中文摘要：

为了对转子进行有效的冷却，在满足电机电磁性能的前提下，可通过减小保护套的厚度来尽可能增大定转子之间的气隙，因而必须对保护套和永磁体进行强度校核。将转子受力状况简化为平面应变问题，在此基础上推导出了两层过盈配合、三层过盈配合转子的应力场、应变场、位移场的解析公式，并利用有限元方法验证了解析公式的正确性。归纳了高速情况下热套式永磁转子强度设计准则，为转子的优化设计提供了理论依据。以一台额定转速120kr／min、10kW的高速永磁同步电机为例，给出了两种常用过盈配合高速电机转子的强度设计方法。

英文摘要：

In order to cool down the rotor effectively, air gap should be increased by decreasing the sleeve thickness, motor performance should be effectively improved, and the strength of sleeve and permanent magnet should be checked. In this paper, analytical formulas of stresses, strains and displacements of two-ply composite rotors and three-ply composite rotors are deduced on the condition that rotor stress is reduced to plane strain, which can be expressed in Equ.（ I ）.