永磁同步电机静止及低速下无传感器控制研究

摘要

In order to achieve the estimation of rotor position of IPMSM at low speed and zero speed, a scheme based on high frequency injection method for sensorless control of permanent magnet synchronous motor was presented. The basic principal of high frequency injection method was discussed combined with the mathematical model of PMSPM in detail. In consideration of the magnetically saturated saliency, the high frequency response character of PMSM was studied, based on which a new method extracting the DC component of high frequency current was proposed for distinguishing the rotor polarity at zero speed. The impact and compensation of phase deviation of high frequency current was also discussed. The experiment result shows that the methods adopted have satisfies performance at both zero speed and low speed.%研究了一种基于高频注入法的永磁同步电机无传感器控制技术,以实现内埋式永磁同步电机在静止及低速下转子位置的估算.结合电机数学模型阐述了脉振注入法的原理.利用电机的饱和凸极性,分析了电机在静止时的高频响应特性,并提出了一种通过提取高频电流直流分量来判断电机转子极性的方法.为r解决响应电流存在相位偏移的问题,将d轴高频电流作为输入量,通过锁相环得到响应电流的相位偏移值,并做出相应的补偿.实验结果表明,采用的方法跟踪性能良好,适用于电机的静止以及低速运行阶段.