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In permanent magnet (PM) machine drives, the initial position is typically estimated based on the machine inductance variation and the flux saturation. The saliency-based method using the voltage signal injection has demonstrated the reliable position estimation for high salient PM machines at initial state. However considering the saliency-based drive on low salient machines, several implementation...
The motor speed of an induction machine can be accurately estimated by utilizing speed-dependent harmonics in the stator current. This paper presents a PLL-based approach to identify one of these harmonics and reduce bandwidth-limiting filtering operations. Experimental results show the ability for tracking dynamic speed transitions.
To decouple strong secondary saliencies in sensorless AC drives, a repetitive control method in an angle domain is proposed. This method regards secondary saliencies as periodic disturbances relative to electrical angle and generates the same saliencies to compensate them. The proposed method is easy to implement and proved effective by experiments.
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