电动汽车轮边直驱永磁电机转矩脉动优化

Optimization for Torque Ripple of Permanent-Magnet Motor in Wheeled Edge of Electric Vehicle

由于电动汽车对永磁电机的振动噪声要求很严格,所以在电磁设计的过程中就要考虑振动噪声的问题,应在电磁设计的源头解决。齿槽转矩会使电机产生振动和噪声,出现转速波动,导致电机不能平稳运行,影响电机的性能。在变速驱动中,当转矩脉动频率与定子或转子的机械共振频率一致时,齿槽转矩产生的振动和噪声将被成倍的放大。现采用绕组短距和斜级的方式对转矩脉动进行了优化,达到了较好的结果。

Because vibration and noise requirements of permanent-magnet motor for electric vehicle is very strict,the vibration and noise problems have to be considered in the process of electromagnetic design and should be addressed at the source of it. The cogging torque will make the motor produce vibration and noise,cause speed fluctuation,and then result in unstable operation and affect performance of the motor. When the frequency of torque ripple coincides with that of mechanical resonance of stator or rotor in variable-speed driving,the vibration and noise generated by the cogging torque will be magnified by scale. The torque ripple has been optimized by using short-distance windings and skew slot,so as to achieve the better results.