Design and Analysis of Dual-Rotor Modular-Stator Hybrid-Excited Axial-Flux Permanent Magnet Vernier Machine

Lun Jia, Mingyao Lin, Keman Lin, Wei Le and Anchen Yang
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Lun Jia: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Mingyao Lin: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Keman Lin: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Wei Le: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Anchen Yang: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2022, vol. 15, issue 4, 1-13

Abstract: This paper proposes a new structure of the dual-rotor hybrid-excited axial-flux permanent magnet vernier machine (DR-HEAFPMVM) with the modular stator and the consequent-pole PM (CPM) rotor for low-speed, high torque density applications such as in-wheel electric vehicles. The tooth-wound non-overlapping armature windings and direct current (DC) excitation windings are, respectively, arranged in stator main-teeth and split-teeth to obtain the modulated and adjustable air-gap flux densities, resulting in high torque density and outstanding flux-weakening capability. First, the design considerations, operation principles, and air-gap flux density distributions of the proposed machine are elaborated based on the air-gap permeance function. Then, the influence of the pole ratios (PRs) and the DC excitation currents on the main electromagnetic performances of the DR-HEAFPMVM, such as the flux-weakening capability and back-electromotive force (back-EMF), on-load electromagnetic torque, loss distribution, and efficiencies, is investigated using the 3-D finite-element method (FEM). Results verify the feasibility of the flux adjustment of the DC excitation windings equipped in the split-tooth, and the design with a pole ratio of 8/1 tends to have higher torque density, higher machine efficiency, and considerable flux-weakening capability compared with the other two PRs.

Keywords: dual-rotor; modular-stator; hybrid-excited; axial-flux permanent magnet vernier machine; 3-D finite-element method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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