新能源汽车用永磁辅助同步磁阻电机噪声及续航优化研究

Research on Noise and Endurance Optimization of Permanent Magnet Assisted Synchronous Reluctance Motor for New Energy Vehicles

永磁辅助同步磁阻电机具有高转矩/功率密度、高效率区间、高转速、低反电动势、低成本等优势,在新能源领域特别是乘用车驱动系统中得到越来越广泛的应用。但该类电机凸极率大、波形畸变大、转矩脉动大,易导致电机振动噪声及效率低下,进而导致整车振动噪声及续航不足等问题。通过增加转子隔磁孔,改变磁路走向的方式,降低了电机全转速段转矩脉动和对应负载气隙感应电动势波形总谐波畸变(THD)。对电机优化前后径向电磁力及谐响应进行仿真对比分析,并通过试验验证了该优化方法的有效性。

Permanent magnet assisted synchronous reluctance motor has the advantages of high torque/power density, high efficiency range, high speed, low back electromotive force(EMF), low cost, etc., so it is more and more widely used in new energy fields, especially passenger vehicle drive systems. However, this kind of motor has high salient pole rate, large waveform distortion and large torque ripple, which are easy to generate problems of vibration noise and low efficiency of the motor, resulting in the whole vehicle vibration noise and insufficient battery life. By adding the rotor magnetic isolation holes and changing the direction of the magnetic circuit, the torque ripple at the full speed range of the motor and the total harmonic distortion(THD) content of the corresponding load air gap induced EMF waveform are reduced. The radial electromagnetic force and harmonic response of the motor before and after optimization are compared and analyzed. Finally, the effectiveness of the optimization method is proved by experiments.