Universal Sensorless Vector Control of Induction and Permanent-Magnet Synchronous Motors Considering Equivalent Iron Loss Resistance

This paper presents a novel encoder-less vector control strategy which is universally applicable to both induction motors (IMs) and permanent-magnet synchronous motors (PMSMs). A fast rotor flux linkage phase estimator using stator flux linkage information obtained by a high-precision approximation voltage integral with error compensation is shown. Using this estimator, the authors construct a unified position/speed sensorless vector control algorithm taking equivalent iron loss resistance into account. All electrical motor parameters used for the control can be measured from unified off-line tests. The proposed universal sensorless vector control is implemented on a 0.4-kW squirrel-cage IM, a 0.4-kW interior PMSM with concentrated winding, and a 0.3-kW surface PMSM with distributed winding. Experimental results of several driving tests demonstrate the validity of the proposed.