Speed sensorless flatness-based control of PMSM using a second order sliding mode observer

This paper deals with speed sensorless flatness based control of permanent magnet synchronous motor (PMSM) using a second order sliding mode observer. In the first part, the flatness control is associated with PI controller, this solution shows good robustness with respect to parameter variations and guarantees torque and speed tracking. In the second part, the high order sliding mode speed observer is used to overcome the occurring chattering phenomena. The super twisting algorithm is modified in order to design a speed and position observer for PMSM. The simulation results confirm the effectiveness and the good performance of the proposed control.

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