Speed Sensorless Control of PMSM–Magnetic Bearing Systems Using High-Gain Observer

Abstract

Permanent synchronous motor (PMSM) drive systems incorporates magnetic bearings performing speed control and rotor balancing control between the two stators simultaneously. This paper deals with adjusting the motor speed based on the stator current components measurement. The back electromotive force (back-EMF) generated in the stator is estimated by a high-gain observer. A rotor angular position and velocity are calculated through α -β components of the back-EMF. A motor drive is built in a vector control structure based on the rotor flux, using PID controllers to control rotor position and speed. A speed feedback signal is taken from the output of the High-Gain observer. Simulation results on Matlab-Simulink software show that the output speed value follows the set trajectory, and the rotor is controlled in the equilibrium position. This mean that the High-Gain Observer has good estimations.