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On the Optimal Pole Width for Direct Drive Linear Wave Power Generators Using Ferrite Magnets

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  • Anders Hagnestål

    (Department of Electric Power and Energy Systems, School of Electrical Engineering and Computer Science, KTH Royal Institute of Technology, Teknikringen 33, 100 44 Stockholm, Sweden)

Abstract

In this work, ferrite magnet linear generators for wave power applications are considered. These machines operate at unusually low speeds, around and even below 1 m/s, at which the optimal geometry differs from standard machines, since the copper loss and the force density become considerably more important. The focus is on translator design, and analytical two-dimensional (2D) expressions for the optimal 2D geometry are derived. Finite Element Analysis (FEA) is also applied to verify the analytical expressions and to determine effects from leakage fluxes and iron saturation. Demagnetization of ferrite magnets is also discussed and calculations are made to show the demagnetization situation for the magnets in different geometries. Finally, an example generator design is made to illustrate the findings. This generator is compared to three other generator concepts. It is concluded that ferrite magnet generators can have at least nearly the same shear stress as surface mounted neodymium magnet generators at low speed if the airgap is 3 mm or less, provided that a proper pole length is chosen, and that they can be economically competitive to neodymium magnet generators for wave power. It is also concluded that the demagnetization situation for the magnets can be severe, and that the choice of magnet grade and pole length is crucial in this respect.

Suggested Citation

  • Anders Hagnestål, 2018. "On the Optimal Pole Width for Direct Drive Linear Wave Power Generators Using Ferrite Magnets," Energies, MDPI, vol. 11(6), pages 1-24, May.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1356-:d:149086
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    References listed on IDEAS

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    1. Gunn, Kester & Stock-Williams, Clym, 2012. "Quantifying the global wave power resource," Renewable Energy, Elsevier, vol. 44(C), pages 296-304.
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