AbstractA simulation procedure for the computation of current wave forms in a system composed by a three-phase in verter driving an induction motor is proposed.The amplitude of the fundamental harmonic of the AC voltage driving the motor is varied by means of a PWM technique: a triangular wave form carrier is modulated by a sinusoidal waveform.The induction motor is described by four differential equations referred to the d-q transformation, with the assumption that the speed does not change during the time interval corresponding to one period of the drive voltage.The input data required by the procedure, which is based on a discrete-time domain analysis,are the ratio between the carrier and the modulation signal frequencies, the speed and the motor parameter sj the outputs are the current wave forms in the motor windings, in the transist or sand in the diodes. The spectra of the resulting currents are also computed.