Wyniki wyszukiwania - BazTech

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Key competences formation and effective support of students mobility at technology faculties: modeling, design and assessment of flexible education concept

Pavlásek P., Simonová A., Koniar D., Hargaš Libor, Špánik P., Uriča T., Prandová A.

Poznan University of Technology Academic Journals. Electrical Engineering

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2018

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No. 96

297--306

EN

The paper brings the results of the current national educational agency project research of effectiveness of the modular didactic cycle with new technologies, methods and forms in student-focused concept through the processing of experimental data of the electronics study program from the period of 2016-2017. Data were collected from contributions kept by the students groups during the preparation phase and also from reflective final phase of the research period. Also, the presented solution and results of the project are directed at the main component of the educational process – the content of education and its compatibility with the technological trends in the actual working environment. The results show that digitization of the learning content and flexibility of design of educational modules with multimedia components are dominant and indicate compatibility with the trends of flexible educational environment. In addition, the results of project illustrates that even the change can be difficult, success can be attained in the most heterogeneous diversification of university education and mobility of graduates of technical universities that will contribute to increase of educational efficiency and will encourage arrival of investments to innovative entrepreneur projects and, mainly, will help national firms to succeed at EU and world market by strengthening of the dominant subject which produces values – the technical field graduate with the key competences for the 21st century needs.

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Design and verification of the chip thermal model: the assessment of a power modules resistance to high current peaks

Pavlásek P., Mrázik M., Pavelek M., Dobrucký B.

Poznan University of Technology Academic Journals. Electrical Engineering

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2018

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No. 95

57--65

EN

The paper is focused on creating a thermal model which provides information about the thermal conditions in the semiconductor devices. Increasing the current density and pressure on prices make the optimization of thermal systems an important part in the design process. Simulation analysis has become with development of computer technology an excellent equipment to achieve it. In creating the model, we take account of material and geometric parameters of bonded chips. By the simulation we obtain the necessary information about the components and thermal stresses, these results can be applied in the device design procedure and technology of production. Resistance to bonded diodes is determined by chip parameters and bonding parameters such as the number of bundles, their spacing, and material. Resistance in practice is determined by experimentally measuring IFSM, a peak permeable, unrepeatable current. Also, in the work we analysed voltage-current VA characteristics of power diodes such as threshold voltage, also the closing voltage we tested functionality and we observe changes in the behaviour of the component and, last but not least, the characteristics of thermal resistance and thermal impedance that served as elements for the construction of an equivalent model. In the next part of the paper, in the context of the works, the methods of bindings of PCB components are currently being extended and used in current technological processes and we also concentrate on the dimensional parameters of the modules used to create an equivalent electrical circuit. The presented assembled simplified model respects the chip size, number of bonding wires, and their layout on the chip. For the concept of nine bonds, we had two types of placement from a variety of bonds, so we also respected this factor in the design of the model. As an example, there is a diode module investigated (SKEE SEMIPACK® 2, 1600V/174A).

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A Simplified Connection of HEV AC/AC Powertrain

Dobrucký B., Drgoňa P., Kaščák S., Praženica M., Pavlásek P.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

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R. 19, nr 6

831--834, CD

EN

The paper deals with a simplified configuration of series HEV hybrid vehicles. Simplification consists of the downsizing of auxiliary 4QC converter needed for hybrid operational modes. Besides, operation in autonomous traction accu-battery modes uses direct 0x5 configuration of traction 3x5 McX matrix converter. Such a configuration can be derived from that main traction converter. Major advantages of simplified connection are beside smaller 4QC converter size – possible little bit better efficiency of the HEV powertrain. Chosen operational modes of modelling and simulation of traction powertrain configuration are focused on start-up and traction drive of HEV powered by ICE, start-up of ICE powered by AB accu-battery using SG as a starter, and traction drive powered by AB accu-battery and braking of traction motor moving energy into accu-battery AB. The results of all simulation experiments are given in the paper.

PL

Artykuł dotyczy uproszczonej konfiguracji pojazdów hybrydowych HEV. Uproszczenie polega na zmniejszeniu konwertera 4QC wymaganego w trybach hybrydowych. Poza tym tryb pracy w trybie autonomicznej trakcji w trybie akumulatorowym wykorzystuje bezpośrednią konfigurację 0x5 trakcyjnego konwertera macierzy 3x5 McX. Taka konfiguracja może być uzyskana z tego głównego konwertera trakcyjnego. Głównymi zaletami uproszczonego połączenia jest mniejsza wielkość konwertera 4QC - możliwa nieco lepsza wydajność układu napędowego HEV. Dostępne są tryby pracy, modelowanie i układ napędowy układu napędowego skoncentrowany na rozruchu i napędzie trakcyjnym HEV napędzanego przez ICE, rozruch ICE zasilany akumulatorem AB z wykorzystaniem SG jako rozrusznika i napęd trakcyjny zasilany przez AB accu - bateria i hamowanie silnika trakcyjnego, które przenosi energię do akumulatora AB. Wyniki wszystkich eksperymentów symulacyjnych podano w pracy.

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Possible operation modes of HEV vehicle with direct AC/AC transfer and 5-phase traction motors

Dobrucký B., Drgoňa P., Kaščák S., Praženica M., Pavlásek P.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 12

528--531, CD

EN

The paper deals with operational modes of HEV vehicle with direct AC/AC transfer and five-phase IM traction motors. Such configuration yields smaller voltage drops compared with the serial AC/DC/AC converter and five-phase machines offer some inherent advantages over their three-phase counterparts. Also, dynamical properties of HEV are better due to the absence of a DC link which has accumulating action. Other advantage includes reduced electromagnetic torque pulsation and also noise characteristics of the five-phase drives are better when compared with the three-phase ones. Possible operational modes enable to provide both the single and/or hybrid operations at driving and braking states.

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Control of hybrid and electrical vehicle with five-phase AC motor

Dobrucký B., Záskalický P., Pavlásek P.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

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R. 18, nr 6

1191--1195, CD

EN

The paper deals with control of series HEV hybrid- and BEV electric vehicles including electronic differential and five-phase traction induction electrical motors. Possibilities of dynamical and directional servo control are greater because of five-phase machines offer some inherent advantages over their three-phase counterpart. Major advantages of using a five-phase machine instead of three-phase ones consists in their higher torque density, greater efficiency, and fault tolerance. Other advantage includes reduced electromagnetic torque pulsation, and reduction in the required rating per inverter leg. Noise characteristics of the five-phase drives are better when compared with the three-phase ones.

PL

W artykule omówiono sterowanie pojazdami elektrycznymi hybrydowymi i HEV typu HEV, w tym elektronicznymi i pięciofazowymi silnikami indukcyjnymi trakcyjnymi. Możliwości dynamicznego i kierunkowego sterowania serwomechanizmem są większe dzięki maszynom pięciofazowym oferującym pewne zalety związane z ich odpowiednikiem trójfazowym. Główne zalety używania maszyny pięciofazowej zamiast trójfazowej polega na ich wyższej gęstości momentu obrotowego, większej wydajności i odporności na uszkodzenia. Inną zaletą jest zmniejszenie pulsacji momentu elektromagnetycznego i zmniejszenie wymaganej wartości znamionowej na stopę falownika. Charakterystyka hałasu napędów pięciodniowych jest lepsza w porównaniu z silnikami trójfazowymi.