Electric machine having efficient internal cooling

摘要

An electric machine includes a stator device having axial first cooling channels, and second and third cooling channels. The third cooling channels are arranged in the first cooling channels and extend at least substantially along an entire axial length thereof. The stator device is configured for inflow and outflow of a liquid cooling medium at least partially through the second cooling channels and for the liquid cooling medium to be conducted through the third cooling channels. A rotor is arranged on a rotor shaft for rotation around a rotational axis. Limiting elements are mounted on the stator device axially on both sides to thereby bound an internal rotor space which is in communication with axial ends of the first cooling channels of the stator device to thereby establish an internal air-cooling circuit from the internal rotor space through the first cooling channels and back into the internal rotor space.

主权项

1. An electric machine, comprising:
a stator device having axial first cooling channels, and second and third cooling channels, said third cooling channels arranged in the first cooling channels and extending at least substantially along an entire axial length of the first cooling channels, said stator device being configured for inflow and outflow of a liquid cooling medium at least partially through the second cooling channels and for the liquid cooling medium to be conducted through the third cooling channels; a rotor shaft; a rotor arranged in a rotationally fixed manner on the rotor shaft; a bearing assembly supporting the rotor shaft so that the rotor shaft and the rotor are rotatable around a rotational axis; and limiting elements mounted on the stator device axially on both sides so that the stator device and the limiting elements bound an internal rotor space radially externally and axially on both sides in communication with axial ends of the first cooling channels of the stator device to thereby establish an internal air-cooling circuit from the internal rotor space through the first cooling channels and back into the internal rotor space.