Six-phase machine drive system based on three three-leg converters

In this paper, a six-phase machine drive system fed by a nine-leg converter is proposed. The drive system is composed of a three three-leg inverters feeding a six-phase induction motor, which is adequate to develop a high power system with voltage rating restrictions. The studied system is compared to the conventional solution and it is demonstrated that the nine-leg converter permits to reduce the harmonic distortion of the machine currents and to decrease the power processed by converter switches. The system model and the PWM strategy are presented. Experimental results demonstrate the feasibility of the proposed system.