Open-end six-phase machine drive system with six three-leg converters

This paper proposes a multilevel open-end six-phase motor drive. The system is composed of six isolated three-leg inverters and is adequate for high-power systems with voltage rating restrictions. The system model and a simple space vector pulse-width modulation (PWM) based on three similar individual planes are presented. Specific voltage vector application sequences that reduce the stator voltages harmonic distortions are provided. Three different dc-link voltages combinations are analyzed and simulated. Conventional and proposed configurations are compared in terms of harmonic distortion and semiconductor losses. Simulation and experimental results demonstrate the theoretical considerations.