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Modeling of sensorless BLDC motor control
Reindl, Jakub ; Červinka, Dalibor (referee) ; Pazdera, Ivo (advisor)
The thesis is focused on the creation of a literature search of basic control methods, creation of a model of a BLDC drive and simulation of selected algorithms of a commutatorless DC motor. At the beginning, the construction of the EC motor is briefly described, then its basic parts and principles of electronic commutation are described. The work mainly deals with methods of sensorless EC motor control. In the next part, the created BLDC drive model in Simulink is described, and in the last part, three selected BLDC motor control algorithms are simulated.
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Universal inverter for multi-phase low-voltage drives
Pitner, Tomáš ; Pazdera, Ivo (referee) ; Knobloch, Jan (advisor)
The diploma thesis deals with the design and construction of a six-phase low-voltage high-current inverter. Overall design and calculation of the power components of the inverter including its cooling is performed, along with the control circuitry including the inverter leg drivers, the driver and autonomous control of the brake chopper and the interface circuit between the external control circuit and the drivers. In relation to the power components design, research of current distribution between paralleled MOS-FETs and paralleled inverter legs is conducted, leading to the theory of symmetrizing current transformers, for which numerical simulations and verification measurements are done. The thesis also deals with design of a DC bus capacitor -- dependence of the ESR on frequency and temperature for an electrolytic capacitor is measured and the harmonic spectrum of the capacitor current for SVPWM is calculated by numerical simulation. Finally, the construction of the inverter and its testing and measurements are described.
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Induction motor control using software tool X2C
Bartash, Roman ; Huták, Petr (referee) ; Pazdera, Ivo (advisor)
This paper deals with two induction motor control algorithms, namely direct torque control and vector control. The paper describes the different types of controllers and their settings, with output characteristics. Thus it is possible to get an understanding of the performance of these systems and compare them. Modelling is also carried out using X2C library, which gives an opportunity to further test the systems on a real motor.
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Switching benchtop power supply 0-30 V, 0-5 A
Galia, Jan ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
This thesis deals with the design and construction of switching mode power supply for lab application. Convertor is based on the forward topology with adjustable output voltage regulation from 0 to 30V and with maximal output current 5A. Antoher features of this power supply is adjustable current limiting function which can be set from 0 to 5A. For closed loop control was chose analogue cascade regulation.The contol part consists of operation amplifire TL072 and SG3525 contorl circuit.
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Industrial Pump with Electromagnetic System
Pazdera, Ivo ; Richter, Aleš (referee) ; CSc, Jiří Lettl, (referee) ; Skalický, Jiří (advisor)
This work is focused on innovative construction of the industrial radial sealless pump and mainly on construction of the three phase DC/AC converter based on new semiconductor technology SiC. These new semiconductor devices allow move switching frequency up to 100 kHz. For such high switching frequency new non-conventional topology of the output filter was designed. This high frequency is currently unusual in three-phase application with output voltage 400V. High switching frequency reduces size of wound components of the output filter and its presence is accepted in terms of total weight and price of the whole system. Clear sinus waveform of the output converter voltage reduces torque ripple, EMC and extend the lifetime and reliability of mechanical parts and the whole pump drive. Three phase synchronous motor is directly placed into the pump body and is designed as slotless motor. In the inlet area is the classical bearing replaced by active magnetic bearing. It is used due to possibility to pump aggressive liquids or substances where high level of cleanness has to be guaranteed.
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Class D power amplifier 2x 2 kW with switching power supply
Tylich, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The content of this thesis is a complete design of an amplifier working in class D, including a theoretical analysis. The thesis describes the functions of individual amplifier function blocks. The appropriate Class D amplifier topology is selected for the application. The design of the amplifier must correspond to the required power of 2x 2 kW to 4. The necessary calculations are performed to ensure the correct function of the amplifier. For reliability, it is necessary to select suitable terminal transistors. The thesis is a theoretical analysis of power supplies. Subsequently, a source with a suitable topology is designed, which will be designed to power the amplifier in class D. All necessary parameters are calculated, especially the power parts. The thesis deals with the design and complete implementation of the entire amplifier, starting with the design of the PCB and their production, subsequent installation, and recovery. After ensuring the function of all parts of the amplifier, various measurements are performed.
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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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Induction machnine control techniques and models
Vidlák, Michal ; Knobloch, Jan (referee) ; Pazdera, Ivo (advisor)
This diploma thesis deals with the design of the asynchronous mathematical model, and creation its model in MATLAB Simulink. And by creating different types of asynchronous motor control. At the beginning of the work there are theoretical knowledge about transformation of quantities into coordinates, which are needed for creation of mathematical model and further for machine control. Furthermore, control logarithms are created from these transformed quantities, which can be used to control the torque or engine speed. It is a constant magnetic flux control, scalar control, vector control, and ultimately direct torque control. All derived control algorithms have been tested in MATLAB Simulink. Where were simulations of investigated quantities.
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Fast-charger for lead-acid batteries 12 V
Kopuletý, Ondřej ; Pazdera, Ivo (referee) ; Vorel, Pavel (advisor)
This Master thesis deals with modification of lead battery charger connection. In particular, changes are made to the control board. The theoretical part describes the principle of charging lead batteries and the description of the basic types of switching power supplies. Furthermore, the dimensioning of important components in the circuit together with the optimization of the switching frequency and the parameters of the high-frequency transformer are also presented. At the end of the thesis is the procedure of assembling the whole charger.
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Simulink transformer models based on equivalent circuits
Petrič, Peter ; Huták, Petr (referee) ; Pazdera, Ivo (advisor)
The aim of the bachelor‘s thesis is to project and then realize models of transformer in Matlab/Simulink program. These proposed procedures show the relation between original transformer and its spare connections. The first part of bachelor‘s thesis is oriented to theory of transformers which defines basic parametres and relations between them in transformer. Later in this part we try to describe cross-over from basic transformer model to the spare connection which is needed in realization of model in Simulink. The second part of bachelor‘;s thesis is oriented to theoretical description of vector transformation. It describes some basic relations of general transformation, currents transformation and voltage in certain connections. The third part of bachelor‘s thesis shows some practical realization of spare connection models of basic transformer in Simulink program. In this part we modeled some current transformer models and voltage for single-phase and three-phase system. As to compare we have created process of currents and voltages in transformer as well as power and load of each model.
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