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Principles of Direct-Current Electrical Engineering

Principles of Direct-Current Electrical Engineering


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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: ...inductor. This is because the core must be insulated from the full F1g. 155.--Loop for bar-wound armature. voltage of the machine, while the voltage between any one inductor and its neighbour is only a small fract1on 01 the full voltage. Press-spahn and micanite are the insulators generally used, and the former requires to be specially treated to render it moisture-proof. These materials can be obtained in almost any thickness, but it is preferable to use two or three layers of thin material in making up the slot lining to the required thickness. Thus suppose a slot requires to be lined with press-spahn to a thickness F1g. 156.--Loop for bar-wound armature. of 0.75 millimetre, then three layers, each 0.25 millimetre thick, would be used, as it is more flexible and has a somewhat higher disruptive strength than single sheets of equivalent thickness. Figures 157 and 158 illustrate two methods, according to the cross-section of the inductors, of insulating the slots. The sectional area of copper only forms a portion of the total sectional area of a slot, and the ratio of the former to the latter is known as the space factor. The higher the voltage generated the lower the space factor, and in present-day machines it ranges from 0.5 or 0.4 in 550-volt generators to 0.6 or 0.7 in 230-volt and 100volt generators. Methods of Retaining the Inductors against Centri fugal Force: (1) Low and Medium Speed Machines.--When the winding of an armature has been completed several bands of binding wire require to be wound circumferentially round it to hold the inductors securely in place. The tendency for them to fly out of the slots, due to the action of centrifugal force, is thus counteracted. Non-magnetic steel wire of Nos. 18 to 22 S.W.G. and well tinned, is the material g...


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Product Details
  • ISBN-13: 9781130281057
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 142
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1130281051
  • Publisher Date: 06 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr


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