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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 40
Uzel, David , Peroutka, Zdeněk
Steady state torque optimal operating point control for wound rotor synchronous motors

This paper discusses steady state optimal control of the motor from the maximum torque point of view. The motor behavior is researched with a vector control supply in the full speed range. The optimal considerations are compared with a behavior of the classical control structu...

Jára, Martin , Blahník, Vojtěch
Cost-effective medium-power charging station for public transport vehicles

Charging stations are becoming an important part of the modern urban infrastructure. This paper describes a concept of a standalone cost-effective medium power charging station dedicated for electric bus charging. It is based on a voltage-source active rectifier operating in both current...

Brychcín, Jiří , Košan, Tomáš , Janík, Dušan , Peroutka, Zdeněk
Simulation and control of FLC converters for UPS systems

This paper is focused on simulation of the diesel or gas electric central, which is used for uninterruptible power supply (UPS) with permanent magnet synchronous generator (PMSG) and flying capacitor converters (FLC).

Blahník, Vojtěch , Talla, Jakub
Study of 3.3 MW voltage-source active rectifier

This paper deals with the behavior and stability of three-phase voltage-source active rectifier with rated power 3.3 MW. This high-power converter is connected to power grid via transformer and input clean power filter. The main purpose of the article is check the stability of ...

Blahník, Vojtěch , Talla, Jakub
Single-phase synchronization for traction active rectifier

This paper introduces the advanced synchronization method second order general integrator phase locked loop modified especially for voltage synchronization exclusively for traction active rectifier. Designed synchronization is characterized by resistance to interfaces and especially quick response to frequency&...

Bláha, Štěpán , Komrska, Tomáš , Šmídl, Václav , Glasbergerová, Vendula , Peroutka, Zdeněk
Multi-harmonic LQ control of single-phase converter with LCL filter

Control of single-phase converters connected to the grid via an LCL filter is a demanding issue due to risk of oscillations. A linear-quadratic (LQ) controller enabling besides standard pure sine control also a multi-harmonic current reference is proposed in the paper. Such a desig...

Pistulková, Alena , Tupa, Jiří , Martinek, Lukáš
Implementace procesního řízení u poskytovatelů zdravotnických služeb

This papers deals with the possibilities of implementation of process management in health care facilities. Emphasis is placed on clarity, simplification of processes to a level that meets legislative and standardization requirements, but minimizes the administrative burden on health professionals.

Pánek, David , Karban, Pavel , Doležel, Ivo
Calibration of numerical model of magnetic induction brazing

A method of finding the temperature dependences of physical parameters of metals is proposed and discussed. The method is based on the combination of measurement of the surface temperature of the material and subsequent solution of the inverse problem using the multi-parametric optimiza...

Hirman, Martin , Navrátil, Jiří , Steiner, František , Džugan, Tomáš , Hamáček, Aleš
Alternative technology for SMD components connection by non‑conductive adhesive on a flexible substrate

This article deals with the assembly of SMD chip components onto a flexible substrate by using non-conductive adhesives. In the experiments, two electrically conductive adhesives (ECA) and two non-conductive adhesives (NCA) were used. The verification of the properties and usability of NCAs&...

Syrový, Tomáš , Maronová, Stanislava , Kuberský, Petr , Ehman, Nanci Vanesa , Vallejos, María E. , Pretl, Silvan , Felissia, Fernando E. , Area, María Cristina , Chinga-Carrasco, Gary
Wide range humidity sensors printed on biocomposite films of cellulose nanofibril and poly(ethylene glycol)

Cellulose nanofibril (CNF) films were prepared from side streams generated by the sugarcane industry, that is, bagasse. Two fractionation processes were utilized for comparison purposes: (1) soda and (2) hot water and soda pretreatments. 2,2,6,6‐Tetramethylpiperidinyl‐1‐oxyl‐mediated oxidation was applied ...

Trnka, Pavel , Trnková, Magdaléna
Správa aktiv a potřeba diagnostiky v Průmyslu 4.0

High demands on the economy of the power grids operation press the operators of electrical machinery and equipment to invest effectively to the management of the machines operation, maintenance, and renewal. At present, a number of concepts of management of important electrical machines...

Dániel, Vladimír , Inneman, Adolf , Veřtát, Ivo , Báča, Tomáš , Nentvich, Ondřej , Urban, Martin , Stehlíková, Veronika , Sieger, Ladislav , Skala, Petr , Filgas, Robert , Zadražil, Vojtěch , Linhart, Richard , Masopust, Jiří , Jamroz, Tomáš , Pína, Ladislav , Maršíková, Veronika , Mikuličková, Lenka , Belas, Eduard , Pospíšil, Stanislav , Vykydal, Zdeněk , Mora, Yesid , Pavlica, Richard
In-orbit commissioning of Czech nanosatellite VZLUSAT-1 for the QB50 mission with a demonstrator of a miniaturised lobster-eye X-ray telescope and radiation shielding composite materials

This paper presents the results of in-orbit commissioning of the first Czech technological CubeSat satellite of VZLUSAT-1. The 2U nanosatellite was designed and built during the 2013 to 2016 period. It was successfully launched into Low Earth Orbit of 505km altitude on June 23,...

Kindl, Vladimír , Byrtus, Miroslav , Skala, Bohumil , Kůs, Václav
Key assembling issues relating to mechanical vibration of fabricated rotor of large induction machines

In many applications, where rotating machines of high power are used, high demands on reliability and safety are laid. Precise manufacturing procedures has to be kept even in case of machines retrofits when e.g. rotors are newly assembled. Even small inaccuracies or misguiding the&...

Franc, Jiří , Pechánek, Roman , Kindl, Vladimír , Zavřel, Martin
Ventilation system with skewed rotor cooling ducts of 40-MW synchronous machine: a case study

This paper describes modified ventilation system and thermal analysis of low-power 40-MW turbo generator. The study compares thermal behaviour of the machine for three different arrangements of the rotor ventilation ducts. Variations of both the sub-slot and the radial ducts are analysed.&#x...

Mach, Pavel , Geczy, Attila , Polanský, Radek , Bušek, David
Glass transition temperature of nanoparticle-enhanced and environmentally stressed conductive adhesive materials for electronics assembly

In our paper, the characterization of glass transition temperature (Tg) was performed for one- and two-component electrically conductive adhesive used in electronic joining technologies. Both adhesives were of the epoxy type with the silver filler. Dynamic mechanical analysis (DMA) was used ...

Streit, Luboš , Talla, Jakub , Janda, Martin
Tram LC filter stabilization by Energy Storage system

The paper is focused on the tram input LC traction filter stabilization by the Energy Storage System. The input LC filter is almost undamped resonant circuit which is mainly excited by the motor constant torque command. The tram during voltage drops increases the current flow&...

Štork, Milan , Mayer, Daniel
Direct currents in power transformers

The article is devoted to the physical nature of geomagnetism, magnetic storms and methods of predicting their origin and deals with geomagnetic induced currents called GIC (Geomagnetically Induced Currents) and their effect on power transformers. A simplified, single-phase transmission system is...

Burian, Petr , Broulím, Pavel , Bergmann, Benedikt
Study of power consumption of Timepix3 detector

The Timepix3 readout chip - the latest member of the Medipix family of hybrid pixel detectors - brought several new functionalities in comparison with the older Timepix, i.e. a high hit-rate, a time granularity of 1.5625 ns, a data-driven readout scheme (with a per pixel ...

Burian, Petr , Broulím, Pavel , Bergmann, Benedikt , Georgiev, Vjačeslav , Pospíšil, Stanislav , Pušman, Lukáš , Zich, Jan
Timepix3 detector network at ATLAS experiment

We describe the technical design and show results of first measurements of a network based on the Timepix3 and the Katherine readout (with Gigabit Ethernet interface) installed in the ATLAS cavern in the LHC in January 2018. The network consists of four Timepix3 detectors, arr...

Kotlan, Václav , Hamar, Roman , Pánek, David , Doležel, Ivo
Model of depositing layer on cylindrical surface produced by induction-assisted laser cladding process

A model of hybrid cladding on a cylindrical surface is built and numerically solved. Heating of both substrate and the powder material to be deposited on its surface is realized by laser beam and preheating inductor. The task represents a hard-coupled electromagnetic-thermal problem...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 40