Enhancement of torque density in wound field switched flux machines with partitioned stators using assisted ferrites

In this paper, ferrites are applied in a partitioned stator wound field switched flux (PS-WFSF) machine to increase the air-gap density, and hence, average electromagnetic torque overload capability. Introducing short-circuited inner PS-WFSF can open-circuit phase fundamental back-EMF at 60 W copper loss by 2.33% 3.77%, respectively. Moreover, proposed with exhibit better capability than conventional machines without ferrites, e.g., 7.36% increment be achieved when is 120 W. The mechanism analyzed verified using finite element (FE) analysis. demagnetization of under rated on-load conditions investigated. Both prototypes one ferrite built tested validate analytical FE analyses.