高速永磁电机转子多场综合设计

摘要

The strength and dynamic characteristic analyses of rotor are key techniques for the design of high-speed permanent magnet（PM） motor.The comprehensive design of high speed PM rotor should be performed based on strength,electromagnetic and dynamic characteristics.The finite element method was used to analyze stress field,electromagnetic field and mode of rotor.The multi-field iteration comprehensive design was carried out with the optimal design module of finite element software.The variation range of rotor diameter was determined through the strength analysis.The structure of PM and the axial size of rotor were selected according to the requirement in the output power of motor.The rotor length was determined on basis of the dynamic requests.The comprehensive design results with meeting the requests in strength,critical speed and electromagnetic characteristics were achieved through the multi-field comprehensive analysis for the rotor.The design and manufacture of a 100kW high-speed PM machine with rated speed of 60000rpm were conducted with the present method.The practical experiments for the motor validate the correctness of the present method.%由于转子的强度和动力学分析是高速永磁电机设计的关键问题,因此必须对高速永磁转子进行基于强度、电磁及动力学特性的综合设计.采用有限元方法对转子进行应力场、电磁场及模态分析,并利用有限元软件优化设计模块,对转子结构进行多场迭代综合设计.通过强度分析确定了转子外径允许变化范围,根据电机的输出功率要求,选取了永磁体结构和转子的轴向尺寸.根据动力学要求确定转子长度,通过对转子多场综合设计得到满足强度、临界转速和电磁性能的转子综合设计结果,并以100 kW,60 000 r/m in高速电机为例进行设计和制造,电机实验验证了设计方法的正确性.