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Cogging Force Reduction and Profile Smoothening Methods for a Slot-Spaced Permanent Magnet Linear Alternator

Author

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  • Chin-Hsiang Cheng

    (Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan City 70101, Taiwan)

  • Surender Dhanasekaran

    (International Doctoral Degree Program on Energy Engineering, National Cheng Kung University, Tainan City 70101, Taiwan)

Abstract

A Permanent Magnet Linear Alternator (PMLA) works seamlessly with a Free Piston Stirling Engine (FPSE) to convert short-stroke and high-frequency linear motion to electric power. Cogging force is an unavoidable opposition force acting on the translator, limiting the linear motion from the driving force, which shortens the lifespan of the machine, causing oscillatory power output and increased maintenance costs. This research focuses on the methods to reduce the cogging force acting on the translator of a slot-spaced PMLA by making geometrical changes to the structure of the machine. The profile of the cogging force is made to be in line with the displacement profile of the translator to avoid unnecessary vibrations and damaging the piston of the FPSE. The changes made also influence the induced voltage. Bringing a balance between reduced voltage and cogging force with minor geometrical changes and a sinusoidal cogging force profile is the outcome of this work.

Suggested Citation

  • Chin-Hsiang Cheng & Surender Dhanasekaran, 2023. "Cogging Force Reduction and Profile Smoothening Methods for a Slot-Spaced Permanent Magnet Linear Alternator," Energies, MDPI, vol. 16(15), pages 1-24, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:15:p:5827-:d:1211497
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    References listed on IDEAS

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    1. Chin-Hsiang Cheng & Surender Dhanasekaran, 2021. "Numerical Analysis and Parametric Study of a 7 kW Tubular Permanent Magnet Linear Alternator," Sustainability, MDPI, vol. 13(13), pages 1-15, June.
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    5. Shulei Zhang & Liming Zhou & Lu Zhang & Yuting Yang & Zhongwang Wei & Sha Zhou & Dawen Yang & Xiaofan Yang & Xiuchen Wu & Yongqiang Zhang & Xiaoyan Li & Yongjiu Dai, 2022. "Reconciling disagreement on global river flood changes in a warming climate," Nature Climate Change, Nature, vol. 12(12), pages 1160-1167, December.
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