Performance comparison of feedback linearised controller with PI controller for PMSM speed regulation

The performance of a feedback linearised (FBL) controller is compared with a 3 loop proportional plus integral (PI) controller for the speed control of a permanent magnet synchronous motor (PMSM). The performance of each controller is evaluated by studying the transient speed response to step changes in reference speed. A flux weakening algorithm is adopted to compare the performance of each controller during operation in the highly nonlinear constant power region. The sensitivity of each controller to changes in motor parameters is investigated. A discrete time implementation of the FBL controller is simulated. The effect of inaccuracy in the estimation of the rotor acceleration on the performance of the FBL controller is discussed. A speed and load torque observer is simulated for estimation of the speed and acceleration and the performance of the digital FBL controller with this observer is predicted.