Application of AC/DC/AC converter for sensorless nonlinear control of permanent magnet synchronous motor.

In this paper, a nonlinear controller is presented for permanent magnet synchronous motor (PMSM) sensorless drives. The nonlinear controller is designed based on input-output feedback linearization control technique. The extended Kalman filter is used to estimate the speed, position and load torque. The PMSM is fed from indirect power electronics converter. This indirect converter is controlled by the sliding mode technique. This control technique allows the minimization of harmonics introduced by the line converter, including the control of power factor and DC-link voltage. We study the robustness of the overall system using simulation for different operating modes and parameters variation.