SAZZ Converter Fed Fuzzy Logic Speed Controlled BLDC Motor Drive

Abstract

AbstractBLDC motors possess high torque than the same rated Induction motor. Due to electronic commutation and the absence of mechanic commutation and brushes, BLDC motors are widely used in many industrial applications. The main disadvantage of BLDC motor is high torque ripple. Commutation Ripple reduction of brushless direct current (BLDC) motor torque using the SAZZ converter is proposed in this work; torque ripple is proposed to carry out under both conduction and commutation intervals in this proposed work. The fuzzy logic speed controller is used for generating reference pulse in the conduction interval by processing the speed error. The performance of torque and speed based on the proposed control method was analyzed. MATLAB/Simulink platform is used for implementing as well as showing effective implementation of the proposed technique. PI and Fuzzy logic control are used for evaluating the performance. SAZZ (Snubber Assisted Zero Voltage and Zero Current Transition) topology was proposed to reduce switching losses. The main switch snubber circuit reduces the voltage during turn off, and the auxiliary circuit discharges the snubber before the next switching cycle.KeywordsBLDC motorSAZZ converterFuzzy logic controller