A Novel Double Stator Flux Modulation Machine With Low-Temperature Superconducting Windings

Flux modulation permanent magnet machines (FMPMMs) exhibit many superiorities over regular permanent magnet machines (PMMs), such as simple and robust configuration, high torque density, and efficiency; thus they are promising candidates for the motors in wind turbine powertrains, electric vehicles, and ship propulsion systems. However, since the PM flux linkage is almost constant, the flux-weakening capability of FMPMMs is usually inferior to that of the wound field machines (WFMs). Moreover, the power factors of FMPMMs are also lower. In order to incorporate the merits of FMPMMs and WFMs, this paper proposes a double-stator flux modulation machine with low-temperature superconducting field windings, which can exhibit higher torque density, stronger flux weakening capability, and larger power factor than the conventional FMPMMs. The configurations and working mechanism of the proposed machine are introduced, and its key performances are comparatively analyzed to a regular FMPMM based on a finite-element algorithm.