Rotor for electric machines, particularly turbogenerators

Claim 1

A rotor for a turbogenerator, comprising a rotor body having axial slots, a rotor shaft extending from the rotor body at a boundary therebetween, liquid-cooled, half turn windings having axial conductors disposed in said rotor slots and cross conductors extending between said axial conductors, said cross conductors being radially positioned on top of each other in cross conductor stacks, said cross conductor stacks being axially spaced from each other to form free spaces between adjacent cross conductor stacks, each of said cross conductors having a blockshaped nose connector having internal ducts providing a path for coolant to and from said cross conductors, each of said nose connectors projecting in an axial direction beyond the axial side of said cross conductors into said free space between adjacent cross conductor stacks, a cooling liquid chamber disposed about said rotor shaft, coolant tubes leading from said liquid chamber to said nose connectors, said coolant tubes having a first portion extending generally axially from said chamber to said boundary between said rotor body and rotor shaft, said coolant tubes having a second U-shaped elastically deformable portion which extends the coolant tube in an opposite axial direction, said first and second portions being disposed radially inwardly of the most radially inwardly disposed cross conductor, said coolant tube having a third portion extending radially into said free space between adjacent cross conductor stacks, said coolant tube having a fourth portion extending generally parallel to said cross conductors for connection to a respective nose connector disposed in said free space between adjacent cross connector stacks, the radial dimension r of said cross conductors and the axial extent a of said nose connectors being at least as large as the outer diameter d of said coolant tubes including the minimum radial wall thickness w of the nose connector in the region of the connection end of the coolant tube to its respective nose connector.