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Losses of capacitor run induction motor
Štaffa, Jiří ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
This project deals with increasing efficiency of one phase induction motor with permanent split capacitor. We can whole thesis divide into two parts, the first one is basic and the second is interested in analysis and measurement. First part handles with construction of single phase induction motor, explanation of function principle, start and run of motor. Calculating of efficiency including type of losses, which reduce efficiency. Second part concerns analysis losses including moment load characteristic, motor measurement while rotor is locked, with no load operation, measuring mechanical and additional losses. Further there will be measured useful values for creation model for simulation (reactance of windings etc.). Than will be the model created in ANSYS Maxwell with module RMxprt. After analytic calculation in RMxprt and using Finite Element Method (FEM) load characteristics will be compared together. This comparison gives us information about accuracy of model for simulation. Simulation and measurement will be carried out on another engine with high quality ferromagnetic material used for magnetic circuit of motor. Further will be done simulation of motor with modifications shown in previous chapter for high efficiency.
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Energy parameters of single-phase induction machines
Janáček, Martin ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The master's thesis deals and introduces a single-phase inductions machines, the principle of operation, types of design and operating conditions. This thesis includes analysis of individual losses in the machine and reduce the possibility of different ways. After a theoretical proposal for reducing losses are measured by mass-produced single-phase induction machine. Further machine modifications proposed for reducing losses in the stator windings and designed a prototype machine with the adjustment of the magnetic circuit to reduce iron losses made by ATAS elektromotory Nachod a.s. The results are supplemented by a simulation using software Maxwell RMxprt and finite element method (FEM). Finally, they are compared to each machines modifications mainly in terms of energy consumption.
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Motors for Special Drives
Martinek, Radek ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This project solves electric motor, which are used in specific drives. The aim is to show you the use of electric motor, then direct current motor, shielded pole motor and subsequent upgrade of direct current motor. I focused mainly on DC motors. I performed measurements on several motors APS Světlá nad Sázavou. Then I conducted a design to upgrade the wiper motor. I conducted innovation in the simulation program FEMM, where I was able to achieve a reduction motorcycle while maintaining performance. Benefit from the work of this enhancement is the possibility of small DC motors and possibility of subsequent cooperation with APS Světlá nad Sázavou.
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Impact of winding on induction machine characteristics
Mikmek, Vladislav ; Janda, Marcel (referee) ; Mach, Martin (advisor)
This thesis deals with the analysis of a three-phase winding of an induction engine. After the theoretical introduction concerning different types of windings, two types of their analysis and the importance of the winding factor, two methods of analysis and design tools are explained: Görges diagram and Tingley scheme. This scheme is then used for the design of all possible variants of winding for a certain number of stator slots and the theoretical shape of magnetic field is analysed. The next step is a deeper software analysis of the engines with variants of windings with different coil pitches and number of conductors per slot. Especially the finite element method is used in this part. The obtained values and their characteristics of the simulated engines are compared numerically and graphically. Then the changes of important values for different windings are described. The optimal winding according to chosen requirements is chosen.
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Design and analysis of single-phase induction machine
Souček, Jiří ; Mach, Martin (referee) ; Vítek, Ondřej (advisor)
This thesis deals with the design issues of single-phase induction motors. The content is divided into several basic parts. The first chapter deals with the principle function of single-phase induction motors. In particular, the asymmetry of these machines discussed with regard to the importance of connecting the auxiliary stage and its character. The following part is devoted to the analytical calculation of specific single-phase two-pole motor. I analyzed two-pole motor because at that time there were not available data for six-pole motor from Siemens. The calculation is performed according to the literature, and the resulting parameters are then compared with the model of this motor created by RMxprt. There is model of six-pole induction motor created by Ansoft/Maxwell in third part. This model shows the influence of skew of the rotor slots on the torque of machine. Then I performed measurement of this motor and analyzed of results in the last part.
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Impact of core length on efficiency of a single phase induction machine
Binek, Martin ; Hájek, Vítězslav (referee) ; Mach, Martin (advisor)
This bachelor's thesis analyses the impact of core length on efficiency of a single phase induction machine with a run capacitor in the auxiliary winding. The whole thesis can be divided into two parts. The first part of the thesis includes general knowledge concerning single phase induction machines and technical base for its analytical calculation. The second part works with the actual technical documentation of a motor. This part includes creation of the motor model in RMxprt module, analytical calculation for verifying the motor properties and laboratory measurement, where the results are primarily compared to RMxprt simulation as well as to the analytical calculation, mainly from the efficiency perspective.
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Optimization of a small induction machine.
Jedlička, Lukáš ; Knebl, Ladislav (referee) ; Mach, Martin (advisor)
The goal of this thesis is to improve efficiency of an induction motor. In the first part, the working principle is described. The next part deals with the origin of losses and possible solutions to decreasing losses without impacting the production possibles. The third part of the thesis is focused on the calculation of parameters of a small serial production motor. In the fourth part, these parameters are verified using the analytical tool RMxprt which is included in Ansys Maxwell. The fifth chapter deals with the optimization using Matlab genetic algorithm. In the final chapter, the design modifications are verified using the method of finite element Ansys Maxwell 2D.
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Low power electrical machines
Martinek, Radek ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The master’s thesis introduces various types of electric motors. Overall, it is divided into 6 chapters, which the first deals with special type of electric motors, namely: permanent magnet DC motor with coreless winding, piezoelectric motor and three phase induction motor with solid rotor. For all of these motors are introduced principles, types, advantages, disadvantages and applications. The second part of thesis deals with perspective types of motors, namely: single phase induction motor and reluctance motor. For all of these motors are introduced principles, types, advantages, disadvantages and applications. The third chapter deals with analysis parameters of single phase induction motor. The analysis is performed on a borrowed motor from ATAS company by measurement and verification using simulation program Ansys Maxwell. The fourth part discusses the possibilities of increasing the effectiveness of borrowed electric motor. The following is chapter five, which deals with increasing the efficiency of the motor by changing metal sheets. Results are verified by simulations with Ansys Maxwell and measurements on sample of electric motor. The last part presents electric motor design with new selected electric sheets with lower specific losses, but also with lower magnetic induction.
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Analysis and Optimisation Power Parameter of Small Induction Motors
Pařízek, Jiří ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This thesis deals with the asynchronous engines, describes their structure, principles, properties, use, and briefly describes the design of three-phase asynchronous motor. The first section describes the most common three-phase induction motor, the emergence of the rotating magnetic field and the basic relationships. The second part deals with asynchronous motors for specific applications, their design and features. The next section is an analysis engine borrowed from the electric company ATAS Náchod, and The last section lists ways to improve the basic parameters of induction motors designed and optimized engine.
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Special low-power induction motors.
Belica, Andrej ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
Master thesis deals with design and construction of the most widely used engines currently. Overall, it is divided into five chapters, the first chapter deals with constructional features of various three-phase asynchronous motors, the second chapter briefly paid attention to single-phase motors. The next chapter focuses on the specific engine types, which differ from standard induction motors in its design implementation. This is an engine with full rotor, hysteresis, linear and with shaded field. Although asynchronous motors are considered the most reliable machines work in imperfect conditions, it leads to frequent breakdowns. This is covered in chapter four. Based on the findings from previous chapters the fifth chapter includes a preliminary draft of the asynchronous motor with a full rotor. The last chapter is devoted to the measurement on functional models.
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