Modern Steam Practice Engineering And Electricity

Author : Frank Wakeley Gunsaulus
Publisher : Forgotten Books
ISBN 13 : 9781391652467
Total Pages : 476 pages
Book Rating : 4.6/5 (524 download)

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Download or read book Modern Engineering Practice, Vol. 8 of 10 written by Frank Wakeley Gunsaulus and published by Forgotten Books. This book was released on 2018-10-03 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Modern Engineering Practice, Vol. 8 of 10: Steam, Electricity, Mechanics; A Reliable Guide for Engineers, Mechanics and Machinists and Students; Illustrating and Explaining the Theory, Design, Construction and Operation of All Kinds of Machinery; Electricity-Light-Power The change from belt-driven to direct-driven generators has been very gradual. In 1893 several of the larger companies had constructed direct-driven generators of large size, and this date may be fixed as about the beginning of the present era of direct driven generators. Advantages of direct-driven Generator. In all applica tions of very large generators, where it is possible to do so, it is better to install one of the direct-driven types, as even the best system of belting is unsatisfactory for transmitting great power. Moreover, the introduction of shafting, counter shafting and belt, rope or wire driving, causes losses by friction, which are some times excessive when large generators have to be driven. These losses are avoided by the use of direct-driven generators. Also high-speed belt-driven generators necessarily have armatures of small diameter, since larger diameters would not be suitable for driving at very high rates of revolution. Armatures of small diameter, however, in which the windings are compactly placed, are very imperfectly ventilated, and often give a great deal of trouble by overheating. Faulty insulation and poor efficiency are the result. The direct-driven generator, on the other hand, Operating at slow speed, has an armature of much larger diameter, so that the windings are spread out over a much greater surface. This gives facilities for practically perfect ventilation. As a rule the direct driven generators keep cool much better than the belt-driven type, and will stand far greater overloads. Another point of great importance in determining the type of generator to be installed is the ease with which repairs can be made. In the older belt-driven armatures the coils are compactly wound and bound about by insulation; the burning out of a coil usually makes it necessary to take the armature to pieces for re pairs. In the modern direct-driven armature the coils are spread out over a large surface, and are well separated from each other. Repairs are, therefore, made with the utmost facility. Any individual coil may be separately removed. Such repairs. 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.