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Analysis of field current in synchronous machines
Kocman, Roman ; Mach, Martin (referee) ; Veselka, František (advisor)
This master’s thesis is focused on the analysis of the excitation current in synchronnous machines. Contains a description of excitation systems for synchronous machines, meaning and design of the sliding contact ant its representation in electrical machines. The main part of the work is focused on the evaluation of the field current of the three plants. The work includes graphic record of the excitation current of the hydroelectric power station Slapy, provided record from the power plant Opatovice was for evaluating load of turbo-generators. Provided record from the nuclear power plant Temelín was for evaluating.current division into individual brushes. The conclusion is a summary of the achieved knowledge.
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Diagnosis sliding contact using practical applications "Methods particulate"
Kopecký, Jiří ; Mach, Martin (referee) ; Veselka, František (advisor)
This thesis deals with the sliding contact of electrical machines and its diagnostic methods. Namely, the dust-particles method for assessing the length decrease of brushes is deeply described. Then, usage of the method in industry is described. The comparison of accuracy between manual version and new automated version of the method using computer analysis is presented. The final section is devoted to the practical verification of the new automated version which was developed especially for large machines. Measurements were performed on a small machine.
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Automotive Electric Motors Analysis and Innovation
Vala, Tomáš ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
Electric drives used in automotive industry are often based on standard DC motor as it is widely recognised as mature and reliable technology. The most common applications of DC motors in automotive industry are starters and wind screen wiper motors. Aim of this thesis is to provide design overview of typical automotive DC motor therefore main parts and features of the machine will be described in detail. Main disadvantage of DC motor is „sliding contact“ between commutator and carbon brushes which introduces source of electromagnetic disturbance and requires regular maintenance. Within this project different aspects of DC motor design and innovation are expected to be tackled including examples of loss calculation.
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Analysis and Optimisation Power Parameter of Small Induction Motors
Pařízek, Jiří ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This thesis deals with the asynchronous engines, describes their structure, principles, properties, use, and briefly describes the design of three-phase asynchronous motor. The first section describes the most common three-phase induction motor, the emergence of the rotating magnetic field and the basic relationships. The second part deals with asynchronous motors for specific applications, their design and features. The next section is an analysis engine borrowed from the electric company ATAS Náchod, and The last section lists ways to improve the basic parameters of induction motors designed and optimized engine.
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Bifurcation analysis of electric drive
Mach, Martin ; Vrba, Jaromír (referee) ; Koláčný, Josef (advisor)
This master thesis is deals with phenomenon of bifurcation in DC drive. It contains theoretical part, results of simulations and measurements of real DC drive in laboratory. The simulations was made in MATLAB, their results are bifurcation diagrams for different value of parameters. Target of measurement in laboratory was observed bifurcation on the real DC drive. Results of measurement are too transformed to bifurcation diagrams.
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Evaluation of performance of different size excavators
MACH, Milan
The aim of my thesis titled Evaluation of performance of different size excavators was to select five excavators ranked in different weight categories and subsequently to compare their actual performance. I monitored the actual length of one cycle on the basis of which the real performance of each excavator was determined. These results were mutually compared and summarized.
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The impact of the principal-agent problem on the genesis of the global financial crisis
Mach, Milan ; Žamberský, Pavel (advisor) ; Hnát, Pavel (referee)
The core focus of this thesis is the principal-agent problem and its role in the outbreak of the 2007 financial crisis. Analysis of key elements of the problem like moral hazard and adverse selection lays foundations for identifying situations, in which conflict of interests led to negative impacts on the economic performance before and during the financial crisis. This work also studies the influence of factors that are often overlooked by theoretical economists but are still tightly connected to the principal-agent problem, like exogenous incentives based on the mechanism of trust. The author also evaluates mechanisms that have been put into place after the financial crisis and which could help lower agency costs. He also sketches out possible venues of future research in this area.
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The analysis of regional unemployment in the Czech Republic from the perspective of the cohesion policy in the European Union
Mach, Martin ; Wokoun, René (advisor) ; Kouřilová, Jana (referee)
The aim of this diploma thesis is to characterize and judge, if the cohesion policy of the European Union really reflects regional differences of the unemployment in the Czech Republic. The theoretical part is oriented mainly on describing the unemployment from the perspective of the economic theory. The empirical part is focused on the development of the unemployment in the Czech Republic, and actual data are compared with the European Union. In this part is also the cohesion policy of the European Union generally introduced. After this follows the main chapter of this diploma thesis, which analyzes the unemployment in each region in the Czech Republic from the perspective of chosen indicators. The final chapter aims to answer the pointed goal of the thesis with the help of all available data.
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