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

Abstract

The permanent synchronous motor drive system incorporates magnetic bearings to perform speed control and balance rotor control between
the two stators. The paper studies adjusting motor speed sensorless based on measured current components. The electromotive force (backEMF) generated in the stator is estimated by a High-Gainobserver.Theangularpositionandvelocityrotoriscalculatedthroughtheα-β
components of the back-EMF. The motor drive is built in a vector control structure based on the rotor flux, using PID controllers to control
rotor position and speed. The speed feedback signal is taken from the output of the High-Gain observer. Simulation results in MatlabSimulink software show that the output speed value of the drive follows the desired trajectory, and the rotor is controlled in the equilibrium
position. This also indicates that the High-Gain Observer has a very good speed estimation.