Method and device for reducing cogging torque of permanent magnet motor

Abstract

The invention discloses a method and a device for reducing cogging torque of a permanent magnet motor. Based on the generation mechanism of the cogging torque, a magnetic field pair affecting the amplitude of the cogging torque is obtained; Under the existing structure of the permanent magnet motor, the contribution value of the permeance at each position along the circumferential direction to the average torque, and the average torque distribution curve along the circumferential direction is obtained; comprehensively consider the target magnetism that affects the cogging torque. The cogging torque amplitude and the average torque distribution curve generated by the harmonics are used to obtain the area that has a large influence on the cogging torque but little influence on the average torque as the target optimization area. The size parameters of the core structure are optimized, so as to effectively reduce the cogging torque of the permanent magnet motor with less influence on the output torque of the permanent magnet motor.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and more particularly, relates to a method and device for reducing cogging torque of permanent magnet motors. Background technique [0002] As a wide range of key basic components, motors play a key role in improving the overall level of equipment manufacturing. At the same time, the rapid development of the manufacturing industry has also put forward higher requirements on the performance and quality of motors such as torque density, response speed, and torque ripple. Among them, torque ripple is an important factor affecting the torque quality of the motor and the control accuracy of the private server system. In addition, it will also cause the motor to vibrate, generate mechanical noise, and even affect the reliability of the motor in severe cases. The servo neighborhood has extremely high requirements on the smoothness of the motor output torque. The cogging torque of high-e...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method and device for reducing the cogging torque of a permanent magnet motor, thereby solving the problem that the existing method for reducing the cogging torque will reduce the average torque and reduce the slot fullness. rate technical issues

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