转子齿形状对10极12槽开关磁通电机转矩特性的影响

Effect of different rotor configurations on torque characteristics of a 10-pole/12-slot flux switching permanent magnet machine

开关磁通永磁电机是一种新型的双凸极结构无刷电机,功率密度高且结构简单,但由于其自身的双凸极结构,转矩波动较大,会引起较大的振动和噪声。针对一种应用于电动汽车的10极12槽开关磁通永磁电机,研究开关磁通永磁电机电磁转矩,齿槽转矩与转矩波动的特点。利用有限元分析法研究分析不同绕组结构以及不同转子齿结构(包括开槽齿、阶梯齿、偏心齿)对转矩性能的影响。将开关磁通永磁电机的新型转子齿结构特性与传统转子齿结构特性进行对比分析,通过仿真数据验证这几种新型转子齿结构可以实现有效减小齿槽转矩与转矩波动的功能,并且其输出的电磁转矩减小比例不大。

Flux switching permanent magnet machine（ FSPM） is a new kind of doubly-salient PM brushless machine,which has high power density and simple structure. But the main problem of FSPM is the high cogging torque and torque ripple due to its unique structure,which causes larger vibration and noise. The electromagtic torque,cogging torque and torque ripple characteristics of FSPM were investigated,which is a 10-plole /12-slot motor for electric vehicle application. In addition to different winding structures,three novel rotor configurations were proposed to reduce cogging torque and torque ripple,namely,rotor with notched teeth,rotor with stepped teeth,and rotor with eccentric teeth. Their characteristics are simulated by finite-element analysis（ FEA） and compared with FSPM which has conventional rotor teeth structure,the FEA results show that these novel rotor structures effectively reduce the cogging torque and torque ripple at only slight cost of average electromagnetic torque.