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Comparison of dual structure axial flux-switching permanent magnet machines

This paper presents a new study on the comparison of dual-rotor single-stator (DRSS) and dual-stator single-rotor (DSSR) axial flux-switching permanent magnet (AxFSPM) machines. The DRSS and DSSR AxFSPM machines have the same dimensions except for stator and rotor yoke lengths. 3-D finite element analysis (FEA) and experimental verification are used for the comparison study. The comparison results show that the DRSS AxFSPM machine reduces leakage flux in both airgap and housing compare to the DSSR AxFSPM machine. For this reason, the DRSS AxFSPM machine achieves higher fundamental back-EMF and average torque than those of the DSSR AxFSPM machine. The DRSS AxFSPM machine also achieves higher efficiency than that of the DSSR AxFSPM machine because of lower housing loss and higher output power. The DRSS AxFSPM machine suffers severe pulsating z-axis force at rotor fixture.