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Microscope and it´s use in engineering practice
Kopecký, Jiří ; Dostál, Lukáš (referee) ; Veselka, František (advisor)
This work deals with the use of the light microscope in industry and its use within the automatization of the diagnostic method specialized on electrical machines with a sliding contact. The method is called the dust particles method and it is used to determine the loss of the brushes used in the machines. The current method involves a manual evaluation of an acquired data, which demands additional tests and the evaluation itself is very difficult. The objective of this work is to simplify and accelerate the method using the computer analysis. First, the usage of the light microscope, through which the samples are obtained, is showed. The method uses these samples as the input. Then, the principles of the dust particles method are demonstrated and the image analysis using the MATLAB program follows. The guide to the image analysis with the elimination of rising defects using the MATLAB program is available. Then, the volume of the intercepted dust particles is calculated using the MATLAB program. The dust particles were obtained from the LFC 55h brush using the Arsenal LPT 1513 – T light microscope.
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Design of a measuring device for the study of sliding contact
Havliš, Petr ; Hájek, Vítězslav (referee) ; Veselka, František (advisor)
Subject master´s thesis is design of a measuring device for the study of sliding contact. It including description sliding contact, its importance and application possibilities. Specification of examination possibilities of sliding contact, indicate the possibilities of evaluating the measured results. Design a stationary measuring device for long-term tests of the sliding contact and verify its the basic system concept. Master´s thesis including too elektronic make graphes with courses quantity on real machine.
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INNOVATION ANGLE GRINDER
Záhejský, Petr ; Janda, Marcel (referee) ; Veselka, František (advisor)
This thesis deals with the innovation of angle grinder and with upgrades of operating parameters, particularly the sliding contact. We count the angle grinders among electric hand tools, which are usually used in hard conditions. In the first time the non-functional examples of angle grinders were studied and their defects and the samples of dust were analysed. The aim of the other parts of this thesis was to measure the basic parameters of angle grinders, mainly the behavior of the comutator lamination. The following part is focused on application of teflon into the sliding contact, summarizes the behavior of the sliding contact with the presence of teflon, and describes the basic properties of teflon. The conclusion describes the practical application of teflon on the sliding contact, which is supported by long-term tests.
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The design of DC motors for traction of a motorboat
Hudák, Ondřej ; Lapčík, Josef (referee) ; Veselka, František (advisor)
The bachelor thesis deals with the problems of design of Permanent Magnet DC Motor. The theoretical part explains the problems of sliding contact and solves the innovation in this area with specialization on the sliding contact of DC motor. The other part contains practical verification of theoretical assumptions on the selected machine of normal production.
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Sliding contact in electrical machine
Bernard, Ivo ; Skalka, Miroslav (referee) ; Veselka, František (advisor)
The work deals with the sliding contact of electrical machines. The work is focused on individual components of sliding contact and the evaluation qualitative criterions of certain components of sliding contact. In the final section is presented a comparative method that has been designed for large machines. In this work we used this method on a small machine.
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Automotive Electric Motors Analysis and Innovation
Špaček, Ladislav ; Grmela, Petr (referee) ; Hájek, Vítězslav (advisor)
Direct current motors and stepping motors are very often used for electric drives in cars. The most frequent representatives of direct current motors are electric starter and wind- screen wiper motor. Stepping motors are very often used for electric regulating of outsides driving mirrors and seats. This study is focused on innovation and DC permanent magnet motor. The disadvanage of direct current motors is so called „sliding contact“. A possible compensation of direct current motor are EC (electronically commutator) motors that do not need sliding contact for their work.
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Possibilities of elimination of electrostatic charge generation in the belt conveyor drive
Pavluš, Ondřej ; Mach, Martin (referee) ; Veselka, František (advisor)
The purpose of revision of electrical devices is to assess the device in regard to its safety. The main goal of this bachelor thesis is a revision of an electrical conveyor belt engine. We focus on safety from injury caused by electric current due to malfunction and methods for detection and prevention of electrostatic charge buildup. We conducted an inspection and prepared the required norms and measurements. After a careful analysis of results we determined, whether or not the device meets the safety requirements specified by the relevant industry norms. Based on the insights from the inspection, we took necessary precautions with regard to static electricity buildup.
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Possibilities of elimination of electrostatic charge generation in the belt conveyor drive
Pavluš, Ondřej ; Mach, Martin (referee) ; Veselka, František (advisor)
The purpose of revision of electrical devices is to assess the device in regard to its safety. The main goal of this bachelor thesis is a revision of an electrical conveyor belt engine. We focus on safety from injury caused by electric current due to malfunction and methods for detection and prevention of electrostatic charge buildup. We conducted an inspection and prepared the required norms and measurements. After a careful analysis of results we determined, whether or not the device meets the safety requirements specified by the relevant industry norms. Based on the insights from the inspection, we took necessary precautions with regard to static electricity buildup.
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