The different sinusoidal (natural) sampling methods for bipolar and unipolar pulsewidth
modulation of one- and three-phase inverters are compared. The load voltage spectra,
the voltage, the flux and the current distortion factors are determined, and on this basis
it is shown that unipolar modulation produces a lower value of harmonic current losses
than bipolar modulation does, particularly, for one-phase inverters and high value of
fundamental voltage
