detector 50 around Group temperature sets the characteristic motor shown in Fig. 5 and subtracts magnetic protection threshold value, and subtracts magnetic to motor momently and protected electricity Stream detection unit 46 exports the information of described threshold value.
Further, motor subtract magnetic protection overcurrent detection unit 46 compare from motor current reproducing unit 41 input motor Electric current and from motor subtract magnetic protection threshold value configuration part 45 input motor subtract magnetic protection threshold value.
Motor current exceeded motor subtract magnetic protection threshold value in the case of, motor subtract magnetic protection overcurrent judge Portion 46 makes the process of driving signal generator 44 stop.Thus, the driving of switch element stops, to the power supply of motor M Terminate, thus motor M stops.
On the other hand, motor current be motor subtract magnetic protection threshold value below in the case of, motor subtract magnetic protection Overcurrent detection unit 46 is repeated above-mentioned comparison process by per stipulated time.
<effect>
According to motor drive 100A of the present embodiment, for possessing the low temperature with ferrimagnet etc. Subtract magnetic characteristic or, for the motor M of the high temperature of neodymium magnet etc. the permanent magnet that subtracts magnetic characteristic, it is possible to will be at motor winding The electric current of middle flowing is set to subtract magnetoelectricity stream less than motor, and can be reliably prevented permanent magnet subtract magnetic.I.e., passing through The control of microcomputer and time constant bigger subtracting after magnetic characteristic carried out the determination processing that precision is high, is made switch unit The driving of part stops.
Thus, as shown in Figure 5, Figure 6, it is possible to subtract magnetic according to electromotor winding temperature regulation motor the most meticulously Protection threshold value.I.e., due to can prevent motor M subtract magnetic can make again motor winding flowing corresponding to electromotor winding temperature Maximum electric current, it is thus possible to make the ability of motor M play to greatest extent.
On the other hand, must use at short notice in the case of disconnecting circuit such as switching element short-circuits when The circuit (element short protected location 12) staying out of microcomputer makes the driving of switch element stop.
Thereby, it is possible to prevent the magnetic that subtracts of the permanent magnet that motor M possessed, and can reliably protect inverter electricity The switch element on road 11.
It addition, can determine that electromotor winding temperature and motor subtract the phase between magnetic protection threshold value by multiple parameters Close.I.e., these constants are changed according only to motor M to be driven, it becomes possible to use same microcomputer software to correspond to Multiple permanent magnet, it is possible to simplify the exploitation of microcomputer software.Represent electronic with the curve of more than 1 (comprising straight line) Machine subtracts the temperature characterisitic of magnetic protection threshold value, in set point of temperature T0Motor is subtracted magnetic protection threshold value by above region and is set as solid Definite value IM(with reference to Fig. 5).Therefore, it is possible to reduce the process load of microcomputer.
" the 3rd embodiment "
Motor drive 100B of the third embodiment is substituted in the 1st embodiment the overcurrent illustrated Detection unit 43 and possess component temperature protection overcurrent detection unit 48, be also equipped with component temperature detector 60 and component temperature protection Threshold value configuration part 47, in addition to above-mentioned point, remaining is all identical with the 1st embodiment.Therefore, this different piece is said Bright, and omit the explanation to repeating part.
<composition of motor drive>
Fig. 7 represents the system pie graph including motor drive.
The switch element that component temperature detector (component temperature detector unit) 60 detection inverter circuit 11 is possessed Temperature, and detected component temperature is exported momently to component temperature protection threshold value configuration part.
Component temperature protection threshold value configuration part 47 sets unit according to the component temperature inputted from component temperature detector 60 Part temperature protection threshold value (other threshold values).Additionally, detailed about the component temperature protection process that carried out of threshold value configuration part 47 Described below.
Component temperature protection overcurrent detection unit 48 based on the motor current inputted from motor current reproducing unit 41, with And from the component temperature protection threshold value of component temperature protection threshold value configuration part 47 input, judge whether flow in motor M Exceed the overcurrent of component temperature protection threshold value.Further, flowed in motor M exceed component temperature protection threshold value mistake In the case of electric current, component temperature protection overcurrent detection unit 48 makes the process of driving signal generator 44 stop.
Wherein, by the process of microcomputer executive component temperature protection threshold value configuration part 47.
On the other hand, element short protected location 12 performs process in a same manner as in the first embodiment.I.e., element short is protected Protect unit 12 in the case of the electric current detected by amperometric 20 has exceeded short-circuit protection threshold value, in order to promptly stop Inverter circuit 11, and make the driving of switch element stop staying out of the circuit of microcomputer.Thus, at inverter circuit 11 create short circuit when can promptly make the driving of switch element stop, and the broken of switch element can be reliably prevented Bad.
Fig. 8 be represent the component temperature of the switch element having relative to inverter circuit, element absolute amount definite value, unit The curve of the change of part short-circuit protection threshold value, temperature damage current value, component temperature protection threshold value and current limit threshold Figure.
As shown in Figure 8, element short protection threshold value is set with the current value lower than element absolute amount definite value.It addition, Component temperature destroys the electricity that current value is the destruction causing switch element in the case of the electric current more than this current value that flows Flow valuve.Component temperature protection threshold value is set to destroy the current value of the little setting of current value than component temperature.It addition, electric current limit Threshold value processed is the threshold value when making motor M slow down, and is set to the current value than the component temperature protection little setting of threshold value.
As shown in Figure 8, by the region for more than component temperature protection threshold value and destroying current value less than component temperature, if It is set to " stop area ".It addition, by the region for more than current limit threshold and protecting threshold value less than component temperature, be set as " decelerating area ".It addition, the region less than current limit value is set as " stability region ".
Fig. 9 is the flow chart of the motion flow representing component temperature protection overcurrent detection unit.
In step S301, component temperature protection overcurrent detection unit 48 judge from process start whether have passed through regulation Time Δ tC.Additionally, stipulated time Δ tCIt is performed for the miniature calculating of the process of component temperature protection overcurrent detection unit 48 The circulation time of machine, is value set in advance.
Stipulated time Δ t is have passed through starting from processCIn the case of (S301 → "Yes"), component temperature protected electricity The process of stream detection unit 48 enters step S302.On the other hand, not through stipulated time Δ t start from processCFeelings Under condition (S301 → "No"), component temperature protection overcurrent detection unit 48 is repeated the process of step S301.
In step s 302, component temperature protection overcurrent detection unit 48 judges from motor current reproducing unit 41 input Motor current value IMWhether protect threshold value I more than component temperatureT.In motor current value IMThreshold value is protected more than component temperature ITIn the case of (S302 → "Yes"), component temperature protection overcurrent detection unit 48 process enter step S303.On the other hand, In motor current value IMThreshold value I is protected for component temperatureTIn the case of below (S302 → "No"), component temperature protected electricity The process of stream detection unit 48 enters step S304.
In step S303, component temperature protection overcurrent detection unit 48 makes the process of driving signal generator 44 stop. I.e., component temperature protection overcurrent detection unit 48 makes the driving of switch element stop.
Wherein, motor current be element short protection threshold value below and more than component temperature protection threshold value situation Under, the element short protected location 12 being made up of hardware circuit does not works.
In step s 304, component temperature protection overcurrent detection unit 48 judges motor current value IMWhether more than electric current Threshold limit IL.In motor current value IMMore than current limit threshold ILIn the case of (S304 → "Yes"), component temperature protect The process of overcurrent detection unit 48 enters step S305.On the other hand, in motor current value IMFor current limit threshold ILBelow In the case of (S304 → "No"), component temperature protection overcurrent detection unit 48 process return to " beginning ".
In step S305, component temperature protection overcurrent detection unit 48 is for making motor M slow down, and produces to driving signal The command signal of life portion 44 output regulation.
<effect>
According to motor drive 100B of the present embodiment, for from detecting that exception (sign) plays reality Need the temperature characterisitic of the switch element of the time of a few more than msec till producing extremely, carry out employing the ratio of microcomputer Relatively determination processing, makes the driving of switch element stop as desired.It addition, unit used when carrying out described comparison process Part temperature protection threshold value is to determine according to the component temperature from component temperature detector 60 input, it is possible to accurately Judge overcurrent.
Additionally, due to switch element has the thermal capacity of regulation, therefore causing switch destruction owing to temperature rises Before make the driving of motor M stop.
It addition, in component temperature protection threshold value configuration part 47, protect threshold value for component temperature, preset such as Fig. 8 As shown in make component temperature and component temperature protection threshold value set up (including straight line) rule of corresponding relation with the curve of more than 1 Determine arithmetic expression.Therefore, it is possible to the constant of above-mentioned arithmetic expression is set as appropriate value such that it is able to change setting simply, and Inverter circuit 11 even for xenogenesis also can make microcomputer software identical, it is possible to simplify the suitable of product development Sequence.
It addition, in the case of motor current is in circuit decelerating area (with reference to Fig. 8), component temperature protected electricity Stream detection unit 48 makes motor M slow down to the command signal driving signal generator 44 output regulation.Thereby, it is possible to reduce stream Entering the electric current of switch element, the temperature that can reduce switch element can maintain again the driving of motor M.
" the 4th embodiment "
The difference of motor drive 100C of the fourth embodiment and the 3rd embodiment is, adds Electromotor winding temperature detector 50, motor subtract magnetic protection threshold value configuration part 45 and motor subtracts magnetic protection overcurrent and sentences Determining portion 46, in addition to above-mentioned point, remaining is all identical with the 3rd embodiment.Therefore, different piece is illustrated, and omit To the explanation with the part of the 3rd embodiment repetition.
Figure 10 represents the system pie graph including motor drive.
The winding temperature of electromotor winding temperature detector (winding temperature detector unit) 50 detection motor M, and constantly Carve ground output and subtract magnetic temperature protection threshold value configuration part 45 to motor.
It is electronic according to input from electromotor winding temperature detector 50 that motor subtracts magnetic temperature protection threshold value configuration part 45 Machine winding temperature set subtract magnetic protection threshold value, and export to motor subtract magnetic protection overcurrent detection unit 46.
Motor subtracts magnetic protection overcurrent detection unit 46 and based on motor current and subtracts magnetic protection threshold value, at motor current Having exceeded makes the process of driving signal generator 44 stop in the case of subtracting magnetic protection threshold value.
Additionally, subtract magnetic protection threshold value configuration part 45 and motor about electromotor winding temperature detector 50, motor Subtract magnetic protection process performed by overcurrent detection unit 46, due to identical with the 2nd embodiment, therefore detailed.
It addition, perform the process of inverter control unit 40C in the case of getting involved microcomputer.I.e., according to switch The temperature characterisitic (low temperature subtracts magnetic characteristic or high temperature subtracts magnetic characteristic) of the permanent magnet that the temperature characterisitic of element, motor M possess and Set the most meticulously and subtract magnetic protection threshold value, make the driving of inverter circuit 11 stop as desired.
On the other hand, the process of executive component short-circuit protection unit 12 in the case of staying out of microcomputer.Thus, Element short protected location 12 from detect motor current exceeded element short protection threshold value moment in a few μ sec The driving making inverter circuit 11 stops.
<effect>
According to motor drive 100C of the present embodiment, microcomputer is used to perform inverter control The process of unit 40C.Thereby, it is possible to set according to the temperature of the switch element inputted from component temperature detector 60 suitable Component temperature protection threshold value, and can come according to the temperature of the motor winding inputted from electromotor winding temperature detector 50 Set the suitable magnetic that subtracts and protect threshold value.I.e., the permanent magnet that the temperature damage of switch element, motor M possess can be prevented Subtract magnetic, motor M can be made to drive according to electric current to greatest extent again.
Therefore, according to motor drive 100C of the present embodiment, it is possible to the fully property of application switch element With the performance of motor M, and reliability can be made to improve.
It addition, by carrying out process based on element short protected location 12 in the case of staying out of microcomputer, It is thus possible to make the driving of inverter circuit 11 stop from overcurrent being detected in a few μ sec.Thereby, it is possible to reliably prevent The switch element that only inverter circuit 11 possesses is destroyed due to overcurrent.
" variation "
Above, illustrate the motor drive that the present invention relates to according to each embodiment, but the enforcement of the present invention Mode is not limited to these and records, it is possible to carry out various changes etc..
Such as, in the 3rd above-mentioned embodiment and the 4th embodiment, although opened by component temperature detector 60 detection Close the temperature of element, but be not restricted to that this.I.e., also can possess merit with replacing component temperature detector 60 (with reference to Fig. 7) The surface temperature of rate module 10 (with reference to Fig. 7) carries out the temperature of power module detector unit (not shown) detected, thus indirectly The temperature of detection switch element.
In this case, protect with component temperature by the surface temperature of the power model 10 including inverter circuit 11 It is relevant that relevant between threshold value replaces between the temperature of switch element and component temperature protection threshold value.
I.e., inverter control unit 40 is corresponding to setting from the temperature of above-mentioned temperature of power module detector unit input Component temperature protection threshold value, and make the driving of switch element stop in the case of motor current exceedes component temperature protection threshold value Only.
Thus, even if also can reliably carry out the temperature protection of switch element when using power model 10, from And the extraction structure of the installation constitution of temperature detector (temperature of power module detector unit) and holding wire becomes simple, it is possible to subtract Little manufacturing cost.
Alternatively, it is also possible to replace component temperature detector unit (with reference to Fig. 7) and possess being equipped with inverter circuit 11 The surface temperature of substrate (not shown) carries out the substrate temperature detector unit (not shown) detected.Thus detection switch is first indirectly The temperature of part.
In this case, inverter control unit 40 is corresponding to coming from the temperature of above-mentioned substrate temperature detector unit input Set component temperature protection threshold value, and make driving of switch element in the case of motor current exceedes component temperature protection threshold value Dynamic stopping.
Thus, even if also can reliably carry out the temperature protection of element when using substrate temperature detector unit, Thus the extraction of the installation constitution of temperature detector and holding wire structure becomes simple, it is possible to reduce manufacturing cost.
It addition, also may replace component temperature detector 60 (with reference to Fig. 7) and possess the heat radiation to cooling inverter circuit 11 The temperature of sheet (not shown) carries out the heatsink temperature detector unit (not shown) detected, thus indirectly detects switch element Temperature.
In this case, inverter control unit 40 comes according to the temperature from above-mentioned heatsink temperature detector unit input Set component temperature protection threshold value, and make switch element in the case of motor current exceedes described component temperature protection threshold value Driving stop.
It addition, in the respective embodiments described above, illustrate all IGBT's of switch element that inverter circuit 11 has Situation, but be not restricted to that this.
I.e., the switch element also inverter circuit 11 can being had at least one as MOSFET (Metal-Oxide- Semiconductor Field-Effect Transistor), and temperature based on this MOSFET set and component temperature protect Protect being correlated with between threshold value.
Wherein, about MOSFET, (i.e., the heat that produce) if electric current increases, is then lost than IGBT big.Especially, Even if there is the MOSFET that superjunction (super junction) constructs among MOSFET, in the case of current value is little also it is High efficiency, but owing to if current value becomes big, loss is big, thus is easily caused thermal runaway.
Therefore, component temperature detector 60 detect the temperature of the switch element of MOSFET type, component temperature protect Threshold value configuration part 47 sets the component temperature protection threshold value corresponding with this temperature.Thereby, it is possible to reliably carry out switch element Temperature protection (including the thermal runaway preventing MOSFET), and the operation of efficiency can be carried out when usual.
It addition, in the 2nd above-mentioned embodiment and the 4th embodiment, although by electromotor winding temperature detector 50 Detect the winding temperature of motor M, but be not restricted to that this.I.e., also can possess the compressor driven by motor M (not scheme Show) and replace electromotor winding temperature detector 50 (Fig. 4 reference), by the temperature of the gabarit of this compressor (not shown) is entered The gabarit temperature detecting unit (not shown) of row detection detects the winding temperature of motor M indirectly.
I.e., with the gabarit temperature of compressor and the relevant winding temperature replacing motor M subtracted between magnetic protection threshold value To subtract magnetic protection threshold value between relevant.
In this case, inverter control unit 40 is corresponding to coming from the temperature of above-mentioned gabarit temperature detecting unit input Setting subtracts magnetic protection threshold value, and makes the driving of switch element stop in the case of motor current exceedes and subtracts magnetic protection threshold value.
Thus, the relevant motor that carries out that gabarit temperature based on compressor subtracts to motor between magnetic protection threshold value subtracts Magnetic is protected, it is possible to the magnetic that subtracts suitably carrying out motor M is protected.It addition, than the inside at the compressor becoming high pressure The situation of temperature detector is set, the installation constitution of temperature detector (gabarit temperature detecting unit) and the extraction structure of holding wire Become simple, it is possible to lower manufacturing cost.
It is, therefore, possible to provide the fluid compression system subtracting magnetic of the permanent magnet that motor M possessed can suitably be prevented System.
It addition, also may replace above-mentioned electromotor winding temperature detector 50 (with reference to Fig. 4) and by driving by motor M The discharge pipe arrangement temperature detecting unit that the temperature of the discharge pipe arrangement (not shown) of dynamic compressor (not shown) carries out detecting (is not schemed Show) indirectly detect the winding temperature of motor M.
In this case, inverter control unit 40 is corresponding to the temperature from above-mentioned discharge pipe arrangement temperature detecting unit input Degree sets and subtracts magnetic protection threshold value, and makes driving of switch element in the case of subtracting magnetic protection threshold value at motor current described in exceeding Dynamic stopping.
Thereby, it is possible to the magnetic that subtracts reliably carrying out motor M is protected, and temperature detector (discharge pipe arrangement temperature detection Unit) installation constitution and holding wire extraction structure become simple, it is possible to reduce manufacturing cost.
It addition, it is defeated to may be based on the gabarit temperature detecting unit (not shown) from detecting the gabarit temperature of compressor The gabarit temperature of the compressor entered and the current detection value from amperometric 20 input, estimate the winding temperature of motor M Degree.
The winding temperature of motor M is due to the heating (generator loss) flowed into electric current, and becomes than compressor The state that gabarit temperature is the highest.Therefore, using the current detection value that inputs from amperometric 20 as parameter, motor is revised The winding temperature of M is high to what degree relative to the gabarit temperature of compressor.
In this case, inverter control unit 40 based on the gabarit temperature inputted from gabarit temperature detecting unit and From the current value of amperometric 20 input, calculate heat, the i.e. generator loss produced by motor M, and corresponding to institute The described generator loss calculated is to estimate the winding temperature of motor M.I.e., with the current detecting inputted from amperometric 20 Value is as a parameter to revise the winding temperature of motor M.
And, inverter control unit 40 correspond to deduced electromotor winding temperature set subtract magnetic protection threshold Value, and make the driving of switch element stop in the case of motor current exceedes and subtracts magnetic protection threshold value.
Thereby, it is possible to accurately reproduce motor M winding temperature, can extend motor M can range of operation, and Can the most reliably carry out motor M subtracts magnetic protection.
It addition, may be based on from the discharge pipe arrangement temperature detecting unit that the discharge pipe arrangement temperature of compressor is detected The discharge pipe arrangement temperature of the compressor that (not shown) inputs and the current detection value from amperometric 20 input, estimate The winding temperature of motor M.In this case, in the same manner as above-mentioned situation, with the current detecting inputted from amperometric 20 Value is as a parameter to revise the winding temperature of motor M.
Additionally, the process of inverter control unit 40 is as above-mentioned situation, so the description thereof will be omitted.
It addition, in above-mentioned each embodiment and variation, motor M is possible with employing the direct current of permanent magnet Brushless motor.Further, compressor (not shown) can be as the compressor of the altitude chamber driven by this DC Brushless Motor.
So, by DC Brushless Motor being used as the motor M of compressor such that it is able to realize higher energy Efficiency.Can suitably protect the switch element of inverter circuit 11 furthermore it is possible to provide and can be reliably prevented electronic The fluid compression system subtracting magnetic of machine M.
It addition, be used as the compressor of low-pressure chamber that driven by DC Brushless Motor as compressor (not shown) and Replace above-mentioned electromotor winding temperature detector 50 (with reference to Fig. 4), it is possible to use be arranged at the knot of outdoor equipment (not shown) Frost detector unit (not shown) and be arranged at the indoor temperature detector unit (not shown) of indoor equipment (not shown) and carry out Replace.
In this case, when heating runs, indirectly detected by the frosting detector unit being arranged at outdoor equipment The winding temperature of motor M.Afterwards, inverter control unit 40 sets according to the temperature inputted from frosting detector unit and subtracts magnetic Protection threshold value, and make the driving of switch element stop in the case of motor current exceedes and subtracts magnetic protection threshold value.
On the other hand, when refrigeration runs, indirectly examined by the indoor temperature detector unit being arranged at indoor equipment Survey the winding temperature of motor M.Afterwards, inverter control unit 40 is corresponding to coming from the temperature of indoor temperature detector unit input Setting subtracts magnetic protection threshold value, and makes the driving of switch element stop in the case of motor current exceedes and subtracts magnetic protection threshold value.
I.e., inverter control unit 40 utilizes the heat between the winding temperature of motor M and the frosting temperature of heat exchanger Dependency relation or the winding temperature of motor M and indoor temperature between heat dependency relation, estimate winding temperature.
Thereby, it is possible to be reliably prevented the magnetic that subtracts of motor M, and temperature detector (frosting detector unit and Indoor Temperature Degree detector unit) installation constitution and holding wire extraction structure become simple, it is possible to reduce manufacturing cost.
It addition, air conditioner (not shown) also can possess the fluid compression system crossed in described above.In this case, The compressor possessing above-mentioned motor M is arranged at outdoor equipment.
Thus, it is possible to provide the magnetic that subtracts of the protection and motor M that can reliably carry out switch element to protect and reliability High air conditioner.Even if it addition, this air conditioner requires bigger energy under the big low temperature of air conditioner load or hot environment In the case of power, also can play this air conditioning capacity to greatest extent.
It addition, in above-mentioned each embodiment, illustrate to use permanent-magnet type synchronous motor as motor M Situation, but be not restricted to that this.I.e., the respective embodiments described above can be suitably used for coiled pipe type synchronous motor, magnetic resistance electricity too Other synchronous motors of motivation etc..
It addition, in above-mentioned each embodiment, illustrate the alternating voltage that inputs from alternating current power supply 200 by transducer Circuit 300 is transformed into DC voltage and then is transformed into by driving the switch element of inverter circuit 11 by this DC voltage The situation of the alternating voltage of regulation, but be not restricted to that this.For example, it is also possible to from reservoir (DC source: not shown) to inverse Become device circuit 11 input direct voltage.
It addition, be used as active circuit (not shown) to control DC voltage actively.

Claims (19)

1. a motor drive, possesses: has switch element, and will become from the DC voltage conversion of DC supply input The inverter circuit of alternating voltage；And to supplying the current detecting list detected to the DC current of described inverter circuit Unit, and drive motor by the alternating electromotive force exported from described inverter circuit according to described conversion,
Described motor drive is characterised by possessing:
Control unit, it controls the on/off of described switch element；And
Element short protected location, it exceedes for preventing described inverter at the current value inputted from described current detecting unit In the case of the short-circuit protection threshold value of the short circuit in circuit, stop instruction signal is exported to inverter driving circuit, make described The driving of switch element stops,
Described control unit estimates according to the current value inputted from described current detecting unit and flows into the electronic of described motor Electromechanics flows, and the magnetic that subtracts exceeded with the temperature protection of described switch element and/or described motor at this motor current is protected In the case of other relevant current thresholds, perform to make the process driving stopping of described switch element,
The current value detected by described current detecting unit is imported into described element short protected location, and is imported into Carry out in the microcomputer of the calculation process relevant to described control unit,
The process of described element short protected location is performed in the case of staying out of described microcomputer,
The process of described control unit is performed in the case of getting involved described microcomputer,
Detect that the current value of described input exceedes described short-circuit protection threshold value and plays to institute from described element short protected location The time till inverter driving circuit exports described stop instruction signal of stating is the hardware electricity staying out of described microcomputer Required time under road.
Motor drive the most according to claim 1, it is characterised in that
Described motor drive possesses winding temperature detector unit, and this winding temperature detector unit detects directly or indirectly The winding temperature of described motor,
What other current thresholds described included the subtracting magnetic characteristic of magnet having based on described motor and set subtracts magnetic protection threshold Value,
Described subtract magnetic protection threshold value temperature characterisitic have described short-circuit protection threshold value be more than described in subtract magnetic protection threshold value temperature Region,
Described control unit subtracts magnetic protection described in setting from the winding temperature of described winding temperature detector unit input Threshold value, and in the case of subtracting magnetic protection threshold value at described motor current described in exceeding, make the driving of described switch element stop.
Motor drive the most according to claim 1, it is characterised in that
Described motor drive possesses component temperature detector unit, and this component temperature detector unit detects directly or indirectly The temperature of described switch element,
The component temperature protection threshold value that other current thresholds described include element characteristic based on described switch element and set,
The temperature characterisitic of described component temperature protection threshold value has described short-circuit protection threshold value and protects threshold more than described component temperature The temperature province of value,
Described control unit is corresponding to setting institute from the temperature of the described switch element of described component temperature detector unit input State component temperature protection threshold value, and in the case of described motor current exceedes described component temperature protection threshold value, make described The driving of switch element stops.
Motor drive the most according to claim 1, it is characterised in that
Described motor drive possesses:
Winding temperature detector unit, it detects the winding temperature of described motor directly or indirectly；And
Component temperature detector unit, it detects the temperature of described switch element directly or indirectly,
What other current thresholds described included the subtracting magnetic characteristic of magnet having based on described motor and set subtracts magnetic protection threshold Value and element characteristic based on described switch element and the component temperature protection threshold value that sets,
Described subtract magnetic protection threshold value temperature characterisitic have described short-circuit protection threshold value be more than described in subtract magnetic protection threshold value temperature Region,
The temperature characterisitic of described component temperature protection threshold value has described short-circuit protection threshold value and protects threshold more than described component temperature The temperature province of value,
Described control unit subtracts magnetic protection described in setting from the winding temperature of described winding temperature detector unit input Threshold value, and corresponding to setting described component temperature from the temperature of the described switch element of described component temperature detector unit input Protection threshold value, and subtract described in exceeding at described motor current among magnetic protection threshold value and described component temperature protection threshold value In the case of at least one party, the driving of described switch element is made to stop.
5. according to the motor drive described in claim 2 or 4, it is characterised in that
The magnet that described motor has have become low temperature along with the temperature of this magnet and subtract that magnetoelectricity flow valuve diminishes to subtract magnetic special Property,
Described control unit is set to based on described the subtracting magnetic characteristic of magnet: along with inputting from described winding temperature detector unit Described winding temperature become low temperature and subtract magnetic protection threshold value described in making and diminish.
Motor drive the most according to claim 5, it is characterised in that
The described magnet that described motor has is ferrimagnet.
7. according to the motor drive described in claim 2 or 4, it is characterised in that
The magnet that described motor has have become high temperature along with the temperature of this magnet and subtract that magnetoelectricity flow valuve diminishes to subtract magnetic special Property,
Described control unit is set to based on described the subtracting magnetic characteristic of magnet: along with inputting from described winding temperature detector unit Described winding temperature become high temperature and subtract magnetic protection threshold value described in making and diminish.
Motor drive the most according to claim 7, it is characterised in that
The described magnet that described motor has is rare earth magnet.
9. according to the motor drive described in claim 3 or 4, it is characterised in that
The described component temperature detector unit of the temperature indirectly detecting described switch element is to including described inverter circuit Surface temperature at interior power model carries out the temperature of power module detector unit detected,
Described control unit is corresponding to setting described component temperature from the temperature of described temperature of power module detector unit input Protection threshold value, and in the case of described motor current exceedes described component temperature protection threshold value, make described switch element Drive and stop.
10. according to the motor drive described in claim 3 or 4, it is characterised in that
The described component temperature detector unit of the temperature indirectly detecting described switch element is to being equipped with described inverter electricity The surface temperature of the substrate on road carries out the substrate temperature detector unit detected,
Described control unit is corresponding to setting the protection of described component temperature from the temperature of described substrate temperature detector unit input Threshold value, and in the case of described motor current exceedes described component temperature protection threshold value, make the driving of described switch element Stop.
11. according to the motor drive described in claim 3 or 4, it is characterised in that
The described component temperature detector unit of the temperature indirectly detecting described switch element is to cooling down described inverter circuit The temperature of fin carry out the heatsink temperature detector unit that detects,
Described control unit is protected corresponding to setting described component temperature from the temperature of described heatsink temperature detector unit input Protect threshold value, and in the case of described motor current exceedes described component temperature protection threshold value, make driving of described switch element Dynamic stopping.
12. according to the motor drive described in claim 3 or 4, it is characterised in that
At least one among the described switch element that described inverter circuit has is MOSFET,
Described component temperature detector unit detects the temperature of described MOSFET and exports to described control unit,
Described control unit is corresponding to setting described from the temperature of the described MOSFET of described component temperature detector unit input Component temperature protection threshold value.
13. 1 kinds of fluid compression systems, it is characterised in that possess:
Motor drive described in claim 2 or 4；And
The compressor being driven by described motor,
The described winding temperature detector unit of the winding temperature indirectly detecting described motor is the gabarit to described compressor Temperature carries out the gabarit temperature detecting unit detected,
Described control unit subtracts magnetic protection threshold value described in setting from the temperature of described gabarit temperature detecting unit input, And in the case of subtracting magnetic protection threshold value at described motor current described in exceeding, make the driving of described switch element stop.
14. fluid compression systems according to claim 13, it is characterised in that
Described motor is the use of the DC Brushless Motor of permanent magnet,
Described compressor is the compressor of the altitude chamber driven by described DC Brushless Motor.
15. 1 kinds of fluid compression systems, it is characterised in that possess:
Motor drive described in claim 2 or 4；And
The compressor being driven by described motor,
The described winding temperature detector unit of the winding temperature indirectly detecting described motor is the discharge to described compressor Pipe arrangement temperature carries out the discharge pipe arrangement temperature detecting unit detected,
Described control unit subtracts magnetic protection described in setting from the temperature of described discharge pipe arrangement temperature detecting unit input Threshold value, and in the case of subtracting magnetic protection threshold value at described motor current described in exceeding, make the driving of described switch element stop.
16. 1 kinds of fluid compression systems, it is characterised in that possess:
Motor drive described in claim 2 or 4；And
The compressor being driven by described motor,
The described winding temperature detector unit of the winding temperature indirectly detecting described motor is the gabarit to described compressor Temperature carries out the gabarit temperature detecting unit that detects and the DC current to supply to described inverter circuit detects Described current detecting unit,
Described control unit,
Based on the temperature inputted from described gabarit temperature detecting unit and the current value inputted from described current detecting unit Calculate heat, the i.e. generator loss produced by described motor,
The described generator loss corresponding to be calculated to estimate the winding temperature of described motor,
The described winding temperature corresponding to be estimated subtracts magnetic protection threshold value described in setting,
The driving of described switch element is made to stop in the case of subtracting magnetic protection threshold value at described motor current described in exceeding.
17. 1 kinds of fluid compression systems, it is characterised in that possess:
Motor drive described in claim 2 or 4；And
The compressor being driven by described motor,
The described winding temperature detector unit of the winding temperature indirectly detecting described motor is the discharge to described compressor Pipe arrangement temperature carries out the discharge pipe arrangement temperature detecting unit that detects and flows to the unidirectional current of supply to described inverter circuit The described current detecting unit of row detection,
Described control unit,
Based on the temperature inputted from described discharge pipe arrangement temperature detecting unit and the electric current inputted from described current detecting unit Value calculates heat, the i.e. generator loss produced by described motor,
The described generator loss corresponding to be calculated to estimate the winding temperature of described motor,
The described winding temperature corresponding to be estimated subtracts magnetic protection threshold value described in setting,
The driving of described switch element is made to stop in the case of subtracting magnetic protection threshold value at described motor current described in exceeding.
18. 1 kinds of fluid compression systems, it is characterised in that possess:
Motor drive described in claim 2 or 4；And
By the compressor of the low-pressure chamber of described motor-driven,
Described motor is the use of the DC Brushless Motor of permanent magnet,
When heating runs, indirectly detected the winding of described motor by the frosting detector unit being arranged at outdoor equipment Temperature,
When refrigeration runs, indirectly detect described motor by the indoor temperature detector unit being arranged at indoor equipment Winding temperature,
Described control unit sets corresponding to the temperature inputted from described frosting detector unit or described indoor temperature detector unit Subtract magnetic protection threshold value described in Ding, and make described switch unit in the case of subtracting magnetic protection threshold value described in exceeding at described motor current The driving of part stops.
19. 1 kinds of air conditioners, it is characterised in that possess the fluid compression system described in claim 13.
CN201210303481.4A 2012-03-15 2012-08-23 Motor drive, fluid compression system and air conditioner Active CN103312262B (en)

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KR101398524B1 (en) 2014-05-27

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