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Efficiency improvement possibilities of single-phase line-start synchronous machines
Mareček, Šimon ; Klíma, Petr (referee) ; Lolová, Iveta (advisor)
With increase in consumption of electric energy there is also increase of cost related to operation of single-phase induction motors (SPIM), which are mostly used in household applications. This is the reason of focusing thesis to single-phase line-start permanent magnet synchronous machines (SPLSPMSM), which has higher initial costs but also higher efficiency so they have potential to replace single-phase induction motors. That is the reason why the first chapter presents a literary research focusing on the topic of induction machines. The next chapter is dedicated to literary research of used SPLSPMSM and deals not only with their construction but also with transient phenomenon and steady state. Readers will learn about most common used laying of permanent magnets in SPLSPMSM in the next section. Then there continues chapter with possibilities of synchronization increasing because it is an important phenomenon connected with this type of rotating machines. Mathematical model is present in the next section of thesis. There are written equations, which lead to creating an analytical model. An equally important part presents an electromagnetic model and his description, which follows right after mathematical model. There are summarized the most important parameters and their influence on the efficiency of SPLSPMSM in the last but one chapter. In the last chapter there is a comparison between the mathematical and electromagnetic model.
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Optimization of high-speed induction machine
Cajzl, Jakub ; Světlík, Martin (referee) ; Klíma, Petr (advisor)
This thesis deals with the multi-objective optimization of a high-speed asynchronous machine. The introduction is devoted to materials and losses in high speed asynchronous machines and comparison of basic rotor topologies. The next part of this thesis summarizes the basic information related to the optimization principles and the basic classification of optimization algorithms. Then the specific algorithms used in optimization problems are described in more detail. The main part of this thesis deals with proposals for increasing the efficiency of the original 2,5 kW high-speed asynchronous machine, which are verified by electromagnetic calculations. Furthermore, the optimization itself is already performed using the NSGA-II genetic algorithm created in Python. The optimization results are evaluated and the selected optimized models are compared with the initial and modified machine models. The efficiency of the 2,5 kW machine has been successfully increased mainly due to the radially slitted rotor with copper end-rings and the use of stator plates with lower core losses. By optimizing the machine geometry, the power factor was increased and winding and friction losses were reduced.
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Creation of GUI for optimization of electrical machines
Bártková, Tereza ; Klíma, Petr (referee) ; Knebl, Ladislav (advisor)
This work follows the development process of graphical user interface (GUI) spanning from choosing the right tools for implementation to the implementation itself. The purpose of the work was making the optimization program user-friendly by creating a communication layer between the optimization algorithm and the user and demonstrating its functions. First of all, the study of various programming languages and their toolkits regarding GUI programming was undertaken. Python was chosen because the original program is written in it, also software development in Python is probably the quickest one. Furthermore there are analyzed characteristics of this language and PyQt, which is a tool meant for GUI creation. The third chapter introduces very thoroughly the issues of electrical machines and their optimization. Introduction of these issues is followed by brief description of two optimization methods being used in electrical machines optimization. Following chapter introduces the actual machine under the optimization study, on which the final program was tested. Afterwards follows detailed description of application layout created in Qt Designer. New program structure enriched with graphical user interface is described and its functions are shown. Finally there is a guideline on how to use this program and the optimization is executed accordingly. Also, the results of the optimization are analyzed.
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Thermal analysis of servomotor
Přibyl, Daniel ; Duroň, Jiří (referee) ; Klíma, Petr (advisor)
This thesis deals with the design of the thermal model of servomotor in program Motor-CAD and using it for analyze of servomotor. In the beginning is a short familiarization about its parts, especially important for the thermal model. Further are described principles of heat exchange. There is a chapter, which is dedicated to the program support of the Motor-CAD. Thermal model and electromagnetic model inputs are tuned according to the measured data. Then a way of active cooling is designed and based of it the model in program is edited. Using the model is found the points of load of the motor for maximum allowable temperature with water cooling. In the conclusion is a valorization of benefit of water cooling for the servomotor.
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High-speed Condesing Steam Turbine
Klíma, Petr ; Trojan, Aleš (referee) ; Fiedler, Jan (advisor)
ith one controlled extraction and one uncontrolled extraction, calculation of the flow channel at all stage, design and calculation of the regulation valve and create connection diagram of steam turbine and air cooled condenser. At the beginning of this work is an overview of manufacturers of steam turbines and their unified products. Master thesis was developer with G-Team, a.s. as using calculations and the instructions given in the recommended literature with supporting CFD simulations to determine the loss coefficients and FEA simulations to determine the eigenfrequencies blades.
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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.
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Business Project
Rujbr, Lubomír ; Klíma, Petr (referee) ; Mandelík, Petr (advisor)
My diploma thesis is occupy by problems with business project. After determination basic notions which has connection with this thesis I make analysis internal and outer environment of company MMB Consulting, Ltd. and I propose business project building-up family houses in town Rosice u Brna for this company.
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A small three phase induction motor
Klíma, Petr ; Cipín, Radoslav (referee) ; Mach, Martin (advisor)
The main object of this bachelor thesis is to determine the parameters of the induction motor with an output of 155 W. Three ways of obtaining the parameters were chosen. Analytical calculation according to available literature, calculation in RMxprt program and laboratory measurement of the motor. For a better comparison of analytical calculations, two literary sources were chosen according to which the calculation was performed. Individual calculations and values obtained by them are included in the thesis. A comparison of the results obtained by individual methods is performed.
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High-speed induction machine
Cajzl, Jakub ; Pribulla, Daniel (referee) ; Klíma, Petr (advisor)
This thesis deals with the electromagnetic design of high-speed asynchronous machine. The introduction summarizes basic information that deals with design aspects of highspeed machines and choice of materials. The next part of this thesis is focused on the comparison of basic rotor topologies for high-speed asynchronous machines. The main part of this thesis is devoted to the electromagnetic design of high-speed machine and parametric analysis. In this part, the results of machine basic dimensions and parametric analysis are presented.
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