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Relation between generator geometry and resistance in armature winding
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Division for Electricity and Lightning Research.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Division for Electricity and Lightning Research.
2006 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 83, no 8, 884-892 p.Article in journal (Refereed) Published
Abstract [en]

Resistive losses constitute a big part of the total loss in a generator, especially in low speed generators where frequency-dependent losses are low. The resistive losses in the winding are proportional to the length of the winding. In this paper, a computer-based program for generator design, using a two-dimensional finite-element method, is used to verify a theoretically-derived result, that the length of the armature winding is minimal for a specific generator geometry. A shorter armature winding might imply only a negligible improvement of the overall efficiency. The result of the computer-based design program is compared with the theoretically-derived results. A rough estimation of the relation between the length of the armature winding and the overall efficiency is included in the paper, as well as data from two existing generators.

Place, publisher, year, edition, pages
2006. Vol. 83, no 8, 884-892 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-93574DOI: 10.1016/j.apenergy.2005.09.003OAI: oai:DiVA.org:uu-93574DiVA: diva2:167097
Available from: 2005-10-19 Created: 2005-10-19 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Direct Drive Generator for Renewable Power Conversion from Water Currents
Open this publication in new window or tab >>Direct Drive Generator for Renewable Power Conversion from Water Currents
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis permanent magnet direct drive generator for power conversion from water currents is studied. Water currents as a power source involves a number of constrains as well as possibilities, especially when direct drive and permanent magnets are considered. The high power fluxes and low current velocities of a water current, in combination with its natural variations, will affect the way the generator is operated and, flowingly, the appearance of the generator. The work in this thesis can, thus, be categorized into two general topics, generator technology and optimization. Under the first topic, fundamental generator technology is used to increase the efficiency of a water current generator. Under the latter topic, water current generators are optimized to a specific environment. The conclusion drawn from this work is that it is possible to design very low speed direct drive generators with good electromagnetic properties and wide efficiency peak.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 44 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 100
Keyword
Engineering physics, Teknisk fysik
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:uu:diva-6010 (URN)91-554-6362-2 (ISBN)
Public defence
2005-11-04, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00
Opponent
Supervisors
Available from: 2005-10-19 Created: 2005-10-19 Last updated: 2013-07-31Bibliographically approved

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Leijon, Mats

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