Method for weakening and analyzing cogging torque of surface-mounted permanent magnet motor

Abstract

The invention discloses a method for weakening and analyzing cogging torque of a surface-mounted permanent magnet motor. The method belongs to the technical field of permanent magnet synchronous motors, and comprises the following steps: firstly, reducing cogging torque by adopting a magnetic pole eccentricity method, optimizing a magnetic pole eccentricity distance, and selecting an optimal eccentricity distance to minimize the cogging torque. A; according to the method, the cogging torque is weakened by changing the shape of a magnetic pole, and in order to further research the influence ofthe change of the shape of the magnetic pole on the cogging torque, radial air gap flux density and tangential air gap flux density components are obtained through Maxwell software simulation according to a Maxwell tensor method and substituted into the cogging torque. And finally, calculating the contribution of each-order air gap flux density harmonic wave to the cogging torque is calculated atany moment of an electric period by utilizing a method of combining a finite element and analysis. According to the method, the change of the cogging torque under different magnetic pole shapes is analyzed through the cogging torque waveform under each order.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, in particular to a method for weakening cogging torque and analyzing cogging torque. [0002] technical background [0003] Surface-mounted permanent magnet synchronous motors have the advantages of small size, light weight, simple structure, reliable operation, and high torque density, and are widely used in ships, aviation, public life and other fields. But cogging torque is generated due to the interaction between permanent magnets and stator slots, which has a great influence on the torque ripple of the motor, thereby affecting the overall performance of the motor. [0004] Scholars have studied many methods to weaken the cogging torque. The chute is widely used to reduce the cogging torque, but it is not easy to process and the production cost is high. In order to avoid this shortcoming, eccentric teeth are used instead of the chute. The cogging torque can also be...

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes a method for weakening the cogging torque and in order to solve the problem that the finite element method cannot analyze the source of the cogging torque and the analytical method is too complicated, a combination of the finite element method and the analytical method is proposed method to analyze the effect of changing the pole shape on the cogging torque

Images