Patent ID: 8686607

Claim:
An electrical machine, comprising: a rotor defining a rotor axis and having a single radial cooling slot to divide the rotor in midsection, said rotor including axial cooling ducts which issue into the radial cooling slot, said cooling ducts having first, second and third cooling ducts, each defined by a central axis, wherein the central axis of the first cooling duct extends in closer proximity to the rotor axis than the central axis of the second cooling duct; and a spacer arranged in the radial cooling slot and constructed to route a first cooling stream from the first cooling duct to the second cooling duct, said spacer including a plurality of discs, wherein a second cooling stream is introducible into the third cooling duct and directed radially to the outside by the spacer, with the third cooling duct defined by a central axis which extends coaxially to the second cooling duct, wherein the rotor is divided into two in its axial direction by the radial cooling slot which is formed by the spacer with the discs, wherein the discs each have a passage opening with centers rising in a direction of a cooling stream from one of the discs to a next one of the discs in a radial direction.