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Ideal Analytical Expression of the Magnetic Circuit in a Permanent Magnet Linear Machine
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2013 (English)In: Proceedings of the Ecological Vehicles and Renewable Energies (EVER), 2013, 2013, 1-6 p.Conference paper (Refereed)
Abstract [en]

The aim of this paper is to presents a study and derived expressions of the magnetic flux density in the air-gap of the linear synchronous permanent magnet generator, utilized in the wave energy converter. The significance of a well-modelled magnetic flux density-term is important, when, for example, modelling the induced voltage and dimension the support structure due to the magnetic force between the stator and translator at no load situation.

Place, publisher, year, edition, pages
2013. 1-6 p.
National Category
Energy Systems
Research subject
Engineering Science with specialization in Science of Electricity
URN: urn:nbn:se:uu:diva-207165DOI: 10.1109/EVER.2013.6521545ISI: 000325276700028ISBN: 978-1-4673-5269-7OAI: oai:DiVA.org:uu-207165DiVA: diva2:646974
Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies EVER’13, March 27-30, 2013, Monte-Carlo, Monaco
Available from: 2013-09-10 Created: 2013-09-10 Last updated: 2014-01-23Bibliographically approved
In thesis
1. Full Scale Applications of Permanent Magnet Electromagnetic Energy Converters: From Nd2Fe14B to Ferrite
Open this publication in new window or tab >>Full Scale Applications of Permanent Magnet Electromagnetic Energy Converters: From Nd2Fe14B to Ferrite
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents research regarding a full scale linear ferrite permanent magnet generator, installed in a wave energy conversion system. The ferrite based magnetic circuit, supplementing the previous utilized Nd2Fe14B-magnet design, is designed with an electromagnetic numerical simulation tool, where the model is derived from Maxwell’s equations. The full scale design is, known to the author, the first developed linear ferrite based machine. The material change in the magnetic circuit required different mechanical solutions of the generator. The fundamental, primary theory and reasoning behind the new mechanical design is here presented, where sustainability, economy and production have been in focus and affected the final design. Two versions of the generator have been assembled and deployed at the projects experimental site on the Swedish west coast, and three more are under construction, planned to be installed during the autumn of 2013.  

Further, the thesis presents an electric conversion circuit based on the electric resonance phenomena. Full scale experimental results present a successfully achieved electric resonance between the linear wave energy generator and external circuit.

Finally, research regarding a two pole permanent magnet motor for an electrical vehicle is presented. Detailed analytical and numerical calculations are utilized to investigate the losses in the machine over a wide frequency interval. The results indicate the possibility of an increased efficiency of electrical motors in electrical vehicle system and argue for elimination of the gearbox. The system total efficiency and mechanical stability can thereby be increased.   

The work concerning the wave energy converter is a part of a larger project, the Lysekil Wave Power Project, developed by a research group at Uppsala University, whereas the work concerning the electric motor so far has been carried out as an individual project. However, a future goal is to integrate the research on the electric motor for electric vehicles with ongoing research regarding a flywheel based electric driveline for an All Electric Propulsion System.      

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 75 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1074
National Category
Water Engineering
urn:nbn:se:uu:diva-207280 (URN)978-91-554-8752-2 (ISBN)
Public defence
2013-10-25, Polhemsalen, Ångströmslaboratoriet, Regementsvägen 1, Uppsala, 15:55 (English)
Available from: 2013-10-04 Created: 2013-09-11 Last updated: 2014-01-23

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