Direct- And Alternating-Current Machine Design; Being Instructions for the Design of Motors and Generators
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Direct- And Alternating-Current Machine Design; Being Instructions for the Design of Motors and Generators

Direct- And Alternating-Current Machine Design; Being Instructions for the Design of Motors and Generators


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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. 1908 Excerpt: ...Par. 81, the constant loss percentage enters as c; therefore. i X 3.1 =4.1%; the variable loss is Jt, from which J x 0.8 = 0.6% is obtained. Therefore the losses on three quarter load amount to 4.7% of the input; that is, the efficiency is equal to 95.3%. The efficiency curve of Fig. 24. indicates for three quarter load the same figure, namely 95.3%. Ans. From the above results it is seen, that if the efficiency for any tiro loads be known, the efficiency for any other load can he easily calculated with satisfactory exactness. 83. Example 9.--Supposing the full load efficiency of a gener ator is 92% and the half load efficiency is 86%, what will be the efficiency at two thirds load? Solution: The loss in the first case is 8% = c + v; and in the second, 14% = 2Xc + v; from which we obtain 28--8 = 3c, or c = 6.66% and v = 1.34% of the full load. The losses at two thirds load will then be equal to f X 6.66 + X 1.34 = 10.9%, which equals an efficiency of 100--10.9 = 89.1 % at two thirds load. Ans. 84. Subdivision of Losses.--By specifying any two efficien cies, the constant and variable losses are more or less fixed and the proper subdivision of the different items will be the next step. This work can be achieved on the basis of experimental data and empirical formula?. 85. Friction and Ventilation Losses.--As the friction and ventilation losses are uncertain to calculate, it is found advisable to keep on the safe side when using the data given in the Table 8. Fig. 25 indicates the usual average friction and ventilation losses as experimentally found in commercial machines. TABLE S.-CSDAI, LIMITS OF FRICTION ASD VENTILATION LOSSES, FOB DIFFERENT SIZES OF ALTERNATORS. The sources of the above losses are, the friction between the bearings and the shaft; friction ...


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Product Details
  • ISBN-13: 9781156688212
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 96
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1156688213
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 186 gr

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Direct- And Alternating-Current Machine Design; Being Instructions for the Design of Motors and Generators
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