Electric Machinery and Transformers, 3/e

Designed for junior- and senior-level courses in electromechanical energy conversion, Electric Machinery and Transformers, 3/e, continues the strong pedagogical tradition established by its successful previous editions. It begins with a review of the fundamentals of circuit theory and electromagnetics and then introduces the concept of electromechanical energy conversion. The text not only provides a systematic development of a model for each electric machine based upon established principles and basic laws, but also introduces students to applications and advanced topics. It also includes information on the construction of each electric machine.

Electric Machinery and Transformers, 3/e, enhances student learning of the basic operating principles of electric machines by using numerous supporting examples, review questions, illustrations, exercises, and chapter summaries. It encourages intuitive reasoning for problem-solving over the rote memorization of equations and procedures.

This third edition covers the following main topics: principles of electromechanical energy conversion; transformers; direct-current generators and motors; synchronous generators and motors; polyphase induction motors and single-phase motors; the dynamics of electric machines; and special-purpose machines.

CONTENTS

Preface
Acknowledgments
1 Review of Electric Circuit Theory
1.1. Introduction
1.2. Direct-Current Ciruit Analysis
1.3. Alternating-Current Circuit Analysis
1.4. Three-Phase Circuits
1.5. Power and Impendance Measurements
Summary
Review Questions
Problems
2 Review of Basic Laws of Electromagnetism
2.1. Introduction
2.2. Maxwell's Equations
2.3. Magnetic Materials and Their Properties
2.4. Magnetic Circuits
2.5. Self and Mututal Inductances
2.6. Magnetically Coupled Coils
2.7. Magnetic Losses
2.8. Permanent Magnets
Summary
Review Questions
Problems
3 Principles of Electromechanical Energy Conversion
3.1. Introdcution
3.2. Electric Field as a Medium
3.3. Magnetic Field as a Medium
3.4.  A Coil in a Uniform Magnetic Field
3.5.  A Coil in a Time-Varying Magnetic Field
3.6. Synchronous Motor
3.7. Reluctance Motor
3.8. Electromagnetic Relays
Summary
Review Quesitons
Problems
4 Tranformers
4.1. Introduction
4.2. Construction of a Transformer
4.3.  An Ideal Transformer
4.4.  A Nonideal Transformer
4.5. Voltage Regulation
4.6. Maximum Efficiency Criterion
4.7. Determination of Tranformer Parameters
4.8. Per-Unit Computations
4.9. The Autotransformer
4.10. Three-Phase Transformers
4.11. The Constant-Current Transformer
4.12. Instrument Transformers
Summary
Review Questions
Problems
5 Direct-Current Generators
5.1. Introduction
5.2. Mechanical Construction
5.3. Armature Windings
5.4. Induced emf Equation
5.5. Developed Torque
5.6. Magnetization Charateristic of a DC Machine
5.7. Theory of Commutation
5.8. Armature Reaction
5.9. Types of DC Generators
5.10. Voltage Regulation
5.11. Losses in DC Machines
5.12.  A Separately Excited DC Generator
5.13.  A Shunt Generator
5.14.  A Series Generator
5.15. Compound Generators
5.16. Maxiumum Efficiency Criterion
Summary
Review Questions
Problems
6 Direct-Current Motors
6.1. Introduction
6.2. Operation of a DC Motor
6.3. Speed Regulation
6.4. Losses in a DC Motor
6.5.  A Series Motor
6.6.  A Shunt Motor
6.7. The Compound Motor
6.8. Methods of Speed Control
6.9. The Ward-Leonard System
6.10. Torque Measurements
6.11. Braking or Reversing DC Motors
Summary
Review Questions
Problems
7 Synchronous Generators
7.1. Introduction
7.2. Construction of a Synchronous Machine
7.3. Armature Windings
7.4. Pitch Factor
7.5. Distribution Factor
7.6. Winding Connections
7.7. Induced emf Equation
7.8. The Equivalent Circuit
7.9. Power Relationships
7.10. Synchronous Generator Tests
7.11. The External Characteristic
7.12. Salient-Pole Synchronous Generator
7.13. Parallel Operation of Synchronous Generators
Summary
Review Questions
Problems
8 Synchronous Motors
8.1. Introduction
8.2. Construction and Operation of a Synchronous Motor
8.3. Equivalent Circuit of a Synchronous Motor
8.4. Power Expressions
8.5. Exact Condition for Maximum Power
8.6. Effect of Excitation
8.7. Power Factor Correction
Summary
Review Questions
Problems
9 Polyphase Induction Motors
9.1. Introduction
9.2. Construction
9.3. Principle of Operation
9.4. Development of an Equivalent Circuit
9.5.  An Approximate Equivalent Circuit
9.6. Maximym Power Criterion
9.7. Maximum Torque Criterion
9.8. Maximum Efficiency Criterion
9.9. Some Important Conclusions
9.10. Equivalent Circuit Parameters
9.11. Starting of Induction Motors
9.12. Rotor Impedence Tranformation
9.13. Speed Control of Induction Motors
9.14. Types of Induction Motors
Summary
Review Questions
Problems
10 Single-Phase Motors
10.1. Introduction
10.2. Singe-Phase Induction Motor
10.3. Analysis of a Single-Phase Induction Motor
10.4. Types of Single-Phase Induction Motors
10.5. Analysis of a Single-Phase Motor Using Both Windings
10.6. Testing Single-Phase Motors
10.7. Shaded-Pole Motor
10,8. Universal Motor
Summary
Review Questions
Problems
11 Dynamics of Electric Machines
11.1. Introduction
11.2.  DC Machine Dynamics
11.3. Synchronous Generator Dynamics
Summary
Review Questions
Problems
12 Special-Purpose Electric Machines
12.1. Introduction
12.2. Permanent-Magnet Motors
12.3. Step Motors
12.4. Switched-Reluctance Motors
12.5. Brushless DC Motors
12.6. Hystersis Motors
12.7. Linear Induction Motors
Summary
Review Questions
Problems
Appendices
 A System of Units
 B The Laplace Transform
Bibliography
Index