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A Treatise on the Elements of Electrical Engineering Volume 1; A Text Book for Colleges and Technical Schools

A Treatise on the Elements of Electrical Engineering Volume 1; A Text Book for Colleges and Technical Schools


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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. 1917 Excerpt: ...in a short-circuited section will be greater and greater, so that it is possible to adjust the forward lead of the brush so as to obtain the desired sparkless reversal. (b) The use of high-resistance brushes of carbon tends not only to cause a decrease to zero of the current in a newly shortcircuited armature section, but also to establish the desired reversed current. The decrease of the initial current to zero is mainly due to the high resistance of brush contacts and of brush material which form part of the short-circuit; but as the commutator moves beyond the position shown in Fig. 196, the contact resistance between the brush and bar e increases greatly due to decreasing area of contact, and this increasing resistance tends to divert the current i through the section V before the contact between brush and bar e is actually broken. It is impracticable to depend solely upon the action described under (a) for the elimination of sparking, because to do so would require the lead of the brushes to be readjusted with every change of load. Therefore, unless commutating poles are used as explained in Art. 136, the action described under (b) must be depended upon. Indeed the sparkless operation of most direct-current motors and generators depends upon the use of carbon brushes. 136. The use of commutating poles. The interpole motor.--The most satisfactory arrangement for producing sparkless reversal of current in the sections of the armature winding at commutation is illustrated in Fig. 197a. So-called commutating poles or interpoles, nsns, are placed midway between the field magnet poles, NSNS, these commutating poles are excited (magnetized) by windings through which the whole or a definite fraction of the armature current flows. The magnetic field F which is ...


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Product Details
  • ISBN-13: 9781130155846
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 118
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130155846
  • Publisher Date: 06 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 227 gr


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A Treatise on the Elements of Electrical Engineering Volume 1; A Text Book for Colleges and Technical Schools
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