INVESTIGATIONS ON DYNAMIC BEHAVIOR OF PERMANENT-MAGNET BRUSHLESS DC MOTOR DRIVE

permanent magnet brushless de (PMBLDC) motors are increasingly being u sed in a wide range of applications such as machine tools, robotics an d high precision servo applications. A comprehensive analysis which in cludes modeling and simulation of PMBLDC motor drive is presented in t his paper. A mathematical model of the drive is developed with a view to studying the transient response of current controlled voltage sourc e inverter (VSI) fed PMBLDC motor. The drive system consists of discre te PID(Proportional, integral plus derivative) speed controller, the r eference current generator, the position sensor, an inverter and the m otor. Each part of the drive system is modeled separately and then int egrated to study the dynamic behavior of the drive system. The study a lso examines the effectiveness of the drive system during starting, lo ad perturbation, speed reversal and de link voltage fluctuation.