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Contactless loading and measurement of high-speed machines
Vojče, Zbyněk ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
Práce se zabývá problematikou měření momentu u velmi vysokootáčkových strojů. Z důvodů vysokých rychlostí jsou tradiční metody měření momentu nepoužitelné, z tohoto důvodu je nutno vyvinout novou bezkontaktní metodu. Pro měření je zvolena metoda zatěžování vířivou brzdou, pro kterou je proveden analytický výpočet jejích vlastností pomocí Maxwellových rovnic a je vytvořen model vířivé brzdy v programu FEMM a Ansys/Maxwell 2D. Na závěr jsou výsledky simulací a výpočtů porovnány s měřením na prototypech brzdy.
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Safe brakes for servomotors
Štencl, Michal ; Duroň, Jiří (referee) ; Ondrůšek, Čestmír (advisor)
This Master thesis is focused on electromagnetic brakes for servomotors. In the first chapter is described principle of operation, later then design and main parameters are explained. The main part of thesis is focused on calculation of dynamic parameters of electromagnetic brakes. Calculations are solved first by analytic method in Matlab–Simulink, then by finite element analysis. Results are compared with measurements on prototype brake.
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Design of permanent magnet synchronous machine
Blaha, Jan ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
Nowadays in the area of drives, classical direct current machines are replaced for reason of low efficiency and low service life their frictional part by synchronous permanent magnet machines, among that belongs brushless or electronically commutated machines. This machines provide benefits of fine and effective regulation with no limits incurrenced by mechanical parts. Within this work, introduction with properties and construction of various types synchronous machines witch permanent magnets are performed, further the analytical calculation of design are made with effort to the best configuration for requisite characteristics. This design is compared with simulation made by computer technique and in the next step modifications of individual parts and choosen parameters for maximizing efficiency and minimizing volume are made. Comparison of success changes in design is made by simulation in program RMXprt again and the final machine is compared with original design, benefits of changes within efficiency and with considering of quantity used material are evaluated and his charakteristics are checked by Finite Element Method.
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Optimalization of Parameters of Asynchronous Motor
Hussain Mohammed, Mohammed ; Singule, Vladislav (referee) ; Voženílek, Petr (referee) ; Ondrůšek, Čestmír (advisor)
The doctoral thesis is divided into two main parts.The first part deals with optimalization of the equivalent circuit parameters of induction motor for calculation steady state characteristics:- - of the equivalent circuit parameters of induction motor with normal slots. - of the equivalent circuit parameters of induction motor with deep slots. -simulation of selected chracteristics and comparison with measured values. The second part of this work deals with optimalization of the equivalent circuit parameters of induction motor for calculation of dynamic characteristics of induction motor –simulation of selected chracteristics and comparison with measured values. The optimalization is based on mutual comparison of measured and calculated torque-speed and current-speed characteristics.
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Rotor Slot Shape Optimization of an Induction Machine
Szekeres, Vojtech ; Ondrůšek, Čestmír (referee) ; Bárta, Jan (advisor)
This thesis is dealing with optimization by using artificial intelligence of an induction machine rotor slot. The one optimized is commonly manufactured induction motor with simple deep bar rotor. Goal is to design an optimization method and achieve the highest possible value of efficiency and power factor of chosen machine. Work contains the parametric model construction in Ansys Maxwell software, the optimization algorithm assembly and its setup for desirable output, and processing of the results.
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Electromagnetic damper
Mikyska, Jan ; Huzlík, Rostislav (referee) ; Ondrůšek, Čestmír (advisor)
The main task of this bachelor´s thesis is the selection of structural design of electromagnetic damper with Halbach array to achieve the maximum output voltage for charging batteries. The thesis also contains a selection of specific design of damper from patent searches, simulations of magnetic induction in different versions of dampers in software Ansoft Maxwell, calculation of the induced voltage in an air coils and selection of the best 3D model of damper.
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The stress and modal analysis in parametric adaptive CAD programs
Sedláček, Petr ; Ondrůšek, Čestmír (referee) ; Kuchyňková, Hana (advisor)
This thesis is focusing on the use of the finite element method (FEM) in program environment of Autodesk Inventor Professional (AIP) 2010. For the analysis of the components or assemblies with FEM serves the Strength analysis module of the AIP 2010, whose environment and functions are detailed in this thesis. At the conclusion practical examples of modal and static analysis on the synchronous generator rotor model are demonstrated including a brief evaluation of the results.
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The improvement of efficiency of three-phase induction motors
Vinkler, Stanislav ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This work is dedicated to increasing the effectiveness of a particular draft induction motor, which was before the change and subjected to laboratory measurements according to EN60034 - 2-1, an analytical calculation of the losses and the overall efficiency and analysis program RMxprt. The first part focuses on the analysis of measurement data, measurement of partial loss in the machine and overall efficiency. In the second chapter, losses and efficiency calculated analytically, in the first case using the links in the professional literature dealing with the design of electric motors and in the second case by a program for the rapid design of rotating electrical machines, RMxprt program. At the end of this chapter all parameters are obtained measurements and calculations are compared. The third chapter is devoted to the calculation of losses and the resulting efficiency machines in a computer program, in which I gradually adopted changes to increase the efficiency of electrical machines. It also shows the calculation of the new dimensions of the stator and rotor slots. In the fourth chapter, the preparation of documentation for the production of a new two-layer winding for the current machine, while preserving the original dimensions of stator slots. The last part is devoted to the analysis of measurement data on the supplied asynchronous motor with a newly designed stator winding. In conclusion then discussed the results of work.
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Flux switching electric machine
Szabó, Hugo ; Klíma, Petr (referee) ; Ondrůšek, Čestmír (advisor)
The goal of this thesis is to create a literature search about a rotating electrical machine with switching of magnetic flux, to explain its construction concept and its operating behavior, to create an initial concept of generator, calculate chosen construction with finite element method analysis and to compare analysis results with analytical design. To create a concept of the generator one of available designing procedures will be used.
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Design of high-speed induction motor
Svoreň, Jan ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This work deal with troubleshooting of problem parts of high-speed induction machines. Introduction is about conception of induction machines with reference to construction specialities due to high rpm and because machines are fed by inverter. Next part is focused to design problems. A classical induction machine was measured to determination change of various losses in classic and high-speed induction machines. The computation of laboratory sample high-speed motor was specified for calculation of effective resistance and leakage reactance of solid-steel rotor with copper layer. The results of numerical calculation were validated by using finite elements method and machine design was adjusted for improving operation characteristic.
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