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The advantages of operating a permanent magnet synchronous machine (PMSM) without a position sensor are many and are well known. In this paper the self sensing performance of two off the shelf industrial PMSMs and an aerospace PMSM will be compared for their sensorless control properties. The properties of the main modulating tracking saliency will be investigated as a function of load. The machines...
This paper proposes the design method of adaptive rotor flux observer gain to improve stability at low speed and regenerating mode. The method is based on the stability analysis. The stability analysis utilizes the linearized model considering all systems including each control loop. Therefore the proposed method considers the effects of motor constants and control circuit constants. The stability...
This paper proposes two new techniques to improve the transient torque response in presence of axial saturation due to skewing of rotor slots in induction motors. The effect of skew is to cause significant air-gap flux path saturation at one axial-end element of the rotor, loss of flux, and, consequently, of drive performance. The induction motor operations with variable q-axis current command during...
The paper investigates the improvement in sensorless vector control of induction machines through the use of a non-linear feedback integrator embedded in a standard rotor flux model reference adaptive system (MRAS)-based observer. The feedback integrator compensates for drift and dc-offset and is capable of open loop flux estimation down to frequencies below 0.1 Hz. The paper presents experimental...
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