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Dynamics in large generators due to oval rotorand triangular stator shape
Division of Solid Mechanics, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology.
Division of Solid Mechanics, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology.
2011 (English)In: Acta Mechanica Sinica, ISSN 0567-7718, E-ISSN 0459-1879, Vol. 27, no 1, 18-27 p.Article in journal (Refereed) Published
Abstract [en]

Earlier measurements in large synchronous generatorsindicate the existence of complex whirling motion,and also deviations of shape in both the rotor and the stator.These non-symmetric geometries produce an attraction forcebetween the rotor and the stator, called unbalanced magneticpull (UMP). The target of this paper is to analyse responsesdue to certain deviations of shape in the rotor and the stator.In particular, the perturbation on the rotor is consideredto be of oval character, and the perturbations of the statorare considered triangular. By numerical and analytical methodsit is concluded for which generator parameters harmfulconditions, such as complicated whirling motion and highamplitudes, will occur. During maintenance of hydro powergenerators the shapes of the rotor and stator are frequentlymeasured. The results from this paper can be used to evaluatesuch measurements and to explain the existence of complexwhirling motion.

Place, publisher, year, edition, pages
Beijing: Science Press , 2011. Vol. 27, no 1, 18-27 p.
Keyword [en]
Generator, Rotor, Dynamics, Asymmetric, Hydropower
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-40229DOI: 10.1007/s10409-011-0410-7OAI: oai:DiVA.org:umu-40229DiVA: diva2:398460
Available from: 2011-02-17 Created: 2011-02-17 Last updated: 2017-12-11Bibliographically approved

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Lundström, Niklas L.P.

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