Abstract
In this work we implement a Sensorless speed control for three phase Permanent Magnet Synchronous Motor (PMSM) using the Backstepping Control. Only stator currents and voltages are used for feedback to design a non linear control algorithm which tracks the speed of PMSM with parametric uncertainties and under varying load. A continuous sliding mode observer (SMO) based on sigmoid function is used for rotor position estimation in cascade with an extended high gain observer (EHGO) for robust speed estimation that reduces chattering phenomenon and improve accuracy. This removes the requirement of filter and phase delay compensation. For control of speed, current tracking backstepping controllers are designed which show excellent tracking of reference speed and are prone to parametric uncertainties. Finally the simulation results validate the performance of the proposed controller and observers
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