Minimization of Torque Ripple of Brushless DC Motor Using HCC with DC-DC Converter

Abstract

This  paper shows the Minimization of Torque Ripple of Brushless DC Motor Using Hysteresis Current Control. The speed of the BLDC motor is controlled by varying the dc-bus voltage of a voltage source inverter (VSI) which uses a low frequency switching of VSI for low switching losses. A diode bridge rectifier followed by a DC-DC converter working in a discontinuous conduction mode (DCM) is used for control of dc-link voltage with unity power factor at ac mains. Performance of the DC-DC converter is evaluated under four different operating conditions of discontinuous and continuous conduction modes (CCM). This project deals with a DC-DC converter-fed brushless dc motor (BLDC) drive as a cost-effective solution for low-power applications. Moreover, two control strategies for BLDC motor drive have been implemented. One of the control strategies is based on DC-DC converter fed BLDCM drive and another one is Hysteresis current controller fed BLDC motor drive. Comparison has been made between the two control strategies is in terms of minimization of Torque ripple for different operating speeds. The proposed work has been implemented under MATLAB/Simulink environment.