Fuzzy Logic Control Based Torque Ripple Minimization in Brushless DC Motor using Modified SEPIC Converter

Abstract

The generated torque ripples from the BLDC motor is the main issue that affects the drive performance of the BLDC drive system. In this concept, a new switching technique to minimize the torque ripples due to current commutation is proposed. The presented scheme has been implemented using a commercial and low-cost mid-range PIC microcontroller to generate the modified pulse width modulation (PWM) control signals. An analysis of phase current during commutation time is carried out. Simulation results verify the effectiveness of proposed method. Results had shown a smoother output torque and current produced in comparison with that using conventional PWM control technique with an average of 50 % reduction in the generated torque ripples. Brushless DC (BLDC) motor has a permanent magnet rotor and a wound field stator, which is connected to a power electronic switching circuit. The availability of high energy- density permanent magnet (PM) materials at competitive prices, the commercial availability of low-cost microtone- trolleys and reduction in cost of powerful fast digital signal processors (DSPs) along with the advances in semiconductor-tor power switches have opened up wider area for permanent magnet brushless motor drives to be a competitive solution meeting the market demands due to their control simplicity, low torque per weight ratio and compact construction. The proposed concept can be implemented to Communication Torque Ripple Reduction in Brushless DC Motor using current control technique by using Matlab/Simulink software