Method and device for PWM control of a voltage source inverter

摘要

A method of controlling an AC motor (12), comprising: providing a voltage to the AC motor (12) by a modified discontinuous pulse width modulation (GDPWM) method, wherein a modulator (31) provides a suitable zero vector in Selects a maximum duty cycle (da, db, dc) of each of the plurality of phase legs by a duty cycle of the zero vector by varying the duty cycle of the zero vector at a distortion ratio versus sector transitions is added to each of the plurality of phase legs when a duty cycle of a first phase leg of the switching cycle is less than a minimum duty cycle (dmin), wherein the minimum duty cycle (dmin) indicates the distortion range.