Direct power control of brushless DC motor drive

Due to significant increase in the demand of electric motors, design and manufacturing of high efficiency motors and related variable speed drives has been a major interest by many suppliers. Brushless DC (BLDC) motor has many advantages including high torque capability. In this paper, the possibilities of direct power control (DPC) of BLDC motors fed by voltage source inverter have been studied. BLDC motor has been driven with three control methods. It is shown that DPC method enjoys all advantages of direct torque control method including fast response and ease of implementation, without its lacks. Theoretical analysis and performance of the developed controller is confirmed via simulation under various conditions.