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Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

Author

Listed:
  • Jennifer Leijon

    (Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Jonathan Sjölund

    (Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Boel Ekergård

    (Seabased Industry AB, Verkstadsgatan 4, 453 30 Lysekil, Sweden)

  • Cecilia Boström

    (Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Sandra Eriksson

    (Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Irina Temiz

    (Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden)

  • Mats Leijon

    (Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden
    Department of Electrical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden)

Abstract

The wave energy converter (WEC) studied and developed at Uppsala University in Sweden is a point absorbing buoy connected to a linear generator (LG) on the seabed. Previous studies have improved the sustainability of the generator, changing its magnets from Nd 2 Fe 14 B-magnets to ferrites. In this paper, the magnetic circuit of the linear generator is further studied. Ferrite magnets of two different types (Y30 and Y40) are studied along with different shapes of pole shoes for the system. The finite element method (FEM) simulations in a program called Ace are performed. The results show that a linear generator including both Y30 and Y40 magnets and shortened T-shaped pole shoes can generate a similar magnetic energy in the airgap as a linear generator only containing Y40 magnets and rectangular pole shoes. This shows that the magnetic circuit can be altered, opening up sizes and strengths of magnets for different retailers, and thereby possibly lowering magnet cost and transportation. This work was previously presented as a conference at the European Wave and Tidal Energy Conference (EWTEC) 2017 in Cork, Ireland; this manuscript has been carefully revised and some discussions, on magnet costs for example, have been added to this paper.

Suggested Citation

  • Jennifer Leijon & Jonathan Sjölund & Boel Ekergård & Cecilia Boström & Sandra Eriksson & Irina Temiz & Mats Leijon, 2017. "Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power," Energies, MDPI, vol. 11(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:11:y:2017:i:1:p:84-:d:124933
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    References listed on IDEAS

    as
    1. Lejerskog, Erik & Boström, Cecilia & Hai, Ling & Waters, Rafael & Leijon, Mats, 2015. "Experimental results on power absorption from a wave energy converter at the Lysekil wave energy research site," Renewable Energy, Elsevier, vol. 77(C), pages 9-14.
    2. Falnes, Johannes & Lovseth, Jorgen, 1991. "Ocean wave energy," Energy Policy, Elsevier, vol. 19(8), pages 768-775, October.
    3. Malin Göteman & Jens Engström & Mikael Eriksson & Jan Isberg, 2015. "Fast Modeling of Large Wave Energy Farms Using Interaction Distance Cut-Off," Energies, MDPI, vol. 8(12), pages 1-17, December.
    4. Kalle Haikonen & Jan Sundberg & Mats Leijon, 2013. "Characteristics of the Operational Noise from Full Scale Wave Energy Converters in the Lysekil Project: Estimation of Potential Environmental Impacts," Energies, MDPI, vol. 6(5), pages 1-21, May.
    5. Leijon, M. & Danielsson, O. & Eriksson, M. & Thorburn, K. & Bernhoff, H. & Isberg, J. & Sundberg, J. & Ivanova, I. & Sjöstedt, E. & Ågren, O. & Karlsson, K.E. & Wolfbrandt, A., 2006. "An electrical approach to wave energy conversion," Renewable Energy, Elsevier, vol. 31(9), pages 1309-1319.
    6. Vincenzo Franzitta & Domenico Curto, 2017. "Sustainability of the Renewable Energy Extraction Close to the Mediterranean Islands," Energies, MDPI, vol. 10(3), pages 1-19, February.
    7. Langhamer, Olivia & Haikonen, Kalle & Sundberg, Jan, 2010. "Wave power--Sustainable energy or environmentally costly? A review with special emphasis on linear wave energy converters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(4), pages 1329-1335, May.
    8. Valeria Castellucci & Mikael Eriksson & Rafael Waters, 2016. "Impact of Tidal Level Variations on Wave Energy Absorption at Wave Hub," Energies, MDPI, vol. 9(10), pages 1-11, October.
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