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AUB/FEA/ECE ELECTRIC MACHINERY – EECE 470 OFFERED AS EE ELECTIVE COURSE COURSE OBJECTIVES ¾ The “Electric Machinery” EECE470 course provides fundamental theory related to electromechanical energy conversion processes, namely transformers, motors, and generators. ¾ EECE470 is a pre-requisite to a series of machines and drives- related courses and laboratories. ¾ EECE470 also provides sufficient background to a wide scope of topics and courses in the EE program such as power electronics, control, instrumentation, electric power and industrial electrification. COURSE OUTLINE INTRODUCTION I- MAGNETIC SYSTEMS Review of magnetic fields and circuits: Faraday's and Ampere's laws, self and mutual inductances. Hysteresis loop. Magnetic material: ferromagnetism, losses, permanent magnets, characteristics and applications, demagnetization, systems with permanent magnets. II- TRANSFORMERS Construction, types, no-load conditions, ideal transformers. Real transformers: equivalent circuits and phasor diagrams, open-circuit and short-circuit testing, voltage regulation, and efficiency. Autotransformers, variable-frequency and special transformers. Three-phase transformers: analysis and applications. Per-unit system. III- FUNDAMENTALS OF DC MACHINES Mechanical construction, induced voltage and torque in a rotating loop, commutator action, armature windings connections: Lap and wave windings. Problems associated with commutation. Voltages and torques induced in real dc machines, power flow diagram and losses. IV- FUNDAMENTALS OF AC MACHINES Mechanical construction, rotating magnetic field of polyphase windings, reversing the direction of rotation, pulsating field of single-phase winding, mmf and flux distribution, induced voltage and torque. Power flow diagram and losses. V- SYNCHRONOUS GENERATORS Construction, principle of operation. Equivalent circuit and phasor diagrams, operation and external characteristics, testing, power capability curve. Synchronization. 1 COURSE INSTRUCTOR: Prof. F. Chaaban. Course Assessment: Two quizzes and a final in addition to class work (Home works and drop quizzes). Q1: Second week of April. Q2: Second week of May. TEXTBOOK: "Electric Machinery Fundamentals" S. Chapman, 4th Ed., McGraw-Hill, 2005. OTHER REFERENCES: "Electric Machinery", Fitzgerald et al, 2003. "Electric Machinery and Transformers", B. Guru, 3rd Edition, Oxford Un. Press, 2001. LEARNING OUTCOMES By the end of the course, students should be able to: • • • • • • • • • • Understand the basics of electromagnetic systems. Get acquainted with permanent magnets and their applications. Understand the operation and characteristics of transformers. Understand the mechanical construction of electric machines. Describe different stages of electromechanical energy conversion. Simplify the complex machine operations by means of equivalent circuits. Draw power flow charts for motors and generators. Understand the operation of ac synchronous generators. Acquire basic knowledge for more advanced courses. Relate the theory to real life cases. 2 Lectures (75 minutes) 1. 2. 3. 4. 5. 6. 7. 8. 9. Introduction The magnetic field, production, Ampere’s law, analog with electric fields. Magnetic parameters, flux linkage and self-inductance, example. Basic laws on magnetic circuits, examples. Characteristics of magnetic materials, analysis of the Hysteresis loop. Hysteresis and eddy current losses, technologies based on eddy currents, example. Examples, permanent magnets, demagnetization effects, load line. Drop quiz on magnetic circuits, transformers, main applications, construction, and types. Ideal transformers, transformation relations, dot convention, induced voltage equation, examples, 10. Real transformers, excitation current, example, exact equivalent circuit. 11. T- shape, and cantilever equivalent circuits, examples. 12. Phasor diagrams, examples, 13. Transformer testing, voltage regulation and efficiency, example, maximum efficiency criterion. 14. Autotransformers, equivalent circuit, applications, example. 15. Instrument transformers, 3- phase transformers, applications. 16. Examples on 3- phase connections, per- unit system, example. 17. Introduction to rotating machines, mechanical construction of dc machines, voltage and torque in a single rotating loop, example. 18. Electrical and mechanical degrees, frequency expression, commutator action, types of armature windings. 19. Lap and wave windings, voltage and torque expressions in real dc machine, example, power flow diagram, problems with commutation, armature reaction concept. 20. Methods to avoid armature reaction, interpoles and compensating wdgs, example, samples of more realistic configurations. 21. AC machinery fundamentals, types of ac machines, main components, voltage and torque expressions, rotating field of a 3- phase winding, mathematical derivation. 22. Rotating field of a 3- phase winding, graphical interpretation, power flow diagram, winding distribution, voltage and speed regulations, example. 23. Synchronous generators, introduction, construction, field excitation methods, induced voltage, equivalent circuit derivation. 24. Phasor diagrams of synch. Generators, power flow diagram, power and torque expressions, stable operations, examples. 25. Term conclusion 3