Cooling apparatus for cooling an electrical machine with coolant transfer in the radial direction

It is a cooling device for cooling an electrical machine having an axis of rotation about a rotatably mounted rotor, which is disposed on a central rotor shaft indicated. The cooling device comprises at least one stationary condenser which communicates with at least one stationary cold head in thermal contact, and at least one arranged on the rotor first coolant channel. The first coolant channel is at least one opening of an outer wall of the rotor shaft fluidly connected to the condenser in combination, and the rotor shaft is provided in its interior with at least one conveying vane for conveying cooling medium from an area of ​​the condenser in the direction of the first coolant channel. Furthermore, an electrical machine with a rotatably mounted about a rotation axis rotor, which is disposed on a central rotor shaft, and such a cooling device is provided.