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Sensorless Control Technique of PMSM Based on RLS On-Line Parameter Identification

A sensorless control strategy based on extended electromotive force (EEMF) combined with the on-line parameter identification for permanent magnet synchronous motor (PMSM) is proposed in this paper. Based on the mathematical model of PMSM, the EEMF observer is designed. The phase-lock loop (PLL) technique is used to detect the rotor angular speed and position. In order to eliminate the effect of variations in motor parameters on the accuracy of the sensorless algorithm, the recursive least square (RLS) algorithm is adapted for PMSM parameter identification. Then, the results of the parameter identification are used for sensorless control algorithm. The simulation model is built in Simulink. The results demonstrate that the proposed control strategy is effective.