| Course title | Electric Machines and Electric Drive |
| Course code | EeTkB006 |
| Credit points (ECTS) | 5 |
| Total Hours in Course | 135 |
| Number of hours for lectures | 32 |
| Number of hours for seminars and practical classes | 0 |
| Number of hours for laboratory classes | 24 |
| Independent study hours | 79 |
| Date of course confirmation | 13/12/2023 |
| Responsible Unit | Institute of Engineering and Energetics |
| Course developers | |
| Dr. habil. sc. ing., vad.pētn. Genādijs Moskvins |
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| Prior knowledge | |
| ETeh2019, Applied Electrical Engineering |
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| Replaced course | |
| ETeh4044 [GETH4045] Electric Machines and Electric Drive I |
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| 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. |
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| Course Content(Calendar) | |
| In full-time face-to-face studies:
1. History, classification and methodology of electric machines. The primary working model of an electric motor. The principle of reversibility of electric machines. (Lectures, animations and video materials, 1h). 2. Structure of an asynchronous motor with a short-circuited rotor, principle of operation, possibilities of use, nominal parameters, modifications. (Lectures, animations and video materials, 1h). 3. Rotating magnetic field and electromagnetic torque of asynchronous motors. (Lectures, animations and video materials, 1h). 4. Operating characteristic curves of an asynchronous motor. Regulation of rotor cutting speed of asynchronous electric motors. (Lectures, animations and video materials, 1h, laboratory works 1h). 5. Nominal, optimal and rational load of asynchronous electric motors. Power losses and power balance equation of asynchronous electric motors. Efficiency coefficient of asynchronous machines. (Lectures, 1h). 6. Equivalent circuit of asynchronous electric motor, voltage and current equations. Loaded AD vector diagram. (Lectures, 1h). 7. Mechanical characteristic curve of an asynchronous motor. Starting and working modes of asynchronous motors. Conditions of stable operation of asynchronous electric motors. (Lectures, 1h, laboratory works 2h). 8. Types of starting asynchronous motors. Asynchronous motor slippage. Reversing and braking of asynchronous motors. (Lectures, animations and video materials 1h, laboratory work 1h). 9. Nominal, optimal and rational load of asynchronous motors. Overload capability of asynchronous electric motors. Power factor of asynchronous motors and its improvement possibilities. (Lectures, 1h, laboratory works 2h). Test 1. 10. Construction of an asynchronous motor with a phase rotor, principle of operation, advantages and disadvantages, modifications. Mechanical characteristic curve of an asynchronous motor with a phase rotor. (Lectures, animations and video materials 1h). 11. Starting an asynchronous motor with a phase rotor, adjusting slip, torque and rotor rotation speed. (Lectures, animations and video materials, 1h, laboratory works 2h). 12. AM calculations from engine passport data. (Lectures, 1h). Test 2. 13. AM's typical working modes. AM selection and protection principles. (Lectures, 1h). 14. Synchronous machines. Construction of synchronous machines, principle of operation, excitation, starting, idle and load modes. (Lectures, animations and video materials 1h). 15. Single-phase asynchronous motors. (Lectures, animations and video materials 1h) 16. Control work. Topic: Asynchronous electric machines (AM). The test includes at least two short AM theory questions and at least one AM calculation task. At least half of the maximum possible rating must be obtained. 17. Construction and principle of operation of transformers. Modifications and classification of transformers. . (Lectures, animations and video materials, 1h). 18. Basic transformer equations, reduced transformer. Transformer equivalent circuits and vector diagrams. (Lectures 1h, Practical work 2h) 19. Transformer idle and short-circuit attempts. Determination of losses in transformers. (Lectures, animations and video materials, 1h, laboratory works 2h). 20. Transformer efficiency, voltage change and regulation. (Lectures, animations and video materials, 1h, laboratory works 2h). 21. Parallel operation of the transformer. Analysis of non-symmetric modes. Transformer commutation and transient processes: connection to the network, sudden short circuit, overvoltage. (Lectures, 1h) 22. Transformer calculations. (Lectures 1h, laboratory work 2h). Test 3. 23. Construction of direct current machines, principle of operation. Anchor reaction. (Lectures, animations and video materials, 1h). 24. Electromagnetic moment of a direct current machine. External and mechanical characteristic curves of DC machines. (Lectures 1h). 25. Switching of DC machines. Techniques for improving commutations. DC generators with independent, parallel and mixed excitation. (Lectures 1h) 26. DC motors with parallel, series and mixed excitation. (Lectures 1h, laboratory works 2h) 27. Starting, reversing, braking and speed regulation of DC machines. (Lectures 1h, laboratory works 2h). 28. Efficiency coefficient of a direct current machine. Micro engines. (Lectures, 1h). 29. Calculations of DC machines. (Lectures, 2h). Test 4. 30. Fundamentals of electric drive theory. The basic equation of electric drive dynamics. (Lectures, 1h) 31. Electric drive control schemes. (Lectures 1h, laboratory works 2h) 32. Choice of electric drive, justification, control principles and optimization possibilities. (Lectures 1h, laboratory works 2h) Control work 2. DC machines and transformers. The test includes at least two short questions on the theory of electrical machines and at least one calculation task. At least half of the maximum possible rating must be obtained. 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. |
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| Requirements for awarding credit points | |
| 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 EM theory; 2. The question about practical work (EM calculation); 3. The question about laboratory work. |
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| Description of the organization and tasks of students’ independent work | |
| The student prepares a report (15-20 pages) or a presentation (10-12 slides) on the topic of electric machines and electric drives from the proposed list or on a freely chosen topic, including control schemes and examples of engineering-technical calculations. | |
| 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. |
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| Compulsory reading | |
| 1. Dirba J., Ketners K. Elektriskās mašīnas. 2. izd. Rīga: RTU Izdevniecība, 2009, 534 lpp.
2. Dirba, J., Ketners, K. Elektriskās mašīnas. Rīga, RTU Izdevniecība, 2022. – 424 lpp. Trešais izdevums. 3. Moskvins G. Elektropiedziņas modelēšana. Jelgava: LLU, 2008,51 lpp. 4. Valeinis J. Ievads elektriskās piedziņas vadības sistēmās. Rīga: RTU izdevniecība, 2007. 163 lpp. 5. Moskvins G. Elektrisko mašīnu un elektropiedziņas virtuālā modelēšana / Jelgava : LLU, 2020, tiešsaistes resurss, 96 lpp. |
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| 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.E. Fitzgerald, Charles Kingsley, JR., Stephen D. Umans Paperback – January 1, 2005, 608 pages. 5. Draper A. Electrical machines. Longmans Ko LTD, 1991. 346 p. |
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| Periodicals and other sources | |
| 1.Slobodan N. Vukosavic. Electrical Machines, Springer New York, NY, ISBN 978-1-4614-0399-9, 2013, 650 p., https://doi.org/10.1007/978-1-4614-0400-2., sk.03.12.2023.
2.Bakshi U.A., Bakshi M.V. Electrical Machines. Technical Publications, 2009. 572 p. 3.Prithwiraj Purkait , ELECTRICAL MACHINES Paperback, 2017, Oxford Publications; First Edition, 905 pages, ISBN-10: 0199472637, ISBN-13 : 978-0199472635. sk.03.12.2023. |
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| Notes | |
| Compulsory course in full-time and part-time studies of professional higher education bachelor study program Applied Energy Engineering. | |