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Návrh synchronního spoke motoru
Kopecký, Jan ; Bulín, Tomáš (oponent) ; Knebl, Ladislav (vedoucí práce)
Práce je zaměřena v první části na teoretickou rešerši oblasti týkající se synchronních motorů s permanentními magnety. Dále jsou rozebírány jednotlivé metody návrhu magnetického obvodu motoru a porovnávány jejich výhody a nevýhody. V poslední části je navrhnuta odporová síť pro zadaný motor, pomocí níž je vypočtena magnetická indukce ve vzduchové mezeře a vnitřní moment motoru. Výsledky jsou následně porovnány s metodou konečných prvků.
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Design of synchronous reluctance motor with permanent magnets
Knebl, Ladislav ; Huzlík, Rostislav (oponent) ; Ondrůšek, Čestmír (vedoucí práce)
In these days a huge emphasis is put on efficiency of electric devices, both from the side of the owner as well as from the legislation. In the case of electric motors the best efficiency can be achieved with a surface mounted permanent magnet (SMPM) motor, which may be, even in the case of small machines, higher than 90%. Unfortunately, these motors are expensive, because rare earth magnets, such as neodymium magnets, are used, and use of the AC drive system is required. Because of its high price, engineers are trying to find a cheaper machine with parameters similar to SMPM solution. Permanent magnet assisted synchronous reluctance (PMASR) motor is one possible replacement for SMPM. This machine is cheaper, because smaller amount of magnets and still similar or even better characteristics could be achieved, but still the AC drive needs to be used. With PMASR topology it is possible to use low-cost ferrite magnets to replace expensive neodymium magnets, thus the machine will be cheaper. In this work, there will be PMASR topology explained more thoroughly, including the electromagnetic design process. Analytical analysis will be performed on a chosen optimal model. Results of the FE analysis will be evaluated with the analytical model. The prototype will be manufactured from the optimal designed model. The measured data from the prototype will be compared with the calculated data.
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Design and Optimization of High-Torque Ferrite Assisted Synchronous Reluctance Motor
Knebl, Ladislav ; Rafajdus,, Pavol (oponent) ; DUŠEK,, Jiří (oponent) ; Vítek, Ondřej (vedoucí práce)
The high-torque assisted synchronous reluctance machine could be still considered, based on the relatively low amount of publications, as a rather unknown area of research. This and other main advantages, such as low manufacturing cost and a higher torque density of this machine type are driving researchers interest. Even though this machine type has become more interesting in the conventional or high-speed applications, the area of traction applications is slowly getting forward as the machine capabilities are discovered. This thesis is serving just this purpose of developing the ship propulsion driving motor, that is capable of sustaining the high-torque at low-speed. The application is defined by the 55 kW at 150 rpm using the low- cost ferrite magnets aiming to lower the cost. The design will be closely tied with optimization algorithms to deliver the best possible performance in the given volume. However the design challenge being difficult task on its own, the thesis is declaring other goals within, that are still very interesting and important. Since the optimization is included in the design process, the first goal, concluding from the given topic is to compare various optimization methods. Not only the two different optimization algorithms, self-organizing migrating algorithm and genetic algorithm, will be compared in the thesis, but even two multi-objective optimization approaches will be compared as well. The preference based vector and ideal multi-objective optimization techniques comparison will be demonstrated in one optimization scenario with a higher amount of optimized parameters. Other demonstrated goal within the thesis is the comparison of ideal multi-objective optimization with a lower number of parameters. The last goal will be the measurement of the designed and optimized machine, that introduced variety of challenges itself and all of them will be discussed within the last chapter.
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Typová zkouška spínacího přístroje
Knebl, Ladislav ; Dostál, Lukáš (oponent) ; Valenta, Jiří (vedoucí práce)
Jištění elektrických obvodů v elektrických instalacích domů pomocí jističů je jednou z nejpoužívanějších ochran proti nadproudům v obvodu. V síti nízkého napětí byly nahrazeny pojistky pomocí jističů, z tohoto důvodu je kladen velký důraz na jejich kvalitu a bezpečnost uživatele. Tato práce se zabývá principem jističe, jeho funkcí, požadavkům na jeho konstrukci a požadavkům kladeným na typovou zkoušku, které je výrobce povinen splnit před uvedením jističe na trh. Tyto podmínky jsou stanoveny v normě ČSN EN 60898-1. Dále bude v této práci uveden konkrétní typ jističe, na kterém bude proveden vybraný sled zkoušek popsaný v normě.
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Design and Optimization of High-Torque Ferrite Assisted Synchronous Reluctance Motor
Knebl, Ladislav ; Rafajdus,, Pavol (oponent) ; DUŠEK,, Jiří (oponent) ; Vítek, Ondřej (vedoucí práce)
The high-torque assisted synchronous reluctance machine could be still considered, based on the relatively low amount of publications, as a rather unknown area of research. This and other main advantages, such as low manufacturing cost and a higher torque density of this machine type are driving researchers interest. Even though this machine type has become more interesting in the conventional or high-speed applications, the area of traction applications is slowly getting forward as the machine capabilities are discovered. This thesis is serving just this purpose of developing the ship propulsion driving motor, that is capable of sustaining the high-torque at low-speed. The application is defined by the 55 kW at 150 rpm using the low- cost ferrite magnets aiming to lower the cost. The design will be closely tied with optimization algorithms to deliver the best possible performance in the given volume. However the design challenge being difficult task on its own, the thesis is declaring other goals within, that are still very interesting and important. Since the optimization is included in the design process, the first goal, concluding from the given topic is to compare various optimization methods. Not only the two different optimization algorithms, self-organizing migrating algorithm and genetic algorithm, will be compared in the thesis, but even two multi-objective optimization approaches will be compared as well. The preference based vector and ideal multi-objective optimization techniques comparison will be demonstrated in one optimization scenario with a higher amount of optimized parameters. Other demonstrated goal within the thesis is the comparison of ideal multi-objective optimization with a lower number of parameters. The last goal will be the measurement of the designed and optimized machine, that introduced variety of challenges itself and all of them will be discussed within the last chapter.
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Preference Based And Ideal Multi-Objective Optimization Applied On Hightorque Ferrite Assisted Synchronous Reluctance Machine
Knebl, Ladislav
This paper introduces comparison of optimization algorithms applied on high-torqueferrite-assisted synchronous reluctance machine. The comparison is focused not solely on two algorithmswithin the same multi-objective optimization approach - preference based or ideal, but also oncomparison of these two approaches. The genetic algorithm and self-organizing migrating algorithmin both approaches are used to find optimal solution. The optimization goal is an optimal parametercombination to achieve the highest torque and power factor, while developing the lowest torque ripple.The optimized design will be evaluated by the 2D finite element analysis in steady-state analysis.
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Tvorba GUI pro optimalizaci elektrických strojů
Bártková, Tereza ; Klíma, Petr (oponent) ; Knebl, Ladislav (vedoucí práce)
Tato práce sleduje vznik grafického uživatelského prostředí od výběru nástrojů po realizaci. Smyslem bylo udělat zadaný program přívětivější k používání vytvořením reprezentativní komunikační vrstvy mezi programem a uživatelem a ukázat jeho funkce. Nejprve byl proveden rozbor různých programovacích jazyků a jejich nástrojů pro tvorbu grafických rozhraní. Z těchto byl vybrán jazyk Python, protože zadaný program je napsán v Pythonu, navíc vývoj aplikací v něm probíhá patrně nejefektivněji. Dále jsou rozebírány vlastnosti tohoto jazyka a PyQt, což je nástroj, který je možné využít k samotné tvorbě grafického rozhraní. Třetí kapitola je věnována problematice elektrických strojů a jejich optimalizaci. Jsou zde představeny některé algoritmy v praxi používané pro zlepšení charakteristik elektromotorů. V následující kapitole je nastíněn zadaný typ motoru a popsán konkrétní stroj, pro který je výsledný program určen. Poté je podrobně popsán layout aplikace realizovaný v Qt Designeru. Je vysvětlena nová struktura programu obohacená o grafické prostředí a popsán chod programu. Nakonec je vysvětleno jak program použít, je provedena optimalizace zadaného stroje a jsou interpretovány výsledky.
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Vysokootáčkový synchronní stroj s vnějším rotorem
Král, Radek ; Knebl, Ladislav (oponent) ; Klíma, Petr (vedoucí práce)
Diplomová práce se zabývá konstrukcí a návrhem vysokootáčkového synchronního stroje s vnějším rotorem. Práce je uspořádána do tří hlavních kapitol. První kapitola se zabývá teorií návrhu stroje a také mechanickými limity, které jsou u vysokootáčkových strojů významné. V této kapitole jsou také uvedeny příklady aplikací těchto elektrických strojů. V druhé kapitole je analyticky spočten výchozí návrh stroje. Tento návrh stroje je optimalizován a ve třetí kapitole této práce jsou znázorněny výsledky simulací metodou konečných prvků včetně vyhodnocení těchto výsledků.
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Permanent Magnet Assisted Synchronous Reluctance Motor
Knebl, Ladislav
In these days, there is big emphasis put on electric motors efficiency, the best efficiency can be achieved with surface mounted permanent magnet (SMPM) motor. The SMPM motors efficiency may be even in cases of small machines, higher than 90%. Unfortunately this kind of motor is expensive, because neodymium magnets are used. The synchronous reluctance assisted motor (SRAM) topology is one of many possible machines that might in some cases replace the SMPM machines. Because cheap ferrite magnets are used and still similar characteristics can be achieved.
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Optimization Of Interior Permanent Magnet Synchronous Motor Using Evolutionary Optimization Algorithm
Knebl, Ladislav
The development of the interior permanent magnet synchronous motor has drawn a big interest over the last decade. This is due to the use of this kind of machine in the automotive industry, thanks to the machine high efficiency and high overload capability compare to other machine types. Using artificial intelligence or evolutionary optimization algorithms is possible to optimize the motor with maximum efficiency, lowest torque ripple and highest average torque, because a huge ammount and variety of geometry combinations are tested. This paper is focused on the overview of generally used optimization algorithms and optimization is demonstrated on Self-Organizing Migrating Algorithm (SOMA). Cost function and weight coefficients are also presented and used for optimization.
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