CN1076136C

CN1076136C - Multifunciton single phase ac motor

Info

Publication number: CN1076136C
Application number: CN92101773A
Authority: CN
Inventors: 杨超
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-12
Filing date: 1992-03-12
Publication date: 2001-12-12
Anticipated expiration: 2007-03-12
Also published as: CN1066939A

Abstract

The present invention relates to a multifunctional single-phase AC motor. The existing centrifugal switch is connected in parallel with a main winding and connected with a structure of a power supply after being connected in series with a starting capacitor and a starting winding. Power supply indicator lights are arranged on a proper junction box of the motor. Fuses are arranged in a main winding and a power supply loop of a starting part. Two ends of the fuses are provided with indicator lights for monitoring whether the fuses are broken. The main winding and the starting part are respectively connected in series with a current transformer. A secondary winding of the transformer is provided with an indicator light for indicating a current and a working condition. Both ends of the centrifugal switch are connected in parallel with indicator lights for monitoring the working condition of a contact point. When the work is abnormal, such as motor overload, locked rotor, fuse breaking, centrifugal switch, etc., the present invention can avoid motor windings, etc. from damaging.

Description

Multifunciton single phase ac motor

The present invention relates to and improve the single-phase AC motor that existing background technology is provided with main winding, starting winding, centrifugal switch, start capapcitor etc., belong to the motor type of electricity field.

Existing background technology with the single-phase AC motor of centrifugal switch starting by centrifugal switch, start capapcitor, after the starting windings in series, in parallel with main winding and power supply again, be the basic motive parts that are usually used in medium-sized plant equipment, at prestart, centrifugal switch is in normally off, after the energized, main winding and centrifugal switch, start capapcitor, the starting winding has electric current to pass through to start and rotate, when revolution reaches specified about 75% the time, centrifugal switch is disconnected, start capapcitor and starting winding have not had starting current, have only operating current is arranged in the main winding, existing shortcoming is as follows:

So because of the plant equipment of using single-phase motor all is middle-size and small-size not adapted control cubicle, voltmeter, ammeter, power supply indicator, special-purpose melt etc., therefore can not understand at any time with the monitoring motor end has the power supply input? whether power supply normal? the more impossible centrifugal switch that monitors at any time and understand that motor interior is damaged easily be in normally off at prestart? otherwise because of fail to start! And the damage main winding, after starting, revolution reaches at specified about 75% o'clock, in the time of can not disconnecting because of obstacle as centrifugal switch, will damage the starting winding, as the bearing of motor etc. or the mechanical load partial impairment that drags! Cause that revolution is low, centrifugal switch can not disconnect, during stall etc., can very fast damage starting winding and main winding.

Therefore, when electricity or mechanical obstacles take place, be easy to damage motor, also make the time of maintenance and equipment stopping production all long.

Purpose of the present invention:

Can do you find out the power supply input condition in appearance at motor itself? find out centrifugal switch switching, the loose contact of motor internal, find out main winding and starting winding working condition, cut off the electricity supply automatically when electricity or mechanical obstacles take place! A warning of concurrent bright dipping!

Technical measures of the present invention:

Be provided with parts such as multifunctional indicator light and privacy protection melt on the terminal box of motor itself, its circuit diagram is as shown in drawings, the meaning of literal is as follows among the figure:

The input of A, B-AC power, 220V.RD-melt or fuse.

XD1-power supply input indicator, 220V.

XD2-monitor and monitoring RD disconnected not indicator light, be called for short the molten lamp of light, 220V, operating current are few.

The main winding of DQ-motor.The current transformer of LH1-test DQ electric current.

The elementary winding of L1-LH1.The secondary winding of L2-LH1.

The current transformer of LH2-test start part.The elementary winding of L3-LH2.

The secondary winding of L4-LH2.The starting winding of QQ-motor.

The indicator light of XD4-test DQ electric current is called for short the light stream lamp.The LK-centrifugal switch.

XD5-test QQ electric current and the logical indicator light of indication LK are called for short the light stream lamp.

DX3-monitors and the on-off of monitoring centrifugal switch and the indicator light of actuating section state, 220V, and operating current is few.The C-start capapcitor.

Operation principle:

When having power supply 220V to be input to the A of motor and B end, DX1 is bright for the power supply input indicator, as the main winding of motor and starting winding nonoverload, not short circuit, not during stall, melt RD is continuous, because of being worked, indicate RD by melt RD short circuit, indicator light XD2 (light melts lamp) do not break, if power supply A by RD, DQ, L1 after, become the loop with power supply B, the operating current of DQ during by L1, the light stream lamp XD4 that is connected on L2 be bright, indicated the existing operating current of main winding DQ with light.

Power supply A level RD, LK, C, QQ, L3, the running that becomes the loop, started motor with power supply B simultaneously,, the starting current of moment, the QQ of starting during by L3, be connected on the L4 end XD5 bright, when indicating centrifugal switch LK be in starting be in normally closed, indicate the existing starting current of QQ, the work that also indicates actuating sections such as start capapcitor C is normal, is not in normal normally off when the starting because of XD3 is worked, also indicates LK by the LK short circuit.

Behind motor starting, revolution reaches at specified about 75% o'clock, because the centrifugal action of centrifugal switch, the contact of LK is disconnected, the QQ starting current of the L3 that flows through has not had, light stream lamp XD5 does not just work yet, the contact that indicates LK disconnected, illustrated that actuating section has quit work.

Simultaneously, disconnect the back at LK, establish power supply A through RD, XD3, C, QQ, L3 after, become the loop with power supply B, so few because of the operating current of XD3, be internal resistance greatly only bright a little less than the supply voltage of A and B end in the voltage landing of A and D end, disconnected with the contact that indicates LK of light, and whole start loop is in normal stand-by state, so seldom also seldom, neither can make the actuating section misoperation and also can not damage starting winding QQ etc. for a long time by the electric current of QQ and C because of the operating current of XD3.

If behind starting motor, in the time of can not disconnecting because of the contact obstacle of centrifugal switch LK, slightly long because of starting current operating current, the times a lot, that add main winding DQ of starting winding, melt RD is just disconnected (melt RD ability moment surpass rated current constantly but the time slightly long just disconnected), cut off the power supply of main winding and starting winding etc.! Can avoid or reduce the damage of starting winding QQ, use thin enamelled wire because of the starting winding belongs to transient starting work, when can be because of heat burn out when slightly long by big electric current and time, be with the modal main source of damage of motor of centrifugal switch starting.

Therefore, moment of starting motor, by monitor with eye and the terminal box of monitoring motor own on XD3 and the light indication of XD5 change, just can find out the working properly or obstacle situation of actuating sections such as centrifugal switch LK, when unusual timely powered-down, can avoid damaging melt RD etc.

As melt RD have no progeny, establish power supply A through XD2, DQ, L1 and LK, XD3, C, QQ, L3 after, become the loop with power supply B, so few because of the operating current of the molten lamp XD2 of light, be that the internal resistance of XD2 is only brighter a little less than the supply voltage that A and B hold than the many A and the voltage landing at E two ends at the molten lamp XD2 of light of the internal resistance the earth of each element of whole loops! With light to indicate melt RD disconnected.

If (neglect logical obstructed suddenly or neglect disconnected neglecting constantly), XD3 and XD5 will correspondingly send and neglect the bright flash of light that does not work suddenly when the obstacle of loose contact had taken place the contact of centrifugal switch LK! And the obstacle of loose contact has taken place in the contact that can find out the centrifugal switch LK of motor interior.

Good effect of the present invention:

1. set low-cost multifunctional indicator light on the terminal box of motor itself; the voltmeter and the ammeter that have replaced the expensive peace again of price can not load; and the indication of light is also more obvious and shatter-proof than the pin indication of table; and environment is dark more; the indication of light is obvious more; can monitor and monitor power supply at any time; main winding; the starting winding; start capapcitor; working properly or the obstacle situation of the centrifugal switch etc. of obstacle particularly takes place easily; can reduce or avoid main winding; the starting winding; the damage of centrifugal switch contact etc.; can also shorten maintenance and off-time, when motor generation electrical equipment obstacle; when mechanical overload or stall etc.; it is just disconnected to be located at the melt RD that the motor on the terminal box of motor own is complementary; can avoid winding that damages by motor etc.

Because of multifunctional light of the present invention indication and protect that used parts are very cheap, the total cost that increases whole motor seldom; but increase and improve whole motor and use the function, quality, sales competitiveness etc. of electronic products such as the supporting pump of this motor a lot, and use and operate also more convenient.

3. existing GB and international target motor increase few multifunctional light indication of power consumption of the present invention and fuse etc. back, do not need to change the structure of motor interior at all, only improve terminal box, so still can meet existing GB and the whole technical conditions of international target, new first use or replacement simple function motor are all very convenient, have also increased a lot of functions.

Claims

(1). multifunciton single phase ac motor, the motor type of genus electricity field,

The structure of existing product is: centrifugal switch, risen capacitor, the starting windings in series after, be connected in working power with main winding,

Structure of the present invention is: power supply A by melt RD and the disconnected indicator light XD2 parallel connection not of indication melt RD after, for the working power of two branch roads, a branch road is after connecting by the elementary winding L 1 of motor main winding DQ and instrument transformer LH1, becomes the loop with power supply B

Another branch road is by elementary winding L 3 backs of the indicator light XD3 parallel connection of centrifugal switch LK and indication centrifugal switch LK on-off attitude, start capapcitor C, starting winding QQ, instrument transformer LH2, becomes the loop with power supply B,

Feature of the present invention is:

Elementary winding L 3 backs of the indicator light XD3 parallel connection of one end of working power by centrifugal switch LK and indication centrifugal switch LK on-off attitude, start capapcitor C, starting winding QQ, instrument transformer LH2, be connected to the other end of working power.
(2). according to the said multifunciton single phase ac motor of claim (1), it is characterized in that: the indicator light XD5 that indication starting winding current and indication centrifugal switch LK on-state are arranged in the secondary winding L4 of instrument transformer LH2 termination.