基于相电流正负序分量相角差的高精度内置式永磁同步电机转子初始位置检测方法

High-Precision Estimation Method of Initial Rotor Position for IPMSM Based on Phase Difference of Positive and Negative Sequence Current Component

对内置式永磁同步电机(IPMSM)转子静止初始位置检测技术进行研究,提出一种基于高频信号注入法的高精度IPMSM初始位置检测方法。该方法通过向电机绕组中注入高频旋转电压信号,通过带通滤波器得到高频电流响应,利用同步旋转坐标变换将高频电流响应的正、负序分量进行分离;然后分别对三相高频电流正、负序分量的相角进行最小二乘估计,利用任意一相高频电流正、负序分量的相角差提取出转子的位置信息;最后通过磁路饱和效应对转子N、S极性进行辨别。该方法具有较高的检测准确度,平均检测误差约为1.73°电角度,对一台11 k W的内置式永磁同步电机的实验表明了该方法的正确性。

On the basis of the research on static initial position detection technology of interior permanent magnet synchronous motor（ IPMSM）,a new high-precision method based on high-frequency signal injection is suggested. In the proposed method, a high-frequency rotating voltage was superimposed in the control voltage first,then the high-frequency current component was obtained by band-pass filtering of the three-phase current signal,and the positive and negative sequence components of high-frequency current response were separated by using synchronous rotating coordinate transformation,the phase of positive and negative sequence components of the three-phase high-frequency current response was extracted by the least square algorithm,the rotor position was obtained by using the difference of arbitrary phase current of positive and negative sequence components phase. Finally the NS poles was distinguished by using motor magnetic saturation effect. The method has highprecision detection accuracy, and the average detection error is about 1. 73 degrees（ electric angle）. The experimental results show the correctness of the proposed method.