E. Schmidt, G. Traxler-Samek:
"Analytical Solution of the 3D Diffusion Equation for Eddy Currents in the Stator Clamping Plate of Synchronous Generators";
Talk: Progress in Electromagnetics Research Symposium (PIERS), Honolulu (HI, USA); 10-15-2003 - 10-19-2003; in: "Proceedings of the Progress in Electromagnetics Research Symposium (PIERS)", (2003), ISBN: 0-9679674-3-0; 342.

The stator core laminations of large hydro-generators are compressed with the stator clamping plates, the clamping bolts and the clamping fingers. With large hydro-generators, the specific eddy current losses in these regions can reach high values and can cause local thermal problems. For both reasons, an accurate determination of these losses is a matter of particular interest in the machine design. The paper presents an analytic calculation method based on the Biot-Savart method with an appropriate application of the method of images. From the evaluated end region field, the eddy currents in the stator clamping plates are determinated using a local 3D analytical calculation model. Due to the nonlinear magnetic material of the stator clamping plates, an iterative computation of the image currents and the eddy currents has to be applied.