Comparison of Estimation Techniques Between Linearized Estimatosr and Extended Kalman Filters for PMSM

Three-phase Permanent magnet synchronous motor (PMSM) is a multi-variable, non-linear, strong coupling system. Due to the non-linearity of PMSM, it is a challenge to exactly control the speed, torque and position. This paper presents two methods for estimating state variables of the PMSM using the Linearized Estimators (LE) and Extended Kalman Filter Estimators (EKF). The estimated variables are stator currents,, velocity and angular position of rotor. The estimation signal and feedback are used to speed controller and current controller of PMSM. The responses of the control system in two cases are compared and then the conclusions are drawn