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Lecturer(s)
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Skála Ondřej, doc. Ing. Ph.D.
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Dušan Oleksandr, Ing. Ph.D.
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Course content
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1. Power losses in electric drive components in steady states. 2. Idle losses. Connection of load losses with the position of the working point on the moment characteristics. 3. Courses of load torque. Driving resistance of vehicles. Traction characteristics of vehicles. Transmission gear ratio. 4. Field weakening of the electric drive when maximum torque is required and when minimum losses are required. 5. Electric control drive (principles and means of implementation). 6. Cooling of electric drives. Equations of thermal equilibrium (including transient phenomena and electro-thermal analogy). Auxiliary drives and other consumption on vehicles. 7. Motion equation. Variants of conversions of inertial masses. Acceleration and braking. 8. Losses in electric drive components during transients. 9. Cycle start-drive-power-run-brake. Effect on travel time, losses and drive sizing. Tachograms, braking trajectory for target braking. 10. Cooperation of individual drives (vehicles with multiple traction motors and hybrid vehicles). 11. Design of means for minimizing negative effects on the surrounding infrastructure. 12. Losses and losses in the power supply and in the traction line (with regard to the performance and quality of energy consumption). 13. Means for minimizing losses and means for the reverse flow of energy (recovery, use of storage elements). THE EMPHASIS WILL BE PLACED ON solving sample tasks of designing electric drives, i.e.: a) For a given ASM from the catalog, estimate the parameters of the equivalent circuilt and power losses at various working points. b) For the specified load torque cycle, select ASM from the catalog using the equivalent power/torque/current method and perform verification using loss calculation. c) Conversion of engine parameters to a different operating mode (different ambient temperature, etc.). d) Design of a power and control scheme (logical control realized in a classic way and implemented in a logical automaton). e) Traction drive design (gearbox, motor, traction characteristics converter) from the required working points (speed+thrust/acceleration). f) Traction drive design from the required driving cycle. g) Calculation of losses, losses and load on the traction system from one traction vehicle and from several vehicles (specified train diagram).
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Learning activities and teaching methods
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Laboratory work, Lecture
- Graduate study programme term essay (40-50)
- 23 hours per semester
- Preparation for an examination (30-60)
- 33 hours per semester
- Preparation for formative assessments (2-20)
- 12 hours per semester
- Preparation for formative assessments (2-20)
- 6 hours per semester
- Contact hours
- 65 hours per semester
- Contact hours
- 14 hours per semester
- Preparation for an examination (30-60)
- 33 hours per semester
- Individual project (40)
- 22 hours per semester
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| prerequisite |
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| Knowledge |
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| use knowledge of electrical drives and power electronics |
| use knowledge of the theory of electrical machines |
| Skills |
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| explain the function of basic power semiconductor converters |
| draw and explain a phasor diagram for an el. machinery |
| draw and explain a phasor diagram for a part of a power network |
| explain the function of induction motor and synchronous machines |
| apply knowledge of theoretical electrical engineering |
| Competences |
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| N/A |
| N/A |
| learning outcomes |
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| Knowledge |
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| to clarify in detail the issue of the design of electric drive cooling |
| to clarify the issue of the cooperation of individual drives (vehicles with multiple traction motors and hybrid vehicles) |
| assess losses and losses in the power supply and in the traction line (with regard to the performance and quality of energy consumption) |
| Skills |
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| estimate parameters of induction motor equvivalent circuilt and losses at various operating points |
| recalculate engine parameters to a different operating mode (different ambient temperature, etc.) |
| design a traction drive (gearbox, motor, traction characteristics converter) from the required working points |
| design a traction drive from the required driving cycle |
| Competences |
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| N/A |
| N/A |
| teaching methods |
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| Knowledge |
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| Lecture |
| Interactive lecture |
| Individual study |
| Practicum |
| Skills |
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| Lecture |
| Interactive lecture |
| Individual study |
| Practicum |
| Competences |
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| Lecture |
| Interactive lecture |
| Practicum |
| assessment methods |
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| Knowledge |
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| Combined exam |
| Test |
| Seminar work |
| Skills |
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| Combined exam |
| Test |
| Seminar work |
| Competences |
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| Combined exam |
| Test |
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Recommended literature
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Danzer, Jiří. Elektrická trakce I. 1. vyd. Plzeň : Západočeská univerzita, 2000. ISBN 80-7082-633-9.
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JANSA. Trakční mechanika a energetika kolejové dopravy.
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Kule, L., Flajtingr, J. Pohony se střídavými motory a polovodičovými měniči. Skripta ZČU Plzeň, 2002.
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Kummel, F. Elektrické pohony - úlohy a riešenia. ALFA, Bratislava, 1979.
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Lanáková, Gabriela; Oslovič, Vladimír. Pevné elektrické trakčné zariadenia. Vydanie prvé. 2006. ISBN 80-8070-507-0.
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Pavelka, Jiří. Elektrické pohony. Vyd. 1. Praha : Nakladatelství ČVUT, 2007. ISBN 978-80-01-03588-7.
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Pavelka, Jiří; Hlinovský, Vít; Javůrek, Jiří. Cvičení z elektrických pohonů. 1. vyd, dotisk. Praha : Vydavatelství ČVUT, 2001. ISBN 80-01-01900-4.
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Pitterman, Martin. Přehled měničů pro elektrické pohony. První vydání. 2015. ISBN 978-80-261-0598-5.
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Steimel, Andreas. Electric traction - Motive power and energy supply : Basics and practical experience. München : Oldenbourg Industrieverlag, 2008. ISBN 978-3-8356-3132-8.
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