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Design Study of 50 W Linear Generator for Radioisotope Stirling Converters Using Numerical Simulations

Author

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  • Muhammad Mohsin

    (Department of Mechanical Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea)

  • Dong-Jun Kim

    (Department of Mechanical Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea)

  • Kyuho Sim

    (Department of Mechanical Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea)

Abstract

Stirling engines are the engines that convert heat energy into mechanical work. This study models a 50 W linear generator designed for integration with a Stirling engine. To develop a model, the base design of the already developed 1 kW model was used, and its size was proportionally reduced to match the stroke of the Stirling engine. By reducing the length of the 1 kW model to a length scale factor (LSF) of 0.5, the stroke level of the engine was determined. However, the radius of the LSF 0.5 linear generator model was adjusted to match the engine. After finalizing the 50 W linear generator dimensions, the model was simulated using MAXWELL v14. software to compute output power and other electrical parameters. This study also analyzed the losses of the 50 W linear generator and its phasor diagram. Later, the output values generated using MAXWELL software were compared with the results obtained using SAGE v11. software for verification. The outcome of this study was a model that achieved an output power of 50 W with an efficiency of 90% and a generator size of 96 mm. Because of its versatility, low weight, and high efficiency, it can be used in a wide range of applications. Due to its small size, it can be utilized for empowering humanoid robots, radioisotope power, space exploration, etc.

Suggested Citation

  • Muhammad Mohsin & Dong-Jun Kim & Kyuho Sim, 2025. "Design Study of 50 W Linear Generator for Radioisotope Stirling Converters Using Numerical Simulations," Energies, MDPI, vol. 18(17), pages 1-30, September.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:17:p:4731-:d:1742836
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    References listed on IDEAS

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    1. Zhongjie Li & Limeng Zhou & Ying Gong & Fan Shen & Yan Peng & Hao Wu, 2025. "Axial Flux Electromagnetic Energy Harvester Driven by a Stirling Engine for Waste Heat Recovery," Energies, MDPI, vol. 18(7), pages 1-16, March.
    2. Hadžiselimović, Miralem & Srpčič, Gregor & Brinovar, Iztok & Praunseis, Zdravko & Seme, Sebastijan & Štumberger, Bojan, 2019. "A novel concept of linear oscillatory synchronous generator designed for a stirling engine," Energy, Elsevier, vol. 180(C), pages 19-27.
    3. Chi, Chunyun & Li, Ruijie & Mou, Jian & Lin, Mingqiang & Jiao, Kexin & Yang, Mingzhuo & Liu, He & Hong, Guotong, 2024. "Theoretical and experimental study of free piston Stirling generator for high cold end temperatures," Energy, Elsevier, vol. 289(C).
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