The modelling of the unbalanced magnetic pull (UMP) and the analysis of its effects on the dynamical behaviour of a large turbo-generator are presented in this paper. The UMP is the consequence of the electromagnetic forces acting upon rotor and stator generator surfaces and depends on the non-uniform air-gap distribution between rotor and stator. The flexibility and the dynamic effects on the generator behaviour are taken into account by an accurate calculation of the air-gap distribution depending on the position in a generic time instant of the rotor inside the stator. The method is then applied for the vibratory analysis of a two pole pair generator of a steam turbo-set: the harmonic spectrum of the UMP is evaluated and the presence of non-linear effects highlighted.

Volume Subject Area:
22nd Biennial Conference on Mechanical Vibration and Noise
Topics:
Generators, Poles (Building), Rotors, Stators, Electromagnetic force, Modeling, Steam, Turbochargers, Turbogenerators
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Copyright © 2009
 by ASME
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