Rotor of an electric machine

Abstract

A rotor () of an electrical machine is already known, comprising a rotor body () which can be rotated about a rotor axis () and comprising several cooling ducts () which have a cooling duct opening () at each of its ends, wherein one cooling duct opening () of one of the cooling ducts () is arranged radially further outside than the other cooling duct opening () of the same cooling duct (). The driving force for generating an airflow through the cooling ducts () is generated by a radial offset between a channel of a hollow shaft of the rotor and one of the cooling duct openings of the rotor. In the rotor () according to the invention, the driving force for generating the airflow is generated solely in the cooling duct () in question of the rotor (). According to the invention: the first cover element () covers the radially innermost partial cross-section of the cooling duct opening () in question with an edge section which is radially outward with respect to the rotor axis () and in each case leaves a radially outermost partial cross-section of the same cooling duct opening () uncovered as a cooling duct outlet (); the other cooling duct opening () of the same cooling duct () is in each case a cooling duct inlet; an inflow which is axial with respect to the rotor axis () is provided in each case upstream of the cooling duct inlets (); and the geometric centre of gravity of the cooling duct outlet () is in each case offset in the radial direction relative to the rotor axis () with respect to the geometric centre of gravity of the cooling duct inlet () of the same cooling duct ().