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Analysis of electromagnetic phenomena in electromechanical converters using field approach dynamic state simulations
Języki publikacji
Abstrakty
W pracy przedstawiono algorytmy analizy dynamicznych stanów pracy przetworników elektromechanicznych na podstawie trójwymiarowych modeli polowych. Rozpatrzono układy z masywnymi elementami przewodzącymi o uzwojeniach wykonanych z cienkich przewodów. Szczególną uwagę poświęcono zagadnieniom związanym z symulacją ruchu na modelu o elementach skończonych. Przedstawiono wyniki obliczeń dla dwóch przykładów. Analizowano zjawiska w silniku magnetoelektrycznym o magnesach wykonanych z materiału przewodzącego oraz zjawiska w silniku liniowym o masywnej części wtórnej.
The paper presents algorithms for dynamic analysis of electromechanical converters - on the basis of three dimensional field models. Systems containing solid conducting parts and filamentary windings have been considered. Special attention for movement finite element modelling has been paid. In this case, the equation of the mechanical motion must be taken into consideration. In order to solve this equation, the explicit or implicit time-stepping algorithm can be applied - expressions (2) and (3). The implicit procedure is unconditionally stable but it requires the iterative calculations. During the movement, the geometric structure of the considered region is changing. Therefore, the grid remeshing is required. Method of remeshing depends on the type of problem. Two main approaches are possible to applied: (a) the nodes within moving region are fixed and (b) the nodes move in accordance with this region. In case of infinitely long moving part with constant permeability, as for example in linear induction motor, the movement modelling is relatively simple task. During the dynamic process, the entirely constant mesh can be applied. The additional term in equation (1), proportional to velocity of the moving body may be omitted if the special procedure of estimation of derivative dA/dt - according to formulae (6) - is applied. Problem is still more complicated in case of short moving part. In such case, the polynomial or Fourier's interpolation of the FE matrices is proposed. The grid is entirely constant. On the basis of "grid positions", the Newton polynomial or Fourier's series is constructed. If the total displacement of the moving body is limited, then the distorted element method may be applied. However, the distortion of the elements causes additional formal changes of the magnetic stored energy and therefore causes additional parasitic components of the electromagnetic force or torque. As an illustration of the elaborated algorithms, the operation of the synchronous motor with conducting permanent magnet and start-up operation of the linear induction motor have been investigated.
Czasopismo
Rocznik
Tom
Strony
47-60
Opis fizyczny
Bibliogr. 16 poz., rys.
Twórcy
autor
autor
autor
- Instytut Elektrotechniki Przemysłowej, Politechnika Poznańska
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Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-BPS2-0014-0041