National Repository of Grey Literature 41 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Experimental stand for properties verify of heat pipe in the electric machine shaft
Kučera, Jaroslav ; Cipín, Radoslav (referee) ; Vlach, Radek (advisor)
My bachelor thesis follows my semestral work, which was devoted to the design of the measuring station simulating the cooling of the rotor of the electric machine using a thermal tube in the shaft, and extends it to a practical test, where the measurement verifies the correctness of my design and the proper functioning of all its parts. During the measurement, the software was modified to provide more accurate temperature control in the heated chamber. The basic assumptions have been confirmed. As has been demonstrated during the experiments, greater attention should be paid to the material for the formation of chambers.
Matlab Models of DC/DC Converters
Macík, Tomáš ; Cipín, Radoslav (referee) ; Pazdera, Ivo (advisor)
The Bachelor’s thesis is focused on modeling of DC/DC converters without a transformer using Matlab Simulink software. The first part is dedicated to general explanation of function of selected switch mode power supplies. The second part contains the deduction of equations for every selected switch mode power supply and design of circuit components based on required converter parameters. The models of converters have been created in Matlab Simulink using deduced equations. The models of STEP UP and STEP DOWN converters have been created also using Simscape Power Systems Toolbox and the control of current and voltage has been designed for them.
Thermal calculation of induction motor using thermal networks
Čáp, Martin ; Cipín, Radoslav (referee) ; Toman, Marek (advisor)
This thesis deals with thermal calculation of asynchronous motor. The theoretical part deals with principles of heat transfer, which are important for thermal calculation. Another theoretical part describes asynchronous motor analysis and its loss. In the practical part, these losses together with the electromagnetic circuit are calculated. Subsequently, two thermal networks are created to calculate the warming of individual machine parts. To ensure the correctness of the result, a bound model of partial calculations of the asynchronous machine is created. The next step is to compare the calculated electrical quantities and the calculated temperatures with respect to the measured values.
Analysis of core loss of a small induction machine
Plíšek, Oldřich ; Cipín, Radoslav (referee) ; Mach, Martin (advisor)
The aim of this master´s thesis is to analyze core losses of a small induction motor. Analyzed values are obtained from laboratory measurements, software analysis and 2D finite element method simulation. The theoretical part of this thesis consists of two parts. The analysis of the higher spatial harmonics presents in the induction motor and the analysis of core losses of the motor. Practical part consists of laboratory measurements according to ČSN. Measured values are used to calculate individual losses. The next part consists of creating a model for software analysis (Maxwell RMxprt). The generated model is converted into a 2D simulation environment (Maxwell 2D), where it is adapted to obtain values from the examined parts (rotor and stator teeth and rotor cage). Results of simulations at different loads are compared and analyzed from the point of view of higher harmonics.
Indirect torque measurement in the output of load drive
Jelének, Marek ; Cipín, Radoslav (referee) ; Ondrůšek, Čestmír (advisor)
For loading of excavator drive units, it is necessary to use electromechanical loads with a high torque up to 16,000 Nm in a low speed range from 0 to 150 min-1 with a maximum output of 50 kW. The electromechanical load consists of an asynchronous dynamometer assembly with a tilting torque measurement system in conjunction with a front three-speed gearbox. The dynamometer is powered by a converter with vector control. To determine the torque at the gearbox output, a correction must be made and the influence of operating temperature and operating speed must be taken into account. Experimental measurement of these influences and dependencies makes it possible to create a mathematical model that can be implemented in the power converter for torque control at the output of the gearbox. The aim of the master thesis is a brief design of the loading drive, design an implementation of experimental measurement of efficiency maps and evaluation of the influence of inefficiency of gearbox efficiency.
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.
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.
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.
Calculation of parameters of small induction motor
Vojče, Zbyněk ; Cipín, Radoslav (referee) ; Vítek, Ondřej (advisor)
This bachelor thesis deals in the first part with a construction and a principle of function of an induction motor. In the second part deals with an actual analytical calculation of three-phase low power induction motor. Is performed a simulation in a program Ansoft RMxprt, which calculated the characreristics of the motor analytically and simulation in program Maxwell 2D by finite element method. The aim of the work is to compare results of simulations with results of analytical calculation.
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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