Electric Machinery and Transformers, Third Edition

Electric Machinery and Transformers has been written for students at the junior/senior level studying various types of electrical machines. Based upon many years of teach­ing experience, the textbook is developed in such a way that it provides maximum flex­ibility without any loss of continuity from one topic to another. We feel that this approach would enable an instructor to easily adapt the material to meet the require­ments of a course in electrical machines. For institutions that are on a quarter system and offer only one course in electrical machines, we suggest that they concentrate more on the fundamentals and budget the time for the advanced topics.

The textbook concentrates on the basic operation of each machine and tends to minimize the nonessentials. The material presented in each chapter progresses from established principles to advanced topics. In the second edition, we included a large number of review questions at the end of each chapter. Since the addition of review questions has been greatly appreciated by the students, we have kept it intact in the third edition as well. Based upon the comments received from students, other instruc­tors, and reviewers, we have added substantial amount of new material either to rem­edy perceived deficiencies or to further clarify the concepts. We have also changed some examples in the text to complement the theoretical development preceding each of these examples. In addition, we have also revised some of the exercises at the end of each section. As we stated in the second edition, these exercises are expected to nurture confidence and enhance the comprehension of the material presented in each section. We have also revised the problems at the end of each chapter and arranged them in such a way that they offer a wide range of challenges for the stu­dent. These problems must be treated as an integral part of the learning process and the student should use intuitive reasoning to solve them.

Some of the problems in the text require the solution of nonlinear equations and we suggest that the student should be encouraged to solve these problems using software packages such as MathCAD®. We have used MathCAD® to solve almost all the examples in this textbook. We encourage the use of a software package because it reduces the drudgery of mundane calculations, enables the student to probe fur­ther into the intricacies of a machine, and helps the student to focus on “what if” types of queries.


1. Review of Electric Circuit Theory
2. Review of Basic Laws of Electromagnetism
3. Principles of Electromechanical Energy Conversion
4. Transformers
5. Direct-Current Generators
6. Direct-Current Motors
7. Synchronous Generators
8. Synchronous Motors
9. Polyphase Induction Motors
10. Single-Phase Motors
11. Dynamics of Electric Machines
12. Special-Purpose Electric Machines
System of Units
The Laplace Transform

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