摘要：在高速永磁电机中，转子涡流损耗会使转子温度升高，影响电机效率等性能，甚至导致永磁体过热退磁。针对高速永磁电机中的转子涡流损耗问题，进行了解析分析和有限元计算，分析了产生转子涡流损耗的谐波来源，研究了不同定转子结构电机的转子涡流损耗，分析了定子槽数、槽口宽度、气隙长度、屏蔽层、定子齿开辅助槽对转子涡流损耗的影响。结果表明，增加定子槽数、减小槽口宽度、增加气隙长度可以减小转子涡流损耗；在护套和永磁体中间加一层高电导率屏蔽层能有效减小永磁体的涡流，且选择合适的屏蔽层厚度能够进一步减小转子涡流损耗；提出了使用合适宽度、深度、角度和槽型的辅助槽来减小转子涡流损耗、帮助电机散热的新方法。对高速永磁电机的研制具有重要的理论研究和工程应用价值。
关键词：高速永磁电机；转子涡流损耗；电机结构；辅助槽

Abstract: For highspeed permanent magnet motors, the rotor eddycurrent loss cannot be underestimated in that it has serious implications on the motors′ efficiency or even demagnetizes the permanent magnets because of the overheating problem. The sources of the harmonics which produce the rotor eddycurrent loss were put forward, and the analytical calculation was presented, then the loss of different motor structures were analyzed, and the influences of various stator slot numbers, slot opening width, airgap length, the shield and the auxiliary slot were studied. The results show that the rotor eddycurrent loss can be reduced by more slots, thinner slot opening width and larger airgap length. It also comes to the conclusion that a shield with high conductivity between the retaining sleeve and permanent magnets can reduce the rotor eddycurrent loss, and a proper thickness of the shied can help to minimize the loss. The auxiliary slot is studied, and with proper width, depth angle and type, the auxiliary slot can be used to reduce the rotor eddycurrent loss and cool the motors. The research is of great value in theory and engineer applications for highspeed permanent magnet motors.
Key words: highspeed permanent magnet motor; rotor eddycurrent loss; motor structures; auxiliary slot