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Synchronized PWM control of symmetrical six-phase drives

In order to avoid asynchronism of standard schemes of space-vector modulation, new method of synchronized pulsewidth modulation (PWM) has been applied for scalar control of symmetrical six-phase (dual three-phase) induction motor drives fed by two three-phase inverters. Basic schemes of synchronized continuous and discontinuous PWM, and also its combinations, disseminated for control of symmetrical dual three-phase systems, have been analyzed. Simulations give the behavior of symmetrical dual three-phase system with low switching frequency, controlled by algorithms of synchronized PWM. The spectra of the phase voltage of six-phase drives with synchronized pulsewidth modulation do not contain even harmonics and sub-harmonics during the whole control range, which is especially important for the high power/high current applications.