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 andelectromagnetics 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. Italso 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 therote 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; andspecial-purpose machines.

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 Measurement ; 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 Equations ; 5.5 Developed Torque ; 5.6 Magnetization Charateristic of a DC Machine ; 5.7 Theory of Communication ; 5.8 Armature Reaction ; 5.9 Types of DC Machines ; 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 Geneators ; 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 Characteristics ; 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 Fact 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 ELECTRICLA MACHINES ; 11.1 Introduction ; 11.2 DC Machines ; 11.3 Synchronous Generator Dynamics ; Summary ; Review Questions ; Problems ; 12 SPECIAL-PURPOSE ELECTRIC MACHIENS ; 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