Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"Slawomir WIAK"

Nonlinear phenomena in tank of transformer and power losses computations

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The paper presents the design methodology of magnetic screens based on the three-dimensional field calculations. In this paper a new approach on the designing of the magnetic screens covers located on the tank is presented, so as to determine the optimal geometry (i.e. their thickness), that minimizes the aggregate losses not only in the tank but also in the configuration screen - tank. The transformer model was developed using the field-circuit oriented excitation. The load corresponds to the actual transformer's grid connected operating conditions. The electromagnetic field analysis leads to the identification of high loss density points in the structure. Streszczenie. W pracy przedstawiono metodologię projektowania ekranów magnetycznych na podstawie trójwymiarowych obliczeń polowych. Zaprezentowano nowe podejście w projektowaniu ekranów magnetycznych umieszczonych na ściankach kadzi w celu ustalenia jej optymalnej geometrii (grubości), w celu minimalizacji łącznych strat nie tylko w kadzi, ale również w konfiguracji ekran - kadź. Model transformatora został opracowany jako polowo-obwodowy. Przyjęto znamionowe obciążenie transformatora. Przeprowadzona analiza pola elektromagnetycznego ma na celu identyfikację obszarów o wysokiej gęstości strat w badanym obiekcie. (Analiza zjawisk nieliniowych oraz strat w kadzi transformatora). Keywords: High power transformer, transformer tank, magnetic screens, power losses, 3D modeling. Słowa kluczowe: Transformatory dużych mocy, kadź transformatora, ekrany magnetyczne, straty mocy, Modelowanie 3D. Structure of the transformer To build 3D structure of the transformer OPERA-3D code has been exploited. The electromagnetic field calculations are based on combining in predefined subdomains magnetic vector potential, total and reduced magnetic potential formulas. The computer model of the transformer is created for over 24 millions finite elements ("Fig. 1"). FEM mesh has been defined more dense in the [...]

ViMeLa Project: An innovative concept for teaching mechatronics using virtual reality DOI:10.15199/48.2019.05.05

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Nowadays, traditional education and teaching methods, although with significantly improved teaching techniques, can not keep enough interest of the students that grew up with Internet, mobiles and tablets. Especially sensitive to these issues are students in engineering, in particular, in mechatronics. Modern information technology is rapidly being adopted in Mechatronics Engineering education as a tool for enriching the practical experience of the students. The practical training is a vital part of Mechatronics Engineering education [1]. However, the high cost needed to implement laboratory experiments (for educational purposes) led to development of virtual facilities where physical systems can be virtually controlled via the Virtual Reality (VR) simulations. Multimedia and VR technologies offer great potential for presenting theory and laboratory experiments in an enhancing and interesting, but in an economical, way. Teaching and learning Mechatronics Mechatronics is synergy and interaction of mechanical, electrical and computer systems as seen in Fig. 1. Hence, it is an interactive combination of mechanical engineering, electronic control and computer technology, with the aim of achieving an ideal balance between mechanical structure and its overall control and performance. Fig.1. Structure and key elements of mechatronics Currently, mechatronics classes are divided into two parts: the theoretical lectures and laboratory courses with experiments following the "learning by doing" model. Expensive equipment and limited time for training do not provide sufficient educational platforms [2,3]. In some cases the students conduct based simulations and learn how mechatronic systems and devices operate in reality, despite it may seem abstract and unclear for students, and does not fully reflect the physical phenomena of particular processes. The described drawbacks of mechatronics study are greatly improved when classroom teac[...]

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