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Energies 2018, 11(1), 84; doi:10.3390/en11010084

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

Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden
Seabased Industry AB, Verkstadsgatan 4, 453 30 Lysekil, Sweden
Department of Electrical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 23 December 2017 / Accepted: 26 December 2017 / Published: 31 December 2017
(This article belongs to the Special Issue Electric Machines and Drives for Renewable Energy Harvesting 2017)
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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 Nd2Fe14B-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. View Full-Text
Keywords: wave energy converter (WEC); linear generator (LG); ferrite permanent magnets (PMs); renewable energy sources wave energy converter (WEC); linear generator (LG); ferrite permanent magnets (PMs); renewable energy sources

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Leijon, J.; Sjölund, J.; Ekergård, B.; Boström, C.; Eriksson, S.; Temiz, I.; Leijon, M. Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power. Energies 2018, 11, 84.

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