Course code ETeh4014

Credit points 2

Automatic Electrical Drive

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

Course developer

author Enerģētikas institūts

Ainārs Galiņš

Dr. sc. ing.

Course abstract

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.

Learning outcomes and their assessment

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.

Course Content(Calendar)

Full time intramural studies:
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

Requirements for awarding credit points

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.

Description of the organization and tasks of students’ independent work

Independent works according to the subject of the tests.

Criteria for Evaluating Learning Outcomes

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.

Compulsory reading

1. Šnīders A., Straume I. Automātiskā elektriskā piedziņa: Mācību grāmata. Jelgava: LLU, 2008. 164 lpp.
2. Valeinis J. Ievads elektriskās piedziņas vadības sistēmās. Rīga: RTU, 2007. 163 lpp.
3. Ribickis L., Valeinis J.Elektriskā piedziņa mehatronikas sistēmās. Rīga: RTU, 2008. 286 lpp.

4. TheMoellerWiringManual. AutomationandPowerDistribution. 2 nd. edition. Editor: HeidrunRiege. Bonn: MoellerGmbH, 2006. 546 p.

Further reading

1. Baltiņš A., Kanbergs A., Miesniece S. Zemsprieguma elektriskie aparāti. Rīga: Jumava, 2003. 331 lpp.
2. Dirba J., Ketners K. Elektriskās mašīnas. Rīga: RTU, 2007. 517. lpp.

3. ABB Industrial Manuel. Lurd, Wallin & Tryckeri AB, 1998. 1191pp.

Periodicals and other sources

1. Enerģētika un automatizācija. ISSN 1407-8580. Profesionāls žurnāls par enerģētiku un automatizācijas risinājumiem/


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