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Měření a modelování synchronních reluktančních motorů
Gábriš, Richard ; Bárta, Jan (oponent) ; Vítek, Ondřej (vedoucí práce)
Táto bakalárska práca v úvode popisuje princíp fungovania a využitie synchrónnych reluktančných motorov. Jadro práce je rozdelené na dve časti. V prvej je popísané merania na vzorkách motorov a vyhodnotenie merania. Obsahom druhej časti je tvorba modelu motora v programe ANSYS Maxwell, analýza výsledkov a ich porovnanie s výsledkami získanými meraním.
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Vyhledávací studie ochvatu obce Hrochův Týnec
Bárta, Jan ; Valentová, Veronika (oponent) ; Radimský, Michal (vedoucí práce)
Předmětem bakalářské práce je vyhledávací stude obchvatu obce Hrochův týnec. Obchvat bude navržen jako cesta kategorie S 9,5/80 a bude navazovat na stávající komunikaci I/17, která prochází středem obce. První napojení na stávající komunikaci bude před obcí Hrochův Týnec a druhé napojení na stávající komunikaci bude za obcí Čankovice. Důvodem pro vybudování obchvatu je zvýšení bezpečnosti v obci, snížení intenzity dopravy v obci a snížení hluku a otřesů od nákladní dopravy.
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The optimum supply of a wound-rotor synchronous machine with respect to maximum efficiency
Laštovička, Josef ; Cipín, Radoslav (oponent) ; Bárta, Jan (vedoucí práce)
The master's thesis deals with a literature review of electric motors suitable for the electric vehicle driveline, where the main focus is given to a wound-field synchronous machine. At first, there is a short description of machine construction and the working principle for each type of suitable electric machine. The advantages and disadvantages of using a specific machine as a traction drive are summarized, and an eventual example of use in today's electric car with basic machine specifications is given. In the next part, a more detailed focus is given to the wound-rotor synchronous machine and its use for electric vehicle drive. The second chapter deals with the modification of this machine type for traction applications. A machine capable of dual-mode operation is presented, followed by a discussion of non-contact current transfer to the rotor winding, and finally, the possibility of using a hairpin winding made of rectangular conductors is presented. The third part of the thesis deals with the mathematical description of the machine, including direct and quadrature axis equivalent circuits and an explanation of the vector diagram in motor mode. In the last two chapters of the thesis, a Python program is introduced to analyze the machine's operating characteristics. During the program build, an analysis methodology for this type of machine based on the provided data package was developed, and graphical dependencies of torque and efficiency on different input currents combinations were exported. The program also includes a function for finding the optimum current supply for the machine with respect to the maximum efficiency.
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Shlukování slov podle významu
Bárta, Jakub ; Otrusina, Lubomír (oponent) ; Smrž, Pavel (vedoucí práce)
Tato bakalářská práce se zabývá návrhem a implementací modulárního systému pro analýzu textového korpusu a následné vyhledávání sémanticky podobných slov. Systém umožňuje stemming korpusu, uživatel si může zvolit z různých způsobů analýzy korpus (matice spoluvýskytu, LSA).
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Zálohování dat a datová úložiště
Bárta, Jan ; Tobek, Zdenko (oponent) ; Kříž, Jiří (vedoucí práce)
Tato bakalářská práce se zaměřuje na problematiku spojenou se zálohováním dat ve firmě XY, která se zabývá převážně specializovanými překlady pro své zákazníky. Výsledek bakalářské práce je návrh na efektivnější řešení zálohování dat na základě analýzy.
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Nízkohlučné vozovky
Bárta, Jan ; Frýbort, David (oponent) ; Hýzl, Petr (vedoucí práce)
Diplomová práce se zabývá problematikou nízkohlučných vozovek. V teoretické části je popsán dopravní hluk, zdroje hluku, nízkohlučné povrchy vozovek. Praktická část se zabývá dvěma konkrétními návrhy - nízkohlučného asfaltového koberce mastixového SMA 8 LA a düsseldorfskou asfaltovou směsí LOA 5.
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Design of a Magnetic Bearing for an Electrical Machine
Rúra, Dávid ; Vítek, Ondřej (oponent) ; Bárta, Jan (vedoucí práce)
The current development in the field of electric machinery is focusing on high-speed electric machines. This opens also other fields related to high-speed machines. One of them are magnetic bearing systems. Tradition approach of using ball bearing brings a few problems in design dealing with friction at high speeds. Together with magnetic bearings, development is their control. Faster chips opened a new way of thinking of control and helped to evolve robust control loops. The biggest advantage of magnetic bearing is non-friction run and almost no maintenance. Compare to traditional ball bearing, a magnetic bearing system needs more space and in some applications could happen that the shaft will be twice as long. This problem can be solved designing complex system with motor and integrated magnetic bearing what leads to downsizing. In this master thesis, the design of magnetic bearing for 12kw, 45000rpm is discussed. It focuses on practical design and correlations between parameter selection. The analytical approach is used to sketch the design and optimization is done afterwards. Problem with an analytical design is that it doesn't cover all parasitic phenomenae and thus numerical modelling snd optimization are demanded. Also, the critical speed analyze is included in this thesis. The results of the work will be used for manufacturing prototype as an extension to the existing high-speed machine.
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Electromagnetic analysis and modeling of a solid rotor induction machine
Bílek, Vladimír ; Vítek, Ondřej (oponent) ; Bárta, Jan (vedoucí práce)
This Master's thesis deals with the electromagnetic analysis and modeling of a solid rotor induction machine. The work includes a state-of-review on the topic of high-speed electrical machines, with the description of their advantages and disadvantages compared to conventional electrical machines with gearboxes, division of high-speed electrical machines with solid rotors, and comparison of their advantages and disadvantages, where the emphasis is placed mainly on high-speed induction machines with solid rotors and their use and applications in industry. Furthermore, the work deals with methods of calculation of electrical induction machines with solid rotors. Thus, methods for analytical calculation and finite element calculation of induction machines with solid rotors are described here. Above all, the emphasis is placed on the finite element method in a 2D space using correction end-effect factors, which are divided and described in detail here. Based on the obtained literature, an electric machine with a solid rotor is calculated using electromagnetic FEM analysis. The calculation of the machine is automatized with Python script. As another main objective of this work is to describe the so called surrogate models, their advantages and disadvantages, their use in industry and especially the application of surrogate models to a electrical machines with a solid rotor. Using surrogate models, the case study machine with a solid rotor is then optimized using SymSpace and Optimizer. For the optimizations, 3 machine designs were considered and eventually compared with each other from an electromagnetic performance point of view.
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