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Measurement of thermal field in electric machines
Dostálek, Martin ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
Diagnosis temperature is one of the most important disciplines. We meet it in everyday life, but it is very important for all sectors of industry. This is a measurement providing an immediate state of the measured object. Contact measurement of different temperature sensors and contactless measurement using thermal imagers. The important part is the measurement of temperature rise of induction motor. Part of the work deals with losses in the electric motor. These losses are converted into heat, which affects from various parts of the machine. Correct identification of the temperature field is important in helping to design the cooling system of the instrument. Virtually the data obtained are compared with theoretical data. We will capture part of the device and realize thermal simulations in a suitable simulation program. We propose modifying the cooling machine and the resulting data from the simulation compares.
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Measurement and analysis of single-phase transformer
Princ, Pavel ; Huzlík, Rostislav (referee) ; Vítek, Ondřej (advisor)
The aim of that diploma thesis is low power transformer simulation via its substitutitional circuitry.As Instrument for matematical description of model and simulation of various operating situations with different amplitude and types of load was used Labview software. The software was simultaneously used for real transformer measurement and to compare these results with calculated values. The created program is also applied for measuring excercise for students. In The thesis is described measured transformer in terms of final elements method in FEMM software and there is showed the procedure of its design.
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Single-Phase Induction Motor Calculation
Ševčík, Pavel ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
This master's thesis considers by single-phase asynchronous motor. The first part discuss about construction, principle of operation and basic parameters of this motor type. It also discussed the emergence of torque and torque characteristics of the different types of engines. The second part explains the basic ways of obtaining grip moment including outline the principles of functions particulars constructions types, which is produce in practice. In the third part is minutely analyse single-phase asynchronous motor with auxiliary phase and permanently conect capacitor, including method of assign size of a capacitor. Fourth part section provides the principles of the procedure for calculating basic parameters of the single asynchronous motor with auxiliary phase. At the last part is accomplished a calculation of single-phase asynchronous motor with permanently conect capacitor at auxiliary phase including comparation with already manufacturing motor.
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Automated measurement of transient phenomena of synchronous generators
Hvězda, Jindřich ; Huzlík, Rostislav (referee) ; Vítek, Ondřej (advisor)
My master´s thesis named “Automated measurement of transient phenomena of synchronous generators“ deals with transient phenomena appearing during a three-phase short-circuit on output clips of synchronous generators. Introduction of my master´s thesis named “Theory of transient phenomena of synchronous generators” deals with a theoretic description of transient phenomena appearing during a three-phase short-circuit on output clips of synchronous generators. This part treats the existence of direct and alternating components of short-circuit currents flowing in stator winding during a three-phase short circuit. Afterwards it treats reactances of stator windidng for the duration of a three-phase short-circuit on clips of synchronous generators. Theme of the following part of the master´s thesis is “Technical setting of measuring system for analysis of transient phenomena of synchronous generators”. This part deals with an analysis of technical setting that characterizes measuring sensors. These sensors scan measured electrical magnitudes that describe transient phenomena. Measuring hardware by a firm National Instruments is designed on the basis of technical setting. Following part of the master´s thesis named “Measuring hardware for measuring of transient phenomena of synchronous generators as a platform PXI/SCXI” deals with a description of technical characteristics of designed measuring hardware for measuring transient phenomena. Practical part of the master´s thesis named “Software TransientVIEW for analysis of transient phenomena of synchronous generators” describes in detail a software conception of user interface of software TransientVIEW that is developed in a developing interface LabVIEW 8.6 by the firm National Instruments. Afterwards it treats implemented user functions that allows exact and effective work with analysis of transient phenomena of synchronous generators.
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Induction motor modification for synchronous operation
Pochyla, Martin ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
This paper is focused on customization of induction machine type STM71-4L. The need of optimal mechanical design is presented, to achieve sufficient synchronizing reluctant torque, which will result in rotor synchronization with stator magnetic field. Final mechanical design is suggested after research, which considers influence of the essential rotor dimensions on resulting electromechanical torque. This is provided with usage of finite element method calculation. As a result of the thesis the combination of two basic machines – induction machine and synchronous motor is presented. The measurement on induction motor, and it´s modified versions is presented in following chapters. In the last chapter the results of optimization and measurement are discussed and compared.
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Measurement of automotive alternators using LabVIEW
Kufa, Daniel ; Aboelhassan, Mustafa Osman Elrayah (referee) ; Vítek, Ondřej (advisor)
This work presents development system LabVIEW and the possibility to create virtual measuring devices. Particular realization of virtual measuring device within the frame of this work is applied on measurement of basic characteristics of claw-pole alternator. The structure and the principle of function of this alternator is described in brief. Created virtual measurement device is described in detail. The entire block scheme, that is the source code for LaBVIEW development system, is attached only in electronic form. The printed version contains front panel of the device and almost all the structures of block scheme.
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Program for calculation of BLDC motor
Chloupek, Karel ; Janda, Marcel (referee) ; Vítek, Ondřej (advisor)
This thesis focuses on problematics of BLDC motors. Thesis consist of theoretical and practical part. In introduction is the reader acquaint with problematics, principals of development, advantages and disadvantades of BLDC motors. Then folows a description of different types, their realization and construction. Main part of this thesis deals with segment stator. For this type of magnetic circuit was developed computing software. This software will design and provide calculation of motor due to given parameters. In second step, the program generates source code for FEMM software, which provides a simulation. This is the most effective way, how can designer simply verify his calculations
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Increase the Rated Voltage of the Vehicle's Circuit - Study
Horák, Richard ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
The point of this work is evaluate the parameters of automotive electric system and according to these properties choose suitable norm of higher voltage, propose conception of system and with analyst calculation suggest basic granary parameters of higher voltage. This calculation is enclosed. In the work is mentioned a historical development of required escalation in system and therewith connected changes of specified levels of system tension. As an exemplification of escalation calculus hereof electrical equipment, installed onto motor powered vehicle, are mentioned in attachment schema's of four vehicles Škoda Auto a.s.
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Single-Phase Induction Motor Calculation
Schlesinger, Petr ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
This master’s thesis’s target is to introduce the basic findings about single-phase asynchronous motors, their derivation from three-phase motors and the basics of a computation process and a concept of a single-phase asynchronous squirrel cage motor. The inbeing of this concept and the computation is created by classical processes for three-phase motors with a low voltage, 50 Hz.
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