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A novel design of a proportional-integraldifferential equivalent controller using state observer based Extended Kalman Filter (EKF) for a Permanent Magnet Synchronous Motor (PMSM) is proposed. The EKF is constructed to achieve a precise estimation of the speed and current from the noisy measurement. Linear Quadratic Regulator (LQR) technique is used to construct a proportional integral derivative (PID) controller to achieve the speed command tracking performance. The proposed method greatly enhances the speed control performance. The simulation results for the speed response and variation of the states when the PMSM is subjected to the load disturbance are presented. The results verify the effectiveness of the proposed method.

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