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《Advanced Technology of Electrical Engineering and Energy》 2008-03
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Influence of static negative sequence current in method of high-frequency signal injection and the strategy to cope with

ZHONG Li-ping,WANG Chang-song,ZHOU Xiao-min,QI Xin(Mechanical Eng.School,University of Science and Technology Beijing,Beijing 100083,China)  
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.
【CateGory Index】: TM341
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