Analysis of an Axial Field Hybrid Excitation Synchronous Generator

Junyue Yu (), Shushu Zhu and Chuang Liu
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Junyue Yu: School of Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Shushu Zhu: School of Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
Chuang Liu: School of Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Energies, 2024, vol. 17, issue 24, 1-17

Abstract: An axial field hybrid excitation synchronous generator (AF-HESG) is proposed for an independent power supply system, and its electromagnetic performance is studied in this paper. The distinguishing feature of the proposed generator is the addition of static magnetic bridges at both ends to place the field windings and the use of a sloping surface to increase the additional air-gap cross-sectional area. The advantage of the structure is that it achieves brushless excitation and improves the flux-regulation range. The structure and magnetic circuit characteristics are introduced in detail. Theoretical analysis of the flux-regulation principle is conducted by studying the relationship between field magnetomotive force, rotor reluctance, and air-gap flux density. Quantitative calculation is performed using a magnetomotive force (MMF)-specific permeance model, and the influence of the main parameters on the air-gap flux density and flux-regulation range is analyzed. Subsequently, magnetic field, no-load, and load characteristics are investigated through three-dimensional finite element analysis. The loss distribution is analyzed, and the temperature of the generator under rated conditions is simulated. Finally, a 30 kW, 1500 r/min prototype is developed and tested. The test results show good flux-regulation capability and stable voltage output performance of the proposed generator.

Keywords: hybrid excitation; axial field; magnet equivalent circuit; magnetomotive force-specific permeance model; permanent magnet; synchronous generator; three-dimensional finite element analysis (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: 2024
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