Image from page 192 of "Transactions of the Institution of Mining Engineers" (1898)
Subjects: Mineral industries
Publisher: Newcastle-upon-Tyne : The Institution
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign
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d end rings the core is compressed by these members rightup to the periphery of the core-plates, thereby preventing the spreadingof the plates, which would open up pockets for corrosion. (6) If the barspassed the edges of the core with a gap, before linking with the short-circuit-rings, according to usual practice for an air-machine, the waterlosses which are inevitable would be greatly increased. (c) A veryrobust construction is obtained and the exposed surfaces are reduced toa minimum. The bars are made of drawn copper, and are enamelled where theypass through the core. Each end of a bar is drilled in the centre fora distance equal to the axial length of the end ring; steel pins are driveninto the holes, thereby swelling the end of the bars and making positivecontact with the end rings. Before assembly, the ends of the bars andthe holes in the rings are tinned, and after assembly the whole of thejoints are sweated up. There is no danger of heating on account of the water coeling, so
Text Appearing After Image:
Fig. 6. Portable Submersible MOTOR-PrMP. 172 TRANSACTIONS INSTITUTION OF MINING ENGINEERS. [VOL. LXI. that there is no trouble from sweated joints. For larger units, however,the bars are welded to the rings. The impeller is of the single-inlet type, cast in one piece, with bladeshaving the form of involutes at entrance and exit. The w^hole of the component paits for this motor-pump are shown inFig. 7. The motor-stator (1) is a totally-enclosed cast-iron frame, andthe core is assembled under pressure with stiff-ribbed end-plates whichcompletely cover each end of the core. The winding takes the standardform for three-phase, single-layer, star-connected type, with a two-planeoverhang. The conductors are of circular cable, built up of a large number offinely-stranded and tinned-copper wires, insulated with a specialpreparation of indiarubber. The lays of the strands are so arranged asto give a minimum diameter for a given cross-sectional area, and to make possible an easy and safe bend on
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