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COMPARATIVE INVESTIGATION OF SENSORLESS CONTROL WITH TWO HIGH-FREQUENCY SIGNAL INJECTION SCHEMES

QIN Feng,HE Yi-kang,LIU Yi,ZHANG Wei (College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)  
Based on the saliency tracking idea, two high frequency signal injection methods,the rotating high frequency voltage signal injection and fluctuating high frequency voltage signal injection, were discussed. The basic principles of rotor position self-sensing using these high frequency injection and the key techniques in implementation were presented and the simulation models for sensorless vector control systems of a PM synchronous motor were established using two proposed rotor position estimation methods. Comparative study of simulation shows that the saliency-tracking scheme using fluctuating high frequency voltage signal injection possesses simpler configuration and better speed-adjustable performance both in static and dynamic; but it is easier to implement for the saliency-tracking scheme using rotating high frequency voltage signal injection method.
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