E. Schmidt, C. Grabner:
"Comparison of Numerical and Analytical Calculation Methods for the Mechanical Deformation of Roebel Bar Conductors";
Talk: 1st Asia-Pacific International Conference on Computational Methods in Engineering (ICOME), Sapporo (Japan); 11-15-2003 - 11-19-2003; in: "Proceedings of the 1st Asia-Pacific International Conference on Computational Methods in Engineering (ICOME)", (2003), 491 - 500.

The deformation process of Roebel bars embedded in slots of electrical machines mainly depends on the acting electromagnetic forces inside the current carrying regions and the mechanical preload due to the slot wedge. Additionally, the mechanical properties of the utilized materials and the nonlinear saturation of the surrounding iron parts determine the amount of the mechanical displacements. With this fully coupled electromagnetic-mechanical problem, the behaviour is completely different between the two cases of loose and fixed bars. Thereby, electrical load cases with inphase and opposite phased currents represent the occurring critical operational states. The paper compares results obtained from coupled electromagnetic-mechanical finite element analyses with results from analytical calculations for various industrially used material compositions of the bar insulation.

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