Abstract: A rotor device for an electric machine, comprising: a rotor which comprises a rotor laminated core having a plurality of pole legs which project radially from a central axis of the rotor and can be wrapped around by respective rotor windings; at least one cooling fluid line, which extends in the circumferential direction between adjacent pole legs with its longitudinal extension direction parallel to the central axis of the rotor, and which is designed for a cooling fluid to flow through it for cooling of the rotor; and at least one collecting ring, which is provided on an end face of the rotor and is designed to collect cooling fluid flowing along the end face and to supply it to the at least one cooling fluid line.

Abstract: A liquid-cooled rotor for an electromechanical energy converter has a rotor shaft designed, at least in portions, as a hollow shaft and having a first, open axial end, a liquid-guiding device extending through the first end into the rotor shaft, wherein an annular liquid space is between the liquid-guiding device and the rotor shaft in the radial direction, and the liquid-guiding device has an interior space for guiding liquid and a liquid inlet opening into the interior space and arranged at a first axial end of the liquid-guiding device, the liquid-guiding device, at a second axial end, is received in the rotor shaft and guiding relative to the rotor shaft, and has a liquid outlet opening fluidically connecting the interior space to the annular liquid space, and the liquid outlet opening is between the first and second ends of the liquid-guiding device in the axial direction.

Abstract: The invention relates to an electrical machine, such as a motor vehicle that includes a rotor connected to a hollow shaft mounted such that it can rotate about an axis of rotation. The electric machine also includes a rotary transformer that includes a first slip ring and a first brush adjacent thereto. The first slip ring may be arranged inside the hollow shaft and is connected thereto. The invention also relates to a motor vehicle that includes a drive wheel that is operatively connected to the electrical machine.