Four quadrant operation and control of three phase BLDC motor without loss of power

Brushless DC motors are extensively being used in wide spectrum of applications including aerospace, automation, computers, military, household appliances and traction because of their properties such as compact size, higher efficiency and longer lifespan. There is a need for an efficient control strategy for these motors. The control of BLDC motor in four quadrants is very crucial. In this paper, BLDC motor is controlled in all the four quadrants, without any wastage of power. During regenerative braking period, power generated is being stored in the chargeable battery. This concept is important where there is frequent reversal of direction of rotation of motor is needed. MATLAB/SIMULINK software is used to carry out the above investigation.