Design Implementation of Speed Controller Using Extended Kalman Filter for PMSM

A novel design implementation of proportional– integral–differential 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. Then, a proportional integral derivative (PID) controller is developed based on Linear Quadratic Regulator (LQR) to achieve speed command tracking performance. In the present method, the speed and q-axis current are estimated accurately using the EKF algorithm. The steady state and transient state response of the overall system is greatly enhanced and also the speed control is achieved effectively under load disturbance. The experimental results for the speed response and q-axis current as well as the control signal variations when the PMSM is subjected to the load disturbance are presented. The results verify the effectiveness of the proposed method.

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