Permanent magnet synchronous motor testing device and method

Abstract

The invention belongs to the technical field of motor testing, and relates to a permanent magnet synchronous motor testing device and method.The permanent magnet synchronous motor testing device comprises a base, a support, a positioning seat, a connecting mechanism, a transmission mechanism, a load mechanism and an adjusting mechanism, the positioning seat is installed on the base, the top of locking calipers is rotationally connected with a supporting plate through a rotating shaft, and the input end of an encoder is connected with the rotating shaft; the adjusting mechanism comprises an upper pressing rod, the middle of the upper pressing rod is hinged to the support, the middle of a lower pressing rod is hinged to the base, the two ends of an electric telescopic rod are rotationally connected with the upper pressing rod and the lower pressing rod respectively, and the upper pressing rod and the lower pressing rod are used for providing pressure for the two ends of the load mechanism. The locking calipers are fixedly connected with the output end of the permanent magnet motor all the time during rotation, different loads are applied through the load mechanism, the rotation center of the locking calipers can keep coaxial rotation with the output end of the permanent magnet synchronous motor all the time, the stability of the permanent magnet synchronous motor in the testing process is improved, and shaking is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of motor testing, and in particular to a permanent magnet synchronous motor testing device and method. Background Art

[0002] The motor speed requirements vary across various devices. During the motor production process, component mismatching can lead to speed failures, motor overheating, and other issues, impacting product quality. Permanent magnet synchronous motors must undergo performance testing before leaving the factory. However, these tests typically focus on no-load back EMF, back EMF harmonics, and no-load speed. Motor performance under different loads is rarely tested.

[0003] Chinese patent document CN117289128A discloses an outer rotor permanent magnet synchronous motor testing device and method, including an outer rotor permanent magnet synchronous motor testing device and method, wherein the outer rotor permanent magnet synchronous motor testing device includes a base plate, a hydraulic rod and a guide rail are mounted on one end of the top of the base plate, a sliding plate is slidably sleeved on the outer portion of the guide rail, a mounting plate is fixedly connected to the side of the sliding plate near the hydraulic rod, and the mounting plate and the sliding plate are slidably sleeved on the outer portion of the slide rail. However, this patent still has some shortcomings: when the outer rotor of the motor rotates, it transmits the power through friction with the steel ball or rubber wheel. When the motor is subjected to high load testing, the motor rotor is subjected to large forces, and the outer rotor and the steel ball or rubber wheel will slip, resulting in asynchronous rotation speed. It will also cause wear to the motor, steel ball and rubber wheel, further affecting the accuracy of the data. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that it is difficult to apply different loads for testing during the testing process of a permanent magnet synchronous motor, the present invention provides a permanent magnet synchronous motor testing device and method to solve the above problem.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a permanent magnet synchronous motor testing device and method, comprising a base and a bracket vertically fixed to the base, and also comprising a positioning seat, a connecting mechanism, a transmission mechanism, a load mechanism and an adjustment mechanism, wherein the positioning seat is installed on the base for fixing the permanent magnet synchronous motor, the connecting mechanism comprises a locking caliper, a support plate and a rotating shaft, the support plate is fixed to the bracket, the top of the locking caliper is rotatably connected to the support plate via the rotating shaft, an encoder is also fixed to the bracket, the input end of the encoder is connected to the rotating shaft, the lower end of the locking caliper is used to clamp the output end of the permanent magnet synchronous motor, the rotating shaft is transmission-connected to the load mechanism via the connecting mechanism, the adjustment mechanism comprises an upper pressure rod, a lower pressure rod and an electric telescopic rod, the middle part of the upper pressure rod is hinged to the bracket, the middle part of the lower pressure rod is hinged to the base, the two ends of the electric telescopic rod are respectively rotatably connected to the upper pressure rod and the lower pressure rod, the other ends of the upper pressure rod and the lower pressure rod are respectively connected to the upper and lower ends of the load mechanism, and the upper pressure rod and the lower pressure rod are used to provide pressure to the two ends of the load mechanism.

[0006] Preferably, the adjustment mechanism also includes a bottom telescopic rod, a bottom connecting rod, a top telescopic rod and a top connecting rod, the bottom telescopic rod is fixed on the base, the bottom connecting rod is fixedly connected to the movable end of the bottom telescopic rod, the end of the lower pressure rod is horizontally slidably connected to the bottom connecting rod, the top telescopic rod is fixed on the bracket and is located on the same axis as the bottom telescopic rod, the top connecting rod is fixedly connected to the movable end of the top telescopic rod, the end of the upper pressure rod is horizontally slidably connected to the top connecting rod, and the bottom connecting rod and the top connecting rod are respectively connected to the upper and lower ends of the load mechanism.

[0007] Preferably, the load mechanism includes a bottom rotating seat, a support rod, a first-level load plate, a second-level load plate, a third-level load plate, a spring seat and an elastic telescopic rod, the bottom rotating seat is fixed to the bottom connecting rod, one end of the support rod is rotatably installed on the bottom rotating seat, the bottom center of the first-level load plate is fixedly connected to the other end of the support rod, the support rod passes through the support plate and is rotatably connected to the support plate, one end of the spring seat is fixed to the top connecting rod, the other end of the spring seat is rotatably connected to the third-level load plate, the center of the third-level load plate is provided with a through hole, one end of the elastic telescopic rod is fixed to the center of the spring seat, the other end of the elastic telescopic rod passes through the through hole and is rotatably connected to the center of the second-level load plate, the first-level load plate, the second-level load plate and the third-level load plate are located on the same axis.

[0008] Preferably, the diameters of the first-stage load plate, the second-stage load plate and the third-stage load plate increase sequentially from bottom to top.

[0009] Preferably, the locking caliper includes a locking screw, a locking sleeve, an articulated seat and two claws arranged in a mirror-symmetrical manner. The upper end of the locking screw is coaxially fixedly connected to the rotating shaft, the lower end of the locking screw is fixedly connected to the articulated seat, the two claws are rotatably connected to the articulated seat, the locking sleeve is threadedly connected to the locking screw, and the lower end of the locking sleeve is in sliding contact with the outer side of the claw, and the lower end of each claw is also hinged with an arc-shaped block.

[0010] Preferably, a reinforcement ring is fixed to the outer edge of the lower end of the locking sleeve.

[0011] Preferably, the transmission mechanism includes a driving gear, a driven gear and a toothed belt, the driving gear is coaxially and fixedly connected to the rotating shaft, the driven gear is rotatably mounted on the support plate, the support rod passes through the center of the driven gear, the support rod and the driven gear are axially slidably connected, the driven gear can drive the support rod to rotate, and the toothed belt is sleeved on the driving gear and the driven gear.

[0012] Preferably, the positioning seat includes two mirror-symmetrically arranged card plates, each card plate is provided with a card slot for accommodating the permanent magnet synchronous motor, and the base is provided with a slide slot, the card plate is slidably installed in the slide slot, and both ends of the card plate are also threadedly connected with locking screws for locking the card plate.

[0013] A permanent magnet synchronous motor testing method includes the above-mentioned permanent magnet synchronous motor testing device, and further includes the following steps: S1, mounting the permanent magnet synchronous motor on a positioning seat and connecting the power supply; S2, clamping the output end of the permanent magnet synchronous motor by a locking caliper; S3, starting the permanent magnet synchronous motor and detecting the rotation speed of the permanent magnet synchronous motor in real time by an encoder; S4, controlling the secondary load disc of the load mechanism to fit with the primary load disc by an adjusting mechanism, thereby increasing the load of the permanent magnet synchronous motor; S5, controlling the secondary load disc of the load mechanism to fit with the tertiary load disc by an adjusting mechanism, thereby increasing the load of the permanent magnet synchronous motor again; S6, controlling the primary load disc of the load mechanism to separate from the secondary load disc by an adjusting mechanism, and shutting down the permanent magnet synchronous motor to complete the test.

[0014] The beneficial effects of the present invention are as follows: first, the locking caliper always maintains a fixed connection with the output end of the permanent magnet motor during rotation, thereby preventing slip wear between the two. When the locking caliper rotates with the output end of the permanent magnet synchronous motor, its rotation center can always maintain coaxial rotation with the output end of the permanent magnet synchronous motor, thereby improving the stability of the permanent magnet synchronous motor during testing and preventing jitter. Secondly, the first-level load plate, the second-level load plate and the third-level load plate can not only apply loads of different sizes to the permanent magnet synchronous motor, but also simulate the situation of sudden load increase. Moreover, during the test process, the first-level load plate, the second-level load plate and the third-level load plate will not generate sliding friction with each other, thus avoiding wear of parts and improving the overall service life and test accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural schematic diagram of a preferred embodiment of a permanent magnet synchronous motor testing device of the present invention; Figure 2 This is a structural schematic diagram of a lower pressure rod of a permanent magnet synchronous motor testing device of the present invention; Figure 3 It is a structural schematic diagram of a locking sleeve of a permanent magnet synchronous motor testing device of the present invention; Figure 4 It is a structural schematic diagram of a locking screw of a permanent magnet synchronous motor testing device of the present invention; Figure 5 This is a structural schematic diagram of a three-stage load disk of a permanent magnet synchronous motor testing device of the present invention; Figure 6 It is a structural schematic diagram of a secondary load disk of a permanent magnet synchronous motor testing device of the present invention.

[0017] 1. The cam is provided with a plurality of connecting rods, a plurality of connecting rods and a plurality of connecting rods, and a plurality of connecting rods are provided with respective guide rails, a plurality of connecting rods and a plurality of connecting rods. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figures 1 to 6 As shown, the present invention provides an embodiment of a permanent magnet synchronous motor testing device and method, comprising a base 1 and a bracket 2 vertically fixed on the base 1, and also comprising a positioning seat 3, a connecting mechanism, a transmission mechanism 5, a load mechanism 6 and an adjustment mechanism 7. The positioning seat 3 is installed on the base 1 for fixing the permanent magnet synchronous motor, the connecting mechanism comprises a locking caliper 4, a support plate 8 and a rotating shaft 9, the support plate 8 is fixed on the bracket 2, the top of the locking caliper 4 is rotatably connected to the support plate 8 through the rotating shaft 9, the transmission mechanism 5 comprises a driving gear 31, a driven gear 32 and a toothed belt 33, the driving gear 31 is coaxially fixedly connected to the rotating shaft 9, the driven gear 32 is rotatably mounted on the support plate 8, the support rod 19 passes through the center of the driven gear 32, the support rod 19 is axially slidably connected to the driven gear 32, and the driven gear 32 can drive the support rod 19 to rotate, the toothed belt 33 is sleeved on the driving gear 31 and the driven gear 32, and the toothed belt 33 is used to connect the driving gear 31 and the driven gear 32, which can avoid slipping and effectively improve the test accuracy.

[0020] The locking caliper 4 includes a locking screw 25, a locking sleeve 26, an articulated seat 27 and two claws 28 arranged in a mirror-symmetrical manner. The upper end of the locking screw 25 is coaxially fixedly connected to the rotating shaft 9, the lower end of the locking screw 25 is fixedly connected to the articulated seat 27, the two claws 28 are rotatably connected to the articulated seat 27, the locking sleeve 26 is threadedly connected to the locking screw 25, and the lower end of the locking sleeve 26 is slidingly abutted against the outer side of the claw 28. A reinforcing ring 30 is also fixed to the outer edge of the lower end of the locking sleeve 26 to reinforce the abutment between the locking sleeve 26 and the outer side of the claw 28 to prevent fatigue deformation of the lower edge of the locking sleeve 26. The lower end of each claw 28 is also hinged with an arc-shaped block 29.

[0021] The working principle of the locking caliper 4 is: the output end of the permanent magnet synchronous motor is placed between the two arc-shaped blocks 29, and then the locking sleeve 26 is rotated to move the locking sleeve 26 downward. During the downward movement of the locking sleeve 26, the two claws 28 abutting against it can be pushed to rotate downward with the hinge seat 27 as the center, so that the two arc-shaped blocks 29 are close to each other to complete the clamping action. The locking sleeve 26 always maintains a fixed connection with the output end of the permanent magnet motor during rotation to avoid slippage and wear between the two. Since the locking sleeve sleeve is circular and the two claws 28 are arranged in mirror symmetry, when the locking caliper 4 rotates with the output end of the permanent magnet synchronous motor, its rotation center can always maintain coaxial rotation with the output end of the permanent magnet synchronous motor, thereby improving the stability of the permanent magnet synchronous motor during the test and preventing jitter.

[0022] An encoder 10 is also fixed on the bracket 2. The input end of the encoder 10 is connected to the rotating shaft 9 to detect the rotation speed of the permanent magnet synchronous motor. The lower end of the locking caliper 4 is used to clamp the output end of the permanent magnet synchronous motor. The rotating shaft 9 is connected to the load mechanism 6 through a connecting mechanism.

[0023] The adjusting mechanism 7 includes an upper pressure rod 11, a lower pressure rod 12 and an electric telescopic rod 13. The middle part of the upper pressure rod 11 is hinged to the bracket 2, and the middle part of the lower pressure rod 12 is hinged to the base 1. The two ends of the electric telescopic rod 13 are respectively rotatably connected to the upper pressure rod 11 and the lower pressure rod 12. The other ends of the upper pressure rod 11 and the lower pressure rod 12 are respectively connected to the upper and lower ends of the load mechanism 6. The upper pressure rod 11 and the lower pressure rod 12 are used to provide pressure to the two ends of the load mechanism 6.

[0024] The adjusting mechanism 7 also includes a bottom telescopic rod 14, a bottom connecting rod 15, a top telescopic rod 16 and a top connecting rod 17. The bottom telescopic rod 14 is fixed on the base 1, and the bottom connecting rod 15 is fixedly connected to the movable end of the bottom telescopic rod 14. The end of the lower pressure rod 12 is horizontally slidably connected to the bottom connecting rod 15. The top telescopic rod 16 is fixed on the bracket 2 and is located on the same axis as the bottom telescopic rod 14. The top connecting rod 17 is fixedly connected to the movable end of the top telescopic rod 16. The end of the upper pressure rod 11 is horizontally slidably connected to the top connecting rod 17. The bottom connecting rod 15 and the top connecting rod 17 are respectively connected to the upper and lower ends of the load mechanism 6.

[0025] The load mechanism 6 includes a bottom rotating seat 18, a support rod 19, a first-level load disc 20, a second-level load disc 21, a third-level load disc 22, a spring seat 23 and an elastic telescopic rod 24. The bottom rotating seat 18 is fixed to the bottom connecting rod 15. One end of the support rod 19 is rotatably mounted on the bottom rotating seat 18. The bottom center of the first-level load disc 20 is fixedly connected to the other end of the support rod 19. The support rod 19 passes through the support plate 8 and is rotatably connected to the support plate 8. One end of the spring seat 23 is fixed to the top connecting rod 17. The spring seat 23 The other end is rotatably connected to the third-stage load disk 22. A through hole is provided in the center of the third-stage load disk 22. One end of the elastic telescopic rod 24 is fixed to the center of the spring seat 23. The other end of the elastic telescopic rod 24 passes through the through hole and is rotatably connected to the center of the secondary load disk 21. The first-stage load disk 20, the second-stage load disk 21 and the third-stage load disk 22 are located on the same axis. The diameters of the first-stage load disk 20, the second-stage load disk 21 and the third-stage load disk 22 increase from bottom to top, so as to apply loads of different sizes to the permanent magnet synchronous motor.

[0026] When conducting a load test, first connect the output end of the permanent magnet synchronous motor through the locking caliper 4, then the locking caliper 4 and the rotating shaft 9 rotate and drive the support rod 19 to rotate through the transmission mechanism 5, and the support rod 19 drives the first-level load disk 20 to rotate. At this time, the load of the permanent magnet synchronous motor is the smallest. When the load needs to be increased, the electric telescopic rod 13 of the adjustment mechanism 7 is started to extend the electric telescopic rod 13. The electric telescopic rod 13 pushes the first-level load disk 20 and the second-level load disk 21 close to each other through the upper pressure rod 11 and the lower pressure rod 12 until they are fitted together, so that the second-level load disk 21 rotates with the first-level load disk 20. At this time, the elastic telescopic rod 24 has a buffering effect, which buffers the impact generated when the first-level load disk 20 and the second-level load disk 21 contact, thereby increasing the load for the permanent magnet synchronous motor. When the load needs to be further increased, continue to extend the electric telescopic rod 13 and continue to push through the upper pressure rod 11 and the lower pressure rod 12 The secondary load disc 21 and the tertiary load disc 22 are close to each other until they fit together, further increasing the load of the permanent magnet synchronous motor. At this time, the elastic telescopic rod 24 is in a compressed state, and the spring seat 23 is used to buffer the impact generated when the secondary load disc 21 and the tertiary load disc 22 contact each other. When the primary load disc 20 moves, it is guided by the bottom telescopic rod 14, and when the secondary load disc 21 and the tertiary load disc 22 move, they are guided by the top telescopic rod 16 to prevent tilting during movement. The primary load disc 20, the secondary load disc 21 and the tertiary load disc 22 can not only apply loads of different sizes to the permanent magnet synchronous motor, but also simulate the situation of a sudden increase in load. During the test, the primary load disc 20, the secondary load disc 21 and the tertiary load disc 22 will not generate sliding friction with each other, thereby avoiding wear of parts and improving the overall service life and test accuracy of the device.

[0027] The positioning seat 3 includes two mirror-symmetrically arranged card plates 34, each of which is provided with a card slot 35 for accommodating a permanent magnet synchronous motor. A slide slot 36 is provided on the base 1, and the card plate 34 is slidably installed in the slide slot 36. The two ends of the card plate 34 are also threadedly connected with locking screws 37 for locking the card plate 34.

[0028] A permanent magnet synchronous motor testing method includes the above-mentioned permanent magnet synchronous motor testing device, and further includes the following steps: S1, installing the permanent magnet synchronous motor on a positioning seat 3 and connecting it to a power supply; S2, clamping the output end of the permanent magnet synchronous motor by a locking caliper 4; S3, starting the permanent magnet synchronous motor and detecting the speed of the permanent magnet synchronous motor in real time by an encoder 10; S4, controlling the secondary load disk 21 of the load mechanism 6 to fit with the primary load disk 20 by an adjustment mechanism 7, thereby increasing the load of the permanent magnet synchronous motor; S5, controlling the secondary load disk 21 of the load mechanism 6 to fit with the tertiary load disk 22 by the adjustment mechanism 7, thereby increasing the load of the permanent magnet synchronous motor again; S6, controlling the primary load disk 20 and the secondary load disk 21 of the load mechanism 6 to separate by the adjustment mechanism 7 and turning off the permanent magnet synchronous motor to complete the test.

[0029] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0030] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A permanent magnet synchronous motor testing device, comprising a base (1) and a bracket (2) vertically fixed to the base (1), characterized in that: The invention also includes a positioning seat (3), a connecting mechanism, a transmission mechanism (5), a load mechanism (6) and an adjustment mechanism (7), wherein the positioning seat (3) is mounted on the base (1) for fixing the permanent magnet synchronous motor, the connecting mechanism includes a locking caliper (4), a support plate (8) and a rotating shaft (9), the support plate (8) is fixed on the bracket (2), the top of the locking caliper (4) is rotatably connected to the support plate (8) via the rotating shaft (9), an encoder (10) is also fixed on the bracket (2), the input end of the encoder (10) is connected to the rotating shaft (9), the lower end of the locking caliper (4) is used to clamp the output end of the permanent magnet synchronous motor, and the rotating shaft (9) is fixed to the bracket (2). The shaft (9) is connected to the load mechanism (6) through a connecting mechanism. The adjusting mechanism (7) includes an upper pressure rod (11), a lower pressure rod (12) and an electric telescopic rod (13). The middle part of the upper pressure rod (11) is hinged to the bracket (2), the middle part of the lower pressure rod (12) is hinged to the base (1), and the two ends of the electric telescopic rod (13) are respectively connected to the upper pressure rod (11) and the lower pressure rod (12). The other ends of the upper pressure rod (11) and the lower pressure rod (12) are respectively connected to the upper and lower ends of the load mechanism (6). The upper pressure rod (11) and the lower pressure rod (12) are used to provide pressure to the two ends of the load mechanism (6).

2. A permanent magnet synchronous motor testing device according to claim 1, characterized in that: The adjustment mechanism (7) further comprises a bottom telescopic rod (14), a bottom connecting rod (15), a top telescopic rod (16) and a top connecting rod (17), wherein the bottom telescopic rod (14) is fixed on the base (1), the bottom connecting rod (15) is fixedly connected to the movable end of the bottom telescopic rod (14), the end of the lower pressure rod (12) is horizontally slidably connected to the bottom connecting rod (15), the top telescopic rod (16) is fixed on the bracket (2) and is located on the same axis as the bottom telescopic rod (14), the top connecting rod (17) is fixedly connected to the movable end of the top telescopic rod (16), the end of the upper pressure rod (11) is horizontally slidably connected to the top connecting rod (17), and the bottom connecting rod (15) and the top connecting rod (17) are respectively connected to the upper and lower ends of the load mechanism (6).

3. A permanent magnet synchronous motor testing device according to claim 2, characterized in that: The load mechanism (6) comprises a bottom rotating seat (18), a support rod (19), a first-stage load plate (20), a second-stage load plate (21), a third-stage load plate (22), a spring seat (23) and an elastic telescopic rod (24), wherein the bottom rotating seat (18) is fixed on the bottom connecting rod (15), one end of the support rod (19) is rotatably mounted on the bottom rotating seat (18), the bottom center of the first-stage load plate (20) is fixedly connected to the other end of the support rod (19), and the support rod (19) passes through the support plate (8) and is connected to the support plate ( 8) Rotational connection, one end of the spring seat (23) is fixed on the top connecting rod (17), the other end of the spring seat (23) is rotationally connected to the three-stage load disk (22), a through hole is provided at the center of the three-stage load disk (22), one end of the elastic telescopic rod (24) is fixed at the center of the spring seat (23), the other end of the elastic telescopic rod (24) passes through the through hole and is rotationally connected to the center of the secondary load disk (21), and the first load disk (20), the second load disk (21) and the third load disk (22) are located on the same axis.

4. A permanent magnet synchronous motor testing device according to claim 3, characterized in that: The diameters of the first-stage load disc (20), the second-stage load disc (21), and the third-stage load disc (22) increase sequentially from bottom to top.

5. A permanent magnet synchronous motor testing device according to claim 4, characterized in that: The locking caliper (4) comprises a locking screw (25), a locking sleeve (26), an articulated seat (27) and two claw heads (28) arranged in a mirror-symmetrical manner. The upper end of the locking screw (25) is coaxially fixedly connected to the rotating shaft (9), the lower end of the locking screw (25) is fixedly connected to the articulated seat (27), the two claw heads (28) are rotatably connected to the articulated seat (27), the locking sleeve (26) is threadedly connected to the locking screw (25), the lower end of the locking sleeve (26) is in sliding contact with the outer side of the claw head (28), and the lower end of each claw head (28) is also hinged with an arc-shaped block (29).

6. A permanent magnet synchronous motor testing device according to claim 5, characterized in that: A reinforcement ring (30) is also fixed to the outer edge of the lower end of the locking sleeve (26).

7. A permanent magnet synchronous motor testing device according to claim 3, characterized in that: The transmission mechanism (5) includes a driving gear (31), a driven gear (32) and a toothed belt (33), wherein the driving gear (31) is coaxially fixedly connected to the rotating shaft (9), and the driven gear (32) is rotatably mounted on the support plate (8), the support rod (19) passes through the center of the driven gear (32), the support rod (19) and the driven gear (32) are axially slidably connected, and the driven gear (32) can drive the support rod (19) to rotate, and the toothed belt (33) is sleeved on the driving gear (31) and the driven gear (32).

8. The permanent magnet synchronous motor testing device according to claim 3, characterized in that: The positioning seat (3) includes two mirror-symmetrically arranged card plates (34), each of which is provided with a card slot (35) for accommodating the permanent magnet synchronous motor, and the base (1) is provided with a slide slot (36), the card plate (34) is slidably installed in the slide slot (36), and both ends of the card plate (34) are threadedly connected with locking screws (37) for locking the card plate (34).

9. A permanent magnet synchronous motor testing method, characterized in that: The permanent magnet synchronous motor testing device according to any one of claims 3 to 8 further comprises the following steps: S1, install the permanent magnet synchronous motor on the positioning seat (3) and connect the power supply; S2, clamping the output end of the permanent magnet synchronous motor by means of a locking caliper (4); S3, starting the permanent magnet synchronous motor and detecting the speed of the permanent magnet synchronous motor in real time through the encoder (10); S4, controlling the secondary load disc (21) of the load mechanism (6) to fit with the primary load disc (20) through the regulating mechanism (7), thereby increasing the load of the permanent magnet synchronous motor; S5, controlling the second-stage load disc (21) of the load mechanism (6) to fit with the third-stage load disc (22) through the regulating mechanism (7), thereby increasing the load of the permanent magnet synchronous motor again; S6. The first-stage load disc (20) and the second-stage load disc (21) of the load mechanism (6) are controlled to separate by the regulating mechanism (7) and the permanent magnet synchronous motor is turned off to complete the test.

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