Regenerative braking of brushless dc motor

Abstract —This paper describes an optimal regenerative braking control scheme for a permanent magnet brushless DC motor to achieve goals of the electric brake with energy regeneration. During the braking period, the proposed method only changes the switching sequence of the inverter to control the inverse torque so that the braking energy will return to the battery. Compared with the presented methods, the proposed solution simultaneously achieves dual goals of the electric brake and the energy regeneration without using additional converter, ultra capacitor, or complex winding-changeover technique. Since the braking kinetic energy is converted into the electrical energy and then returns to the battery, the energy regeneration could increase the efficiency of BLDCM drive. Index Terms—Brushless dc motor (BLDCM), electric brake, energy regeneratio