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    Wyświetlanie 1-3 z 3
    Tytuł:
    Electromagnetically excited audible noise - evaluation and optimisation of electrical machines by numerical simulation
    Autorzy:
    Schlensok, C.
    Schmülling, B.
    Giet, M.
    Hameyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/262795.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    numerical simulation
    electrical machines
    FEM
    BEM
    acoustics
    structured analysis
    Opis:
    Disturbing vibrations and noise of electrical machines are gaining impact. Therefore, it is necessary to estimate the electromagnetic, structure-dynamical, and acoustic behavior of the machine during designing and before prototyping. An adequate tool is numerical simulation applying the Finite-Element Method (FEM) and the Boundary-Element Method (BEM) allowing for the structured analysis and evaluation of audible noise also caused by manufacturing tolerances. The methods developed and proved at the Institute of Electrical Machines (IEM) at RWTH Aachen University can be applied to any electromagnetic device in general.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 121-128
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the mechanical fatigue progress on the magnetic properties of electrical steel sheets
    Autorzy:
    Karthaus, J.
    Steentjes, S.
    Gröbel, D.
    Andreas, K.
    Merklein, M.
    Hameyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141347.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cyclic mechanical stress
    electrical machines
    electrical steel sheets
    magnetic properties
    material fatigue
    Opis:
    The purpose of this paper is to study the variation of the magnetic properties of non-oriented electrical steel sheets with the fatigue state during cyclic mechanical loading. The obtained results are central to the design of variable drives such as traction drives in electric vehicles in which varying mechanical loads, e.g. in the rotor core (centrifugal forces), alter the magnetic properties. Specimens of non-oriented electrical steel are subject to a cyclically varying mechanical tensile stress with different stress amplitudes and number of cycles. The specimens are characterised magnetically at different fatigue states for different magnetic flux densities and magnetising frequencies. The measurements show a variation in magnetic properties depending on the number of cycles and stress magnitude which can be explained by changes in the material structure due to a beginning mechanical fatigue process. The studied effect is critical for the estimation of the impact of mechanical material fatigue on the operational behaviour of electrical machines. Particularly in electrical machines with a higher speed where the rotor is stressed by high centrifugal forces, material fatigue occurs and can lead to deterioration of the rotor’s stack lamination.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 2; 351-360
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operating point resolved loss computation in electrical machines
    Autorzy:
    von Pfingsten, G.
    Ruf, A.
    Steentjes, S.
    Hombitzer, M.
    Franck, D.
    Hameyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/141566.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    efficiency maps
    material degradation
    magnetic losses
    magnetic material
    behaviour
    soft magnetic materials
    electrical machines
    Opis:
    Magnetic circuits of electromagnetic energy converters, such as electrical machines, are nowadays highly utilized. This proposition is intrinsic for the magnetic as well as the electric circuit and depicts that significant enhancements of electrical machines are difficult to achieve in the absence of a detailed understanding of underlying effects. In order to improve the properties of electrical machines the accurate determination of the locally distributed iron losses based on idealized model assumptions solely is not sufficient. Other loss generating effects have to be considered and the possibility being able to distinguish between the causes of particular loss components is indispensable. Parasitic loss mechanisms additionally contributing to the total losses originating from field harmonics, non-linear material behaviour, rotational magnetizations, and detrimental effects caused by the manufacturing process or temperature, are not explicitly considered in the common iron-loss models, probably even not specifically contained in commonly used calibration factors. This paper presents a methodology being able to distinguish between different loss mechanisms and enables to individually consider particular loss mechanisms in the model of the electric machine. A sensitivity analysis of the model parameters can be performed to obtain information about which decisive loss origin for which working point has to be manipulated by the electromagnetic design or the control of the machine.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 1; 73-86
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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