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CONTROL SYSTEM DEDUSTING ARC MELTING FURNACES
Blažek, Ondřej ; Klíma, Bohumil (referee) ; Huták, Petr (advisor)
This master´s thesis deals with control and process visualization system dedusting arc melting furnaces, the subject of this master´s thesis is electrical part of the ventilation system from the control system via industrial communication to the design of power components, which include the main fan motor powering inverter. Another part is paid to the design and description of the proceedings, a concept of the control program, design visualization, implementation, remote access and archiving of process values. The last part contains evaluation of the project in terms of the preparatory phase and in terms of commissioning, in particular the description of the additional work that had to be compared to the proposal for commissioning performed.
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Mathematical model of synchronous motor width permanent magnet
Fajkus, Petr ; Klíma, Bohumil (referee) ; Huták, Petr (advisor)
The work is focused on the design of synchronous motor control with field weakening possibility. At present synchronous motors used in many applications. Often is used synchronous motor with permanent magnets. This type of motor may have different transverse and axial inductance. In most cases it is desirable to design the engine using a computer model. Therefore the synchronous motor described mathematically in order to create the model of motor. At work is also crated model of synchronous motor control. The control is designed for the highest possible speed range. Therefore, the motor control is consist of two parts. Speed is controlled by voltage in the first part. In the second part speed is controlled by field weakening. Everything is created and simulated in a computer program MATLAB-SIMULINK.
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Novel Methods of Sensorless Control of Drives with PMSM Motor
Lepka, Jaroslav ; Klíma, Bohumil (referee) ; Lettl,, Jiří (referee) ; Václavek, Pavel (advisor)
Purpose of this dissertation is to explore control techniques of PMSM motors and the design of a complex solution of sensorless control across a wide range of speed and torque. The proposed solution supports industrial implementation of different types of end equipment which use a PMSM motor. The work covers a thorough analysis of position and speed estimation. The Control structure is based on field oriented control technique, processes estimated quantities, and optimizes motor conditions to achieve maximum efficiency, start-up torque, and speed. The work discusses how the solution complies with the latest IEC standards. Compliance with these standards requires adapting the sensorless control technique and field oriented control structure. The elimination of a rotor position sensor and a temperature sensor measuring winding temperature requires development of techniques in software for blocked rotor detection and overload detection. The proposed solutions, which have been granted US patents, are explained in this work and utilize the unique features of an NXP microcontroller optimized for motor control applications. The achieved results are demonstrated on real industrial applications.
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Field Programmable Gate Arrays Usage in Industrial Automation Systems
Nouman, Ziad ; Kadaník,, Petr (referee) ; Kobrle,, Pavel (referee) ; Klíma, Bohumil (advisor)
Tato disertační práce se zabývá využitím programovatelných hradlových polí (FPGA) v diagnostice měničů, využívajících spínaných IGBT tranzistorů. Je zaměřena na budiče těchto výkonových tranzistorů a jejich struktury. Přechodné jevy veličin, jako jsou IG, VGE, VCE během procesu přepínání (zapnutí, vypnutí), mohou poukazovat na degradaci IGBT. Pro měření a monitorování těchto veličin byla navržena nová architektura budiče IGBT. Rychlé měření a monitorování během přepínacího děje vyžaduje vysokou vzorkovací frekvenci. Proto jsou navrhovány paralelní vysokorychlostní AD převodníky (> 50 MSPS). Práce je zaměřena převážně na návrh zařízení s FPGA včetně hardware a software. Byla navržena nová deska plošných spojů s FPGA, která plní požadované funkce, jako je řízení IGBT pomocí vícenásobných paralelních koncových stupňů, monitorování a diagnostiku, a propojení s řídicí jednotkou měniče.
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The temperature measurement with semiconductor sensor
Dostálek, Martin ; Klíma, Bohumil (referee) ; Huták, Petr (advisor)
This bachelor work disserts on measurement of temperature using the electronic temperature sensors DS18B20, which are controlled by microcomputer type AVR. This sensors use for communication the 1-wire type data bus. The 1-wire data bus, designed by Dallas Semicondoctor, allows connect more devices to the control unit using two wires. This type of measuring elements offers simple handling for the user. The sensor transforms the measuring data directly to the digital data. The rate of the transmission is determined by number of bits in the resultant value and the sensor is programmable during attendance by the set mechanism (master). The sensor code is consistent with the value of measured temperature. That means it doesn’t require supplemental decoding. The resulting data are worked up and displayed on LCD continuously. First part of this work is focused on the theory of 1-wire element. Further, there is an explanation of the principle of the measuring sensor function and its controlling by the control unit. Next, there is a basic description of the AVR type microcomputers, more detailed description is aimed at the ATiny2313 controller, which is used in this work. The important part is dedicated to the implementation of the 1-wire protocol to the appropriate control unit.
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Converters for HVDC Energy Transmission
Martinec, Roman ; Klíma, Bohumil (referee) ; Červinka, Dalibor (advisor)
The aim of this thesis is to introduce the high-voltage direct current (HVDC) systems used in the world today. The work lists the basic principles of connection between individual HVDC stations, as well as the configuration of the HVDC transmission link. In addition, the work describes the topologies of converters currently in use and also their principal semi-conductor components. In the conclusion of the thesis, the HVDC technology is assessed, including its advantages and drawbacks.
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Digitaly controlled inverter for induction motor
Dráb, Dominik ; Klíma, Bohumil (referee) ; Knobloch, Jan (advisor)
This thesis deals with the design of control unit of frequency converter for asynchronous motor, that is part of the laboratory stand. The work contains basic description of asynchronous machine and explanation of operation and design of frequency converters. Furthermore, the work explains the most commonly used methods for control of electrical drives with asynchronous motor. The following chapter describes the design of control module with microprocessor from Freescale. The work also deals with the creation of software for microprocessor. Additionally, the graphical user interface was designed for controlling the stand using a computer. The final chapter of thesis describes measurement of the induction motor.
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DSP56800 microprocessor line usage for asynchronous motor control
Kukuczka, Adam ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
Tato diplomová práce pojednává o možnostech simulace a modelování elektrických pohonů na základě Bondových grafů. Je zde uvedena základní teorie k problematice. V práci jsou představeny modely stejnosměrného a synchronního stroje sestavené touto technikou. Dále je zde seznámení s Freeware knihovnou Bondových grafů BG V2.1 k programu MATLABSimulink. Za pomocí této knihovny byly sestaveny oba modely strojů. V poslední kapitole je uvedeno srovnání modelování na základě teorie Bondových grafů s modelováním v blokových diagramech.
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Testing stand of synchronous machines
Král, Michal ; Pospišilík, Jiří (referee) ; Klíma, Bohumil (advisor)
This diploma thesis deals with a part of synchronous generator testing stand project. Thesis is focused on drive part of testing stand, the appropriate drive is chosen according to type of the tests. The attention is mainly on drive control, specifically on the configuration of frequency converter and software programming of the converter control in NI LabVIEW. Software also contains drive simulation program. Testing stands are sequentially installed and commissioned.
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