# Electrical Machines C

 Title ΗΛΕΚΤΡΙΚΕΣ ΜΗΧΑΝΕΣ Γ / Electrical Machines C Code ΜΗ0104 Faculty Engineering School Electrical and Computer Engineering Cycle / Level 1st / Undergraduate Teaching Period Spring Coordinator Charalampos Dimoulias Common No Status Active Course ID 20000625

 Academic Year 2017 – 2018 Class Period Winter Faculty Instructors Weekly Hours 6 Class ID 600106934

### Class Schedule

 Building Πολυτεχνείο (πτέρυγα Γ) Floor Όροφος 1 Hall Α3 (2) Calendar Monday 13:00 to 15:00 Building Πολυτεχνείο (πτέρυγα Γ) Floor Όροφος 1 Hall Α7 (4) Calendar Thursdsay 16:00 to 18:00
Course Type 2016-2020
• Scientific Area
Course Type 2011-2015
Specific Foundation / Core
Mode of Delivery
• Face to face
Language of Instruction
• Greek (Instruction, Examination)
Learning Outcomes
After the successful completion of the course the students should be able to: 1) design, in their basic form, the stator and rotor of a synchronous machine so that the created magnetic fields produce the proper electromagnetic torque. 2) Calculate the various electrical parameters and the operating limits of a synchronous machine under steady-state conditions 3) Calculate the behavior of a synchronous machine under symmetrical and non-symmetrical short-circuit conditions at its terminals. 4) Determine the appropriate control on the machine excitation so as to change the reactive power, the magnitude of the voltage and the power factor at the machine terminals. 5) Differentiate the aforementioned methodologies according to the rotor type (cylindrical or salient-pole).
General Competences
• Apply knowledge in practice
• Retrieve, analyse and synthesise data and information, with the use of necessary technologies
• Make decisions
• Work autonomously
Course Content (Syllabus)
The course analyzes the construction and operation of Synchronous Electrical Machines (Generators and Motors). Their steady-state operation and their behavior under short-circuit conditions is mainly analyzed. Specifically, the course analyzes: 1) The main construction parts of a Synchronous Machine (SM) such as the rotor, the stator, the excitation system, the cooling system, the damper windings, etc 2) an elementary SM aiming to the understanding of the creation of the various magnetic fields with it. 3) the creation of a rotating magnetic filed. The creation of electromagnetic torque from the interaction of the stator and rotor magnetic fields is also analyzed. 4) the development of the stator windings so that a sinousoidal voltage waveform is induced on them. 5)the derivation of the electric equivalent circuit of a SM. The differences between cylindrical-rotor and salient-pole machines are demonstrated. 6)the magnetic saturation on the operation of a SM in steady-state conditions. 7)the power losses developed in a SM in steady-state conditions. 8) the regulation of the active and reactive power of a SM. 9) the safe operating margins of a SM 10) the synchronization with the grid procedures. 11) the operation in parallel of multiple SM in order to cover an electric load in the absence of grid. 12) the operation of a SM (generator or motor) when connected to an infinite bus. 13) the behavior of a SM when a short-circuit (symmetrical or non-symmetrical) happens at its electrical terminals. The electrical equivalent circuits during each time phase of a short-circuit are extracted.
Keywords
Synchronous electrical machines, filed excitation, synchronization, interaction of magnetic fields, symmetrical and non-symmetrical short-circuits.
Educational Material Types
• Notes
• Slide presentations
• Multimedia
• Book
Use of Information and Communication Technologies
Use of ICT
• Use of ICT in Course Teaching
• Use of ICT in Communication with Students
Description
The communication with students, for matters concerning the course (announcements, distribution of ppt slides, exams results, other relative web sites, etc) is made via the web site of the course: http://alexander.ee.auth.gr:8083/eTHMMY/cms.course.login.do?method=execute&PRMID=171
Course Organization
ActivitiesWorkloadECTSIndividualTeamworkErasmus
Lectures26
Laboratory Work6
Tutorial26
Total58
Student Assessment
Description
There are written examinations including the theoretical part of course and the ability to solve problems. The students must also submit a small project based on the measurements taken during the lab exercise. The written part of examination has a weight of 80% in the final grade of the course. The rest 20% stems from the lab exercise.
Student Assessment methods
• Written Exam with Extended Answer Questions (Summative)
• Written Exam with Problem Solving (Summative)
• Labortatory Assignment (Summative)
Bibliography
Course Bibliography (Eudoxus)
1) Χ. Δημουλιάς, "Ηλεκτρικές Μηχανές", ISBN: 978-960-418-431-6, ΕΚΔΟΣΕΙΣ Α. ΤΖΙΟΛΑ & ΥΙΟΙ Α.Ε., κωδικός στον ΕΥΔΟΞΟ: 32997559 2)Ι. Ξυπτεράς, "Ηλεκτρικές Μηχανές, Τόμος ΙΙ, Σύγχρονες Μηχανές", ISBN: 960-431-308-8, ΕΚΔΟΣΕΙΣ ΠΕΛΑΓΙΑ ΖΗΤΗ & ΣΙΑ ΟΕ, κωδικός στον ΕΥΔΟΞΟ:11049
Additional bibliography for study
1) Σημειώσεις που αφορούν τις εργαστηριακές ασκήεις και διανέμονται σε ηλεκτρονική μορφή απο την ιστοσελίδα του μαθήματος. 2) Video clips για την δημιουργία των στρεφόμενων και στατικών μαγνητικών πεδίων στην μηχανή. Διανέμονται και με το βιβλίο Νο1 και απο την ιστοσελίδα του μαθήματος.
Last Update
13-07-2013