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The use of optical methods in the diagnosis of electrical machines
Tobolák, Petr ; Kuchyňková, Hana (referee) ; Janda, Marcel (advisor)
This term describes questions of scanning rotors of asynchronous motors using 3D scanner. At the beginning it deals with a theory of asynchronous motors, defects of these machines and last but not least also questions of 3D scanning. Directly it focuses on a practical processing of measured rotors and their necessary modifications using of a program GEOMAGIC. It includes a diagnostic of deviations of scanning components of rotors with a model created on a program AUTODESK INVENTOR and posiible reasons of their creation.
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Optimization of the cooling of induction machines
Halfar, Ivo ; Dostál, Lukáš (referee) ; Janda, Marcel (advisor)
This master‘s thesis deals with problems of optimization of cooling in electrical machines. This work includes introduction to the theory of mathematical optimization and brief introduction to optimization problems. This thesis deals with using of program Ansys Workbench for the thermal analysis in electrical machines and optimization of their cooling. Thesis contains thermal analyse of specific asynchronous motor with the squirrel cage and optimization of its cooling.
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Structural analysis of part of electrical machine
Fodor, Viktor ; Hájek, Vítězslav (referee) ; Janda, Marcel (advisor)
This thesis discusses the optical diagnostics of electrical motor parts using a 3D scanner. It describes the construction of electrical induction motors, their heat losses, cooling and refrigeration systems that may be used by such motors. It approaches the possibilities of heat recording and briefly explains the 3D scanner’s principal. It also introduces the simulation program ANSYS which uses the finite element method. This thesis shows the post processing of the digitalized object and the simulations and compares the simulation and measurement results. The final part is devoted to the analysis of the obtained results.
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The new modelling facilities at parametric CAD programme
Sedláčková, Petra ; Janda, Marcel (referee) ; Kuchyňková, Hana (advisor)
This bachelor’s thesis describes Autodesk Inventor Professional 2008 and Ansys Workbench. The main aim is familiarization with user interface and working routine in these programs and their cooperation. In part about Autodesk Inventor there is summarized the advantage of parametric modeling against traditional techniques. Also there is described Inventor studio, in which is created an animation of model created in Autodesk Inventor. In the concrete it is animation of model of one phase asynchronous motor with outer rotor. In Ansys Workbench 11.0 there is created transient thermal analysis of one phase asynchronous motor. The aim of this analysis is to try the work in Ansys Workbench from importation of model, from external CAD system, to evaluation of results.
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Vibrodiagnostics of electrical machines
Boháček, Daniel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This thesis deals with methods of vibration analysis in electric rotating machines. From the beginning, it is necessary to explain the basic concepts and introduce the issue of vibration. Next time, the work is focused on sources of vibration in electrical machines. Defects on electric rotating machines causing vibrations are described. Sensing is performed using sensors of deflection, speed and acceleration. The measured signal needs to be adjusted and filters, approximations and sampling will cover this in the next chapter. The main objective is the methods of analysis, which include the best known in the field of frequency analysis (FFT) and the envelope method in the time domain. This includes other methods such as Kurtosis factor, Crest factor, etc. There is also a basic block diagram for measuring vibrations. This block diagram is programmed and has a graphical user interface. The last part is an evaluation of the measured data of the engines.
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3f. inverter with drive control for drill press
Grom, Martin ; Vašíček, Adam (referee) ; Procházka, Petr (advisor)
Bachelor thesis deals with the design and implementation of a three-phase converter designed for driving an electric drill with asynchronous motor. Converter is designed using a specialized integrated control circuit and transistor power module. The thesis also contains description of the induction motor control, description of the inverter internal operation, functions of integrated circuits, overall design description and design of the printed circuit board. The proposed device has been built and tested. The test measurements were done on a working sample of the converter.
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Control of asynchronous motor
Semerád, Jiří ; Pazdera, Ivo (referee) ; Běloušek, Josef (advisor)
The thesis is focused on asynchronous motors. The first part deals with construction, principles of function and speed-torque characteristics of the motors. Furthermore, a mathematical model of an asynchronous motor in Matlab-Simulink program is created in order to make a possibility to test any type of motor and check all parameters, which is more economical than testing real objects. The second part of the work contains an overall summary of asynchronous motor control methods.
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