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Garage door drive with idnuction machine
Lažek, Tomáš ; Cipín, Radoslav (referee) ; Pazdera, Ivo (advisor)
This thesis deals with a design of an electrical drive for a sliding side door. Goal of the thesis is to design of a frequency converter for an asynchronous motor with a gearbox. In the first part, the power supply for the freqency converter is solved in form of a single phase rectifier. Power section is solved by an integrated module IKC10H60GA manofactured by Infineon. The control board is provided with circuits for communication between the processor and the power section. Auxiliary power supply is designed as a fly - back converter. The drive of the converter is realized by STM32 Nucleo - 64 board. The design of the converter and drive algorithm are described in detail.
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Control circuits of railway lift
Kopecký, Jan ; Lažek, Tomáš (referee) ; Huták, Petr (advisor)
This master thesis deals with the mechanical and electrical design of the drive of the inclined construction lift. Individual components are selected in the design. Furthermore, a theoretical research is carried out regarding wireless modules and logic controllers. The selection of sensors is made and the method of retrieving signals from sensors and converting them into iputs the control circuits is also outlined. A program is written in Arduino IDE that wirelessly controls the motion of a motor via variable frequency drive.
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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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Simulation of induction machine control methods with respect to maximum efficiency
Hanzlíček, Martin ; Pazdera, Ivo (referee) ; Lažek, Tomáš (advisor)
The diploma thesis deals with the simulation of induction motor control with respect to high efficiency. The theory of an induction motor is described here, with emphasis on its losses. Scalar and vector control are also described here. Vector control is optimized for higher efficiency. Subsequently, the creation of a model in the program đť‘€đť´đť‘‡ đťżđť´đťµâ’𝑆𝑖𝑚𝑢𝑙𝑖𝑛𝑠is described here, for the comparison of scalar and vector control with optimization.
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Simulation of multilevel converters
Strieš, Jakub ; Huták, Petr (referee) ; Lažek, Tomáš (advisor)
This bachelor thesis deals with the search of multilevel voltage converters. The aim of the work is to acquaint the reader with the basic topologies in the first part and to simulate selected events on some of them in the second part. Topologies with clamping diodes, floating capacitors, cascaded H-bridges and modular MMC converters are presented. The simulations are performed for the last two mentioned topologies. The PWM methods used in this topic are also described. The results of individual simulations are presented in the final part in the form of graphs. Together, four events were simulated, namely direct connection to the network, start-up by ramp, failure of one phase and disconnection of the load. A block simulating an asynchronous motor was used as a load for the models.
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DC switching power supply
Látal, Jiří ; Folprecht, Martin (referee) ; Lažek, Tomáš (advisor)
Bachelor’s thesis discusses the design of an adjustable DC/DC converter with an output voltage of 30 V and a current of 10 A. The first part described three basic DC/DC converter topologies and the scheme of power and control structure of the converter. As a suitable topology of power supply was selected a two-switched forward converter. The integrated circuit SG3525ADWR2G was chosen as the PWM modulator for the converter. The second part of the thesis described the design and testing of the switch mode power supply.
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Simulations of Loss Minimization Control Based on Motor Parameters for Indirect Field-oriented Control of Induction Motor
Lažek, Tomáš
This paper discusses a simulation of a loss minimizationalgorithm for induction motor drive. This algorithm, whichis based on motor parameters, varies the flux linkage to obtainthe lowest possible losses. Verification of the algorithm’s functionalitywas performed by simulations in MATLAB/SIMULINKenvironment. First, an induction machine model was built withthe parameters of a real motor, taking into account magnetic saturation,Joule losses in both windings, iron losses, and mechanicallosses. Then, simulations with indirect field-oriented control wereperformed. The simulations showed that there is an increase inefficiency in the low torque region.
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Comparison of two loss minimization algorithms for induction motors
Lažek, Tomáš ; Pazdera, Ivo
This paper discusses two loss minimization algorithms for induction motor drives. Firstly, equivalence models in the form of Gamma and inverse Gamma are shown, from which the loss model is obtained. Then, the procedure for determining the two algorithms is presented. The results show that it is easier to determine the loss minimization algorithm for rotor flux. In terms of accuracy, both algorithms are similarly accurate.
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DC switching power supply
Látal, Jiří ; Folprecht, Martin (referee) ; Lažek, Tomáš (advisor)
Bachelor’s thesis discusses the design of an adjustable DC/DC converter with an output voltage of 30 V and a current of 10 A. The first part described three basic DC/DC converter topologies and the scheme of power and control structure of the converter. As a suitable topology of power supply was selected a two-switched forward converter. The integrated circuit SG3525ADWR2G was chosen as the PWM modulator for the converter. The second part of the thesis described the design and testing of the switch mode power supply.
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