Small shape deviations causes complex dynamics in large electric generators

Abstract

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.

Published in

European Physical Journal: Applied Physics
2014, volume: 66, number: 2, article number: 20903
Publisher: EDP SCIENCES S A

SLU Authors

• Grafström, Anton

  • Department of Forest Resource Management, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Other Physics Topics

Publication identifier

• DOI: https://doi.org/10.1051/epjap/2014130447

Permanent link to this page (URI)

https://res.slu.se/id/publ/63680