Low computational cost technique for SPMSM sensorless drive using active flux concept

In this paper, permanent magnet synchronous motor flux control is performed, involving the active flux concept. This flux control is associated with a scalar drive (V/f), being a native sensorless technique, without a special approach. Moreover, the applied strategy has low computational cost and can operate at very reduced speeds, tracking references and rejecting disturbances. The focused application is direct-drive washing machines. Experimental results are presented, including a very low-speed test. The main contribution of this paper is related to the control design.