Žilinská univerzita v Žiline

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    Systèmes de traction électrique modernes: avantages des moteurs PMSM dans le transport ferroviaire
    (University of Žilina, 2025) Samaš, Vladimír; Bučko, Martin; Gerlici, Juraj; Dižo, Ján; Blatnický, Miroslav
    Currently, there is a growing global emphasis on environmentally friendly transportation, with railway transport being one of the most efficient and sustainable modes of travel. This form of transport is distinguished by low rolling resistance, which leads to reduced energy consumption for both passenger and freight transport. Electric traction, widely used in railway vehicles, can be categorized as either dependent or independent. Dependent electric traction represents an environmentally friendly solution, as it eliminates the need for petroleum based fuels and instead utilizes electricity drawn from the grid. However, this approach is truly ecological only when the electricity is generated from renewable and sustainable sources. Modern electric traction systems rely on electric motors, and this article aims to provide a detailed analysis of the application of permanent magnet synchronous motors (PMSM) in railway transport, particularly in the context of electric traction. PMSM motors are characterized by high efficiency and excellent controllability, making them well-suited for extensive use in railway applications. Their significant potential in this field positions them as a promising solution for future sustainable and efficient transport systems.
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    Súčasný stav prevodoviek s nastaviteľným prevodovým pomerom pri elektrickom pohone
    (University of Žilina, 2024) Blatnický, Miroslav; Samaš, Vladimír; Dižo, Ján
    The scope of this article covers potential technologies for transmission mechanisms with variable gear ratios that can be applied to electric traction. A transmission with an adjustable gear ratio allows for the adaptation of the gear ratio according to usage conditions. By adjusting the gear ratio and consequently the traction forces, we can enhance driving parameters, e.g. improved both efficiency and range. The paper theoretically examines various transmissions with variable gear ratios and compares their parameters in the context of electric drives.
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    Návrh unikátneho jednoúčelového zariadenia pre skúšky tečenia
    (University of Žilina, 2024) Jakubovičová, Lenka; Piroh, Ondrej; Vaško, Milan; Sága, Milan
    To study the viscoelastic behaviour of polymers, creep test is the most accurate experimental method. This paper presents the engineering design and strength analysis of a special purpose disposable device for performing creep tests of commonly commercially available composite materials, specifically materials fabricated through 3D printing. The device, made of Bosch-Rexroth aluminium profiles, offers flexibility and easy modification to meet different requirements for testing diverse material types. Finite element analysis (FEM) is performed to verify the strength and safety of the device under different load levels. Prior to the actual creep test, a tensile test is performed to obtain material properties such as ultimate strength and maximum elongation. The values obtained are a stepping stone to determine the creep conditions. The results of the finite-element analysis demonstrated the reliability of the equipment for performing the required creep tests and confirmed its suitability for use to perform tests on selected composite materials. The proposed device is also dimensioned for stronger materials in terms of strength, which can be addressed in future studies. The significance of this work lies in providing a cost-effective and customizable solution for creep testing of composite material with wider applications in engineering.