Research on Efficiency Optimization Control Strategy of Permanent Magnet Synchronous Motor System

Abstract

A loss minimization strategy for PMSMs is proposed in this paper, which is based on direct torque control (DTC) loss model.The problem of large torque and flux ripple in traditional direct torque control is improved by space vector pulse width modulation (SVPWM) technology.Through the analysis of the relationship among motor loss ,current and stator flux linkage, a mathematical model of motor loss is established to obtain the optimal direct-axis current and stator flux linkage. For different motor operating conditions, the stator flux linkage is adjusted online to meet the maximum efficiency of the motor.The simulation results verify that the proposed method reduces the torque and stator flux linkage ripple and improve the efficiency of PMSM system under light load and wide range speed.The efficiency of PMSM motor system is increased from 0.90 to 0.95.