Synchronous machine provided with comb-shaped magnetic poles

Claim 1

A synchronous machine provided with comb-shaped cylindrical magnetic poles, and including a stator armature, a rotor, and exciting means, said stator armature comprising an iron core and an armature winding wound therearound, and said rotor comprising two opposite magnetic pole yokes, two cylinders supporting said yokes respectively, two shafts connected respectively to said cylinders for rotatably supporting said cylinders, and cylindrical magnetic poles supported respectively by said yokes, the magnetic poles supported by one yoke and those supported by the other yoke being disposed in an interfitting cylindrical comb-shape configuration: an improvement comprising a combination wherein each of said shafts has an axial cooling hole disposed therethrough; said poles have cooling holes provided therein, said pole cooling holes being disposed in the axial direction near the radially outward surfaces thereof, and terminating inwardly of the axial extremities of said yokes; and said yokes, poles, and shafts have intercommunicating branched cooling passages disposed radially and in communication at their outer ends with the axial ends of said axial pole cooling holes, and in communication at their inner ends with said shaft holes, wherein said hole in one of said shafts comprises a supply passage for a cooling fluid which passes through said one shaft, through said yokes and poles, and through the other of said shafts which comprises a discharge passage for said cooling fluid.