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Assessment and evaluation of safety in power. machines
Hromek, Lukáš ; Janda, Marcel (referee) ; Veselka, František (advisor)
This thesis is focused on the security and improving of electrical rotating machines service life, especially asynchronous motors. Work includes a description of the most common disorders, short description of the asynchronous motor cage casting, analysis of provided decommissioned motors with photo documentation. The last part of this thesis is focused to vibrodiagnostic of asynchronous motor with simulated imbalance and motor emplacement by laser.
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Problems of measurement and evaluation of switching loop impedance
Švéda, Miroslav ; Bárta, Jan (referee) ; Veselka, František (advisor)
This work is applied to questions about impedance of tripping loop. It deals with problems of measuring impedance of tripping loop, different measurement, procedures and accuracy of these measurements. Further, the work deals with the subsequent evaluation of the measuring impedance of tripping loop and writing of the measurement results. The work also focuses on the impedance of tripping loop in terms of the operation of the protective elements of the electrification system. Finally, the practical measurement of the impedance of tripping loop in real electrical circuits is performed as part of the work.
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The fuel pump improvement, possibilities and limitation
Novotný, Vladimír ; Veselka, František (referee) ; Bušov, Bohuslav (advisor)
This thesis deals with common rail injection systems used at diesel vehicles. It contains an overwiev of manufacturers common rail systems, their construction and differences. The second part contains a description of Bosch Common Rail electrical and electronic components, and described ways of pressure control. Last chapter summarizes the possibilities for development and improvement of some parts of the system in the future.
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The issue of revision of the electric sliding contact machines
Kozumplík, Miroslav ; Janda, Marcel (referee) ; Veselka, František (advisor)
This work is dealing with issue about revisions of electrical equipment with focused on sliding contact. The first time I will deal enumaration and simple desription the mainly machines which uses sliding contact. The next time i will deal legislation two of standard for revision and then I will write about basic procedures for work with microscope. The next time I will bring photographic documentation of samples of brushes and at the last the strengh test of brushes with results.
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Assessment of the design of the new solution sliding contact in electrical machines
Záhejský, Petr ; Mach, Martin (referee) ; Veselka, František (advisor)
The thesis is devoted to assessing the concept of a new solution to the sliding contact in electrical machines. The work is focused mainly on the issue of collector engines, which are almost exclusively used in electric hand tools. Much of the work is devoted to angle grinders, which are usually used in extreme conditions and demands for seamless operation are enormous. In order partial insight into the problems in the introduction are studied phenomena acting on the sliding contact, wear and durability. Then further materials and diagnostic methods for increasing the transfer efficiency brush - commutator brush - ring. The following sections of this thesis is also considered a proposal innovated brush along with the practical verification and evaluation of the suitability of the use of innovative sliding contact.
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