中文摘要：

目前高速永磁电机转子最常用的保护措施是碳纤维捆扎永磁体、永磁体外加非导磁或半导磁合金保护套,保护套的增加会给电机的散热带来严重的困难.针对以上问题,基于一台75 kW,60 000 r/min的高速永磁电机,设计了3种方案,同时基于应力场、电磁场和温度场对3种方案的转子强度、转子涡流损耗和温度分布进行了综合的比较与分析,通过一台采用非导磁合金保护套的样机进行了温升实验.实验结果表明,采用半导磁合金保护套时,会大大减小永磁体的厚度,但会产生更大的转子涡流损耗;采用非导磁合金保护套时,所需的永磁体和保护套的厚度最大;采用碳纤维保护套时,所需的保护套厚度最小,转子涡流损耗和温升分布也远远小于其他两种保护措施.

英文摘要：

Now,carbon fiber banding permanent magnet,non-magnetic and semi-magnetic alloy containment sleeve are commonly used to protect the permanent magnet （PM）for high-speed PM machine.However,containment sleeve will cause the difficult heat dissipation.Due to the above problems,the three schemes were designed for different protection measures based on a high-speed permanent magnet machine of 75 kW,60 000 r/min.At the same time,rotor strength,rotor eddy current loss and temperature distribution of the three schemes were compared and analyzed,based on the stress field,electromagnetic field and temperature field.The comparison to temperature rise experiment of high-speed permanent magnet machine with non-magnetic alloy containment sleeve was conducted.It is shown that,semi-magnetic alloy containment sleeve can greatly reduce the permanent magnet thickness,but more rotor eddy cyrrent loss will be produced.When the nonmagnetic alloy containment sleeve is used,the thickness of permanent magnet and the containment sleeve is the most,and when the carbon fiber containment sleeve is used,the protective sleeve is the thinnest,and the rotor eddy current loss and the temperature rise is far less than the other two kinds of protective measures.