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Control of salient PM machine using d-q frame machine model and Matlab Simulink
Dušek, Jiří ; Huták, Petr (referee) ; Ondrůšek, Čestmír (advisor)
Tato práce se zabývá synchronním motorem s permanentními magnety na rotoru (PMSM), jeho modelováním a návrhu regulační struktury. V práci jsou uvedeny způsoby a výhody použití permanentních magnetů v elektrických motorech. Dále se práce zabývá transformací třífázové soustavy do dq0. Pomocí Parkovy transformace jsou v práci odvozeny rovnice stroje v dq0 souřadnicovém systému a vytvořeny náhradní schémata stroje v dq osách. Rovnice i schémata zahrnují jak ztráty v mědi, tak ztráty v železe. Náhradní schémata jsou popsány elektrickými a mechanickými rovnicemi a následně překresleny do grafické podoby v programu Matlab Simulink. Vytvořeny jsou dva modely PMSM, jeden s uvažováním ztrát v železe a druhý bez těchto ztrát. Pro oba dva modely je zde popsán postup návrhu regulátorů proudu a otáček. Pro model, u kterého jsou uvažovány ztráty v železe je navíc použito více druhů řídicích strategií a tyto strategie jsou mezi sebou navzájem porovnány.
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Classification of asynchronous motors
Čala, Václav ; Dušek, Jiří (referee) ; Singule, Vladislav (advisor)
This diploma thesis deals with a creation of a “Classification Document” of asynchronous motors with a short-circuit armature with axial heights of 355, 400, 450, 500, and 560 mm. Furthermore, it is concerned with a creation of an integral design documentation for the production and assembly of these motors at the company TES VSETÍN, s.r.o. By writing this diploma thesis I would like to achieve a simplification of communication with the customers during the processing of asynchronous motors orders and to speed up the processing of asynchronous motors orders not only in the design department but also the complete technologic preparation of the production which will surely be provided by this integrated documentation.
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Special induction machine as source of electric energy
Dušek, Jiří ; Janda, Marcel (referee) ; Skalka, Miroslav (advisor)
This work deals with description of an induction machine principles for both of motor and generator operations. Then is been described a special kind of an induction generator working into an isolated system. The construction of an induction generator was designed with two stator winding connection due to possibility of the variable number of pole pairs. Also there is an excitation capacity design for self-excitation. Last part of this work contains the measurement of an induction generator with different values of excitation capacity and both terminal clamps connection.
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Electronic throttle
Dušek, Jiří ; Beran, Martin (referee) ; Havlíková, Marie (advisor)
The aim of this master’s thesis was to analyze the contemporary electronic throttles and the requirements imposed on them. Then to build the mathematical model, identify parameters of the given electronic throttle, proceed the verification and on its basis to build the simulation model. There were selected suitable control and high power components to control the electronic throttle. Due to the knowledge of these parameters the simulation model was extended. For this extended simulation model was designed the position cascade controller with speed and current control loop. Using the designed controller the implementation of the electronic throttle control and the available high power and control module was realized.
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Measuring system for recording and displaying LF magnetic field
Dušek, Jiří ; Soukup, Ladislav (referee) ; Vyroubal, Petr (advisor)
Diploma thesis describes types and measuring principes of magnetic field as first. Furthermore it deals with parameters of sensor HMC2003 and data acquision. Selected card for acquision was USB-6218 from company National Instruments. After that project describes programing interface LabVIEW, which was used for desing of acquision program. Next part deals with comuncation between card and computer, drivers and properties of card. After that were explained requirements on measuring interface. Furthermore it deals with basic parts of the acquision software and describes its function with connection to user interface. Finally the interface was tested.
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Optimalizace procesu nasazení technologie WebRTC
DUŠEK, Jiří
The diploma thesis deals with the optimization of deployment and infrastructure of systems based on WebRTC technology for streaming video and audio over the internet network, in which this technology enables creating P2P connections between endpoints. The thesis describes problems related to P2P access and finds an alternative in the form of a specific SFU server. The provided client application implements P2P communication method, which is compared with SFU thanks to the implementation of its own measuring apparatus and implements automated switching of both modes in the background of the ongoing conference and proposes further optimization changes for a continuous conference in order to reduce endpoint load.
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Measuring system for recording and displaying LF magnetic field
Dušek, Jiří ; Soukup, Ladislav (referee) ; Vyroubal, Petr (advisor)
Diploma thesis describes types and measuring principes of magnetic field as first. Furthermore it deals with parameters of sensor HMC2003 and data acquision. Selected card for acquision was USB-6218 from company National Instruments. After that project describes programing interface LabVIEW, which was used for desing of acquision program. Next part deals with comuncation between card and computer, drivers and properties of card. After that were explained requirements on measuring interface. Furthermore it deals with basic parts of the acquision software and describes its function with connection to user interface. Finally the interface was tested.
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Changes of microclimate in a sedge-grass marsh within the last 40 years
Dušek, Jiří ; Stellner, Stanislav ; Hudecová, S.
The average, maximum and minimum air temperatures have been gradually increasing since 1977 to 2017. The air temperature rise was not the same in all periods of the year. We found different increases for individual months. The daily mean air temperature rose significantly in the growing period (April-August). The precipitation characteristics have been changing in the sedge-grass marsh too. The observed trends differ among months in sign as well as in the magnitude, and they are consistent with the air temperature changes. We found that extreme precipitation seems to occur significantly more frequently in recent years compared to the period before 2000. Awareness of these changes is important for possible positive human intervention when a desirable wetland ekosystem function is threatened.\n
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Magnetic field measurement
Dušek, Jiří ; Máca, Josef (referee) ; Vyroubal, Petr (advisor)
Bachelor thesis describes ways and technology for measuring of the magnetic field. Furthermore it deals with comparing sensors for magnetic fields measuring and creating a basic conception of the meter. For design of conception was selected sensor HMC2003 from Honeywell company. Design of conception describes two units, which meter contains. Conception include power, compensation and reset circuits. After that is detailed describe layout of both printed circuit boards, setting up and soldering components. Output of this meter is signal of the three axis of sensor. Meter was subjected to trial run, which verified functionality of the whole device.
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