Air cooling apparatus for electric machine

An electrical machine having a stator comprising:

• a winding overhang,
• a rotor arranged rotatably about a rotor axis in the stator, and
• a heat exchanger,
• wherein the heat exchanger is fluidically connected to the winding overhang via a coolant shaft, which is arranged radially outside the winding overhang, runs at least partially approximately along a circumferential direction, and is delimited in a radial direction by an outer surface, so that the winding overhang can be cooled by a continuous flow of a fluid over the heat exchanger and the winding overhang, and
• multiple guiding elements being arranged in a distributed manner along a circumferential direction in the coolant shaft in order to redirect a flow of a fluid oriented in the circumferential direction in the coolant shaft at least partially into a radial flow towards the winding overhang and to distribute the flow to multiple regions of the winding overhang,
• wherein the multiple guiding elements are arranged with a spacing from the outer surface, and
• wherein the multiple guiding elements have different spacings from the outer surface, wherein the multiple guiding elements have a smaller spacing from the outer surface at an increasing distance from the heat exchanger in the direction of flow.