Motor withstand voltage detection tool and method thereof

Abstract

The invention relates to the field of voltage withstanding detection, and discloses a motor voltage withstanding detection tool and a method thereof.The detection tool comprises a detection table, a limiting clamping mechanism is arranged on the detection table, the limiting clamping mechanism is used for clamping and limiting a motor, and a connecting mechanism is further arranged on one side of the detection table; the connecting mechanism is used for being automatically butted with an exposed wiring terminal of the motor during testing and forming an electric loop; the connecting mechanism comprises a driving assembly and an electrode assembly pushed by the driving assembly, the electrode assembly comprises an electrode base body and an electrode contact structure arranged at the end, and the electrode base body is electrically connected with the signal input end of the leakage current sensor. According to the invention, through arrangement of the connecting mechanism, elastic floating of the electrode contact mechanism and the projection array, butt-joint profiling deformation can be realized, contact interference caused by vibration can be reduced, the projection array is utilized to overcome an oxide film to increase contact points, and the detection stability of the whole loop is improved.

Description

Technical Field

[0001] This invention relates to the field of withstand voltage testing, and more specifically to a fixture and method for testing the withstand voltage of an electric motor. Background Technology

[0002] When using leakage current sensors in electrical sensors to perform withstand voltage tests on motors, a technical problem arises: insufficient microscopic adaptability of the tooling electrode contact structure leads to poor stability in leakage current acquisition. In automated motor production lines, online withstand voltage testing is a critical process for ensuring product insulation safety. This process requires the testing fixture to automatically complete the electrical connection with the motor's exposed terminals, apply high voltage, detect leakage current, and disconnect within seconds. The detection accuracy of the leakage current sensor directly depends on the contact stability of the test circuit formed between the tooling electrodes and the terminals.

[0003] However, existing motor withstand voltage testing fixtures use a one-piece planar rigid structure for the electrode contact surface. In actual production, after the motor terminals undergo stamping and electroplating processes, microscopic tapers and electroplating particles easily remain on the end face. When the electrode is attached to the terminal end face, only local point contact can be formed by relying on the protruding parts of the terminal end face, resulting in insufficient effective contact area. Moreover, the contact points are concentrated at the burrs or electroplating particles on the terminal edge. At the same time, the fixture electrode lacks a microscopic elastic buffer structure. Slight vibrations generated by the motor during the test can cause frequent switching of the contact point, resulting in instantaneous jumps in the contact resistance of the leakage current sensor acquisition circuit. This causes spike interference in the leakage current signal acquired by the sensor, affecting the accuracy of the withstand voltage test results.

[0004] More importantly, the current concentration effect caused by localized point contact exacerbates oxidation at the terminal contact points, creating a vicious cycle of unstable contact, worsened oxidation, and even worse contact, further reducing the long-term reliability of the fixture. Current technologies for optimizing motor withstand voltage testing fixtures primarily focus on macroscopic clamping force adjustment and overall structural strength improvement, completely neglecting the microscopic fit between the electrode contact surface and the terminal end face. Therefore, improvements to the motor withstand voltage testing fixture are urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a motor withstand voltage testing fixture and method to solve at least one of the above-mentioned technical problems.

[0006] The objective of this invention can be achieved through the following technical solutions: A motor withstand voltage testing fixture includes: a testing table, a limiting clamping mechanism on the testing table for clamping and limiting the motor, and a connecting mechanism on one side of the testing table for automatically connecting with the exposed terminals of the motor during testing to form an electrical circuit. The connection mechanism includes a drive assembly and an electrode assembly driven by the drive assembly. The electrode assembly includes an electrode substrate and an electrode contact structure disposed at the end. The electrode contact structure can elastically float when it mates with the exposed terminals of the motor. The electrode substrate is electrically connected to the signal input terminal of the leakage current sensor.

[0007] In a preferred embodiment, the electrode contact structure includes an elastic buffer layer, a flexible conductive layer, and a protrusion array stacked sequentially. The elastic buffer layer is connected to the electrode substrate to provide elastic floating perpendicular to the contact direction; A flexible conductive layer covers the outer surface of the elastic buffer layer; The protrusion array consists of multiple independent and spaced conductive protrusion units, which are fixed to the surface of the flexible conductive layer. The top of the conductive protrusion unit is configured as a pointed structure, which is used to pierce the oxide film on the terminal surface.

[0008] The drive assembly includes a pneumatic telescopic column, a mounting plate, and a pressure sensor; the electrode substrate is fixedly connected to the mounting plate; the output end of the pneumatic telescopic column is connected to the mounting plate, and the electrode assembly is fixed on the mounting plate. The pneumatic telescopic column is used to drive the mounting plate and the electrode assembly to move linearly in a direction perpendicular to the exposed terminal face of the motor. A slider is fixedly installed on one side of the mounting plate. The slider slides in conjunction with a linear guide rail, which is fixedly mounted on the testing platform. The pressure sensor is located between the output end of the pneumatic telescopic column and the mounting plate.

[0009] The limiting clamping mechanism includes an electric push rod, one end of which is fixedly mounted on one side of the testing table, and the other end is connected to the frame. The frame has multiple slots on the side facing the motor, and the bottom wall of the slots is inclined. The testing platform is equipped with multiple grooves for placing motors, and the slots are set one-to-one with the grooves. A slot is provided on the side of the groove facing the frame. An inclined insert is slidably installed in the slot. The thicker end of the inclined insert abuts against the bottom wall of the slot. A return spring is provided between the inclined insert and the side wall of the slot.

[0010] In a preferred embodiment, a cleaning mechanism is also provided on the side of the testing platform near the mounting plate. The cleaning mechanism is used to clean the terminal face and / or the protrusion array.

[0011] The cleaning mechanism includes a movable groove and a displacement component. The movable groove is set on the detection table, and the movable groove and the groove are set one-to-one. Each movable groove has a movable part slidably connected inside. The cleaning component is set on the top surface of the movable part. The cleaning component can change its posture as it moves away from the groove opening. The displacement component pushes the movable part to move.

[0012] The cleaning assembly includes two elastic cleaning plates. Cleaning brushes are provided on the side surfaces of the elastic cleaning plates. The bottom of both elastic cleaning plates is integrally formed with protrusions, and the protrusions are inserted into a slot opened on the top surface of the movable part. A damping spring is provided in the slot, and the two protrusions are connected by the damping spring.

[0013] The displacement assembly includes a pusher. A swing groove is provided on the test platform for the pusher to move. The pusher is hinged in the swing groove by a torsion spring. The swing groove is connected to the movable groove. A column is fixedly installed at the bottom of the mounting plate. The column is inserted into the swing groove. When the mounting plate moves into the groove, it simultaneously drives the column to squeeze one end of the pusher, causing the pusher to deflect and the other end of the pusher to push the movable part to one side.

[0014] A method for testing the withstand voltage of an electric motor includes the following steps: S1: Place the motor in the groove of the testing table; S2: Start the electric actuator to drive the frame to move towards the motor. The inclined bottom wall of the slot on the frame pushes the inclined plug-in to slide into the groove, pressing the motor stator from the side to complete the clamping. At the same time, start the pneumatic telescopic column to push the mounting plate and electrode assembly to move along the linear guide rail towards the motor terminal. S3: When the array of protrusions on the electrode contact structure initially contacts the terminal block, the pneumatic telescopic column is activated according to the feedback signal of the pressure sensor, driving the mounting plate to continue moving forward until the contact pressure reaches the preset value. S4: Perform a withstand voltage test on the motor using a leakage current sensor; S5: After the test is completed, the pneumatic telescopic column retracts, the electric push rod drives the frame to reset, the electrode assembly and the inclined plug retract under the action of the reset spring, and the motor is released.

[0015] The beneficial effects of this invention are: This invention reliably removes the surface oxide layer mechanically through a pointed structure, establishing an initial channel for electron flow; the elastic buffer layer allows the contact surface to adapt to the macroscopic and microscopic geometry of the terminal, ensuring uniform pressure distribution; the flexible conductive layer further wets and wraps the contact gap at the microscopic scale, fusing discrete contact points into a continuous conductive surface, thereby upgrading the contact properties from mechanical overlap to interface fusion. This not only significantly reduces the contact resistance value, but more importantly, improves its stability; and reduces the instantaneous jumps in current signals caused by contact problems. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1A partial exploded view; Figure 3 for Figure 1 A schematic diagram of the middle electrode contact structure; Figure 4 This is a schematic diagram showing the location of the pressure sensor in this invention; Figure 5 This is a schematic diagram of the cleaning mechanism.

[0018] Figure Descriptions: 1. Testing table; 2. Limiting and clamping mechanism; 21. Electric actuator; 22. Frame; 23. Slot; 24. Groove; 25. Slot opening; 26. Angled insert; 27. Return spring; 3. Connecting mechanism; 31. Drive assembly; 311. Pneumatic telescopic column; 312. Mounting plate; 313. Pressure sensor; 314. Slider; 315. Linear guide rail; 32. Electrode assembly; 321. Electrode substrate; 322. Electrode contact structure; 3221 3222, Flexible conductive layer; 3223, Protrusion array; 3224, Conductive protrusion unit; 3325, Tip structure; 4, Terminal block; 5, Cleaning mechanism; 51, Movable groove; 52, Displacement assembly; 521, Pushing component; 522, Swing groove; 523, Column; 53, Movable part; 54, Cleaning assembly; 541, Elastic cleaning plate; 542, Cleaning brush; 543, Protrusion; 544, Slot; 545, Damping spring. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the field of small household appliance manufacturing and quality control, motors, as core power components, are widely used in products such as hair dryers, blenders, vacuum cleaners, juicers, and coffee machines. Since small household appliances are typically in direct contact with users, their electrical safety is paramount. As high-voltage operating components, motors must undergo rigorous Hi-Pot withstand voltage testing during the manufacturing process to verify that the insulation performance between their windings and the casing or ground meets safety standards such as IEC60335 and GB4706.

[0021] Please see Figures 1-5 As shown, the objective of this invention can be achieved through the following technical solutions: A motor withstand voltage testing fixture includes: a testing table 1, a limiting clamping mechanism 2 provided on the testing table 1, the limiting clamping mechanism 2 being used to clamp and limit the motor, and a connecting mechanism 3 being provided on one side of the testing table 1, the connecting mechanism 3 being used to automatically connect with the exposed wiring terminals 4 of the motor during the test and form an electrical circuit. The connection mechanism 3 includes a drive assembly 31 and an electrode assembly 32 driven by the drive assembly 31. The electrode assembly 32 includes an electrode base 321 and an electrode contact structure 322 disposed at the end. The electrode contact structure 322 can elastically float when it is connected to the exposed wiring terminal 4 of the motor. The electrode base 321 is electrically connected to the signal input terminal of the leakage current sensor.

[0022] The limiting clamping mechanism 2 includes an electric push rod 21. One end of the electric push rod 21 is fixedly installed on one side of the testing table 1, and the other end is connected to the frame 22. The frame 22 is provided with multiple slots 23 on the side facing the motor, and the bottom wall of the slots 23 is inclined. The testing table 1 is provided with multiple grooves 24, which are used to place motors. The slots 23 are provided in a one-to-one correspondence with the grooves 24. A slot 25 is provided on the side of the groove 24 facing the frame 22. An inclined insert 26 is slidably arranged in the slot 25. The thicker end of the inclined insert abuts against the bottom wall of the slot 23. A return spring 27 is provided between the inclined insert and the side wall of the slot 25.

[0023] First, after the motor is placed in the corresponding position on the testing table 1, the drive unit moves the frame 22 toward the motor. The slot 23 on the frame 22 abuts against the inclined plug 26 through the inclined groove wall. As the frame 22 continues to move, the inclined groove wall generates a lateral thrust on the inclined plug 26, causing the inclined plug 26 to slide in the corresponding slot 25, and finally presses the motor from the side to complete the clamping and fixing of the motor. When the test is completed, the drive unit drives the frame 22 to reset, and the inclined plug 26 returns to the initial position under the action of the reset unit, releasing the motor.

[0024] The aforementioned clamping method, through the cooperation of the mechanical structure, can form a stable limit on the motor, effectively preventing the motor from shifting position due to vibration, external force, or other factors during the testing process. This ensures the accuracy of the subsequent docking between the electrode assembly 32 and the motor terminal 4, laying the foundation for the stability of the entire testing process. The reset spring 27 enables automatic reset of the clamping and releasing actions, eliminating the need for additional manual operation and improving the smoothness of the testing process.

[0025] The electrode contact structure 322 includes an elastic buffer layer 3221, a flexible conductive layer 3222, and a protrusion array 3223 stacked sequentially. The elastic buffer layer 3221 is connected to the electrode substrate 321 to provide elastic floating perpendicular to the contact direction; A flexible conductive layer 3222 covers the outer surface of the elastic buffer layer 3221; The protrusion array 3223 is composed of multiple independent and spaced conductive protrusion units 3224 and is fixed to the surface of the flexible conductive layer 3222; the top of the conductive protrusion unit 3224 is provided as a tip structure 3325, which is used to pierce the oxide film on the terminal surface.

[0026] In one implementation, the tip structure 3325 has a radius of curvature of less than 10 μm or a vertex angle of less than 60°.

[0027] In one embodiment, the flexible conductive layer 3222 is made of conductive silicone or metal braided mesh, the thickness of the flexible conductive layer 3222 is 0.05-0.15mm, and the surface resistance is not greater than 0.1Ω·cm; the micro-bump unit is at least one of hemispherical, cylindrical or pyramidal protrusions, the height is 0.1-0.3mm, and the equivalent diameter of the bottom surface is less than or equal to 0.5mm.

[0028] When the electrode assembly 32 is connected to the motor terminal 4, the elastic buffer layer 3221 will generate elastic floating perpendicular to the contact direction. Combined with the flexible conductive layer 3222's flexibility, the entire contact structure can adapt to the micro-morphology of the terminal 4's end face, achieving a tight fit. The pointed structure 3325 at the top of the conductive protrusion unit 3224 will contact the surface of the terminal 4, breaking the oxide film that may exist on the surface. Multiple independent conductive protrusion units 3224 can form multiple contact points with the terminal 4, constructing a stable electrical path.

[0029] This invention solves the problem of insufficient adhesion of traditional rigid electrodes by combining an elastic buffer layer 3221 and a flexible conductive layer 3222. It can buffer the slight vibrations generated by the motor during the detection process, reduce the frequent switching of contact points caused by vibration, avoid instantaneous jumps in contact resistance, and ensure the stability of the circuit. The pointed structure 3325 effectively breaks the oxide film and avoids the oxide film from hindering conductivity. Multiple contact points increase the effective contact area and avoid the current concentration effect. This not only improves the stability and accuracy of the leakage current sensor signal acquisition, but also slows down the oxidation rate of the contact parts, breaking the vicious cycle of unstable contact, aggravated oxidation, and worse contact, and improving the long-term reliability of the tooling.

[0030] The drive assembly 31 includes a pneumatic telescopic column 311, a mounting plate 312, and a pressure sensor 313; the electrode substrate 321 is fixedly connected to the mounting plate 312; the output end of the pneumatic telescopic column 311 is connected to the mounting plate 312, and the electrode assembly 32 is fixed on the mounting plate 312. The pneumatic telescopic column 311 is used to drive the mounting plate 312 and the electrode assembly 32 to move linearly in a direction perpendicular to the end face of the exposed terminal 4 of the motor. A slider 314 is fixedly installed on one side of the mounting plate 312. The slider 314 slides with the linear guide rail 315, which is fixedly installed on the testing table 1. The pressure sensor 313 is located between the output end of the pneumatic telescopic column 311 and the mounting plate 312.

[0031] In this invention, after the pneumatic telescopic column 311 is activated, it pushes the mounting plate 312 to move along the direction defined by the guide component, thereby driving the electrode assembly 32 closer to the motor terminal 4. When the electrode assembly 32 initially contacts the terminal 4, the pressure sensor 313 can sense the contact pressure in real time and feed the signal back to the pneumatic telescopic column 311. The pneumatic telescopic column 311 adjusts its thrust according to the feedback signal, allowing the mounting plate 312 to continue moving until the contact pressure reaches a suitable state. In this invention, the cooperation of the guide component ensures the accurate movement direction of the electrode assembly 32, avoiding docking failure due to movement deviation. The linkage between the pressure sensor 313 and the pneumatic telescopic column 311 can accurately control the contact pressure between the electrode assembly 32 and the terminal 4, ensuring both tight contact and preventing excessive pressure from damaging the motor terminal 4 or the electrode assembly 32, thus extending the service life of the components.

[0032] In a preferred embodiment, a cleaning mechanism 5 is also provided on the side of the testing station 1 near the mounting plate 312. The cleaning mechanism 5 is used to clean the end face of the wiring terminal 4 and / or the protrusion array 3223.

[0033] The cleaning mechanism 5 includes a movable groove 51 and a displacement component 52. The movable groove 51 is opened on the detection table 1. The movable groove 51 is arranged in a one-to-one correspondence with the groove 24. The movable part 53 is slidably connected in the movable groove 51. The cleaning component 54 is provided on the top surface of the movable part 53. The cleaning component 54 can change its posture as it moves away from the groove opening 25. The displacement component 52 pushes the movable part 53 to move.

[0034] The cleaning assembly 54 includes two elastic cleaning plates 541. Cleaning brushes 542 are provided on the side surfaces of the elastic cleaning plates 541. The bottom of both elastic cleaning plates 541 is integrally formed with protrusions 543, and the protrusions 543 are inserted into a slot 544 opened on the top surface of the movable part 53. A damping spring 545 is provided in the slot 544, and the two protrusions 543 are connected by the damping spring 545.

[0035] The displacement assembly 52 includes a pusher 521. A swing groove 522 is provided on the measuring platform for the pusher 521 to move. The pusher 521 is hinged in the swing groove 522 by a torsion spring. The swing groove 522 is connected to the movable groove 51. A column 523 is fixedly provided at the bottom of the mounting plate 312. The column 523 is inserted into the swing groove 522. When the mounting plate 312 moves towards the groove 24, it simultaneously drives the column 523 to squeeze one end of the pusher 521, causing the pusher 521 to deflect. This causes the other end of the pusher 521 to push the movable part 53 to move to one side.

[0036] When the mounting plate 312 moves toward the motor, the column 523 at the bottom of the mounting plate 312 presses against the pusher 521 of the displacement assembly 52. ​​The pusher 521 can be an arc-shaped plate. Under the action of the hinge structure, the pusher 521 deflects, thereby pushing the movable part 53 to move in the movable groove 51. The movable part 53 drives the cleaning assembly 54 at the top to move. The cleaning assembly 54 changes its posture during the movement, so that the cleaning brush 542 can fully contact the end face of the motor terminal 4 and the protrusion array 3223 of the electrode assembly 32, thereby cleaning the surfaces of both. After the detection is completed, the relevant components are reset, and the cleaning assembly 54 also returns to its initial position. This invention completes the cleaning process before the electrode assembly 32 and the terminal 4 are connected, which can effectively remove dust, impurities and other substances that may affect the contact effect from the surfaces of both, avoid poor contact caused by impurities, further ensure the stability of the electrical circuit, and indirectly improve the accuracy of the test results. At the same time, the cleaning action can reduce the wear of impurities on the tip structure 3325 of the protrusion array 3223 and the surface of the terminal 4, extend the service life of related components, and reduce the maintenance cost of the tooling.

[0037] It should be noted that: The cleaning mechanism 5, as a pre-treatment step before testing, removes impurities and dust from the end face of the terminal 4 and the surface of the electrode protrusion array 3223 in advance, creating a clean docking environment for the electrode contact structure 322. This allows the tip structure 3325 of the protrusion array 3223 to act more directly on the terminal surface, preventing impurities from hindering contact or affecting the oxide film removal effect, thus indirectly enhancing the effectiveness of electrode contact. Meanwhile, the limiting clamping mechanism 2 achieves stable positioning of the motor through mechanical linkage, preventing the motor from shifting during testing and causing electrode misalignment. This provides a precise benchmark for the directional movement and pressure control of the drive component 31, ensuring that the electrode contact structure 322 can fully fit with the terminal end face. This allows the floating adaptation function of the elastic buffer layer 3221 and the fitting compensation function of the flexible conductive layer 3222 to be fully utilized, further improving the stability of the contact point.

[0038] The guiding motion and pressure feedback mechanism of the drive component 31, on the one hand, allows the electrode component 32 to accurately approach the terminal in a preset direction, and on the other hand, it avoids contact that is too loose or too tight through pressure adjustment. Too loose a contact will lead to poor contact, while too tight a contact may damage the electrode or terminal. This precise control allows the multi-point contact advantage of the electrode contact structure 322 to be fully realized. Multiple conductive protrusion units 3224 form a stable electrical circuit, which greatly reduces the contact point switching caused by vibration, reduces the interference of leakage current signal, and allows the leakage current sensor to collect real and reliable detection data, thereby improving the accuracy of withstand voltage detection. The stable contact state also avoids local current concentration, slows down the oxidation rate of the terminal and electrode, and breaks the vicious cycle.

[0039] A method for testing the withstand voltage of an electric motor includes the following steps: S1: Place the motor in the groove of the testing table; S2: Start the electric actuator to drive the frame to move towards the motor. The inclined bottom wall of the slot on the frame pushes the inclined plug-in to slide into the groove, pressing the motor stator from the side to complete the clamping. At the same time, start the pneumatic telescopic column to push the mounting plate and electrode assembly to move along the linear guide rail towards the motor terminal. S3: When the array of protrusions on the electrode contact structure initially contacts the terminal block, the pneumatic telescopic column is activated according to the feedback signal of the pressure sensor, driving the mounting plate to continue moving forward until the contact pressure reaches the preset value. S4: Perform a withstand voltage test on the motor using a leakage current sensor; S5: After the test is completed, the pneumatic telescopic column retracts, the electric push rod drives the frame to reset, the electrode assembly and the inclined plug retract under the action of the reset spring, and the motor is released.

[0040] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A motor withstand voltage testing fixture, characterized in that, include: The testing platform is equipped with a limit clamping mechanism to clamp and limit the motor. A connecting mechanism is also provided on one side of the testing platform to automatically connect with the exposed terminals of the motor during testing and form an electrical circuit. The connection mechanism includes a drive assembly and an electrode assembly driven by the drive assembly. The electrode assembly includes an electrode substrate and an electrode contact structure disposed at the end. The electrode contact structure can elastically float when it mates with the exposed terminals of the motor. The electrode substrate is electrically connected to the signal input terminal of the leakage current sensor.

2. The motor withstand voltage testing fixture according to claim 1, characterized in that, The electrode contact structure includes an elastic buffer layer, a flexible conductive layer, and a protrusion array stacked sequentially. The elastic buffer layer is connected to the electrode substrate to provide elastic floating perpendicular to the contact direction; A flexible conductive layer covers the outer surface of the elastic buffer layer; The protrusion array consists of multiple independent and spaced conductive protrusion units, which are fixed to the surface of the flexible conductive layer. The top of the conductive protrusion unit is configured as a pointed structure, which is used to pierce the oxide film on the terminal surface.

3. The motor withstand voltage testing fixture according to claim 2, characterized in that, The drive assembly includes a pneumatic telescopic column, a mounting plate, and a pressure sensor; the electrode substrate is fixedly connected to the mounting plate; the output end of the pneumatic telescopic column is connected to the mounting plate, and the electrode assembly is fixed on the mounting plate. The pneumatic telescopic column is used to drive the mounting plate and the electrode assembly to move linearly in a direction perpendicular to the exposed terminal face of the motor. A slider is fixedly installed on one side of the mounting plate. The slider slides in conjunction with a linear guide rail, which is fixedly mounted on the testing platform. The pressure sensor is located between the output end of the pneumatic telescopic column and the mounting plate.

4. The motor withstand voltage testing fixture according to claim 1 or 3, characterized in that, The limiting clamping mechanism includes an electric push rod, one end of which is fixedly mounted on one side of the testing table, and the other end is connected to the frame. The frame has multiple slots on the side facing the motor, and the bottom wall of the slots is inclined. The testing platform is equipped with multiple grooves for placing motors, and the slots are set one-to-one with the grooves. A slot is provided on the side of the groove facing the frame. An inclined insert is slidably installed in the slot. The thicker end of the inclined insert abuts against the bottom wall of the slot. A return spring is provided between the inclined insert and the side wall of the slot.

5. The motor withstand voltage testing fixture according to claim 1 or 3, characterized in that, A cleaning mechanism is also provided on the side of the testing platform near the mounting plate. The cleaning mechanism is used to clean the terminal face and / or the protrusion array.

6. The motor withstand voltage testing fixture according to claim 5, characterized in that, The cleaning mechanism includes a movable groove and a displacement component. The movable groove is set on the detection table, and the movable groove and the groove are set one-to-one. Each movable groove has a movable part slidably connected inside. The cleaning component is set on the top surface of the movable part. The cleaning component can change its posture as it moves away from the groove opening. The displacement component pushes the movable part to move.

7. The motor withstand voltage testing fixture according to claim 6, characterized in that, The cleaning assembly includes two elastic cleaning plates. Cleaning brushes are provided on the side surfaces of the elastic cleaning plates. The bottom of both elastic cleaning plates is integrally formed with protrusions, and the protrusions are inserted into a slot opened on the top surface of the movable part. A damping spring is provided in the slot, and the two protrusions are connected by the damping spring.

8. The motor withstand voltage testing fixture according to claim 6, characterized in that, The displacement assembly includes a pusher. A swing groove is provided on the measuring platform for the pusher to move. The pusher is hinged in the swing groove by a torsion spring. The swing groove is connected to the movable groove. A column is fixedly installed at the bottom of the mounting plate. The column is inserted into the swing groove. When the mounting plate moves into the groove, it simultaneously drives the column to squeeze one end of the pusher, causing the pusher to deflect and the other end of the pusher to push the movable part to one side.

9. A method for testing the withstand voltage of an electric motor, using the electric motor withstand voltage testing fixture as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: Place the motor in the groove of the testing table; S2: Start the electric actuator to drive the frame to move towards the motor. The inclined bottom wall of the slot on the frame pushes the inclined plug into the groove to slide and press the motor stator from the side to complete the clamping. At the same time, start the pneumatic telescopic column to push the mounting plate and electrode assembly along the linear guide rail towards the motor terminal. S3: When the array of protrusions on the electrode contact structure initially contacts the terminal block, the pneumatic telescopic column is activated according to the feedback signal of the pressure sensor, driving the mounting plate to continue moving forward until the contact pressure reaches the preset value. S4: Perform a withstand voltage test on the motor using a leakage current sensor; S5: After the test is completed, the pneumatic telescopic column retracts, the electric push rod drives the frame to reset, the electrode assembly and the inclined plug retract under the action of the reset spring, and the motor is released.

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