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Electric Machines is designed to serve as a textbook for a course on electrical machines for undergraduate students of engineering. It provides an insight into the fundamentals of the theory and performance of electric machines. The book includes comprehensive discussions on phasor diagrams and their applications in the study of electric machines. Beginning with topics such as three-phase circuits, transformers, and machine windings, the book goes on to cover induction machines, synchronous machines, and direct current machines as also their transient and dynamic characteristics. Discussions on magnetic aspects of electric machines, principles of electromechanical energy conversion, and power semiconductor-controlled devices make the book a complete text for undergraduate students. Written in an easy-to-understand manner; the book presents the relevant topics in a systematic and lucid manner. Solved examples have been interspersed through the text to illustrate problem-solving methodologies. A large number of unsolved problems have been included to test the students understanding of the concepts discussed. Key Features 1. Reviews important concepts of phasor diagrams, electromagnetic field theory, and electromechanical energy conversion 2. Includes discussions on power semiconductor-controlled drives 3. Discusses steady-state theory and performance of various types of machines 4. Incorporates pedagogical features such as illustrations, photographs, solved examples, and end-of-chapter exercises About The Author Mulukutla S. Sarma is currently Professor of electrical engineering in the Department of Electrical and Computer Engineering at Northeastern University, Boston. He has authored several textbooks in the field of electrical engineering. He has to his credit a number of technical articles published in leading journals, including the first studies of methods for computer-aided analysis of three-dimensional nonlinear electromagnetic field problems as applied to the design of electrical machinery. He is a Life-Fellow of IEEE (USA) and a reviewer of several IEEE Transactions. His research interests include electric machines, energy conversion, electromagnetic fields in electrical devices, and simulation and control of power systems. Mukesh Kumar Pathak is currently Assistant Professor in the Electrical Engineering Department at IIT Roorkee. A PhD from IIT Delhi, he has more than 20 years of teaching experience at illustrious institutes of higher education such as NIT Hamirpur and NIT Kurukshetra. He has several research papers to his credit. He is a life member of ISTE. His research interests include electrical machines, power electronics, control of electric drives, power quality, and converter control. Table Of Contents PART I INTRODUCTION 1. A Review Of Phasor Diagrams 2. Phase Circuits 3.The Magnetic Aspect 4. Transformers 5. Principles Of Electromechanical Energy Conversion 6. Machine Windings PART II STEADY STATE THEORY AND PERFORMANCE 7. Induction Machines 8. Synchronous Machines 9. Direct Current Machines PART III TRANSIENTS AND DYNAMICS 10. Transients and Dynamics of AC Machines 11. Direct Current Machine Dynamics 12. Power Semiconductor Controlled Drives