Includes bibliographical references and index. ISBN 1. Electric motors, Permanent magnet-Design and construction. Electric motors, Brushless-Design and construction.

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Includes bibliographical references and index. ISBN 1. Electric motors, Permanent magnet-Design and construction. Electric motors, Brushless-Design and construction. H36 All rights reserved. No part of this book may be reproduced in any form or by any means including information storage and retrieval systems without permission in writing from the author and publisher.

Information contained in this book is believed to be reliable. However, neither the publisher nor the author guarantee the accuracy or completeness of any information published herein. The publisher and the author shall not be liable for any errors, omissions, or damages arising out of use of this information. This work is published with the understanding that the publisher and author are supplying information but are not attempting to render professional services.

I am indebted to my wife Pamela and our children Ruth, Sarah, and Kevin. The seemingly countless hours I spent on this project were hours that I did not spend with you. I acknowledge the companies for which I have provided consulting services.

The breadth of knowledge and insight gained as a result of this work has made this text possible. Your friendship and shared expertise over the years are deeply appreciated. I am deeply grateful for the contributions of Earl Richards. Your meticulous proofreading has improved this text immeasurably.

Thank you for your many long hours of dedicated work. You are a kind and generous person. Your technical comments and proofreading skills have contributed to the professionalism of this text. I am indebted to Mike Keshura and John Raposa for getting me started in this area of work.

Years ago you gave a fresh Ph. Who knows what I would be doing right now if it weren't for you. Duane Hanselman is an electrical engineering professor at the University of Maine. He holds a Ph. He has written numerous texts, and technical articles. Many of these are in the area of brushless permanent magnet motors and their controls.

In addition to his teaching duties and writing, Duane actively consults in the area of magnetics and brushless permanent magnet motors. He has provided services to dozens of companies and has served as an expert witness in patent infringement lawsuits.

End Turn Inductance 4. Motor Constant Maximization 9. This second edition follows the same philosophy as the first edition. That is, the goal of this text is to start with basic concepts, provide intuitive reasoning for them, and gradually build a set of understandable concepts for the design of brushless permanent magnet motors.

This text does not assume that you know all the jargon of motor design before reading this book, but rather introduces and explains them so that this and other books make sense.

The first three chapters of this edition closely follow those of the first edition. This basic materia] forms the foundation for the more detailed concepts that follow it.

The remaining chapters contain all new material. While the material in the remaining chapters of the first edition was informative and provided simple tools for motor design, it was not very useful for rigorous motor design. Chapter 4 of this edition covers the same material as that in the first edition, but does so with much greater depth.

All of the new chapters reflect knowledge gained and details worked out since publication of the first edition. Despite their rigor, the new material continues to follow the keep-it-simple philosophy adopted by the first edition. Because motor design is not a hot discipline where fortunes are made or lost overnight, traditional publishers were not interested in publishing this text. As a result, 1 engaged in this project alone. I purchased desktop publishing software, equation composition software, illustration software, and a Postscript laser printer.

Every word, equation, and illustration was conceived, composed and placed on pages by me. For better than six months I worked on this text whenever time permitted, as well as on numerous occasions when it did not.

I am very fortunate to have a job that gives me time to work on projects such as this, even if the time spent was considered ill-advised by some.

For much of the material in this text I am indebted to others. I am indebted to those who contributed the works cited in the Bibliography as well as to many other articles, books, and reports that have passed through my hands.

I am indebted to all fellow motor designers and consultants that I have crossed paths with over the years. I am also indebted to all those who have engaged my services as a consultant. Thank you. I hope you find this text useful.

The material presented here is not taught j n any academic environment that I am aware of, despite the fact that brushless permanent magnet motors play an important role in the world economy. As technology pro-. This is certainly true of motor design. As a result, texts such as this one play a valuable role in documenting the intellectual content of one particular highly-specialized discipline.

The highly specialized nature of technological disciplines promotes the need for and existence of specialists, i. I am one of those people in the area of brushless permanent magnet motors. If I can be of service to you, please feel free to contact me. If I cannot help you directly, I can help you find someone who can.

Sincerely, Duane Hanselman March You've just picked up another book on motors. You've seen many others, but they all assume that you know more about motors than you do. Phrases such as armature reaction, slot leakage, fractional pitch, and skew factor are used with little or no introduction. You keep looking for a book that is written from a more basic, yet rigorous, perspective and you're hoping this is it.

If the above describes at least part of your reason for picking up this book, then this book is for you. This book starts with basic concepts, provides intuitive reasoning for them, and gradually builds a set of understandable concepts for the design of brushless permanent magnet motors. It is meant to be the book to read before all other motor books. Every possible design variation is not considered.

Only basic design concepts are covered in depth. However, the concepts illustrated are described in such a way that common design variations follow naturally. If the first paragraph above does not describe your reason for picking up this book, then this book may still be for you.

It is for you if you are looking for a fresh approach to this material. It is also for you if you are looking for a modern text that brings together material normally scattered in numerous texts and articles many of which were written decades ago. Is this book for you if you are never going to design a motor? By all means, yes. Although the number of people who actually design motors is very small, many more people specify and use motors in an infinite variety of applications.

The material presented in this text will provide the designers of systems containing motors a wealth of information about how brushless permanent magnet motors work and what the basic performance tradeoffs are. Used wisely, this information will lead to better engineered motor systems. Why a book on brushless permanent magnet motor design? This book is motivated by the ever increasing use of brushless permanent magnet motors in applications ranging from hard disk drives to a variety of industrial and military uses.

Brushless permanent magnet motors have become attractive because of the significant improvements in permanent magnets over the past decade, similar improvements in power electronics devices, and the ever increasing need to develop smaller, cheaper, and more energy efficient motors. At the present time, brushless permanent magnet motors are not the most prevalent motor type in use. However, as their cost contin-.

Finally, what's missing from this book? What's missing is the "nuts and bolts" required to actually build a motor. It does not include commercial material specifications and their suppliers, such as those for electrical steels, permanent magnets, adhesives, wire tables, bearings, etc. In addition, this book does not discuss the variety of manufacturing processes used in motor fabrication.

While this information is needed to build a motor, much of it becomes outdated as new materials and processes evolve. Moreover, the inclusion of this material would dilute the primary focus of this book, which is to understand the intricacies and tradeoffs in the magnetic design of brushless permanent magnet motors.

I hope that you find this book useful and perhaps enlightening. If you have corrections, please share them with me, as it is impossible to eliminate all errors, especially as sole author. I also welcome your comments and constructive criticisms about the material. This chapter develops a number of basic motor concepts in a way that appeals to your intuition. In doing so, the concepts are more likely to make sense, especially when these concepts are used for motor design in later chapters.

Many of the concepts presented here apply to most motor types since all motors are constructed of similar materials and all produce the same output, namely torque. These specific motor types evolved over time to satisfy different application niches, but their operating principles are essentially identical.


Brushless Permanent Magnet Motor Design By Duane C Hanselman

Duane C. Written for electrical, electronics and mechanical engineers responsible for designing and specifying motors, as well as motor topologies, this guide covers topics ranging from the fundamentals of generic motor design to concepts for designing brushless permanent-magnet motors. In addition, the author explains techniques for magnetic modelling and circuit analysis, shows how magnetic circuit analysis applies to motor design, describes major aspects of motor operation and design in simple mathematical terms, develops design equations for radial flux and axial flux motors, and illustrates basic motor drive schemes. The text aims to clearly define all common motor design terms. Hanselman, Duane C.


Brushless Permanent Magnet Motor Design




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