Abstract: This paper proposes a effective scheme for Direct Torque Control (DTC) of Brushless DC Motor. Unlike the traditional DTC where both the torque and flux must be employed in order to deliver the switching table for the inverter, the proposed DTC scheme utilizes the information of torque only. By considering particular operating principle of motor, the instantaneous torque can be estimated only by using back EMF ratio in a unified differential equation.

Keywords: Brushless DC Motor, Direct Torque Control, Electric Vehicle.