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E. Schmidt:
"Eddy Current Losses in the Stator Clamping System of Hydro Generators";
Bericht für Bericht für Projekte an den zentralen Applikationsservern des Zentralen Informatikdienstes der TU Wien; 2005; 9 S.

The magnetic field in the end region of synchronous generators causes eddy currents in the conductive parts of the stator clamping system. With large hydro generators, the specific losses in these regions can reach high values and can cause local thermal problems. For this reason, an accurate calculation of these eddy current losses is a matter of interest with all design phases of large hydro generators.

A fully 3D approach will be presented for the computation of eddy current losses in the stator clamping parts of a 450 MVA hydro generator. Both time-harmonic and nonlinear transient finite element analyses are carried out. Special attention is given to the influence of the third harmonic wave in the excitating magnetic field. With the indent of an inclusion with design review and design optimization, the results obtained from both analysis methods are compared regarding local and total eddy current losses.