Speed and Torque Ripple Reduction of the Brushless DC Motor using Voltage and Current Controller

Abstract- The main objective of this paper is to build a simple current and voltage controlled modulation techniques with filters for brushless dc motors using PSIM software. A wide range of torque and speed control of the electric motor is required in most applications. Because of fast response, low inertia, high reliability and maintenance free advantages of brushless dc motors, it is used in applications which required wide range of speed and torque control. The conventional dc machine fulfills these requirements, but the disadvantage of conventional dc machine is it requires constant maintenance. Brushless dc motor required less maintenance because permanent magnet is used so they do not have brushes. Under ideal condition with trapezoidal back emf the torque produced by the brushless dc motors is constant. However in practice the torque ripple appears on the delivered output toque. In armature current the harmonics is produce because of brushless dc motors uses power electronic switches for the commutation purpose. In this paper voltage and current controllers are used to reduce speed and torque ripples