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Frequency inverter for small induction machine
Pavlík, Ondřej ; Procházka, Petr (referee) ; Červinka, Dalibor (advisor)
The aim of this diploma thesis is to continue in prototype realization and a final proposition of three-phase frequency transformer pilot projected in scope of my bachelor work. This transformer is outlined for a small unsynchronized engine to 100 watt output and is designed to supply the fan motor. This suggestion was optimalized from the standpoint of bargain low price and technical feasibility. Powerful part of transformer is solved with help of circuit FSB50450 which is fed from compact source MYRRA 47155. Steering system is guaranteed with circuit MC3PHAC. This device is possible to use in less demanding applications where it was resisted by high expensive price of common frequency transformers.
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Drive of peristaltic pump for medicine
Smrž, Ondřej ; Procházka, Petr (referee) ; Huzlík, Rostislav (advisor)
This work is focused on the design of the peristaltic pump drive for medical purposes. Its initial goal is closer introduction of peristaltic pumps and stepper motors. Then the design of BLDC motor will be made and the use of this motor will be compared with stepper motor. Design of the BLDC motor will be made using RMxprt. Last but not least simulations of both types of motors for the peristaltic pump will be created in Simplorer. Finally, the program LabVIEW will be introduced and a program for controlling a stepper motor will be created.
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DC/DC converter
Němec, Martin ; Kuzdas, Jan (referee) ; Procházka, Petr (advisor)
This project deals with transistorized converters in particular a four-quadrant bridge. The main part of project discusses the drivers of transistors and a possible way of controlling a converter. The proposal of control electronics and the regulation structure are involved in the second part. This project also includes a construction of an apparatus which will be used as a teaching material.
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Control of dividing attachment
Španěl, Petr ; Procházka, Petr (referee) ; Huták, Petr (advisor)
Automatic cutting machine can cut wires and cables to user-defined length at a specified number of pieces. These equipments are usually custom-made for needs of the requested application and they are not very spread out tools on the Czech market. This described device is specified for efficiency-rise in the production of heat-resistant cables. These prepared cables are used for internal connection of the resistors.
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Utilization of MERS in heavy current engineering
Vetiška, Vojtěch ; Procházka, Petr (referee) ; Huzlík, Rostislav (advisor)
This graduation thesis is aimed in usage of MERS circuits in high-current electroengineering. The MERS circuit is a serial variable capacitor which capacity is possible to change by the help of switching of semiconductor components. On beginning of the thesis I shall acquaint you with usage of the MERS circuit. It will be sketched out their basic circuitry, the operating method, possibilities of transistors switching and calculation of the capacity capacitors for particular controlling method. On the prepared device we shall accomplish the predefined measurement. Furthermore we shall create the simulation by means of the Matlab programme. In the end we shall compare the results of the simulation with measured values.
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Resistance saw
Kalčík, Petr ; Minárik, Vladimír (referee) ; Procházka, Petr (advisor)
This work is focused on the design and construction of component parts of resistance saw. Mechanical parts consist of a movable bracket and a taut cutting wire of Constantan. Electrical parts are designed to supply and control temperature of the cutting wire. The current intensity in the cutting wire is compared with the required current intensity. The difference of these two measurements is fed into a PI - controller. The next part is a PWM generator which generates the square wave signal. The pulse ratio of this signal is proportional to the required temperature of the cutting wire. This signal switches a switching converter that consists of a power transistor P-MOSFET IRF5210 and a diode MBR20100CT. Choking coil with a ferrite E core and with the cutting wire is connected to the output of the converter.
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Auxiliary power sources in electric traction
Kuzdas, Jan ; Procházka, Petr (referee) ; Červinka, Dalibor (advisor)
The purpose of this thesis is proposal of auxiliary power sources in electric traction. Specifically we deal with two converters. Both of them were used in traction vehicle's applications, which are developed by the Department of Power Electrical and Electronic Engineering, Brno University of Technology. First converter was used as a power supply in secondary traction mechanism of electric locomotive. Second one to power supply of dash board in automobile with fuel cells.
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Electric drive of lift model with EC motor
Kutrucz, Tomáš ; Procházka, Petr (referee) ; Koláčný, Josef (advisor)
This diploma thesis describes a simulator of home elevator driven by an EC engine (external combustion engine). The introductory chapter of the thesis deals with the history of elevators. It also contains the description of EC engines, the description of the construction of the simulator and of the mechanical, electrical, and software adjustments carried out as based on the thesis. The main part of the work concentrates on the description of the changes of the drive algorithms, the production of the 3D simulator and the animation in the background of 3D Solid Works. Moreover, it also deals with the experimental performance measurement based on the loading of the stimulator drive.
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Study of thin films refractive index by interference microscopy
Procházka, Petr ; Veselý, Michal (referee) ; Zmeškal, Oldřich (advisor)
This bachelor thesis is focused to measure of spectral dependences of refractive index in thin layers. The object of this thesis was measurement of dispersion dependences of refractive index. The theoretical part deals with present methods of refractive index measurements and quantities associated with. These methods were ordered from the easiest to the most complex methods. Intention of own work was reached results by the very easy method of interference mi-croscopy. Thin layers of various organic matters were investigated by optical microscope and main-ly by interference microscope to determine their optical attributes – refractive index and his dis-persion dependences. There were images, which were made by interference microscope and digital camera. These images were subjected to image analysis by computer program HarFA. Dispersion dependences of refractive index were proved by elaboration by this computer pro-gram.
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