Dual Series-End Unit-Based Eight-Leg VSI for Dual Three-Phase Machine Drives

Dual three-phase machines (DTPMs) can be a competitive candidate for the propulsion system of electric vehicles due to their merits of high-power density, strong fault-tolerance capability, and more degrees of freedom. In this paper, a dual series-end unit-based eight-leg voltage source inverter (DSEL-VSI) for DTPM drive is investigated to further improve the performance of DTPM drive system. From the analysis of the winding connection sequence of the DTPM in DESL-VSI, the optimal winding connection sequences for linear modulation region extension and leg-current stress reduction are respectively developed. Besides, the PWM strategy to drive the DSEL-VSI for DTPM drive is also proposed with full DC-link voltage utilization. At last, the DSEL-VSI for DTPM drive and the corresponding PWM strategy are verified by several experimental tests.