Electric Generators
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Electric Generators

Electric Generators


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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. 1900 Excerpt: ... = 4 x 5 x 10 x M x lO-8, M = 250,000,000 lines. The armature iron could not properly be run at more than 100,000 lines per square inch. Therefore, the cross-section of the armature = 2,500 square inches at least. It thus appears that the armature would have to be 50 in. in diameter and 50 in. long, or else some other equally extreme dimensions. The field turns would be of great length, and as the air gap density would be very high, there would be need for very many field ampere turns. Without carrying the calculations any farther, it is apparent that, as regards cost of materials alone, the machine would be poorly designed. On the other hand, suppose the armature had 2000 face conductors. Then T = 1000; 500 = 4 x 1000 x 10 x M x 10-8, . M = 1,250,000 lines. Necessary cross-section = 12.5 square inches as far as-regards transmitting the flux. Therefore, the magnet cores would be 4 in. in diameter. But to have on the armature 2000 face conductors, each carrying 100 amperes, would require a very large armature, probably as large a diameter as was necessary in the former case; but then it was a question of carrying a large magnetic flux, which determined the size of the armature. In this case we should have a very large weight of armature copper, but otherwise the material would not cost much, if we look no further into the matter of field copper than relates to that necessary to obtain the required flux at no load. But, nevertheless, on the score of material alone, some intermediate number of conductors would be found to give a more economical result. Influence Of Armature Reaction In These Two Extreme Cases. In the first case, that of the armature with only five turns, there 5 x 100, . would have been but = 250 ampere turns per pole-piece on the armature, whic.


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Product Details
  • ISBN-13: 9781152890633
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 86
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1152890638
  • Publisher Date: 09 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr


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