Research on Techniques of Three-level Six-phase Synchronous Motor Driver

Medium-voltage inverter is the most popular scheme for high-power motor driver.But it becomes more and more difficult to improve the power of motor driver further because of the limitation of the capability of power devices. Multi-phase motor driver is another method for high-power motor driver.In this paper the scheme integrated the medium-voltage inverter with multi-phase motor is researched. And some key techniques are studied in detail such as air gap flux-oriented vector control of six-phase SM,air-gap flux observation of six-phase SM,SVPWM of six-phase three-level inverter and its neutral-point control.Then a 690V/200kW three-level inverter of six-phase SM is developed,and experimental results verify the techniques presented in the paper.