CN221425851U - Test structure of permanent magnet motor cogging torque - Google Patents
Test structure of permanent magnet motor cogging torque Download PDFInfo
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- CN221425851U CN221425851U CN202323306362.7U CN202323306362U CN221425851U CN 221425851 U CN221425851 U CN 221425851U CN 202323306362 U CN202323306362 U CN 202323306362U CN 221425851 U CN221425851 U CN 221425851U
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- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000003993 interaction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model discloses a test structure of cogging torque of a permanent magnet motor, which comprises a motor to be tested, a low-speed driving unit and a torque sensing unit, wherein the motor to be tested is arranged on a fixed platform; the torque sensing unit is coaxially connected with an output shaft of the motor to be tested; and the torque sensing unit is driven by the low-speed driving unit to drive the output shaft of the motor to be tested to rotate, and current torque data information is obtained. In the test structure of the cogging torque of the permanent magnet motor, the low-speed driving unit drags the tested motor to rotate at an extremely low speed through low-speed stable power, accurate data reflecting the change condition of the cogging torque of the tested motor can be measured through the torque sensor, and the operation is simple, convenient and efficient.
Description
Technical Field
The utility model relates to a test structure, in particular to a test structure for cogging torque of a permanent magnet motor.
Background
Cogging torque is the torque produced by the interaction between a permanent magnet and a stator core when the permanent magnet motor windings are not energized, and is caused by the pulsation of the tangential component of the interaction force between the permanent magnet and the stator teeth. When the motor rotor rotates, the magnetic conductance of the two sides of the permanent magnet is changed greatly in a small section range corresponding to the tooth slot of the stator, so that the magnetic field energy storage is changed, and the tooth slot torque is generated.
Cogging torque is one of the special problems of permanent magnet motors, and because cogging torque can cause vibration and noise to the motor, rotational speed fluctuation occurs, so that the motor cannot run stably, and the performance of the motor is affected, especially at low speed, more seriously. It is therefore a critical issue that must be considered and addressed in the design and manufacture of high performance permanent magnet motors.
In the prior art, in order to test the torque of a tooth slot, components such as weights, weight hooks, tool supports, tension lines and the like and a working platform are often needed. When the working personnel tests the torque of the tooth slot, the processed supporting rod is arranged at one end of the motor shaft, the level gauge is used for adjusting the zero scale mark of the disc, a certain-strength and lighter rope is wound on the weight, the supporting rod is rotated to the scale of the measured point, the weight is gently hung on the supporting rod, the mass of the weight is recorded when the supporting rod starts to rotate, the torque of the tooth slot is tested, and the whole testing process is extremely complicated in operation.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model provides a test structure of cogging torque of a permanent magnet motor.
The utility model relates to a test structure of cogging torque of a permanent magnet motor, which comprises a motor to be tested, a low-speed driving unit and a torque sensing unit, wherein the motor to be tested is arranged on a fixed platform;
The torque sensing unit is coaxially connected with an output shaft of the motor to be tested;
and the torque sensing unit is driven by the low-speed driving unit to drive the output shaft of the motor to be tested to rotate, and current torque data information is obtained.
In the test structure of the cogging torque of the permanent magnet motor, the low-speed driving unit comprises a low-speed driving motor which is fixedly arranged, and a power output shaft of the low-speed driving motor is connected with the torque sensing unit through a transmission belt.
In the test structure of the cogging torque of the permanent magnet motor, the low-speed driving motor is fixedly arranged on the fixed platform through the mounting frame.
In the test structure of the cogging torque of the permanent magnet motor, the end part of the power output shaft is provided with the driving wheel, and the driving belt is sleeved on the driving wheel.
In the test structure of the cogging torque of the permanent magnet motor, the torque sensing unit comprises a torque sensor, a loading end shaft of the torque sensor is fixedly connected with an output shaft of the motor to be tested coaxially through a corrugated spring coupling, and a power input end shaft of the torque sensor is connected with the low-speed driving unit through a transmission belt.
In the test structure of the cogging torque of the permanent magnet motor, the driven wheel is arranged at the end part of the power input end shaft, and the transmission belt is sleeved on the driven wheel.
In the test structure of the cogging torque of the permanent magnet motor, the end part of the motor to be tested is provided with the support flange, and the end part of the torque sensor is arranged on the support flange.
In the test structure of the cogging torque of the permanent magnet motor, the bottom of the torque sensor is fixedly connected to the fixed platform.
In the test structure of the cogging torque of the permanent magnet motor, the low-speed driving unit drags the tested motor to rotate at an extremely low speed through low-speed stable power, accurate data reflecting the change condition of the cogging torque of the tested motor can be measured through the torque sensor, and the operation is simple, convenient and efficient.
Drawings
Fig. 1 is a schematic diagram of a test structure of cogging torque of a permanent magnet motor according to the present utility model.
Detailed Description
The present utility model is described in further detail below with reference to the drawings to enable those skilled in the art to practice the utility model by referring to the description.
As shown in fig. 1, the test structure of cogging torque of a permanent magnet motor provided by the utility model comprises a motor to be tested 2 arranged on a fixed platform 1, wherein a plurality of mounting grooves and mounting holes are formed in the fixed platform 1 so as to adapt to different mounting requirements of the motor to be tested 2. The device further comprises a low-speed driving unit 5 and a torque sensing unit 3, wherein the torque sensing unit 3 is coaxially connected with an output shaft (not shown in the figure) of the motor 2 to be tested, the torque sensing unit 3 is driven by the low-speed driving unit 5 to drive the output shaft of the motor 2 to be tested to rotate, and current torque data information can be acquired from the torque sensing unit 3 through external data processing equipment, so that testing of cogging torque data of the permanent magnet motor is achieved.
In a specific implementation, the low-speed driving unit 5 may specifically include a low-speed driving motor 52 that is fixedly disposed, and a power output shaft 54 of the low-speed driving motor 52 is connected to the torque sensing unit 3 through a transmission belt 4. The low-speed driving motor 52 may also be fixedly arranged on the fixed platform 1 through the mounting frame 51, and the mounting position may be adjusted by selecting appropriate mounting grooves and mounting holes on the fixed platform 1. A driving wheel 53 is further arranged at the end part of the power output shaft 54, and the driving belt 4 is sleeved on the driving wheel 53.
In the test structure of cogging torque of a permanent magnet motor according to the present utility model, the torque sensor unit 3 specifically includes a torque sensor 31, a loading end shaft (not shown in the drawing) of the torque sensor 31 is fixedly connected coaxially with an output shaft of the motor 2 to be tested through a bellows spring coupling (not shown in the drawing), and a power input end shaft 33 of the torque sensor 31 is connected with the low-speed drive unit 5 through a transmission belt 4. In a specific operation, the driven wheel 32 may be disposed at an end of the power input end shaft 33, and the driving belt 4 may be sleeved on the driven wheel 32, that is, two ends of the driving belt 4 may be respectively sleeved on the driven wheel 32 and the driving wheel 53, and the rotation speed of the driven wheel 32 is further reduced because the diameter of the driven wheel 32 is far greater than that of the driving wheel 53. The low-rotation-speed power drives the power input end shaft 33, and is further transmitted to the output shaft of the motor 2 to be tested through the loading end shaft of the torque sensor 31 and the corrugated spring coupling, when the motor 2 to be tested rotates slowly and stably, the torque sensor 31 outputs a torque value which changes regularly, and the change is caused by cogging torque. In order to further reduce the interference of the shafting (such as friction of the bearing, inertia of the output shaft and the rotor of the motor to be tested) on the torque value, the change of the shafting torque value can be tested in the same manner and under the condition of not installing the stator of the motor to be tested 2, and more accurate cogging torque data can be obtained by taking the difference between the shafting and the output shaft. To ensure that the measuring accuracy is ensured, it is also necessary to ensure that the drive belt 4 does not twist, i.e. to adjust the plane consistency of the driven wheel 32 with the driving wheel 53.
In the test structure of cogging torque of a permanent magnet motor according to the present utility model, in order to set the torque sensor 31, a support flange 21 is further disposed at an end of the motor 2 to be tested, and the end of the torque sensor 31 is mounted on the support flange 21, so as to ensure coaxiality between the torque sensor 31 and an output shaft of the motor 2 to be tested. Further, the bottom of the torque sensor 31 may be fixedly connected to a suitable position on the fixed platform 1.
In the test structure of the cogging torque of the permanent magnet motor, the low-speed driving unit 5 drags the tested motor 2 to rotate at an extremely low speed through low-speed stable power, and can detect accurate data reflecting the change condition of the cogging torque of the tested motor 2 through the torque sensor 31, so that the operation is simple, convenient and efficient.
Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the utility model would be readily apparent to those skilled in the art, and accordingly, the utility model is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. The test structure of the cogging torque of the permanent magnet motor comprises a motor to be tested, which is arranged on a fixed platform, and is characterized by further comprising a low-speed driving unit and a torque sensing unit;
The torque sensing unit is coaxially connected with an output shaft of the motor to be tested;
and the torque sensing unit is driven by the low-speed driving unit to drive the output shaft of the motor to be tested to rotate, and current torque data information is obtained.
2. The test structure of cogging torque of permanent magnet motor according to claim 1, wherein the low-speed driving unit comprises a low-speed driving motor fixedly arranged, and a power output shaft of the low-speed driving motor is connected with the torque sensing unit through a transmission belt.
3. The permanent magnet motor cogging torque test structure according to claim 2, wherein the low-speed drive motor is fixedly disposed on the fixed platform through a mounting frame.
4. The permanent magnet motor cogging torque testing structure according to claim 2, wherein a driving wheel is arranged at the end part of the power output shaft, and the driving belt is sleeved on the driving wheel.
5. The test structure of cogging torque of permanent magnet motor according to claim 1, wherein the torque sensor unit comprises a torque sensor, a loading end shaft of the torque sensor is fixedly connected with an output shaft of the motor to be tested coaxially through a corrugated spring coupling, and a power input end shaft of the torque sensor is connected with the low-speed driving unit through a transmission belt.
6. The permanent magnet motor cogging torque testing structure according to claim 5, wherein a driven wheel is provided at an end of the power input end shaft, and the transmission belt is sleeved on the driven wheel.
7. The permanent magnet motor cogging torque test structure according to claim 5, wherein the end of the motor to be tested is provided with a support flange, and the end of the torque sensor is mounted on the support flange.
8. The permanent magnet motor cogging torque test structure of claim 7, wherein the bottom of the torque sensor is fixedly connected to the fixed platform.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221425851U true CN221425851U (en) | 2024-07-26 |
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