永磁电机磁阻转矩的抑制方法.pdfVIP

第 36 卷 　第 6 期 西 　安 　交 　通 　大 　学 　学 　报 Vol . 36 　№6 2002 年 6 月 　　　　 J un . 2002 J OU RNAL O F XI′AN J IAO TON G UN IV ER SI T Y ( ) 文章编号 :0253 - 987X 2002 永磁电机磁阻转矩的抑制方法 王兴华 , 励庆孚 , 石 　山 (西安交通大学电气工程学院 , 7 10049 , 西安) 摘要 : 介绍了定子齿面加辅助凹槽和转子磁极分段移位两种抑制磁阻转矩的方法. 利用傅里叶分 解及能量虚位移法 ,推导了磁阻转矩的计算公式. 从谐波分析的角度 ,对齿面加辅助凹槽和转子磁 极分段移位的原理及其对磁阻转矩波形的影响进行了深入分析 ,指出齿面所加凹槽数应使 6 q 为 奇数 ,凹槽结构和磁极边缘削角可影响磁阻转矩的波形 ,采用转子磁极分段移位可有效减小磁阻转 矩的基波分量. 通过二维有限元计算 ,证明该结论是正确的. 关键词 : 永磁电机 ;磁阻转矩 ;抑制方法 中图分类号 : TM35 1 　文献标识码 : A Method of Reducing Cogging Torque in Permanent Magnet Motor Wang X i ng h ua , L i Q i ngf u , S hi S han ( School of Elect rical Engineering , Xi ′an Jiaotong Univer sit y , Xi ′an 7 10049 , China) Abstract : Two met hods of reducing cogging torque , namely , t he st ator toot h notching and t he two rotor pole st acks shifting are p resented . The calculation formula of t he cogging torque are derived by t he Fourier decompo sition and t he virt ual displacement met hod . Based on t he analysis of t he harmon ics , t he mechanism of t he p resent met hods and t he effect of t he met hods on t he waveforms of t he cog ging torque are clarified and analyzed . Some import ant conclusions are pointed out :t he number of t he notches should be cho sen to make t he 6 q equal to an odd ;t he dimension of t he notches and cutting off pole corner s can affect t he waveforms of t he cogging torque ;and t he basic component of t he cogging torque can be reduced by shifting