基于高频方波注入的永磁同步电机转矩脉动抑制策略

传统的高频方波注入法，利用转子的饱和凸极效应，可提升转速控制精度，但该方法也导致电流中含有大量的谐波而产生畸变，对电机的转矩脉动产生负面影响。在传统高频方波注入法的基础上，通过谐波电流抑制算法，利用坐标变换及低通滤波器采集出5、7次电流谐波分量，将采集的数据经过谐波电压补偿。提出了一种谐波抑制高频注入的方法。该方法消除电机工作中电流谐波分量，达到抑制转矩脉动的目的。仿真和实验结果表明了该算法可以有效地抑制定子电流的畸变，降低转矩脉动，且具有较高的灵活性。

Torque ripple suppression strategy for permanent magnet synchronous motor based on high frequency square wave injection

The traditional high-frequency square wave injection method can improve the speed control accuracy via the saturated saliency effect of the rotor. But the distortion is also caused by this method because of the current containing a large number of harmonics. There is a negative impact on the torque ripple of the motor. In this paper, through the harmonic current suppression algorithm, the 5th and 7th current harmonic components are collected by coordinate transformation and low-pass filter, and the collected data is subjected to harmonic voltage compensation. A harmonic suppression high frequency injection method is proposed. The harmonic current component is eliminated by the proposed method in the motor operation, and the purpose of suppressing the torque ripple is achieved. Simulation and experimental results show that the algorithm can effectively suppress the distortion of stator current, reduce torque ripple, and has high flexibility.