Electromechanical Conversion of Energy (FSI-REE)

Academic year 2021/2022
Supervisor: doc. Ing. Ondřej Vítek, Ph.D.  
Supervising institute: ÚMTMB all courses guaranted by this institute
Teaching language: Czech
Aims of the course unit:
To acquaint the students with the principle of operation and performance of transformers, induction machines, DC machines and synchronous machines. The theoretical knowledge is proved in laboratory exercises.
Learning outcomes and competences:
The students will be acquainted with the basic knowledge of electromechanical energy conversion, with basic constructional parts of electrical machines and with the principle of electrical machines operation. Single-phase and multiphase transformers. Parallel operation. Three-phase induction motor. Generation of revolving magnetic field. Torque characteristic, starting of induction motors. Single-phase induction motor. Three-phase induction motor on single-phase mains. Principle of operation and basic equations of a synchronous machine. Non-salient pole synchronous machine. Salient pole synchronous machine. Connection to the electrical grid. DC machine principle of operation. DC generators.Performance of DC motors.
Prerequisites:
Basic laws and terminology of electrical and mechanical engineering. Three-phase systems.
Course contents:

The basic laws of electromagnetism applied in the theory of electrical machines. Magnetic circuits of electrical machines. The basic voltage equations, equivalent circuit diagrams, phasor diagrams, the basic electrical connections of electrical machines. Energy and power flow diagrams, losses and efficiency. Torque equation. Electrical machines performance. Basic characteristics of electrical machines.

 
Teaching methods and criteria:
The course is taught through lectures explaining the basic principles and theory of the discipline. Teaching is supplemented by laboratory and numerical exercises.
Assesment methods and criteria linked to learning outcomes:

Three control tests, 20 points together. Credit minimum: 10 points.

Four protocols, each one for two points. Credit minimum: none of the protocols with 0 point.

Examination from numerical and laboratory exercises - 7 points. Credit minimum: 4 points.

Final exam - 65 points.

 
Controlled participation in lessons:
Attendance at practical training is obligatory.
Type of course unit:
    Lecture  13 × 2 hrs. optionally                  
    Laboratory exercise  13 × 2 hrs. compulsory                  
Course curriculum:
    Lecture

1. Basic laws of electromagnetism related to electrical machines.
2. Principle of electromechanical energy conversion.
3. Transformers. Ideal transformer, actual transformer, basic equations.
4. Principle of operation and construction of power transformers.
5. Three-phase transformers, winding connection, parallel operation.
6. Magnetic circuit and winding of electrical machines.Principle of operation of induction machine, generation of revolving magnetic field.
7. Equivalent circuit diagram, fundamental equations and torque characteristics.
8. Starting of induction machines, speed control.
9. Single-phase induction machine. Three-phase induction machine in single-phase mains.
10. Synchronous machine. Principle of operation and construction.
11. Theory of non-salient machine. Torque characteristic, synchronous machine with individual load and parallel operation.
12. DC machines. Principle of operation and construction, fundamental equations.
13. DC machines steady-state performance.

 
    Laboratory exercise

1. Work safety and the main parts of rotary electrical machines. Assembly and disassembly of electrical machines.
2. Principle of torque measurement, dynamometer.
3. No load a short circuit transformer test.
4. Winding connection. Load test a efficiency, measurement of a transformer.
5. Three-phase induction motor. Winding connection. No load and blocked rotor test. Induction motor parametr determination.
6. Measurement of induction motor torque characteristics.
7. Induction motor starting.
8. Synchronous machine parallel operating with mains.
9. Measurement of torque characteristics.
10. Parametr determination of synchronous machine with salient poles and with nosalient rotor.
11. DC machine. No load test. Selfexcitation of shunt generator.
12. Connection of DC motor to mains. Speed control characteristics of DC motors.
13. Evaluation.

 
The study programmes with the given course:
Programme Study form Branch Spec. Final classification   Course-unit credits     Obligation     Level     Year     Semester  
B3A-P full-time study B-MET Mechatronics -- Cr,Ex 5 Compulsory 1 3 S