The invention relates to an electric machine having a stator; having a rotor supported by a shaft; having a brush-slip ring device, the slip ring thereof enclosing the shaft and rotationally fixed to the same; having a cooling system for cooling the brush-slip ring device. The invention is characterized by the following features: ventilator vanes are rotationally fixed to the shaft and comprise an airflow for feeding air to the brush-slip ring device.
