关键词: 高速永磁同步电机, 损耗计算, 自扇冷, 流固耦合, 流体场, 温度场

Abstract: Aiming at the problem that the high frequency and high harmonics of high-power high-speed permanent magnet motors cause excessive temperature rise of the rotor,a self-fan cooling and water cooling hybrid cooling heat dissipation structure was designed. The high-speed rotating fan blades were used to accelerate the air flow inside the motor,accelerate the heat exchange between the motor and the outside,and establish the coupling contact surface between the fluid and the solid. The fluid-solid coupling method was used to calculate the heat transfer coupling problem between the fluid and the motor. The finite element method was used to simulate the electromagnetic field of the motor under the rated state,and the motor loss and heat source distribution were obtained. On this basis,the fluid change of the motor at the rated speed and the temperature rise distribution of the motor were analyzed. The simulation analysis shows that the self-fan cooling structure reasonably improves the fluid heat dissipation path and effectively reduces the temperature rise of the rotor.

Key words: high speed permanent magnet synchronous motor, loss calculation, self-fan cooling, fluid-solid coupling, fluid field, temperature field