Pulse Width Modulation (PWM) technique is a
common and popular speed control technique where
the power delivered to the load is determined by the
duty ratio of pulsating output waveform and is
controlled by another waveform. The ON and OFF
periods are rapid so the average power delivered to
output is low compared to other methods. Different
PWM techniques for three phase voltage source
inverter are Sinusoidal PWM, Third Harmonic
Injection PWM and Space Vector PWM. We are
conducting a comparative study of the above three
PWM techniques in MATLAB/SIMULINK
environment to find the best speed control method for
brushless dc motor.