Abstract: A rotor of a cryogenic dynamoelectric machine comprises a supporting structure with radial slots therein separated by teeth. Coils of a superconducting field winding are placed in the slots and pressed by wedges fitted into axial grooves made in side walls of the slots. An annular shroud embraces the supporting structure. The outer surface of each wedge, facing the shroud, projects beyond the surfaces of the teeth arranged adjacent to the wedge, which also face the shroud. The shroud is provided with a radial interference fit with the outer surfaces of the wedges, with a first radial clearance formed between the shroud and the teeth. Provided between the surface of each wedge, facing the rotor axis and the opposite surfaces of the axial grooves, is a second radial clearance. The magnitude of each of the two clearances is no less than that of the interference fit of the shroud with the outer surfaces of the wedges.

Abstract: The rotor of an electric machine with a superconducting field winding has a hollow support structure with the superconducting winding, enclosed in a shrouding cylinder. Formed inside the shrouding cylinder, in the support structure, is a ring header communicating with the cooling ducts for the superconducting winding. In the internal cavity of the support structure is a trough for feeding the coolant communicating with the ring header in the large tooth area by means of radial holes spaced apart along the rotor axis, which receive heat-conductors with ducts for transferring the coolant from the trough to the ring header. On the periphery of the support structure, in the portion or sector of the support structure tooth, is formed a recess communicating with the ring header and having mounted therein other heat-conducting members extending in the radial direction and thermally insulated both from the support structure and from the heat-conductors.