ELECTROMECHANICAL CONVERTERS

lelec1310  2022-2023  Louvain-la-Neuve

ELECTROMECHANICAL CONVERTERS
5.00 credits
30.0 h + 30.0 h
Q2
Teacher(s)
Dehez Bruno;
Language
French
Prerequisites
- LEPL 1202 (Physics)
- LELEC 1370 (Measurements and electrical circuits)

The prerequisite(s) for this Teaching Unit (Unité d’enseignement – UE) for the programmes/courses that offer this Teaching Unit are specified at the end of this sheet.
Main themes
- Single-phase and three-phase transformers
- General Theory of electromechanical converters
- Rotating field machines
- Asynchronous machines
- Synchronous machines
- DC Machines
Learning outcomes

At the end of this learning unit, the student is able to :

1 In consideration of the reference table AA of the program " Master's degree civil engineer mechanics ", this course contributes to the development, to the acquisition and to the evaluation of the following experiences of learning:
Contribution of the course to the program objectives
Axis 1 (1.1, 1.2, 1.3), Axis 3 (3.3), Axis 5 (5.4)
Specific learning outcomes of the course
At the end of the course, students will be able to:
- Link the fundamental concepts (Faraday's law, energy and magnetic co-energy, ...) to the general equations of an electromechanical converter;
- Build the steady state model (equations and equivalent circuit) of a rotating field machine, an asynchronous machine (three or single-phase), a synchronous machine and a DC machine;
- Build the steady state model (equations and equivalent circuit) of the transformer (single or three phase);
- Experimentally determine the parameters of these models
- Use these models to predict operating conditions of these devices depending on the supply and the load.
In addition, the student will be able to:
- Determine and interpret the characteristic quantities of an electromechanical converter or transformer;
- Identify the main electromechanical converters structures;
- Establish the conditions guaranteeing the energy conversion in an electromechanical converter;
- Explain the principle of the universal motor;
- Explain the ways to increase the starting torque, to reduce the starting current or to vary the speed of an electromechanical converter;
- Explain how to connect and control an alternator on the grid.
 
Content
- Introduction, reminder of the basics of electrical circuits (1h)
- The single-phase transformers (4h): structure, fundamental laws, models of the ideal transformer, of the perfect transformer and of the real transformer, on load operation, experimental parameter identification
- Three-phase transformers (1 hour): structure, connection modes, single-phase equivalent circuit
- The general theory of electromechanical converters (2 hours): classification, structure, basic assumptions, electrical and mechanical equations, magnetic energy and co-energy, electromagnetic torque
- Rotating field machines (4h): general design features, equations, supply, equivalent circuit, saturation, synchronous and asynchronous operating modes, main structures of rotating field machines
- The three-phase asynchronous machine (5h): specific design features, equations, equivalent circuit, phasor diagram (the circle diagram), torque-speed characteristic, operating point, saturation, iron losses, power and efficiency, practical problems (current-starting torque vs efficiency, speed control), specific applications (phase shifter and induction regulator, electrical axis - Selsyn, synchronoscope, Leblanc damper)
- The single-phase induction motor (1 hour): structure, principle and equations
- The synchronous machine (4h): specific design features, equations, equivalent circuits, phasor diagram, operating point (stability), active and reactive power control, connection and control of an alternator on the grid
- The DC machine (2h): specific design features, structure, equations, operating and excitation modes, starting, universal motor
- Introduction, reminder of the basics of electrical circuits (1h)
- The single-phase transformers (4h): structure, fundamental laws, models of the ideal transformer, of the perfect transformer and of the real transformer, on load operation, experimental parameter identification
- Three-phase transformers (1 hour): structure, connection modes, single-phase equivalent circuit
- The general theory of electromechanical converters (2 hours): classification, structure, basic assumptions, electrical and mechanical equations, magnetic energy and co-energy, electromagnetic torque
- Rotating field machines (4h): general design features, equations, supply, equivalent circuit, saturation, synchronous and asynchronous operating modes, main structures of rotating field machines
- The three-phase asynchronous machine (5h): specific design features, equations, equivalent circuit, phasor diagram (the circle diagram), torque-speed characteristic, operating point, saturation, iron losses, power and efficiency, practical problems (current-starting torque vs efficiency, speed control), specific applications (phase shifter and induction regulator, electrical axis - Selsyn, synchronoscope, Leblanc damper)
- The single-phase induction motor (1 hour): structure, principle and equations
- The synchronous machine (4h): specific design features, equations, equivalent circuits, phasor diagram, operating point (stability), active and reactive power control, connection and control of an alternator on the grid
- The DC machine (2h): specific design features, structure, equations, operating and excitation modes, starting, universal motor
Teaching methods
Teaching is organized in:
  • 13 lectures;
  • 7 supervised exercise sessions;
  • 2 practical lab sessions;
  • 3 virtual lab sessions.
The practical lab sessions are carried out in groups of 4 or 5 students and lead to the writing of a synthesis report.
Virtual lab sessions are carried out autonomously online (via iCampus), but consultancy session are nevertheless organized.
The Moodle platform also includes a series of multiple-choice questions allowing the students to evaluate and deepen their understanding of key concepts for the course. It also includes a series of illustrations for better appropriating these concepts.
Depending on the health situation, the teaching activities can be organized in face-to-face, remotly, using videoconference, or a mix of both.
Evaluation methods
Students will be evaluated:
  • Collectively based on the reports of the 2 practical labs performed in groups of 4 to 5 students during the semester;
  • Individually based on a written exam for the exercise part of the course and an oral exam for the theoretical part.
For the written exam, no documents are allowed except a form of two A4 pages written by the student and containing only formulas, diagrams or graphs.
The final mark is the weighted average of the marks obtained for :
  • The reports on the two laboratories, 20%;
  • The written examination on the exercises, 40%;
  • The oral examination on the theory, 40%.
The marks for the laboratory reports are only acquired in case of attendance/participation to the laboratories. They are also acquired in the first session and kept in case of a second session.
Bibliography
- Transparents du cours
- Enoncés et solutionnaires d'exercices
- Notices de laboratoires et laboratoires virtuels
- Illustrations et compléments au cours
- QCM
- Livre de référence :
B. Dehez, D. Grenier, F. Labrique, E. Matagne, Electromécanique. Principes physiques, Principaux Convertisseurs, Principales applications, Presses universitaires de Louvain, 1er éd., 372p.
Faculty or entity
ELEC


Programmes / formations proposant cette unité d'enseignement (UE)

Title of the programme
Sigle
Credits
Prerequisites
Learning outcomes
Specialization track in Electricity

Minor in Electricity