Control of wound field synchronous motor integrated with ZSI

This paper proposes a novel variable speed motor drive, wound field synchronous motor (WFSM) drive integrated with Z-source inverter (ZSI). The proposed WFSM is non-permanent magnet machine and employs two field coils as dc field mmf sources. On the other hand, ZSI has an impedance-network which is composed of two dc reactors and two capacitors. In the proposed drive, the two field coils of WFSM act not only as dc field mmf sources, but also as dc reactors in ZSI, resulting in size and cost reductions of the drive system. In order to achieve both the voltage boost-up and the field current controls simultaneously, its control algorithm is examined. Simulation and experimental results show that the proposed drive under the proposed control works properly.