关键词: 转矩波动, 有限元仿真, 齿槽转矩, 气隙磁场, 谐波畸变率

Abstract:

In order to reduce torque ripple of external rotor permanent magnet synchronous motor with 12 slots 10 poles, the structure of stator tooth eccentricity was studied. This method is based on the thinking of different air-gap length, keeping the air-gap length in middle part of stator tooth unchanged, while the air-gap length on both sides being broadened. Using finite element analysis software, the external rotor permanent magnet synchronous motor with structure of stator tooth eccentricity was calculated, the torque ripple, cogging torque and the air-gap magnetic field harmonic distortion in different eccentric distances were analyzed. The simulation results show that the structure of the stator tooth eccentricity can effectively reduce the amplitude of cogging torque and output torque ripple, and improve air-gap magnetic field waveform.

Key words: torque ripple, finite element simulation, cogging torque, air-gap magnetic field, total harmonic distortion