Abstract
This paper is concerned with dynamic instability of a turbine generator to friction between rotor slot wedges and the rotor. The energy transferred due to friction can be reduced by increasing wedge length, coefficient of friction or normal force or by reducing the cross-section area of the wedge. The bearing damping is normally sufficient to master the energy input from the wedges. This bearing damping becomes more powerful the weaker the bearings are. The size of the rotor cross-section area affected by the wedge is difficult to estimate but it is shown to be of minor importance for the results, provided it is larger than the wedge-cross-section area.
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