Direct Current Generators
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Direct Current Generators
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Author : A. Bhatia
language : en
Publisher: CreateSpace
Release Date : 2015-02-21
Direct Current Generators written by A. Bhatia and has been published by CreateSpace this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-02-21 with Technology & Engineering categories.
A direct current generator, or DC generator, produces a voltage of constant polarity, which means the voltage and current do not change over time. DC generators are basically AC generators whose output voltage is switched the other way round at the proper moment, so that the direction of the voltage is always in a single direction. The AC generator uses slip rings to transfer the current to the electrical circuit, while the DC generator uses a split-ring commutator. Generators can be very small or quite huge. Commercial DC generators are commonly found in traction applications like subways and trains. Factories that do electrolysis, electroplating and those that produce aluminum, caustic soda, chlorine, and some other industrial materials need large amounts of direct current and use DC generators.An electric motor is very similar to a generator, except that power is provided to turn the rotors. They may, in fact, be described as generators "running backwards". When current is passed through the armature of a DC motor, a torque is generated by magnetic reaction, and the armature revolves. Adjustable speed is difficult to obtain with motors whose armatures are connected to fixed frequency power lines (AC motors). Here is where DC motors shine; their rotating field speed depends on the rotor speed itself. The speed of DC series motors varies with load, and torque varies inversely with speed. This makes them particularly suitable to starting high inertia loads such as railway trains. Starting a DC motor requires often an external resistor or rheostat to limit the current. The value, in Ohms, of that resistor is reduced in steps as the speed of the motor increases, until finally that resistor is removed from the circuit as the motor reaches close to its final speed.This 4-hr Quick Book provides discusses salient features of DC motors and generators in detail. The course is based entirely on Naval Education and Training Materials (NAVEDTRA 14177), Electricity and Electronic Training Series; Module-5 and covers Chapter 1 and 2 titled “Direct Current Generators and Direct Current Motors”. Learning ObjectiveAt the conclusion of this course, the reader will be able to:• State the principle by which generators convert mechanical energy to electrical energy.• State the rule to be applied when you determine the direction of induced emf in a coil.• State what component causes a generator to produce direct current rather than alternating current.• State how field strength can be varied in a dc generator.• State the three classifications of dc generators.• State the term that applies to voltage variation from no-load to full-load conditions and how it is expressed as a percentage.• State the factors that determine the direction of rotation in a dc motor.• State the right-hand rule for motors.• Describe the main differences and similarities between a dc generator and a dc motor.• List the advantages and disadvantages of the different types of dc motors.• Discuss the means of controlling the speed and direction of a dc motor.• Explain the need for a starting resistor in a dc motor.
Electricity Magnetism
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Author : International Correspondence Schools
language : en
Publisher:
Release Date : 1914
Electricity Magnetism written by International Correspondence Schools and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1914 with Electrical engineering categories.
Direct Current Machines
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Author : R.K. Rajput
language : en
Publisher: Laxmi Publications
Release Date : 2007
Direct Current Machines written by R.K. Rajput and has been published by Laxmi Publications this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Direct Current Machinery
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Author : Harold Pender
language : en
Publisher:
Release Date : 1922
Direct Current Machinery written by Harold Pender and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1922 with Electric machinery categories.
Direct Current Machinery
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Author : David Penn Moreton
language : en
Publisher:
Release Date : 1924
Direct Current Machinery written by David Penn Moreton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1924 with Electric machinery categories.
American Standard Direct Current Generators Direct Current Motors And Direct Current Commutating Machines In General
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Author : American Standards Association
language : en
Publisher:
Release Date : 1965
American Standard Direct Current Generators Direct Current Motors And Direct Current Commutating Machines In General written by American Standards Association and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Electric generators categories.
Direct Current Generators
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Author : Bergwall Productions Inc.
language : en
Publisher: Delmar Pub
Release Date : 1992-01-01
Direct Current Generators written by Bergwall Productions Inc. and has been published by Delmar Pub this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992-01-01 with Technology & Engineering categories.
This series explains the basic concept of simple DC generators and describes the function of generator components. It explains how to calculate generator EMF and saturation curves, and discusses power losses and equations for machine efficiency. This series also describes the major types of DC generators, separately excited generators, and three types of self-excited generators.
Direct Current Machinery
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Author : Harold Pender
language : en
Publisher: Forgotten Books
Release Date : 2015-06-25
Direct Current Machinery written by Harold Pender and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-25 with Technology & Engineering categories.
Excerpt from Direct-Current Machinery: A Text-Book on the Theory and Performance of Generators and Motors The author knows of no text-book on direct-current machinery which gives a thorough treatment of the theory and performance of such machines, without at the same time going into the details of design to such an extent as to be confusing to the mind of the ordinary undergraduate student. It is with the desire to provide such a text that this book is offered to the teachers and students of Electrical Engineering. In the author's opinion, a course in the design of electric machinery is out of place in the undergraduate curriculum. A student of electrical engineering should, however, acquire a thorough knowledge of the theory of such machines and of the basic principles upon which their design depends. Only to this extent, therefore, is the matter of design gone into in this book. Those interested in the details of design are referred to such books as Arnold's Die Gleichstrommaschine or Langsdorf's Principles of Direct-current Machines. Although but few graduates in electrical engineering ever have occasion to design a generator or a motor, the majority of them, at some time in their careers, will be called upon to operate or test such machines, or to pass upon their suitability for a particular service. The greater part of this book is therefore devoted to the performance, application, and testing of the various types of direct-current generators and motors. The graphical method, given in Chapters VI and VII, for determining the performance characteristics of generators and motors, was developed by the author several years ago, with the assistance of Mr. H. R. West. This method, although in its simple form only approximate, brings out in a readily understood manner, the dependence of the performance of the machine upon the nature of its electric and magnetic circuits. In the chapter on Commutation the attempt has been made to treat this subject in an understandable, and yet rigorous, manner. 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.
Armature Windings Of Direct Current Dynamos
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Author : Engelbert Arnold
language : en
Publisher:
Release Date : 1902
Armature Windings Of Direct Current Dynamos written by Engelbert Arnold and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1902 with Armatures categories.
Electricity And Magnetism
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Author : Anonymous
language : en
Publisher: Franklin Classics Trade Press
Release Date : 2018-10-27
Electricity And Magnetism written by Anonymous and has been published by Franklin Classics Trade Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-27 with categories.
This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.