Handbook of Small Electric Motors MAZ Part 1 pptx

HANDBOOK
OF SMALL
ELECTRIC MOTORS
William H. Yeadon, P.E.
Editor in Chief
Alan W. Yeadon, P.E.
Associate Editor
Yeadon Energy Systems, Inc
Yeadon Engineering Services, P.C.
McGraw-Hill
New York Chicago San Francisco Lisbon London
Madrid Mexico City Milan New Delhi
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Sydney Toronto
Library of Congress Cataloging-in-Publication Data
Handbook of small electric motors / William H.Yeadon,
editor in chief, Alan W. Yeadon, associate editor.
p. cm.
ISBN 0-07-072332-X
1. Electric motors, Fractional horsepower. I. Yeadon,
William H. II. Yeadon,Alan W.
TK2537 .H34 2001
621.46—dc21 00-048974
Copyright © 2001 by The McGraw-Hill Companies, Inc. All rights reserved.
Printed in the United States of America. Except as permitted under the
United States Copyright Act of 1976, no part of this publication may be
reproduced or distributed in any form or by any means, or stored in a data
base or retrieval system, without the prior written permission of the pub-
lisher.
1234567890 DOC/DOC 07654321
ISBN 0-07-072332-X

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contact your local bookstore.
This handbook is intended to be used as a reference for information regard-
ing the design and manufacture of electric motors. It is not intended to
encourage or discourage any motor type, design, or process.Some of the con-
figurations or processes described herein may be patented. It is the responsi-
bility of the user of this information to determine if any infringement may
occur as a result thereof.
Information contained in this work has been obtained by The
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understanding that McGraw-Hill and its authors are supplying
information but are not attempting to render engineering or other
professional services. If such services are required, the assistance
of an appropriate professional should be sought.
This handbook is dedicated to my wife, Luci Yeadon, who
took most of the photographs for it.
William H.Yeadon
Editor in Chief

CONTRIBUTORS
Larry C. Anderson American Hoffman Corporation (Sec. 3.14)
John S. Bank Phoenix Electric Manufacturing Company (Sec. 3.15)
Warren C. Brown Link Engineering Company (Sec. 3.10.6)
Joseph H. Bularzik Magnetics International, Inc. (Sec. 2.5)
Peter Caine Oven Systems, Inc. (Sec. 3.16)
David Carpenter Vector Fields, Ltd. (contributed the finite-element plots in Chap. 4)
John Cocco Loctite Corporation (Sec. 3.17)
Philip Dolan Oberg Industries (Sec. 3.10.5)
Birch L. DeVault Cutler-Hammer (Sec. 10.6)
Brad Frustaglio Yeadon Energy Systems, Inc. (Sec. 6.4)
Francis Hanejko Hoeganaes Corporation (Sec. 2.6)
Duane C. Hanselman University of Maine (Secs. 5.1.4 and 10.11)
Daniel P. Heckenkamp Cutler-Hammer (Sec. 10.6)
Leon Jackson LDJ Electronics (Sec. 3.19)
Dan Jones Incremotion Associates (Secs. 5.1.3, 10.12, and 10.13)
Douglas W. Jones University of Iowa (Secs. 5.2.10 and 10.8 to 10.10)
Mark A. Juds Eaton Corporation (Secs. 1.1 to 1.12)
Robert R. Judd Judd Consulting Associates (Secs. 2.2 and 2.3)
Ramani Kalpathi Dana Corporation (Sec. 10.7)
John Kauffman Phelps Dodge Magnet Wire Company (Sec. 2.10)
Todd L. King Eaton Corporation (Sec. 10.6)
H. R. Kokal Magnetics International, Inc. (Sec. 2.5)
Robert F. Krause Magnetics International, Inc. (Sec. 2.5)
Barry Landers Electro-Craft Motion Control (Chap. 9)
Roger O. LaValley Magnetic Instrumentation, Inc. (Sec. 3.18)
Bill Lawrence Oven Systems, Inc. (Sec. 3.16)
Andrew E. Miller Software and motor designer (Secs. 4.5, 6.4.3, and 6.4.4)
Stanley D. Payne Windamatics Systems, Inc. (Sec. 3.10.4)
Derrick Peterman LDJ Electronics (Sec. 3.19)

xi
Curtis Rebizant Integrated Engineering Software (contributed the boundary ele-
ment plots in Figs. 5.58 to 5.61)
Earl F. Richards University of Missouri (Secs. 1.14, 4.1, 6.2, 6.3, and 8.4 to 8.8)
Robert M. Setbacken Renco Encoders, Inc. (Secs. 10.1 to 10.5)
Karl H. Schultz Schultz Associates (Secs. 3.1 to 3.9)
Joseph J. Stupak Jr. Oersted Technology Corporation (Sec. 2.8)
Chris A. Swenski Yeadon Energy Systems, Inc. (Secs. 3.6.5, 6.4, and 7.4)
Harry J. Walters Oberg Industries (Sec. 3.10.5)
Alan W. Yeadon Yeadon Engineering Services, PC (Secs. 3.10, 3.11, and 4.2 to 4.5)
Luci Yeadon Luci’s Photography (contributed most of the photographs in this
handbook)
William H. Yeadon Yeadon Engineering Services, PC (Secs. 1.13, 2.1, 2.9, 2.11, 3.10
to 3.12, 4.3, 4.6 to 4.8, 5.1 to 5.3, 6.1, 6.4, 7.1 to 7.4, and 8.1 to 8.3)
xii CONTRIBUTORS
ACKNOWLEDGMENTS
Over the course of my career I have had the privilege to meet many of the giants of
this industry. Many I have met through my association with the Small Motors and
Motion Association (SMMA) and others through business relationships. Included
among them are Dr. Cyril G. Veinott, Professor Philip H. Trickey, Dr. Ben Kuo, Dr.
Duane Hanselman, and those authors who have contributed to this handbook.
There is, however, one person of whom I must make special mention. He is Dr.
Earl Richards, Professor Emeritus of the University of Missouri at Rolla. This man
never ceases to amaze me. He is always willing to help out selflessly with projects of
this type. I have taught many motor design courses with him. When a student asks
questions of him, he can start at the lowest level of understanding necessary and
develop in a very understandable way a logical and reasonable answer to the ques-
tion. His ability to communicate and teach is truly amazing. He has been very help-
ful in the preparation of this book.
I also need to acknowledge the dedication of my secretary, Kristina Wodzinski.

Without her tireless effort this work would not have been completed.
xv
ABOUT THE CONTRIBUTORS
LARRY
C.ANDERSON (Sec. 3.14) is an applications consultant with American Hofmann Corpo-
ration, one of the world’s leading manufacturers of precision balancing machines. He has been
with the company since 1990 and performs unbalance analysis on rotating assemblies for man-
ufacturers worldwide. He holds a BS degree in electrical engineering technology and has over
20 years experience, with the past 8 focused on the electric motor industry.
J
OHN S. BANK (Sec. 3.15) is the executive vice president of Phoenix Electric Manufacturing
Company and is responsible for coordinating new product development and developing
advanced strategies. He received his bachelor’s degree in business administration (magna cum
laude) from the University of Michigan in 1981 and his JD from UCLA in 1984. He is also a
Certified Public Accountant in the state of Illinois (1981) and a licensed real estate broker in
the state of Illinois (1981). Mr. Bank currently serves on the board of directors of SMMA
(1995–present) and EMERF (1997–present). He is the Company Representative and Voting
Member of NEMA (1992–present), EMCWA (1992–present) and NAM (1992–present).
WARREN C. BROWN (Sec. 3.10.6) graduated with a BSME from Michigan State University in
1966 and with an MBA from Michigan State University in 1968. He was the Manager/Director
MIS of Burroughs Corporation in Detroit, Michigan, from 1968 to 1982. He directed sales and
marketing at Link Engineering Company from 1982 to 1990. Since 1990,he has been vice pres-
ident for motor products of Link Engineering Company. He has been a member of SAE,ESD,
and SMMA.
J
OSEPH H. B
ULARZIK (Sec. 2.5) is a staff engineer. He received a BS in chemistry from Arizona
State University,Tempe, in 1982. He received a PhD in chemistry from the University of Cali-
fornia, Berkeley, in 1987. He conducted postdoctoral research in the field of superconducting
oxides at Princeton University, Princeton,New Jersey, in 1989. He was an assistant professor of

chemistry at Lycoming College, Williamsport, Pennsylvania, from 1987 to 1989. He has seven
years of experience in magnetic materials research. He is a member of ASM. He has worked in
research for Magnets International, Inc., East Chicago, Indiana, since 1994, and he worked in
research at Inland Steel Company, East Chicago, Indiana, from 1990 to 1994.
P
ETER CAINE (Sec. 3.16) graduated from the University of Wisconsin in Platteville with a BS in
industrial engineering. His career at Oven Systems,Inc., has included applications engineering,
custom product sales, and management. For the past three years, he has managed the electric
motor equipment division.
DAVID CARPENTER (Chap. 4 finite-element plots) received a first-class honors BSc in electri-
cal engineering from the University of Southampton, England, in 1979 and joined GEC Ltd.
as an induction motor design engineer. In 1986 to 1987 he was appointed as visiting professor
at Lakehead University, Canada, and in the following year he received an MSc from Coven-
try University, England.After joining Vector Fields Ltd. as an application engineer in 1991, he
received a PhD from the University of Bath, England, in 1993. He was appointed to the posi-
tion of vice president of Vector Fields, Inc., United States, in 1995. He is a Charter Engineer
and a member of the IEEE.
JOHN COCCO (Sec. 3.17) is the director of Loctite Corporation’s North American Application
Engineering Center.For the past 10 years, he has been working with Loctite Corporation’s cus-
C.1
tomer base, developing adhesive and sealant applications for use in small motors. In the past
two years, he has conducted several design seminars at original equipment manufacturers
focusing on this topic. He holds a bachelor’s degree in chemical engineering and is a licensed
Professional Engineer.
PHILIP DOLAN (Sec. 3.10.5) graduated from Marquette University with a BA.He was vice pres-
ident of Marketing for Oberg Industries and had previous experience in plant management
and strategic planning.
BIRCH L. DE
VAULT
(Sec.10.6) was born in Pittsburgh, Pennsylvania,in 1946. He received a BS

in electrical engineering from the University of Pittsburgh in 1967. He joined the Westing-
house Electrical Graduate Student Course in 1967. In 1968, he joined the Westinghouse Stan-
dard Control Division, Beaver, Pennsylvania, as an associate design engineer. In 1981, he
joined the Control Division in Asheville, North Carolina.Since February of 1994, he has been
a senior development engineer with Cutler-Hammer, Milwaukee, Wisconsin, responsible for
the design and application of magnetic motor control. He is a Registered Professional Engi-
neer in the state of Pennsylvania. He has eight patents in the area of motor control. He is a
member of IEEE. He has published papers related to motor control in TAPPI and IEEE pub-
lications.
B
RAD
FRUSTAGLIO
(Sec. 6.4) has a BSME from Michigan Technological University and is a
design engineer for Yeadon Energy Systems, Inc.
F
RANCIS
HANEJKO
(Sec. 2.6) is a metallurgical engineer and received his BS and MS degrees
from Drexel University. He has been employed by the Hoeganaes Corporation for 22 of the
last 25 years. During that time, he has held numerous positions in the sales and marketing and
research and development departments. His current position is manager of electromagnetics
and customer applications in the research and development department, with responsibilities
for customer service and product development. He is a past chairman of the Philadelphia Sec-
tion of the APMI.
D
UANE
C. H
ANSELMAN (Secs.5.1.4 and 10.11) is an associate professor in electrical engineering
at the University of Maine. He holds PhD and MS degrees from the University of Illinois. He
is a senior member of IEEE and an associate editor of the IEEE Transactions of Industrial

Electronics. He is the author of numerous articles on motors and motion control. He has pub-
lished several textbooks, including Brushless Permanent-Magnet Motor Design and MATLAB
Tools for Control System Analysis and Design (McGraw-Hill, 1994).
D
ANIEL
P. H ECKENKAMP (Sec. 10.6) received his BS in mechanical engineering from the Uni-
versity of Wisconsin, Milwaukee, in 1983. In 1981, he joined the Square D Company in Mil-
waukee, where he was responsible for the design of industrial lifting magnets and their
applications. In 1983, he transferred to the Square D Controls Division, where he was respon-
sible for contactor development. He joined Cutler-Hammer’s controls division in 1988 as a
product development engineer, where he has been responsible for the design and maintenance
of contactors and overload relays. His current position is principal engineer.
L
EON JACKSON (Sec. 3.19) received an AS from Port Huron Junior College in 1957. He also
received a BS in electrical engineering from Wayne State University in 1960. He also attended
the University of Loyola for business administration. He received honors from the Tau Betta
Pi educational honor society and the Etta Kappa Nu engineering honor society for academic
achievement. He has worked for General Magnetic Corporation and LDJ Electronics, Inc.,
where he is currently president. He is a member of the IEEE Magnetics Society.
DAN JONES (Secs. 5.1.3, 10.12, and 10.13) has a BSEE from Hofstra University and a MS in
mathematics from Adelphi University. He is a member of ASME, IEEE, ISA, and AIME. He
has 38 years experience in the motor business. He founded Incremotion Associates in 1982 and
has previously worked for such companies as Vernitron, Printed Motors, Inc., Singer-Kearfott,
Electro-Craft Corporation, Data Products Corporation and IMC Magnets Corporation.
C.2
ABOUT THE CONTRIBUTORS
DOUGLAS W. JONES (Secs. 5.2.10 and 10.8 to 10.10) is an associate professor of computer sci-
ence at the University of Iowa. He received his PhD in computer science from the University
of Illinois, Urbana, in 1980. He completed his BS in physics at Carnegie-Mellon University in
1973. His research interests are discrete event simulation, resource protection in architecture,

operating systems, system Programming Languages, and the history of computing.
MARK A. J
UDS (Secs. 1.1 to 1.12) has BS and MS degrees in mechanical engineering from the
University of Wisconsin. He is currently a senior principal engineer for Eaton Corporation’s
Innovations Center, where he designs electromagnetic devices. He also has expertise in heat
transfer and mechanical dynamics.
R
OBERT R. J
UDD (Secs.2.2 and 2.3) is currently president of Judd Consulting Associates, Inc., a
general ferrous metallurgy and electrical-sheet consulting firm. He acquired his doctorate in
materials science from Carnegie-Mellon University and holds a bachelor’s degree in mechani-
cal engineering from the University of Rochester. He spent 30 years in principal research posi-
tions for U.S. Steel and Ispat-Inland. For three years he served as director of research and
development for Johnstown Corporation, a large ferrous foundry and fabrication firm. He has
also taught general metallurgy at Carnegie-Mellon University. His professional activities
include ASM, AIME, MPIF and the ASTM A-6 subcommittee on magnetics. He is also the
treasurer and organizing committee member of the annual Conference on the Properties and
Application of Magnetic Materials. He holds patents in the powder metallurgy and soft mag-
netic material fields.
R
AMANI KALPATHI (Sec. 10.7) was a senior project engineer with Dana Corporation. He com-
pleted his PhD in electrical engineering at Texas A&M University in 1994 and has been with
Dana for the past five years. Recently he has returned home to start his own consulting firm in
Madras, India. His interests are in the areas of power electronics and control of switched-
reluctance motors.
JOHN KAUFFMAN (Sec. 2.10) graduated from Purdue University with a BA in industrial eco-
nomics in 1963. He has worked for Phelps Dodge Magnet Wire Company for 35 years. He holds
four patents for magnet wire and cable products and equipment.
TODD L. KING (Sec. 10.6) received BS and MS degrees in electrical engineering from the Uni-
versity of Wisconsin-Madison in 1978 and 1980,respectively.He joined Borg Warner Corporate

Research Center,Des Plaines, Illinois,in 1980, where he worked in analysis of motors and actu-
ators and the design of automotive controls, actuators, and sensors.He joined Eaton Corporate
Research and Development Center, Milwaukee, Wisconsin, in 1988 as a senior engineer spe-
cialist, where he worked in the design of actuators for appliance, automotive, aerospace,
hydraulic, and truck products. He also worked in the design and analysis of commercial and
industrial motor controls. He became the engineering manager for the Design Analysis Tech-
nology Group in 1990 and added systems technology in the Eaton Innovation Center,where he
has responsibility for defining the strategic direction of systems technology for the corporation.
HAROLD R. KOKAL (Sec. 2.5) is a senior staff engineer. He received his BS and MS degrees in
metallurgical engineering from the University of Minnesota, Minneapolis, in 1964 and 1970,
respectively. He has 30 years experience in process and product research. He is a member of
APMI and AIME. He has worked in research at Magnetics International, Inc., East Chicago,
Indiana, since 1992. He worked in research at Inland Steel Company, East Chicago, Indiana,
from 1985 to 1992, and at U.S. Steel Corporation, Coleraine, Minnesota, and Monroeville,
Pennsylvania, from 1968 to 1985.He was an MRRC Research Fellow at the University of Min-
nesota, Minneapolis, from 1965 to 1966.
ROBERT F. KRAUSE (Sec. 2.5) is a technical director. He received his BS and PhD degrees in
material science from Notre Dame University, South Bend, Indiana, in 1962 and 1966, respec-
tively. He has 31 years experience in metallurgy and magnetic materials.He is a member of the
ASM and IEEE. He has worked in research at Magnetics International, Inc., Burns Harbor,
Indiana, since 1991. He worked in research at Inland Steel Company, East Chicago, Indiana,
ABOUT THE CONTRIBUTORS C.3
from 1987 to 1991; at Crucible Steel Company, Pittsburgh, Pennsylvania, from 1986 to 1987; at
Westinghouse Electric Corporation, Churchill, Pennsylvania, from 1972 to 1986; and at U.S.
Steel Corporation, Monroeville, Pennsylvania, from 1966 to 1972.
BARRY L
ANDERS (Chap. 9) has 24 years of experience in the design and testing of ac and dc
motors, including writing electrical and mechanical design and testing software for fractional-
horsepower ac, brush DC, and brushless dc motors, as well as for fine-pitch custom gearing. In
addition, he has 17 years of experience in spectral analysis of sound, vibration, and current on

these motor types and on ball bearings as received, as well as in failure analysis of field prob-
lems. As a senior project engineer and registered Professional Engineer, he currently has
responsibility for an engineering development, analysis, and test group for ac and dc products
at Electro-Craft Motion Control, Gallipolis, Ohio (a Rockwell Automation business).
R
OGER O. LAVALLEY (Sec. 3.18) is a senior application engineer with Magnetic Instrumenta-
tion, Inc. He has 25 years experience in the area of magnetic applications. In his present posi-
tion he is responsible for reviewing customer requirements for the magnetizing,
demagnetizing, and measuring of permanent magnets and magnet assemblies and for propos-
ing the appropriate equipment and complete systems.
BILL LAWRENCE (Sec. 3.16) has a BSME and an MBA from Marquette University. He has
worked in sales of servo electric motors at Moog, Inc., and in sales of specialty motors at Doerr
Electric. He is currently the vice president of Oven Systems, Inc.
ANDREW E. MILLER (Secs. 4.5, 6.4.3, and 6.4.4) has a BS in chemical engineering from Michi-
gan Technological University. He has several years of experience in software design and three
years of experience in the motor design industry.
STANELY D. PAYNE (Sec. 3.10.4) is the vice president engineer at Windamatics Systems, Inc.,
Fort Wayne, Indiana.
DERRICK PETERMAN (Sec. 3.19) has over eight years experience with magnetics research and
instrumentation. He completed a BA in physics at Washington University, St. Louis, Missouri,
in 1989 and a PhD in physics at Ohio State University in 1996. He currently holds the position
of magnetic measurement specialist at LDJ Electronics.
CURTIS REBIZANT (Figs. 5.58 to 5.61 boundary element plots) is an engineer at Integrated Engi-
neering Software, which produces and markets software for electromagnetic, thermal, and
structural system simulation. He has a BS in electrical engineering from the University of Man-
itoba and has extensive experience with electromagnetic CAE software.
EARL F. RICHARDS (Secs. 1.14, 4.1, 6.2, 6.3, and 8.4 to 8.8) is Professor Emeritus of Electrical
Engineering in the School of Engineering, University of Missouri, Rolla. He received his PhD
from the University of Missouri. He has 16 years of field experience in motor design and over
36 years of experience in the instruction of motor technology. His professional emphasis is on

electromechanical, power, and control systems. He currently instructs graduate-level engineer-
ing courses and is frequently sought as an industrial and legal consultant.
ROBERT M. SETBACKEN (Secs. 10.1 to 10.5) is vice president of engineering at Renco Encoders,
Inc. He received his MSME degree in 1979. He has developed and tested analog and digital
electromechanical and hydraulic servosystems for the military and commercial interests. Since
joining Renco in 1990, he has been involved with the design and manufacture of incremental
rotary optical encoders for the industrial and office automation industries.
KARL H. SCHULTZ (Secs. 3.1 to 3.9) holds a BSME from Western Michigan University. He is a
senior member of SME and a member of SMMA. He has 25 years experience in manufactur-
ing and management with such companies as General Signal, General Electric, Emerson Elec-
tric, Clark Equipment, Chrysler, and Cincinnati Milacron, and his own consulting firm.
C.4
ABOUT THE CONTRIBUTORS
JOSEPH J. STUPAK JR. (Sec. 2.8) received BSME and MSME degrees from the California Insti-
tute of Technology, Pasadena, California, in 1965 and 1969, respectively. He is a licensed Pro-
fessional Engineer in the state of California, in the field of control. He has been a senior
engineer; chief scientist with Synektron Corporation, a manufacturer of brushless dc motors;
and a professor at California Polytechnic Institute. He worked as an independent consultant in
the fields of magnetics and electromagnetics for 10 years, and included the U.S. Naval Under-
sea Warfare Center, Newport, Rhode Island, among his major clients. He is now the president
of Oersted Technology Corporation, Portland, Oregon, a manufacturer of magnetizing equip-
ment and instruments for the magnetics industry.He has 16 issued patents, with 3 more applied
for, and has published 20 papers.He speaks Danish and German, as well as native U.S. English.
He is a member of the IEEE. He is an amateur magician and is a licensed commercial pilot
with instrument rating.
CHRIS A.SWENSKI (Secs. 3.6.5, 6.4,and 7.4) is an engineering technician for Yeadon Energy Sys-
tems, Inc.
HARRY J. WALTERS (Sec. 3.10.5) is a graduate of the Johns Hopkins University in mechanical
engineering. He has patents in press transfers, stamping die mechanisms, and die sensing. He
has a background in plastics extrusion and injection molding, stamping die and mold design,

automation, and machine design. He is currently employed by Oberg Industries.
ALAN W. Y EADON, P.E. (Secs. 3.10, 3.11,and 4.2 to 4.5) is vice president of Yeadon Engineering
Services, PC, and Yeadon Energy Systems Inc. He holds a BSEE degree from the University of
Illinois. He has 12 years experience in product design, consulting for the motor industry, and
development of software for electric motor design and analysis.
LUCI YEADON is the owner of Luci’s Photography,Stambaugh, Michigan.She contributed most
of the photographs for the book.
WILLIAM H. YEADON, P.E. (Secs. 1.13, 2.1, 2.9, 2.11, 3.10 to 3.12, 4.3, 4.6 to 4.8, 5.1 to 5.3, 6.1, 6.4,
7.1 to 7.4, and 8.1 to 8.3) is president of Yeadon Engineering Services, PC, and Yeadon Energy
Systems, Inc. He is a graduate of the University of Dayton and has 33 years experience in the
motor industry. He has expertise in the areas of design and development, production, quality
control, and management.He has worked for such companies as Redmond Motors,A. O. Smith,
Warner Electric, and Barber Colman. He is an instructor with the SMMA Motor College.
ABOUT THE CONTRIBUTORS C.5
ABOUT THE EDITORS
WILLIAM H. YEADON, P.E. is the president of Yeadon Engineering Services, PC, and
Yeadon Energy Systems, Inc. He helped to establish the motor college for the Small
Motor and Motion Association (SMMA). He is a member of SMMA, Electrical
Manufacturing and Coil Winding Association (EMCWA), National Society of Pro-
fessional Engineers (NSPE), and the Institute of Electrical and Electronics Engi-
neers, Inc. (IEEE). He currently writes and teaches courses for the SMMA and
EMCWA, designs motors, and is a consultant. He has more than 30 years of experi-
ence in electric motors, holding positions in design and development, management,
production, and quality control with companies that include Redmond Motors,A. O.
Smith,Warner Electric, and the motor division of Barber-Colman Company. He has
design and development experience in electric motors and generators including ac
induction motors, dc permanent-magnet and wound-field motors, and electronically
commutated, brushless dc, stepper, and switched-reluctance motors. He has done
failure analysis and served as a manufacturing and cost-reduction consultant. He
also has served as an expert witness. He is a graduate of the University of Dayton

and is a registered professional engineer in Michigan, Ohio, Illinois, and Wisconsin.
ALAN W. Y EADON, P.E. holds a BSEE degree from the University of Illinois. He
assisted in the establishment of the SMMA motor college and has taught PMDC
motor design classes. He has design experience in ac induction motors,dc permanent-
magnet and wound-field motors, electronically commutated bushless dc, and
switched-reluctance motors. He has 12 years experience in product design, consult-
ing, and development of software for electric motor of design and analysis. He is a
registered professional engineer in Michigan and Illinois.