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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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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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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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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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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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Measuring RLC on the components of electrical circuits
Pokorný, Marek ; Vítek, Ondřej (referee) ; Veselka, František (advisor)
Aim those work is inform numerator about possibilities and features gauging apparatus 7600 Precision LCR undergrounds and further then about metering paramers R,L,C on components electric standing ,especially then on sliding contacts,with which this work acquaint and how are their characteristics important for correct functionality electrical machine whereof are site rated power.Warp work largely start from manual to apparatus 7600 Precision LCR undergrounds and further then out publication sliding contact in electrical machine - doc. Veselka, doc. Chmelik.
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Utilization of SolidWorks at power electrical engineering
Fazekas, Tamás ; Mikulčík, Aleš (referee) ; Veselka, František (advisor)
The purpose of the bachelor thesis was to became familiar with parametric CAD systems and create a simple model in high power electronics branch. The first part of the project summarizes the most known CAD systems. The second part deals with a specifics software:SolidWorks 2008. Finally, a simple model has been created in Solidworks 2008 from the power electronics branch. It is a model of an electric machine which is suitable for the research of the sliding contact.
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