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DC machine measurement and analysis using LabView
Loun, Lukáš ; Hájek, Vítězslav (referee) ; Vítek, Ondřej (advisor)
The virtual laboratory is divided into two groups. The first group is comprised of a virtual laboratory for simulation. It is mostly used for presentation and demonstration purposes. It is not necessary to install complicated and expensive software for their use. The second group of the virtual laboratory is a long distance measure. Real systems are measured with the help of this laboratory. The advantage of long distance measuring is that data from the measurements are saved directly onto the personal computer and they can be immediately evaluated. In this project the procedure for creating a virtual instrument for long distance measuring is described in the LabVIEW program. LabVIEW is a graphic developmental environment, for the measuring and analysis of data.
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Electronically commutated motor
Vykopal, Petr ; Melichar, Petr (referee) ; Vítek, Ondřej (advisor)
The main idea that lead to the development of EC (electronic commutation) motors is to remove from commutation motors, called DC (direct current) motors, the mechanical commutation system i.e. the cylinder brushes and the commutator that limits in most of the applications the longevity of direct current motors. The commutator is the source of electromagnetic interference and it limits the motor speed. At the same time it is required to keep the outstanding features of DC motors, mainly the multiple overload capacity, high starting torque, low time constant and small dimensions. Thesis introduces the problematic of electrically switched machines and their possible construction versions. Based on obtained findings there is performed an analytical calculation of EC-machine with classical stator (made with two grooves on pole and phase) and with segmental stator for given parameters. With the known parameters of the machines from personal design there were created models of both machine types, and the results obtained from the program FEMM were compared to those of analytical calculations.
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Physical Fields Modelling of EC Motor's
Kružík, Pavel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This thesis concludes a description of construction and functions of Electronically commutated motors. The main target is modelling of thermal field of Electronically commutated motors. For modelling was chosen Ansys Workbench setting with CAD geometry. There was a measurement for verifying result of simulation, and its proof is described in my thesis. This project also concludes comparison of results from simulation itself and results obtained from measuring thermal profile of EC motor.
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Agricultural insurance
Vítek, Ondřej ; Ducháčková, Eva (advisor) ; Daňhel, Jaroslav (referee)
This thesis deals with risks threatening agricultural activity, with agricultural insurance and with state aid to agricultural insurance in the Czech Republic. Furthermore, it describes history and development of agricultural insurance in the Czech Republic. Under this chapter is explored dependence of the premium on selected factors. The attention is also paid to agricultural insurance schemes in 16 selected countries of the world. Consequently, there are proposed possible suggestions of improvement of current agricultural insurance system in the Czech Republic with regard to foreign practice. The supply of crop insurance including a practical example of farmer using crop insurance in his risk management is concisely described in the end of the thesis.
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Analysis of agricultural insurance in the Czech Republic
Vítek, Ondřej ; Daňhel, Jaroslav (advisor)
This bachelor thesis deals with the agricultural insurance in the Czech Republic. The first part of this thesis is devoted to the description of agricultural insurance, the risks to agricultural activity including possibilities for their reduction or elimination. Furthermore, it describes the state support for agricultural insurance. The second part of this thesis analyzes the development of agricultural insurace in the Czech Republic. The agricultural insurance products of individual insurers are described in the final part of this thesis.
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