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Department of Electrical and Computer Engineering Faculty of Engineering and Architecture American University of Beirut EECE 470 - Electric Machines and Power Fundamentals Catalog Description This course covers three-phase circuits and power calculation, magnetic circuits, transformers: single-phase ideal and real transformers, construction, operation, autotransformers, and 3-phase transformers; fundamentals of AC machines: construction and basic concepts; synchronous generators: construction, equivalent circuits, testing and performance characteristics; induction motors construction, principle of operation, tests, power, torque, and efficiency expressions. Course Prerequisites EECE 210 – Electric Circuits Textbook Electric Machinery Fundamentals, S. Chapman, 5th Ed., McGraw-Hill, 2012. Other References Electric Machinery, Fitzgerald et al, McGraw-Hill, 2003 Electric Machinery and Transformers, B.S. Guru and H.R. Hiziroglu, 3rd Edition, 2001 Electric Machines, Drives, and Power Systems, T. Wildi, 6th Edition, 2006 Course Objectives 1. The course provides fundamental theory related to 3-phase circuits, electric machines, and power systems fundamentals. It covers basic concepts of electromagnetism, transformers, and electromechanical energy conversion devices such as motors, and generators. 2. The course is a pre-requisite to a series of machines, power, control, and drives-related courses and laboratories. 3. The course also provides essential support to a wide scope of topics and courses in the ECE program such as power electronics, control, instrumentation, power systems protection and planning, and industrial electrification. Course Outline 1. Magnetic Systems: Review of magnetic fields and circuits: Faraday's and Ampere's laws, fundamental aspects, material saturation; magnetic material: ferromagnetism, hysteresis loop and iron losses; induced voltage and force on a conductor. 2. Three- Phase Circuits: Generation of 3-phase voltages and currents, Delta and Wye connections, power relationships in 3-phase circuits, power triangle, balanced 3-phase systems, power factor correction. 3. Transformers: Principle of operation, construction, types, ideal transformers, real transformers, equivalent circuits and phasor diagrams, open-circuit and short-circuit testing, voltage regulation, efficiency, per- unit system, autotransformers, three- phase transformers; connections. 1 4. Fundamentals of AC Machines: Basic components, rotating magnetic field of poly-phase windings, stator and rotor MMF and flux distribution, induced voltage and torque, power flow and losses. 5. Synchronous Generators: Mechanical construction, methods of excitation, equivalent circuits and phasor diagram, power and torque expressions, open and short-circuit testing, effect of load variations, synchronization. 6. Induction Motors: Construction, principle of operation, types, rotor slip, equivalent circuit, torque- speed characteristic, motor tests, power, losses, and efficiency. Course Learning Outcomes: 1. Analyze basic magnetic circuits. 2. Describe the principle of applying magnetic fields in electric machines 3. Analyze balanced three-phase circuits. 4. Carry out power factor correction calculations. 5. Describe the construction and operation of single-phase and three-phase transformers. 6. Describe the procedure for testing a transformer 7. Determine the equivalent circuit parameters of single- phase transformers. 8. Describe the construction and operation of autotransformers. 9. Describe the behavior of a rotating loop in a uniform magnetic field. 10. Describe the conditions for establishing a rotating magnetic field in a 3-phase machine. 11. Describe the construction and operation of synchronous generators. 12. Describe the procedure for testing a synchronous generator 13. Determine the equivalent circuit parameters of a synchronous generator. 14. Describe the construction and operation of induction motors. 15. Describe the procedure for testing an induction motor 16. Determine the equivalent circuit parameters of an induction motor. 17. Compute the induction motor torque-speed characteristic. Course Assessment Final exam Quizzes (2) Homework & Drop Quizzes Class attendance 40% 40% 15% 5% Prepared by: Dr. Farid Chaaban Last revision: January 2013. 2