Small shape deviations causes complex dynamics in large electric generators
2014 (English)In: European Physical Journal: Applied physics, ISSN 1286-0042, E-ISSN 1286-0050, Vol. 66, no 2, 20903- p.Article in journal (Refereed) Published
We prove that combinations of small eccentricity, ovality and/or triangularity in the rotor and stator can produce complex whirling motions of an unbalanced rotor in large synchronous generators. It is concluded which structures of shape deviations that are more harmful, in the sense of producing complex whirling motions, than others. For each such structure, we derive simplified equations of motions from which we conclude analytically the relation between shape deviations and mass unbalance that yield non-smooth whirling motions. Finally we discuss validity of our results in the sense of modeling of the unbalanced magnetic pull force.
Place, publisher, year, edition, pages
EDP Sciences, 2014. Vol. 66, no 2, 20903- p.
Mathematics Physical Sciences
IdentifiersURN: urn:nbn:se:umu:diva-91388DOI: 10.1051/epjap/2014130447ISI: 000338424300012OAI: oai:DiVA.org:umu-91388DiVA: diva2:736216