Presentation of Novel High Torque Density Dual-Stator Wound-Field Flux Modulation Machines

An attempt is made in this paper to present some novel wound-field flux modulating machines (WF-FMMs) based on the double stator (DS) design topology. The idea is to utilise the large split ratios eminent in WF-FFMs to boost the torque density and provide potential as alternative non-PM machines for direct-drive systems. The study involves the electromagnetic finite element analysis of four different DS WF-FFMs conceived by combining the outer and inner stator design of the wound-field flux switching machine and DC-excited Vernier reluctance machine. In the end, the objective of obtaining distinct DS machines with propensity for high torque density, low torque ripple and high efficiency is achieved, with a promise of future works in terms of machine optimisation and experimentation.