GB1289828A - - Google Patents

Abstract

1289828 Securing coils for dynamo-electric machines ENGLISH ELECTRIC CO Ltd 21 Nov 1969 [3 Dec 1968] 57260/68 Heading H2A In a dynamo-electric machine having two stator conductors 17, 18 per slot, the frustoconical structure formed by the end windings of the bottom conductors 18 is clamped between outer rings 26, 27, 28 and intermediate rings 40, 41, 42 and the frusto-conical structure formed by the end windings of the top conductors 17 is clamped between the intermediate rings and one or more inner rings, as 45, 46, the outer rings being supported from the stator core. A core end plate 12 and a copper eddy current screen 14 are disposed against the end of stator core 10, and metal brackets 15 are secured to the end plate 12 to support laminated, resin-impregnated compressed wood brackets 16, against which the end windings are disposed. Arcuate insulating segments 29 extend between adjacent brackets 16. The outer, intermediate and inner rings are formed of filament wound impregnated glass fibre material and are bolted together, the intermediate rings being formed of six arcuate segments whose joints are at the mid-phase positions of the end windings. Struts 44, of the same material as bracket 16, and wedges 47, 49 are disposed between the conductors 17 and the inner rings. A packing material 60, 61, 63. e.g. resin reinforced with glass fibres or asbestos rope, extends between the conductors and the rings and struts, at least one of the inner rings being formed with tapped holes 48 for jacking screws which tightly clamp the assembly before the packing material is cured. The teeth of a phenolic coarse-weave glass fibre toothed ring 25 extend between adjacent conductors. The conductors insulation is, as shown, thicker where the conductors enter the core slots 11.