Patent ID: 7812501

Claim:
A dynamo-electric machine rotor in which spaced core slots are formed in a cylindrical rotor core, rotor coils of stacked turns are fitted into the core slots to form multiple nested rings around a magnetic pole of the rotor, ends of the rotor coils are fixed by a retaining ring, and a spacer is arranged in each of circumferential gaps between the ends of the rotor coils, wherein each spacer includes contacting portions formed on at least one of two sides of the spacer, one of the contacting portions being formed at a radially inward position of the spacer and an other being formed at a radially outward position of the spacer, for forming coolant gas ventilating channels between the spacer, the rotor coils and the retaining ring, said coolant gas ventilating channels being radially separated into plurality, one being radially inward and an other being outward, and extending along a longitudinal direction of the spacer except for inlet portions of the coolant gas ventilating channels.