Automatic Detection Method of Cogging Torque of Permanent Magnet Synchronous Motor

A permanent magnet synchronization and cogging torque technology, applied in the detection field, can solve the problems of complex installation, inability to continuously detect, and low accuracy of manual detection of cogging torque, and achieve the effect of easy implementation

Active Publication Date: 2011-12-07
SHANGHAI GIE EM
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Problems solved by technology

There are different defects in this method. Among them, the accuracy of manual detection of cogging torque is very low, and it cannot be continuously detected corresponding to the position. It can only understand the approximate performance of the cogging torque of the permanent magnet synchronous motor; and the use of high-precision servo system Drag the permanent magnet synchronous motor to be tested for testing, which requires high mechanical precision and complicated installation

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  • Automatic Detection Method of Cogging Torque of Permanent Magnet Synchronous Motor
  • Automatic Detection Method of Cogging Torque of Permanent Magnet Synchronous Motor
  • Automatic Detection Method of Cogging Torque of Permanent Magnet Synchronous Motor

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[0028] In order to make the technical means, creation features, achievement goals and effects of the present invention easy to understand and understand, the present invention will be further described below with reference to the specific drawings.

[0029] According to the cause of the cogging torque, it can be known that the cogging torque changes periodically with the rotor position of the motor. Therefore, using a frequency converter to drive a permanent magnet synchronous motor can detect the output torque of the frequency converter when the rotor position changes, and then calculate The cogging torque of the permanent magnet synchronous motor to be tested can be obtained.

[0030] The present invention is based on the implementation of the inverter-driven permanent magnet synchronous motor system such as figure 1 As shown, in the control loop of the inverter, the inverter uses the position signal and speed command sent by the position sensor to control the operation of t...

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Abstract

The invention discloses an automatic detection method for the cogging torque of a permanent magnet synchronous motor. The method is mainly realized through the following steps: (1) virtualizing one revolution of the motor as a number of cogging periods according to the number of cogging; (2) In a cogging cycle, it is divided into several equal parts according to the accuracy requirements and the limitation of storage space; (3) The motor runs through several cogging cycles; (4) The cogging torque is calculated according to the data of each cogging cycle. The invention can simply, automatically and accurately detect the cogging torque of the permanent magnet synchronous motor.

Description

Technical field: [0001] The present invention relates to a detection method, in particular to a detection method for cogging torque of a permanent magnet synchronous motor. Background technique: [0002] In the permanent magnet synchronous motor, because the relative positions of the magnetic poles of the permanent magnet rotor and the slots of the stator are different, the permeance of the main magnetic circuit is different. The torque acting on the position is called cogging torque. [0003] Due to the existence of this torque, the permanent magnet synchronous motor often causes vibration and noise, which reduces the control accuracy of the system. [0004] There are mainly two ways to detect the cogging torque in the prior art: one is manual detection, and the other is to use a high-precision servo system to detect. There are different defects in this method. Among them, the manual detection of cogging torque is very low in accuracy, and it cannot be continuously detect...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L3/00
Inventor 吴志敢黄洪剑周根富
Owner SHANGHAI GIE EM
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