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Thermal analysis of induction machines
Hradil, Zdeněk ; Valenta, Jiří (referee) ; Janda, Marcel (advisor)
This master´s thesis enter on the construction, losses and temperature computations asynchronuos engine. Preliminary is talk about the function cage induction motor, than describet construction and losses in this motor and in conclusion describet temperature computations and principia programme ANSYS Workbench and like the example for asynchronuos engine. In conclusion was make the komparative analysis with laboratory measurement for this engine
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Simulation of circuit breaker maglatch dynamic behaviour
Konšel, Ladislav ; Dostál, Lukáš (referee) ; Valenta, Jiří (advisor)
This work includes the theory of circuit breaker construction and is focused mainly on overload function. It mainly deals with electronic circuit breakers, i.e. equipped with an electronic trip unit. The work is focused on the part of trip unit - maglatch of trip unit. For the purposes of simulation, the geometric model is created. Maxwell program is used for the simulation. The work describes the options for conditions input which are necessary for simulation. Using the distribution of magnetic field intensity and magnetic flux density in the section of trip unit maglatch is determined by the simulation. Furthermore, the force effects acting on the armature of the maglatch are calculated. Force values and the directions acting on the armature are determined by changing the simulation parameters - shift of the armature and coil current. Simulations are performed both for steady-state and for dynamic simulation – movement of armature is taken into account. The supply source for the maglatch is created by an external circuit.
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FEM analysis of overcurrent trip unit
Makki, Zbyněk ; Augusta, Zbyněk (referee) ; Valenta, Jiří (advisor)
The aim of the project was to prepare the given model of the current path in the environment of the SolidWorks programme, in order to simulate the flow path in the environment of the Ansys programme, where there was calculated the distribution of current density,voltage drops and heat loss on the the specified current track according to specified conditions. The obtained results are analyzed at the conclusion of this work.
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Analysis of the stator and rotor pack termination effect on the synchronous machine by FEM
Michailidis, Petr ; Valenta, Jiří (referee) ; Skalka, Miroslav (advisor)
This thesis deals with simulation’s possibilities of the electromagnetic fields in electrical machines. A finite element method is the final element technique. The content of this thesis is a model and mesh creation and electromagnetic simulation of synchronous machine. The stator and rotor pack termination effect on the synchronous machine.is analyzed by finite element method in ANSYS program. The type of the stator termination pack is described by four segments. The magnetic field distribution is deformed due to the material properties of used segments. In the next part a methodics of mesh creation is shown. The mesh quality (in term of elements number and elements shape) is important due to the solution accuracy and speed.
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Simulation of circuit-breaker trip unit
Dostál, Lukáš ; Augusta, Zbyněk (referee) ; Valenta, Jiří (advisor)
Securing of electrical devices is important not only to protect against destruction under the effects of electric current, but also for protection of people or animals against electric shock. With increasing of living standards goes hand in hand increasing of the electricity consumption. Therefore In the grid of low voltage, there are increasing short-circuit currents. With improving technology is posed considerable demand on the performance, security and switching capacity of circuit breakers. This thesis is oriented on development of thermal and electromagnetic switch of circuit breaker on which is put a big demand in development of new types of circuit breakers. The thesis is interesting because of comprehensive use of circuits’ breakers since it can be used in AC and DC networks with frequency of 50 Hz and 400 Hz.
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Simulation of phenomena in switchgears
Daševič, Ladislav ; Vávra, Zdeněk (referee) ; Valenta, Jiří (advisor)
Aim of the thesis is to explain the issue of forces acting in circuit breaker caused by magnetic fields induced by short-circuit current. This thesis is focused on force affecting in concrete system of a circuit breaker. The given circuit breaker is made by OEZ Letohrad, the type Modeion BD250. In the thesis the way of creating 3-D model is shown for the purpose of creating numeric simulation by ANSYS 11. The next approach of the thesis is the description of applicating the results for DC and AC current calculations. The noted calculation is made in the programme MATLAB 6.5. The solutions are mentioned at calculations both in the graphic form and numeric specifications. Visualisation was made by using GIF graphic system animation. The individual pictures processing was done in the programme UNLEAD GIF ANIMATOR 5.
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Air filtration methods
Valenta, Jiří ; Pech, Ondřej (referee) ; Hejčík, Jiří (advisor)
achelor thesis provides an overview of the methods used in industrial air filtration. The work consists of the 5 main parts of dry and wet mechanical separators, electric precipitators, fabric filters and filter media.
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Application of 7 habits by Stephen Covey in practice in company Green Ways
Belan, Vladimír ; Kašparová, Eva (advisor) ; Valenta, Jiří (referee)
Impulse to write master's thesis was effort to use knowledge from book "7 habits of highly effective people" by Stephen Covey in practice in company Green Ways. Experiment was chosen as method of research. The goal of master's thesis was verifying hypothesis that certain volume of (non)work activities should lead to better work results in concrete amount. Experimental stimulus as (non)work activities influenced experimental group (10 people from company Green Ways) but did not infulenced control group (another 10 people from company Green Ways). Research lasted from the 2nd September till 3rd November 2013. As conclusion it was realised that hypothesis was not confirmed. This certain volume of activities did not lead to supposed work results (quantitative results). As people from experimental group are concerned, side effect of research for them were different findings from (non)work topics (qualitative results of survey).
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Úpravy rostlin a jejich využití v historickém interiéru
Valenta, Jiří
The subject of this final thesis was to study the techniques used to extend the life of plants, in practice to test and evaluate them. The obtained material is used to design an arrangement for specific historical interiors of Znojmo castle. The third task was to measure the temperature and humidity in one of the rooms where the arrangememnt was placed. The thesis includes a supplement with photographs of plants preserved with various techniques and examples of period interiors with installed floral arrangaments.
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