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ETCE TC2K Course Outline – EET 213W EET 213W – Fundamentals of Electrical Machines Using Writing Skills Standard Course Outline (Updated – Fall 2005) Catalog Description: 213W: Fundamentals of Electrical Machines Using Writing Skills (5 credits). AC and DC machinery principles and applications; introduction to magnetic circuits, transformers, and electrical machines, including laboratory applications. Prerequisites: Engl 015, EET114. Goals of the Course: Fundamentals of Electrical Machines Using Writing Skills is a required course for sophomore-level students in the Electrical Engineering Technology (EET) associate degree program. The purpose of the course is to teach principles of AC and DC motors and generators, and AC transformers and how they work. Basic concepts of electromagnetic circuits as they relate to voltages, currents, and physical forces induced in conductors are covered, including application to practical problems of machine design. Practical analytical models for most types of motors, generators, and transformers commonly used in industry are developed, and the models are used to analyze power requirements, power capability, efficiency, operating characteristics, control requirements, and electrical demands of these machines. EET 213W is also a "writing-intensive" course that teaches students to prepare formal, written technical documents. This goal is accomplished through extensive writing exercises performed in the context of laboratory exercises that accompany the course. Relationship to EET Program Outcomes: EET 213W contributes to the following EET program outcomes: Course Outcomes: The specific course outcomes supporting the program outcomes are: Rev 2 Students should be able to apply basic knowledge in electronics, electrical circuit analysis, electrical machines, microprocessors, and programmable logic controllers. (Outcome 1) Students should be able to apply basic mathematical, scientific, and engineering concepts to technical problem solving. (Outcome 3) Students should be able to communicate effectively orally, visually, and in writing. (Outcome 5) Students should be able to work effectively in teams. (Outcome 6) Students should understand professional, ethical and social responsibilities. (Outcome 7) Students should have a commitment to quality, timeliness, and continuous improvement. (Outcome 11) OUTCOME 1: Students will be able to use standard methods to determine accurate modeling/simulation parameters for various general-purpose electrical machines and transformers. Students will be able to use modeling/simulation parameters with standard equivalent circuit models to predict correctly the expected performance of various general-purpose electrical machines and transformers. Students will be able use accepted national and international standards (such as NEMA) to select appropriate electrical machines to meet specified performance requirements. Students will demonstrate an understanding of the fundamental control practices associated with AC and DC machines (starting, reversing, braking, plugging, etc.) OUTCOME 3: Students will be able to use concepts in trigonometry, complex algebra, and phasors to find correct solutions to electrical machine performance questions. OUTCOME 5: Students will be able to use standard word-processing and mathematical analysis software to prepare professional quality written reports. Students will be able to prepare professional quality graphical presentations of laboratory data and computational results, incorporating accepted data analysis and synthesis methods. Students will be able to use suitable visual and graphic aids to prepare and give 1 Aug. 2005 ETCE TC2K Course Outline – EET 213W professional quality presentations on technical subjects. Suggested Texts: OUTCOME 6: Students will work in teams to conduct experiments, analyze results, and develop technically sound reports of outcomes. OUTCOME 7: Primarily via team-based laboratory activities, students will demonstrate the ability to interact effectively on a social and interpersonal level with fellow students, and will demonstrate the ability to divide up and share task responsibilities to complete assignments. Students will be required to investigate various social, ethical, and professional responsibilities in the controversial use of technology and defend a suitable solution. OUTCOME 11: Via required writing assignments, students will demonstrate the ability to prepare, according to a prescribed schedule, revisions of written documents of increasing quality. The following are suitable texts and/or references for this course: Hubert, Electrical Machines-Theory, Operation, Applications, & Control, Prentice Hall. Sen, Principles of Electric Machines & Power Electronics, Wiley Ryff, Electric Machinery, Prentice Hall Pearman, Electrical Machinery & Transformer Technology, Saunders Guru & Hiziroglu, Electric Machinery & Transformers, Saunders Wildi, Electrical Machines, Drives, and Power Systems, Prentice Hall The following are useful references for this course: Kosow, Electric Machinery and Control, Prentice-Hall Siskind, Electrical Machines, McGraw-Hill Chapman, Electric Machinery Fundamentals, McGraw-Hill Prerequisites by Topic: Students are expected to have the following topical knowledge upon entering this course: Course Topics: Coverage times shown in parentheses are suggestions only. Note - One hour as indicated here represents one 50-minute class. 14 week semester allows 56 hours total. Rev 2 Satisfactory completion of basic circuits courses, including AC circuit concepts. Ability to use a computer to prepare written reports and to perform basic data reduction, graphing, and engineering data presentation. Basic understanding of algebra, trigonometry, complex numbers, and phasors. Magnetics: field properties, materials, hysteresis & saturation, magnetic circuits, induction, motor & generator action. (3 hours) Transformers: construction, ideal & practical models, polarity, impedance, parameter testing, regulation, efficiency, ratings, parallel operation & load sharing. (7 hours) Specialty transformers: auto, 3φ, and instrument transformers. (2 hours) 3φ Induction Motors: construction, synchronous speed & slip, rotor & stator circuit models, developed & output power, torque, efficiency, torque-speed curves, classification standards, stall & starting torque, parameter measurement, starting methods, reversing, plugging. (13 hours) 1φ Induction Motors: quadrature fields &/or rotating field theory, starting methods, torque equations. (2 hours) Specialty Motors: brushless DC, stepper, hysteresis, and reluctance motors. (2 hours) Synchronous Motors: construction, operating concepts, starting methods, torque & torque angle, armature reaction, circuit models & phasor diagrams, V-curves, power factor control, pull-out torque, parameter testing, losses & efficiency. (8 hours) Synchronous Generators: motor-generator transition, phasor diagrams, synchronizing, power factor control, voltage regulation, operation on infinite grid. (8 hours) 2 Aug. 2005 ETCE TC2K Course Outline – EET 213W DC Machines: commutation, shunt, series, and compound motor models, developed power & torque, losses & efficiency, starting, braking, and speed control. (8 hours) In-class examinations (3 hours) Computer Use: Students are expected to use computers both to prepare lab reports and conduct some out-ofclass assignments. Computers will be used to analyze lab data, prepare engineering graphs for reports, and perform analytic studies of transformer, motor, and generator performance. Knowledge of word-processing, spreadsheet, and mathematical analysis software (viz., Mathcad, Matlab, TKSolver, etc.) is required. Laboratory Exercises: Typical laboratory exercises include the following: Required Equipment: Transformer basics (V-I relationships, polarity testing, voltage regulation) Autotransformers (kVA amplification, step-up & step-down operation) or 3-phase transformers (Constructing 3-phase banks from single-phase transformers, wye/delta connections) 3φ squirrel-cage (or wound-rotor) induction motor performance (reversing, torquespeed curves, start & stall torque, efficiency, power factor, & effects of rotor resistance) Single-phase induction motor performance (starting & running torque, power factor) Synchronous motor performance (start & pull-out torque, power factor ctrl, V-curves) Synchronous alternator performance (synchronizing, regulation, power factor ctrl) Shunt, series, & compound DC motor performance DC motor starting methods / controls The following is the minimum equipment required to conduct this course: AC and DC voltage, current, and 1φ and 3φ power meters 1φ power transformers (1kVA or larger recommended) 3φ squirrel-cage induction motors (0.25kW or larger recommended) 1φ induction motors (split-phase, capacitor-start & -run, universal recommended) 3φ synchronous motor/generators (0.25kW or larger recommended) Rotary dynamometer or prony brake appropriate for measuring motor torque Tachometers Resistive, capacitive, and inductive 3φ loads suitable for generator outputs The following equipment is also useful: Course Grading: 3φ wound-rotor induction motors (0.25kW or larger recommended) Transformers with buck-boost and T-connections Phase angle meters Watt-var meters DC motor starters SCR speed controllers Synchroscope or synchronizing lamps Course grading policies are left to the discretion of the individual instructor with the stipulation that at least 25% of the course grade must be determined from the writing component (see following item). Communication Skills: The "W" designation on this course means that writing assignments must be a fundamental part of the course. This goal is most easily met by requiring lab reports to be formal, written reports. The reports must follow an accepted technical writing style and must be concise, technically correct, and grammatically sound. Reports must be prepared using a word processor and printed in an accepted professional format. As required by the University "W" designation, (1) grading of written exercises will give comparable weight to grammatical quality and technical merit, and (2) grades on written material will represent at least 25% of the class grade. The "W" designation also requires that this course teach students good oral communication skills. Therefore, the course also requires students to prepare and present oral reports of their technical work. Reports are graded, and these grades are included in the overall class grade. Library Use/Research Rev 2 Students should be required to use library technical resources and electronic-based data sources 3 Aug. 2005 ETCE TC2K Course Outline – EET 213W Requirements: in the preparation of at least one lab/research report assigned in this course. Course Assessment The following may be useful methods for assessing the success of this course in achieving the intended outcomes listed above: Course Coordinator: Rev 2 Outcomes 1 & 3: Traditional exams and out-of-class problem assignments covering lecture materials generally can be used to assess these outcomes. Outcomes 5, 6 & 11: Formal laboratory reports and/or comprehensive research-based projects, created using any of a variety of typical professional formats (research/test report, business letter, technical memo, lab notebook, etc.), accompanied by oral presentation of results, are effective methods of demonstrating achievement of this outcome. Outcome 7: Team-based assignments (viz. in lab exercises) in which success (i.e., team-based rather than individually-based grades) requires are effective student interaction and effective work-load sharing can be useful for assessing success with respect to this outcome. Todd Batzel, Assistant Professor of Electrical Engineering, Altoona College ([email protected]) 4 Aug. 2005