Performance analysis of a BLDC drive under varying load

Increasingly growing trend towards usage of green and eco friendly electrical devices has lead to research development in Brushless DC (BLDC) motors. The BLDC motors exhibit better performance in terms of higher efficiency, higher torque under low speed range, higher power density, lower maintenance and lesser noise than other motors. BLDC motors can act as acceptable alternatives as against the conventional motors like Induction Motors, Switched Reluctance Motors etc. In this paper, a BLDC motor has been modeled in MATLAB/ SIMULINK environment using appropriate mathematical interventions. The performance of the motor has been analyzed for 120 degree mode of operation. Step and gradual changes in the load have been done to get the response of the motor. A PI controller has been deployed for closed loop speed control of the motor. It is observed that the performance of the motor is much better if the load is applied gradually instead of applying it suddenly.