Some Commutation Phenomena of Direct Current Machinery (Classic Reprint) download PDF, EPUB, Kindle

Some Commutation Phenomena of Direct Current Machinery (Classic Reprint) download PDF, EPUB, Kindle

Some Commutation Phenomena of Direct Current Machinery (Classic Reprint) by F C Clark

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Author: F C Clark
Number of Pages: 122 pages
Published Date: 27 Sep 2015
Publisher: Forgotten Books
Publication Country: United States
Language: English
ISBN: 9781332197491
Download Link: Some Commutation Phenomena of Direct Current Machinery (Classic Reprint)
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Excerpt from Some Commutation Phenomena of Direct Current Machinery Much attention has been given to the theory of commutation in direct current machinery but few attempts to measure the current flowing in the coil that, during commutation, is short-circuited are on record. An attempt will be made in this paper to throw a little light on the subject of this measurment, and on the factors governing the magnitude and the law of variation of this current under different give conditions. The first, in importance, of these factors is that of contact resistance. By the term contact resistance is understood the resistance of the contact between the surface of the commutator and that of the brush. This contact resistance is the main factor in determining whether or not the current during short-circuit will or will not be excessive in magnitude, and, in general has no bearing on the rate of change of the current. The rate of change or shape of the wave of this current will depend on the self induction of the coil, the frequency of commutation and upon the electromotive forces induced in it at the different stages of commutation. As this wave form is, at present, of secondary importance to the magnitude of the current I will first take up the questions of contact resistance. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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