A back electromotive force testing device for a permanent magnet motor

Abstract

The utility model discloses a kind of counter electromotive force testing devices of permanent magnet motor, belong to permanent magnet motor testing technical field;It includes: for clamping stator and driving rotor rotation test lathe, stator clamping assembly and for measuring the counter electromotive force of stator when rotor rotates test assembly;Stator clamping assembly includes stator fixed unit and stator adjusting unit, stator fixed unit includes the V-shaped base connected with test lathe and cushion block, two cushion blocks are respectively with the both sides of V-shaped base abut, form V-shaped space for constraining stator;Stator adjusting unit is set between cushion block and V-shaped base, one end of cushion block is inclined to stator, stator adjusting unit can drive cushion block relative V-shaped base oblique slip, to fine tune the relative height of stator.The utility model does not need to assemble motor, can obtain test result and repair motor.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor testing technology, and in particular to a back electromotive force testing device for permanent magnet motors. Background Technology

[0002] During the manufacturing process of permanent magnet motors, it is necessary to test the magnitude of the back electromotive force generated by the permanent magnet rotor during operation in order to evaluate the performance and efficiency of the permanent magnet rotor and determine whether the rotor is qualified.

[0003] The existing testing method involves mechanically driving the rotor to rotate after the motor is assembled and measuring the back electromotive force. However, if a problem occurs with the test rotor, the assembled motor needs to be disassembled, and the rotor and stator need to be reworked and repaired. Disassembly can easily cause damage to the motor, is time-consuming and labor-intensive, and severely impacts production efficiency. Utility Model Content

[0004] In view of this, it is necessary to provide a back EMF testing device for permanent magnet motors to solve the problem that existing motors can only be tested for back EMF after assembly, and the secondary damage caused by rework after testing is easy.

[0005] This utility model provides a back electromotive force testing device for a permanent magnet motor, comprising: Test lathe, used to clamp the stator and drive the rotor to rotate; A stator clamping assembly includes a stator fixing unit and a stator adjusting unit. The stator fixing unit includes a V-shaped base connected to the test lathe and two pads. The two pads abut against the two sides of the V-shaped base to form a V-shaped space for constraining the stator. The stator adjusting unit is disposed between the pads and the V-shaped base. The pads are inclined relative to one end of the stator. The stator adjusting unit can drive the pads to slide obliquely relative to the V-shaped base, thereby fine-tuning the relative height of the stator. Test components are used to measure the back electromotive force of the stator when the rotor is rotating.

[0006] Furthermore, the stator adjustment unit is a liftable lifting platform, the top of which abuts against the bottom of the pad, and the lifting platform can drive the pad to slide obliquely relative to the V-shaped base.

[0007] Furthermore, the stator adjustment unit includes a wedge-shaped drive block, the bottom end of the pad is formed with an inclined surface adapted to the wedge-shaped drive block, the wedge-shaped drive block is slidably engaged with the V-shaped base, and the wedge-shaped drive block can drive the pad to slide obliquely relative to the V-shaped base.

[0008] Furthermore, the stator adjustment unit also includes a threaded drive component, which is threadedly connected to the wedge-shaped drive block, and the threaded drive component is capable of driving the wedge-shaped drive block to feed and move.

[0009] Furthermore, the V-shaped base includes a base plate and two inclined side plates, which are arranged in an inverted "V" shape. The base plate is integrally connected to the two side plates, and the two side plates respectively cooperate with the two pads.

[0010] Furthermore, the side plate is provided with a sliding groove adapted to the pad block, and the sliding groove is inclined along the side plate.

[0011] Furthermore, the V-shaped base is provided with a connection hole for docking with the test lathe.

[0012] Furthermore, the inclination angle of the pad relative to one end of the stator is smaller than the inclination angle of the side plate.

[0013] Furthermore, the stator fixing unit also includes a pressure plate and two connecting members. The two ends of the connecting members are respectively connected to the V-shaped base and the pressure plate. The two connecting members are disposed on both sides of the V-shaped base. The connecting members can drive the pressure plate to press the stator against the V-shaped base.

[0014] Furthermore, the pressure plate has a recessed portion in the middle that is adapted to the stator.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) The present invention provides a back electromotive force testing device for a permanent magnet motor, comprising a stator clamping assembly, which includes a stator fixing unit and a stator adjusting unit. The stator fixing unit includes a V-shaped base connected to a test lathe and two pads. The two pads abut against the two sides of the V-shaped base to form a V-shaped space that constrains the stator. The circumferential surface of the stator abuts against the two pads, so that the central axis of the stator and the rotation axis of the lathe are coplanar in a vertical plane. The stator adjusting unit is located between the pads and the V-shaped base. The end of the pad that contacts the stator is inclined. The stator adjusting unit can drive the pads to slide obliquely, thereby adjusting the stator height so that the rotor and stator are coaxially arranged, ensuring a reasonable gap between the stator and the rotor. The testing assembly can measure the back electromotive force of the stator when the rotor rotates, and can evaluate the quality of the stator without assembling the motor, avoiding repeated disassembly and assembly due to unqualified testing, and eliminating the risk of damage to parts during disassembly.

[0016] (2) A back electromotive force testing device for a permanent magnet motor according to the present invention is provided with a test lathe. The chuck and tailstock of the test lathe respectively clamp the two ends of the fixed rotor. The test lathe can drive the rotor to rotate as a whole, providing energy for the generation of back electromotive force. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the stator clamping assembly in this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the stator clamping assembly in this utility model. Figure 2 ; Figure 4 This is a schematic diagram of the stator clamping assembly in this utility model. Figure 3 ; Figure 5 This is a schematic diagram of the V-shaped base in this utility model.

[0018] In the diagram, 100 represents the test lathe. 200. Stator clamping assembly; 210. Stator fixing unit; 211. V-shaped base; 211a. Base plate; 211b. Side plate; 211c. Slide groove; 211d. Connecting hole; 212. Pressure plate; 212a. Recess; 213. Connector; 220. Pad; 230. Stator adjusting unit; 231. Lifting platform; 300. Stator; 400, Rotor. Detailed Implementation

[0019] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0020] This embodiment discloses a back electromotive force (EMF) testing device for a permanent magnet motor, relating to the field of permanent magnet motor testing technology. Utilizing existing lathe equipment, the motor rotor 400 is clamped onto the lathe. A clamping assembly for the motor stator 300 is then provided. This assembly can clamp and fix the stator 300 and adjust its height to ensure a suitable clearance between the rotor 400 and the stator 300. The lathe drives the rotor 400 to rotate, thereby measuring the back EMF of the entire motor. Test results can be obtained and motor repair can be performed without assembling the motor.

[0021] Please see Figures 1 to 5This embodiment of a back electromotive force (EMF) testing device for a permanent magnet motor includes: a test lathe 100, a stator clamping assembly 200, and a testing component. The test lathe 100 can clamp a rotor 400. The stator clamping assembly 200 can fix the stator 300 onto the lathe bed. The testing component can measure the back EMF generated by the stator 300 when the rotor 400 rotates, allowing the rotor 400 to complete the back EMF measurement in an independent driving state, thereby eliminating the dependence on the overall assembly for testing.

[0022] The chuck and tailstock of the test lathe 100 clamp the two ends of the fixed rotor 400 respectively. The test lathe 100 can drive the rotor 400 to rotate as a whole, providing energy for the generation of back electromotive force.

[0023] The stator clamping assembly 200 includes a stator 300 fixing unit 210 and a stator 300 adjusting unit 230. The stator 300 fixing unit 210 includes a V-shaped base 211 connected to the test lathe 100 and two pads 220. The two pads 220 abut against the two sides of the V-shaped base 211 to form a V-shaped space that constrains the stator 300. The circumferential surfaces of the stator 300 abut against the two pads 220, so that the central axis of the stator 300 and the rotation axis of the lathe are coplanar in a vertical plane. The stator 300 adjusting unit 230 is disposed between the pads 220 and the V-shaped base 211. The end of the pad 220 that contacts the stator 300 is inclined. The stator 300 adjusting unit 230 can drive the pads 220 to slide obliquely, thereby adjusting the height of the stator 300 so that the rotor 400 and the stator 300 are coaxially arranged, ensuring a reasonable gap between the stator 300 and the rotor 400. The test assembly can measure the back electromotive force of the stator 300 when the rotor 400 rotates, and can evaluate the quality of the stator 300 without assembling the motor, avoiding repeated disassembly and assembly due to test failure, and eliminating the risk of damage to parts during the disassembly process.

[0024] During use, the rotor 400 is clamped on the spindle of the test lathe 100, and the stator 300 is fixed to the lathe bed via a V-shaped base 211. Two pads 220 obliquely abut from both sides of the V-shaped base 211, forming a V-shaped constraint space surrounding the stator 300. When it is necessary to adjust the coaxiality of the stator 300 and the rotor 400, the stator 300 adjustment unit 230 is operated to push the pads 220 to slide along the inclined surface of the V-shaped base 211. The inclined end face of the pads 220 drives the stator 300 to move vertically until the inner hole of the stator 300 and the outer circle of the rotor 400 reach a preset gap. After the test lathe 100 drives the rotor 400 to rotate, the test assembly collects the back electromotive force waveform in real time through the leads connected to the stator 300 windings.

[0025] In some embodiments, please refer to 2 and Figure 3The stator 300 adjustment unit 230 is a liftable lifting platform 231. The top of the lifting platform 231 abuts against the bottom of the pad block 220. The lifting platform 231 can lift and lower relative to each other using its own structure, thereby driving the pad block 220 to slide obliquely along the V-shaped base 211, thereby changing the contact position between the V-shaped base 211 and the stator 300, driving the stator 300 to lift and lower relative to each other, accurately adjusting the installation height of the stator 300, ensuring the precise alignment of the stator 300 and the rotor 400, and improving the measurement accuracy of the back electromotive force.

[0026] In the specific implementation process, the lifting platform 231 is a support structure that can adjust its height mechanically or electrically. Specifically, a scissor lift can be adopted, and the lifting platform 231 is driven to move up and down by a hand-cranked screw, thereby driving the pad block 220 to move in the inclined direction.

[0027] During testing, when the installation height of the stator 300 needs to be adjusted, the lifting platform 231 pushes the pad 220 to slide in the inclined direction through vertical lifting motion. Since the bottom of the pad 220 is in contact with the top of the lifting platform 231, when the lifting platform 231 rises, the pad 220 moves outward in the inclined direction, thereby raising the installation position of the stator 300; when the lifting platform 231 descends, the pad 220 moves inward in the inclined direction, lowering the installation position of the stator 300.

[0028] In some embodiments, the stator 300 adjustment unit 230 includes a wedge-shaped drive block, and the bottom end of the pad block 220 forms an inclined surface adapted to the wedge-shaped drive block. The wedge-shaped drive block is slidably engaged with the V-shaped base 211. The relative translation of the wedge-shaped drive block can be achieved by using the inclined surface to push the V-shaped base 211 to slide obliquely, thereby driving the stator 300 to rise and fall relative to each other and precisely adjusting the installation height of the stator 300.

[0029] In practical implementation, the wedge-shaped drive block is a block structure with an inclined surface, which can be formed by processing metal materials. The inclined surface contacts the pad 220 to generate a displacement component, thereby changing the height of the pad 220. The wedge-shaped drive block can be slidably engaged with the V-shaped base 211 using a dovetail groove or T-groove, thus ensuring that the wedge-shaped drive block moves in a predetermined direction. The inclination angle between the bottom end of the pad 220 and the contact surface of the wedge-shaped drive block matches, specifically set to an inclination angle of 5° to 15°, so that the horizontal movement of the wedge-shaped drive block is converted into the vertical displacement of the pad 220.

[0030] When the height of the stator 300 needs to be adjusted, the wedge-shaped drive block is pushed by an external force to move along the slide groove 211c of the V-shaped base 211. Since the wedge-shaped drive block is in contact with the inclined surface at the bottom of the pad 220, its horizontal movement will force the pad 220 to slide obliquely, thereby changing the position of the top of the pad 220 supporting the stator 300.

[0031] It should be noted that a lead screw and nut structure is also provided between the wedge-shaped drive block and the V-shaped base 211. The lead screw passes through the wedge-shaped drive block and is threadedly connected to the wedge-shaped drive block. The lead screw can be manually rotated to achieve precise control of the wedge-shaped drive block.

[0032] In some embodiments, workers can manually replace shims of different thicknesses to change the contact position between the V-shaped base 211 and the stator 300, drive the stator 300 to rise and fall relative to each other, precisely adjust the installation height of the stator 300, ensure the precise alignment of the stator 300 and the rotor 400, and improve the measurement accuracy of the back electromotive force.

[0033] In some embodiments, the V-shaped base 211 includes a base plate 211a and two inclined side plates 211b. The two side plates 211b are arranged in an inverted "V" shape, and a V-shaped structure is formed between the side plates 211b and the base plate 211a. The V-shaped base 211 is integrally connected with the two side plates 211b. The two side plates 211b cooperate with two pads 220 respectively, so that the pads 220 are relatively inclined, thereby achieving the purpose of positioning and supporting the stator 300.

[0034] In the specific implementation process, the base plate 211a of the V-shaped base 211 is integrally cast and molded to form a structurally stable base. The base plate 211a is set relatively horizontally, and the included angle between the side plate 211b and the base plate 211a is 30°-45°.

[0035] In some embodiments, please refer to Figure 2 and Figure 5 The side plate 211b is provided with a sliding groove 211c that matches the pad 220. The sliding groove 211c is inclined along the side plate 211b. The sliding groove 211c can achieve precise guidance during the height adjustment process of the stator 300, effectively preventing the stator 300 installation error caused by the position displacement of the pad 220 during the adjustment process. At the same time, the structure of the sliding groove 211c transforms the complex spatial positioning into linear motion control, simplifies the operation process, improves the adjustment efficiency of the test device, and ensures the reliability of the back electromotive force test data.

[0036] In practical implementation, the groove 211c is a recessed structure on the side plate 211b used to guide the movement of the pad 220. Specifically, it can be formed by machining a straight channel, the width of which matches the protruding part at the bottom of the pad 220. The inclination angle of the groove 211c is consistent with the inclination direction of the side plate 211b, so that the pad 220 can maintain contact stability with the side plate 211b during movement.

[0037] During operation, the inclination direction of the slide groove 211c is parallel to the extension direction of the side plate 211b. When the protrusion at the bottom of the pad 220 is inserted into the slide groove 211c, the pad 220 slides along the inclination direction of the slide groove 211c under the drive of the adjustment unit. Due to the constraint effect of the slide groove 211c on the movement trajectory of the pad 220, the pad 220 always maintains linear contact with the side wall of the V-shaped base 211 during height adjustment, avoiding offset or shaking during the adjustment process.

[0038] In some embodiments, please refer to Figure 3 The tilt angle of the pad 220 relative to the stator 300 is smaller than the tilt angle of the side plate 211b. By reducing the tilt angle of the pad 220, the contact surface between the pad 220 and the stator 300 moves up or down continuously, thereby realizing the up and down movement of the stator 300.

[0039] In the specific implementation process, the tilt angle formed between the end face of the pad 220 that contacts the stator 300 and the horizontal plane can be achieved by machining a slope with a specific angle. This angle is set to be smaller than the tilt angle of the side plate 211b, thereby forming a progressive contact surface during the adjustment process and adjusting the height of the contact surface.

[0040] The tilt angle of the pad 220 is set to be less than the tilt angle of the side plate 211b, so that the pad 220 forms an asymmetrical inclined surface fit when it contacts the V-shaped base 211. When the stator 300 adjustment unit 230 drives the pad 220 to slide obliquely along the side wall of the V-shaped base 211, the contact area between the pad 220 and the stator 300 moves up and down, thereby driving the stator 300 up and down.

[0041] In some embodiments, the stator 300 fixing unit 210 further includes a pressure plate 212 and two connecting members 213. The two ends of the connecting members 213 are respectively connected to the V-shaped base 211 and the pressure plate 212. The two connecting members 213 are disposed on both sides of the V-shaped base 211. The connecting members 213 can drive the pressure plate 212 to press against the stator 300 relative to the V-shaped base 211. The V-shaped base 211 and the pressure plate 212 work together to fully fix the stator 300.

[0042] In the specific implementation, the pressure plate 212 is a plate-like structure covering the outside of the stator 300. It can be implemented using a metal plate with recesses 212a, used to apply uniform vertical pressure to the stator 300. The connector 213 is a rigid component used to connect the pressure plate 212 and the V-shaped base 211. Specifically, it can be a threaded rod. By adjusting the length or position of the connector 213, the clamping force of the pressure plate 212 on the stator 300 can be controlled. The two connectors 213 are symmetrically distributed on both sides of the V-shaped base 211, so that the stator 300 is bidirectionally constrained within the V-shaped space, preventing the stator 300 from shifting due to vibration during the test.

[0043] When the stator 300 is placed within the V-shaped space formed by the V-shaped base 211 and the pad 220, its effective length is shortened by tightening the connector 213 (e.g., a threaded rod) or driving the connector 213 (e.g., a hydraulic push rod). The pressure plate 212 moves downwards and contacts the surface of the stator 300, thereby pressing the stator 300 firmly between the V-shaped base 211 and the pad 220. The recess 212a in the center of the pressure plate 212 matches the outer contour of the stator 300, further limiting the radial displacement of the stator 300. Thus, the stator 300 remains stable throughout the test, ensuring a uniform air gap between the rotor 400 and the stator 300 and preventing back EMF measurement errors caused by stator 300 loosening.

[0044] It should be further explained that the pressure plate 212 has a recess 212a in the middle that is adapted to the stator 300. The design of the recess 212a optimizes the pressure distribution through shape matching, which not only avoids the deformation of the stator 300 due to local pressure, but also reduces secondary damage caused by indentations during disassembly and rework. The radius of curvature of the recess 212a can be consistent with the outer diameter of the stator 300, so that the pressure plate 212 and the stator 300 form a surface contact rather than a line contact, further reducing the risk of surface deformation of the stator 300 during the pressing process.

[0045] In some embodiments, the base plate 211a is provided with a connection hole 211d for docking with the test lathe 100. Bolts can be connected to the test lathe 100 through the connection hole 211d. Through this connection method, the stator clamping assembly 200 can form a stable assembly relationship with the test lathe 100, and avoid measurement errors caused by vibration when the rotor 400 rotates at high speed.

[0046] In practical implementation, the connecting hole 211d is a through hole or threaded hole opened on the V-shaped base 211. It can be fixedly connected to the test lathe 100 by using a threaded hole with a bolt, or quickly positioned by using a pin hole with a locating pin. The hole feature is used to establish a rigid connection between the V-shaped base 211 and the test lathe 100 to avoid relative displacement during the test.

[0047] During installation, bolts can pass through the connecting hole 211d to lock the V-shaped base 211 onto the preset position of the test lathe 100, or it can be quickly positioned using a locating pin and then fixed with an auxiliary fixture. The connecting hole 211d structure not only improves installation efficiency but also effectively suppresses the interference of mechanical vibration on the back EMF measurement signal through rigid connection, thereby improving the reliability of the test results.

[0048] In some embodiments, the test assembly includes a voltmeter. By connecting the contacts of the voltmeter to the leads of the stator 300 winding, the reverse electromotive force generated during the rotation of the rotor 400 can be obtained.

[0049] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the present utility model.

Claims

1. A back electromotive force testing device for a permanent magnet motor, characterized in that, include: Test lathe, used to clamp the stator and drive the rotor to rotate; A stator clamping assembly includes a stator fixing unit and a stator adjusting unit. The stator fixing unit includes a V-shaped base connected to the test lathe and two pads. The two pads abut against the two sides of the V-shaped base to form a V-shaped space for constraining the stator. The stator adjusting unit is disposed between the pads and the V-shaped base. The pads are inclined relative to one end of the stator. The stator adjusting unit can drive the pads to slide obliquely relative to the V-shaped base, thereby fine-tuning the relative height of the stator. Test components are used to measure the back electromotive force of the stator when the rotor is rotating.

2. The back electromotive force testing device for a permanent magnet motor according to claim 1, characterized in that, The stator adjustment unit is a liftable platform, the top of which abuts against the bottom of the pad, and the platform can drive the pad to slide obliquely relative to the V-shaped base.

3. The back electromotive force testing device for a permanent magnet motor according to claim 1, characterized in that, The stator adjustment unit includes a wedge-shaped drive block. The bottom end of the pad is formed with an inclined surface adapted to the wedge-shaped drive block. The wedge-shaped drive block is slidably engaged with the V-shaped base. The wedge-shaped drive block can drive the pad to slide obliquely relative to the V-shaped base.

4. The back electromotive force testing device for a permanent magnet motor according to claim 3, characterized in that, The stator adjustment unit further includes a threaded drive component, which is threadedly connected to the wedge-shaped drive block and can drive the wedge-shaped drive block to feed.

5. A back electromotive force testing device for a permanent magnet motor according to any one of claims 1-4, characterized in that, The V-shaped base includes a base plate and two inclined side plates, which are arranged in an inverted "V" shape. The V-shaped base is integrally connected to the two side plates, and the two side plates respectively cooperate with the two pads.

6. The back electromotive force testing device for a permanent magnet motor according to claim 5, characterized in that, The side plate is provided with a sliding groove adapted to the pad block, and the sliding groove is inclined along the side plate.

7. The back electromotive force testing device for a permanent magnet motor according to claim 5, characterized in that, The V-shaped base is provided with a connection hole for docking with the test lathe.

8. The back electromotive force testing device for a permanent magnet motor according to claim 5, characterized in that, The inclination angle of the pad relative to one end of the stator is smaller than the inclination angle of the side plate.

9. The back electromotive force testing device for a permanent magnet motor according to claim 1, characterized in that, The stator fixing unit also includes a pressure plate and two connecting members. The two ends of the connecting members are respectively connected to the V-shaped base and the pressure plate. The two connecting members are disposed on both sides of the V-shaped base. The connecting members can drive the pressure plate to press the stator against the V-shaped base.

10. The back electromotive force testing device for a permanent magnet motor according to claim 9, characterized in that, The pressure plate has a recessed portion in the middle that is adapted to the stator.

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