Prediction of vibration levels and resonant frequencies in static electrical apparatus

Results of computer simulations obtained by a finite-element package, FLUXMECA, are presented and compared with experimental measurements of vibrations of static inductors. The objective is to reduce the vibrations' level and the acoustic noise of the transformers. Resonant frequencies and the mechanical behavior of the inductors are predicted with a mechanical finite-element model coupled with Maxwell's equations. A homogenization algorithm allows representation of a stratified structure by a homogenized one. Two kinds of inductors have been tested: cylindrical ones without iron cores and classical iron-cored inductors. A study of the electromagnetic forces and the mechanical structures is presented, clarifying the generation of noise and vibrations in static electrical apparatus.<
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