Torque Ripple Reduction in Permanent Magnet Synchronous Motor using Predective Control Scheme

Abstract

In Permanent magnet synchronous motor, high performance motion control is mostly carried out using Field Oriented Control and more recently Direct Torque Control is being used. The main advantages of direct torque control (DTC) technique of permanent magnet synchronous motor (PMSM) are eliminating the current controller and quicker dynamic response. But, high torque and stator flux ripples are the drawbacks in the technique. In order to overcome these drawbacks, a Torque Predictive Control (TPC) scheme is proposed. It is a mathematical approach to minimize the torque ripple. It uses the relationship between stator flux, stator voltage and incremental torque. It decides the proper direction of voltage vector usto drive torque error to zero. Normally, sensors are used to measure the speed and rotor position. Sensors increase the complexity with reduced reliability. In order to overcome these problems, speed is extracted from the d axis output voltage of synchronous current regulator in the proposed scheme.  Simulation results are presented for the proposed TPC scheme to showbetter torque response with less ripples.