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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...
The purpose of this paper is to investigate both the torque ripple reduction technique and influences of mechanical tolerance on the performances of a novel dual-stator 6/4 flux-switching permanent magnet machine. To minimize the torque ripple, step skew designs are studied to determine the optimal step number and step skew span angle. In addition, three common rotor mechanical tolerance deviation...
This paper proposes several novel 6-slot/4-pole axial flux-switching machine topologies for electric and hybrid electric vehicles. The proposed topologies include stator shifting, rotor shifting, and a combination of shifting both the stator and the rotor. The proposed topologies eliminate the even harmonics of the flux linkage that create unbalanced flux linkage in the traditional 6-slot/4-pole machine...
This paper presents the study on a novel dual-stator 6/4 flux-switching permanent magnet (FSPM) machine for high-speed applications. Three different alternative topologies of dual-stator 6/4 FSPM machines are proposed and their performances regarding flux linkage, back electromotive force (back-EMF), torque density, and manufacturability are compared to the same specification of 10 kW and 15,000 rpm...
This paper presents an analytical method to realize even order harmonic elimination in flux-switching permanent magnet machines. The proposed method enables the calculation of total offset angle of flux linkages, taking into account an offset angle of stator slot and rotor poles. The 6-slot, 12-slot, and dual structure flux-switching permanent magnet machines are analyzed using the proposed method...
This research attempts to compare the effects of the slot opening on axial flux permanent magnet machines with the fractional slot concentrated winding and the integer slot toroid winding. Analytical derivations of winding function, flux linkage, and back-EMF are presented, paying special attention to the slot opening. Specific machines having 24 slots 28 poles, 24 slots 20 poles, and 84 slots 28...
This paper proposes a novel 6 slot-4 pole axial flux switching permanent magnet machine using dual-rotor single-stator. The analytical method is used to find offset angle to eliminate even harmonics of flux linkage and back-EMF of a conventional 6 slot-4 pole topology. The analytical method is verified with finite element analysis. Proposed novel topology is also compared with a conventional dual-rotor...
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