转子结构对高速无刷电机转子涡流损耗的影响  

Influence of rotor structure on rotor eddy-current loss in high-speed permanent magnet brushless DC motors

作　　者：周凤争[1] 沈建新[1] 王凯[1] 

机构地区：[1]浙江大学电气工程学院

出　　处：《浙江大学学报（工学版）》2008年第9期1587-1590,共4页Journal of Zhejiang University：Engineering Science

基　　金：浙江省自然科学基金资助项目(Y104442);留学人员科技活动项目择优资助项目

摘　　要：针对转子涡流损耗在高速电机中比较严重的问题,通过有限元分析研究了永磁体分块对转子涡流损耗的影响.分析表明:当永磁体周向宽度小于谐波磁场在永磁体中的透入深度时,永磁体分块能有效地减小永磁体中的涡流损耗;反之,永磁体分块会使永磁体中的涡流损耗增加.利用涡流磁场的屏蔽作用,在转子保护环和永磁体之间增加一层电导率高的铜片.尽管铜片中会产生涡流损耗,但该涡流产生的磁场抵消了气隙磁场的谐波分量,使永磁体、转子铁心以及保护环中的损耗显著减小,整体上降低了转子涡流损耗.Rotor eddy-current loss appears significant in high-speed permanent magnet brushless DC （PM BLDC） motors. The effect of segmenting magnets on rotor loss was analyzed with finite element analysis. Only when the circumferential width of the magnet segment is smaller than the skin depth, the eddy-current loss in the magnets can be reduced by segmenting, otherwise the eddy-current loss will increase, By using the shielding effect of the eddy-current magnetic field, a copper shield with high conductivity was used between the retaining sleeve and magnets. Although eddy-current loss is induced in the copper shield, this eddy-current magnetic field reduces the harmonic field in the air-gap, so that the loss in the magnets, rotor yoke and retaining sleeve are cut down dramatically, resulting in a reduction of the overall rotor eddy-current loss.

关 键 词：永磁无刷直流电机 高速电机 转子涡流损耗 永磁体分块 铜屏蔽层 

分 类 号：TM351[电气工程—电机]