Regenerative brake of brushless DC motor for light electric vehicle

This paper proposes a new and simple while cost-effective method for light electric vehicles regenerative brake with BLDC motor (Brushless DC Motor). The power stage topology of this electric vehicles´ motor controller is similar to traditional BLDC motor controller. There is not necessary to use additional power converter, such as a boost converter, or other electric energy storage system for regenerative braking. During the regenerative braking, only PWM schemes of the inverter are changed, the kinetic energy of the vehicles will be converted to electrical energy and then returns to the battery pack. In order to achieve both better rider´s comfort and improved regenerative energy returns to battery pack, this paper proposes a novel regenerative current sensing and control method. On the regenerative braking period, the controller performs two control loops, the winding current control loop and output DC-Link current control loop. To implement the regenerative DC-Link current control loop, there is no need to mount additional sensor to measure the output current sensor. Finally, some experiment on a BLDC controller with new control strategy, described above, is demonstrated.