Alternating Current Motors
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Alternating Current Motors

Alternating 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. 1909 Excerpt: ...N M; this current is in the same electrical structure with the current, J K, and the two combine to produce the "negatively revolving secondary exciting current," shown by curve, K M J N, which is elliptical as to space representation. It is interesting to observe that the actual " speed field " current in the secondary varies directly with the speed, but that the component of the secondary current which reacts directly upon the transformer field varies with the square of the speed, or, more correctly, with the square of the "speed field." It will be noted that on account of this fact the total " quadrature exciting watts" of the single-phase induction motor vary directly with the square of the " transformer field " plus the square of the " speed field." Thus the true exciting watts of the machine at any speed are directly proportional to the sum of the squares of the densities of the fluxes traversing the several magnetic paths, as was mentioned previously. CHAPTER X. SYNCHRONOUS CONVERTERS. Synchronous Commutating Machines. The term "synchronous commutating machines" refers to all motors or generators which receive or deliver both alternating and direct current. The machines discussed below are rotary converters and double-current generators, and comparisons are made with the capacities of alternating-current generators or motors of different number of phases. For simplicity in treatment, the rotary converters are assumed to deliver at the direct-current commutator all of the power received at the alternating end; that is, the output is assumed equal to the input in determining the relative currents on each side, though, as will be seen later, the armature copper loss is properly accoun...


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Product Details
  • ISBN-13: 9781152016385
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 94
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1152016385
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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