New Direct Torque Control of Brushless DC Motor

This paper analyzes the Direct Torque Control (DTC) theory. We find that dynamical and stable performance are not hold with traditional voltage switch strategy at the same time. It presents a new direct torque control method of brushless DC motor, and introduces a space voltage vector selection table. By the addition of zero vector in the converter control, traditional three order torque control loop translates to five order torque control loop. So torque output have good dynamical and stable response, and stable torque ripple of traditional DTC can be improved. The direct torque control for brushless DC motor is implemented with TI DSP TMS320LF2407A. The experiment results show that the system has very quick dynamic response, low torque ripple and high performance requirements of industrial applications.