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Home > Art, Film & Photography > Electrical Engineer Volume 6; An Illustrated Record and Review of Electrical Progress
Electrical Engineer Volume 6; An Illustrated Record and Review of Electrical Progress

Electrical Engineer Volume 6; An Illustrated Record and Review of Electrical Progress


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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: ...different velocities when its temperature is, say, 40deg. above that of the surrounding air. The curve, a, in Fig. 5, represents the number of watts for the machine tried as above. Curve b represents the number of watts lost by hysteresis and Foucault currents at different speeds but in the normal field. The difference in the ordinates of these two curves represents the number of watts that are lost in the wire of the armature. As is plainly seen, the cooling increases quite rapidly with the speed and must be taken into account. The curve a should be determined for each type of armature, for it furnishes very valuable data for armature construction. It will be seen at once that it is impossible to give a formula for the heating of an armature as a function only of the watts transformed into heat and of the cooling surface. The form and the peripheral velocity of the armature will enter as important factors into this question. It is clear, too, that armatures which are more or less rough on the surface give different results; so much so that this single fact is sufficient to explain certain differences in heating which are observed in winding a given armature in different ways to preserve the same volume of copper and the same current density. The loss in the machine running empty as a motor being known, and the resistance of the wire being known, we can calculate the total loss at full load, and obtain then the commer and this gives us a total loss at full load of 983-19 watts. The total power developed a full load would be then 10,983 watts, and the commercial efficiency is consequently 0-91. This method of calculating the efficiency which was employed by the jury at the Paris Exposition of 1889 has been criticised. The principal objection is that the loss...


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Product Details
  • ISBN-13: 9781236458414
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 704
  • Spine Width: 36 mm
  • Width: 189 mm
  • ISBN-10: 1236458419
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 1234 gr


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