Abstract: A slip ring system for an electrical machine, comprising: slip rings, which are arranged so as to rotate about an axis of rotation, for transmitting current to the electrical machine; contact brushes which are in contact with the slip rings; an impeller which is mountable so as to surround the axis of rotation and in a rotationally fixed manner in relation to the slip rings, the impeller being adapted to generate an air flow in a plane perpendicular to the shaft; and a filter which surrounds the impeller such that an imaginary radial extension of the impeller meets the filter, and a porosity of the filter decreases in a radially outward direction between a radially inner edge of the filter and a radially outer edge of the filter; wherein a first thickness of the filter in a radial direction is at least 50% of a second thickness of the filter in an axial direction.

Abstract: A rotor for an asynchronous machine includes a laminated rotor core which is made of a plurality of rotor laminations that are stacked in a longitudinal direction of the rotor, an intended rotational axis of the rotor running in the longitudinal direction; and a rotor cage that has a number of rotor bars, which run through the rotor laminations in the longitudinal direction, and at least one short circuit ring, which is arranged on a laminated rotor core end lying in the longitudinal direction such that the short circuit ring electrically connects the rotor bars together. The laminated rotor core contains at least one rotor lamination in a region at the end. This rotor lamination has a greater strength and/or a greater rigidity in a radial direction with respect to the rotational axis than the other rotor laminations.

Abstract: A slip ring system for an electrical machine includes slip rings, which are arranged such that they can rotate about a rotation axis, for transmitting current to the electrical machine; contact brushes which are in contact with the slip rings; and an impeller which can be fitted so as to surround the rotation axis and in a rotationally fixed manner in relation to the slip rings and is adjusted to generate an air flow in a plane perpendicular to the shaft. The impeller has two disc-shaped side walls which surround the shaft and between which a plurality of vanes extend. A filter surrounds the impeller so that an imaginary radial extension of the impeller meets the filter.

Abstract: A rotor for an asynchronous machine includes a laminated rotor core which is made of a plurality of rotor laminations that are stacked in a longitudinal direction of the rotor, an intended rotational axis of the rotor running in the longitudinal direction; and a rotor cage that has a number of rotor bars, which run through the rotor laminations in the longitudinal direction, and at least one short circuit ring, which is arranged on a laminated rotor core end lying in the longitudinal direction such that the short circuit ring electrically connects the rotor bars together. The laminated rotor core contains at least one rotor lamination in a region at the end. This rotor lamination has a greater strength and/or a greater rigidity in a radial direction with respect to the rotational axis than the other rotor laminations.