Temat: trwały - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Boundary-integral model of permanent magnet of a tube segment as shape
Autorzy:: Pawluk, K.
Sulima, R.
Powiązania:: https://bibliotekanauki.pl/articles/140403.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnes trwały
metoda całkowo-brzegowa
całki eliptyczne
permanent magnets
boundary integral method
elliptic integrals
Opis:: The magnetic field due to a permanent magnet of a tube-side segment as shape and of radial-oriented magnetization is considered. Such a sheet modelling a single pole of the magnet is used to express the suitable contribution to magnetic quantities. A boundary-integral approach is applied that is based on a virtual scalar quantity attributed to the magnet pole. Such an approach leads to express analytically the scalar magnetic potential and the magnetic flux density by means of the elliptic integrals. Numerical examples of the computed fields are given. The general idea of the presented approach is mainly directed towards designing the magnetic field within the air gap of electric machines with permanent magnets as an excitation source. Other technical structures with permanent magnets may be a subject of this approach as well.
Źródło:: Archives of Electrical Engineering; 2011, 60, 4; 413-432
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Energy conversion in small water plants with variable speed PM generator
Autorzy:: Sobczyk, T. J.
Mazgaj, W.
Szular, Z.
Węgiel, T.
Powiązania:: https://bibliotekanauki.pl/articles/140885.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: magnes trwały
prądnica
prostownik PWM
mała energetyka wodna
energetyka wodna
permanent magnet generator
PWM rectifier
small hydro power
Opis:: The Small Hydro Power Plants allow to increase the energy amount from renewable sources, especially from small rivers in mountainous areas. This paper presents a new concept of a energy conversion system for application in a Small Hydropower Plant (SHP) which is based on a permanent magnet generator (PM generator) with a propeller turbine integrated with the generator rotor. The PM generator can work at a variable speed and therefore energy produced by the PM generator has to be converted by means of a power electronic unit to fit to the three-phase power grid parameters. For this concept, dimensions and parameters of the PM generator were specially designed on account of integration with water turbine. The paper precisely describes elements of energy conversion system and also presents the results of numerical tests for chosen working conditions. An original algorithm of control strategy for power electronic unit was used to adjust generated energy to the required parameters of the three-phase grid.
Źródło:: Archives of Electrical Engineering; 2011, 60, 2; 159-168
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Transients of electrical and mechanical quantities of a brushless DC motor - computations, measurements
Autorzy:: Ciurys, M.
Dudzikowski, I.
Powiązania:: https://bibliotekanauki.pl/articles/141324.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: maszyna elektryczna
silnik bezszczotkowy
magnes trwały
silnik BLDC
obliczenia
pomiary
electrical machines
BLDC motors
permanent magnets
computations
measurements
Opis:: The paper presents a method of computing electrical and mechanical variables of BLDC motors. It takes into account electrical, magnetic and mechanical phenomena in the power supply-converter-BLDC motor-load machine system. The solution to the problem is the so-called circuit-field method. The results determined with the use of time stepping finite element method were used as the parameters of equations of the developed mathematical model. Losses in the motor, losses in transistors and diodes of the converter as well as the actual back EMF waveforms, variable moment of inertia and variable load torque are accounted for. The designed laboratory stand and the test results are presented in the paper. The experimental verification shows the correctness of the developed method, algorithm and program. The developed computational method is universal with respect to different electromechanical systems with cylindrical BLDC motors. It can be applied to electromechanical systems with BLDC motors operating at constant but also variable load torque and moment of inertia.
Źródło:: Archives of Electrical Engineering; 2011, 60, 1; 23-34
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Modified concept of permanent magnet excited synchronous machines with improved high-speed features
Autorzy:: May, H.
Palka, R.
Paplicki, P.
Szkolny, S.
Canders, W.-R.
Powiązania:: https://bibliotekanauki.pl/articles/140362.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pojazd elektryczny
magnes trwały
maszyna synchroniczna
osłabianie pola
electric vehicles
permanent magnet
synchronous machines
field weakening
optimal feeding
Opis:: Permanent magnet (PM) excited synchronous machines used in modern drives for electro-mobiles suffer in high speed regions from the limited battery-voltage. The field weakening requires designing machines with reduced power conversion properties or increasing the size of the power converter. A new concept of such a machine features PM excitation, single-tooth winding and an additional circumferential excitation coil fixed on the stator in the axial center of the machine. By the appropriate feeding of this coil, the amplitude of the voltage effective excitation field can be varied from zero to values above those of the conventional PM-machines. The capability of reducing the excitation field to zero is an important safety aspect in case of failing of the feeding convertor.
Źródło:: Archives of Electrical Engineering; 2011, 60, 4; 531-540
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A coupled field-circuit model of a 5-phase permanent magnet tubular linear motor
Autorzy:: Tomczuk, B.
Waindok, A.
Powiązania:: https://bibliotekanauki.pl/articles/141318.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: silnik synchroniczny liniowy
magnes trwały
PMLSM
metoda polowo-obwodowa
symulacja
parametry sterowania
permanent magnet linear synchronous motors
field-circuit method
simulation of the transients
control parameters
Opis:: A method for modeling of the dynamics characteristics for a 5-phase permanent magnet tubular linear motor (PMTLM) is presented. Its electromagnetic nonlinear field analysis with finite element method (FEM) has been coupled with the circuit model. The calculation model includes the equations for electrical circuits and mechanical quantities as well. They have been obtained using Lagrange's method. The calculated and measured waves of the mover position have been compared for several values of the excitation current. This comparison yields a good agreement. Presented calculation model is very useful in designing and optimization of the PMTLM and in the calculation of the parameters for the control algorithms intended for such a type of actuators.
Źródło:: Archives of Electrical Engineering; 2011, 60, 1; 5-14
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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