Harmonic Analysis of Pulse Width Modulation Techniques for Permanent Magnet Synchronous Motor Drives

Noise, vibration, and electro-magnetic compatibility of the motor drive in various motion control applications, are affected by the pulse width modulation (PWM) techniques. Various combinations of modulating signal, and the frequency and slope of carrier signal introduce varying low frequency and high frequency harmonics in the current and eventually in torque. This paper investigates the effects of fixed slope and randomness in slope and, fixed frequency and randomness in frequency of the carrier signal on the current and torque ripple for continuous space vector PWM (CSVPWM) and minimum discontinuous PWM (DPWM-MIN) along with simulation and experimental results. This analysis aids in the determination of the combination of slope and frequency of the carrier signal and choice of modulation signals for motion control application.