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Proceedings at the Convention Volume 23

Proceedings at the Convention Volume 23


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...construction is not essentially different from that of the ordinary engine-type machine. In the construction of the field, however, the centrifugal stresses necessitate a construction of greater inherent strength. Recent practice embraces two designs: one of built-up form used in six or more pole fields, and the other of a solid steel casting thoroughly annealed, bored for the reception of the shaft, and slotted axially for the reception of bar or strap windings, which are insulated and confined in position by wedges, this being for two poles. A pertinent comparison may be made in the two types of 5000-kw generators which will form the power equipment of the Rapid Transit subway in New York city. The engine-type generators, run at 75 r.p.m., are approximately 40 feet in diameter and weigh 980,000 pounds. The turbine generators, on the other hand, run at 750 r.p.m., are 12 feet 6 inches in diameter and weigh 234,000 pounds, the weight of journals and shaft excluded in each case. The engine-type generators have 40 poles and the turbo-generators, four, giving the same frequency--25 cycles per second. The turbine, however, makes possible the use of a still further type of generator, which although presenting difficulties in design at ordinary engine speeds, becomes ideally suited for direct connection to the turbine, both by reason of its electrical characteristics and its inherent strength of mechanical construction. It is well known that if the ordinary squirrel-cage induction motor runs below synchronism with the system upon which it is operated, it will absorb power from that system proportionate to the slip or drop in speed. If it is run in synchronism therewith by external means, it will absorb no power: and, if run above synchronism, it will become a gen...


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Product Details
  • ISBN-13: 9781235942631
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 196
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1235942635
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 358 gr


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