National Repository of Grey Literature 10 records found  Search took 0.01 seconds. 
Current distribution and heat losses in the low voltage circuit breakers
Musil, Pavel ; Janda, Marcel (referee) ; Makki, Zbyněk (advisor)
The work is focused on the calculation of decomposing the current and the thermal loss in circuit breakers of low voltage. In the work´s first half, there is a summary of the most frequently used circuit breaker elements with a focus on their constructional layout. The biggest attention is devoted to the circuit breaker marked LPN-16B by the company OEZ. A model of the under current trajectory of this specific element is created in a program Inventor on which the following calculation of decomposing the current and thermal loss was accomplished in a program Ansys. The obtained results are assessed in the conclusion of this work.
Analysis of thermal field in electrical machines
Korta, Tomáš ; Makki, Zbyněk (referee) ; Deeb, Ramia (advisor)
The main objective of this work is familiarization with the design and functions of asynchronous motor and computing of the thermal analysis of this motor using program ANSYS Workbench. A 3D model of asynchronous motor is created using Autodesk Inventor program, then the thermal transient analysis of the motor is computed according to the finite element method. The motor temperature is measured using both contact and contactless methods in the case of no load of motor operation. A comparison of computed and measured results is performed. Finally different cooling methods of electrical machines are presented.
Temperature analysis of molded case circuit breaker's current path
Mejzlík, Tomáš ; Makki, Zbyněk (referee) ; Dostál, Lukáš (advisor)
The work deals with the preparation of dimensional drawings, circuit-breakers and switching elements for inclusion in the database devices. Part of the original drawing documentation is from the U.S. catalogue EATON. Preparation of drawings from the catalogue meant to convert the projection between U.S. and European, including compliance with ISO and ČSN, redraw geometry to the CAD system using Autodesk AutoCAD 2010 and complete dimension. Another part of the project was to model the two completely dimensioned breakers in 3D space, along with their implementation in the model EATON cabinet, including the construction of their connections to buses and cable entry.
Calculations of temperature fields on the model of induction motor
Koníček, Pavel ; Makki, Zbyněk (referee) ; Janda, Marcel (advisor)
The aim of this work is to get acquainted with the construction of induction motor, the calculation of temperature fields in the motor model in ANSYS Workbench and subsequent evaluation of the results for different operating conditions. There is provided a general description of the function and design of induction motor, a summary of sources of heat inside the engine design, heat transfer theory, the basic description of the finite element method and ANSYS Workbench description. Furthermore, comparison of temperatures measured on a real engine with the values obtained from the calculation program.
Optimization of Cooling Synchronous Machine
Makki, Zbyněk ; Rafajdus,, Pavol (referee) ; Kačor,, Pavol (referee) ; Janda, Marcel (advisor)
The main goal of doctoral thesis is optimization cooling of the synchronous machine. Problem is solved based on the finite element method with use of ANSYS software. Work is built up from theoretical part where is comparison of base equations for heat transfer and simulations for several models. Next part shows us two methods how simulate free and force convection. Depends on the better method from the previous two methods is used for next calculations with several algorithm which are used for find of best parameters for synchronous machine. Our control parameter is mass flow rate.
3D CAD systems used in the field of electrical apparatuses
Makki, Zbyněk ; Krejčí, Jan (referee) ; Valenta, Jiří (advisor)
The aim of this project is to describe and compare individual 3D CAD systems and data format used in the area of construction and technical support in agreement with factual needs of project submitter company OEZ, Ltd. Fulfilment of 3D CAD systems background research which are used in the area of design of the electrical switchboards LV. Description of the main possibilities, that the particular system offers. Supported data format for export and import are mentioned too.
Thermal analysis of induction machines using Ansys Workbench
Kučera, Petr ; Makki, Zbyněk (referee) ; Janda, Marcel (advisor)
The aim of the master thesis is introduction with software Ansys Workbench and calculate the thermal field arroud the induction machine. After introduction with the software was bulit model of induction machine and there were simulated various thermal calculations at operating conditions. They were measured on a real induction machine in laboratories.
Solution magnetic field distribution in DC machine
Hájek, Jan ; Makki, Zbyněk (referee) ; Janda, Marcel (advisor)
This thesis deals with distribution of magnetic fields in the DC machine. Part of this thesis is the introduction of DC machines, principles of operation and distribution of DC machines. There is also discussed electrically commutated motors. The thesis demonstrates the types of permanent magnets and their properties. Then there is an analysis of the magnetic field electrically commutated motor Atas Nachod in the Ansoft Maxwell. Using Ansoft Simplorer, switching is carried out of the engine. Another part of this work is the analysisthe magnetic field electrically commutated motor Atas Nachod for three types of slot of the stator of the engine. Here it is seen what impact the change has slot on the distribution of magnetic field in the EC motor. Finally, training is carried out measurements of electrically commutated motor BOYANG BY92BL48-4000-2200.
Temperature measurement in electrical machine using Labview
Strmeň, Milan ; Makki, Zbyněk (referee) ; Janda, Marcel (advisor)
This work deals with using of virtual instrumental program LabView as a tool for thermal measuring at the surface of asynchronous engine. Its part is managing of problems of measuring by the aid of thermocouple, mainly conversion of thermoelectric voltage on temperature. The product of work is program which measures and displays required form and records values of temperature from four parallel branches of thermocouples.
FEM analysis of overcurrent trip unit
Makki, Zbyněk ; Augusta, Zbyněk (referee) ; Valenta, Jiří (advisor)
The aim of the project was to prepare the given model of the current path in the environment of the SolidWorks programme, in order to simulate the flow path in the environment of the Ansys programme, where there was calculated the distribution of current density,voltage drops and heat loss on the the specified current track according to specified conditions. The obtained results are analyzed at the conclusion of this work.

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