Regenerative Braking with Duty Cycle Settings for Brushless DC Motor

Brushless DC (BLDC) motor are widely used in many applications such as electric vehicle, house appliances, etc. A proper control for such motor is required to achieve better performance. For electric vehicle applications, regenerative braking is needed to make such vehicle can travel longer distance. This paper presents a control strategy for regenerative braking with variable duty cycle, by setting the duty cycle the output voltage of the converter can be increase more than the battery voltage under different speed of the motor. This concept can save more electric energy. To verify the analysis, experimental works were done. These showed that different duty cycle gave different current level flowing to the battery.