电动汽车混合永磁辅助磁阻同步电机研究

Research on Hybrid Permanent Magnet Assisted Synchronous Reluctance Motor for Electric Vehicle

针对铁氧体永磁辅助式同步磁阻电机可能出现的不可逆退磁问题,研究了电动汽车驱动用铁氧体和钕铁硼混合永磁辅助磁阻同步电机。用有限元方法研究了混合永磁辅助磁阻同步电机的转子结构,包括磁钢槽形状和相关尺寸的优化,重点研究电机峰值工况下铁氧体的不可逆退磁问题,并与其他电机做了比较分析。研究结果表明,混合永磁电机与铁氧体电机成本接近,但转矩脉动率小,并较好地解决了铁氧体永磁材料的不可逆退磁问题。

In view of the possible irreversible demagnetization problem of ferrite permanent magnet-assisted synchronous reluctance motor,ferrite and Nd Fe B hybrid permanent magnet assisted synchronous reluctance for electric vehicle was studied. The rotor structure of hybrid permanent magnet assisted synchronous reluctance motor was discussed by finite element method,including the optimization of the shape and the relative size of the magnetic steel groove,irreversible demagnetization of ferrite under the peak condition was studied and made the comparative analysis with other motors. The results show that the cost of the hybrid permanent magnet motor was closed to that of the ferrite,but the torque ripple rate was low,and the irreversible demagnetization problem of the ferrite permanent magnet material is well solved.