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Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.ORCID iD: 0000-0001-8097-0223
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Seabased Ind AB, Verkstadsgatan 4, S-45330 Lysekil, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
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2018 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 11, no 1, article id 84Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 11, no 1, article id 84
Keywords [en]
wave energy converter (WEC), linear generator (LG), ferrite permanent magnets (PMs), renewable energy sources
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-348930DOI: 10.3390/en11010084ISI: 000424397600084OAI: oai:DiVA.org:uu-348930DiVA, id: diva2:1201543
Funder
Swedish Research Council, 2015-03126Swedish Energy Agency, P42243-1Available from: 2018-04-26 Created: 2018-04-26 Last updated: 2019-03-04Bibliographically approved
In thesis
1. Wave Powered Desalination
Open this publication in new window or tab >>Wave Powered Desalination
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this licentiate thesis is to investigate opportunities to produce fresh-water and electricity using marine renewable energy sources, such as wave power and marine current power, for water scarce areas. It summarizes the ongoing work within the field and suggests some possibilities of future re-search. Specifically, the desalination process reverse osmosis has been dis-cussed in combination with the wave energy concept designed at Uppsala Uni-versity for a site by the Kenyan coast. A review on wave powered desalination systems was presented, and the wave climate of the Kenyan coast was reana-lyzed and discussed with respect to the wave power and desalination applica-tion. Also, the magnetic circuit of the linear generator was investigated, as well as the control of the system, to enhance its sustainability. Moreover, the marine current energy converter designed at Uppsala University was investi-gated for desalination purposes. Only literature studies and simulations were performed, and the research would benefit from experimental work.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2018
Series
UURIE / Uppsala University, Department of Engineering Sciences, ISSN 0349-8352 ; 354-18L
Keywords
wave power, desalination, marine renewable energy sources, marine current, freshwater
National Category
Energy Engineering
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-369356 (URN)
Presentation
2018-11-15, 2005 Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2015-03126StandUp
Available from: 2018-12-12 Created: 2018-12-12 Last updated: 2019-03-04Bibliographically approved

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Leijon, JenniferSjölund, JonathanBoström, CeciliaEriksson, SandraTemiz, IrinaLeijon, Mats

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