Multifunctional Six-Phase Motor Drives with Algorithms of Synchronized PWM

Novel methodology of synchronized pulsewidth modulation (PWM) has been disseminated for control of six-phase (dual-three phase) induction machine drives fed by two three-phase inverters with both single and separate DC voltage sources. Control algorithms are based in this case on the 30deg-phase-shifting of control and output signals of two standard voltage source inverters. Four basic schemes of synchronized PWM, applied for control of six-phase drives, have been analyzed and compared. Simulations results are given for continuous, discontinuous and combined versions of synchronized PWM. The spectra of the phase voltage of the six-phase drives with algorithms of synchronized PWM do not contain even harmonics and sub-harmonics, which is especially important for the high power/current applications