DYNAMO ELECTRIC MACHINE ROTOR

1,234,986. Cooling dynamoelectric machine rotors. ENGLISH ELECTRIC CO. Ltd. 20 June, 1969 [28 June, 1968], No. 30924/68. Heading H2A. In a liquid-cooled dynamoelectric machine rotor, such as of a large A.C. generator, which includes hollow windings having at each end of the rotor end turns 12 about which is disposed a retaining ring 13 having within each outer end an end plate 14, at least one such plate has therein at least one chamber 15 for conveying cooling liquid, e.g. pure demineralized water, to or from, the windings via respective pipe connectors 24, 20 between the chamber and the end turns 12 and an axially extending bore 16 in the rotor shaft end 11. In the embodiment shown, the connector 20 is flexible, and the plate 14 and liners 17, 19 of shaft bores 16, 18 are of stainless steel. The chamber 15 may be annular or comprise a plurality of short arcuate separate chambers, the liquid being supplied and discharged at respective ends of the rotor. In Fig. 2 the plate (32) is secured to the shaft end 11 and the ring (30, 31) comprises two axially spaced parts.