National Repository of Grey Literature 14 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Closed loop system identification
Piskoř, Dominik ; Buchta, Luděk (referee) ; Pohl, Lukáš (advisor)
This thesis deals with testing of various modifications of the least-squares method, which reduces the bias in system parameter estimation. The first part of this thesis is focused on the theory and principles of every single method. The second part describes the implementation of identification methods in Matlab and Simulink. The third part is focused on the evaluation of used methods via statistical analysis. This part also contains an identification of electric parameters of the real PMSM motor model.
Compensation of Nonlinearities in AC Motor Control Algorithms
Buchta, Luděk ; Kuchař,, Martin (referee) ; Glasberger,, Tomáš (referee) ; Blaha, Petr (advisor)
Analysis of the dead-time effect and other nonlinearities of the voltage source inverter was carried out in the introduction of the doctoral thesis. Three compensation strategies for vector controlled PMSM were proposed based on the analysis. The voltage disturbance observer with cost function of current errors is based on the model of PMSM, known machine parameters and easily measurable quantities. The second observer which estimates the dq- axes currents and the value of the voltage error with one parameter only is designed based on the harmonic analysis and Kalman filter algorithm. The third method combines an adaptive approach with feedback and voltage disturbance observer that is based on the PMSM model. Furthermore, the two compensation methods for vector controlled induction motor were proposed. In the first case, the standard compensation strategy is extended by a harmonic compensator that suppresses the residual 6th harmonic component in dq- axes currents. The last strategy detects the polarity of the estimated phase currents that are obtained by the Kalman filter. All compensation strategies have been verified by MATLAB/Simulink simulations and by experiments on real drives.
BLDC drive control
Havlíček, Jiří ; Buchta, Luděk (referee) ; Otava, Lukáš (advisor)
The bachelor thesis is focused on problems of sensor control of Brushless DC Electric motor (BLDC) using hall-effect sensors. The BLDC motor is connected to 3-Phase low-voltage board which was produced by Freescale Semiconductor, Inc. The board is adapted to control electrical motors by MC56F8006 signal microcontroller. The next part is devoted to implementation of interconnection of the machine with the Matlab/Simulink programme using the MF 624 multifunction I/O card. Cascaded control, current and speed loops are used for the final configuration. The former loop is realized in the signal microcontroller, the latter one in the Simulink programme.
Model of photovoltaic power plant
Janic, Lukáš ; Buchta, Luděk (referee) ; Veselý, Libor (advisor)
Semestral thesis about modeling of photovoltaic power plant in Matlab. In the first part of the thesis deals with the processing history of solar energy, operating principle and construction of the photovoltaic cell and a voltage converters. The second part deals with the design of solar power plant in Matlab-Simulink. In the last section are shown simulated models and their simulated characteristics.
Parameter Identification of DC Motors
Kabelka, Ondřej ; Veselý, Libor (referee) ; Buchta, Luděk (advisor)
This bachelor´s thesis adress the issues of DC motor identification. It also adress the controlling of this motor and creation of current loop regulator and its implementation. Part of the thesis is also laboratory task, which deals with this topic.
Control of hot air tunnel
Šimurda, Jan ; Buchta, Luděk (referee) ; Blaha, Petr (advisor)
This bachelor thesis is dealing with the reconstruction of hot-air tunnel model for ma- nagement using CompactRIO system from National Instruments company. For a com- munication with the tunnel has been designed a user interface that guides a user through the system identification and controller design, which is testable as a simulation and then on a real device. The result of this thesis is to create a school task implementing the particular procedures.
Frequency method for motor parameters identification
Zimmert, Martin ; Buchta, Luděk (referee) ; Pohl, Lukáš (advisor)
This bachelor´s thesis deals with improved frequency method for motor parameters Identification. The goal of this thesis is to get an overview about identification method and simulate it on motor model in the Simulink and then to verify functionality of the method on the real motor. Firstly there are informations about a motor with permanent magnets and its control. Then there is an application of identification method for complete motor model. In the next part is measurement of the real motor. In the end is design of controller and discrete filter of identification signal.
Stepper motor feedback control
Mach, Martin ; Buchta, Luděk (referee) ; Blaha, Petr (advisor)
Goal of this thesis is to familiarize your-self with NCV70514 stepper motor driver by ON semiconductor, the function of bipolar stepper motor, hardware and software equipment developed for driving of NCV70514 and to explore possible algorithms for current and velocity adjustment to load by the means of back EMF. A simulink model was created for verification of said algorithms. The output is theoretical analysis and outputs of simulation. Futher more is to implement such algorithms in said microcontroler a then create graphic user interface running under Windows OS.
Spectral method for motor parameters identification
Sedláček, Filip ; Buchta, Luděk (referee) ; Pohl, Lukáš (advisor)
This project deals with the problem of spectral method for system identification. Introductory part acquaints reader with basic concept of identification and explains its application in practice. It describes and mathematically derives two non-parametric methods for identification – correlation method and spectral analysis. The main aim of this final project is testing and implementation of spectral analysis in system parameters identification, which is specifically described in remaining sections of this project. These sections discuss a fundamental rules, procedures and principles in order to prepare a reader as much as possible for its final application in REAL-TIME system identification.
The algoritm for estimation of the mechanical torgue on the dynamometer
Jávorka, Szabolcs ; Buchta, Luděk (referee) ; Veselý, Libor (advisor)
This paper deals with the modeling of asynchronous motor. Ccomparing the simulation date to reality. And attempts to find an algorithm for calculating the mechanical torque assist state estimation engine.

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