Ellipse-trajectory-oriented vector control for energy efficient/wide-speed-range drives of sensorless PMSM

This paper proposes a new sensorless vector control method for energy-efficient and wide-speed-range drives of permanent-magnet synchronous motors. The proposed sensorless method is endowed with all of the following functions: 1) wide-speed-range drive under voltage limit, 2) current limitation, 3) high-efficiency. These functions are realized in a very simple manner and can operate adaptively in all sensorless driving modes including motoring/regenerating, steady/transient states. The usefulness of the proposed method is verified by extensive experiments.