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The Dynamo Volume 2; Its Theory, Design and Manufacture

The Dynamo Volume 2; Its Theory, Design and Manufacture


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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: ... Av to A2, and leakage from Aj to B2, the fall of magnetic potential over that part of their course which is common to both must correspond to their joint density, and not to that of either set taken separately. Hence the addition of fresh paths would involve a distribution of the lines different from that assumed in our first approximation and a recalculation of their amount, and such rearrangement might result in a slightly higher value for the leakage permeance. Still, if the leakage field be regarded as distributed mainly after the fashion indicated above, a close approximation may be made to the ampere-turns actually found to be required by the field-magnet when the machine is tested. A certain amount of judgment is required in the first instance in selecting the direction of the several paths, none of which intersect: but to guide us in this, actual experiment may be called to our aid, if a machine with the required type of field-magnet is at hand.1 If a needle be fastened to a thread passing up the centre of a hollow tube of wood or cardboard, and the end of the thread be held so as to prevent the needle from being drawn to a pole, it can be used as an exploring magnet, and on plotting the directions in which it sets itself a good idea can be obtained of the distribution of the leakage flux. A partial compensation for the difficulty of accurately determining the somewhat vague and indefinite factor, P, lies in the fact that a considerable percentage error in its determination produces, under ordinary conditions, but a small percentage of error in the total number of ampere-turns required to produce the useful field through the armature; for this total number of ampere-turns is the sum of those required for the armature and air-gaps and those required...


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Product Details
  • ISBN-13: 9781235975349
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 252
  • Spine Width: 13 mm
  • Width: 189 mm
  • ISBN-10: 1235975347
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 458 gr


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