In the inverter-fed ac drives the space vector modulation technique is the most popular
and wide spread one since it produces a high quality inverter-fed ac drive especially
for low and middle amplitudes of motor voltages. For realization of the space vector
PWM usually two different PWM methods can be applied. This paper deals with the analysis
and comparison of voltage spectra of these methods and the derivation of the analytical
equations of motor voltage harmonics for these PWM methods. It is shown that for the
infinite value of the sampling frequency all realization methods produce the same
voltage spectrum which is characterized by the relatively simple equation. This expression
also ensures an accurate computation of voltage, current and torque harmonics for
the relatively low value of the sampling frequency.
