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Calculation of heat and force field UniGear ZS1
Mokrý, Lukáš ; ABB, Drahomír Tůma, (referee) ; Dohnal, Petr (advisor)
The aim of my work is to describe high-voltage switchgear type UniGear 500R, which is part of UniGear switchgears family. I will focus on heating issue of one 500R unit and its parts during operation. Maximum values of this heating is limited by standards and can´t be exceed to ensure safe and reliable operation. That is why the heating tests are necessary part of designing and developing switchgears. Calculation will be made by two different ways. First is classic one-pole heating net method and second is numerical simulation in Solidworks flow simulation program. Except the theoretical description there will be presented also used 3D model and explanation of both method, used to calculation and simulation. Last point of this work is measuring of this type of switchgear and getting real data. The main point there is to compare measured values with values calculated and decide if is possible to simulate tests with appropriate accuracy. Then would be also possible to substitute the real test in laboratory, which costs many thousand crowns and takes lots hours of time. This work is collaborated with EJF division of ABB Company, where I am employed. Heating issues in this company is always on process, because of developing and improving of their products. So this work could be helpful in this field. ABB provides all materials needed, especially technical catalogues, 3D model and final values from laboratory measuring. Support from college faculty is mainly in study consultations and proposing of calculations making. In the end of work will be make final comparison and evaluation of achieved results.
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Dynamic simulation of DC motor using FEM
Gottwald, Michal ; Huzlík, Rostislav (referee) ; Vítek, Ondřej (advisor)
My diploma thesis deals with a specific dynamic model of DC motor with the parameters obtained from the calculation and from the program using the finite element method. It shows how much accurate results can be achieved in the model, if you use only the values which can be measured, recorded and calculated on the engine. This thesis contens three parts. First part describes the structure and function of DC motor and the basic principle and the use of FEM. Next is calculation analytical and numerical parameters. The search parameters include torque, resistance and inductance of armature winding, resistance and inductance of excitation windings. The last part is dedicated to creating a dynamic model. Results from the dynamic model and measured values are compared in the conclusion of my thesis.
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Magnetic field analysis with finite element method and magnetic sensor
Volf, Tomáš ; Kurfűrst, Jiří (referee) ; Skalka, Miroslav (advisor)
The magnetic field analysis by MKP and magnetic probe project deals with magnetic field analysis of asynchronous machine cross section. This analysis is written in detail along with the necessary theory of asynchronous machine and the ANSYS program. The magnetic field of selected machine is measured by magnetic probe and results are compared with calculation. The next part of thesis is draft of device for the magnetic field analysis.
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Increase the Rated Voltage of the Vehicle's Circuit - Study
Horák, Richard ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
The point of this work is evaluate the parameters of automotive electric system and according to these properties choose suitable norm of higher voltage, propose conception of system and with analyst calculation suggest basic granary parameters of higher voltage. This calculation is enclosed. In the work is mentioned a historical development of required escalation in system and therewith connected changes of specified levels of system tension. As an exemplification of escalation calculus hereof electrical equipment, installed onto motor powered vehicle, are mentioned in attachment schema's of four vehicles Škoda Auto a.s.
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Vertical lathe machines
Holub, Vojtěch ; Krbalová, Maria (referee) ; Blecha, Petr (advisor)
The first part of this bachelor thesis deals with types of vertical lathe machines and their description. Then there is an summary of leading produces of this machines. This thesis is focused on current machines. In the second part is shown computational design of chosen part of machine.
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Odsávání ve stolařském závodu
Lysáček, Pavel
The bachelor thesis is focused on dimensioning of the exhaustion system for joinery manufacturers and describes necessary adjustments for the smooth operation of the manufactory. The thesis also deals with the theoretical calculation for the output of the exhaus-tion system using the method of total pressure. For the calculation of an output needed for ensuring the smooth exhaustion of wood residues around machines the amount of exhausted air and the total pressure of the main branch of the exhaustion system are used.
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Managing of Foreign Exchange Risk
Holiš, Jakub ; Taušer, Josef (advisor) ; Sedláček, Jiří (referee)
Práce definuje kurzová rizika (transakční, ekonomické a translační). Uvádí obecné důvody zajištění kurzového rizika a dva způsoby jeho kalkulace. Metody zajištění rozděluje na interní a externí. Interním je v práci věnována jen okrajová role. Externí metody zahrnují zajištění pomocí prodeje pohledávky, měnového forwardu, devizových operací na peněžním trhu, futures kontraktů a opcí. Závěrem případová studie na téma českého exportéra, porovnávající zajištění prostřednictvím forwardu a opční strategie.
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