Patent ID: 7952243

Claim:
An electrical machine, comprising: a stator having a stator core having incorporated therein a coil winding with axially projecting end windings; a rotor having a rotor shaft which defines an axis, and a rotor core which is seated on the rotor shaft; at least one coolable cap ring in an axial area defined by an adjacent one of the end windings and the rotor shaft, the coolable cap ring occupying at least part of an annular intermediate space which is located in the axial area; and at least one hollow-cylindrical cooling element seated firmly on the rotor shaft in surrounding relationship to at least part of the annular intermediate space, the at least one cooling element has a rotor shaft sleeve with first radial projections in axial spaced-apart relationship, wherein the coolable cap ring has second radial projections in axial spaced-apart relationship for engagement without contact in intermediate areas defined by the first radial projections, when installed.