Course code ETeh4014
Credit points 3
Total Hours in Course81
Number of hours for lectures16
Number of hours for seminars and practical classes8
Number of hours for laboratory classes8
Independent study hours49
Date of course confirmation16.03.2011
Responsible UnitInstitute of Engineering and Energetics
Dr. sc. ing.
The aim of the study course is to acquire types of electric drive (ED) and control principles in engineering systems, ED control-protection equipment (contactors, heat relays, shift and rotary switches and sensors, electronic starters, programmable controllers, frequency converters), ED automatic start-up schemes reading and reading (direct run, with current limit, low voltage, soft start), ED automatic braking and positioning, (recuperation, anti-lock, dynamic, capacitor, magnetic, combined), frequency controlled ED selection, operation and application.
Knowledge - solving theoretical and practical issues of electro-drive (ED) selection, protection and automation of technological equipment - tests, exam;
Skills - to select the automatic ED components, to make their parameters calculations, to draw up the ED's automatic control technological and electrical circuits, to identify and eliminate failures in ED activities - practical works, exam;
Competence - technological equipment for ED, automatic control principle and control equipment, automatic ED performance evaluation and selection of improvement solutions - exam.
Full time intramural studies:
Lectures
1. Basic concepts of electric drive (ED). Unregulated and regulated ED for its applications in agriculture and woodworking. 1h
2. Asynchronous motor power and heat flow balance, heating and mechanical characteristics, thermal resistance classes. 1h
3. Conditions for automatic ED asynchronous motor (AM) selection for long-term, temporary and re-short-term operation. 1h
4. Control and protection equipment (circuit breakers, heat relays, contactors, control relays, road and rotary switches). 1h
Test 1: Engine selection and protection.
5. Direct start current and torque curves for AM. Mutual and sequential blocking mechanism in ED management schemes. 1h
6. Direct start-up and control circuits for scraper conveyor, woodchip flow line, plank blade and reserved pump ED. 1h
7. AM auto-start curves and circuits (with limited stator current, low-voltage stator circuit). -1h
8. AM "soft" start. Design, operation, characteristics and choice of electronic starter depending on ED power and load. 1h
9. AM "soft" start-up electrical circuits. Selecting and setting up "soft" startup options under ED operating conditions. 1h
Test 2: Engine start.
10. ED automatic braking and positioning. Circular braking with anti-lock (realization, curves, circuits). 1h
11. ED automatic dynamic braking for conveyor (conveyor) positioning (realization, curves, circuits). 1h
12. ED machine positioning using capacitor or / and magnetic braking (realization, characteristic curves, circuits). 1h
Test 3: Braking and positioning of the drive.
13. Frequency controlled ED. Frequency Converters (FC) (implementation, curves, circuits). 1h
14. Structure and operation of voltage inverter. Voltage and frequency control laws. The efficiency of FD & AM. 1h
15. Pumping equipment with frequency controlled ED. Calculation of the choice of centrifugal pump motor and frequency converter. 1h
16. Frequency controlled water supply control circuitry. Choice of pump control and power consumption. 1h
Test 4: Adjustable electric drive.
Laboratory works
1. Relay automation circuits. 2h
2. Electric braking of electric motors. 2h
3. Electric motor starting methods. 2h
4. Electric drive control programming. 2h
Practical works
1. Design of automatic electric drive circuits. 2h
2. Research of asynchronous electric motor operating modes. 2h
3. Reactive power compensation for electric drive. 2h
4. PLC and frequency converter programming. 2h
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
Oral exam.
The exam consists of three theoretical questions and a practical calculation exercise and a discussion of what has been done.
All the laboratory work and practical work planned must be developed.
Independent works according to the subject of the tests.
Quality of work performance. Understanding what you have done. Ability to logically justify processes and explain the causes of errors. Ability to discuss what you have learned.
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2. Valeinis J. Ievads elektriskās piedziņas vadības sistēmās. Rīga: RTU, 2007. 163 lpp.
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1. Baltiņš A., Kanbergs A., Miesniece S. Zemsprieguma elektriskie aparāti. Rīga: Jumava, 2003. 331 lpp.
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3. ABB Industrial Manuel. Lurd, Wallin & Tryckeri AB, 1998. 1191pp.
1. Enerģētika un automatizācija. ISSN 1407-8580. Profesionāls žurnāls par enerģētiku un automatizācijas risinājumiem/ www.baltenergy.com
Compulsory course in full-time and part-time studies of professional higher education bachelor study program "Applied Energy Engineering".