Solucionario

Instructor’s Manual

to accompany

Chapman

Electric Machinery Fundamentals
Fourth Edition

Stephen J. Chapman
BAE SYSTEMS Australia

i

Instructor’s Manual to accompany Electric Machinery Fundamentals, Fourth Edition
Copyright  2004 McGraw-Hill, Inc.
All rights reserved. Printed in the United States of America. No part of this book may be used or reproduced in
any mannerwhatsoever without written permission, with the following exception: homework solutions may be
copied for classroom use.
ISBN: ???

ii

TABLE OF CONTENTS

CHAPTER 1:

INTRODUCTION TO MACHINERY PRINCIPLES

CHAPTER 2:

TRANSFORMERS

23

CHAPTER 3:

INTRODUCTION TO POWER ELECTRONICS

63

CHAPTER 4:

AC MACHINERY FUNDAMENTALS

103

CHAPTER 5:

SYNCHRONOUS GENERATORS

109CHAPTER 6:

SYNCHRONOUS MOTORS

149

CHAPTER 7:

INDUCTION MOTORS

171

CHAPTER 8:

DC MACHINERY FUNDAMENTALS

204

CHAPTER 9:

DC MOTORS AND GENERATORS

214

CHAPTER 10:

SINGLE-PHASE AND SPECIAL-PURPOSE MOTORS

1

270

APPENDIX A: REVIEW OF THREE-PHASE CIRCUITS

280

APPENDIX B:

288

COIL PITCH AND DISTRIBUTED WINDINGS

APPENDIX C: SALIENT POLETHEORY OF SYNCHRONOUS MACHINES

295

APPENDIX D: ERRATA FOR ELECTRIC MACHINERY FUNDAMENTALS 4/E

301

iii

PREFACE
TO THE INSTRUCTOR

This Instructor’s Manual is intended to accompany the fourth edition of Electric Machinery Fundamentals. To
make this manual easier to use, it has been made self-contained. Both the original problem statement and the
problem solution are given for eachproblem in the book. This structure should make it easier to copy pages from
the manual for posting after problems have been assigned.
Many of the problems in Chapters 2, 5, 6, and 9 require that a student read one or more values from a
magnetization curve. The required curves are given within the textbook, but they are shown with relatively few
vertical and horizontal lines so that they willnot appear too cluttered. Electronic copies of the corresponding opencircuit characteristics, short-circuit characteristics, and magnetization curves as also supplied with the book. They
are supplied in two forms, as MATLAB MAT-files and as ASCII text files. Students can use these files for
electronic solutions to homework problems. The ASCII files are supplied so that the information can be usedwith
non-MATLAB software.
Please note that the file extent of the magnetization curves and open-circuit characteristics have changed in this
edition. In the Third Edition, I used the file extent *.mag for magnetization curves. Unfortunately, after the book
was published, Microsoft appropriated that extent for a new Access table type in Office 2000. That made it hard
for users to examine andmodify the data in the files. In this edition, all magnetization curves, open-circuit
characteristics, short-circuit characteristics, etc. use the file extent *.dat to avoid this problem.
Each curve is given in ASCII format with comments at the beginning. For example, the magnetization curve in
Figure P9-1 is contained in file p91_mag.dat. Its contents are shown below:
%
%
%
%
%
%
%
%
%%

This is the magnetization curve shown in Figure
P9-1. The first column is the field current in
amps, and the second column is the internal
generated voltage in volts at a speed of 1200 r/min.
To use this file in MATLAB, type "load p91_mag.dat".
The data will be loaded into an N x 2 array named
"p91_mag", with the first column containing If and
the second column containing theopen-circuit voltage.
MATLAB function "interp1" can be used to recover
a value from this curve.
0
0
0.0132
6.67
0.03
13.33
0.033
16
0.067
31.30
0.1
45.46
0.133
60.26
0.167
75.06
0.2
89.74
iv

0.233
0.267
0.3
0.333
0.367
0.4
0.433
0.467
0.5
0.533
0.567
0.6
0.633
0.667
0.7
0.733
0.767
0.8
0.833
0.867
0.9
0.933
0.966
1
1.033
1.067
1.1
1.133
1.167
1.2...