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Electric Machines and Electric Drive I

Course developer

Prior knowledge

ETeh2019, Applied Electrical Engineering

Replaced course

EeTkB006 [GEIKB006] Electric Machines and Electric Drive

Course abstract

The aim of the study course is to 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.

Learning outcomes and their assessment

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.

Competence - 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.

Course Content(Calendar)

Full time intramural studies:
1. History, importance and classification of electric machines (EM). The simplest electric motor. (Lectures 0,5 h)
2. 3- phase asynchronous motor: construction, operation principle, nominal parameters, connection to the network. (Lectures 0,5 h, Laboratory works 2h)
3 .Rotating magnetic field and electromagnetic torque of the asynchronous motor. (Lectures 0,5 h)
4. Start up, brake, and reverse of the asynchronous motor. (Lectures 0,5 h, Laboratory works 2h)
5 .Modifications and operating modes. Rotor slider of the asynchronous motor. (Lectures 0,5 h)
6 .Mechanical characteristics and its calculation used passport data. (Lectures 0,5 h)
7. Equivalent scheme, equations for voltage and current. (Lectures 0,5 h)
8 .Power loss and efficiency coefficients. Vector diagram. (Lectures 0,5 h)
9 .Power factor and power factor improvement methods. (Lectures 0,5 h)
10. Work patterns and electric drive control circuits of the asynchronous motor. (Lectures 0,5 h, Laboratory works 2h)
11. Principles of choice and protection of the asynchronous motor. (Lectures 0,5 h)
12. Asynchronous motor with phase rotor. Design, operating principle, nominal parameters, connection to the network.
13. Asynchronous motor with phase rotor: start-up and mechanical characteristics; (Lectures 0,5 h, Laboratory works 2h)
14. Asynchronous motor with phase rotor: speed control; Single-phase asynchronous motors; (Lectures 0,5 h)
15. Choice of electric drive, management principles and optimization possibilities. (Lectures 1 h)
Test. Asynchronous motor. At least two short theoretical questions and at least one asynchronous motor calculation task. At least half of the maximum score must be for the positive evaluation.
Part time extramural studies:

All topics specified for full time studies are accomplished, but the number of contact hours is one half of the number specified in the calendar

Requirements for awarding credit points

Written theory test. The student is admitted to the test only if the laboratory works have been developed and passed in time and the independent work has been positively evaluated. At least half of the maximum possible score must be obtained.The exam consists of three questions:
1. The question about EM theory;
2. The question about practical work (EM calculation);

3. The question about laboratory work.

Description of the organization and tasks of students’ independent work

The student prepares a 15-20 pages e-report or oral presentation on a freely chosen theme in an area of EM including control schemes, diagrams and examples of engineering-technical solutions and calculations. At least half of the maximum score must be for the positive evaluation.

Criteria for Evaluating Learning Outcomes

The positive evaluation 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.

At least half of the maximum score must be for the positive evaluation.

Compulsory reading

1. Dirba J., Ketners K. Elektriskās mašīnas. 2. izd. Rīga: RTU Izdevniecība, 2009. 534 lpp
2. Moskvins G. Elektropiedziņas modelēšana. Jelgava: LLU, 2008. 51 lpp.

3. Valeinis J. Ievads elektriskās piedziņas vadības sistēmās. Riga: RTU izdevniecība, 2007. 163 lpp.

Further reading

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.
3. Dirba J., Ketners K. Elektriskās mašīnas. Rīga: RTU Izdevniecība, 2007. 516 lpp. ISBN 978-9984-32-457-9.
4. Electric machinery. A. Fitzgerald et al. International Student Edition. 4th Edition. Auckland-London- Tokyo, 1983. 571 p.

5. Draper A. Electrical machines. Longmans Ko LTD, 1991. 346 p.

Periodicals and other sources

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

Notes

Compulsory course in full-time and part-time studies of professional higher education bachelor study program Applied Energy Engineering.