Modeling and Simulation of Nonlinear Permanent Magnet Synchronous Motor

Abstract

Due to the influence of non-ideal sine wave back electromotive force (back EMF), the current and torque ripples of permanent magnet synchronous motor (PMSM) may be increased. So some novel mathematic models of PMSM considering non-ideal back EMF are deduced to investigate this phenomenon. Based on the nonlinear models of PMSM, a double-loop control system using vector control and SVPWM is constructed with MATLAB/Simulink. The simulation experiments are carried out under no-load and load-carrying conditions. Experiments results show that the stator current and electromagnetic torque of nonlinear PMSM contains higher harmonics using conventional dq-axis vector control.