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Electrical Engineering Leaflets

Electrical Engineering Leaflets


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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. 1897 Excerpt: ...the energy expended in the cycle. As the limits of flux density during the reversal are increased, the energy expended in the iron increases. If the iron be carried from an intensity of $ = + 5,000 gausses to & =--5,000 gausses, the range of reversal will be 10,000 gausses. If now the range be doubled, or increased to 20 kilogausses, the energy expended in the iron per cycle will be approximately trebled. The energy expended in a cubic centimetre of iron undergoing periodical reversals of magnetism is approximately expressed by the equation W = rj 04's ergs per c. c, where rj, is a coefficient which varies from 0.002 for very soft iron to 0.080 in the hardest steels. When, therefore, the core of an armature of soft iron having a total volume of, say, 8,000 c. c. makes 12 revolutions per second in a bipolar flux from $ =-f-5,000 to--5,000 gausses, it will undergo one complete cycle or double reversal for each revolution. Consequently the expenditure of energy in the core by hysteresis, per revolution of the armature, will be 0.002 X 5,00016 = 0.002 X 828,600 = 1,657 ergs per c. c; or 8,000 X 1,657 = 13,256,000 ergs = 1.3256 joules per revolution, and at 12 revolutions per second a total hysteretic activity in the armature of 15.907 joules per second = 15.907 watts. For this reason the intensity in the armature is preferably kept much below saturation, in order to avoid the rapid increase in hysteretic loss at high densities according to the above rule. 152. If the three classes of loss of energy in a generator be summed, their total subtracted from the intake, is equal to the output, and this divided by the intake gives the commercial efficiency of the machine. Syllabus. The losses in a dynamo-electric machine are three; namely, mechanical, electrical an...


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Product Details
  • ISBN-13: 9781152514652
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 60
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1152514652
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 127 gr


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