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Complex dynamic responses due to deviations of generator shape
Division of Solid Mechanics, Luleå University of Technology, Luleå, SWEDEN.
Division of Solid Mechanics, Luleå University of Technology, Luleå, SWEDEN.
2009 (English)In: 10th CONFERENCE on Dynamical Systems: Theory and Applications, 2009Conference paper, Published paper (Refereed)
Abstract [en]

Earlier measurements in large synchronous generators indicate 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 force between the rotor and the stator, called Unbalanced Magnetic Pull (UMP). The target of this paper is to analyse responses due to certain deviations of shape in the rotor and the stator. In particular, the perturbation on the rotor is considered to be of oval character, and the perturbations of the stator are considered triangular and eccentric. It is concluded that harmful conditions can occur due to high amplitudes especially when the whirling of the rotor changes from forward to backward. During maintenance of hydro power generators the shapes of the rotor and stator are frequently measured. The results from this paper can be used to evaluate such measurements and to explain the existence of complex whirling motion.

Place, publisher, year, edition, pages
2009.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:umu:diva-40231OAI: oai:DiVA.org:umu-40231DiVA: diva2:398464
Conference
DSTA-2009, December 7-10Łódź, Poland
Available from: 2011-02-17 Created: 2011-02-17 Last updated: 2012-02-13Bibliographically approved

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http://www.dsta2009.p.lodz.pl/

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Lundström, Niklas L.P.
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