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

Direct-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: ...length of the magnetic lines in the gaps is here taken 25 per cent. greater than twice the distance across from polepiece to armature core, because, when the machine is carrying current in the armature, the lines do not pass straight across in the direction of the radius, but are more or less inclined to the latter, owing to the distortion of the field. We therefore have: atg =.313 X 30,500 X 1 = 11,930 ampere-turns. The ampere-turns needed to overcome the armature reluctance are obtained from (43). In order to find the average length, Zft," of path for the lines in the armature, the longest line, FG, and the shortest line. TU, are drawn as indicated by dotted lines in Fig. 25. The average length, VW, is then laid off midway between them. In Fig. 25 the lines FG, TU, and V W are not continuous, because the armature shown to the left, being a toothed armature, has a smaller internal diameter than that on the right, which is a smooth armature. In the present case the right side of Fig. 25 is to be considered only; in speaking of lines FG, TW, and VW, therefore, the left half of the armature is supposed to be symmetrical to the right half, so that the dotted lines in the two halves meet at the center line. By measuring the continuous line VW so obtained, the average length of the path in the armature is found to be about 11 inches. The flux density in the armature core was taken at 80,000 lines per square inch (see page 75); the specific magnetizing force for wrought iron having this density is Ha" = 31 ampere-turns per inch, according to Fig. 27 or to Table 26. Consequently, the armature magnetizing force: at = 31 X 11 = 3Jfi ampere turns. The ampere-turns needed to overcome the field magnd reluctance are calculated by substituting in (43) the respe...


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Product Details
  • ISBN-13: 9781236197061
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1236197062
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr

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