中文摘要：

采用基于能量法和傅里叶分解的解析分析方法,推导出盘式永磁电机在斜极前后的齿槽转矩解析表达式,研究整体磁极斜极与分段磁极斜极对齿槽转矩的不同影响.在此基础上,提出通过确定磁极分段数量、优化分段磁块径向尺寸及选择合适极弧系数来进一步削弱齿槽转矩的方法,利用有限元法进行仿真分析,并将此方法应用于抽油机用盘式电机的转子结构设计.实验结果表明,采用分段磁极斜极方法对削弱盘式永磁电机的齿槽转矩具有理想的效果.

英文摘要：

An analytical method based on electromagnetic energy and Fourier series expansion was proposed,the mathematical model expression of cogging torque was deduced for PM poles skewing and normal motors,and the different effect of overall-skewing and stepped-skewing on cogging torque was discussed.Based on these expressions,a novel method was found for reducing cogging torque by suitable selection of pole-arc coefficient,the number of poles＇modules and their radial sizes.The validity of the proposed method was verified by 3Dfinite element analysis.This method was used on disc-type permanent magnet motor for novel pumping unit.The experiment result shows that stepped-skewing PM poles method is suitable for cogging torque reduction.