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Sample Pages
Preface This third edition has been extensively restructured to reflect these changes. The material on ac motors and generators is now covered in Chapters 4 through 7, before the material on dc machines. In addition, the dc machinery coverage is reduced compared to earlier editions. Chapter 1 provides an introduction to basic machinery concepts, and concludes by applying those concepts to a linear dc machine, which is the simplest possible example of a machine. Chapter 2 covers transformers, and Chapter 3 is an introduction to solid-state power electronic circuits. The material in Chapter 3 is optional, but it supports ac and dc motor control discussions in Chapters 7, 9, and 10. After Chapter 3, an instructor may choose to teach either dc or ac machinery first. Chapters 4 through 9 cover ac machinery, and Chapters 8 and 9 cover dc machinery. These chapter sequences have been made completely independent of each other, so that an instructor can cover the material in the order which best suits his or her needs. For example, a one-semester course with a primary concentration in ac machinery might consist of parts of Chapters 1, 2, 3, 4, 5, 6, and 7, with any remaining time devoted to dc machinery. A one-semester course with a primary concentration in dc machinery might consist of parts of Chapters 1, 3, 8, and 9, with any remaining time devoted to ac machinery. Chapter 10 is devoted to single-phase and special-purpose motors, such as universal motors, stepper motors, brushless dc motors, shaded-pole motors, etc. The homework problems and the ends of chapters have been revised and corrected, and more than 70% of the problems are either new or modified since the last edition. In recent years, there have been major changes in the methods used to teach machinery to Electrical Engineering and Electrical Technology students. Excellent analytical tools such as MATLAB® have become widely available in University engineering curricula. These tools make very complex calculations simple to perform, and allow students to explore the behavior of problems interactively. The new edition of Electric Machinery Fundamentals makes selected use of MATLAB to enhance a student's learning experience where appropriate. For example, students use MATLAB in Chapter 7 to calculate the torque-speed characteristics of induction motors, and to explore the properties of double-cage induction motors. This text does not teach MATLAB; it assumes that the student is familiar with it through previous work. Also, the book does not depend on a student having MATLAB. MATLAB provides an enhancement to the learning experience if it is available, but if it is not, the examples involving MATLAB can simply be skipped, and the remainder of the text still makes sense. This book would never have been possible without the help of dozens of people over the past 14 years. I am not able to acknowledge them all here, but I would especially like to thank Charles P. LeMone, Teruo Nakawaga, and Tadeo Mose of Toshiba International Corporation for their invaluable help with the solid-state machinery control material in Chapter 3. I would also like to thank the reviewers who contributed to this edition. The reviewers of this edition were Stephen A. Sebo of Ohio State University at Columbus; Duane F. Rost of Youngstown State University; Saul Goldberg of California Polytechnic State University at San Luis Obispo; L.L. Grigsby of Auburn University; William F. Weldon of University of Texas at Austin; V. Ajjarapu of Iowa State University; and Yasser Al-Rashid of Wichita State University. Their comments and suggestions are much appreciated. Finally, I would like to thank my wife Rosa and our children Avi, David, Rachel, Aaron, Sarah, Naomi, and Shira for their forbearance during the revision process. I would like to apologize for my virtual absence from their lives over the last year.
Stephen J. Chapman MATLAB is a registered trademark of The MathWorks, Inc., 24 Prime Park Way, Natick, MA 01760-1500, Phone: 508-647-7000, http://www.mathworks.com.
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