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Polyphase Electric Currents and Alternate-Current Motors

Polyphase Electric Currents and Alternate-Current Motors


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About the Book

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. 1903 Excerpt: ...at a pressure of 2000 volts (and frequency of 38 periods per second), runs at a speed of 200 revolutions per minute. Tested on a brake, it gave up to 200 horse-power before stopping. The stator coils, and the way in which the end connections are arranged, can be seen from Fig. 171. The plan of winding is the same as that shown in Fig. 124, there being 28 turns in each coil. There are 40 coils (20 in each phase-circuit) threaded through 80 holes. In the rotor there are 180 conductors connected in three circuits, the ends of which are brought to slip-rings for the purpose of introducing resistance at starting. Motors of the same type are made for ordinary monophase supply, and at a pressure of 2700 volts will yield 120 horse-power at 300 revolutions per minute. Brown's motors arc now extensively used for distribution of power in factories, the 3-phase current being particularly applicable to isolated plant of this description. The large installation at Schonenwert, near Aarau, has been referred to on p. 37. Another example is furnished by the 2-phase distribution in the extensive engine-works of Weyher and Richemond at Pantin, near Paris. In these works there were formerly three separate steam-engines of 120, 80 and 50 horse-power respectively. These have now been replaced by a single horizontal engine of 200 horse-power (capable of working up to 400 horse-power), at 60 revolutions per minute. This engine drives three 2-phase generators, each of 88 kilowatt capacity, having revolving drum-wound armatures aud stationary 8-polo field-magpets. The frequency is 40 periods per second. Usually only two of these generators are run, the third being a reserve machine. Down to the present time the numler of motors installed in the different shops is 17, having a total ...


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Product Details
  • ISBN-13: 9781231688939
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 110
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1231688939
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 213 gr


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