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Parameters identification of DC machine coupled model
Kraml, Aleš ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
This thesis deals with design and implementation of experiments leading to identification of parameters of a DC machine, creation of its model with coupled electrical, mechanical and thermal part. The first part describes various methods of modeling thermal resistance between body and ambient and the methods are compared. Furthermore, methods of identifying coefficient of damping and identification of moment of inertia are described. Second part of the thesis describes preparation and identification of resistance of the winding, inductance, heat capacities of rotor and housing and parameter c and measurement of damping coefficients. In the next part, the creation of a Simulink model of the DC machine is described. Furthermore, this thesis describes the algorithm for identification of parameters of an existing machine and the possibilities of using the model and identification in the development of a new machine. The next part assesses using the algorithm of identification and model as a basis for the creation of a virtual twin.
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Calculation of Optimum Magnetic Flux of Induction Motor to Minimize Losses with Consideration of Temperature Influences
Toman, Marek ; Peroutka,, Zdeněk (referee) ; Rafajdus,, Pavol (referee) ; Vorel, Pavel (advisor)
This thesis deals with a calculation of optimum stator flux linkage of an induction motor in order to minimize losses at an arbitrarily chosen operating point over a wide range of speed and torque. An accurate identification of the parameters of the equivalent circuit is carried out in this work. The parameters of the equivalent circuit are considered to be not constant but dependent on the selected quantities. A thermal model of the machine is also created in the thesis which makes it possible to find out correct values of the stator winding resistance and rotor cage resistance in all calculations. A coupled model of the induction motor is subsequently developed using the improved equivalent circuit and the thermal model. This is a very accurate model of the machine that takes into account the interaction of electromagnetic and thermal processes in the machine. The coupled model forms then the basis of an algorithm for finding the optimum values of flux linkage. The values of the calculated optimal flux linkages are experimentally verified and a very good agreement between the theoretical calculations and experimental measurements is achieved.
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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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Milling spindle thermal model
Chlapek, Ondřej ; Musil, Filip (referee) ; Hadraba, Petr (advisor)
The aim of this thesis is to create two thermal models (black box and grey box), which would allow to predict the development of the milling spindle temperature, based on measured operating data. The accuracy of both created models was determined by statistical methods, and the models were compared with each other.
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Modeling and Control of Electric and Thermal Flows in Fully Electric Vehicles
Glos, Jan ; Horák, Bohumil (referee) ; Janeček, Eduard (referee) ; Václavek, Pavel (advisor)
Systematické řízení tepelných a elektrických toků v plně elektrických automobilech se stává velmi důležitým, protože v těchto typech automobilů není k dispozici dostatek odpadního tepla pro vytápění kabiny. Aby v zimním období nedocházelo ke snížení dojezdu, je nutné použití technologií, které umožní snížení spotřeby energie nutné k vytápění kabiny (např. tepelné čerpadlo, zásobník tepla). Je také zapotřebí vytvořit řídicí algoritmy pro tato zařízení, aby byl zajištěn jejich optimální provoz. V letním období je nezbytné řídit tepelné toky v rámci elektromobilu tak, aby nedocházelo k nadměrnému vybíjení baterie kvůli chlazení kabiny a dalších částí. Tato práce řeší jak návrh řídicích algoritmů, tak i vývoj rozhodovacího algoritmu, který zajistí směřování tepelných toků.
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Induction Machine Electromagnetic And Thermal Design Platform
Rúra, Dávid
Induction motors are used for wide range industrial applications. Each technology has different requirements for driving mechanism. This paper deals with the complex solution for totally enclosed fan cooled (TEFC) three-phase squirrel cage motor. Analytical computation gives the fast preliminary solution with sufficient accuracy. Together with professional ANSYS simulation software represent a design platform for TEFC design.
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Modeling of the thermal effects on living tissue during electroporation process
Kafka, Roman ; Cipín, Radoslav (referee) ; Červinka, Dalibor (advisor)
The work deals with the current state of knowledge of heat transfer in living tissue. It is described here what the distribution of heat is affected with and the existing calculation options. For solving Pennes equation using finite element method COMSOL Multiphysics 5.4 is used. From the current state of the published studies, three are selected and described, each using a different approach. Based on the benefit of each of the studies described, a simple model of its own that simulates an ablation catheter attached to cardiac tissue is solved. A change in electrical conductivity as a function of the electric field intensity is taken into account, but there is also a comparison with anisotropic tissue that has electrical conductivity in different directions. The result of the calculation is voltage distribution, density of electric current and losses, temperature distribution in the model at several time points and graph of temperature development over time.
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Thermal Model Of Vehicle Cabin
For Hil Simulation
Chromiak, Michael
The Thermal model of the vehicle cabin was created using differential equations in the Matlab Simulink environment. By changing parameters, it is easy to set the model to any type of passenger vehicle. The accuracy of the model calculation has been successfully verified by real temperature measurement in the car. The model can therefore be used for HIL simulation to develop control system for air conditioning for cars. The output of the model is the average temperature of individual parts of the car as well as air temperature in the cabin.
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Thermal Model of Induction Machine and its Practical Verification
Toman, Marek
This article deals with making of thermal models of electric machines using so-called thermal network. The first part of this article describes reasons why thermal models of electric machine should be used. In the second part the heat transfer basics and thermal network basics are described. The last part is focused on simulation of a thermal network of a specific induction machine and its verification of correct functionality by measurements.
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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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