Permanent magnet synchronous motor testing device and method

Abstract

The application belongs to the technical field of motor testing and relates to a permanent magnet synchronous motor testing device and method, which 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 the locking caliper is rotatably connected with the support plate through a rotating shaft. The input end of the encoder is connected with the rotating shaft. The rotating shaft is drivingly connected with the load mechanism through the connecting mechanism. The adjusting mechanism comprises an upper pressing rod. The middle part of the upper pressing rod is hingedly connected with the support. The middle part of the lower pressing rod is hingedly connected with the base. The two ends of the electric telescopic rod are rotatably connected with the upper pressing rod and the lower pressing rod respectively. The upper pressing rod and the lower pressing rod are used for providing pressure to the two ends of the load mechanism. The locking caliper is always fixedly connected with the output end of the permanent magnet motor during rotation and applies different loads through the load mechanism. The rotating center of the locking caliper can always rotate coaxially with the output end of the permanent magnet synchronous motor, thereby improving the stability of the permanent magnet synchronous motor during the testing process and preventing shaking.

Description

Technical Field

[0001] This invention relates to the field of motor testing technology, and in particular to a testing device and method for permanent magnet synchronous motors. Background Technology

[0002] The required speed of motors varies in different equipment. During the motor production process, component mismatch and other issues can lead to substandard speeds and motor overheating, affecting product quality. Permanent magnet synchronous motors need to undergo performance testing before leaving the factory, but this usually involves testing for no-load back EMF, back EMF harmonics, and no-load speed, with less testing of motor performance under different loads.

[0003] Chinese patent document CN117289128A discloses a testing device and method for an external rotor permanent magnet synchronous motor. The testing device includes a base plate, with a hydraulic rod and a guide rail mounted on one top end. A sliding plate is slidably fitted onto the outside 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 sliding plate are slidably fitted onto the outside of the guide rail together. However, this patent still has some shortcomings: when the external rotor of the motor rotates, it transmits power through friction with steel balls or rubber wheels. During high-load testing of the motor, the rotor experiences significant force, and slippage between the external rotor and the steel balls or rubber wheels can cause asynchronous speeds. This can also cause wear on the motor, steel balls, and rubber wheels, 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 of difficulty in applying different loads during the testing process of permanent magnet synchronous motors, the present invention provides a permanent magnet synchronous motor testing device and method to solve the above problem.

[0005] The technical solution adopted by this invention to solve its technical problem is: a permanent magnet synchronous motor testing device and method, including a base and a bracket vertically fixed on the base, and further including a positioning seat, a connecting mechanism, a transmission mechanism, a load mechanism and an adjusting mechanism. The positioning seat is installed on the base for fixing the permanent magnet synchronous motor. The connecting mechanism includes a locking caliper, a support plate and a rotating shaft. The support plate is fixed on the bracket. The top of the locking caliper is rotatably connected to the support plate through the rotating shaft. An encoder is also fixed on 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 transmittedly connected to the load mechanism through the connecting mechanism. The adjusting mechanism includes 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 rotatably connected to the upper pressure rod and the lower pressure rod, respectively. 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. 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 further includes a bottom telescopic rod, a bottom connecting rod, a top telescopic rod, and a top connecting rod. The bottom telescopic rod is fixed to the base, the bottom connecting rod is fixedly connected to the movable end of the bottom telescopic rod, the end of the lowering rod is horizontally slidably connected to the bottom connecting rod, the top telescopic rod is fixed to 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 pressing 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 primary load plate, a secondary load plate, a tertiary 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 mounted on the bottom rotating seat. The bottom center of the primary 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 tertiary load plate. A through hole is provided in the center of the tertiary load plate. 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 secondary load plate. The primary, secondary, and tertiary load plates are located on the same axis.

[0008] Preferably, the diameters of the primary load cell, secondary load cell, and tertiary load cell increase sequentially from bottom to top.

[0009] Preferably, the locking caliper includes a locking screw, a locking sleeve, a hinge seat, and two mirror-symmetrically arranged claws. The upper end of the locking screw is fixedly connected to the rotating shaft coaxially, and the lower end of the locking screw is fixedly connected to the hinge seat. The two claws are rotatably connected to the hinge seat. The locking sleeve is threadedly connected to the locking screw, and the lower end of the locking sleeve slides against the outer side of the claws. Each claw also has an arc-shaped locking block hinged to its lower end.

[0010] Preferably, a reinforcing ring is also 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 and is slidably connected to the driven gear along the axial direction. The driven gear can drive the support rod to rotate. The toothed belt is sleeved on the driving gear and the driven gear.

[0012] Preferably, the positioning base includes two mirror-symmetrically arranged clamping plates, each clamping plate having a slot for accommodating the permanent magnet synchronous motor, and the base having a sliding groove, the clamping plates being slidably installed in the sliding groove, and both ends of the clamping plates being threadedly connected with locking screws for locking the clamping plates.

[0013] A method for testing a permanent magnet synchronous motor, comprising the aforementioned permanent magnet synchronous motor testing device, and further comprising the following steps: S1, mounting the permanent magnet synchronous motor on a positioning base and connecting it to a power supply; S2, clamping the output end of the permanent magnet synchronous motor with locking calipers; S3, starting the permanent magnet synchronous motor and detecting its speed in real time using an encoder; S4, adjusting the load mechanism to make the secondary load plate of the load mechanism fit with the primary load plate, thereby increasing the load on the permanent magnet synchronous motor; S5, adjusting the load mechanism to make the secondary load plate of the load mechanism fit with the tertiary load plate, thereby further increasing the load on the permanent magnet synchronous motor; S6, adjusting the load mechanism to separate the primary load plate from the secondary load plate and shutting off the permanent magnet synchronous motor, thus completing 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 when rotating, avoiding slippage and 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, improving the stability of the permanent magnet synchronous motor during the test and preventing vibration.

[0015] Secondly, the primary, secondary, and tertiary load disks can not only apply loads of different sizes to the permanent magnet synchronous motor, but also simulate the situation of sudden load increase. Furthermore, the primary, secondary, and tertiary load disks do not generate sliding friction with each other during the test, avoiding wear of parts and improving the overall service life and test accuracy of the device. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the optimal embodiment of the permanent magnet synchronous motor testing device of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the pressure rod of the permanent magnet synchronous motor testing device of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the locking sleeve of the permanent magnet synchronous motor testing device of the present invention;

[0020] Figure 4 This is a schematic diagram of the locking screw of a permanent magnet synchronous motor testing device according to the present invention;

[0021] Figure 5 This is a schematic diagram of the three-stage load disk of a permanent magnet synchronous motor testing device according to the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the secondary load disk of a permanent magnet synchronous motor testing device according to the present invention.

[0023] Reference numerals: 1. Base; 2. Bracket; 3. Positioning seat; 4. Locking caliper; 5. Transmission mechanism; 6. Load mechanism; 7. Adjustment mechanism; 8. Support plate; 9. Rotating shaft; 10. Encoder; 11. Upper pressure rod; 12. Lower pressure rod; 13. Electric telescopic rod; 14. Bottom telescopic rod; 15. Bottom connecting rod; 16. Top telescopic rod; 17. Top connecting rod; 18. Bottom rotating seat; 19. Support rod; 20. Primary load plate; 21. Secondary load plate; 22. Tertiary load plate; 23. Spring seat; 24. Elastic telescopic rod; 25. Locking screw; 26. Locking sleeve; 27. Hinge seat; 28. Claw head; 29. ​​Arc-shaped locking block; 30. Reinforcing ring; 31. Driving gear; 32. Driven gear; 33. Toothed belt; 34. Locking plate; 35. Locking groove; 36. Slide groove; 37. Locking screw. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] like Figures 1 to 6 As shown, this invention provides an embodiment of a permanent magnet synchronous motor testing device and method, including a base 1 and a bracket 2 vertically fixed on the base 1, as well as 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 to fix 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 through the rotating shaft 9. The transmission mechanism 5 includes 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 installed on the support plate 8. A support rod 19 passes through the center of the driven gear 32. The support rod 19 and the driven gear 32 are slidably connected axially. 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. Using the toothed belt 33 to connect the driving gear 31 and the driven gear 32 can avoid slippage and effectively improve the testing accuracy.

[0026] The locking caliper 4 includes a locking screw 25, a locking sleeve 26, a hinge seat 27, and two mirror-symmetrically arranged claws 28. The upper end of the locking screw 25 is coaxially and fixedly connected to the rotating shaft 9, and the lower end of the locking screw 25 is fixedly connected to the hinge seat 27. The two claws 28 are rotatably connected to the hinge seat 27. The locking sleeve 26 is threadedly connected to the locking screw 25. The lower end of the locking sleeve 26 slides 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 contact point between the locking sleeve 26 and the outer side of the claw 28 and prevent fatigue deformation of the lower edge of the locking sleeve 26. An arc-shaped locking block 29 is also hinged to the lower end of each claw 28.

[0027] The working principle of the locking caliper 4 is as follows: the output end of the permanent magnet synchronous motor is placed between two arc-shaped clamping 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, it can push the two claws 28 that abut against it to rotate downward around the hinge seat 27, so that the two arc-shaped clamping blocks 29 move closer to each other and complete the clamping action. The locking sleeve 26 always maintains a fixed connection with the output end of the permanent magnet motor when rotating, avoiding slippage and wear between the two. Since the locking sleeve is circular and the two claws 28 are mirror-symmetrically arranged, 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, improving the stability of the permanent magnet synchronous motor during the test and preventing vibration.

[0028] 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 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 the connecting mechanism.

[0029] The adjustment 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 rotatably connected to the upper pressure rod 11 and the lower pressure rod 12, respectively. 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.

[0030] The adjustment 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. 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.

[0031] The load mechanism 6 includes a bottom rotating seat 18, a support rod 19, a primary load plate 20, a secondary load plate 21, a tertiary load plate 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 primary load plate 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 other end is rotatably connected to the third-stage load disk 22. The third-stage load disk 22 has a through hole in its center. 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 second-stage 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 in order to apply different loads to the permanent magnet synchronous motor.

[0032] During load testing, the output end of the permanent magnet synchronous motor is first connected via locking caliper 4. Then, locking caliper 4 and shaft 9 rotate, driving support rod 19 to rotate via transmission mechanism 5. Support rod 19 drives primary load disk 20 to rotate, at which point the load on the permanent magnet synchronous motor is at its minimum. When the load needs to be increased, the electric telescopic rod 13 of adjustment mechanism 7 is activated, extending the electric telescopic rod 13. The electric telescopic rod 13, through upper pressure rod 11 and lower pressure rod 12, pushes the primary load disk 20 and secondary load disk 21 closer together until they are in contact, causing the secondary load disk 21 to rotate with the primary load disk 20. At this time, elastic telescopic rod 24 acts as a buffer, cushioning the impact generated when the primary load disk 20 and secondary load disk 21 come into contact, thus increasing the load on the permanent magnet synchronous motor. When a further increase in load is needed, the electric telescopic rod 13 continues to extend, and the upper pressure rod 11 and lower pressure rod 12 continue to push... The secondary load plate 21 and the tertiary load plate 22 approach each other until they are pressed together, further increasing the load on the permanent magnet synchronous motor. At this time, the elastic telescopic rod 24 is in a compressed state and the impact generated when the secondary load plate 21 and the tertiary load plate 22 come into contact is buffered by the spring seat 23. When the primary load plate 20 moves, it is guided by the bottom telescopic rod 14. When the secondary load plate 21 and the tertiary load plate 22 move, they are guided by the top telescopic rod 16 to prevent tilting during movement. The primary load plate 20, the secondary load plate 21 and the tertiary load plate 22 can not only apply different loads to the permanent magnet synchronous motor, but also simulate the situation of sudden load increase. Furthermore, the primary load plate 20, the secondary load plate 21 and the tertiary load plate 22 will not slide against each other during the test, avoiding wear of parts and improving the overall service life and test accuracy of the device.

[0033] The positioning base 3 includes two mirror-symmetrically arranged clamping plates 34. The clamping plates 34 have slots 35 for accommodating permanent magnet synchronous motors. The base 1 has a sliding groove 36. The clamping plates 34 are slidably installed in the sliding groove 36. The two ends of the clamping plates 34 are also threaded with locking screws 37 for locking the clamping plates 34.

[0034] A method for testing a permanent magnet synchronous motor includes the aforementioned permanent magnet synchronous motor testing device, and further includes the following steps: S1, installing the permanent magnet synchronous motor on the positioning base 3 and connecting it to a power source; S2, clamping the output end of the permanent magnet synchronous motor with locking clamps 4; S3, starting the permanent magnet synchronous motor and detecting its speed in real time using an encoder 10; S4, controlling the secondary load plate 21 of the load mechanism 6 to contact the primary load plate 20 through the adjustment mechanism 7, thereby increasing the load on the permanent magnet synchronous motor; S5, controlling the secondary load plate 21 of the load mechanism 6 to contact the tertiary load plate 22 through the adjustment mechanism 7, thereby further increasing the load on the permanent magnet synchronous motor; S6, controlling the primary load plate 20 of the load mechanism 6 to separate from the secondary load plate 21 and shutting off the permanent magnet synchronous motor through the adjustment mechanism 7, thus completing the test.

[0035] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions 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 one or more embodiments or examples.

[0036] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but 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 on the base (1), characterized in that: It also includes a positioning seat (3), a connecting mechanism, a transmission mechanism (5), a load mechanism (6), and an adjusting mechanism (7). The positioning seat (3) is mounted on the base (1) to fix 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) through 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. The shaft (9) is connected to the load mechanism (6) via 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), 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 rotatably connected to the upper pressure rod (11) and the lower pressure rod (12) respectively. 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). The adjustment mechanism (7) further 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). The bottom connecting rod (15) is fixedly connected to the movable end of the bottom telescopic rod (14). The end of the lowering 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 pressing 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). The load mechanism (6) includes a bottom rotating seat (18), a support rod (19), a primary load plate (20), a secondary load plate (21), a tertiary load plate (22), a spring seat (23), and an elastic telescopic rod (24). 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 primary load plate (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 connected to the support plate (8). 8) Rotary connection: one end of the spring seat (23) is fixed on the top connecting rod (17), and the other end of the spring seat (23) is rotatably connected to the third-stage load disk (22). The third-stage load disk (22) has a through hole in its center. One end of the elastic telescopic rod (24) is fixed to the center of the spring seat (23), and the other end of the elastic telescopic rod (24) passes through the through hole and is rotatably connected to the center of the second-stage 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.

2. The permanent magnet synchronous motor testing device according to claim 1, characterized in that: The diameters of the primary load cell (20), secondary load cell (21), and tertiary load cell (22) increase sequentially from bottom to top.

3. The permanent magnet synchronous motor testing device according to claim 2, characterized in that: The locking caliper (4) includes a locking screw (25), a locking sleeve (26), a hinge seat (27), and two mirror-symmetrically arranged claws (28). The upper end of the locking screw (25) is coaxially fixedly connected to the rotating shaft (9), and the lower end of the locking screw (25) is fixedly connected to the hinge seat (27). The two claws (28) are rotatably connected to the hinge seat (27). The locking sleeve (26) is threadedly connected to the locking screw (25). The lower end of the locking sleeve (26) slides against the outer side of the claw (28). Each claw (28) is also hinged with an arc-shaped locking block (29) at its lower end.

4. The permanent magnet synchronous motor testing device according to claim 3, characterized in that: A reinforcing ring (30) is also fixed to the outer edge of the lower end of the locking sleeve (26).

5. The permanent magnet synchronous motor testing device according to claim 1, characterized in that: The transmission mechanism (5) includes 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) and the driven gear (32) are axially slidably connected. 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).

6. The permanent magnet synchronous motor testing device according to claim 1, characterized in that: The positioning base (3) includes two mirror-symmetrically arranged card plates (34). The card plates (34) have slots (35) for accommodating the permanent magnet synchronous motor. The base (1) has a sliding groove (36). The card plates (34) are slidably installed in the sliding groove (36). Both ends of the card plates (34) are also threaded with locking screws (37) for locking the card plates (34).

7. A testing method for a permanent magnet synchronous motor, characterized in that, The permanent magnet synchronous motor testing device as described in any one of claims 2 to 6 further includes the following steps: S1. Install the permanent magnet synchronous motor on the positioning seat (3) and connect it to the power supply; S2. Clamp the output end of the permanent magnet synchronous motor with locking calipers (4); S3. Start the permanent magnet synchronous motor and detect the speed of the permanent magnet synchronous motor in real time through the encoder (10); S4. By adjusting the mechanism (7), the secondary load disk (21) of the load mechanism (6) is made to fit with the primary load disk (20) to increase the load of the permanent magnet synchronous motor. S5. By adjusting the mechanism (7), the secondary load disk (21) of the load mechanism (6) is made to fit with the tertiary load disk (22), thereby increasing the load of the permanent magnet synchronous motor again. S6. By adjusting the mechanism (7), the first-stage load disk (20) and the second-stage load disk (21) of the load mechanism (6) are separated and the permanent magnet synchronous motor is turned off to complete the test.

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