Patent ID: 8288901

Claim:
A device to cool a stator and a rotor with a salient pole winding in an electric machine comprising: a fan mounted in a casing of the electric machine, wherein the fan is driven externally of the electric machine; a cooling device mounted on a pressure discharge side or a suction inlet side of the fan; a feed channel between the cooling device and the stator defining a flow passage for a gaseous cooling medium flowing from the cooling device to the stator, wherein the feed channel is adjacent an inner surface of an outer wall of the casting such that heat energy from the gaseous cooling medium transfers to cold works water flowing over the outer wall of the casting, and a gaseous cooling medium flow circuit including a radial passage through the stator, an axial air gap between the stator and rotor, and pole gaps extending axially through the rotor, wherein the air gap and pole gaps open at an axial end of the air gap and of the rotor respectively, wherein the gaseous cooling medium flows from the axial end of the air gap and the axial end of the rotor to the fan.