WO2011047617A1

WO2011047617A1 - Self balance connection rod mechanism and bed using the same

Info

Publication number: WO2011047617A1
Application number: PCT/CN2010/077867
Authority: WO
Inventors: 陈军
Original assignee: Chen Jun
Priority date: 2009-10-22
Filing date: 2010-10-19
Publication date: 2011-04-28
Also published as: CN101711632A; CN101711632B

Abstract

A self balance connection rod mechanism includes a fixed support (3), the first rotation shaft (1), the second rotation shaft (2), the first swing arm (11), the second swing arm (21), and a movable connection rod (4). The first swing arm (11) can rotate around the first rotation shaft (1), and the second swing arm (21) can rotate around the second rotation shaft (2). The first rotation shaft (1) is parallel to the second rotation shaft (2), and the two rotation shafts are fixed on the fixed support (3). Two ends of the movable connection rod (4) are hinged to the first swing arm (11) and the second swing arm (21) respectively. The distance from the first rotation shaft (1) to the connection point between the movable connection rod (4) and the first swing arm (11) is equal to the distance from the second rotation shaft (2) to the connection point between the movable connection rod (4) and the second swing arm (21). A gravity block is arranged in the inner side end of the first swing arm (11). The self balance connection rod mechanism also includes an automatic detection module, an electronic control module (7), an electromagnetic module (52), a power device (16) and a gravity regulation block (13).

Description

Self-balancing linkage mechanism and bed using the same

TECHNICAL FIELD The present invention relates to the field of furniture technology, and in particular to a self-balancing linkage mechanism and a bed to which the mechanism is applied.

Said technical background book

With the acceleration of the pace of modern life, people are facing increasing pressure on life and work, which leads to insomnia caused by mental and environmental reasons. Now, most people with insomnia usually use some drugs to suppress insomnia. Thereby improving the quality of sleep, but taking these drugs regularly, more physical damage.

At this stage, there are some swinging beds, which move the user through the activities of the bed, which helps the insomnia to fall asleep quickly. The Chinese patent No. CN2565330 discloses a multifunctional swinging bed, which is driven by a motor. The swing of the bed body makes the insomnia person fall asleep better, effectively inhibiting insomnia. Although the above patent solves the problem that people are unable to fall asleep when insomnia, in the course of use, the motor needs to work continuously under the power-on state, and it requires a large amount of electric energy, and its use cost is high.

In addition, the existing treatment of insomnia beds cannot achieve the balance of the force due to the internal structure of the bed. Specifically, when a point on the bed is subjected to downward pressure, the pressure cannot be uniformly formed on the bed. The uniform load underneath, and to some extent, the local oscillation of its swing. SUMMARY OF THE INVENTION In view of the deficiencies of the prior art, one of the objects of the present invention is to provide a self-balancing linkage mechanism, which greatly saves the power consumed by its operation through special design, and at the same time, the point force is formed downward. No load. Another object of the present invention is to provide a bed using the above self-balancing linkage mechanism. To achieve one of the above objectives, the present invention adopts the following technical solutions:

Book

A self-balancing linkage mechanism includes a fixed bracket, a first rotating shaft, a second rotating shaft, a first swing arm, a second swing arm, and a movable link; the first swing arm is rotatable around the first Rotating the shaft, the second swing arm is rotatable about the second rotating shaft; the first rotating shaft is parallel to the second rotating shaft, and both are mounted on the fixing bracket; Two ends of the rod are respectively hingedly connected to the first swing arm and the second swing arm, and a distance between the first rotating shaft and a connecting point of the movable link and the first swing arm, and the first a distance between the two rotating shafts and the connecting point of the movable connecting rod and the second swing arm is equal; a gravity block is disposed at an inner end of the first swing arm; the self-balancing linkage mechanism further comprises an automatic detecting module and an electric Control module, electromagnetic module, power unit, gravity adjustment block. The movable link includes a first movable link at a middle portion thereof, a second link at two ends thereof, a second movable link of the first movable link, and an intermediate portion of the first movable link Attached to the fixed bracket hinge. The power unit is a motor mounted on an outer end of the first swing arm; a sliding rod is further disposed between the two ends of the first swing arm, and the gravity adjusting block is set on the sliding rod a power rod of the motor is mounted with a screw rod and drives the screw rod to rotate, The rotation of the screw rod drives the gravity adjusting block to slide between the two ends of the first swing arm along the sliding rod. The upper portion of the self-balancing linkage further includes an upper frame, the bottom four-end corner of the upper frame is provided with a combined supporting device, and the combined supporting device and the outer side of the first swing arm and the second swing arm An end hinge connection; the combined support device includes a follower bar, a support frame, and a carrier frame; the upper end of the follower bar is hingedly connected to an outer end of the first swing arm or the second swing arm, a lower bottom end is hingedly connected to the lower end of the support frame, and the book is

The upper end of the support frame is fixedly coupled to the lower surface of the carrier frame. The electromagnetic module includes a connecting rod and two electromagnetic poles; the connecting rod is hingedly connected to the fixing bracket at one end, and the other end is hingedly connected to the upper end of the supporting frame connected to one end of the second swing arm; The electronic control module is connected by a circuit, and the electronic control module is respectively connected to the two electromagnetic poles and the motor through a circuit. In order to achieve the above two objectives, the present invention adopts the following technical solutions:

A bed adopting the self-balancing linkage mechanism, comprising a bed board, a bed circumference, a headboard and a bed bottom frame, wherein the bed frame comprises a fixing bracket, a first rotating shaft, a second rotating shaft, and a first swing arm, a second swing arm, and a movable link; the first swing arm is rotatable about the first rotation axis, and the second swing arm is rotatable about the second rotation axis; the first rotation axis is The second rotating shaft is parallel, and both of them are mounted on the fixing bracket; two ends of the movable connecting rod are respectively hingedly connected to the first swing arm and the second swing arm, and the first rotation a distance between the shaft and the connecting point of the movable link and the first swing arm, and a distance between the second rotating shaft and the connecting point of the movable link and the second swing arm; at the first a gravity block is disposed at an inner end of the swing arm; the self-balancing link mechanism further includes an automatic detection mode Block, electronic control module, electromagnetic module, power unit, gravity adjustment block. The movable link includes a first movable link at a middle portion thereof, a second link at two ends thereof, a second movable link of the first movable link, and an intermediate portion of the first movable link Attached to the fixed bracket hinge. The power unit is a motor mounted on an outer end of the first swing arm; a sliding rod is further disposed between the two ends of the first swing arm, and the gravity adjusting block is set on the sliding rod The power end of the motor is mounted with a screw rod and drives the screw to rotate, the book

The rotation of the screw rod drives the gravity adjusting block to slide between the two ends of the first swing arm along the sliding rod. The upper portion of the self-balancing linkage further includes an upper frame, the bottom four-end corner of the upper frame is provided with a combined supporting device, and the combined supporting device and the outer side of the first swing arm and the second swing arm An end hinge connection; the combined support device includes a follower bar, a support frame, and a carrier frame; the upper end of the follower bar is hingedly connected to the outer end of the first swing arm or the second swing arm, and the lower end thereof The bottom end is hingedly connected to the lower end of the support frame, and the upper end of the support frame is fixedly coupled to the lower surface of the carrier frame. The electromagnetic module includes a connecting rod and two electromagnetic poles; the connecting rod is hingedly connected to the fixing bracket at one end, and the other end is hingedly connected to the upper end of the supporting frame connected to one end of the second swing arm; The electronic control module is connected by a circuit, and the electronic control module is respectively connected to the two electromagnetic poles and the motor through a circuit. The utility model has the beneficial effects that the self-balancing linkage mechanism described in the invention adopts the above structure, the detecting device detects the pressure on the upper surface of the mechanism, and then sends a signal to the electronic control module, and controls the motor through the electronic control module. Turn the gravity adjustment block on and off The position of the entire mechanism is balanced; and, after reaching the balance, the operation and closing of the electromagnetic module can be controlled by the electronic control module, and the upper part of the entire mechanism can be moved up and down without opening the motor, thereby greatly saving The electric energy is avoided at the same time; the self-balancing mechanism can convert the local force at a certain point on the upper part into a downward uniform load to ensure uniform force; the bed using the self-balancing mechanism can detect the user The weight, self-adjusting balance, and can maintain the balance of the force of the bed. book

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of a self-balancing link mechanism of the present invention; FIG. 2 is a B-direction view of FIG. 1; FIG. 3 is an end view of FIG. Fig. 4 is a schematic view showing another working state of the structure shown in Fig. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be further described with reference to the accompanying drawings and specific embodiments. The bed of the present invention can be moved up and down relative to the bottom of the bed to achieve the purpose of promoting insomnia to fall asleep as soon as possible; The self-balancing linkage mechanism shown in FIG. 1 and FIG. 2, through the self-balancing linkage mechanism, can make the insomnia person obtain a more comfortable feeling, thereby achieving the effect of suppressing insomnia; wherein the X-axis is the self-balancing mechanism In the length direction, the Y-axis is the width direction of the self-balancing mechanism. The self-balancing linkage mechanism shown in Figures 1 and 2 includes a fixing function at the bottom thereof. The fixing bracket 3 is mounted on the fixing bracket 3 with a rotating shaft 1 and a rotating shaft 2 along the width direction of the self-balancing mechanism. The two rotating shafts are mounted parallel to each other on the upper portion of the fixing bracket 3, and the rotating shaft 1 is mounted with a main assembly. The swing arm 11 is rotatable about the rotating shaft 1, and the auxiliary swing arm 21 is mounted on the rotating shaft 2, which is rotatable about the rotating shaft 2; in order to maintain the balance of the force in the width direction of the entire mechanism, the main swing arm 1 1 includes Two parallel swing arms, the two parallel swing arm pairs

The end portions are connected to each other by the fixing rods 12, 17 in the width direction of the self-balancing mechanism, thereby ensuring the synchronism of the main swing arm 11. Of course, the auxiliary book swing arm 21 has the same structure as the main swing arm 11; A gravity block is mounted on the fixed rod 12. A movable link 4 is further connected between the main swing arm 11 and the auxiliary swing arm 21, and the movable link 4 includes a main movable link 41 at an intermediate portion, and a secondary movable link hingedly connected to both ends of the main movable link 41. The rod 42 is rotatably connected to the fixed bracket 3 at the intermediate portion of the main movable connecting rod 41, and the auxiliary movable links 42 at both ends are hingedly connected to the one end of the main swing arm 1 1 and the auxiliary pendulum respectively in the vertical direction. The arm 21 is near the inner end, and at the same time, according to general mechanical theory, the inventors have a distance dl (between the hinge connecting point of the auxiliary movable link 42 and the main swing arm 11 of the main swing arm 11 and the rotating shaft 1) The distance between the hinge connection point and the rotation axis 2 of the auxiliary movable link 42 and the auxiliary swing arm 21 near the auxiliary swing arm 21 is set equal, so that the above main swing arm can be better realized. 11. Continuous operation of the auxiliary swing arm 21 and the connecting rod 4. The upper part of the self-balancing mechanism is further provided with an upper frame 6 . As shown in FIG. 3 , a support frame 61 is respectively mounted on the bottoms of the four end corners of the upper frame 6 , and a follower rod 62 and a follower rod are mounted in the support frame 61 . 62 is disposed in a vertical direction, the bottom hinge is connected to the bottom of the support frame 61, and the top thereof is hinged to the outer end of the main swing arm 11 or the auxiliary swing arm 21. Connected to the top of the support frame 61 as a load-bearing frame, the bottom bottom surface of the end frame of the load-bearing frame is fixedly connected with the top of the support frame 61; when the upper surface of the upper frame 6 is subjected to a relatively concentrated downward load, according to general mechanical common sense The downward concentrated load can form a downward uniform load by the self-balancing mechanism, maintaining the balance of the entire mechanism in the horizontal direction.

Say

An electromagnetic module is further mounted on the self-balancing mechanism, and the electromagnetic module includes a connecting rod 51 and two electromagnetic poles 52. The connecting rod 51 is disposed on one side of the entire device according to the length direction of the self-balancing book mechanism, and is adjacent to one end of the rotating shaft 1. The hinge is connected to the fixing bracket 3, and the other end is hingedly connected to the supporting frame 61 connected to the auxiliary swing arm 21. The two electromagnetic poles 52 are respectively fixed on the lower surface of the connecting rod 51 and the fixing bracket 3, and the auxiliary swing arm 21 is The rotation causes the upper and lower movements of the support frame 61 to be brought closer to and separated from the two electromagnetic poles 52. The electromagnetic pole 52 in the present invention is controlled by an electronic control module, which is an electric control box 7 mounted on the fixed bracket 3, which is connected to the electromagnetic pole 52 through a circuit, and at the same time, the electric control box 7 is connected to the motor 16 through a circuit. . In order to enable the above-described self-balancing mechanism to achieve a higher degree of automation, the inventors have also configured a detecting device including a signal receiver 81 and a detecting head 82. The signal receiver 81 is fixedly mounted on the fixed bracket 3 and passed through the circuit and the electric power. The control box 7 is connected, and the detecting head 82 is fixed on the supporting frame 61. The upper and lower movements of the supporting frame 61 cause different displacement differences between the detecting head 82 and the signal receiver 81 according to time, and then pass through the signal receiver. 81 transmits the signal to the electric control box 7 to control the closing or opening of the circuits of the two electromagnetic poles 52. It should be noted here that in the above structure, it can be based on the bearing range of the device. The weight of the gravity block fixedly mounted on the fixed rod 12 is adjusted, or the fixed rod 12 is directly made of a heavier material. In any way, a large downward gravity is generated at the fixed rod 12 in the device. , a downward pressure is generated on the inner end of the main swing arm 11 and moved downward, so that the outer end of the main swing arm 11 can be lifted, and the support frame 61 connected to the outer end of the main swing arm 1 1 can be lifted, and at the same time The lifting of the outer end of the main swing arm 11 drives the rotation of the movable link 4, and the movable link 4 further drives the inner end of the auxiliary swing arm 21 to rotate downward, so that the outer end of the auxiliary swing arm 21 is lifted upward, thereby driving Connected to the outside of the book

The support frame 61 of the end is moved upwards, so that the support frames 61 of the four end corners are simultaneously moved upward; when the fixed rod 12 is moved to the most position, the support frame 61 is moved to the highest position, and the upwardly driven link 51 is rotated to the highest position. The position is such that the two electromagnetic poles 52 are at the maximum displacement of their distances, and the entire self-balancing mechanism is in the state shown in FIG. 1. The detecting device detects the up-and-down positional relationship between the signal receiver 81 and the detecting head 82 in time, and converts it into The signal is sent to the electric control box 7 through the circuit. The electric control box 7 controls the circuit of the electromagnetic pole 52 to be opened, and the two electromagnetic poles 52 are generated to generate mutual attraction force. At this time, a downward attraction force is generated to link the connecting rod 51. Pulling down, and driving the support frame 61 with the hinges of the two sides 51 downward, the support frame 61 drives the outer end of the auxiliary swing arm 21 to rotate downward, so that the inner end thereof is intended to rotate, and the main swing is driven by the movable link 4. The inner end of the arm 11 rotates, thereby driving the outer end of the main swing arm 11 to rotate downward, so that the support frame 61 connected thereto moves downward, in the process, due to the rotation of the main swing arm 11 The gravity block connected to the fixed rod 12 is lifted upwards. When the support frame 61 is moved downward to the lowest position, the main swing arm 11 drives the fixed rod 12 and the gravity block to move to the highest position. The whole device is as shown in FIG. At this time, the detecting means detects the up and down positional relationship between the signal receiver 81 and the detecting head 82, The signal is converted into a signal and sent to the electric control box 7 through the circuit. After receiving the signal, the electric control box 7 closes the circuit of the electromagnetic pole 52, and the attraction between the two electromagnetic blocks disappears. Due to the gravity of the fixed rod 12 and the gravity block, So that it has a downward movement trend, and drives the main swing arm 11 to rotate, and then repeats the above process; in the above structural design, the corresponding weight, size, current supply current and other parameters can be obtained according to specific calculations, thereby making electromagnetic The attraction between the poles and the gravity of the gravity block reach a point of equilibrium, so that the frame located above the entire device can move up and down.

Book

In addition, in order to make the above structure under a certain pressure, automatic adjustment can be performed to achieve the above balance, so that the entire upper frame can be moved up and down as described above, and two slidings are fixedly mounted between the fixed rod 12 and the fixed rod 17. The rod 14 and the screw rod 15, the gravity adjusting block 13 and the two sliding rods 14 and the screw rod 15 are fixedly mounted on the fixing rod 17 with a power device for rotating the screw rod, wherein the invention adopts an electric motor. 16 , the motor 16 drives the rotation of the screw rod 15 , so that the gravity adjustment block 13 can be moved between the fixed rod 12 and the fixed rod 17 ; on one side of the motor 16 , a photoelectric switch is mounted on the fixed bracket 3 , the photoelectric switch It is connected to the electric control box 7 through a circuit, and its opening and closing is controlled by the electric control box , to realize the control of opening and closing the motor 16; when the upper frame 6 is subjected to downward pressure, it moves downward, and drives The linkage of the entire device causes the outer end of the main swing arm 1 1 , that is, the end of the connecting rod 12 to move downward, and the motor 16 connected to the fixed rod 12 also follows. Under the movement, the photoelectric switch detects the movement and displacement of the motor 16, and converts the signal into a signal to the electric control box 7. The electric control box 7 opens the circuit of the motor, and the motor 16 rotates to drive the rotation of the screw 15, thereby driving the gravity adjustment. Block 1 3 moves to the side close to the fixed rod 17 to match the entire loading Balanced, as the gravity adjustment block 13 moves, the main swing arm 11 is rotated, and the rotation direction is the inner end (that is, the end connecting the fixed rod 12) downward, and the outer end of the main swing arm 11 is driven upward. Rotating, and driving the motor 16 to move upward, when the motor 16 moves up to its initial position, the electronic control switch sends a signal to the electric control box 7, and the electric control box 7 cuts off the power supply circuit of the motor 16, thereby bringing the entire mechanism to an equilibrium state.

Say

Of course, the above-mentioned motor drives the screw to rotate, and the cylinder can be telescopically realized.

Drive the movement of the gravity adjustment block. Since the invention adopts the above structure, the non-stop up and down movement can be realized without using the electric motor as power, but only a small amount of electric energy is used for the electromagnetic pole to work, thereby greatly saving electric energy and reducing the use cost for the user. According to the general mechanical common sense, in the present invention, in order to enable the end portions of the main swing arm 11 and the auxiliary swing arm 21 to have a larger stroke, the swing arm has a larger angle at a position on both sides of the rotating shaft. The bed of the present invention further includes a bed panel mounted on the upper frame 6 of the self-balancing mechanism, a bed panel mounted on the periphery of the fixing bracket 3, and a headboard at one end of the bed. The up and down movement of the self-balancing mechanism located at the lower part of the bed plate drives the up and down movement of the user lying on the bed, which can eliminate the unevenness and achieve the effect of suppressing insomnia. In order to further increase such comfort, a damper spring is attached to the connection portion between the bed board and the upper frame 6. During use of the bed, the user lies on the bed, and generates a downward pressure on the upper frame 6. The self-balancing mechanism located below adjusts the balance of the entire bed for the weight of the user, so that the bed can be normally moved up and down. Exercise, giving the user a comfortable feeling. In addition, the bed of the present invention can also be controlled by a remote controller, and the remote controller can be controlled for the electric control box, and the parameters such as the amplitude of the up and down movement of the bed body, the time of moving the bed body, and the frequency of the movement of the bed body can be set, of course. The setting of these parameters is realized according to the controller in the setting electric control box. This setting can be realized by general automation common sense, and will not be explained too much here.

Say

The above self-balancing linkage mechanism can of course be applied to other furniture, such as sofas and chairs, to achieve the effect of relieving fatigue. Book

Various other changes and modifications may be made by those skilled in the art in light of the above-described technical solutions and modifications, and all such changes and modifications are intended to fall within the scope of the appended claims.

Claims

Claim

A self-balancing linkage mechanism comprising a fixed bracket, a first rotating shaft, a second rotating shaft, a first swing arm, a second swing arm, and a movable link; the first swing arm is rotatable around The first rotating shaft rotates, the second swing arm is rotatable about the second rotating shaft; the first rotating shaft is parallel to the second rotating shaft, and both of them are mounted on the fixing bracket; Two ends of the movable link are respectively hingedly connected to the first swing arm and the second swing arm, wherein the first rotating shaft and the connecting point between the movable link and the first swing arm are a distance between the second rotating shaft and the connecting point of the movable link and the second swing arm; a gravity block is disposed at an inner end of the first swing arm; the self-balancing link mechanism is further Including automatic detection module, electronic control module, electromagnetic module, power unit, gravity adjustment block.

2. The self-balancing linkage according to claim 1, wherein the movable link comprises a first movable link at a middle portion thereof, a second link at both ends thereof, the first activity a second movable link of the connecting rod; an intermediate portion of the first movable link is hingedly connected to the fixed bracket.

The self-balancing linkage mechanism according to claim 1, wherein the power device is a motor mounted on an outer end of the first swing arm; A sliding rod is further disposed, the gravity adjusting block is disposed on the sliding rod; a power rod of the motor is mounted with a screw rod and drives the screw rod to rotate, and the screw rod rotates to drive the gravity adjusting block along The slide bar slides between both ends of the first swing arm.

The self-balancing link structure according to claim 3, wherein the upper portion of the self-balancing link mechanism further comprises an upper frame, and the bottom four corners of the upper frame are provided with a combined supporting device. The combined support device is hingedly connected to the outer ends of the first swing arm and the second swing arm; the combined support device includes a follower rod, a support frame, The bearing frame of the claim; the upper end of the driven rod is hingedly connected to the outer end of the first swing arm or the second swing arm, and the lower bottom end is hingedly connected to the lower end of the support frame, the support The upper top end of the frame is fixedly coupled to the lower surface of the carrier frame.

The self-balancing linkage mechanism according to claim 4, wherein the electromagnetic module comprises a connecting rod and two electromagnetic poles; the connecting rod is hingedly connected to the fixing bracket at one end, and the other end is connected The upper end of the support frame at one end of the second swing arm is hingedly connected; the detecting module is connected to the electronic control module through a circuit, and the electronic control module is respectively connected to the two electromagnetic poles and the motor through a circuit.

A bed using the self-balancing linkage mechanism according to claim 1, comprising a bed board, a bed circumference, a headboard, and a bed frame, wherein the bed frame comprises a fixing bracket, a first rotating shaft, and a second rotation. a shaft, a first swing arm, a second swing arm, and a movable link; the first swing arm is rotatable about the first rotation axis, and the second swing arm is rotatable about the second rotation axis; The first rotating shaft is parallel to the second rotating shaft, and the two are mounted on the fixing bracket; the two ends of the movable connecting rod are respectively hinged with the first swing arm and the second swing arm a connection, wherein a distance between the first rotating shaft and a connecting point of the movable link and the first swing arm, and a connection point between the second rotating shaft and the movable link and the second swing arm The distance between the two is equal; a gravity block is disposed at an inner end of the first swing arm; the self-balancing linkage further includes an automatic detection module, an electronic control module, an electromagnetic module, a power device, and a gravity adjustment block.

The bed according to claim 6, wherein the movable link includes a first movable link at a middle portion thereof, a second link at both ends thereof, and a first movable link a movable link; an intermediate portion of the first movable link and the fixed bracket hinge The claim chain is connected.

The bed according to claim 6, wherein the power device is a motor mounted on an outer end of the first swing arm; and between the two ends of the first swing arm a sliding rod, the gravity adjusting block is set on the sliding rod; a power rod of the motor is mounted with a screw rod to drive the screw rod to rotate, and the screw rod rotates to drive the gravity adjusting block along the sliding rod Sliding between the two ends of the first swing arm.

The bed according to claim 8, wherein the upper portion of the self-balancing linkage further includes an upper frame, and the bottom four-end corner of the upper frame is provided with a combined supporting device, the combined support The device is hingedly connected to the outer ends of the first swing arm and the second swing arm; the combined support device comprises a follower rod, a support frame and a bearing frame; an upper top end of the driven rod and the first The outer end of the swing arm or the second swing arm is hingedly connected, and the lower bottom end thereof is hingedly connected to the lower end of the support frame, and the upper top end of the support frame is fixedly connected to the lower surface of the carrying frame.

The bed according to claim 9, wherein the electromagnetic module comprises a connecting rod and two electromagnetic poles; the connecting rod is hingedly connected to the fixing bracket at one end, and the other end is connected to the second pendulum The upper end of the support frame at one end of the arm is hingedly connected; the detection module is electrically connected to the electronic control module, and the electronic control module is respectively connected to the two electromagnetic poles and the motor through a circuit.