大功率高速永磁电机的损耗与温升等影响电机功率密度的提高。以500 kW、12 000 r/min高速永磁电机为例，分析了电机极对数、定子绕组形式、转子结构、永磁体等对电机性能特别是损耗的影响。采用电机的有限元仿真模型，对电机的转子结构强度、输出性能、损耗进行了分析计算。试制了样机并对相关性能进行试验验证，分析计算与试验结果均表明，电机达到了较高的技术指标要求，为高速永磁电机的优化设计提供了参考。

The loss and temperature rise of high-power and high-speed permanent magnet motor affect the improvement of power density. Taking a 500 kW, 12 000 r/min high-speed permanent magnet motor as an example, the effects of the selection of pole-pair number, stator winding type, rotor structure and permanent magnet on motor performances, especially on loss, are analyzed. The finite element model of the motor is established, and the rotor structure strength, output performance and loss of the motor are analyzed and calculated. The prototype is trial-produced, and the relevant performances are tested and verified. The results show that the motor has reached a high technical target. It provides some meaningful references for the optimal design of high-speed permanent magnet motor.