Rotating electric machine that comprises the following features: - a rotor shaft, - an impeller wheel, - wherein the impeller wheel is arranged on the rotor shaft and is connected to the rotor shaft in a non-rotatable manner, - a housing part that encompasses at least in part a housing inner space of the electric machine, wherein the housing inner space is designed so as to receive the rotor shaft, - an opening on the housing part, through which the rotor shaft is guided in part out of the housing inner space, - a slip ring that is arranged outside the housing inner space and on the rotor shaft, - wherein the impeller wheel is arranged between the housing inner space and the slip ring and outside the housing inner space, as a consequence of which the impeller wheel is designed so as to generate the air movement for the purpose of carrying away dust from the opening wherein the impeller wheel of the rotating electric machine comprises the following features: - a hollow cylindrical base body having an outer peripheral surface, wherein the impeller wheel comprises an axis of rotation about which the peripheral surface extends in the circumferential direction of the base body, - a first end region that encircles the base body in the circumferential direction of said base body, and a second end region that encircles the base body in the circumferential direction of said base body, wherein the first end region and the second end region lie opposite one another in the direction of the axis of rotation, - a groove in the peripheral surface, wherein the groove extends in the circumferential direction of the base body along the peripheral surface and between the first end region and the second end region of the base body, and - at least one web-shaped impeller element that extends in the groove between the first end region and the second end region, as a consequence of which the at least one impeller element is designed so as to generate an air movement as the impeller wheel rotates about the axis of rotation and said air movement flows away from the peripheral surface. - a rotor shaft, - an impeller wheel, - wherein the impeller wheel is arranged on the rotor shaft and is connected to the rotor shaft in a non-rotatable manner, - a housing part that encompasses at least in part a housing inner space of the electric machine, wherein the housing inner space is designed so as to receive the rotor shaft, - an opening on the housing part, through which the rotor shaft is guided in part out of the housing inner space, - a slip ring that is arranged outside the housing inner space and on the rotor shaft, - wherein the impeller wheel is arranged between the housing inner space and the slip ring and outside the housing inner space, as a consequence of which the impeller wheel is designed so as to generate the air movement for the purpose of carrying away dust from the opening - a hollow cylindrical base body having an outer peripheral surface, wherein the impeller wheel comprises an axis of rotation about which the peripheral surface extends in the circumferential direction of the base body, - a first end region that encircles the base body in the circumferential direction of said base body, and a second end region that encircles the base body in the circumferential direction of said base body, wherein the first end region and the second end region lie opposite one another in the direction of the axis of rotation, - a groove in the peripheral surface, wherein the groove extends in the circumferential direction of the base body along the peripheral surface and between the first end region and the second end region of the base body, and - at least one web-shaped impeller element that extends in the groove between the first end region and the second end region, as a consequence of which the at least one impeller element is designed so as to generate an air movement as the impeller wheel rotates about the axis of rotation and said air movement flows away from the peripheral surface.