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Wyświetlanie 1-15 z 89
Tytuł:
Novel arrangement of combined star-delta stator winding aimed at reduction of copper usage in electric machine
Nowy układ uzwojenia mieszanego gwiazda-trójkąt w stojanie zmniejszający zużycie miedzi w maszynie elektrycznej
Autorzy:
Schreier, L.
Bendl, J.
Chomat, M.
Powiązania:
https://bibliotekanauki.pl/articles/1197468.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
electric machine
stator
three-phase winding
Opis:
The submitted paper deals with the increased energy efficiency of induction machines by means of the so-called combined stator winding. Two basic variants of this winding, the series and parallel ones, are shown. The suppression of higher harmonics is analysed by means of the method of space vectors and symmetrical components. It is shown that the so-called series variant of the combined winding has a better ability to suppress higher spatial harmonics. The commonly used combined winding has, however, a longer pitch and thus bigger stator resistance and greater consumption of copper. The paper presents a proposal of an adapted combined winding whose pitch is smaller than that of the used three-phase winding. This fact results in decreasing the consumption of copper conductors with preserving the energy efficiency. The results of the analysis have been verified by measurements on physical models of machines with the combined and the adapted combined windings.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2018, 3, 119; 117-122
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three phase partitioning as a rapid and efficient method for purification of plant-esterase from wheat flour
Autorzy:
Dong, Liang
He, Linxin
Huo, Danqun
Powiązania:
https://bibliotekanauki.pl/articles/778983.pdf
Data publikacji:
2020
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Purification
Plant esterase
Three phase partitioning
Opis:
Three-phase partitioning (TPP) was used to purify plant-esterase from wheat flour. Effect of various process parameters has been evaluated and plant-esterase was purified to 11.35-fold by optimized single step TPP system (50%, (w/v) (NH4)2 SO4 saturation, 1:1 (v/v) ratio of crude extract: t-butanol at pH 4).The enzyme was found to be exclusively partitioned in the aqueous phase. Using TPP system, plant-esterase quickly purified to homogeneity with very high purity and activity. On the basis of single factor research, purification process was optimized by using response surface method, established a new type of high effcient purification plant-esterase method. To the best of our knowledge, this is the first report for purification and characterization of plant-esterase by using three phase partitioning (TPP). The results indicated that, TPP is a simple, quick, economical and very attractive process for purification of plant-esterase compared to conventional chromatographic protocols.
Źródło:
Polish Journal of Chemical Technology; 2020, 22, 2; 42-49
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Error analysis of the three-phase electrical energy calculation method in the case of voltage-loss failure
Autorzy:
Cheng, Han-miao
Wang, Zhong-dong
Cai, Qi-xin
Lu, Xiao-quan
Gao, Yu-xiang
Song, Rui-peng
Tian, Zheng-qi
Mu, Xiao-xing
Powiązania:
https://bibliotekanauki.pl/articles/221096.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
three-phase electrical energy meter
voltage-loss failure
voltage substitution
three-phase voltage unbalance
calculation error
Opis:
The single-phase voltage loss is a common fault. Once the voltage-loss failure occurs, the amount of electrical energy will not be measured, but it is to be calculated so as to protect the interest of the power supplier. Two automatic calculation methods, the power substitution and the voltage substitution, are introduced in this paper. Considering the lack of quantitative analysis of the calculation error of the voltage substitution method, the grid traversal method and MATLAB tool are applied to solve the problem. The theoretical analysis indicates that the calculation error is closely related to the voltage unbalance factor and the power factor, and the maximum calculation error is about 6% when the power system operates normally. To verify the theoretical analysis, two three-phase electrical energy metering devices have been developed, and verification tests have been carried out in both the lab and field conditions. The lab testing results are consistent with the theoretical ones, and the field testing results show that the calculation errors are generally below 0.2%, that is correct in most cases.
Źródło:
Metrology and Measurement Systems; 2019, 26, 3; 505-516
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Execution of New Interleaved Single-Stage of Three-Phase Ac-Dc Converter with Power Factor Correction Using Space Shift Pulse Width Modulation
Autorzy:
Sowntharya, S.
Sureshkumar, R.
Powiązania:
https://bibliotekanauki.pl/articles/1192665.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
AC-DC converter
power factor correction
space vector phase-shifted modulation
three-phase converter
three-phase system
transformer circuit
Opis:
In this project is addressed to the function of AC-DC converter operation and its modulation techniques. In recent years to developing pulse width modulation to used power conversion process. The many techniques of PWM to improve power production program. In this project focused Addresses a cost-effective, flexible solution of improvement of efficiency to three phase AC-DC converter using SVPWM(space vector pulse width modulation).The proposed converter has a better efficiency, especially under light-load condition and it was explained that this is because the energy from the output inductor can always be used to ensure that the very top and the very bottom switches can be turned ON with ZVS due to a discharge path that is introduced by its flying capacitor.
Źródło:
World Scientific News; 2016, 47, 2; 176-189
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikrofiltracja z podawaniem nadawy płynącej wraz z pęcherzykami powietrza
Microfiltration with the feed containing air bubbles
Autorzy:
Szwast, M.
Szwast, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2073048.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikrofiltracja
nadawa trójfazowa
microfiltration
three-phase feed
Opis:
Zbadano krzyżowy układ mikrofiltracyjny do zagęszczania zawiesin rozdrobnionego ciała stałego w cieczy zasilany nadawą płynącą wraz z pęcherzykami powietrza. Nie stwierdzono wpływu pęcherzyków na przebieg procesu, co oznacza, że pozytywne oddziaływanie pęcherzyków przejawiające się w zmywaniu osadu i negatywne przejawiające się w blokowaniu przez pęcherzyki dostępu cieczy do części powierzchni membrany, wzajemnie znoszą się. Wykazano też, że literaturowa zależność strumienia permeatu od stężenia zawiesiny dla nadawy dwufazowej jest aktualna także dla nadawy trójfazowej.
Cross-flow microfiltration used for concentrating solid particles suspension with the addition of gas bubbles in the feed was investigated. The impact of gas bubbles on microfiltration process was not observed. This means that the positive impact of gas bubbles manifested in deposit washing from the membrane surface and the negative impact exhibited by blocking the liquid access to the membrane surface, cancel each other. It was proven that the literature relationship between permeate flow and suspension concentration for the two-phase feed is valid also for the three-phase feed.
Źródło:
Inżynieria i Aparatura Chemiczna; 2016, 2; 80--81
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-phase contact line expansion during air bubble attachment to hydrophobic solid surface – experiment and modeling
Autorzy:
Basarova, P.
Soušková, K.
Zawala, J.
Powiązania:
https://bibliotekanauki.pl/articles/110269.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Attachment
simulations
bubble
three-phase contact
dewetting
Opis:
Kinetics of spreading of the three-phase contact hole (dewetting) formed by an air bubble colliding with hydrophobic solid surface, after rupture of intervening liquid film, was studied both experimentally and numerically. During experiments it was found that evolution of the TPC line diameter with time occurs with characteristic S-shaped trend which, in consequence, causing rather unexpected maxima at the TPC line spreading velocity curves. It was determined that position of this maximum appears after 1-2 ms after TPC hole formation and its position (in respect to time) depends on the bubble diameter. In solution of surface-active substance this maximum was much smoother and longer. By means of complementary numerical calculations the source of maxima existence and differences in their position and shapes were explained. It was concluded that this effect has only hydrodynamic origin, caused by different course of bubble shape pulsations during TPC line formation and spreading, which depends on degree of liquid/gas interface immobilization (fluidity retardation).
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1095-1106
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved modeling of new three-phase high voltage transformer with magnetic shunts
Autorzy:
Chraygane, M.
El Ghazal, N.
Fadel, M.
Bahani, B.
Belhaiba, A.
Ferfra, M.
Bassoui, M.
Powiązania:
https://bibliotekanauki.pl/articles/950652.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transformer
three-phase
modeling
EMTP
microwaves
power supply
Opis:
This original paper deals with a new approach for the study of behavior in nonlinear regime of a new three-phase high voltage power supply for magnetrons, used for the microwave generators in industrial applications. The design of this system is composed of a new three-phase leakage flux transformer supplying by phase a cell, composed of a capacitor and a diode, which multiplies the voltage and stabilizes the current. Each cell. in turn, supplies a single magnetron. An equivalent model of this transformer is developed taking into account the saturation phenomenon and the stabilization process of each magnetron. Each inductance of the model is characterized by a non linear relation between flux and current. This model was tested by EMTP software near the nominal state. The theoretical results were compared to experimental measurements with a good agreement. Relative to the current device, the new systemprovides gains of size, volume, cost of implementation and maintenance which make it more economical.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 157-172
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic states of three-phase induction motors. Selected problems
Autorzy:
Nawrowski, R.
Stein, Z.
Zielinska, M J
Powiązania:
https://bibliotekanauki.pl/articles/97485.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
induction motor
dynamic states
three-phase induction motor
Opis:
The paper presents some problems arising during dynamic processes undergoing in three-phase induction motors, particularly in some asymmetric connection modes. Some characteristics illustrating the machine behaviour, particularly during start-up and at asymmetric connection modes, are presented with the use of basic differential equations describing operation of three-phase induction motors.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 158-164
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A predictive estimation based control strategy for a quasi-resonant dc-link inverter
Autorzy:
Turzyński, M.
Banach, P.
Murawski, P.
Pepliński, R.
Chrzan, P. J.
Powiązania:
https://bibliotekanauki.pl/articles/200484.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resonant converters
ZVS three-phase inverter
current estimation
Opis:
Control of parallel quasi resonant dc link inverters (PQRDCLI) is usually based on dc link input inverter current. Instead of a direct measurement of this noise sensitive and fast changing current signal - its estimation with one step prediction may be considered. Estimation of an input inverter current is based on inverter output current measurements, applied in most of power electronics controlled ac drives. In this paper, the PQRDCLI fed induction motor (IM) with a predictive current estimation stabilizes resonant inverter output voltage slopes du/dt independently of load. By control of output voltage derivatives, reduction of overvoltage spikes and common mode motor currents is achieved. An analysis of the PQRDCLI control with a predictive current estimation strategy is verified by the Saber system simulation and experimental tests in a laboratory setup.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 4; 757-762
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trójfazowy generator z magnesami trwałymi w reżimie pracy jednofazowej
Tree phase permanent magnet generator assigned to single-phase work
Autorzy:
Rossa, R.
Pistelok, P.
Powiązania:
https://bibliotekanauki.pl/articles/1369584.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
trójfazowy generator
praca jednofazowa
three phase permanent
single-phase work
Opis:
The article presents the concept of an electromagnetic circuit generator with permanent magnets mounted on the surface rotor core designed for single phase work. Computation field-circuit model was shown. The spectrum of time course of voltages in the idle work was presented. The cross section with graphically presentation of magnetic induction in particular parts of electromagnetic circuits was presented. Distribution of magnetic induction at the rated load point for each phase were shown. The time course of voltages and currents for each phases for rated power were displayed. An analysis of laboratory results and measurement of load characteristics of the generator was discussed. The work deals with three electromagnetic circuits of generators with permanent magnet where output voltage characteristics versus rated power were expressed.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 2, 95; 71-76
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimalizacja strat mocy w trójfazowym synchronicznym silniku reluktancyjnym
Power loss minimization in a three-phase synchronous reluctance motor
Autorzy:
Banach, H.
Powiązania:
https://bibliotekanauki.pl/articles/1368759.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
straty mocy
trójfazowy silnik
power loss
three-phase motor
Opis:
The three-phase reluctance motor has been investigated of rated power PN = 1,8 kW and nN = 1500 rpm. The motor was tested for the five selected frequencies fS = 50, 40, 30, 20, 10 Hz. The load test was made for supplying with a rated voltage and with an optimal voltage. It was found that at optima operation of the motor, its efficiency can be significantly improved , in particular at part load. The optima power factor has constant value cos = 0,5 and is independent from load and frequencies of the supply voltage.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 1, 94; 105-109
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Falownik napięciowy oparty na potrójnym mostku H do zasilania silnika trójfazowego z przerwaną fazą
Three phase motor with open phase supplied from voltage inverter based on triple h bridge
Autorzy:
Radecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/1369107.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
falownik napięcia
silnik trójfazowy
three-phase motor
voltage inverter
Opis:
In this paper, a voltage inverter based on three independent H-bridges to supply health and faulty motor was presented. Operating conditions of this type of inverter were presented for each open phase. For proposed control scheme that refers to independent control of each phase current, a robust properties of control system was shown. Based on computer simulations and laboratory tests, the effectiveness of squirrel cage induction motor control, supplied from three independent H-bridges was shown in case of dynamic phase opening.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 1, 94; 115-120
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collision–attachment law of lepidolite, feldspar and quartz with bubbles in the combined cationic and anionic collector system
Autorzy:
Liu, Ziyu
Jiao, Fen
Qin, Wenqing
Wei, Qian
Powiązania:
https://bibliotekanauki.pl/articles/2175442.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
combined collector
collision probability
attachment probability
three-phase contact line
Opis:
The purpose of this study is to explore the collision–attachment law of lepidolite, feldspar and quartz during their interaction with bubbles by particle settlement method and bubble rising method under the action of combined collector. In this study, HQ-330 and dodecylamine were used as combined collector to separate lepidolite, feldspar and quartz by flotation. It also aims to analyse the relationship between collision probability, attachment probability, formation time of three-phase contact line and flotation recovery and the main factors affecting the formation time of three-phase contact line. Experimental results show that when the pH is 7 and the combined collector dosage is 100 mg/L, the separation of lepidolite from feldspar and quartz can be achieved. In the particle settlement experiments, the correlation between collision probability and flotation recovery is low, the correlation between attachment probability and flotation recovery is positive. In the bubble rising experiments, the formation time of three-phase contact line (tTPC) is negatively correlated with flotation recovery, and the combined collector changes tTPC by changing drainage time.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155324
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the external proximity effect on the power losses in flat three phase high current busduct
Autorzy:
Piątek, Z.
Szczegielniak, T.
Kusiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97507.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
active power
reactive power
Bessel function
three phase current busduct
Opis:
In the paper the influence of the external proximity effect on the active and reactive power in flat three phase high current busduct were presented. Calculations were made using the Poynting theorem and Joule-Lenz law.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 34-44
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detailed experimental study of bubble adhesion on hydrophobic surface
Autorzy:
Basařová, P.
Soušková, K.
Powiązania:
https://bibliotekanauki.pl/articles/110920.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bubble-particle interaction
bubble adhesion
three-phase contact line
surfactant
Opis:
This work is focused on the detailed experimental study of bubble adhesion on a hydrophobic solid surface. The frame rate 16000 fps was used in side view arrangement in order to capture in detail the three-phase contact line expansion and bubble shape changes. Experiments were done in pure water and in solutions of the anionic surfactant sodium dodecyl sulphate in low, medium and high concentrations. It was found out that the rupture of a liquid film is not symmetrical with respect to the vertical axis of the bubble symmetry. This asymmetry of TPC line formation leads to bubble surface oscillations and asymmetry in dynamic contact angles. These dynamic mechanisms are diminished with increasing surfactant concentration. The non-linearity of expansion velocity was also observed. In the case of high bubble surface mobility, the expansion velocity first decreases and after few milliseconds, the second velocity maximum emerges caused by kinetic energy dissipation. In surfactant solutions, the arising Marangoni stresses should be taken into account because the expansion velocity increases in the first moments of TPC line expansion. Existing models, such as hydrodynamic and molecular-kinetic, are not able to incorporate with bubble oscillations in pure liquids as well as the non-monotonic curve of expansion velocity profile in surfactant solutions.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 1; 111-123
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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