不同极槽配合电动汽车永磁同步电机弱磁性能及抗饱和能力研究

电动汽车永磁同步电动机需要宽的调速范围，但在高速弱磁时,铁心的饱和带来了较大的反电势失真和转矩波动，影响电机的运行性能。本文比较分析不同极槽配合的内置永磁同步电机高速弱磁工况的反电动势、电磁转矩和转矩波动情况。仿真分析表明，在高速弱磁条件下与分数槽电机相比，整数槽永磁同步电动机具有较高的反电势失真率和转矩波动；其中36槽8极电机弱磁能力最好，18槽8极电机转矩波动最小。

Research on flux weakening performance and anti-saturation capability of IPM machines having different pole/slot number combinations

Permanent magnet synchronous motor of electric vehicle requires wide speed regulation range.However, in the flux weakening region, the saturation of motor core causes back EMF distortion and torque ripple, and affects the performance of motor. In this paper, back EMF, electromagnetic torque and torque ripple of the the interior permanent magnet synchronous machine (IPMSM) with different slot/pole number combinations are compared in the flux weakening region. Simulation results show that the integer slot IPMSM has higher back EMF distortion rate and torque ripple than the fractional slot IPMSM in the flux weakening region. In fractional slot IPMSM, the motor with 36-slot and 8-pole has the widest speed adjustable range and the motor with 18-slot and 8-pole has the minimum torque ripple.