SVPWM-Based DTC Controller for Brushless DC Motor

摘要

Brushless DC motor is one of the growing electrical drives in present days, because of their higher efficiency, high power density, easy maintenance and control, and high torque to inertia ratio. In this paper, a sensorless space vector modulation-based direct torque and indirect flux control of BLDC has been investigated. There are several methods that are projected for BLDC to gain better torque and current control, i.e., with minimum torque and current pulsations. The proposed sensorless method is similar to the usual direct torque control method which is utilized for sinusoidal alternating current motors so that it controls toque directly and stator flux indirectly by varying direct axis current. And the electric rotor position can be found by using winding inductance and stationary reference frame stator fluxes and currents. In this paper, space vector modulation technique is utilized which permits the regulation of varying signals than that of PWM and vector control techniques. The validity of the projected sensorless three-phase conduction direct torque control of BLDC motor drive method is established in the Simulink, and the results are observed.