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Lecturer(s)
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Beran Václav, doc. Ing. Ph.D.
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Sála Aleš, Ing. Ph.D.
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Peřina Ivan, Ing. Ph.D.
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Šístek Martin, Ing.
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Toth Drahomír, Ing.
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Course content
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Program of lectures: 1) ELECTROMECHANICS: Basic theories of electromechanical transformations, multi-winding system, energy / coenergy, forces. 2) ELECTROMECHANICS: Moving systems, energy balance and forces, application to the moving and rotating system, transformation and movement induced voltage. 3) Transformers: equivalent circuit (losses and efficiency), voltage drop - short circuit voltage, transient phenomena (sudden short circuit, start-up current). 4) Transformers: Three-phase transformers, magnetizing current (influence of winding connection), Autotransformers, parallel cooperation of transformers. 5) Rotating machines: Rotating magnetic field (2-phase, 3-phase), basic view of three-phase winding, winding factor, space harmonics. 6) Induction machine: Basic structure - properties and usage, equivalent circuit, transformation of equivalent circuit into gamma-shape form, factor c1. 7) Induction machine: Voltage ration, losses and efficiency, energy balance during acceleration, torque characteristic as depend on slip and speed, circular inversion of the impedance line. 8) Induction machine: Start-up, soft start, Y-D, braking, speed control u/f, PWM principle in relation to the machine. 9) Synchronous machine: Basic design - properties and usage, equivalent circuit for non-salient rotor, synchronous reactance, g-ratio, phasor diagram for non-salient rotor, short-circuit ratio. 10) Synchronous machine: Mathematical model, overloading, synchronization torque, machine on the grid, circle diagram, standalone generator. 11) Synchronous machine: Decomposition on d-q component (equivalent circuit and phasor diagram with Xd and Xq), torque characteristic and machine performance, PM machines. 12) DC machines: Basic construction - properties and usage, purpose of individual windings, losses and efficiency, induced voltage and torque of the machine, characteristics according to the connection. 13) DC machines: classical commutation, electronic commutation in relation to EC motors, BLDC motor. Laboratories 1) Introduction to laboratory regulations and safety regulations, conditions for granting credit 2) Transformers: No-load and short-circuit test measurement, winding resistance measurement, transformer voltage ratio, measurement of self- and mutual- inductances. 3) Transformers: determination of the parameters of the substitution scheme from the measurement (comparison with the self-inductance and mutual inductance) 4) Autotransformers: Measurement of self- and mutual- inductances ATR (for substitution diagram). 5) Induction machines: No-load and short-circuit test measurement, voltage ratio of the machine 6) Induction machines: current diagram, determination of the parameters of the substitution scheme from measurement 7) Synchronous machine: No-load and short-circuit test measurement 8) Synchronous machine: Measurement of machine reactances 9) Synchronous machine: connection to the grid, loading characteristics of the machine 10) Synchronous machine: determination of the current ration based on measurement, overloading, phasor diagram on a scale 11) DC machine: Dynamo loading 12) DC machine: DC motor loading 13) Recapitulation and discussion
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Learning activities and teaching methods
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- Contact hours
- 65 hours per semester
- Preparation for comprehensive test (10-40)
- 15 hours per semester
- Preparation for an examination (30-60)
- 45 hours per semester
- Preparation for laboratory testing; outcome analysis (1-8)
- 8 hours per semester
- unspecified
- 45 hours per semester
- Contact hours
- 20 hours per semester
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| prerequisite |
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| Knowledge |
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| explain the principle of the operation of basic electrical machines |
| draw the magnetic field distribution in a specified magnetic circuit geometry |
| Skills |
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| to analyze a simple electrical circuit |
| using a symbolic-complex method |
| Competences |
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| N/A |
| N/A |
| N/A |
| N/A |
| learning outcomes |
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| Knowledge |
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| to define basic principles of electromechanical transformation |
| to explain the principles of electric machines and their behavior under specific conditions using verbal, graphic and mathematical description |
| to explain key physical processes that affect electrical machines behaviour and to discuss their interrelationships |
| Skills |
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| to perform basic measurements on an electrical machine |
| Competences |
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| N/A |
| N/A |
| N/A |
| teaching methods |
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| Knowledge |
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| Lecture supplemented with a discussion |
| Laboratory work |
| Skills |
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| Lecture with visual aids |
| Laboratory work |
| Competences |
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| Lecture supplemented with a discussion |
| assessment methods |
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| Knowledge |
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| Combined exam |
| Test |
| Skills |
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| Combined exam |
| Skills demonstration during practicum |
| Competences |
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| Combined exam |
| Skills demonstration during practicum |
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Recommended literature
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Bartoš, V. Teorie elektrických strojů. Plzeň, 2006. ISBN 80-7043-509-7.
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Bašta, Jan; Chládek, Jaroslav; Mayer, Imrich. Teorie elektrických strojů. 1. vyd. Praha : SNTL, 1968.
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Charles Kingsley, Stephen Umans, A Fitzgerald. Electric Machinery, 7th edition. Humanities & Social Sciences, 2013. ISBN 978-0073380469.
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Juha Pyrhonen, Tapani Jokinen, Valeria Hrabovcova. Design of Rotating Electrical Machines, 2nd Edition. Wiley, 2013. ISBN 978-1-118-58157-5.
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