Rotating electric machine in internal rotor design for converting mechanical energy into electrical energy or vice versa

Abstract

A rotating electric machine (100) in an internal rotor design for converting mechanical energy into electrical energy or vice versa, comprising: - a stator (2), - a rotor (4) inside the machine (100) which is enclosed by the stator (2) and is or can be arranged non-rotatably on or attached to a rotatably mounted drive / output shaft (5) such that the drive / output shaft (5) including the rotor is rotatable about an axis of rotation R, and - a rotor cooling device designed to guide cooling medium along at least a part of the inner surface and / or through at least a part of the interior of the rotor (4) for heat dissipation mainly by thermal convection or to bring it close to the inner surface of the rotor (4) for heat dissipation by thermal radiation, wherein the drive / output shaft (5) has a free shaft end (5a) and the rotor (4) is or can be fitted onto the free shaft end (5a) and the rotor (4) is cup-shaped.wherein the rotor cooling device further comprises a stationary hollow cooling nozzle (3) extending in the direction of the rotational axis R of the rotor (4) from the open side of the cup-shaped rotor (4) into the interior of the cup and having, at its end (3a) facing away from the rotor (4), connected or connectable to a cooling medium source for supplying cooling medium, and having a cooling medium outlet (19) for discharging the cooling medium to the outside of the machine, wherein the end (3b) of the cooling nozzle (3) facing the rotor (4) is open and rib- or blade-like projections (7) and a vane (8) for forced cooling are located on the outside (3c) of the cooling nozzle (3).

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