整距绕组双凸极永磁电机槽扭矩降低方法

Reduction of Cogging Torque for Full-Pitch Winding Doubly Salient Permanent Magnet Machine

整距绕组双凸极永磁(FMDSPM)电机具有高空间利用率、高扭矩密度、低扭矩波动的特征。转子极宽大,产生较大而又分布不平衡的槽扭矩,槽扭矩作为电机的固有特性影响电机性能输出提升。针对该问题,通过槽扭矩计算分析,提出了圆形定子极面、重构定转子气隙结构以平衡气隙中磁阻扭矩的解决方法。分析结果显示,该方法有效降低了槽扭矩,同时消除了槽扭矩峰值分布不均匀的现象。

Full-pitch winding multiphase doubly salient permanent magnet machine(FMDSPM)possesses some attractive features such as high space utilization, high torque density and low ripple of torque.However, there exists an inherent large cogging torque due to the wide rotor pole face. The cogging torque creates torque ripple and hence prevents the smooth rotation of the motor. Based on the analysis of calculation model, a method of circular stator pole surface and reconstrcting stator and rotor air gap structure was introduced to balance reluctance torque in air gap. Finite element analysis results showed that the method can reduce the slot torque and eliminate the uneven distribution of the peak of slot torque.