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An Overview of MnAl Permanent Magnets with a Study on Their Potential in Electrical Machines

Author

Listed:
  • Sofia Kontos

    (Division of Solid State Physics, Uppsala University, 752 36 Uppsala, Sweden)

  • Anar Ibrayeva

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, 752 36 Uppsala, Sweden)

  • Jennifer Leijon

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, 752 36 Uppsala, Sweden)

  • Gustav Mörée

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, 752 36 Uppsala, Sweden)

  • Anna E. Frost

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, 752 36 Uppsala, Sweden)

  • Linus Schönström

    (Division of Physics and Astronomy, Uppsala University, 752 36 Uppsala, Sweden)

  • Klas Gunnarsson

    (Division of Solid State Physics, Uppsala University, 752 36 Uppsala, Sweden)

  • Peter Svedlindh

    (Division of Solid State Physics, Uppsala University, 752 36 Uppsala, Sweden)

  • Mats Leijon

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, 752 36 Uppsala, Sweden
    Division of Electrical Machines and Power Electronics, Chalmers University of Technology, 412 96 Göteborg, Sweden)

  • Sandra Eriksson

    (Division of Electricity, Department of Engineering Sciences, Uppsala University, 752 36 Uppsala, Sweden)

Abstract

In this paper, hard magnetic materials for future use in electrical machines are discussed. Commercialized permanent magnets used today are presented and new magnets are reviewed shortly. Specifically, the magnetic MnAl compound is investigated as a potential material for future generator designs. Experimental results of synthesized MnAl, carbon-doped MnAl and calculated values for MnAl are compared regarding their energy products. The results show that the experimental energy products are far from the theoretically calculated values with ideal conditions due to microstructure-related reasons. The performance of MnAl in a future permanent magnet (PM) generator is investigated with COMSOL, assuming ideal conditions. Simplifications, such as using an ideal hysteresis loop based on measured and calculated saturation magnetization values were done for the COMSOL simulation. The results are compared to those for a ferrite magnet and an NdFeB magnet. For an ideal MnAl hysteresis loop, it would be possible to replace ferrite with MnAl, with a reduced weight compared to ferrite. In conclusion, future work for simulations with assumptions and results closer to reality is suggested.

Suggested Citation

  • Sofia Kontos & Anar Ibrayeva & Jennifer Leijon & Gustav Mörée & Anna E. Frost & Linus Schönström & Klas Gunnarsson & Peter Svedlindh & Mats Leijon & Sandra Eriksson, 2020. "An Overview of MnAl Permanent Magnets with a Study on Their Potential in Electrical Machines," Energies, MDPI, vol. 13(21), pages 1-14, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:21:p:5549-:d:433484
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    References listed on IDEAS

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