Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Permanent magnet synchronous motor cogging torque test method and device

A permanent magnet synchronous motor, cogging torque technology, used in motor generator testing, measuring devices, force/torque/work measuring instruments, etc.

Pending Publication Date: 2021-04-30
FUZHOU TAIQUAN IND CO LTD
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the detection of the cogging torque of the motor can only test the magnitude of the cogging torque, but the source of the cogging torque of the current permanent magnet synchronous motor cannot be judged from the detected data

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Permanent magnet synchronous motor cogging torque test method and device
  • Permanent magnet synchronous motor cogging torque test method and device
  • Permanent magnet synchronous motor cogging torque test method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Please refer to figure 1 , Figure 4 to Figure 6 , Embodiment one of the present invention is:

[0059] A method for testing the cogging torque of a permanent magnet synchronous motor, comprising the steps of:

[0060] S1. Acquiring the first expression of the torque data of the motor 1 to be tested varying with time;

[0061] S2. Perform Fourier transform on the first expression to obtain the second expression;

[0062] S3. Judging whether the frequency-domain energy distribution of the second expression conforms to the normal energy distribution, if so, the cogging torque of the motor 1 to be tested is normal, otherwise the cogging torque of the motor 1 to be tested is considered to be abnormal and the source of the abnormality is the fault type corresponding to the abnormal energy order in the frequency domain energy distribution. In this embodiment, according to whether the energy distribution on the preset order of the second expression conforms to the preset e...

Embodiment 2

[0084] Please refer to 1 and Figure 4 , the second embodiment of the present invention is:

[0085] A method for testing the cogging torque of a permanent magnet synchronous motor, on the basis of the above implementation example, after step S3, also includes:

[0086] S4. Perform an inverse Fourier transform on the second expression to obtain a third expression;

[0087] S5. Obtain the maximum torque value, the minimum torque value and the average torque value of the motor 1 to be tested from the torque value distribution in the third expression within the preset time;

[0088] S6. Subtracting the maximum value of the torque from the minimum value of the torque to obtain the value of the cogging torque.

[0089] In this example, the corresponding Figure 4 As shown, the second expression is inversely transformed by Fourier to obtain the third expression representing the change of the torque data with time, so that the average value of the torque and the value of the coggi...

Embodiment 3

[0094] Please refer to Figure 2 to Figure 3 , Embodiment three of the present invention is:

[0095] A permanent magnet synchronous motor cogging torque test device, such as figure 2 and image 3 As shown, it includes a motor to be tested 1, a drive motor 2, a rotating shaft 3, a belt 4, a pulley 5, a torque sensor 6 and a main control module 7; wherein, the rotor of the motor to be tested 1 is fixedly connected to one end of the rotating shaft 3, and the pulley 5 and The torque sensors 6 are respectively socketed on the rotating shaft 3 , one end of the belt 4 is socketed on the pulley 5 , and the other end is socketed on the rotating shaft of the drive motor 2 , and the main control module 7 is electrically connected to the torque sensor 6 . The main control module 7 is used to execute all the steps of the method for testing the cogging torque of a permanent magnet synchronous motor in the first or second embodiment.

[0096] In this embodiment, combined with the above ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a permanent magnet synchronous motor cogging torque test method and device, and the method comprises the steps: obtaining a first expression of the torque data size of a to-be-tested motor along with the time, carrying out Fourier transform of the first expression, and obtaining a second expression; and finally, judging whether the frequency domain energy distribution of the second expression conforms to normal energy distribution or not, if so, determining that the cogging torque of the to-be-tested motor is normal, and otherwise, determining that the cogging torque of the to-be-tested motor is abnormal and an abnormal source is a fault type corresponding to an abnormal energy order in the frequency domain energy distribution. In the device, a main control module acquires data of torque data of a to-be-tested motor along with time change through a torque sensor, all the steps of the method are executed, and different cogging torque sources of the to-be-tested motor are distinguished by utilizing different energy distributions of the torque data of the to-be-tested motor on orders of a frequency domain.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and device for testing cogging torque of a permanent magnet synchronous motor. Background technique [0002] Automotive steering motors usually use permanent magnet synchronous motors as the auxiliary power of the steering system. The cogging torque of the motor will directly affect the stability and feel of the car's handling. Therefore, it is very important to detect the cogging torque of the motor. In the prior art, the detection of the cogging torque of the motor can only test the magnitude of the cogging torque, but the source of the cogging torque of the current permanent magnet synchronous motor cannot be judged from the detected data. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a cogging torque testing method and device of a permanent magnet synchronous motor, which can judge the source of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01L5/00G01R31/34G06F17/14
CPCG01L5/0042G01R31/34G06F17/14
Inventor 陈晔刘仕强张祥林王齐杰
Owner FUZHOU TAIQUAN IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com