Wyniki wyszukiwania dla: MAGNETOELECTRIC VOLTAGE COEFFICIENT - MOST Wiedzy

Wyszukiwarka

Wyniki wyszukiwania dla: MAGNETOELECTRIC VOLTAGE COEFFICIENT

Wyniki wyszukiwania dla: MAGNETOELECTRIC VOLTAGE COEFFICIENT

  • Magnetoelectric effect in (BiFeO3)x–(BaTiO3)1-x solid solutions

    Publikacja

    - MATERIALS SCIENCE-POLAND - Rok 2015

    The aim of the present work was to study magnetoelectric effect (ME) in (BiFeO3)x–(BaTiO3)1x solid solutions in terms of technological conditions applied in the samples fabrication process. The rapidly growing interest in these materials is caused by their multiferroic behaviour, i.e. coexistence of both electric and magnetic ordering. It creates possibility for many innovative applications, e.g. in steering the magnetic memory...

    Pełny tekst do pobrania w portalu

  • Mössbauer Spectroscopy and Magnetoelectric Effect Studies of Multiferroic Ceramics Based on BiFeO<sub>3</sub>

    Publikacja

    - Key Engineering Materials - Rok 2014

    In this work the results of investigations for (BiFeO3)x(BaTiO3)1-x and Bi1-xNdxFeO3 solid solutions are described. Samples were prepared by the conventional solid-state sintering method. X-ray diffraction, 57Fe Mössbauer spectroscopy, and magnetoelectric effect measurements were applied as complementary methods to determine the structure and magnetic properties of materials. For (BiFeO3)x(BaTiO3)1-x solid solutions Mössbauer...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • X-Ray Diffraction, Mössbauer Spectroscopy and Magnetoelectric Effect Studies of Multiferroic Bi5Ti3FeO15 Ceramics

    Publikacja

    - ACTA PHYSICA POLONICA A - Rok 2015

    Bi5Ti3FeO15 ceramics belongs to multiferroic class of materials. In this work it was prepared by solid-state sintering method and investigated by X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect measurements. As it was proved by X-ray diffraction studies the single-phase Bi5Ti3FeO15 compound was obtained. The Mössbauer investigations revealed paramagnetic character of the compound at room temperature as well...

    Pełny tekst do pobrania w portalu

  • Dynamics of fault arc traveling along busbars in high voltage switchboards = Dynamika łuku zwarciowego przemieszczającego się wzdłuż szyn rozdziel-nic wysokiego napięcia

    Publikacja

    The paper presents the results of magnetic induction and electrodynamic force calculations acting on arc column during short-circuit in medium voltage air-insulated bus-bars. The gap between the bars was 120 mm and the prospective short-circuit currents ranged from 4 kA to 8 kA. The paper also shows the measurement results of average velocity fault arc depending on currents arc diameter and arc current was established and described....

    Pełny tekst do pobrania w portalu

  • Highly stable CsFAPbIBr perovskite solar cells with dominant bulk recombination at real operating temperatures

    Publikacja
    • B. Romero
    • S. Delgado
    • D. Głowienka
    • C. Chang
    • G. Del Pozo
    • B. Arredondo
    • D. Martín-Martín
    • P. Contreras
    • Y. Galagan

    - Sustainable Energy & Fuels - Rok 2023

    Mixed-cation mixed-halide perovskite solar cells have been characterized in DC at different temperatures (from −20 °C up to 50 °C) and the time evolution of the device efficiency has been assessed using different degradation protocols (indoors and outdoors). The completely planar p–i–n structure is ITO/CuNiOx/PTAA/CsFAPbIBr/PCBM/PEI/Ag. Pristine current–voltage characteristics barely show hysteresis, at any temperature. Open circuit...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Nonlinear electrical properties of glass-ceramics nanocomposites containing ferroelectric nanocrystallites of Bi2VO5.5

    Nonlinear A.C. impedance measurements were conducted in the 50BiV-50SrBAlO nanocomposite as a function of frequency, temperature and A.C. voltage. This material is ferroelectric below temperature of 730 K, and above 730 K is a good ion-conductor. For this nanocomposite a low A.C. voltage of 1 V rms is enough to observe high nonlinearities. The origin of these nonlinear effects depends on the temperature and frequency. In the high...

    Pełny tekst do pobrania w portalu

  • Multi-Channel Virtual Instrument for Measuring Temperature—A Case Study

    Publikacja

    - Electronics - Rok 2023

    The article presents the hardware and software configuration of the developed multi-channel temperature measurement system as well as calibration procedures and measurement results verifying the properties of measurement channels. The system has been developed and dedicated primarily for measuring the temperature distribution in a laboratory model simulating underground power lines. With the adopted configuration of the analog...

    Pełny tekst do pobrania w portalu

  • The impact of material degradation on the resistance and reliability of truss structures

    Publikacja

    The paper analyses limit load-carrying capacity and buckling load of truss towers used to support high voltage power lines. The analysed typical structure was subjected to characteristic loads and their combinations. The results were applied to assess structural resistance with regard to steel corrosion in the long-term operation. The extent of structural deterioration was assessed due to Young's modulus decrement in the course...

  • Methods of trend removal in electrochemical noise data – overview

    Publikacja

    In this paper we shall review popular methods of trend removal from electrochemical noise time records. The basic principles of operation of the six most popular methods are explained. The proposed methods are: high - pass filtering, Moving Average Removal, polynomial detrending, wavelet detrending, Empirical Mode Decomposition and Variational Mode Decomposition. Estimation of trend removal quality...

    Pełny tekst do pobrania w portalu

  • Voltage Conditions in Low Voltage Grid with Connected Mictogeneration

    Publikacja

    The introduction of distributed generation into a low voltage grid may cause voltage problems in it. The paper discusses the effect of microgeneration on voltage levels in a low voltage grid. A real low voltage grid of considerable length was selected for the analysis. The grid primarily supplies residential buildings in a rural area. Results of tests that consider potential measures which could be applied in this grid to improve...

    Pełny tekst do pobrania w portalu

  • Compensation Topologies in IPT Systems: Standards, Requirements, Classification, Analysis, Comparison and Application

    Publikacja

    - IEEE Access - Rok 2019

    Wireless power transfer devices are becoming more relevant and widespread. Therefore, an article is devoted to a review, analysis and comparison of compensation topologies for an inductive power transfer. A new classification of topologies is developed. A lot of attention is paid to the problems of the physical fundamentals of compensation work, standards, safety, and five main topology requirements. It is determined, that topologies...

    Pełny tekst do pobrania w portalu

  • A Development of a Capacitive Voltage Divider for High Voltage Measurement as Part of a Combined Current and Voltage Sensor

    Publikacja

    - Elektronika Ir Elektrotechnika - Rok 2020

    This article deals with the development of capacitive voltage divider for high voltage measurements and presents a method of analysis and optimization of its parameters. This divider is a part of a combined voltage and current sensor for measurements in high voltage power networks. The sensor allows continuous monitoring of the network distribution status and performs a quick diagnosis and location of possible network failures....

    Pełny tekst do pobrania w portalu

  • Voltage Transients Transfer over Medium Voltage Instrument Transformers

    Publikacja

    - Rok 2011

    This paper presents voltage harmonic transfer accuracy problems through voltage transformers which are used in power quality monitoring systems in medium and high voltage grids. A simplified lumped parameters circuit model of the voltage transformer is proposed and verified by simulation and experimental investigations. A number voltage transformers typically used in medium voltage grid has been tested in the conducted disturbances...

  • Voltage Harmonics Transfer through Medium Voltage Instrument Transformers

    Publikacja

    Voltage transformers are widely used in power quality monitoring systems in medium and high voltage grids. This paper presents accuracy problems related to voltage harmonics transfer through instrument transformers. A simplified lumped-parameters wideband circuit model of the voltage transformer is proposed and verified by simulation and experimental investigations. A number of voltage transformers have been tested in the frequency...

    Pełny tekst do pobrania w portalu

  • Magnetoelectric, spectroscopic, optical and elastic properties of Co-doped BaTiO3 ceramics

    Publikacja
    • R. Bujakiewicz-Koronska
    • Ł. Gondek
    • L. Vasylechko
    • M. Balanda
    • E. Juszynska-Galazka
    • M. Galazka
    • D. Majda
    • W. Piekarczyk
    • A. Zywczak
    • A. Ciżman... i 11 innych

    - JOURNAL OF ALLOYS AND COMPOUNDS - Rok 2023

    he BaTiO3 perovskite is widely used in the electronic technology due to its dielectric, piezoelectric and ferroelectric properties and is a well-known base for obtaining a promising multifunctional material. In this paper we report the extensive studies on the Co-doped BaTiO3 ceramics for the wide range cobalt content. Full structural characterization of studied samples in a 20–450 K range was provided. The results of research...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Comparative analysis of switched reluctance motor control algorithms

    Publikacja
    • G. Demidova
    • Y. Derbikov
    • F. Petrikov
    • D. Lukichev
    • R. Strzelecki
    • A. Anuchin

    - Scientific and Technical Journal of Information Technologies, Mechanics and Optics - Rok 2023

    Предмет исследования. Развитие микропроцессорной техники и силовой электроники позволило создавать недорогие и эффективные системы управления различными электромеханическими объектами, которые ранее широко не использовались из-за сложности управления. К таким устройствам можно отнести вентильно-индукторные электрические машины. Данные машины широко применяются в различных практических разработках, например, в тяговом электроприводе,...

    Pełny tekst do pobrania w portalu

  • Comparative analysis of switched reluctance motor control algorithms

    Publikacja
    • G. Demidova
    • Y. Derbikov
    • F. Petrikov
    • D. Lukichev
    • R. Strzelecki
    • A. Anuchin

    - Scientific and Technical Journal of Information Technologies, Mechanics and Optics - Rok 2023

    Предмет исследования. Развитие микропроцессорной техники и силовой электроники позволило создавать недорогие и эффективные системы управления различными электромеханическими объектами, которые ранее широко не использовались из-за сложности управления. К таким устройствам можно отнести вентильно-индукторные электрические машины. Данные машины широко применяются в различных практических разработках, например, в тяговом электроприводе,...

    Pełny tekst do pobrania w portalu

  • Problems with microprocessor voltage-to-frequency and frequency-to-voltage converters implementation

    The article presents the problems of digital voltage-to-frequency and frequency-to-voltage processing. Transducer systems implemented in microprocessor technology are presented, the timing of signals and functioning algorithms are discussed. An analysis of processing errors has been performed and the results of experimental studies of realized systems are presented.

    Pełny tekst do pobrania w portalu

  • Improving voltage levels in low-voltage networks with distributed generation – case study

    Publikacja

    - Rok 2018

    The use of distributed generation in low-voltage networks may cause the voltage variation in them, within the wide range. In unfavourable circumstances, the voltage may reach unacceptable values. The paper presents the effect of distributed generation on voltage levels in a selected low-voltage rural distribution network in Poland. An analysis of possible methods for improving voltage levels in this network is conducted. The most...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Voltage variations and their reduction in a rural low-voltage network with PV sources of energy

    Publikacja

    - Electronics - Rok 2021

    Renewable sources of energy (RES), especially photovoltaic (PV) micro-sources, are very popular in many countries. This way of clean power production is applied on a wide scale in Poland as well. The Polish legal regulations and tariffs specify that every prosumer in a low-voltage network may feed this network with a power not higher than the maximum declared consumed power. In power networks with RES, the voltage level changes...

    Pełny tekst do pobrania w portalu

  • Quasi-resonant DC-link voltage inverter with enhanced zero-voltage switching control

    A new topology modification of the parallel quasi-resonant circuit for a dc-link voltage inverter enables regulation of the zero voltage dc-link subperiods and the dc-link voltage gradient settings. The proposed circuit is based on four MOSFET switches with free-wheeling diodes for controlled quasi-resonant recharging between L-C tank in order to assure inverter zero voltage switching (ZVS) conditions. Design optimization of the...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Voltage Dependence of Supercapacitor Capacitance

    Publikacja
    • A. Szewczyk
    • J. Sikula
    • V. Sedlakova
    • J. Majzner
    • P. Sedlak
    • T. Kuparowitz

    - Metrology and Measurement Systems - Rok 2016

    Electronic Double-Layer Capacitors (EDLC), called Supercapacitors (SC), are electronic devices that are capable to store a relatively high amount of energy in a small volume comparing to other types of capacitors. They are composed of an activated carbon layer and electrolyte solution. The charge is stored on electrodes, forming the Helmholtz layer, and in electrolyte. The capacitance of supercapacitor is voltage- dependent. We...

    Pełny tekst do pobrania w portalu

  • CO2 capture using steam ejector condenser under electro hydrodynamic actuator with non-condensable gas and cyclone separator: A numerical study

    Publikacja

    The concept for condensation of steam and CO2 separation in a negative CO2 emission gas power plant involves the utilization of a steam ejector condenser (SEC) for direct-contact condensation of vapor with inert gas (CO2) on a spray of subcooled liquid, integrated with a separator to produce pure CO2. Due to the increasing diffusion resistance and reduced convective heat transfer between the steam and subcooled water phases...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Voltage profiles improvement in a power network with PV energy sources – results of a voltage regulator implementation

    Publikacja
    • A. Szultka
    • S. Szultka
    • S. Czapp
    • R. Karolak
    • M. Andrzejewski
    • J. Kapitaniak
    • M. Kulling
    • J. Bonk

    - ENERGIES - Rok 2022

    The constant increase in the number of photovoltaic (PV) energy sources in distribution networks is the cause of serious voltage problems. The networks built at least a dozen years ago are not provided for the installation of a large number of micro-sources. It happens that the previously properly functioning power networks are not able to provide to consumers power with the required parameters, after installing many PV sources....

    Pełny tekst do pobrania w portalu

  • Tuning of the finesse coefficient of optoelectronic devices

    Publikacja

    - Rok 2022

    Optoelectronic devices attracted considerable attention in many branches of science and technology, which can be attributed to their unique properties. Many of them use optical cavities which parameters can be adopted to specific requirements. This thesis investigates the introduction of diamond structures (nitrogen-doped diamond film, boron-doped diamond film, undoped diamond sheet) to optical cavities to tune their finesse coefficient....

    Pełny tekst do pobrania w portalu

  • Diamond Structures for Tuning of the Finesse Coefficient of Photonic Devices

    Publikacja

    - Materials - Rok 2022

    Finesse coefficient is one of the most important parameters describing the properties of a resonant cavity. In this research, a mathematical investigation of the application of diamond structures in a fiber-optic Fabry–Perot measurement head to assess their impact on the finesse coefficient is proposed. We present modeled transmission functions of cavities utilizing a nitrogen-doped diamond, a boron-doped diamond, nanocrystalline...

    Pełny tekst do pobrania w portalu

  • Extending the Frequency Limit of Microstrip-Coupled CSRR Using Asymmetry

    Publikacja

    - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Rok 2021

    Abstract— This article explains the frequency limitation in designing microstrip circuits based on a complementary split-ring resonator (CSRR) and reports a novel technique for increasing its operating frequency, which makes the CSRR suitable for high-frequency applications. This study helps in synthesizing the dimensions of symmetric CSRR (SCSRR) and asymmetric CSRR (ACSRR) circuits, which shows the applicability of the proposed...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Medium voltage drives - challenges and requirements

    Publikacja

    - Rok 2010

    The design and application of medium voltage (MV) drives are associated with different requirements related to the line side and motor side of the drive. This paper presents a brief review of the existing challenges and requirements for employing medium voltage drives in various industries. Line side, motor side, and converterproblems and requirements are described. The aim of the paper is to review the existing problems to allow...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Static Shunt PE Voltage-Quality Controllers

    Publikacja

    - Rok 2007

    This chapter focuses on power electronics (PE)-based solutions used in distribution networks for reduction of supply-voltage-quality deterioration, from long interruptions to the harmonics. Various PE devices and their combinations are addressed for particular or a range of voltage disturbances. A particular solution is applied taking into account demands for voltage quality and network configuration. In general, there are three...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Supercapacitors - charge redistribution and restoring voltage

    Publikacja

    - Rok 2014

    The charge in supercapacitor is stored on electrodes and in electrolyte. The charges on electrodes create the Helmholtz double layer which is formed immediately with time constant of the order of seconds, while the charge storage in electrolyte is going on with time constant of the order of hundreds seconds. When the charged supercapacitor is shorted for few seconds, the charge from electrodes is discharged while the charge in...

  • Estimation of the uncertainty of the AC/AC transducer output voltage

    The paper presents a methodology for estimating uncertainty of voltage transducers processing function, on the example of CYVS411D07 voltage transducers. The analysis was conducted using the method based on the GUM Guide propagation of uncertainty law and the determination of the coverage factor based on the effective number of degrees of freedom (t-Student distribution). The paper also presents example evaluation results of measured...

    Pełny tekst do pobrania w portalu

  • CM Voltage Compensators for Power Electronic Interfaces

    Publikacja
    • R. Smoleński
    • J. Bojarski
    • P. Leżyński
    • A. Kempski
    • J. Łuszcz

    - IEEE Electromagnetic Compatibility Magazine - Rok 2015

    The experimental results presented in the paper have shown that the application of the PEIs might cause EMC related problems, especially in the case of the application of a group of connected converters. The most convenient way to reduce EMI currents and prevent aggregation of EMI currents introduced by a group of converters is through passive compensation of voltage interference sources inside of the single converters. In the...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Multipulse inverter structures with low voltage distortion

    Publikacja

    - Rok 2016

    A novel approach to the voltage source inverters (VSI) construction is presented in the paper. The invented inverter structures allow to operate several DC/AC converters in parallel resulting in lower voltage distortions at extremely low switching frequency. The research presented in the paper describes such a parallel operation of the VSI’s which is possible thanks to the use of coupled inductors. The eighteen-pulse three-level...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Impact of the inclination angle of the condenser with refrigerant R410A on heat transfer coefficient – experimental study

    Publikacja
    • H. Charun
    • M. Czapp
    • S. Czapp
    • M. Orłowska

    - Rok 2016

    In the paper the authors present results of a laboratory test of the condenser with refrigerant R410A. The effect of the inclination of this condenser on the heat transfer coefficient value has been considered. The test has proved that there is an optimal inclination angle of the condenser which gives maximal value of this coefficient.

  • Control strategies and comparison of the Dynamic Voltage Restorer

    Publikacja

    - Rok 2008

    This paper focuses on a selection problems of mitigation of the voltage disturbance by of the Dynamic Voltage Restorers (DVR’s). In short form presented and discussed are the basis of different control strategies of the DVR. The main emphasis is placed on application of modern power electronic devices. Authors of this paper in particular occupy oneself with analysis of the power rating of the typically DVR topologies. These problems...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • AC Motor Voltage and Audible Noise Dataset

    Publikacja

    - Rok 2022

    The dataset titled AC motor voltage and audible noise waveforms in ship’s electrical drive systems with frequency converters contains the voltage and sound measurement results recorded in a marine frequency controlled AC drive system. The dataset is part of research focussing on the impact of the ship’s electrical drive systems with frequency converters on vibrations and the level of audible noise on ships. The dataset allows the...

    Pełny tekst do pobrania w portalu

  • Effect of the inclination angle of the condenser on the heat transfer coefficient value – experimental study

    Publikacja
    • H. Charun
    • M. Czapp
    • S. Czapp
    • M. Orłowska

    - Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika - Rok 2016

    When considering problem of the condensation of the refrigerant in a flow inside channel, one needs to pay attention to the shape of its cross-section, the hydraulic diameter, the channel length as well as the orientation of the channel axis in space (horizontal, vertical, inclined). This paper presents an experimental study concerning the effect of the inclination angle of the condenser with a single coil pipe on the heat transfer...

    Pełny tekst do pobrania w portalu

  • Static Series and Shunt-series PE Voltage-quality Controllers

    Publikacja

    - Rok 2007

    As presented in the Chap. 7 static shunt power electronics (PE) voltage-quality controllers protect the utility electrical system from the unfavorable impact of customer loads. Shunt controllers, as shown in Chap. 6, are recommended mainly for mitigation of the causes of disturbances, and not their effects in distanced nodes of a power-electronics system. In the case when reduction of disturbances effects is required, which leads...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • An influence of the ship's block coefficient implementation on the evaluation of it's hull girder bending

    Publikacja
    • A. Pająk

    - Rok 2012

    An influence of the three different ways of implementation ship's block coefficient δ (three geometrical models) on the stresses due to wave bending moment have been investigated. Two models have been applied and compared: beam one (description of the shape usingparameters) and FEM shell model (direct representation of the shape). The outcomes have been compared to Polish Register of Shipping (PRS) rules. The results show that...

  • The Impact of Micro-Sources on Voltage Distortions in a Power Grid

    Publikacja

    The increase in the number of photovoltaic (PV) systems integrated with low voltage (LV) grids has led to a great need to analyse the impact of these systems on the quality of electricity and the reliability of its supply. This paper presents and compares the energy quality requirements imposed by various countries on photovoltaic plants. Then, based on real object tests and simulation in DIgSILENT PowerFactory, the impact has...

    Pełny tekst do pobrania w portalu

  • Voltage control in a power system with renewable sources of energy

    Publikacja

    - Rok 2019

    Intensive development of distributed generation in power systems, caused by the European Union energy policy, gives possibility for improving safety in power delivery as well as optimizing the costs of the systems functioning. In this context, distributed generation can be used for voltage control in power systems – it can be performed by the control of reactive power of each source of energy or a group of energy sources. This...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Fractional-order Systems and Synchronous Generator Voltage Regulator

    Publikacja

    - Acta Energetica - Rok 2015

    Modern regulators of synchronous generators, including voltage regulators, are digital systems, in their vast majority with standard structures contained in the IEEE standard. These are systems described with stationary differential equations of integral order. Differential equations of fractional order are not employed in regulators for synchronous generator control. This paper presents an analysis of the possibilities of using...

    Pełny tekst do pobrania w portalu

  • Methods of determination of C coefficient for period of rolling vessel in calm water for example of pax cargo ship

    This article presents a different approach to calculate the C coefficient needed to determine the period of own rolling vessel in calm water. The C coefficient is usually adopted as the approximate value from the available literature, usually depending on the type of vessel, and less dependent on the loading condition. In experimental studies of marine properties (seakeeping) often have a problem with the selection of the correct...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Magnetoelectric Vortex Magnetic Field Sensors Based on the Metglas/PZT Laminates

    Publikacja
    • D. Huong
    • H. Tam
    • V. Ngoc
    • N. Vinh
    • P. Anh
    • N. Van
    • N. Thi
    • N. Duc

    - SENSORS - Rok 2020

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Distance magnetic nanoparticle detection using a magnetoelectric sensor for clinical interventions

    Publikacja
    • D. Huong
    • D. Dang
    • N. Toan
    • N. Tuan
    • A. Phung
    • N. Duc

    - REVIEW OF SCIENTIFIC INSTRUMENTS - Rok 2017

    Pełny tekst do pobrania w serwisie zewnętrznym

  • DC-link voltage balancing in cascaded H-Bridge converters

    In the paper a DC-link voltage balancing strategy for multilevel Cascaded H-Bridge (CHB) converter is proposed. Presented solution bases on optimal choice of active vector durations in Space-Vector Pulse Width Modulation (SV-PWM). It makes it possible to DC-link voltages control and to properly generate the output voltage vector in the case of DC-link voltage unbalance. Results of simulation and experimental researches...

    Pełny tekst do pobrania w portalu

  • Experimental study and comparison with predictive methods for flow boiling heat transfer coefficient of HFE7000

    This article describes an experimental study of flow boiling of HFE7000 inside a smooth vertical channel. The investigation has been carried out in a circular stainless-steel tube with an inner diameter of 2.3 mm. The data have been collected for the applied heat fluxes q ranging from 61 to 205 kW/m2, the mass flux G ranging from 214 to 1006 kg/(m2 s), the saturation temperature Tsat ranging from 30 to 54 °C and the full range...

    Pełny tekst do pobrania w portalu

  • Classification of high-voltage varistors into groups of differentiated quality

    The research was aimed on defining a factor of quality for high-voltage varistors using Non-Destructive Testing (NDT) techniques, which could be applied during the production testing. The newly proposed parameter Q determined on the basis of the lowest resonant frequency fr measured within the preselected frequency range was taken into account. The parameter Q was defined for ZnO structures after firing, without metallized contacts....

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Low harmonic multipulse voltage converters using coupled reactors

    Publikacja

    - Rok 2016

    This paper presents a novel approach to the multi pulse voltage converters (VC), especially voltage source inverters (VSI) and matrix converters (MC) based on several typical identical modules connected in parallel using coupled reactors. Such arrangements resulting in lower voltage distortions at extremely low switching frequency. The proposed arrangement was validated by simulation. Laboratory models of 18- and 24pulse 3-level...

    Pełny tekst do pobrania w serwisie zewnętrznym

  • Synchronized six-step voltage generation in high-speed PMSM drive

    Publikacja

    Synchronized voltage generation has already been considered in the context of pulse width modulation (PWM). References prove that synchronized PWM substantially decreases subharmonics in inverter output voltage when operating with low switching-to-fundamental frequency ratio. This paper identifies problems of unsynchronized voltage generation in electric drives under six-step inverter operation. Guidelines for the synchronization...

    Pełny tekst do pobrania w portalu