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Axial magnetic flux electric machine
Lacina, David ; Bárta, Jan (referee) ; Huzlík, Rostislav (advisor)
This thesis deals with axial flux permanent magnet machines. It is divided into four parts. The first one describes how axial-flux machines can be categorized. It also explains basic construction designs and their properties. Second part focuses on designing axial-flux machine. The analytical calculation of the machine is then checked using finite element method in software Ansys Maxwell. In the last part the calculations are also checked by measurement of an actual axial flux machine. In the summary is a comparison of analytical calculation, simulation and measuring.
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Analysis of a fault tolerant electrical machine
Němec, Josef ; Rúra, Dávid (referee) ; Bárta, Jan (advisor)
This bachelor's thesis deals with fault-tolerant machines. The basic principles which increase the fault-tolerant capabilities and some of the designed fault-tolerant machines have been presented in the first chapter. These machines have been compared in the second chapter and their advantages and disadvantages have been presented. The third chapter deals with three basic methods used to analyse electrical machines. The last chapter deals with fault analysis of a three-phase synchronous machine with two independent power sources. The faults have been compensated so that the machine produces required torque. Furthermore, two methods for decreasing torque ripple have been proposed for compensated states with asymmetrical supply.
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Electromagnetic model of a line-start synchronous machine
Lípa, Miroslav ; Lolová, Iveta (referee) ; Bárta, Jan (advisor)
The main goal of the work was to compare two effective methods used for calculating the electric machine. The primary method uses an electromagnetic model made of a resistance network, which is compared to a finite element method using an Ansys Maxwell environment. The resistance network is calculated in the Python programming language. The work deals with a synchronous machine with permanent magnets that can be run directly from the source, because it contains the squirrel cage. Thus, at steady state, the machine achieves greater efficiency than the asynchronous machine. The first chapter describes the basic principles of a line-start synchronous machines, the second chapter shows the ways in which electrical machines can be modelled. The third chapter describes the derivation of the resistance network for the assigned machine, the whole electromagnetic design is given here. The fourth chapter shows the gradual calculation, describing the simplifications and problems that have arisen, it also shows a comparison with the finite element method.
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Design of 3 MW high-speed permanent magnet synchronous motor
Bořil, Michal ; Bárta, Jan (referee) ; Vítek, Ondřej (advisor)
The thesis theme is the design of 3 MW high-speed permanent magnet synchronous motor. The work is divided into several parts, and contains the information given on the topic. The first part lists trends and new technologies of high-speed electric machines, and the issues and construction of high-speed synchronous machines are also listed here. In the second part, the machine is analytically designed from the specified values, which is then modelled in the RMxprt program. In the penultimate part, the engine is simulated by programs that are included in the ANSYS Electronics Desktop package, they are RMxprt and Maxwell. The modified engine model in RMxprt is simulated using defined formulas and then converted to Maxwell 2D, where the engine is simulated using the finite element method. In the last part, the results from the analytical calculation are compared with other high-speed machines. In addition, the results of simulations from RMxprt and Maxwell were compared in the last part.
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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.
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Design and electromagnetic calculation of small power wound field synchronous machine
Laštovička, Josef ; Vítek, Ondřej (referee) ; Bárta, Jan (advisor)
The topic of this bachelor thesis is the issue of synchronous machines with a wound rotor and their design. The first part of the work summarizes the theory of synchronous machines with a wound rotor. A more detailed focus is given to salient pole machines. The second part summarizes specific steps in designing a machine with a wound rotor. The third part is to create a program for calculating a salient pole synchronous machine. The program is based on knowledge gained in the first and second parts using the Python programming language. The fourth part focuses on electromagnetic design, its optimalization, simulations and interpretation of their results. The last part contains technical production documentation and machine model.
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Islanding Detection
Bárta, Jan ; Ptáček, Michal (referee) ; Kopička, Marek (advisor)
The bachelor thesis discusses islanding in electric power system and various methods for its detection. The thesis contains a list and description of legislation concerned with islanding, description of few selected islanding detection methods, and their comparison. The practical part of the thesis consists of simulations of several detection methods performed in the virtual environment of PSCAD and their evaluation.
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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.
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Design and optimalisation of synchronous reluctance machine
Bárta, Jan ; Vítek, Ondřej (referee) ; Ondrůšek, Čestmír (advisor)
This theses is related to design of synchronous reluctance motors of the transverse-laminated type. The first part describes synchronous reluctance machine via space-vector theory. Furthermore this part briefly discuss the main design aspects of synchronous reluctance machines. The main part of this thesis is related to practical electromagnetic rotor design for synchronous reluctance machine by means of finite element method. On this base the rotor has been fabricated and placed inside of induction motor instead of his original rotor. On this prototype was made several measurements which were compared with results from finite element method analysis. The last part of this theses is related to short study of synchronous reluctance machine dynamical behaviour under scalar and vector control.
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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.
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