Rotor of an electric machine with winding overhang support

A rotor of an electric machine, in particular a motor-generator set for pumped storage units, having a rotor body which is arranged on a hub, is constructed from laminated metal sheets and is held together by axially extending clamping bolts, having slots on the outer circumference of the rotor body into which a rotor winding is inserted and held there against the effect of centrifugal force, the winding ends, which emerge axially from the rotor body and form the winding overhang, being secured against the effect of centrifugal force by supporting means having a support ring which is at the same time a thrust plate for the rotor body, wherein press fingers are arranged on the end face of the last metal sheet of the rotor body, wherein the support ring comprises at least two rings which are spaced apart in the axial direction and are supported at their inner circumference on the hub, the rings being clamped together in the section of the rotor body near an axis together with the press fingers by means of a first tension bolt axially penetrating the rotor body, wherein there are provided in the section further from the axis second tension bolts which axially penetrate only the said rings and clamp the rings together axially, wherein there are provided third tension bolts, which radially penetrate the winding overhang and act at least on the outer circumference of the outer ring, from an axial point of view, and wherein there are provided on the outer circumference of all the rings a multiplicity of axially extending, mutually aligned, half-closed slots which are distributed in the circumferential direction and into which a straight edge provided with radially extending threaded bores is pushed in each case, into which threaded bores the said third tension bolts are screwed.