Electrical Machines II
Part of this Programme
Level of Qualification|Semesters|ECTS
Bachelor | Semestral | 6
Year | Type of course unit | Language
3 |Mandatory |Português
Total of Working Hours | Duration of Contact (hours)
168 | 75
Recommended complementary curricular units
Prerequisites and co-requisites
1- Electromechanical Energy Conversion: bonding field, magnetic co-energy, electromagnetic forces and binaries. 2- Rotating ME windings: magnetomotive forces, windings with discrete and sinusoidal distributions, rotating field, inductance, voltage equations and winding currents (ETCE). 3- Three Phase Asynchronous Machine (MA): inductance matrices, ETCE, Clarke and Park transformations, binary. 4- Equivalent model of balanced steady-state MA (REE): analysis, energy balance, Thévenim model, binary, characteristic curves. 5- Synchronous Machine (MS): inductance matrices, reluctance and reaction torque, start-up maneuver. 6- Equivalent model of MS in REE: deduction and analysis, synchronous reactance, power angle, energy balance, torque, operation as motor, as generator and as synchronous compensator. 7- Special Machines: stepper, reluctance, hybrid, single-phase induction motors and universal series.
This curricular unit (UC) follows the programmatic contents taught in the UC of Electrical Machines I. In the latter, some of the necessary analysis tools, such as the transformer and the DC machine, have been introduced. study and analysis of the asynchronous machine, the synchronous machine and some special electric machines. It is intended to provide students with analytical skills and tools for the design of electrical machines (ME), developing their ability to understand the operating principles inherent to each machine, as well as their applicability in practical problems. Simultaneously, it is intended that students be able to increase their critical spirit in the analysis of results, promoting the experimental evidence of the concepts taught through laboratory tests and the performance of simulation works, using models developed by the students.
Knowledge, abilities and skills to be acquired
It is advisable that students have already acquired the knowledge taught in the curricular units of Electrical Machines I, Calculus, Algebra and Electromagnetism.
Teaching methodologies and assessment
Five hours of face-to-face lectures per week, of which 2h are theoretical, expository, 2h theoretical-practical, for analytical resolution of examples and specific problems and 1h of laboratory, for demonstration and experimental verification of theoretical concepts taught. There are two modalities of evaluation: Continuous assessment - two frequencies in the normal period of classes, each with a weight of 35% in the final evaluation. For this modality also contributes the evaluation obtained in the laboratory component with a weight of 30%. It is noted that, in this area, approval is only possible if the average obtained in the two frequencies is greater than or equal to 10 values. Assessment by exam - the most successful exam grade is counted There are two normal exam periods to which all students enrolled can have access and a special time to which only those students who meet the criteria for access to the special period can be admitted no reg. of evaluation
- Apontamentos dados na disciplina de Máquinas Eléctricas II ¿ Hugo Marques.
- Electric Machinery, A.E.Fitzgerald; Northeastearn University; Charles Kingsley Jr, Stephen D. Umans; Fift Edition - McGraw Hill.
- Analysis of Electric Machinery and Drive Systems; Paul C. Krause, Oleg Wasynczuk, Scott D. Sudhoff; Second Edition - IEEE Press.
- Principles of Electric Machines and Power Electronics, Sen, P.C; Jonh Wiley & Sons, NY 1989.
- Electric Machinery Fundamentals, Stephen J. Chapman; 3ºEdição, McGraw Hill Int. Ed, 1989.
- Electric Machines and Drives, Gordon R. Slemon; Addison-Wesley Publishing Company.