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Motor speed control exhibit with frequency changer
Möhwald, Jiří ; Marada, Tomáš (referee) ; Němec, Zdeněk (advisor)
The following diploma thesis deals with the management of asynchronous motor revolutions by a frequency converter MICROMASTER 440 via the programmable controller S7-200. At the beginning, I researched the company documentation of Siemens, which is the producer of the frequency converter and the programmable controller mentioned above. As my work proceeded, I also started to study the company documentation of Mitsubishi Electric, which produces the operating pannel. The first part of my thesis provides a general description of the stated devices and the second part deals with the solution of the task itself. My task was to design a way of communication between the converter and the controller. I chose a USS protocol via serial port RS-485. The operation of the controller was performed by using an operating terminal type GOT1000 which was connected to the controller. In summary, my diploma thesis primarily deals with the construction of an operating programme for the controller and with creating of a graphical control on the terminal. In the end, I evaluated the knowledge gained during the work on this subject and suggested further procedures.
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Use of standard centrifugal pump as turbine
Podešva, Adam ; Franc, Zdeněk (referee) ; Habán, Vladimír (advisor)
This work deals with the use of a centrifugal pump in turbine mode and control of the system where this machine is operated. The introduction describes and divides the various types of pumps and discusses the issue of Euler's pump and turbine equations. The flow control options are also described here. Part of the work is a research that examines the advantages and disadvantages of using a centrifugal pump in turbine mode, the possibilities of using this system and real applications in the Czech Republic and in the world. The main part is the design of a mathematical model in Microsoft Excel, which solves the regulation of the piping system with a pump operating in turbine mode, especially out of the optimal operating parameters.
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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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The bridge crane's travel mechanism
Žid, Miroslav ; Nezbeda, Jiří (referee) ; Škopán, Miroslav (advisor)
The aim of this master thesis is to design replacing the central drive of the overhead crane with dislocated drives. It´s a tong crane with the lifting capacity of 63 tons, located inside the hall. In the thesis is processed functional calculation of two types of drives, the associated types of brakes and the coupling element. Next there is a strength control of a new mechanism seat and a selected components. This whole leads to the output, which is the drawing documentation.
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Microprocessor controlled inverter for motors
Fiala, Michal ; Červinka, Dalibor (referee) ; Knobloch, Jan (advisor)
This diploma thesis deals with design of universal converter used for motor control by microcontroller. The first part contains concept, functional overview of the device and its parts. The next part deals with mechanical design and construction of the converter and dimensioning of power, control and measurement circuits. The following part describes control algoritm used for three-phase motor and its testing using simulation. The final chapter of the thesis describes PCB mounting and testing of the device and control algoritm on real motor.
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The influence of the frequency converter on the life and damage of bearings
Sukovatý, Adam ; Krejčí, Petr (referee) ; Nahodil, Petr (advisor)
This thesis deals with the effect of frequency inverter on the lifetime of roller bearings. The measurement has been carried out on the frequency inverter and induction motor by Siemens in the Switchgear laboratory of Fakulty of elektrical engineering and communication. Data has been recorded and processed on Adash VA4 Pro analyzer. Methods of measuring RMS values and frequency analysis of vibration and current were used for the analysis. Based on the mutual similarity of frequency spectrum, the presence of the high frequency capacitive current in the bearings has been proven. To prevent this, possible solutions have been presented. In the second part of the experiment an effect of changing pulse width modulation (PWM) on vibration was examined. The goal was to make a basic analysis and to provide background material for further research.
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Control of dry wall tape (DWT) rewinder
Bis, Jan ; Jirgl, Miroslav (referee) ; Pásek, Jan (advisor)
This thesis deals with a description of the industrial machine of the DWT (drywall tape) rewinder. The winder rewinds and cuts the drywall tape tape into smaller tapes, that are then sold. The first part contains a description of the winder, its structure and functions of its individual parts. The second part contains a description of the control system and the power wiring of winder. The next section contains a description of programming and setting of PLC, frequency inverters, and touch panel. Some modifications are then described when putting the winder into operation. The winder has been successfully implemented and built into a continuous shift operation. However, the development of the rewinder continues to improve its features and user-friendliness.
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