Ripple Reduction of BLDC using Direct Torque Control

Abstract: Brushless DC motor has a rotor with permanent magnet and has no mechanical commutator which leads to many advantages like less maintenance, long life, high reliability, low inertia, low friction and low noise. Since the brush system/commutator assembly is replaced by an electronic controller which can be easily integrated into other required electronics, thereby improving the effective power to weight and power to volume ratio. To minimize the torque ripple using conventional current controller and the direct torque controller in BLDC motor using SIMULINK and to verify the results by simulation. . In this paper the direct torque control method is employed to improve its torque ripple content which is been compared with conventional method by using MATLAB software and the result where comprehensively presented through extensive simulations which shows successfully mitigating almost 50% of ripple.

Keywords: DTC, BLDC, ripple, Hall Effect, current controller.