A novel six-phase inverter system with sixty-step output voltages for high-power motor drives

A novel six-phase voltage-fed inverter system is proposed. The system consists of two main three-phase inverters, coupling reactors, and an additional single-phase inverter. The ripple voltage injected into the DC link by the additional inverter results in 60-step load voltages with the help of the coupling reactors. The main inverters operate at the same frequency as the output and the additional inverter operates at a frequency six times higher. The advantages and disadvantages of the system are quantitatively discussed.