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The Construction of Dynamos (Alternating and Direct-Current); A Text-Book for Students, Engineer-Constructors, and Electricians-In-Charge

The Construction of Dynamos (Alternating and Direct-Current); A Text-Book for Students, Engineer-Constructors, and Electricians-In-Charge


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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. 1907 Excerpt: ... machines have been made in the past, most manufacturers would now prefer to supply it as a four-pole machine. It is proposed in this chapter, however, to deal with only two-pole machines, leaving considerations of the multipolar type for a subsequent chapter. From the given requirements we have--waits output = 50,000 volts =200 ctirrent = trt = 25 amps. Armature reaction limits the largest-size bipolar armatures to something like 2 feet in diameter, and it may be taken that the smaller the diameter the better. We have also to keep in mind the best proportions of diameter and length for whichever type we propose to use. For this size a ring winding would be unsuitable, and with a drum armature, we have seen that the length of core, in the largest sizes, should be about twice the diameter. The correct proportions may be found by choosing a certain diameter, when a little calculation will show whether the value taken is in reasonably good proportion. The speed will depend on the output of the machine, for the size of the armature depends on the output. The usual speeds for bipolar machines vary between the limits given in the table below: --The speed, however, is often fixed by directly coupling the machine to its engine, in which case it must run at the engine speed. Again, in such special work as turbine driving, the speed often far exceeds the values given in the above table, but in this case a very special construction of both armature and commutator is required. Taking the diameter of the armature then at, say, 15 inches, we get--circumference of armature = 15 X " = 47'i inches If we now decide to make the width of teeth and slots alike at the periphery, we may take, as a first approximation, inch for the width of slots. We then get--wid...


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Product Details
  • ISBN-13: 9781236170033
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 74
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1236170032
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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