Analysis and Design of BLDC Motor Control in Regenerative Braking

Brushless DC motor is suitable to be implemented in electric vehicles since it can provide high torque and is capable to do regenerative braking. While the motor is running, back electromotive force is generated with its magnitude lower than the DC-link voltage. To make the motor current can flow into the battery in regenerative braking mode, a bidirectional converter with boosting function capability is required. Standard three-phase converter can be controlled to respond such requirements. In this paper, a simple control strategy for a BLDC converter to operate under regenerative braking is proposed. It is capable to be operated in lower speed due to its boosting chopping concept. To verify the analysis, simulations and experimental works were done. They show the effectiveness of the proposed control strategy.