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Measurement of selected physical quantities
Zajíček, Matouš ; Štěpánek, Vojtěch (referee) ; Pruša, Radomír (advisor)
In the introduction of this thesis a brief literary research of existing types and principles of function of selected sensors of temperature, atmospheric pressure, relative humidity, weight and island electric energy sources is performed. The next part is focused on realization of measuring system, meant for usage on beehive, using Arduino development platform. In the final parts of thesis, a control measurement, verifying function of the system, is performed and energy consumption is evaluated, along with designing a suitable power supply.
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Methodology of machine tool’s electric drive system modeling
Pruša, Radomír ; Černohorský,, Josef (referee) ; Kurfűrst, Jiří (referee) ; Huzlík, Rostislav (advisor)
The present dissertation is focused on the methodology of modelling of the machine tool drive. The initial chapters contain a review of the current state of knowledge in the field of drive modelling with a focus on the electromagnetic part, thermal field and drive control. The acquired overview and orientation in the subject matter has enabled the development of a systematic analysis on the topic of modelling the machine tool axis drive. The follow-up work was aimed at obtaining the appropriate quality of the output parameters, according to the subsequent use of the results. The reason for this approach is to ensure only a minimum of input parameters. At the same time, the individual parameters must be readily available or easily measurable. The actual methodology of the drive modelling method was also based on the described strategy. The basic building blocks were chosen to be the warming of the machine, the energy balance, the setting of the control structure and, last but not least, the positioning accuracy. The applied methodology was also verified at the end of the thesis under different operating conditions, which were adapted to multiple drive variations.
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Design of signal generator for acoustic actuator
Demura, Dominik ; Bražina, Jakub (referee) ; Pruša, Radomír (advisor)
The topic of this bachelor thesis is the design and execution of a signal generator with different signal shapes. The signals will be reproduced by of an acoustic actuator. The generator is able to generate an acoustic output signal with variable parameters such as frequency and phase shift. The whole system was implemented using the Arduino platform and programmed using the Wiring programming language. The AD9833 generator was used to generate the signals.
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Mathematical model of load workplace for rotating electrical machines
Rybnikář, Petr ; Štěpánek, Vojtěch (referee) ; Pruša, Radomír (advisor)
This work deals with the creation of a mathematical model of load workplace for rotating electrical machines. The first part provides a general description of servomotors and their mathematical equations. The second part describes the commissioning and connection of the PLC to the inverter and the subsequent creation of PLC programs. The last part describes the creation of the PMSM model with its control and then verified the validity of the model and the real machine.
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Axial magnetic bearing as a passive vibration damper
Polák, Robert ; Marada, Tomáš (referee) ; Pruša, Radomír (advisor)
The aim of the bachelor thesis is to design a mathematical model describing the damping effects of a prototype passive axial magnetic bearing. The prototype consists of three permanent axial magnets, the two outer ones are stators and are connected to the base, the middle magnet works as a rotor. Part of the work was a research on the topic of vibration dampers and their mathematical models. An experimental measurement of the dependence of the response of the axial deflection of the rotor on the axial load of the shaft was performed on a prototype bearing. The approach to creating a mathematical model was divided into two parts. First, the geometry of the bearing was simulated using the finite element method programme FEMM and the dependence of the force acting on the rotor magnet as a function of its deflection was determined. In the second part, the permanent magnets were replaced by conductive loops, for which the dependence of the magnitude of the power dissipation on their mutual deflection was compiled by the gradual derivation from the known equations. By connecting these two parts, an equation of motion was created for the middle loop or magnet. Using the Matlab and Simulink programs, this equation was simulated and then the results were compared with experimental measurements. Finally, the measurement and suitability of the mathematical model were evaluated.
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Design of magnetic bearing for pump
Pruša, Radomír ; Ondrůšek, Čestmír (referee) ; Huzlík, Rostislav (advisor)
The aim of this thesis is to design a magnetic bearing system for a pump. The use of magnetic bearings is based on the necessity of preventing the contact of the pumped fluid with a lubricant. The designed passive bearing consists of three axially polarized annular magnet using repulsive magnetic forces. The designed eight-pole radial bearing is formed by a laminated stator with salient poles and two-layer concentric winding. The rotor of the bearing is hollow because it also serves as a liquid supply of the impeller to centrifugal pump. The design of both bearings is based on the finite element method from the software ANSYS Maxwell. The results from simulating the axial bearing forces have been compared with the values obtained from experimental laboratory measurements. The component stress has been verified by implementing the function of stress analysis in Autodesk Inventor. The work includes research on the topic of constructing active and passive magnetic bearings.
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Drive for seal-less pump
Pruša, Radomír ; Kurfurst,, Ing Jiří (referee) ; Ondrůšek, Čestmír (advisor)
The aim of this thesis is to design a drive for seal-less centrifugal pump. Designed motor with axial magnetic flux is a double-sided structure with an internal coreless stator. The construction of the seal-less pump is based on a patent no. 17818, which was created at the Victor Kaplan Department of Fluid Engineering BUT. Potential use of this assembly is mainly in the food industry, possibly in the field of chemically aggressive liquids. The whole design is based on coordination between analytical equations and finite element method of the software ANSYS Maxwell. The temperature ratios inside the motor were investigated when cooling with air by the iterative solution of thermal circuit. The work includes research on the topic of constructing the axial machines and their applications in pumps. A comprehensive specification of the entire seal-less centrifugal pump is given in Chapter 4.
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Efficiency map of synchronous machine
Gargulák, Jiří ; Marada, Tomáš (referee) ; Pruša, Radomír (advisor)
Subject of this bachelor thesis is application of interpolation on efficiency maps of synchronous servo-engines. Nearest neighbor interpolation, inverse distance weighting and bilinear interpolation is used. Another part of this thesis is measuring on drive of one axis on machine tool, which is made out of frequency convertor, synchronous engine and a ball screw. Also another subject of this thesis is research of power losses in synchronous engine, frequency convertor and ball screw.
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Passive axial magnetic bearing
Dostál, Patrik ; Štěpánek, Vojtěch (referee) ; Pruša, Radomír (advisor)
The goal of the bachelor thesis is to measure the characteristics of a passive magnetic bearing. The practical part of the thesis consists of two segments – experimental measurement of properties of a passive axial magnetic bearing and a simulation of this bearing using the finite element method in the FEMM application. The simulation also dealt with the effects of temperature on the bearing. It was discovered that high temperatures considerably lower the axial stiffness of the magnetic bearing. Other effects on the stiffness of the bearing were taken into consideration, especially the dimensions of used magnets and the distance between them. The values that were determined by the experimental measurement and the FEMM simulation were mutually compared. The analysed bearing was built for use in a seal-less centrifugal pump. The values determined by the simulation and the measurement were applied to practical use in pumps. A part of the thesis was concerned with a research on passive magnetic bearings. The research dealt with the principle of the bearings, their structure and their application.
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