A novel single-phase flux-switching permanent magnet linear generator used for free-piston Stirling engine

This paper investigates a novel single-phase flux-switching permanent-magnet (PM) linear machine used for free-piston Stirling engines. The machine topology and operating principle are studied. A flux-switching PM linear machine is designed based on the quasi-sinusoidal speed characteristic of the r...

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Bibliographic Details
Published in:Journal of applied physics 2014-05, Vol.115 (17)
Main Authors: Zheng, Ping, Sui, Yi, Tong, Chengde, Bai, Jingang, Yu, Bin, Lin, Fei
Format: Article
Language:English
Subjects:
Air gaps
Back electromotive force
Finite element method
Flux
Magnetism
Permanent magnets
Stators
Stirling engines
Switching
Teeth
Topology
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Summary:This paper investigates a novel single-phase flux-switching permanent-magnet (PM) linear machine used for free-piston Stirling engines. The machine topology and operating principle are studied. A flux-switching PM linear machine is designed based on the quasi-sinusoidal speed characteristic of the resonant piston. Considering the performance of back electromotive force and thrust capability, some leading structural parameters, including the air gap length, the PM thickness, the ratio of the outer radius of mover to that of stator, the mover tooth width, the stator tooth width, etc., are optimized by finite element analysis. Compared with conventional three-phase moving-magnet linear machine, the proposed single-phase flux-switching topology shows advantages in less PM use, lighter mover, and higher volume power density.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4862397