Digital Signal Controller Based Four Switch Three Phase Inverter Fed BLDC Motor Control

Brushless Direct Current Motors (BLDC) are used in many applications for their low cost, high performance , ease of control, less maintenance because of absence of commutators and brushes and high efficiency. These advantages of BLDC motors have led to their wide spread use in variable speed drives. The main objective of this paper is to develop a drive system for BLDC motor with reduced switches and minimum hardware. The proposed work is based on, the dsPIC controlled four switch three phase inverter fed BLDC motor drive. The advantage of this inverter that uses four switches instead of conventional six switches is lesser switching losses, lower electromagnetic interference (EMI), less complexity and reduced interference circuit. dsPIC30F4011 digital controller is used to generate the switching pulses for Four Switch Three Phase Inverter consists of MOSFET Switches to drive the BLDC motor. Simulation and experimental work are carried out and results are presented. A simulation is carried out using MATLAB/SIMULINK and in the experimental work a prototype model is constructed to verify the simulation results.