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Design of permanent magnet synchronous motors
Bureš, Petr ; Cipín, Radoslav (referee) ; Vítek, Ondřej (advisor)
Given today’s trend with environment being very important, there has been an ongoing attempt in the rotating machine industry to create machines with highest efficiency possible. And so, permanent magnet synchronous machines represent types of machine with very high efficiency and are gradually replacing other machines in many applications. This work deals with familiarization of the properties of permanent magnet synchronous motor as well as typical design choices. The main focus of this work is the design of permanent magnet EC motor and following comparison of results obtained from analytical design and analysis in the RMxprt program. Finally, the results of design methods are compared.
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The optimum supply of a wound-rotor synchronous machine with respect to maximum efficiency
Laštovička, Josef ; Cipín, Radoslav (referee) ; Bárta, Jan (advisor)
Tato diplomová práce se zabývá literární rešerší elektromotorů, které je možné použít pro pohon elektrických vozidel, přičemž hlavní pozornost je věnována strojům s vinutým rotorem. Na začátek je proveden krátký popis konstrukce a principu činnosti každého vhodného typu elektrického stroje. Jsou zde shrnuty výhody a nevýhody použití stroje jako trakčního pohonu a případné použití v dnešním elektromobilu včetně základních specifikací. Dále je věnován detailnější pohled na stroj s vinutým rotorem a jeho použití pro pohon elektrických vozidel. Následná část práce se věnuje úpravám tohoto typu stroje pro použití v trakčních aplikacích. Je zde představen stroj, který je schopen provozu ve dvou módech, následně je diskutován bezkontaktní přenos proudu do rotorového vinutí a nakonec je představena možnost použití tvarovaného vinutí z vodičů obdélníkového průřezu. Předposlední část práce se zabývá matematickým popisem stroje včetně náhradních schémat v podélné a příčné ose a vysvětlením vektorového diagramu v motorickém režimu. V posledních dvou kapitolách práce je představen program v jazyce Python, který slouží k analýze provozních charakteristik stroje. V rámci práce na programu byla vytvořena metodika analýzy tohoto typu stroje na základě poskytnutého balíčku dat. Dále byly vyexportovány grafické závislosti momentu a účinnosti na různých kombinacích vstupních proudů. Součástí programu je také funkce pro hledání optimálního napájení stroje s ohledem na nejvyšší účinnost.
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Analysis of concentrated windings of PMSM
Menoušek, Lukáš ; Cipín, Radoslav (referee) ; Vítek, Ondřej (advisor)
This thesis deals with the design, principles of permanent magnet synchronous machines and an analysis of their properties. As part of the work is done familiarization with the materials of permanent magnets and their arrangement, as well as construction of the engine where they are discussed types of winding machine configuration, types of motors with permanent magnets and the list of implemented solutions. In the next section of this paper is an analysis of the properties of selected types of concentrated winding with a focus on the emergence of harmonics. These data are compared with the model of the engine in the FEMM. Furthermore, a comparison of the calculations of these types of engines and their simulation in RMxprt.
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Garage door drive with idnuction machine
Lažek, Tomáš ; Cipín, Radoslav (referee) ; Pazdera, Ivo (advisor)
This thesis deals with a design of an electrical drive for a sliding side door. Goal of the thesis is to design of a frequency converter for an asynchronous motor with a gearbox. In the first part, the power supply for the freqency converter is solved in form of a single phase rectifier. Power section is solved by an integrated module IKC10H60GA manofactured by Infineon. The control board is provided with circuits for communication between the processor and the power section. Auxiliary power supply is designed as a fly - back converter. The drive of the converter is realized by STM32 Nucleo - 64 board. The design of the converter and drive algorithm are described in detail.
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Simulation of electroporation process in stent oclussion therapy
Hemzal, Martin ; Cipín, Radoslav (referee) ; Novotná, Veronika (advisor)
This masteral thesis describes phenomenon of electroporation and it’s use to deal with occluded self-expandable metalic stent. Thesis briefly summarizes theory of electroporation, currently used medical treatments of occluded stents. The next part of the thesis is dedicated to current state of mathematical simulations of electroporation. The core of the thesis are simulations of electroporation effects on tissue of occluded metal stents.
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Li-ion battery model
Loucký, Vojtěch ; Toman, Marek (referee) ; Cipín, Radoslav (advisor)
This diploma thesis deals with description of the principle of Li-ion cells, literature search on the topic of mathematical models of Li-ion cells and the creation of a selected mathematical model in MATLAB, which is able to simulate the course of voltage and state of charge as a function of time for different ambient conditions, such as various aging of battery .The creation of both the model and the procedure of identification of parameters necessary for the creation of the model are described here as well as different options of identification of parameters. The selected Thevenin model is then compared with the real course and the accuracy of the model is evaluated with respect to the measured course.
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Minimizing induction motor losses
Trn, Ondřej ; Cipín, Radoslav (referee) ; Vítek, Ondřej (advisor)
This bachelor thesis is aimed at reducing losses of three-phase induction motor. The first part deals with the construction and principle of engine operation. Another part of the thesis is focused on the calculation of asynchronous motor parameters according to technical documentation. Subsequently, the calculated parameters are verified using the Ansys RMxprt program. The third part of the thesis is focused on the detection of losses from the motor measurement. The last part focuses on engine adjustments to reduce losses.
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Database of material properties
Nagy, Gašpar ; Cipín, Radoslav (referee) ; Janda, Marcel (advisor)
This bachelor’s thesis focuses to create a database of the material properties and user interface for editing these properties. The first part of the project notifies us about the basic characteristics of materials. The next point talks about the materials which are used in electrical engineering to manufacture electrical machines and other appliances. The next part of the bachelor’s thesis describes the database design of material properties. The end of the thesis describes how to use the whole user interface and how it works.
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Substituting circuit of an induction machine
Běloušek, Radim ; Cipín, Radoslav (referee) ; Patočka, Miroslav (advisor)
Although induction motors are the simplest and most working reliability machines, is the identification of the parameters of their substituting circuit very difficult. There is solved the identification of the parameters of the substituting circuit in the T-network and ? –network in this work. The work also includes the proposal of magnetic circuit of the induction motor, the calculation of magnetizing and leakage inductances and resistances of the machine. The conclusion of the work is devoted to the sensitivity analysis of current and torque characteristics of induction motor upon the change of the single parameters of the substituting circuit.
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Influence of skin effect, proximity effect and air gap on winding losses of HF inductors and transformers
Pitner, Tomáš ; Cipín, Radoslav (referee) ; Martiš, Jan (advisor)
The bachelor's thesis deals with power losses in the windings of high-frequency inductors and transformers. A detailed mathematical and qualitative analysis of the skin effect, proximity effect and leakage flux of air gap is performed, supplemented with the results of computer simulations using the finite element method. The thesis introduces analytical and numerical methods for calculating power losses in the windings of inductors and transformers and describes suitable measurement methods, which are further used in the thesis. For selected geometries of inductors and transformers, AC resistances of their windings are calculated using FEM and the results are compared with measurements on constructed prototypes. The winding geometries are also compared between each other.
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