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Design and analysis of electromagnet
Macek, Pavel ; Skalka, Miroslav (referee) ; Vítek, Ondřej (advisor)
This work deals with a proposal and an analysis of electromagnets. The first chapter is an introduction into solve of the problem. In the second chapter there is a general discussion about basic relations of the electromagnetic field. The third chapter is dedicated to the operation principle and construction of electromagnets and is supplemented with their common classification. The fourth chapter introduces the Finite Element Method and the FEMM programm. The fifth chapter is dedicated to the analysis of the DC electromagnet, the sixth chapter analysis single-phase AC electromagnet. In the seventh chapter there is a review of results of general analysis of both electromagnets.
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Design of Vibration Energy Harvester with Using of Non-linear Characteristics
Rubeš, Ondřej ; Ondrůšek, Čestmír (referee) ; Hadaš, Zdeněk (advisor)
This thesis is focused on design of piezoelectric energy harvester with additional nonlinear stiffness. Linear generator has very narrow resonance frequency bandwidth. It makes the resonance mechanism very sensitive to tuning up of the resonance frequency and it can be tuned only for one narrow vibration peak. The main idea for using of the vibration energy harvester with nonlinear stiffness is to make resonance frequency bandwidth wider, so the generator will be useable for more excitation frequencies. In this thesis is used generator Midé V21BL and additional nonlinear stiffness is realized with permanent magnets.
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Trackside vibration energy harvester
Beňo, Martin ; Sosna, Petr (referee) ; Rubeš, Ondřej (advisor)
This diploma thesis is about the design of a vibrating energy harvester for a railway track. The railways are constantly being innovated and require a large number of sensors to achieve a high level of security and predictive maintenance. Such sensors need to be powered by a certain power source. A conventional energy source could be replaced by a vibrating energy harvester. The work discusses not only the analysis of suitable parameters, but also the realization of the energy harvester. At the end of the work, a functional concept is presented and the proven results are also taken into account.
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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 synchronous motor
Žák, Ondřej ; Mach, Martin (referee) ; Vítek, Ondřej (advisor)
The thesis describes problematics of synchronous motor with permanent magnets. The design is provided by analytic and empiric procedures. The great accent is placed on the description of the magnetic circuit of the motor. The finite element method analysis of designed motor is performed subsequently. The main target of this thesis is to find the way, how the ferrite permanent magnet should be used in synchronous motor.
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Optimization of magnetic circuit of induction motor for frequency up to 210 Hz
Binek, Martin ; Cipín, Radoslav (referee) ; Vítek, Ondřej (advisor)
This master’s thesis first deals with the theory concerning induction motor. It briefly desbribes the construction of three-phase induction motors, the generation of tractive force, power flow with loss distribution and also torque characteristic. In the next part an analytical calculation of the parameters of equivalent circuit for an existing induction motor with known dimensions is performed. After the calculation it is possible to find out the rated parameters of the motor, which makes it possible to further compare results with the values obtained by other methods. The next step was to create a model of the motor in RMxprt program, which is later also translated to ANSYS Maxwell 2D model. Simulations were carried out in both interfaces. As the next step the results obtained by the three methods are compared with measured values and also evaluated. The final part of the thesis focuses on the optimization of the magnetic circuit for higher frequencies. Efficiency of the modified induction motor is examined for higher frequencies using RMxprt Optimetrics and this procedure is performed for both default and alternative electrical steel materials.
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Analysis of core loss of a small induction machine
Plíšek, Oldřich ; Cipín, Radoslav (referee) ; Mach, Martin (advisor)
The aim of this master´s thesis is to analyze core losses of a small induction motor. Analyzed values are obtained from laboratory measurements, software analysis and 2D finite element method simulation. The theoretical part of this thesis consists of two parts. The analysis of the higher spatial harmonics presents in the induction motor and the analysis of core losses of the motor. Practical part consists of laboratory measurements according to ČSN. Measured values are used to calculate individual losses. The next part consists of creating a model for software analysis (Maxwell RMxprt). The generated model is converted into a 2D simulation environment (Maxwell 2D), where it is adapted to obtain values from the examined parts (rotor and stator teeth and rotor cage). Results of simulations at different loads are compared and analyzed from the point of view of higher harmonics.
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Analysis of steel grade influence on small induction machine efficiency
Plíšek, Oldřich ; Klíma, Jiří (referee) ; Mach, Martin (advisor)
The theoretical part of the bechelors thesis examining the impact of the material of the magnetic circuit on the efficiency of induction motors is devoted to analysis of the induction motor and its losses. It also describes the measuring, including calculations of individual losses. Another theoretical part examines the impact of specific losses on the magnetization characteristics of assessed laminations. The practical part includes laboratory measurements of single phase and three phase motors ATAS Electromotory Náchod brand with multiple types of laminations. Measured values are used to calculate individual losses, which are later mutually compared. Models of measured motors with multiple types of laminations are simulated with the aid of ANSYS Maxwell RMxprt program. Analysis of engines with specific types of laminations are performed with the aid of analytical calculations. Results of calculations are compared with simulated and measured values.
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Design of Vibration Energy Harvester with Using of Non-linear Characteristics
Rubeš, Ondřej ; Ondrůšek, Čestmír (referee) ; Hadaš, Zdeněk (advisor)
This thesis is focused on design of piezoelectric energy harvester with additional nonlinear stiffness. Linear generator has very narrow resonance frequency bandwidth. It makes the resonance mechanism very sensitive to tuning up of the resonance frequency and it can be tuned only for one narrow vibration peak. The main idea for using of the vibration energy harvester with nonlinear stiffness is to make resonance frequency bandwidth wider, so the generator will be useable for more excitation frequencies. In this thesis is used generator Midé V21BL and additional nonlinear stiffness is realized with permanent magnets.
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Design and analysis of electromagnet
Macek, Pavel ; Skalka, Miroslav (referee) ; Vítek, Ondřej (advisor)
This work deals with a proposal and an analysis of electromagnets. The first chapter is an introduction into solve of the problem. In the second chapter there is a general discussion about basic relations of the electromagnetic field. The third chapter is dedicated to the operation principle and construction of electromagnets and is supplemented with their common classification. The fourth chapter introduces the Finite Element Method and the FEMM programm. The fifth chapter is dedicated to the analysis of the DC electromagnet, the sixth chapter analysis single-phase AC electromagnet. In the seventh chapter there is a review of results of general analysis of both electromagnets.
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