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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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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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Simulation of small single-phase transformer
Nevřivý, Tomáš ; Hájek, Vítězslav (referee) ; Vítek, Ondřej (advisor)
This bachelor‘s thesis deals with the complex design of single-phase transformer for low power transfer. The basis of the work is procedure of design referred to standardized tables together with the analytical calculation of all transformer parameters. The calculated parameters are verified using by finite element method in the environment of the program FEMM. Analytical calculation is verified by simulation in stationary and quasistationary magnetic field. The conclusion of the work is supplemented by measurement of the transformer, which according to the calculated parameters was made by company of ELEKTROKOV, Inc.
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Determination Parameters of Synchronous Machines according to Measurement
Hrtáň, Michal ; Vaněk, Jaromír (referee) ; Hájek, Vítězslav (advisor)
This "Determination Parameters of Synchronous Machines according to Measurement" bachelor thesis describes methods of tests necessary to determine loss and efficiency of electrical machines with focus on synchronnous ones. It determines calculation procedures for evaluating the measurements. Furthermore, it deals with measuring mechanical vibrations and noise of an electrical machines. Definitions of given tests are written up with regards to contemporary norms. From above mentioned information comes a serviceable tool for automatic measurement protocol generation, which is an electronic form. The measured values are the input of the form. The output of the form is the measurement protocol with results of calculation and graphs of characteristics. For the thesis purposes, the form was filled in with acquired values from tests of a specific synchronnous machine. The related calculations for determining the machine parameters are stated.
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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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Parameter Identification of Induction Motor Equivalent Circuits
Karpenko, Oleksii ; Cipín, Radoslav (referee) ; Toman, Marek (advisor)
In the control of an asynchronous motor, it is important to determine the parameters of its replacement connection with the greatest accuracy. This work focuses on the identification of these parameters by various methods, which are represented in the form of a -network and a T-network. The bachelor thesis is divided into five parts. The first part focuses on the theory of the asynchronous motor, its use, distribution and properties. The second part deals with replacement connections of the asynchronous motor, their specifics and the possibility of its conversion. The third chapter focuses on the theoretical procedures of parameter identification using various methods as well as the theory of engine tests. In the last two chapters, the theoretical findings from the previous parts are experimentally verified on a real engine sample. Subsequently, the results obtained by different methods were compared with each other.
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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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Simulation of small single-phase transformer
Nevřivý, Tomáš ; Hájek, Vítězslav (referee) ; Vítek, Ondřej (advisor)
This bachelor‘s thesis deals with the complex design of single-phase transformer for low power transfer. The basis of the work is procedure of design referred to standardized tables together with the analytical calculation of all transformer parameters. The calculated parameters are verified using by finite element method in the environment of the program FEMM. Analytical calculation is verified by simulation in stationary and quasistationary magnetic field. The conclusion of the work is supplemented by measurement of the transformer, which according to the calculated parameters was made by company of ELEKTROKOV, Inc.
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Determination Parameters of Synchronous Machines according to Measurement
Hrtáň, Michal ; Vaněk, Jaromír (referee) ; Hájek, Vítězslav (advisor)
This "Determination Parameters of Synchronous Machines according to Measurement" bachelor thesis describes methods of tests necessary to determine loss and efficiency of electrical machines with focus on synchronnous ones. It determines calculation procedures for evaluating the measurements. Furthermore, it deals with measuring mechanical vibrations and noise of an electrical machines. Definitions of given tests are written up with regards to contemporary norms. From above mentioned information comes a serviceable tool for automatic measurement protocol generation, which is an electronic form. The measured values are the input of the form. The output of the form is the measurement protocol with results of calculation and graphs of characteristics. For the thesis purposes, the form was filled in with acquired values from tests of a specific synchronnous machine. The related calculations for determining the machine parameters are stated.
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