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Design of high speed induction motor 350kW, 40000r.p.m.
Karásek, Ladislav ; Vítek, Ondřej (referee) ; Ondrůšek, Čestmír (advisor)
This thesis deals with the problem of the high-speed electrical machines. In the introduction summary of the high-speed machines are discussed. Induction machine with squirrel cage winding and solid rotor is chosen as suitable solution for given requirements. The multiple types of designs of the induction machines with solid rotor and problematic areas are discussed. Main part of this thesis is an electromagnetic design of the machine with respect to mechanical stress. The designed machine is analyzed with the use of finite element method in ANSYS Mechanical and Maxwell software.
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FEM model and simulation of induction motor with pole-changing winding
Záškodný, Jiří ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This master thesis deals with calculations and simulations of multi-speed induction motors. In the first part, basic principle of these machines is described. Next, there are given three examples of pole-changing stator windings and their properties are analyzed (winding factors, magnetomotive force). Main part includes simulations and measuring of the specific motor, which is produced by company Siemens Mohelnice. This is the motor with 2/1 pole-changing in Y/YY connection. First, influence of skewed rotor slots on current and torque is analyzed. Next, parametres of motor from simulations are given and these results are compared to measured values.
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Thermal Calculation of Rotational Electrical Machines Using Thermal Network
Špérová, Alice ; Dědková, Jarmila (referee) ; Kremser, Andreas (referee) ; Kotrba,, Vít (referee) ; Ondrůšek, Čestmír (advisor)
Práce se zabývá konstrukcí a využitím tepelných sítí k simulaci oteplení elektrických motorů velkých výkonú. Po úvodu do termiky a teorie proudění je popsána konstrukce tří různých typů sítí pro odlišné ventilační schémata motoru. Dále jsou popsány optimalizační metody a jejich možnosti k tepelné optimalizaci motorů. Je vybrána a vysvělena Marquard-Levenbergova metoda a na konkrétním případě je vysvětleno její použití a výhody pro optimalizaci chlazení elektrického motoru. V závěru se práce zabývá také citlivostí teplotních sití na jednotlivé vstupní parametry, porovnáním simulací s měřenými výsledky a také vlivem teplotních závislosti jenotlivých prvků sítě.
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Small axial magnetic flux motor for pump
Lacina, David ; Ondrůšek, Čestmír (referee) ; Huzlík, Rostislav (advisor)
This thesis aims to design a motor with axial magnetic flux, which could be used as a direct propeller of heart replacement pump. It is divided into several parts, first of which deals with describing possible axial motors construction design. Next follows up the description of possible motor designs, from which the non-ferrous one was chosen. After that, an analytic calculation of motor’s properties is conducted. Calculated parameters are thereafter verified by software tools using finite element method. Finally, the whole motor was manufactured and had its parameters tested and verified.
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FEM Analysis of a Hybrid Synchronous Generator
Suchomel, Vít ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This work deals with calculation and design of synchronous salient pole generator and then the transformation from this machine into so-called hybrid synchronous machine is described. This diploma thesis is done for company Siemens Electric Machines s.r.o. in Drásov. This company provided their design of synchronous salient pole generator. The model of this generator was created in programs RMxprt and Maxwell 2D. Suggestions and models were compared, and their calculated parameters were evaluated. The created model was upgraded to so-called hybrid synchronous generator. Permanent magnets were added in the created model and influence of these additional magnets is going to be analyzed. Tasks of the work are described in more details. in the introduction. The topic of synchronous generator and hybrid synchronous generator in general is described in the theoretical part. The next part of work deals with the design of salient pole generator. In the other part of the work calculation and design of the generator model are described in Ansys program. Furthermore there are some results from program compared with the results from company. Some model parts and other graphic outputs from Ansys program are shown. After that the creation of hybrid synchronous generator is described and created models of hybrid synchronous generators are compared and evaluated.
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Study of concentrated winding induction motor
Trn, Ondřej ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This diploma thesis deals with the possibility of using a concentrated winding in an induction motor and the use of copper bars in a rotor cage. The first part of the thesis explains the basic theoretical knowledge of the operation and principle of the induction machine. In this theoretical part we will learn what is actually a concentrated winding and how it is placed on the stator. The second part is focused on the analytical design of the machine with classical distributed winding and with concentrated winding. The third theoretical part is an introduction to the issue of influencing the motor harmonics. The last final part of the thesis shows differences in operational properties of designed machines.
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Microgenerator
Pospíšil, Kamil ; Němec, Jan (referee) ; Ondrůšek, Čestmír (advisor)
In this master’s thesis gives an overview of the finite element method (FEM) as used in electrotechnical practice. It deals with calculations of electric and magnetic fields. The task can be solved using ANSYS, FemLab, Femm, Quickfield and next software. Femm is the one I have chosen. The programs are described here, and their use is demostrated on examples. The outcome of the project is a calculation of magnetic field of a microgenerator in a stationary and dynamic field.
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Electrical Servo Drives for Critical Applications
Hubík, Vladimír ; Kurka, Otakar (referee) ; Ondrůšek, Čestmír (referee) ; Opluštil, Vladimír (referee) ; Singule, Vladislav (advisor)
The presented work deals with doctoral thesis named “Electrical drives for critical application”, which is solved in the Institute of Production Machines, Systems and Robotics. The paper tries to subsequently describe the progress during development of electric drive and to introduce the findings reached during project solving. The critical application requirements have been defined at the beginning, especially for the aerospace industry point of view. The work deals with the architecture of the control and power electronic, control software algorithms of the brush and brush-less BLDC motor with respect to the final certification aspects. It is also discussed the effectivness of the new development methods based on the modeling and simulation. The Model Based Design approach have been proved and verified during aircraft onboard equipment development. The findings of these are discussed at the end of this work.
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