基于定子齿冠偏心的外转子永磁电机转矩波动抑制

Reducing Torque Ripple of External Rotor Permanent Magnet Motor Based on Structure of Stator Tooth Eccentricity

为了抑制12槽10极风机用外转子永磁同步电动机的转矩波动,研究了定子齿冠偏心的结构。该方法基于不等气隙长度的思想,保持了初始结构的定子齿冠极弧中间部分对应的气隙长度不变,而齿冠两边对应的气隙长度变宽。利用有限元分析软件对采用定子齿冠偏心结构的外转子永磁同步电机进行仿真计算分析,研究了不同偏心距离下电机的转矩波动系数,并分析了齿冠偏心对于输出转矩大小、齿槽转矩以及气隙磁场谐波畸变率的影响。仿真实验结果表明,采用定子齿冠偏心的结构,能有效地抑制输出转矩的波动和齿槽转矩的幅值,使气隙磁密波形得到改善。

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.