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Lecturer(s)
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Veg Lukáš, Ing. Ph.D.
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Laksar Jan, Ing. Ph.D.
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Course content
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1) Division of electrical machines, principles. Advantages and disadvantages of using electric machines in mobility. Evolution, examples of use in practice. 2) Dimensioning of electrical machines. Machine dimensions, power equation, equivalent power. Radial flux machines (internal vs. external rotor), axial flux machines, effect on power equation. The relationship between the DC bus voltage and the phase voltage of the machine. PWM modulation with zero-sequence voltage component, effect on phase voltage. Design and calculation methods. 3+4) Comparison of electrical machines suitable for electromobility (IM, PMSM (PMa)SynRM, EESM, ...). Dimensions, differences in design and operation. Operating characteristics of electrical machines, behavior in different modes. The choice of machine parameters, the effect of limiting the direct-axis current. Effect of change in input voltage, temperature. 5) Winding of electrical machines in electromobility. Distributed, fractional-slot, and tooth winding. Higher spatial harmonics, additional losses, torque ripple, noise. Limitation of parasitic phenomena (skewing of the rotor, semi-closed slots, magnetic wedges). 6) Additional losses in electrical machines fed from inverters. Losses in magnetic circuit, permanent magnets, windings. Loss mitigation adjustments. The influence of winding arrangement and technology (stranded, rectangular, hairpin) on the increase of losses in the winding. 7) Multiphase electrical machines in electromobility. DC vs. phase voltage, fault tolerance, injection of higher harmonics, influence on the operating characteristics of the machine. 8) Construction of electrical machines, IP, IM, IC, automotive and traction specialties, differences between radial and axial flux machines, linear motors, SRM, SynRM, BLDC. 9) Housings of electrical machines. Design, types, force load, parasitic phenomena, materials, expected properties with regard to a specific type of machine. 10) Stators and windings. Design, segments and overlapping of steel sheets, materials, (pole attachment, axial securing of stator packets), insulation system, effect of temperature, force action, self-supporting winding, hairpin winding. 11) Rotors and shafts. Design, materials, rotor stars, fixing of rotor poles, rotor packets, securing PM, production, and machining of shafts. 12) Securing of rotating parts of electrical machines (conventional bearings, couplings, bearing shields), magnetic bearings, air bearings, and their use. 13) Cooling of electrical machines, fans, special types of cooling (water jacket), spray-cooling, impingement jet cooling, examples of use in the field of electromobility.
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Learning activities and teaching methods
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Laboratory work, Lecture
- Contact hours
- 52 hours per semester
- Preparation for laboratory testing; outcome analysis (1-8)
- 8 hours per semester
- Preparation for an examination (30-60)
- 45 hours per semester
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| prerequisite |
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| Knowledge |
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| know the basic types of electrical machines |
| describe the principles of electrical machines |
| Skills |
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| apply basic mathematical operations and electrotechnical relations |
| analyze a simple electrical circuit |
| Competences |
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| N/A |
| learning outcomes |
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| Knowledge |
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| define the traction characteristic of an electric machine for electromobility |
| clarify the design and details of different types of electrical machines |
| orientate in modern directions of increasing power density and suppressing the negative effects of electric machines in electromobility |
| Skills |
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| define the requirements for the parameters and characteristics of the electrical machine |
| determine the suitability of using different types of electric machines in electromobility |
| evaluate the appropriateness of the design solution of the electrical machine |
| Competences |
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| N/A |
| N/A |
| teaching methods |
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| Knowledge |
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| Lecture |
| Multimedia supported teaching |
| Practicum |
| Laboratory work |
| Skills |
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| Lecture |
| Multimedia supported teaching |
| Practicum |
| Laboratory work |
| Competences |
|---|
| Lecture |
| Multimedia supported teaching |
| Practicum |
| Laboratory work |
| assessment methods |
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| Knowledge |
|---|
| Combined exam |
| Skills demonstration during practicum |
| 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, Václav. Elektrické stroje. 1. vyd. V Plzni : Západočeská univerzita, 2006. ISBN 80-7043-444-9.
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Ehsani, Mehrdad; Emadi, Ali; Gao, Yimin. Modern electric, hybrid electric, and fuel cell vehicles : fundamentals, theory, and design. 2nd ed. Boca Raton : CRC Press, 2010. ISBN 978-1-4200-5398-2.
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Husain, Iqbal. Electric and hybrid vehicles : design fundamentals. 2nd ed. Boca Raton : CRC Press, 2011. ISBN 978-1-4398-1175-7.
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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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Kopylov, Igor Petrovič; Voženílek, Petr. Stavba elektrických strojů. 1. vyd. Praha : Státní nakladatelství technické literatury, 1988.
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Marius Rosu, et. al. Multiphysics Simulation by Design for Electrical Machines, Power Electronics and Drives. Piscataway, USA, 2018. ISBN 978-1-119-10344-8.
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Wei Tong. Mechanical Design of Electric Motors. Boca Raton, 2014. ISBN 9781420091441.
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