Rotor of an electrical machine having a directly cooled rotor winding

Claim 1

A rotor of an electrical machine having a directly cooled rotor winding, comprising: plural winding conductors forming a conductor bundle and located one above the other in a groove, the conductors of each bundle including an uppermost conductor beneath which the other conductors of the respective bundle are located, the conductors of each bundle fastened in said groove by means of a groove wedge, the winding conductors each having at least two adjacent half cooling ducts running in a longitudinal direction of the conductors; at least two gas outlets provided in a central section of the bundle and offset relative to one another in a rotor peripheral direction; separating means provided in the central section for interrupting the half cooling ducts at plural interruption points; at each interruption point, each half cooling duct being in connection with a respective approximately radially extending duct which ends at an upper surface of the rotor; the gas outlets of a conductor bundle being offset relative to one another in the conductor longitudinal direction, and the radial ducts emerging into holes passing approximately radially through the groove wedges; wherein the radially extending duct associated with each conductor, except the uppermost conductor, extends completely through the winding conductors located above the respective conductor.