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时间谐波对永磁同步电机损耗的影响规律

, PP. 60-69

Keywords: 附加损耗,时步有限元法,气隙长度,变频器参数,转子磁路结构

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Abstract:

为了减小永磁同步电机中由电流时间谐波引起的损耗,以一台4.2kW、8极表面式永磁电机为例,采用时步有限元法,分析了空载变频器供电时电机各部位附加损耗的分布规律;研究了不同变频器参数(包括调制比a和开关频率fc)、气隙长度δ和转子磁路结构(包括内置式和表面式)时电机各部位附加损耗的变化规律;最后,对三台样机进行实验,以验证不同变频器参数对附加损耗的影响规律。结果显示变频器供电时,附加损耗主要集中在永磁体上,定子铁心其次,转子铁心比重最小;fc3kHz时,每增加1kHz,附加损耗平均降低6.5%;a每增加0.1,附加损耗平均降低18.7%;δ每增加0.1mm,附加损耗平均降低5.4%;内置式结构转子铁心附加损耗比重比表面式大,而永磁体附加损耗比重较小。

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