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Efficiency Improvement of Small Induction Motors
Vilím, Martin ; Veselka, František (referee) ; Hájek, Vítězslav (advisor)
In this bachelor´s thesis I discuss about asynchronous engines in general, describe their construction and principle of operation, using. It also includes measurements of a specific motor and design engine. The first part deals with theprinciple of the engine options including the fundamental control over speed and torque. The second part deals with the measurement of the size of the searchengine and losses. The last part provides a proposal for a new induction motor.
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Automotive Alternator Innovation
Volek, Martin ; Hýsek, Roman (referee) ; Hájek, Vítězslav (advisor)
The work deals with the analytical electromagnetic design of automotive claw-pole alternator 14V/120A. This design is verified in program Maxwell with a RMxprt tool. The results of both calculations are compared. Designed alternator is also compared with the results measured in the laboratory on the alternators of similar type. Furthermore, there are analyzed individual power losses of machine and listed options of reducing these losses, which results in an increase in overall efficiency.
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Options for increasing the efficiency of small motors.
Kusý, Karel ; Janda, Marcel (referee) ; Hájek, Vítězslav (advisor)
This bachelor thesis concerns itself with the possibilities of achieving higher efficiency of small asynchronous motors and their manufacturing costs. The following chapters describe the design, function and principles of speed regulation of the asynchronous motor. Next, losses that occur during motor operation and ways of reducing them, are described. The last chapter of the thesis addreses factors that influence the manufacturing costs of the asynchornous motor and evaluates the material costs of one modified motor.
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Modern Systems of Vehicle Lighting
Špaček, Ladislav ; Huzlík, Rostislav (referee) ; Hájek, Vítězslav (advisor)
A vehicle lighting is a basic component of active safeness, which, as an integral part of any vehicle, contributes to road traffic safety increase. From the very beginning, the car electrotechnincs has been engaged in the car lighting and visibility improvment for worse driving conditions, e.g. fog, rain, night ride etc. Thanks to new car lighting systems, such as adaptive headlights, LED based light sources and night vision systems, road traffic became much safer than ever before.
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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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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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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 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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