Design of an integrated electrical drive using wound field flux switching motor coupled with Z-source inverter

This paper presents design studies of an integrated electrical drive employing a wound field flux switching motor (WFFSM) coupled with a Z-source inverter (ZSI). The WFFSM has field excitation coils as dc field mmf sources locate at the stator body. On the other hand, the ZSI works as a three-phase inverter with voltage boost function by adding a switching device and an impedance-network. The impedance-network consists of two dc reactors and two capacitors. In the proposed integrated drive system, the field excitation coils of WFFSM work not only as the dc field mmf sources, but also as the dc reactors in the ZSI. Therefore, with just addition of one switching device and the two capacitors, the proposed integrated drive system makes it possible to eliminate the dc chopper for field coil excitation while keeping the voltage boost function of ZSI and regenerative braking function of WFFSM. The design procedure of the proposed system as the integrated drive is examined and some design results using 2D-FEA and analytical expressions of ZSI are demonstrated.