Aircraft Electricity And Electronics – Thomas Eismin

If a source of direct current is connected to two terminals of a stator winding, it will be found that sections of the inte- rior surface of the stator have a definite polarity. If the de con- nections are reversed, the polarity of the stator will also reverse. When an alternating current is applied to the connec- tions of the stator, the polarity of the stator will reverse twice each cycle.

Ordinarily, the stator of an ac motor has two or three separate windings, depending on whether the motor is designed for two-phase or three-phase current. When multi- phase currents are applied to the windings of a stator, a rotat- ing magnetic field is established within the stator (see Figure 9-21). As the current in each phase changes direction and magnitude, the combined field of the stator will rotate at the frequency of the alternating current.

If we study carefully the diagrams and the graph for posi- tion in Figure 9—21, we will find that phase 1 is positive with maximum current and that the stator field is vertical. The cur- rent is negative in both phase 2 and phase 3, with all the cur- rent flowing through the phase-1 winding in both the stator bee ee eee ee eee eee RPewmeenea—-s”ceeeeeecece Rotating field of an ac motor. Chapter 9 Electric Motors ewer ees and the generator. The generator, or alternator, is represented by the inverted Y coils at the bottom of each diagram.

In po- sition | we see that approximately one-half the current flows through phase 2 and the other half through phase 3. This re- sults in the vertical field shown in the diagram. When the current has changed through an angle of 30° to position 2, the current in phase | is still positive but has de- creased, the current in phase 2 is at zero, and the current in phase 3 has increased in the negative direction.

Aircraft Powerplants, Seventh Edition, Kroes/Wild Aircraft Maintenance and Repair, Sixth Edition, Kroes/Watkins/Delp Aircraft Basic Science, Seventh Edition, Kroes/Rardon Aircraft Electricity and Electronics, Fifth Edition, Eismin Aircraft Gas Turbine Engine Technology, Third Edition, Treager GLENCOE Aviation Technology Series 2 Sosa Lee LE — Zo. — : – Fifth Edition Thomas K.

Eismin GLENCOE McGraw-Hill New York, New York Columbus, Ohio Woodland Hills, California Peoria, Illinois Library of Congress Cataloging-in-Publication Data Eismin, Thomas K. Aircraft electricity and electronics / Thomas K. Eismin.—5dth ed. p. cm.—(Aviation technology series) Includes index. ISBN 0-02-801859-1 1. Airplanes—Electric equipment. 2. Airplanes—Electronic equipment. 3. Avionics. |. Title. Il. Series. TL690.E37 1994 629. 135’4—dc20 93-43328 CIP Aircraft Electricity and Electronics, Fifth Edition Imprint 2011 Copyright © 1995, 1989 by Glencoe/McGraw-Hill.

All rights reserved. Copyright © 1989 by James L. McKinley and McGraw-Hill, Inc. All rights reserved. Printed in the United States of America. Except as permitted under the United States Copyright Act, no part of this pub- lication may be reproduced or distributed in any form or by any means, or stored in a data- base or retrieval system, without prior written permission from the publisher.

Copyright © 1981 by James L. McKinley. Copyright © 1961, 1971 as Electricity and Electronics for Aerospace Vehicles by James L. McKinley. ISBN-13: 978-0-02-801859-1 ISBN-10: 0-02-801859-1 Printed in the United States of America. 20 21 22 QDB 141312 Preface ix Acknowledgments =x A Fundamentals of Electricity 1 The Electron Theory 17 Static Electricity 3 Units of Electricity 4 Theory of Magnetism 6 Magnetic Devices 9 Methods of Producing Voltage 17 Electromagnetic Induction 17 Applications of Ohm’sLaw = 73 Ohm’s Law 73 Types of Circuits 16 Solving Series Circuits 17 Solving Parallel Circuits 20 Series-Parallel Circuits 23 Kirchhoff’s Laws 26 Solution of a Resistance Bridge Circuit 27 Practical Applications of Ohm’sLaw 28 Aircraft Storage Batteries 30 Dry Cells and Batteries 30 Lead-Acid Storage Batteries 34 Lead-Acid Battery Maintenance Procedures 39 Battery Ratings 44 Nickel-Cadmium Storage Batteries 46 Nickel-Cadmium Battery Maintenance Procedures Installation of Aircraft Batteries 52 Electric Wire and Wiring Practices 56 Characteristics of Electric Wire 56 Requirements for Open Wiring 62 Electrical Conduit 65 Connecting Devices 66 Bonding and Shielding 77 Wire Identification 78 50 Contents 5.

Alternating Current 82 Definition and Characteristics 82 Impedance 87 Polyphase AC Circuits 92 Alternating Current and the Airplane 93 6. Electrical Control Devices 95 Switches 95 Circuit-Protection Devices 98 Resistors 1700 Capacitors 102 Inductors 106 Transformers 108 Rectifiers 7170 Transistors 775 Other Solid-State Devices 1179 Printed Circuit Boards 122 Cathode-Ray Tube 123 7.

This is a short excerpt from the opening of “” by Unknown, quoted for review and introduction purposes. All rights belong to the copyright holders.

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