National Repository of Grey Literature 45 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Design of a Magnetic Bearing for an Electrical Machine
Rúra, Dávid ; Vítek, Ondřej (referee) ; Bárta, Jan (advisor)
The current development in the field of electric machinery is focusing on high-speed electric machines. This opens also other fields related to high-speed machines. One of them are magnetic bearing systems. Tradition approach of using ball bearing brings a few problems in design dealing with friction at high speeds. Together with magnetic bearings, development is their control. Faster chips opened a new way of thinking of control and helped to evolve robust control loops. The biggest advantage of magnetic bearing is non-friction run and almost no maintenance. Compare to traditional ball bearing, a magnetic bearing system needs more space and in some applications could happen that the shaft will be twice as long. This problem can be solved designing complex system with motor and integrated magnetic bearing what leads to downsizing. In this master thesis, the design of magnetic bearing for 12kw, 45000rpm is discussed. It focuses on practical design and correlations between parameter selection. The analytical approach is used to sketch the design and optimization is done afterwards. Problem with an analytical design is that it doesn't cover all parasitic phenomenae and thus numerical modelling snd optimization are demanded. Also, the critical speed analyze is included in this thesis. The results of the work will be used for manufacturing prototype as an extension to the existing high-speed machine.
Rotor design of a Line-Start Synchronous Reluctance Machine for Industrial Applications
Žíla, Jakub ; Knebl, Ladislav (referee) ; Bárta, Jan (advisor)
This diploma thesis deals with design of rotor of synchronous reluctance machines. There is a theoretical description of rotor geometry of synchronous reluctance machine that respects natural flow of magnetic flux inside complete rotor. The parametric model of rotor is made with usage of ANSYS Maxwell and Matlab software. Furthermore, the parameters of the machines are confirmed using the same program. Finally, changes of motor parameters are observed in connection with different rotor geometries.
Skin effect in high-speed electrical machines.
Klíma, Petr ; Bárta, Jan (referee) ; Mach, Martin (advisor)
This master thesis deals with the suppression of the skin and proximity effects in high-speed machines. The first part summarizes the general knowledge of high-speed machines. The second part is devoted to the principle and possible suppression of consequences caused by skin and proximity effects. The third part shows the simulation results of models of a synchronous machine with permanent magnets. The results of these simulations reveal the consequences of skin and proximity effects. In addition, design measures are proposed to limit these and other undesirable phenomena to achieve the highest possible efficiency.
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.
Electromagnetic calculation of an induction machine using an open source program
Bílek, Vladimír ; Mach, Martin (referee) ; Bárta, Jan (advisor)
This bachelor thesis deals with issues of finite element method and its use for electromagnetic calculation of induction machine. The first part of the thesis deals in details about finite elementh method, where the thesis describes the procedure of calculation of electromagnetic model and its use in simulation software. The second part contains and compares the list of paid and open-source simulation programs. The third part describes the creation of the specified electromagnetic model. The fourth part of thesis represents program ELMER, program's posibilites and how to set up scripts for simulation. The fifth part compares simulation results with measurments on real induction machine. The last part is the overall evalution of the thesis.
Development of speed skills and agility in ice hockey off - ice training for children
Bárta, Jan ; Jebavý, Radim (advisor) ; Vojta, Zdeněk (referee)
Title: Development of speed skills and agility in ice hockey off - ice training for children Objective: The aim of this bachelor thesis is to create battery of exercise suitable for development of speed skills and agility agility in ice hockey off - ice training for children. Methodology: It was used scientific method of observation - theoretical-empirical character. In the work was compared the results of 12 players from HC Hvězda Praha club, which was measured at the beginning and the end of summer preparation period. The results were compared using the Cohen's coefficient d, arithmetic mean and percent. Results: We have created the battery of exercises suitable for developing speed skills and agility in ice hockey off - ice preparation period for children. This battery comes from my own experience and from studying professional literature. Key words: ice hockey, speed skills, agility, younger school age, battery of exercices
The Eddy Current Losses of High-Speed Solid Rotor Induction Machine as Function of the Radial Air-Gap Lenght
Bárta, Jan
This paper introduces that the appropriately selected air-gap width have major impact in terms of efficiency for high-speed induction machines. Machine of interest is high-speed solid rotor cage induction machine intended for helium turbo-circulator. Proposed study is done from electromagnetic and thermal point of view. Presented results can be used as a guideline for air-gap length selection for others high-speed solid rotor induction machines.
Design of Interior Permanent Magnet Machine
Kuna, Kristián ; Mach, Martin (referee) ; Bárta, Jan (advisor)
For the development of synchronous machines with permanent magnets were essential the development of power electronics, improvement of the parameters, as well as the increase of the availability of permanent magnets. The purpose of this thesis is to compare the different rotor topologies in synchronous machines with inside permanent magnets and to develop the basic electromagnetic design of synchronous machine with inside permanent magnets.
Thermal calculation of electric motor with permanent magnets and squirrel cage
Homolová, Romana ; Bárta, Jan (referee) ; Toman, Marek (advisor)
In the first part, this project deals with the elaboration of a Line Start Permanent Magnet Synchronous Motor. Possible designs of the motor, used magnets and also its function are listed there. The next part of the project summarizes the theory of heat transfer needed to calculate the heating of rotating electric machines. The following section deals with the calculation of the heating of the motor using the method of thermal networks and a specific network for asynchronous motor is presented there. A newly designed rotor network of the Line Start Permanent Magnet Synchronous Motor is based on this network. To verify the functionality of the network, a calculation of the rotor temperature distribution was done in Ansys Workbench program. The designed thermal network of the whole motor and a verification of its functionality with the calculation from Ansys are presented in the last part of the project.
Design of Line-start synchronous machine
Lolová, Iveta ; Klíma, Jiří (referee) ; Bárta, Jan (advisor)
This thesis deals with line-start permanent magnet synchronous motor, because in these days the world focuses on energy saving more than ever. Line-start permanent magnet motors represents a possible replacement for asynchronous motors, which are the most used kind of motors and constitute one of the greatest energy consumption apparatuses in the world. The efficiency improvement of induction motors is usually achieved through design optimization of induction motors resulting in limited degrees of success. This thesis also thoroughly explains LSPMSM topology and compares properties of the line-start permanent magnet motors and asynchronous motors. This thesis deals with the design of line-start permanent magnet synchronous motor based on previously designed asynchronous motor. In the last chapter LSPMSM is investigated in RMxprt and Ansys Maxwell.

National Repository of Grey Literature : 45 records found   1 - 10nextend  jump to record:
See also: similar author names
7 Barta, Jiří
8 BÁRTA, Jakub
26 BÁRTA, Jan
1 Bárta, J.
8 Bárta, Jakub
1 Bárta, Jaroslav
1 Bárta, Jaroslav,
7 Bárta, Jiří
1 Bárta, Josef
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