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Wyświetlanie 16-30 z 122
Tytuł:
Problem rozmagnesowania magnesów z ziem rzadkich w silniku PMSM z uzwojeniem ułamkowo-żłobkowym
Problem of demagnetization of rare earths magnets in pmsm motors with fractional slot winding
Autorzy:
Herbst, A.
Powiązania:
https://bibliotekanauki.pl/articles/1367520.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
PMSM
magnesy
odmagnesowanie
uzwojenie ułamkowo-żłobkowe
fractional slot winding
Opis:
Articles takes into consideration problem of demagnetization of rare earths magnets in PMSM with buried magnets. First part describes design and operation aspects of this type of machine with power around 1 kW and speed of 1500-3000 RPM. Second part shows electromagnetical calculations done with help of finite element. Especially overload and out-of-synchronism cases were investigated. Last part shows results of measurements of real machine and compares with calculations.
W artykule przedstawiono zagadnienie rozmagnesowania magnesόw z ziem rzadkich w silniku PMSM z magnesami zagłebionymi. Wstęp artykułu opisuje po krótce zagadnienia projektowe i eksploatacyjne dotyczące tego typu maszyn w zakresie mocy około 1 kW i prędkości 1500-3000 obr/min. Druga część artykułu pokazuje obliczenia magnetyczne wykonane metodą elementow skończonych w.w. maszyny, ze szczególnym naciskiem na pracę przy przeciążeniu oraz wypadnięciu z synchronizmu. Ostatnia część pokazuje wyniki badań rzeczywistych oraz porównuje je z wynikami obliczeń.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2015, 4, 108; 77-81
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer modeling in the diagnostics of transformers’ windings deformations
Autorzy:
Banaszak, S.
Gawrylczyk, K. M.
Powiązania:
https://bibliotekanauki.pl/articles/97341.pdf
Data publikacji:
2010
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
transformer
computer model
winding of the transformer
frequency response
Opis:
The diagnostics of power transformers is very important in order to plan repairs and replacements of aged population of transformers operated in Poland and Europe. One of these methods is Frequency Response Analysis - FRA. It can detect any mechanical changes in active part of transformer, which may even lead to serious faults of units in service. As the method is based on comparison of measured curves, which are not always available from previous measurements the computer modeling was applied to create models of windings’ response. The paper presents examples of models created for simple windings and also for real transformer with some deformations of windings simulated.
Źródło:
Computer Applications in Electrical Engineering; 2010, 8; 132-140
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of winding topologies on the performance of flux-switching permanent magnet machine having different number of rotor poles
Autorzy:
Chijioke Awah, Ch.
Inya Okoro, O.
Powiązania:
https://bibliotekanauki.pl/articles/140434.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
average torque
copper loss
phase back-EMF
winding topologies
Opis:
Comparison of the electromagnetic performance of a flux-switching permanent magnet (PM) machine having two separate stators as well as different winding topologies is investigated in this paper. Different stator and rotor pole combinations of these machines are also considered. The analysis includes the open-circuit and on-load characteristics of the analyzed machines. It is observed that, the largest fundamental values of electromagnetic torque, for each winding topology, is seen in the 11-rotor-pole and 10-rotor-pole machines having alternate- and all-pole-wound configurations, respectively. Moreover, significant ripple is observed in the waveforms of the even-number rotor pole machines compared to their corresponding odd-number rotor pole counterparts. Overall, the alternate-pole-wound machines essentially have larger torque-density than their equivalent all-pole-wound ones. The investigated machine is also tested for validation.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 845-855
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical experimental equipment for making porous wire samples
Autorzy:
Jakubowski, A.
Dounar, S.
Powiązania:
https://bibliotekanauki.pl/articles/27315847.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
wire
mandrel
winding
radial reduction
fixing of the ends
Opis:
Original experimental technical equipment for making samples in the form of permeable tubes of porous material, i.e. coiled wire. The article describes the construction of the equipment, the processes of forming and pressing the wire semi-product and methods of fixing the ends of the wire product.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 669-674
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Torque ripple reduction in BLDC motor based ona PWM technique for open-end winding
Autorzy:
Baszyński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/1841368.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
BLDC motor
open-end winding
PWM technique
unipolar modulation
Opis:
The article presents a modulation method for BLDC motors with unconnected windings. This method uses two full bridges (or three 12-switch H-bridges). The useof the described modulation enables reducing the motor current variable and increasing (fourfold in relation to the switching frequency) the motor current ripple frequency. Themost important benefit of using a 12-switch inverter is the twofold reduction of the dc-linkvoltage while maintaining the rated rpm (voltage reduction in comparison to a typical supplymethod). A voltage reduction causes a reduction in losses on semi-conductor elements. Thearticle also demonstrates that the proposed modulation technique significantly shortens thetime of current commutation between windings.
Źródło:
Archives of Electrical Engineering; 2021, 70, 1; 5-23
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low voltage winding insulation systems under the influence of high du/dt slew rate inverter voltage
Autorzy:
Pauli, Florian
Ruf, Andreas
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/140993.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
life time
partial discharge
SiC semiconductors
winding insulation system
Opis:
Variable speed and low voltage electrical drives are commonly operated by frequency converters. According to recent developments, there is a trend in the area of semi-conductors, that switching frequency and voltage slew rate will increase significantly. The aim of these semiconductors is to reduce the switching losses and to increase the switching frequency, which enables to reduce the size of passive components in the powerelectric circuit. This results in less material effort and lower cost, for the power electronic component. However, electric motors operated by high slew rate inverters show problems in the winding insulation, which have to be analyzed. Such problems are well known for high voltage machines. Due to the increasing slew rate, this problematic occurs in low voltage machines nowadays as well. Here, the influence of fast switching semiconductors on the winding insulation system is studied, using accelerated ageing tests with fast switching high-voltage generators.
Źródło:
Archives of Electrical Engineering; 2020, 69, 1; 187-202
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced Reliability for Winding Machine via New Fault Tolerant Control Based on RST-Backstepping Controller
Autorzy:
Haouari, Fouad
Messekher, Salaheddine
Bali, Noureddine
Tadjine, Mohamed
Boucherit, Mohamed Seghir
Powiązania:
https://bibliotekanauki.pl/articles/1955988.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
winding machine
fault tolerant control
backstepping control
RST control
Opis:
Due to the external disturbances, model uncertainties, strong coupling, and occurred faults, the winding machine presents a great control challenge. In order to deal with these problems, this paper presents the formulation of a novel scheme of fault tolerant control (FTC) for three-motor web-winding systems; it is concerned with the nonlinear robust backstepping control based on the combination of RST and backstepping controllers where the process is modelled by a nonlinear model. The main contribution of the paper is that the approach developed here summarises the performance of RST and backstepping controllers in order to design a robust controller capable of eliminating external disturbances and sensor faults affecting the system. The stability of the whole system is proven using the Lyapunov theory. Finally, analysis in comparison with the conventional backstepping controller and simulations in the MATLAB environment are accomplished to confirm the efficiency of the proposed method.
Źródło:
Power Electronics and Drives; 2021, 6, 41; 229-241
2451-0262
2543-4292
Pojawia się w:
Power Electronics and Drives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-energy transformer’s safety
Monitorowanie temperatury transformatora wysokoenergetycznego z wykorzystaniem czujnika światłowodowego
Autorzy:
Kulig, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1203880.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
transformator mocy
uszkodzenie uzwojenia
blackout
power transformer
winding failure
Opis:
Based on many advantages of fiber optic sensor technology, the article presents the possibility of measuring temperature in difficult environmental conditions, for example in a high electromagnetic field. Fabry-Perot interferometers with a short resonant cavity of low resolution are used in these fiber-optic sensors. The advantages of such a solution include simple and compact construction, low price, low temperature effect and no interference loss due to polarization. Due to the potential of transformer loads, electrical power plants and operating companies test power transformers to assess their condition, set a schedule for maintenance work and plan replacement. Oil temperature measurement is most commonly used using typical sensors. However, this measurement does not reflect the temperature of the winding during the sudden increase in the transformer load. The proposed method of verifying the parameter, which is the winding temperature, can be very attractive for electricity distributors.
Bazując na wielu zaletach technologii czujników światłowodowych, artykuł przedstawia możliwość pomiaru temperatury w trudnych warunkach środowiskowych, na przykład w wysokim polu elektromagnetycznym. W omawianych czujnikach światłowodowych stosuje się interferometry Fabry-Perota, z krótką wnęką rezonansową o małej rozdzielczości. Walorami takiego rozwiązania są m.in. prosta i zwarta budowa, niska cena, mały wpływ temperatury oraz brak zaniku obrazu interferencyjnego wywołanego polaryzacją. W związku z możliwością obciążeń transformatorów, zakłady elektroenergetyczne oraz firmy prowadzące eksploatację testują transformatory mocy w celu oceny ich stanu, ustalenia harmonogramu prac konserwacyjnych i zaplanowania wymiany. Najczęściej stosowany jest pomiar temperatury.
Źródło:
Physics for Economy; 2019, 3, 1; 5-13
2544-7742
2544-7750
Pojawia się w:
Physics for Economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field-circuit analysis of AC machine taking into account stator winding asymmetry
Autorzy:
Pietrowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1813709.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
winding asymmetry
induction machine
axial flux
field-circuit model
Opis:
The paper presents the influence of an asymmetry of a stator winding on an axial flux in AC machine. The objective research was performed for selected values of asymmetry. The axial flux was calculated as the sum of flux linkage with stator winding. In order to achieve a magnetic field distribution a dedicated 2D finite element model of AC machine was elaborated. The waveforms of axial flux and torque-time characteristic have been shown. It can be concluded that the asymmetry has significant impact on the axial flux and the pulsation of torque.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 386-392
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of multiphase synchronous machines with fractional slot concentrated windings
Autorzy:
Szeląg, W.
Jędryczka, C.
Powiązania:
https://bibliotekanauki.pl/articles/97197.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Permanent magnet synchronous machines
multiphase machines
fractional slot concentrated winding
Opis:
The paper deals with analyses of multiphase fractional slot permanent magnet synchronous machines with concentrated windings. The advantages of studied machines have been discussed. Studied in the paper multiphase machines contain the number of phases in multiple of 3, facilitating the application of commonly used 3–phase intelligent power modules to build the multiphase supply system. The coding convention, an algorithm and software for synthesis and analysis of multiphase fractional slot concentrated windings have been developed. To verify presented algorithm the field approach has been employed. The professional FEM package Maxwell has been used to determine functional parameters of the test machine with different types of windings. Selected results of simulations of studied multiphase machines with different phase number and winding layouts have been presented and analyzed.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 231-244
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Asynchronous slip-ring motor synchronized with permanent magnets
Autorzy:
Glinka, T.
Bernatt, J.
Powiązania:
https://bibliotekanauki.pl/articles/140518.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
motor with permanent magnets
slip-ring rotor winding
asynchronous start
Opis:
The electric LSPMSM motor presented in the paper differs from standard induction motor by rotor design. The insulated start-up winding is located in slots along the rotor circumference. The winding ends are connected to the slip-rings. The rotor core contains permanent magnets. The electromechanical characteristics for synchronous operation were calculated, as were the start-up characteristics for operation with a shortcircuited rotor winding. Two model motors were used for the calculations, the V-shaped Permanent Magnet (VPM) – Fig. 3, and the Linear Permanent Magnet (IPM) – Fig. 4, both rated at 14.5 kW. The advantages of the investigated motor are demonstrated in the conclusions.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 199-206
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of end-winding proximity losses in a high-speed PM machine
Autorzy:
Mlot, A.
Lukaniszyn, M.
Korkosz, M.
Powiązania:
https://bibliotekanauki.pl/articles/141443.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
end-winding
permanent magnet motor
eddy-currents losses
proximity losses
Opis:
This paper presents a finite element investigation into the proximity losses in a high-speed permanent magnet (PM) machine for traction applications. A three-dimensional (3D) finite element analysis (FEA) is employed to evaluate and identify the endwinding contribution into the overall winding power loss generated. The study is focused on the end-winding effects that have not been widely reported in the literature. The calculated results confirm that the end-winding copper loss can significantly affect the eddycurrent loss within copper and it should be taken into account to provide reasonable prediction of total losses. Several structures of the end-winding are analyzed and compared in respect to the loss and AC resistance. The results clearly demonstrate that the size of the end-winding has a significant impact on the power loss. The calculated results are validated experimentally on the high-speed permanent magnet synchronous machine (PMSM) prototype for selected various winding arrangements.
Źródło:
Archives of Electrical Engineering; 2016, 65, 2; 249-261
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic and steady state performance comparison of line-start permanent magnet synchronous motors with interior and surface rotor magnets
Autorzy:
Ogbuka, C.
Nwosu, C.
Agu, M.
Powiązania:
https://bibliotekanauki.pl/articles/141537.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PMSM
line-start
damper winding
airgap torque
reluctance torque
saliency
Opis:
A comprehensive comparison of the dynamic and steady state performance characteristics of permanent magnet synchronous motors (PMSM) with interior and surface rotor magnets for line-start operation is presented. The dynamic model equations of the PMSM, with damper windings, are utilized for dynamic studies. Two typical loading scenarios are examined: step and ramp loading. The interior permanent magnet synchronous motor (IPMSM) showed superior asynchronous performance under no load, attaining faster synchronism compared to the surface permanent magnet synchronous motor (SPMSM). With step load of 10 Nm at 2 s the combined effect of the excitation and the reluctance torque forced the IPMSM to pull into synchronism faster than the SPMSM which lacks saliency. The ability of the motors to withstand gradual load increase, in the synchronous mode, was examined using ramp loading starting from zero at 2 s. SPMSM lost synchronism at 12 s under 11 Nm load while the IPMSM sustained synchronism until 41 seconds under 40 Nm load. This clearly suggests that the IPMSM has superior load-withstand capability. The superiority is further buttressed with the steady state torque analysis where airgap torque in IPMSM is enhanced by the reluctance torque within 90E to 180E torque angle.
Źródło:
Archives of Electrical Engineering; 2016, 65, 1; 105-116
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of BLDCM with a double 3-phase stator winding and back EMF harmonics
Autorzy:
Drozdowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/950656.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
brushless DC motor
double stator winding
harmonics of back EMF
Opis:
In this paper the mathematical model of the brushless DC motor (BLDCM) with a double 3-phase stator winding is analysed. Both the 3-phase windings are mutually displaced by 30 electrical degree. Special care has been sacrificed to influence of higher harmonics of induced electromotive forces (EMF) on electromagnetic torque and zero sequence voltages that may be used for sensorless control. The mathematical model has been presented in natural variables and, after transformation to symmetrical components, in a vector form. This allows, from one side, for formulating the equivalent circuit suitable for circuit oriented simulators (e.g.: Spice, SimPowerSystems of Simulink) and, from the other point of view, for analysis of higher harmonics influence on control possibilities. These considerations have been illustrated with some results of four quadrant operation obtainded due to simulation at automatic control.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 53-66
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On parameters determination of multi-port equivalent scheme for multi-winding traction transformers
Autorzy:
Sobczyk, T. J.
El Hayek, J.
Powiązania:
https://bibliotekanauki.pl/articles/950657.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multi-winding transformer
equivalent scheme
multi-port circuit
traction transformers
Opis:
This paper aims to present a new equivalent scheme of multi-windings traction transformers, based on multiport purely inductive circuit. The mathematical background of this equivalent scheme is described. The determination of the different scheme elements is made through a finite-elements calculation of both main and leakage inductances, for the case of a four-winding transformer. A procedure is defined, which allows to estimate the values of these elements from some measurements on the transformer at no-load and short-circuit operations. A specific strategy of short-circuit tests is described, allowing to determine all parameters in a rather simple way.
Źródło:
Archives of Electrical Engineering; 2015, 64, 1; 17-27
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 16-30 z 122

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