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First experimental results from sea trials of a novel wave energy system
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Division for Electricity and Lightning Research.
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In: Applied Physics LetterArticle in journal (Refereed) Submitted
URN: urn:nbn:se:uu:diva-94987OAI: oai:DiVA.org:uu-94987DiVA: diva2:169030
Available from: 2006-10-20 Created: 2006-10-20Bibliographically approved
In thesis
1. Wave Energy Conversion: Linear Synchronous Permanent Magnet Generator
Open this publication in new window or tab >>Wave Energy Conversion: Linear Synchronous Permanent Magnet Generator
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis studies the electric aspects of a linear synchronous permanent magnet generator. The generator is designed for use in a wave energy converter, which determines the fundamental requirements of the generator. The electromagnetic properties of the generator are investigated with a finite element based simulation tool. These simulations formed the base of the design and construction of a laboratory prototype. Several experiments where conducted on the prototype generator. The results verify at large the simulation tool. However, a difference between the measured and simulated air gap flux was discovered. This was attributed to the longitudinal ends of the generator, which are ignored in the simulation tool. Experiences from the construction, and further finite element studies, led to a significant change in the support structure of the first offshore prototype generator. A complete wave energy converter was constructed and launched, the 13th of March, on the west coast of Sweden. A study of the load resistance impact on the power absorption has been carried out. An optimal load interval, with regard to power absorption, has been identified. Furthermore, the generator has proofed to withstand short term overload several times larger than the nominal load. Finally, the longitudinal ends’ influence on the flux distribution was investigated with an analytical model, as well as finite element simulations. A possible problem with large induction of eddy currents in the actuator back steel was identified.

This work is a part of a larger project, which aims do develop a viable wave energy conversion system.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 102 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 232
Engineering physics, Finite element method, linear synchronous generator, longitudinal end effect, permanent magnet, point absorber, offshore testing, wave power, Teknisk fysik
urn:nbn:se:uu:diva-7194 (URN)91-554-6683-4 (ISBN)
Public defence
2006-11-10, Siegbahnsalen, Ångströmlaboratoriet, Box 534, Uppsala, 13:15
Available from: 2006-10-20 Created: 2006-10-20 Last updated: 2013-07-26Bibliographically approved

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