关键词: 高速永磁同步电机, 复合护套, 转子强度分析, 温度场分析

Abstract: Surface-mounted high-speed permanent magnet synchronous motors often use non-magnetic alloy steel or non-metallic composite materials as protective sleeves to fix the permanent magnets. A power 45 kW,speed 45 000 r/min surface-mounted high-speed permanent magnet motor was taken as the research object. The finite element method was used to analyze the mechanical stress,eddy current loss,temperature field,and thermal stress of the sleeve structures,which were double-layer titanium alloy,outer titanium alloy with inner carbon fiber,and outer carbon fiber with inner titanium alloy,and the comparative analysis was carried out. Compared with a single-layer titanium alloy sleeve, a multi-layer titanium alloy sleeve can reduce the sleeve thickness and improve stress distribution,while multi-layer composite sleeves can also meet the rotor strength requirements. Compared with the double-layer titanium alloy sleeve,the composite sleeve has less eddy current loss. Under the same cooling,the stator side temperature of the composite sleeve was unchanged,but the temperature of the rotor side was reduced. The thermal stress coupling reflected the influence of the uneven distribution of the rotor temperature field on the rotor stress distribution.