静态负序电流对高频信号注入法估计转子位置的影响及应对策略

高频信号注入法是利用高频电流的负序分量来估计电机转子位置的。由于电机的不对称因素的存在,使得负序电流中含有与转子位置无关的分量,这种静态负序电流会给转子位置的估计带来困难。本文分析了静态负序电流产生的原因及其在高频信号注入法的应用中所造成产生的影响,并提出了相应的解决措施,实验证明这些措施取得了很好的效果。

Influence of static negative sequence current in method of high-frequency signal injection and the strategy to cope with

Making use of the negative sequence component of high frequency current to estimate the rotor position of permanent-magnet-synchronous motor is what the method of high frequency voltage signal injection does.But the negative sequence current component is not only related to saliency-pole,the winding's asymmetry can also result in negative sequence current component,which has nothing to do with the saliencies and can be called static-negative-sequence-current.Apparently this kind of negative sequence current component will give rise to errors to the estimation of position.This paper analyzed the reason the asymmetry occurred and the effects it made,and a kind of measures to eliminate the staticnegative-sequence-current is also presented.The experimental results indicated that all the solutions worked well.