A comparative analysis of two commutation circuits for adjustable current input inverters feeding induction motors

A hybrid mathematical/graphical technique for quick determination of instantaneous voltages on components in two types of adjustable current input (ACI) inverters feeding a standard induction motor is presented with practical examples. A comparison between the synthesized voltage waveforms of the two inverter types, auxiliary thyristor and autocommutated, reveals better overall performance for the auto-commutated inverter.