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The Electrical Engineer Volume 6: (English)

The Electrical Engineer Volume 6: (English)

          
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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. 1890 Excerpt: ...as ordinarily used in street car motor work, the number of teeth in c and d would be 95 and 105. By placing two more gears which have a different velocity ratio by the side of c and d, with a clutch arrangement, whereby either of the gears on the driven axle may be engaged with it, two different speeds may be provided for at very slight additional expense. EXPERIMENTS ON THE BEST SPEED FOR DYNAMO-ELECTRIC MACHINES. BY M. RECHNIEWSKI. A good dynamo ought to run regularly, without sparking, should give a good efficiency and ought not to heat dangerously by running for many hours, or even for several days, if necessary. The first two conditions can be fulfilled by careful mochanical construction on the one hand and good electrical designing on the other. Of this 1 will not speak more for the present. The efficiency depends on a complex series of different phenomena which have been heretofore often discussed. This question of efficiency is directly connected with that of heating, of which I am going to speak more in detail. Indeed, efficiency and heating both depend on the quantity of energy transformed into heat in the interior of the machine. Heating is the foe from which designers have most to fear, and it is the thing above all others which limits performance of even the best.machines. It has often happened, for example, in the laboratory of the Societe pour L'Eclairage Electrique, that a dynamo designed for 14,000 watts was forced for an hour up to 22,000 watts, and the machine ran well and did not break down: but the temperature had risen at the end of an hour to 80deg. As it takes about two hours for this machine to attain its steady temperature, it was clear that this forced output could not be continued without danger. It has often been proposed to avo...


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Product Details
  • ISBN-13: 9781236386090
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 702
  • Series Title: English
  • Weight: 1234 gr
  • ISBN-10: 1236386094
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 36 mm
  • Width: 189 mm


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