| Code |
8565
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| Year |
3
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| Semester |
S2
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| ECTS Credits |
6
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| Workload |
PL(15H)/T(15H)/TP(30H)
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| Scientific area |
Electrotechnics and Electronics
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Entry requirements |
Not applicable.
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Mode of delivery |
Face-to-Face.
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Work placements |
Not Applicable.
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Learning outcomes |
The main objectives of this course unit are the study of the constructional features, operating principles and main applications of three-phase synchronous and asynchronous electric machines.
At the end of this course unit the student should be able to select and use three-phase synchronous and asynchronous electric machines.
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Syllabus |
ASYNCHRONOUS MACHINES:
Introduction.
Constructional features.
Windings.
Rotating magnetic field.
Induced voltages.
Polyphase induction machines.
Equivalent circuit model: no-load and blocked-rotor tests.
Performance characteristics.
Power flow diagram.
Rotor resistance effects.
Starting of induction motors.
Space- and time-harmonics.
SYNCHRONOUS MACHINES:
Introduction.
Constructional features.
Synchronous generators: The infinite bus.
Synchronous motors.
Equivalent circuit model: determination of the synchronous reactance Xs.
Phasor diagram.
Power and torque characteristics.
Salient-pole machines.
Slip test.
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Main Bibliography |
P. C. Sen: "Principles of Electric Machines and Power Electronics", John Wiley & Sons.
S. J. Chapman: "Electric Machinery Fundamentals", McGraw-Hill.
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Teaching Methodologies and Assessment Criteria |
At the theoretical classes the course contents are presented through classic methodologies, which can be done by videoconference. The laboratory classrooms are devoted to the conduct of tests and computer model simulations. All need documentation is previously available on Moodle platform.
All students who are present in 75% of all classes and obtained positive grade in the practical component are allowed to do the exam.
Exemption from final examination is subject to obtaining a minimum grade of 10 (ten), in a maximum grade of 20 (twenty) in both the practical component and in the written test. The continuous evaluation grade is assigned according to: NFreq = 0.75xNT +0.25xNP.
The students allowed to do the exam must obtain a minimum grade of 10 (ten), in a maximum grade of 20 (twenty) in the written exam. The final grade is obtained according to: NF = Greatest of {(0.75x NE +0.25xNP);NFreq}.
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Language |
Portuguese. Tutorial support is available in English.
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