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

Chin-Hsiang Cheng () and Surender Dhanasekaran
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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

Energies, 2023, vol. 16, issue 15, 1-24

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.

Keywords: cogging force; notching; permanent magnet linear alternator; PMLSM (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: 2023
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