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Dynamics in large generators due to oval rotor and triangular stator shape

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Abstract

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. By numerical and analytical methods it is concluded for which generator parameters harmful conditions, such as complicated whirling motion and high amplitudes, will occur. 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.

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Authors and Affiliations

  1. Division of Solid Mechanics, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

    Niklas L. P. Lundström & Jan-Olov Aidanpää

Authors
  1. Niklas L. P. Lundström
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  2. Jan-Olov Aidanpää
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Correspondence to Niklas L. P. Lundström.

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Lundström, N.L.P., Aidanpää, JO. Dynamics in large generators due to oval rotor and triangular stator shape. Acta Mech Sin 27, 18–27 (2011). https://doi.org/10.1007/s10409-011-0410-7

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  • DOI: https://doi.org/10.1007/s10409-011-0410-7

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