Modeling and speed control of permanent magnet synchronous Motor at constant load torque using PSIM

This paper deals with modeling and speed control of a permanent magnet synchronous Motor (PMSM) drive system in PSIM. At present in drives industry only two types of permanent magnet motors are available. These are Brushless DC Motor (BLDC) drive with a trapezoidal flux distribution and PMSM drive with sinusoidal flux distribution which eliminates the torque ripple caused by the commutation. A closed loop control system with a Proportional Integral (PI) controller and Current controller to control the speed has been designed to operate in constant torque regions and its Implementation has been done in PSIM. PSIM is a software, which has user friendly approach and some basic theories, the corresponding PSIM models for the PMSM can easily be constructed.