Abstract

Brushless DC motors have gained popularity in electric drives applications such as industrial automotive equipment’s, instrumentations, aerospace etc due to its higher efficiency, greater reliability, good dynamic response and very low maintenance. This paper presents speed control of four switch three phase inverter fed BLDC with fuzzy logic implementation. Cost saving is achieved by reducing the number of components in the inverter circuit by implementing four switch topologies.The sensorless techniques based on the back EMF difference estimation method is suggested. The design analysis and simulation of the proposed system is done using MATLAB/SIMULINK software. Also, simulation results of sensor drive using PI controller and sensorless drive using fuzzy logic controller are analysed.