CONTROL OF BRUSHLESS DC MOTOR FOR SPEED CONTROL APPLICATION

Abstract

Brushless DC motors have a permanent-magnet rotor, and the stator windings are wound such that the back electromotive force (EMF) is trapezoidal. It therefore requires rectangular-shaped stator phase currents to produce constant torque. The Motors possess high torque/weight ratio, operate at very high speed, are very compact and are electronically controlled. Due to absence of mechanical brushes they require lesser maintenance. It is therefore, they replacing DC motor in variable speed servo applications. The desired excitation of machine could be made possible due to the rapid developments made in the field of power electronics and power digital signal processors (DSPs). In this dissertation, a e brushless DC motor drive system has been analyzed, designed, modeled, simulated and developed. A comprehensive mathematical modeling of brushless DC motor ,its drive system is developed using SIMULINK and sim-powersystem blockset under MATLAB environment The dynamic resp...