Direct Torque Control of BLDC Motor Using Space Vector Modulation Technique

Abstract

Brushless DC Motors are used because of their higher efficiency, easy maintenance and high torque to inertia ratio. Several methods were proposed for better control of torque and current. Almost all the proposed techniques are complex and stator flux control is not considered in this technique due to this high-speed operations are not possible. The sensorless technique implemented is similar to Direct Torque control Technique for AC Motors This method controls torque directly and stator flux indirectly. The electric rotor position of the motor can be determined by using winding inductance, stator fluxes and currents of the stationary reference frame. Pulse Width Modulation Techniques are used to control the output voltage and frequency of the voltage source inverter.SV- PWM technique is preferred because it reduces switching losses, harmonic distortion, better utilization of available DC bus voltages.
In This Thesis Space Vector PWM Technique allows the regulation of varying signals than that of Pulse Width and vector control techniques. This Thesis provides the model for sensorless Direct Torque Control of BLDC motor drive with SV-PWM Technique using MATLAB/Simulink.