关键词: 直流母线电压, 永磁同步电机, 电机损耗, 电机效率

Abstract: The relationship between different motor losses and DC bus voltage was analyzed, and the motor efficiency of a permanent magnet synchronous motor ( PMSM) under different DC bus voltages was test. The results showed that the iron core loss increased with the increase of DC bus voltage. In the low-speed stage, the stator copper loss and stray loss were not affected by the DC bus voltage, while in the high-speed stage, the higher the DC bus voltage, the smaller the stator copper loss and stray loss. The proportion of high-efficiency working area of motor efficiency increased with the increase of DC bus voltage, and moved to high-speed and high-torque direction with the increase of DC bus voltage.

Key words: permanent magnet synchronous motor( PMSM), DC bus voltage, motor losses, motor efficiency