Improved Dynamic Performance of Permanent Magnet Synchronous Motor using Maximum Torque Per Ampere with reduced number of switches

Abstract

To attain the excellent dynamic performance of any drive the torque ripples must be as minimum as possible. Otherwise which leads to oscillations in a speed profile and hence results in poor performance of a drive. The proposal of this work is to reduce as minimum as possible in torque ripples of a Permanent Magnet Synchronous Motor (PMSM) by means of a Five Level Space Vector Modulation (SVM). The SVM is used to generate gate pulses for an Inverter. Maximum Torque per Ampere (MTPA) is considered which ensures minimum ohmic losses. To reduce the reduces number of switching states and hence switching losses and to generate gate pulses to a five level inverter, three level inverter using SVM is taken as a reference. To verify the designed system, a simulator is implemented in MATLAB software environment and a comparison of results with and without MTPA control is being shown. Results clearly show that torque ripple, THD of motor phase voltage and current are greatly reduced under MTPA control.