Course code ETeh4045

Credit points 2

Total Hours in Course80

Number of hours for lectures16

Number of hours for seminars and practical classes8

Number of hours for laboratory classes8

Independent study hours48

Date of course confirmation16.03.2011

Responsible UnitInstitute of Energetics

Enerģētikas institūts
## Genādijs Moskvins

Dr. habil. sc. ing.

ETeh4044, Electric Machines and Electric Drive I

Students obtain the construction of electric DC and AC machines, operation, principle of action, mathematical models, operation regimes, start, switching, rotation frequency control, diagrams and work characteristics. Knowledge about electric motor application for technological equipment driving, methods for identifying the parameters of electric machines, the choice for electric machine, control and machine protection methods get obtained.

Knowledge - in the field of electric machines & electric drive systems to solve the theoretical and practical tasks in power engineering, agriculture and technological processes and to improve their operation quality.

Skills- to choose electric machines & electric drive complex, elements and components, to analyse their work process in static and dynamic modes, to compose electric machines & electric drive systems, block diagrams, to perform work process simulation in MATLAB environment, to evaluate electric machines & electric drive operation quality.

Competences - to select an appropriate electric machines & electric drive and devices, methods for identifying the parameters of electric machines, principles of control for conformable technological object, to interpret the operation data of electric machines & electric drive and to perfect their operation quality.

1. Transformer design and operation principle. Modifications and classification of transformers.

2. Basic equations of transformer, equivalent circuits. Vector diagrams.

3. Transformer idle and regime of sudden short circuit attempts. Loss detection in transformers.

4. Transformer efficiency, voltage change and regulation.

5. Parallel operation of the transformer. Analysis of asymmetric regimes.

6. Transformer switching and transition processes: network connection, sudden short circuit, overvoltage;.

7. Construction of DC machine. Operation principle. Anchor reaction.

8. Electromagnetic moment of DC machine. External and mechanical characteristics of DC machines.

9. DC switching. Techniques to improve switching.

10. DC generators with independent, parallel and mixed excitation.

11. DC motors with parallel, series and mixed excitation.

12. Starting, reversing, braking and adjusting DC machines.

13. Design of the synchronous machine. Operation principle, initiation, start-up and idle regime, characteristics.

14. The efficiency of the DC machine. Micro motors.

15. Basics of Electric Drive Theory.

16. Test. DC machines and transformers. At least two short theoretical questions and at least one DC and transformer calculation task.

Written exam. The student admitted to the examination only if the laboratory work, test and independent work is positive evaluated. At least half of the maximum score must be for the positive evaluation.

The exam consists of three questions:

1. The question about automation theory;

2. The question about practical work (EM calculation);

3. The question about laboratory work.

The student prepares a 15-20 pages e-report or oral presentation on a freely chosen theme in an area of DC machines and transformers including control schemes and examples of engineering-technical calculations.

The score of the study course exam consists of the sum of points obtained for each answer of the examination question:

- Full comprehensive, broad answer: 3 points

- Correct answer with minor flaws or errors: 2 points

- Answer that contains only basic concepts without explanation or contains significant errors: 1 point

-There are no answers, the answer is false, and the answer is very gross material errors: 0 point.

Assessment 9 or 10 points can be earned only if respectively 9 or 10 points are earned for independent work.

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1. Zviedris A. Elektriskās mašīnas. Rīga: Zvaigzne, 1984. 367 lpp. 2. Ribickis L., Valeinis J. Elektriskā piedziņa mehatronikas sistēmās. Rīga: RTU izdevniecība, 2008. 286 lpp. 4. Dirba J., Ketners K. Elektriskās mašīnas. Rīga: RTU Izdevniecība, 2007. 516 lpp. ISBN 978-9984-32-457-9. 5. Electric machinery. A. Fitzgerald et al. International Student Edition. 4th Edition. Auckland-London- Tokyo, 1983. 571 p. 6. Zolbergs J. Vispārīgā elektrotehnika. Rīga: Zvaigzne 1974. 540 lpp. 7. Draper A. Electrical machines. Longmans Ko LTD, 1991. 346 p

1. Bakshi U.A., Bakshi M.V. Electrical Machines. Technical Publications, 2009. 572 p. 2.Stephen J. Electric machinery fundamentals. 4th ed. Includes index. ISBN 0-07- 246523--9. Pieejams: https://eleccompengineering.files.wordpress.com/2014/08/stephen_chapman_electric_machinery_fundamentalsbookfi-org-1.pdf sk.03.01.2019