A device for synchronously measuring back electromotive force coefficient and cogging torque of a motor

Abstract

The present invention discloses a device for synchronously measuring the back electromotive force coefficient and cogging torque of a motor. The servo motor is fixedly installed on a base plate, two ends of a torque sensor are respectively connected to the servo motor and a rotating shaft, a height adjustment structure is installed on the base plate, a clamping structure is installed on the height adjustment structure, a stator of the motor to be measured is fixed on the clamping structure, the height adjustment structure adjusts the center height of the stator of the motor to be measured so that the center height of the stator of the motor to be measured is consistent with the center height of the measuring device, a rotor of the motor to be measured is connected to the rotating shaft, the servo motor drives the rotor of the motor to be measured to rotate through the torque sensor and the rotating shaft, the rotor of the motor to be measured has the same speed as the servo motor and rotates evenly to obtain the back electromotive force coefficient, the torque sensor measures the total torque to obtain the cogging torque, two completely independent motor performance tests are integrated, and the measurement can be performed before the motor is fully assembled, unqualified parts can be replaced in time, and disassembly can be avoided.

Description

Technical Field

[0001] The invention relates to the field of motor testing, and in particular to a device for synchronously measuring a back electromotive force coefficient and a cogging torque of a motor. Background Art

[0002] The back-EMF coefficient of a permanent magnet synchronous motor is a unique performance parameter of the permanent magnet synchronous motor and is also a key parameter required for drive control. Currently, the back-EMF coefficient of a permanent magnet synchronous motor is tested by manually pulling the shaft after the motor is assembled, or by using a dedicated device to drive the motor. The former method has low accuracy in back-EMF coefficient testing because the speed of the hand-pulling cannot be uniform and it is difficult to make the motor speed reach the 1000r / min required by the national standard; the latter method requires a specially prepared device, and often due to differences in motor specifications, multiple specifications need to be prepared.

[0003] Cogging torque is also a unique external performance of permanent magnet synchronous motors. It is caused by the change in magnetic resistance between the rotor and the stator when the rotor rotates in different positions. Although the cogging torque does not do work, it brings torque pulsation and is reflected in the torque fluctuation of the motor, which ultimately affects the operating performance of the motor. Therefore, the cogging torque is also what motor manufacturers strive to suppress or eliminate. At present, some manufacturers have developed equipment specifically for measuring the cogging torque of permanent magnet synchronous motors, but the test object must be an assembled motor. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a device that can synchronously measure the back-electromotive force coefficient and cogging torque of a permanent magnet synchronous motor by integrating the two motor performance tests that were originally performed completely independently, based on the characteristics that both the back-electromotive force coefficient test and the cogging torque test of the permanent magnet synchronous motor require the rotor to rotate.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A device for synchronously measuring the back electromotive force coefficient and cogging torque of a motor comprises a base plate, a driving structure, a force measuring structure, a rotating shaft structure, a clamping structure and a height adjustment structure, wherein the driving structure comprises a servo motor, the servo motor is fixedly mounted on the base plate, the force measuring structure comprises a torque sensor, the rotating shaft structure comprises a rotating shaft, two ends of the torque sensor are respectively connected to the servo motor and the rotating shaft, the height adjustment structure is mounted on the base plate, the clamping structure is mounted on the height adjustment structure, the stator of the motor under test is fixed on the clamping structure, the height adjustment structure adjusts the center height of the stator of the motor under test so that the center height of the stator of the motor under test is consistent with the center height of the device for synchronously measuring the back electromotive force coefficient and cogging torque of the motor, the rotor of the motor under test is connected to the rotating shaft, the servo motor drives the rotor of the motor under test to rotate through the torque sensor and the rotating shaft, so that the rotor of the motor under test is consistent with the rotation speed of the servo motor and rotates evenly to obtain the back electromotive force coefficient, and the torque sensor measures the total torque to obtain the cogging torque.

[0007] Furthermore, the height adjustment structure includes an adjustment structure, a fine-tuning slide and an adjustment plate, the clamping structure includes a clamping seat, the fine-tuning slide is slidably connected to the adjustment structure, the adjustment plate is fixedly mounted on the fine-tuning slide, the clamping seat is fixedly mounted on the adjustment plate, and the adjustment structure drives the fine-tuning slide to move up and down so that the height of the clamping seat is adjusted.

[0008] Furthermore, the cross section of the fine-tuning slide plate is trapezoidal or triangular.

[0009] Furthermore, the adjustment structure includes a fine-tuning screw, a left fine-tuning nut, a right fine-tuning nut, a left fine-tuning slider and a right fine-tuning slider. The left fine-tuning nut and the right fine-tuning nut are respectively installed on the fine-tuning screw, the left fine-tuning slider and the right fine-tuning slider are respectively fixedly connected to the left fine-tuning nut and the right fine-tuning nut, and the fine-tuning slider is located between the left fine-tuning slider and the right fine-tuning slider.

[0010] Furthermore, the left fine-tuning slider and the right fine-tuning slider have a side facing the fine-tuning slide plate that is an inclined surface corresponding to the fine-tuning slide plate.

[0011] Furthermore, the height adjustment structure also includes a guide rail mounting plate, a linear guide pair and a side plate, the guide rail mounting plate is fixed to the side plate, the linear guide pair is installed on the guide rail mounting plate, and the left fine-tuning slider and the right fine-tuning slider are respectively fixed to the linear guide pair.

[0012] Furthermore, the side plate includes a dovetail guide rail, and the clamping structure also includes a dovetail slider. The dovetail slider is fixed to both ends of the clamp seat and is inserted into the dovetail guide rail so that the clamp seat is slidably installed on the side plate.

[0013] Furthermore, the height adjustment structure also includes two limiting parts, each limiting part includes a limiting plate and a limiting screw, the limiting plate is installed on the guide rail mounting plate, the limiting screw is fixed to the limiting plate, and the limiting part prevents the left fine-tuning slider and the right fine-tuning slider from sliding after the center height adjustment is completed.

[0014] Furthermore, the clamping seat is V-shaped.

[0015] Furthermore, the device for synchronously measuring the back electromotive force coefficient and cogging torque of the motor also includes a supporting structure, which includes a supporting bearing seat and a supporting bearing, the supporting bearing seat is installed on the base plate, and the supporting bearing is installed on the supporting bearing seat.

[0016] Compared with the prior art, the device for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor of the present invention has the following advantages:

[0017] (1) The present invention integrates the back-EMF coefficient test and the cogging torque test of the permanent magnet synchronous motor into a set of equipment. The two motor performance tests can be completed simultaneously at one time after only one installation, which greatly simplifies the test process, saves test time, and improves test efficiency.

[0018] (2) The present invention also overturns the test sequence of traditional permanent magnet synchronous motors, and advances the back-EMF coefficient test and cogging torque test, which previously had to be performed when the motor was in the complete state, to the stator and rotor component stage. In this way, the design or manufacturing defects of the stator and rotor can be discovered early, and it can even be separated whether it is a stator defect or a rotor defect. By effectively controlling the quality of the stator and rotor components in this way, the overall production efficiency of the motor is ultimately improved.

[0019] (3) The present invention has a wide range of applications and can test the back electromotive force coefficient and cogging torque of permanent magnet synchronous motors of almost all specifications;

[0020] (4) The present invention can also test motors with square or other irregular shapes. By changing the center height H of the device, the diameter of the motor to be tested can be changed over a wide range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A cross-sectional view of a device for synchronously measuring a back electromotive force coefficient and a cogging torque of a motor according to the present invention;

[0022] Figure 2 for Figure 1A side view of a device for synchronously measuring a back electromotive force coefficient and a cogging torque of a motor;

[0023] Figure 3 for Figure 1 A top view of a device for synchronously measuring a back electromotive force coefficient and a cogging torque of a motor;

[0024] Figure 4 for Figure 1 A schematic diagram of the internal structure of a device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor;

[0025] Figure 5 for Figure 1 A cross-sectional view of the rotor conversion sleeve structure when the device for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor is used;

[0026] Figure 6 for Figure 5 A side view of a rotor conversion sleeve structure;

[0027] Figure 7 for Figure 1 A cross-sectional view of the stator conversion sleeve structure when the device for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor is used;

[0028] Figure 8 for Figure 7 A side view of a stator conversion sleeve structure;

[0029] Fig. 9 for Figure 1 A schematic diagram of a device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor in a use state;

[0030] Fig.10 for Figure 1 A schematic diagram of another usage state of the device for synchronously measuring the back electromotive force coefficient and cogging torque of a motor.

[0031] In the figure: 100, a device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor; 10, a bottom plate; 11, a main body; 12, a positioning bar; 20, a driving structure; 21, a servo motor; 22, a motor mounting seat; 23, a coupling; 30, a force measuring structure; 31, a torque sensor; 32, a sensor mounting seat; 40, a rotating shaft structure; 41, a rotating shaft; 42, a rotating shaft bearing; 43, a rotating shaft bearing seat; 50, a clamping structure; 51, a clamping seat; 52, a clamping bolt pair; 53, a fixing bolt pair; 54, a crossbeam; 55, a dovetail slider; 60, a height adjustment structure; 61, a guide Rail mounting plate; 62, adjustment structure; 620, fine-tuning screw; 621, left fine-tuning nut; 622, right fine-tuning nut; 623, left fine-tuning slider; 624, right fine-tuning slider; 63, fine-tuning slide plate; 64, adjustment pad; 65, linear guide pair; 67, side plate; 670, dovetail guide; 68, limit part; 680, limit plate; 681, limit screw; 70, support structure; 71, support bearing seat; 72, support bearing; 200, rotor; 300, stator; 400, conversion sleeve; 500, pressure cover; 600, auxiliary tooling; 700, connecting tooling. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that when one is referred to as being "fixed to" another, it may be directly on the other or may also be centered. When one is considered to be "connected to" another, it may be directly connected to the other or may also be centered. When one is considered to be "set on" another, it may be directly set on the other or may also be centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] See also Figures 1 to 10The present invention provides a device 100 for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor, comprising a base plate 10, a driving structure 20, a force measuring structure 30, a rotating shaft structure 40, a clamping structure 50, a height adjusting structure 60 and a supporting structure 70.

[0036] The bottom plate 10 includes a main body 11 and a positioning bar 12. The positioning bar 12 is fixed to the main body 11 with bolts to realize that each component is installed on the same plane to ensure the front-to-back coaxiality of the rotation center axis of each component.

[0037] The driving structure 20 includes a servo motor 21, a motor mounting seat 22 and a coupling 23. The motor mounting seat 22 is fixed to the main body 11 of the base plate 10, and the servo motor 21 is fixed to the motor mounting seat 22 by bolts. The output shaft of the servo motor 21 is connected to the coupling 23. The driving structure 20 provides rotational power for the device 100 for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor.

[0038] The force measuring structure 30 includes a torque sensor 31 and a sensor mounting seat 32. The sensor mounting seat 32 is fixed to the main body 11 of the base plate 10, and the torque sensor 31 is installed on the sensor mounting seat 32 and fixedly connected to the coupling 23. The torque sensor 31 is used to collect the test data of the cogging torque and feed the collected data back to the upper processor.

[0039] The rotating shaft structure 40 includes a rotating shaft 41, a rotating shaft bearing 42, and a rotating shaft bearing seat 43. The rotating shaft bearing seat 43 is fixed to the main body 11 of the base plate 10 by bolts, and the rotating shaft bearing 42 is fixed at both ends of the rotating shaft 41 by interference fit, and the rotating shaft bearing 42 and the rotating shaft 41 are installed on the shaft bearing seat 43. In this embodiment, the rotating shaft bearing 42 is a 6416 deep groove ball bearing. The function of the rotating shaft structure 40 is to transfer torque. One side is connected to the rotor 200 of the motor under test, and the other side is connected to the torque sensor 31 through the coupling 23, so as to realize the action of the rotor 200 of the motor under test and the servo motor 21 rotating at a synchronous speed.

[0040] The clamping structure 50 includes a clamping seat 51, a clamping bolt pair 52, a fixing bolt pair 53, a crossbeam 54, and a dovetail slider 55. The dovetail slider 55 is fixed to opposite sides of the clamping seat 51, and the clamping bolt pair 52 and the fixing bolt pair 53 are screwed into the threaded holes of the crossbeam 54. The crossbeam 54 is fixed to the side plate 67 of the height adjustment structure 60, and the dovetail slider 55 is inserted into the dovetail guide rail 670 of the side plate 67. When the stator 300 or assembly of the motor under test is fixed on the test bench and the center height is adjusted, the clamping seat 51 can move up and down along the dovetail guide rail 670. In this embodiment, the clamping seat 51 is V-shaped.

[0041] The height adjustment structure 60 includes a guide rail mounting plate 61, an adjustment structure 62, a fine-tuning slide plate 63, an adjustment pad 64, a linear guide pair 65, a side plate 67, and a limiter 68. The adjustment structure 62 includes a fine-tuning screw 620, a left fine-tuning nut 621, a right fine-tuning nut 622, a left fine-tuning slider 623, and a right fine-tuning slider 624. The guide rail mounting plate 61 is fixedly mounted on the side plate 67, and the linear guide pair 65 is mounted on the guide rail mounting plate 61. The left fine-tuning nut 621 and the right fine-tuning nut 622 are respectively mounted on the fine-tuning screw 620. The left fine-tuning nut 621 is fixed to the left fine-tuning slider 623, and the right fine-tuning nut 622 is fixed to the right fine-tuning slider 624. The left fine-tuning slider 623 and the right fine-tuning slider 624 are mounted on the linear guide pair 65. The fine-tuning slide plate 63 is mounted between the left fine-tuning slider 623 and the right fine-tuning slider 624. The cross section of the fine-tuning slide plate 63 is trapezoidal or triangular. In the present embodiment, the cross section of the fine-tuning slide plate 63 is trapezoidal. The left fine-tuning slider 623 and the right fine-tuning slider 624 are inclined surfaces close to the fine-tuning slide plate 63 and correspond to the fine-tuning slide plate 63. The adjustment pad 64 is fixed to the fine-tuning slide plate 63, and the clamping seat 51 is fixed to the adjustment pad 64.

[0042] By rotating the fine-tuning screw 620, the left fine-tuning slider 623 and the right fine-tuning slider 624 will move to the center or both sides at the same time, driving the fine-tuning slider 63 to rise or fall, thereby realizing stepless adjustment of the center height of the stator 300 or assembly of the motor under test, so that it is completely consistent with the overall center height H of the test device. The limiting part 68 includes a limiting plate 680 and a limiting screw 681. The limiting plate 680 is located on both sides of the guide rail mounting plate 61. The limiting screw 681 is fixed to the limiting plate 680, which is used to prevent the right fine-tuning slider 624 and the left fine-tuning slider 623 from moving to the left or right after the center height H is adjusted, thereby changing the center height H.

[0043] The support structure 70 includes a support bearing seat 71 and a support bearing 72. Preferably, the support bearing 72 is a 6305 deep groove ball bearing. The support bearing seat 71 is fixed to the main body 11 of the base plate 10. The inner hole of the support bearing 72 and the rotor connection fixture 700 to be tested are matched with a small clearance and locked with a nut, which is convenient for disassembly. This structure is used to add auxiliary support to the test piece with a long rotor of the motor to be tested and poor stability when using a cantilever structure, so that the rotor of the motor to be tested rotates more smoothly, thereby improving the test accuracy.

[0044] When using the device 100 for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor, first adjust the center height H of the stator 300 or the assembly of the motor under test, and its center height H must be completely consistent with the center height H of the test device system; connect the rotor or the shaft interface of the assembly of the motor under test together with the rotor connecting fixture 700, and then connect it to the shaft 41 so that it can rotate together with the shaft 41.

[0045] Fix the stator 300 of the motor under test on the clamp 51, and connect the three-phase lead wires of the stator 300 to the oscilloscope; connect the signal line of the torque sensor 31 to the torque test signal processor to realize the conversion between digital and torque readings; use the servo driver to drive the servo motor 21 to rotate, set the speed to 1000rpm, the servo motor 21 drives the torque sensor 31 to rotate through the coupling 23, and the torque sensor 31 drives the rotating shaft 41 and the rotor of the motor under test to rotate together.

[0046] Since there is no deceleration or acceleration mechanism in the middle, the rotation speed of the motor under test is consistent with the rotation speed of the servo motor 21, which replaces the current operation of manually pulling the motor under test to rotate when testing the back electromotive force, making the rotation speed of the motor under test more uniform and accurate, thereby obtaining the accurate 1000-rpm back electromotive force coefficient of the motor under test.

[0047] Since the motor under test is not powered on and is in an open circuit state, the torque Ttotal (Nm) measured by the torque sensor 31 includes two components. One component is the friction loss caused by bearing friction and air friction, and this part of the torque is constant when the speed is constant; the other component is the cogging torque, which fluctuates with the change of the rotor rotation position, and the peak value of the torque fluctuation is the cogging torque.

[0048] For testing of motors with non-circular shapes (such as square, hexagonal, etc.), the test of this type of motor is to put a conversion sleeve 400 on the stator 300 or assembly of the motor under test, so that the conversion sleeve 400 and the stator 300 or assembly of the motor under test become one; the working principles of the remaining tests are the same as above.

[0049] Insert the rotor 200 to be measured into the conversion sleeve 400, and use screws to lock the conversion sleeve 400 on the flange surface of the motor to be measured, so that the motor to be measured and the conversion sleeve 400 become one; the inner hole SxS of the conversion sleeve 400 is matched according to the shape and size of the motor to be measured, and D and M are matched with the flange mounting holes of the motor to be measured. The size of D should be slightly larger than the maximum diameter of the flange surface of the motor to be measured. The shape of the inner hole of the conversion sleeve can also be extended to other shapes, such as triangle, pentagon, hexagon, other special shapes, etc.

[0050] When the shape of the stator 300 of the motor under test is non-circular, the conversion sleeve 400 and the gland 500 are used to achieve this. The inner hole size and shape of the conversion sleeve 400 are matched with the shape and shape of the stator 300 of the motor under test. The height H of the conversion sleeve 400 should be 0.2-0.3mm smaller than the height of the iron core of the stator 300 of the motor under test. The inner hole size D1 of the gland 500 should be 2-3mm larger than the outer diameter size D of the wire end of the stator 300 of the motor under test. The outer diameter size of the conversion sleeve 400 can be arranged under the screw hole. When working, the stator 300 of the motor under test is inserted into the inner hole of the conversion sleeve 400, and the two ends are pressed tightly with the gland 500, so that the stator 300 of the motor under test becomes one with the conversion sleeve 400. The inner hole shape of the conversion sleeve 400 can also be extended to other shapes. Such as triangle, pentagon, hexagon, other special shapes, etc.

[0051] Since the two side panels 67 and the clamping seat 51 are connected together by the dovetail slider 55 and the dovetail guide rail 670, the two side panels 67 are also connected to the guide rail mounting plate 61, so when the side panel 67 is moved, the clamping structure 50 on the right and the height adjustment structure 60 will also move as a whole. Since the mounting bolt through holes of the side panel 67 adopt waist-shaped rectangular holes, the center distance between the two circles is 30mm, and there is also a row of threaded holes with a center hole distance of 30mm on the bottom plate 10, the side panel 67 can move axially left and right along the positioning strip 12, so that test pieces of any length can be tested as needed.

[0052] The center height can also be adjusted by adding an adjustment pad 64 as the first step of adjustment, and the adjustment structure 62 as the second step of adjustment. Adjust the fixing bolt pair 53 to the top, screw the clamping bolt pair 52 into the middle screw hole of the crossbeam 54, insert the lifting plate into the clamping bolt pair 52 and fix it on the clamp seat 51, rotate the clamping bolt pair 52, and the clamp seat 51 will rise to a certain height along the dovetail guide rail 670, put in the adjustment pad 64, and then remove the lifting plate.

[0053] The auxiliary tooling 600 is used to adjust the center height. After the first step of adjusting the center height is completed, the auxiliary tooling 600 is connected to the rotating shaft 41, and the clamping seat 51 is moved upward according to the second step of adjusting the center height. When both sides of the clamping seat 51 are in full contact with the outer circumference of the auxiliary tooling 600, the center height is adjusted in place. The outer circumference size of the auxiliary tooling 600 must be exactly the same as the outer circumference size of the stator 300 or assembly of the motor being tested, and the structural form of the auxiliary tooling 600 should be determined according to the connection requirements.

[0054] The device 100 for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor of the present invention has the following effects:

[0055] Effect 1: The device of the present invention can accurately test the back electromotive force coefficient of the permanent magnet synchronous motor;

[0056] Effect 2: The device of the present invention can accurately test the cogging torque of the permanent magnet synchronous motor;

[0057] Effect 3: The present invention integrates the back-EMF coefficient test and the cogging torque test of the permanent magnet synchronous motor into one device, and can complete two completely different types of motor performance tests at one time through one installation, thereby greatly simplifying the test process, saving test time, and improving test efficiency;

[0058] Effect 4: The present invention overturns the test sequence of traditional permanent magnet synchronous motors, and advances the back-EMF coefficient test and cogging torque test, which previously had to be performed when the motor was in the complete state, to the stator 300 and rotor 200 component stage. In this way, the design or manufacturing defects of the stator and rotor 200 can be discovered early, and it can even be determined whether the defect is in the stator 300 or the rotor 200. By effectively controlling the quality of the stator and rotor components, the overall production efficiency of the motor is ultimately improved.

[0059] Effect 5: By adopting the structural form and testing method of the present invention, the back electromotive force and cogging torque tests of all permanent magnet synchronous motors can be covered by changing the size of the device;

[0060] Effect 6: The device of the present invention adopts the positioning bar 12 positioning method, which effectively solves the coaxiality problem between the central axis of the servo motor 21, the rotating shaft 41, the torque sensor 31 and the clamping seat 51, and this centering method has the advantages of simplicity, convenience and high precision;

[0061] Effect 7: The center height of the device of the present invention is adjusted by adjusting the pad 64 and fine-tuning, which can achieve stepless adjustment of the center height, and this adjustment method has the advantages of being simple, convenient, high-precision, and labor-saving;

[0062] Effect 8: The moving mode of the fine-tuning structure of the device of the present invention adopts a linear guide pair 65, which can make the movement of the right fine-tuning slider 624 and the left fine-tuning slider 623 easy, reliable, time-saving, labor-saving, and high-precision;

[0063] Effect 9: The device of the present invention adopts a method of adjusting the center height by using the auxiliary tooling 600, which can achieve high-precision adjustment of the center height, and the coaxiality of the stator 300 and the rotor 200 of the motor under test can reach within 0.015 mm.

[0064] Effect 10: The device of the present invention can realize the testing of various motors with heterogeneous shapes by adding the conversion sleeve 400.

[0065] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor, comprising a base plate, characterized in that: It also includes a driving structure, a force measuring structure, a rotating shaft structure, a clamping structure and a height adjustment structure, wherein the driving structure includes a servo motor, and the servo motor is fixedly mounted on the base plate, the force measuring structure includes a torque sensor, the rotating shaft structure includes a rotating shaft, and both ends of the torque sensor are respectively connected to the servo motor and the rotating shaft, the height adjustment structure is mounted on the base plate, the clamping structure is mounted on the height adjustment structure, the stator of the motor under test is fixed on the clamping structure, the height adjustment structure adjusts the center height of the stator of the motor under test so that the center height of the stator of the motor under test is consistent with the center height of the device for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor, the rotor of the motor under test is connected to the rotating shaft, the servo motor drives the rotor of the motor under test to rotate through the torque sensor and the rotating shaft, so that the rotor of the motor under test is consistent with the speed of the servo motor and rotates evenly to obtain the back electromotive force coefficient, the torque sensor measures the total torque to obtain the cogging torque, and the height adjustment structure includes an adjustment structure, The fine-tuning slide and the adjusting pad, the clamping structure includes a clamping seat, the fine-tuning slide is slidably connected with the adjusting structure, the adjusting pad is fixedly installed on the fine-tuning slide, the clamping seat is fixedly installed on the adjusting pad, and the adjusting structure drives the fine-tuning slide to move up and down so that the height of the clamping seat is adjusted. The adjusting structure includes a fine-tuning screw, a left fine-tuning nut, a right fine-tuning nut, a left fine-tuning slider and a right fine-tuning slider, the left fine-tuning nut and the right fine-tuning nut are respectively installed on the fine-tuning screw, the left fine-tuning slider and the right fine-tuning slider are respectively fixedly connected with the left fine-tuning nut and the right fine-tuning nut, the fine-tuning slide is located between the left fine-tuning slider and the right fine-tuning slider, the left fine-tuning slider and the right fine-tuning slider are facing the side of the fine-tuning slide that is an inclined surface corresponding to the fine-tuning slide, and the device for synchronously measuring the back electromotive force coefficient and the cogging torque of the motor also includes a supporting structure, the supporting structure includes a supporting bearing seat and a supporting bearing, the supporting bearing seat is installed on the base plate, and the supporting bearing is installed on the supporting bearing seat.

2. The device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor according to claim 1, characterized in that: The cross section of the fine-tuning slide plate is trapezoidal or triangular.

3. The device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor according to claim 1, characterized in that: The height adjustment structure also includes a guide rail mounting plate, a linear guide pair and a side plate, the guide rail mounting plate is fixed to the side plate, the linear guide pair is installed on the guide rail mounting plate, and the left fine-tuning slider and the right fine-tuning slider are respectively fixed to the linear guide pair.

4. The device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor according to claim 3, characterized in that: The side plate includes a dovetail guide rail, and the clamping structure also includes a dovetail slider. The dovetail slider is fixed to both ends of the clamp seat and is inserted into the dovetail guide rail so that the clamp seat is slidably installed on the side plate.

5. The device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor according to claim 3, characterized in that: The height adjustment structure also includes two limiting parts, each limiting part includes a limiting plate and a limiting screw, the limiting plate is installed on the guide rail mounting plate, the limiting screw is fixed to the limiting plate, and the limiting part prevents the left fine-tuning slider and the right fine-tuning slider from sliding after the center height adjustment is completed.

6. The device for synchronously measuring the back electromotive force coefficient and the cogging torque of a motor according to claim 1, characterized in that: The clamping seat is V-shaped.

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