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Examples in Electrical Engineering

Examples in Electrical Engineering


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 edition. Excerpt: ...would soon exceed that of the supply mains, were that possible. The tractive force being thus increased in a proportion more nearly as the square of the current, makes the series motor particularly suitable for overcoming steep gradients and other heavy loads with less heating and waste of energy than would be the case with a shunt motor, for the series motor will automatically reduce its speed up hill, and by increasing its field strength take less increase of current to produce the necessary tractive pull. When getting up speed the car has to store an amount of energy, equivalent in foot pounds to half its mass, multiplied by the square of its velocity in feet per second. The extra pull required to do this will depend upon the time taken to attain the speed, and we can write the work to be stored in foot pounds, as---v--= K 2g V 3OOO When g is taken as 32, we can simplify this to--K = WS2 X 75-3 foot pounds where W = tons weight of car and S the speed to be got up in miles per hour. Now, if this store of energy is to be acquired in m, minutes, we must remember that the car in gradually getting up the speed of S miles per hour will go through a distance of--SX5280 m X--?--= I feet say 60 X 2' S since its average speed during the time will be-if the acceleration be uniform. And through this distance a pull over and above that required to overcome the tractive resistance will be required of--y pounds or the extra pull during the time of ///, minutes, to get up speed of S miles per hour will be--WSSX75-3 WS 5 =--X 1711 pounds 44S77Z m r Or if speed is to be attained in t seconds, the extra pull is--1027 WS j pounds If also p be the pull per ampere, the current required will then be--C = w + W2-40 amperes to which must be added the extra...


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Product Details
  • ISBN-13: 9781152246553
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1152246550
  • Publisher Date: 01 Apr 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr

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