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Improvement Power Parameter of Small Induction Motors
Halfar, Tomáš ; Ondrůšek, Čestmír (referee) ; Hájek, Vítězslav (advisor)
The master’s thesis Improvement power parameter of small induction motors deals with issues of lowering the losses of small induction motors. The first part introduces with design and principles of operation of induction motors. Also introduces to theoretical problematic of losses, their lowering and measuring. In the practical part there are results of the measuring the losses in the induction motor ATAS Elektromotory Náchod a.s. T22VT512 (71-0512). There are proposed methods of increasing the efficiency of induction motor due to measuring and their verification in the Maxwell software. The last part is dedicated to measuring the losses of prototype motor from ATAS and comparison of results with previous motor.
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Optimalization Power Parameter of Small Induction Motors
Chincocolo, Joao Pepino Ndembe ; Grmela, Petr (referee) ; Hájek, Vítězslav (advisor)
Tato bakalářská práce “Optimalizace energetických parametrů asynchronních strojů malého výkonu“ popisuje testovací metody, potřebné ke stanovení ztrát a účinnosti elektrických strojů, se zaměřením na asynchronní stroje. Určuje výpočetní postupy pro vyhodnocení daných měření. Definice uvedených zkoušek jsou sepsány se zřetelem na současné normy. Z informací obsažených v částech s výše uvedeným obsahem vychází prakticky zpracovaný nástroj pro samočinné vyhotovení protokolu z měření. Jedná se o formulář v elektronické podobě. Vstupem formuláře jsou zadané naměřené hodnoty. Výstupem formuláře je protokol o měření, uvádějící výsledky výpočtů a grafy charakteristik. Pro účely této bakalářské práce byl formulář předvyplněn naměřenými hodnotami ze zkoušek konkrétního asynchronního stroje. Související výpočty k určení parametrů stroje jsou uvedeny.
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Parameters identification of the asynchronous machine substituting circuit
Běloušek, Radim ; Cipín, Radoslav (referee) ; Patočka, Miroslav (advisor)
Mathematical model and substituting circuit both include several parameters, which is important to determine for a control. This work is target on identification of parameters of substitute circuit of the asynchronous machine in -network form. The work is divided into several main units. In the first of them are shown the methods of identification of asynchronous machine on the selected machine. The measuring of torque characteristic by classical way with dynamometer and by dynamically with fly-wheels is shown in the next part of this work. The final part of this work is devoted to interpretation and comparison of achieved results.
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Voltage transformer
Kovařík, Martin ; Huzlík, Rostislav (referee) ; Ondrůšek, Čestmír (advisor)
This bachelor´s thesis focuses on the elements of equivalent circuit parameters of voltage instrument transformer TJC 7-G from the portfolio of ABB. Main focus is placed on correct identification of the leakage reactance of primary and secondary winding, which are used for correct settlement of protections. The measurement is done by using methods of measurement of transformer without load and with short circuited secondary terminal. The values are measured for different frequency levels, in order to determine precisely all the parameters. The theoretical part describes the use of instrument transformers, theoretical creation of equivalent circuit and parameters which affects the accuracy class. The conclusion contains the evaluation of different methods for determining the elements of the equivalent circuit and with its final assembly.
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Improving energy parameters of single-phase induction motors
Dospěl, Leoš ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
Bachelor thesis Improving energy parameters of single-phase induction motors deals with issues of lowering the losses of a small single-phase induction motor J22VV506 from ATAS Elektromotory Náchod a.s.. The first part deals with the theory of asynchronous motors and the issue of losses and their reduction is described in this part as well. In the second part engine parameters are measured and calculated efficiency of the machine and suggested ways to reduce losses. In the last part is measuring motor with the proposed regulation.
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Analysis of possibilities to improvement induction motors efficiency
Novotný, Jiří ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
In the first part of the master’s thesis dealing with the increasing efficiency of induction motors there are briefly presented basic information about induction motors, followed by an overview of the losses of induction motors. The next part deals with the ways to increase efficiency of induction motors without increasing tooling costs. The practical part consists of four measurements of four induction motors, with their various mechanical adjustments to make comparing benefits of these modifications possible. The measured results are compared by a finite element method in Maxwell 2D Design program, in which the same motors are simulated as measured. Theoretical knowledge about the increase of efficiency is practically applied while being implemented in the simulations.
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Improving energy parameters of single-phase induction motors
Dospěl, Leoš ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
Bachelor thesis Improving energy parameters of single-phase induction motors deals with issues of lowering the losses of a small single-phase induction motor J22VV506 from ATAS Elektromotory Náchod a.s.. The first part deals with the theory of asynchronous motors and the issue of losses and their reduction is described in this part as well. In the second part engine parameters are measured and calculated efficiency of the machine and suggested ways to reduce losses. In the last part is measuring motor with the proposed regulation.
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Voltage transformer
Kovařík, Martin ; Huzlík, Rostislav (referee) ; Ondrůšek, Čestmír (advisor)
This bachelor´s thesis focuses on the elements of equivalent circuit parameters of voltage instrument transformer TJC 7-G from the portfolio of ABB. Main focus is placed on correct identification of the leakage reactance of primary and secondary winding, which are used for correct settlement of protections. The measurement is done by using methods of measurement of transformer without load and with short circuited secondary terminal. The values are measured for different frequency levels, in order to determine precisely all the parameters. The theoretical part describes the use of instrument transformers, theoretical creation of equivalent circuit and parameters which affects the accuracy class. The conclusion contains the evaluation of different methods for determining the elements of the equivalent circuit and with its final assembly.
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Optimalization Power Parameter of Small Induction Motors
Chincocolo, Joao Pepino Ndembe ; Grmela, Petr (referee) ; Hájek, Vítězslav (advisor)
Tato bakalářská práce “Optimalizace energetických parametrů asynchronních strojů malého výkonu“ popisuje testovací metody, potřebné ke stanovení ztrát a účinnosti elektrických strojů, se zaměřením na asynchronní stroje. Určuje výpočetní postupy pro vyhodnocení daných měření. Definice uvedených zkoušek jsou sepsány se zřetelem na současné normy. Z informací obsažených v částech s výše uvedeným obsahem vychází prakticky zpracovaný nástroj pro samočinné vyhotovení protokolu z měření. Jedná se o formulář v elektronické podobě. Vstupem formuláře jsou zadané naměřené hodnoty. Výstupem formuláře je protokol o měření, uvádějící výsledky výpočtů a grafy charakteristik. Pro účely této bakalářské práce byl formulář předvyplněn naměřenými hodnotami ze zkoušek konkrétního asynchronního stroje. Související výpočty k určení parametrů stroje jsou uvedeny.
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Parameters identification of the asynchronous machine substituting circuit
Běloušek, Radim ; Cipín, Radoslav (referee) ; Patočka, Miroslav (advisor)
Mathematical model and substituting circuit both include several parameters, which is important to determine for a control. This work is target on identification of parameters of substitute circuit of the asynchronous machine in -network form. The work is divided into several main units. In the first of them are shown the methods of identification of asynchronous machine on the selected machine. The measuring of torque characteristic by classical way with dynamometer and by dynamically with fly-wheels is shown in the next part of this work. The final part of this work is devoted to interpretation and comparison of achieved results.
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