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2023•Unpublished venueRequires access

Additional Magneto Motive Force of Spoke-Type Vernier Permanent-Magnet Machines

Yang Liu, Bao Yun Song, Xiaoqi Tang

Open publisher page 1 citations

Abstract

Traditional permanent magnet (PM) magneto motive force (MMF) / specific permeance model has been widely applied to analytically predict the magnetic field of vernier permanent-magnet machines (VPMs). However, it fails to accurately predict the performances of spoke-type VPMs. This paper clarifies the intrinsic reason, i.e. the spoke-type VPMs have a large additional PM MMF introduced by the stator slotting, while the traditional model neglects it. In this paper, the additional PM MMF is analytically calculated and its influence on performance is comprehensively investigated. It shows that the additional PM MMF leads to reductions in the airgap flux density, back-EMF and torque density of spoke-type VPMs. Finally, a spoke-type VPM prototype is built and tested to verify the theoretical analysis.

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What this paper is about

Traditional permanent magnet (PM) magneto motive force (MMF) / specific permeance model has been widely applied to analytically predict the magnetic field of vernier permanent-magnet machines (VPMs). However, it fails to accurately predict the performances of spoke-type VPMs. This paper clarifies the intrinsic reason, i.e. the spoke-type VPMs have a large additional PM MMF introduced by the stator slotting, while the traditional model neglects it. In this paper, the additional PM MMF is analytically calculated and its influence on performance is comprehensively investigated. It shows that the additional PM MMF leads to reductions in the airgap flux density, back-EMF and torque density of spoke-type VPMs. Finally, a spoke-type VPM prototype is built and tested to verify the theoretical analysis.

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Available abstract

Traditional permanent magnet (PM) magneto motive force (MMF) / specific permeance model has been widely applied to analytically predict the magnetic field of vernier permanent-magnet machines (VPMs). However, it fails to accurately predict the performances of spoke-type VPMs. This paper clarifies the intrinsic reason, i.e. the spoke-type VPMs have a large additional PM MMF introduced by the stator slotting, while the traditional model neglects it. In this paper, the additional PM MMF is analytically calculated and its influence on performance is comprehensively investigated. It shows that the additional PM MMF leads to reductions in the airgap flux density, back-EMF and torque density of spoke-type VPMs. Finally, a spoke-type VPM prototype is built and tested to verify the theoretical analysis.

Key concepts: Vernier scale, Permeance, Magnet, Stator, Torque, Torque density, Type (biology), Magnetomotive force

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Additional Magneto Motive Force of Spoke-Type Vernier Permanent-Magnet Machines — Research Paper | ScholarLens