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Transactions of the American Institute of Electrical Engineers Volume 26, PT. 2 download book

Transactions of the American Institute of Electrical Engineers Volume 26, PT. 2 download book

Transactions of the American Institute of Electrical Engineers Volume 26, PT. 2. American Institute of Engineers

Transactions of the American Institute of Electrical Engineers Volume 26, PT. 2
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Author: American Institute of Engineers
Number of Pages: 266 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130565249
File size: 43 Mb
File Name: Transactions.of.the.American.Institute.of.Electrical.Engineers.Volume.26,.PT..2.pdf
Download Link: Transactions of the American Institute of Electrical Engineers Volume 26, PT. 2
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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: ...main flux from the pole-tip, we would annul this troublesome cause of sparking. After the above two effects are taken care of, there remains a force necessary to produce a potential sufficient to reverse the current in the armature coil. In order to produce this potential there must be such a density of flux as will generate this required voltage by the conductors cutting the flux in revolving. The width of such magnetic density should be sufficient to embrace the conductors commutated by the brush when running in either direction of rotation. The commutating voltage produced by the flux of the commutating pole is the accelerating force required to change the direction of current in the armature coils one by one as they come under the bmsh. It must be sufficient to accomplish this in the time that the coil, being connected to two adjacent commutator-bars, is under the brush. When the commutatorbar leaves the brush, the current is already reversed, flowing in proper direction, and is of the proper amount, so there is no tendency to spark. Commutation may then be said to be perfect. As stated before, an armature coil imbedded in iron is surrounded by a leakage flux, which is caused by the current in the coil, and may be said to have magnetic inertia or momentum. This is similar in mechanics to a revolving shaft bearing a mounted flywheel. The voltage induced in the coil by the flux from the commutating pole may be likened to a constant counter torque; this counter torque serving to slow down the revolutions, stop, and cause an increase in speed in the opposite direction. It is evident that there may be a particular armature current, speed of motor, and flux from commutating pole wherein the above described conditions will obtain. It will also be appreciated t...

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