National Repository of Grey Literature 32 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
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.
Power Inverter Online Diagnostics
Knobloch, Jan ; Chlebiš,, Petr (referee) ; Drábek,, Pavel (referee) ; Klíma, Bohumil (advisor)
This doctoral thesis focuses on the problems of IGBT failure prediction in pulse converters using measurable changes of selected parameters (so--called trending variables) being influenced of transistor degradation during aging. Firstly the state--of--the--art in this field is presented in the dizertation. The description of designed and constructed automated measurement stand follows, enabling monitoring and recording of switching processes during accelerated aging. Further the problems of high--bandwidth measurement of electrical quantities during IGBT switching are described. Especially the problems of current sensing are analyzed and the most suitable sensor is selected. The data recorded using the developed apparatus served to identify potential trending variables allowing the failure prediction. Here the dependence of trending variables on aging and on parasitic influences (current, temperature, voltage) had to be distinguished. Finally the evaluation of trending variables is performed. Their insignificant sensitivity on accelerated aging is shown which complicates their practical implementation for the purpose of failure prediction.
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.
Radio Controled Tracked Vehicle Model
Ctibor, Jiří ; Knobloch, Jan (referee) ; Klíma, Bohumil (advisor)
The aim of the bachelor thesis is the design and creation of manufacturing documentation DC drive for the tracked vehicle model with remote control, its design, programing and inspirit. To create a manufacturing documentation it’s needed to be familiar with the design program for printed circuit boards Altium Designer. Program of the microprocessor will be created in CodeWarrior development environment in the C language. To design circuits were used generally datasheets of components. The proposal consists of several functional peripheral units that provide various functions needed. For control the circuit is used a digital signal processor aimed at applications in the motor drives.
Design and Simulation of Single Phase Active Rectifier
Bareš, Jiří ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
This thesis deals with single-phase active rectifier, strategy of control and simulation of its model. In the beginning of this work a principle of rectifier is described along with transistor switching system, which has impact on shape of input current. Dimensioning of rectifier for assembling model and designing of control, including phase-locked loop and regulators follows. In the end assembled model and its simulation is described.
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.
Forestry cableway remote diagnostics
Říha, Pavel ; Pazdera, Ivo (referee) ; Klíma, Bohumil (advisor)
This bachelor's thesis focuses on description of electronics and controllers of forestry cableways Larix. The stress is laid on controlling system among others working with GSM modem securing the communication with remote monitoring centre. The analysis of the need of local as well as remote diagnostics leads to definition of requirements for communication channel that needs to be secured. Applying GSM net and communicate through standardised industrial modems connected through port RS232 is suggested as the most effective solution. The main part of the dissertation includes particularities and possibilities of communication through GPRS service. All-embracing communication channel including the server that transfers data packets among particular clients is designed and programmed. The final part summarizes achieved results and outputs of testing compiled solution including data throughput and response. Simultaneously based on acquired experience some procedures for final implementation in evolution and production of new types of cableways are recommended.
Batteries for independent traction
Hladiš, Vítězslav ; Klíma, Bohumil (referee) ; Procházka, Petr (advisor)
The aim of this work is a review of literature of all types of batteries designed for driving in an independent traction (transport). The various types of batteries with them and compare based on their parameters (weight, cost, energy density / kg) to select the appropriate type of battery to drive electric cars, wheelchairs, electric bikes and scooters. The thesis is not a practical product or supplement. This is only a theoretical analysis of the issue.
Switched power supplies microprocessor control
Žůrek, Tomáš ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
This thesis deals with processor-controlled switching power supply. The power supply is designed to supply notebook from the power system of car.
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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