Robust sensorless speed observer-controller scheme for Permanent Magnet Synchronous Motor

In this paper, is proposed a robust sensorless speed observer-controller scheme for a Permanent Magnet Synchronous Motor (PMSM) based on the use of an Extended Kalman Filter (EKF) to estimate both position and speed, without any mechanical sensor. Then, a state-feedback optimal control algorithm is developed for uncertain of PMSM, based on the use of an Algebraic Riccati Equation (ARE) and a convex optimization approach. The robustness of this method, with respect to the parameters uncertainties, is tested, with success, for fourth order model of the studied process.