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Synchronous Motors and Converters; Theory and Methods of Calculation and Testing

Synchronous Motors and Converters; Theory and Methods of Calculation and Testing


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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. 1913 edition. Excerpt: ...that their spirals are pointed in opposite directions. Owing to the form of these curves, the distance from their points of intersection to the center is proportional to the phase-angle between the two disks, or the lag of one with respect to the other. The point of intersection of two slits forms a small opening traversed by rays of light which, in turning, make a circle that expands or contracts in proportion to the phase-angle. The radius of the circle can be measured on a fixed scale which is graduated directly in angles. Bedell and Ryan have used this method to determine the phaseangle between E.M.F.'s, by bringing this phase-angle to zero when the poles are in line. The currents are measured by means of an electrodynamometer. The E.M.F.'s are deduced from the excitationcurves. Their vectors are then drawn with an angle between them equal to the measured phase-angle, and, from these, the resultant vector is obtained, in magnitude and in phase, by completing the parallelogram. The current is known, in magnitude. Its phase, with respect to the resultant E.M.F., is deduced from the reactance, which is known by means of the expression _ reactance 'resistance' or it can be deduced from an oscillograph diagram. We then have all that is necessary to draw the diagram. The results are sufficiently concordant with the theory, but they indicate no new phenomenon, except the discontinuity already mentioned. For more complete details see the author's original paper. Advantages and Disadvantages of Synchronous Motors. The characteristic features of synchronous motors, constituting their advantages and disadvantages, may be summarized as follows: (1) Their construction is as simple as that of alternators, and it enables them to be connected directly to...


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Product Details
  • ISBN-13: 9781236540928
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 84
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1236540921
  • Publisher Date: 01 Jun 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr


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