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Rotor dynamic analysis of an eccentric hydropower generator with damper winding for reactive load
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Uppsala University.
Uppsala University.
2007 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 74, no 6, 1178-1186 p.Article in journal (Refereed) Published
Abstract [en]

Asymmetry in the magnetic circuit, around the air gap circumference, in a hydroelectric generator will give rise to a unbalanced magnetic pull. In this paper, a hydropower rotor system is modeled and the influence of electro-mechanical forces due to overexcitation is analyzed. The active power has been kept constant and the rotor excitation has been changed in order to vary the output of reactive power. The electromagnetic field is solved with the finite element method. Two electromagnetic models are compared: one with and one without damper winding. The mechanical model of the generator consists of a four degrees of freedom rigid disk connected to an elastic shaft supported by two bearings with linear properties. It has been found that the unbalanced magnetic pull slightly increases for reactive loads resulting in a decrease of natural frequencies and an increase of unbalance response. When the damper winding is included, the magnetic pull will decrease compared to the model without damper winding, and the pull force has two components: one radial and one tangential. The tangential component can influence the stability of the mechanical system for a range of design parameters.

Place, publisher, year, edition, pages
2007. Vol. 74, no 6, 1178-1186 p.
Research subject
Computer Aided Design; Solid Mechanics
URN: urn:nbn:se:ltu:diva-13318DOI: 10.1115/1.2723822Local ID: c872da50-9982-11db-8975-000ea68e967bOAI: diva2:986271

Validerad; 2007; 20061121 (karmar)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2016-10-19Bibliographically approved

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Karlsson, MartinAidanpää, Jan-Olov
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