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    Wyświetlanie 1-7 z 7
    Tytuł:
    Modelling of a non-linear coil with loss in iron using the Runge-Kutta methods
    Autorzy:
    Kolańska-Płuska, J.
    Grochowicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/141304.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-linear coil
    Runge-Kutta methods
    stiff non-linear differential equations
    Opis:
    This work presents a study on dynamics of a circuit with a non-linear coil, where loss in iron is also taken into account. A coil model is derived using a state space description. The work also includes the development of an application in C# for coil dynamics examination, where the implicit RADAU IIA method of various orders is applied for the purpose of solving non-linear differential equations modelling the non-linear coil with loss in iron.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 3; 527-539
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On determination of inductances for circuit models of AC machines
    Autorzy:
    Sobczyk, T. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141479.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric machines
    modelling magnetic non-linearity
    dynamic inductances
    non-linear inductances
    Opis:
    The paper discuss a problem of determination of inductances for AC machine windings when saturation of magnetic circuit is not neglected. For such cases, computation of magnetic field distribution in the machine magnetic circuit is a starting point for post processing procedures leading to various values, among others the co-energy in a given area and linkage fluxes of windings. This paper shows how to determine winding inductances in a nonlinear magnetic circuit from these two values and also how to compute directly nonlinear inductances. Problem is not trivial because such inductances are not uniquely determined as for linear case. In the paper a definition of nonlinear inductances is proposed which makes the choice unique.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 3; 487-496
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Third harmonic current injection into highly saturated multi-phase machines
    Autorzy:
    Klute, F.
    Jonsky, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/140533.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dq-model
    non-linear effects
    PMSM
    saturation
    third harmonic current injection
    torque improvement
    Opis:
    One advantage of multi-phase machines is the possibility to use the third harmonic of the rotor flux for additional torque generation. This effect can be maximised for Permanent Magnet Synchronous Machines (PMSM) with a high third harmonic content in the magnet flux. This paper discusses the effects of third harmonic current injection (THCI) on a five-phase PMSM with a conventional magnet shape depending on saturation. The effects of THCI in five-phase machines are shown in a 2D FEM model in Ansys Maxwell verified by measurement results. The results of the FEM model are analytically analysed using the Park model. It is shown in simulation and measurement that the torque improvement by THCI increases significantly with the saturation level, as the amplitude of the third harmonic flux linkage increases with the saturation level but the phase shift of the rotor flux linkage has to be considered. This paper gives a detailed analysis of saturation mechanisms of PMSM, which can be used for optimizing the efficiency in operating points of high saturations, without using special magnet shapes.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 179-187
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimum design of non-uniform symmetrical linear antenna arrays using a novel modified invasive weeds optimization
    Autorzy:
    Kenane, E.
    Djahli, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/140370.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    invasive weeds optimization
    non uniform linear array
    optimization
    synthesis
    Opis:
    This paper presents a new modified method for the synthesis of non-uniform linear antenna arrays. Based on the recently developed invasive weeds optimization technique (IWO), the modified invasive weeds optimization method (MIWO) uses the mutation process for the calculation of standard deviation (SD). Since the good choice of SD is particularly important in such algorithm, MIWO uses new values of this parameter to optimize the spacing between the array elements, which can improve the overall efficiency of the classical IWO method in terms of side lobe level (SLL) suppression and nulls control. Numerical examples are presented and compared to the existing array designs found in the literature, such as ant colony optimization (ACO), particle swarm optimization (PSO), and comprehensive learning PSO (CLPSO). Results show that MIWO method can be a good alternative in the design of non-uniform linear antenna array.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 1; 5-18
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of non-linear losses in an integrated contactless power supply for magnetically levitated elevator systems using discrete circuit elements
    Autorzy:
    Putri, A. K.
    Appunn, R.
    Hameyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141742.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contactless energy transmission
    electromagnetic guiding system
    equivalent circuit model
    ferromagnetic material at high frequency
    magnetically levitated elevator
    modelling of non-linear losses
    Opis:
    A contactless energy transmission system is essential to supply onboard systems of electromagnetically levitated vehicles without physical contact to the guide rail. One of the possibilities to realise a contactless power supply (CPS) is by integrating the primary actuator into the guide rail of an electromagnetic guiding system (MGS). The secondary actuator is mounted on the elevator car. During the energy transmission, load dependent non-linear losses occur in the guide rail. The additional losses, which are caused by the leakage flux penetrating into the guide rail, cannot be modelled using the classical approach of iron losses in the equivalent circuit of a transformer, which is a constant parallel resistance to the mutual inductance. This paper introduces an approach for modelling the load dependent non-linear losses occurring in the guide rail using additional variable discrete circuit elements.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 177-187
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the harmonic composition of current in the zero-working wire at the input of the load node with the prevailing non-linear power consumers
    Autorzy:
    Yudaev, Igor V.
    Rud, Evgeny V.
    Yundin, Mikhail A.
    Ponomarenko, Tamara Z.
    Isupowa, Aleksandra M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841306.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    harmonic currents
    non-linear power receiver
    non-symmetry
    three-phase fourwire network
    zero working wire of the network
    prądy harmoniczne
    nieliniowy odbiornik mocy
    niesymetria
    sieć trójfazowa czteroprzewodowa
    zerowy przewód roboczy sieci
    Opis:
    Due to the extensive use of nonlinear power consumers, there is currently an urgent problem of high harmonic content in power supply networks. The paper provides experimental investigations and a study of the nature of the change in the main harmonic components of the current in the neutral working wire of a three-phase four-wire network with a voltage of 0.38 kV. The purpose of this study is to compare the load readings on the amplitude-phase-frequency characteristics of the current in the neutral working wire of the 0.38 kV network with the linear and non-linear load. To study the effect of load changes on the amplitude-phase-frequency characteristics of currents in the linear and zero working wires at the input of the load node, measurements were carried out by certified electrical measuring instruments. The analysis of the results obtained for the load node whose power was formed mainly by a lighting system with fluorescent and LED lamps and a system of office electrical receivers (computers, copiers, printers, scanners, etc.) was performed. It can be concluded that a current comparable to the currents of the linear wires of the network flows from the load node with the predominant nonlinear power receivers through the zero-working wire. At the same time, in the zero-working wire of the network, the third harmonic currents prevail over the main frequency currents.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 463-473
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of higher order forms for the description of electromechanical energy converters
    Autorzy:
    Sobczyk, T. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/141334.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przetwornik elektromechaniczny
    funkcja koenergii
    prąd magnesujący
    indukcyjność nieliniowa
    indukcyjność dynamiczna
    electromechanical converters
    co-energy function
    higher order forms
    magnetizing current
    non-linear inductances
    dynamic inductances
    Opis:
    The purpose of that paper is to develop of unified equations of electromechanical energy converters accounting for the magnetic non-linearity of the main magnetic circuit of a converter. The concept of applying higher order forms of winding currents for the description of the co-energy function is introduced in order to derive the structure of converter equations via mathematical analysis. Also, another concept of equivalent magnetizing currents is applied to determine the higher order forms for selected converters designs. The structure of circuital equations for converters with multiple windings has been unified by means of the introduction of matrices of dynamic and nonlinear inductances following the higher order forms of the co-energy function.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 1; 67-75
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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