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Batteries for independent traction
Hladiš, Vítězslav ; Klíma, Bohumil (referee) ; Procházka, Petr (advisor)
The aim of this work is a review of literature of all types of batteries designed for driving in an independent traction (transport). The various types of batteries with them and compare based on their parameters (weight, cost, energy density / kg) to select the appropriate type of battery to drive electric cars, wheelchairs, electric bikes and scooters. The thesis is not a practical product or supplement. This is only a theoretical analysis of the issue.
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Compact inverter for BLDC motor
Nevřivý, Tomáš ; Červinka, Dalibor (referee) ; Procházka, Petr (advisor)
The work describes the design and implementation of compact inverter for brushless DC motor, which have mechanical power 600 W and rated torque 1.6 Nm. Motor is designed for DC link voltage with value 300 V. The focus is placed on the cost and simplicity. On this basis, the inverter is designed for uses single purpose power and control circuit. The power part is solved using a circuit FSBB15CH60C. The circuit is placed on a separate board of power electronics. Cooling of the power circuit is performed by the surface structure of BLDC motor. Control of the inverter ensures circuits LB11696V and NE566. The both circuits are placed on separate board of control electronics. Circuit LB11696V contains a control algorithm, as well as protections, which are necessary for safe operation of the inverter. Power supply of electronics is performed using step-down converter from MYRRA company.
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DC/AC one-phase inverter 230 V / 50 Hz / 60 VA for a back-up supply source with a galvanic separation
Šoupal, Ondřej ; Procházka, Petr (referee) ; Vorel, Pavel (advisor)
The aim of this thesis is to design power circuits and control circuits of single phase DC/AC inverter and its practical realization. This work describes basic principle of single phase inverter. Next step is a solution of output LC filter, input capacitor and semiconductor devices. It contains block diagram of control circuits and it focuses on design of oscillator for pulse width modulation and current limiting. The thesis gives details about practical realisation and testing measurements. Technical documentation was prepared for this inverter.
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Using generalized functions in continuum mechanics
Procházka, Petr ; Netuka, Horymír (referee) ; Pochylý, František (advisor)
Tato práce se zabývá využitím distribucí neboli zobecněných funkcí k řešení nestacionárních okrajových problémů v mechanice kontinua. Nejprve je zavedena teorie distribucí a jejich definice jako spojitých lineárních funkcionálů na prostoru testovacích funkcí. Druhá část teoretické kapitoly představuje Laplaceovu integrální transformaci. Následující kapitola se věnuje řešení průhybu nosníků pod vlivem nespojitého časově proměnlivého zatížení. Jejím výsledkem je vytvoření obecného modelu řešení průhybových čar nosníků vužitím distribucí. Poslední kapitola se zabývá řešením nestacionárního proudění v trubicích spojených hydraulickými prvky.
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Dynamic Programming in Biosignal Processing
Procházka, Petr ; Kolářová, Jana (referee) ; Klimek, Martin (advisor)
Bachelor thesis describes the dynamic time warping method (DTW), which is used for extrasystoles detection in ECG signales. Several methods for extracting a reference cycle are described in this paper. These methods are applied either to whole heart cycles or just to QRS complexes. Afterwards these methods are compared with results of cluster analysis.
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Electric drive of the wheelbarrow
Lažek, Tomáš ; Procházka, Petr (referee) ; Pazdera, Ivo (advisor)
This bachelor’s thesis deals with proposal of an electrical low-cost drive for the wheelbarrow. The first part of thesis is devoted to overview of operational characteristics of available electric motors, batteries and gears suitable for the construction of an electric drive. In the next part the thesis deals with the design and implementation of a pulse converter for a specific DC motor. The converter will be controlled by the integrated circuit UC3638.
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Three-phase inverter for induction motor in pump application
Šandera, Tomáš ; Huzlík, Rostislav (referee) ; Procházka, Petr (advisor)
The aim of this bachelor’s thesis is to propose a three-phase inverter for pumps with three-phase asynchronous motor with an output of 1 kW. The proposal was focused on quality and to resist any overloading during testing. Power part of the inverter module represents IRAMY20UP60B. Inverter control is separate and is implemented using NI sbRIO 9606. Until this facility was recorded control program created in LabVIEW FPGA.
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3f. inverter with drive control for drill press
Grom, Martin ; Vašíček, Adam (referee) ; Procházka, Petr (advisor)
Bachelor thesis deals with the design and implementation of a three-phase converter designed for driving an electric drill with asynchronous motor. Converter is designed using a specialized integrated control circuit and transistor power module. The thesis also contains description of the induction motor control, description of the inverter internal operation, functions of integrated circuits, overall design description and design of the printed circuit board. The proposed device has been built and tested. The test measurements were done on a working sample of the converter.
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Circularly polarized SIW cavity-backed microstrip patch antenna
Procházka, Petr ; Láčík, Jaroslav (referee) ; Mikulášek, Tomáš (advisor)
This bachelor thesis deals with a circularly-polarized substrate-integrated-waveguide cavity-backed microstrip patch antenna. The first part dedicates basic theoretical knowledge of microstrip patch antennas such as patch shape, the possibility of its excitation etc. The following part describes the possibilities and adjustments of generating circularly-polarized wave from a microstrip patch antenna for generating circularly-polarized waves and general knowledge about the advantages and application of circularly-polarized wave. The next part deals with a step-by-step design of a proposed antenna. The last part present a comparison of simulated and measured results.
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Control unit for BLDC motor
Krejčí, Ondřej ; Cipín, Radoslav (referee) ; Procházka, Petr (advisor)
This master„s thesis elaborates with EC motors problematic. There are described essential features of brushless DC motors, their principles, construction and methods for rotor position detection. There are mentioned commonly used control algorithms of EC motors including theory of three-phase convertors. This thesis also contains a complex design of the universal convertor for EC motor and its practical implementation. Power parts losses calculation, heat-sink calculation and measurements at the convertor prototype are also described in this thesis.
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