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

Jennifer Leijon, Jonathan Sjölund, Boel Ekergård, Cecilia Boström, Sandra Eriksson, Irina Temiz and Mats Leijon
Additional contact information
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

Energies, 2017, vol. 11, issue 1, 1-13

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.

Keywords: wave energy converter (WEC); linear generator (LG); ferrite permanent magnets (PMs); renewable energy sources (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
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