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1
Content available remote Detection and FEM Analysis of Additional Cogging Torque Components in PM Motors
Gasparin L., Fiser R.
Przegląd Elektrotechniczny
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2008
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R. 84, nr 12
163-166
EN
This paper presents issues for reducing cogging torque of permanent-magnet motors. When proper methods are employed, it is theoretically possible to minimize its level or even to eliminate it. FFT analyses of cogging torque in mass-produced motors have shown additional harmonic components, which are in tight correlation with assembly tolerances and/or permanent-magnet imperfections. Finite element method has been used to study the sensitivity of different motor models relative to manufacturing tolerances and to determine rules for detecting imperfections in mass-production.
PL
Artykuł przedstawia problem redukcji momentu zaczepowego w silnikach z magnesami trwałymi. Jeśli metody analizy są poprawne to moment ten można zminimalizować, lub wręcz zlikwidować. Analiza FFT wykorzystana w produkcji masowej pokazała dodatkowe sładowe harmoniczne w przebiegu momentu, mające ścisłe korelacje z tolerancjami w montażu czy też niedoskonałościami w materiale magnetycznym. MES została wykorzystana w badaniu czułości różnych modeli silnika na tolerancje montażowe oraz do określenia zasad wykrywania niedoskonałości w produkcji masowej.
2
Content available remote Estimation of permanent magnet protective plate effect on dynamic characteristics of PMLSM
Bugeza M., Fiser R.
Przegląd Elektrotechniczny
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2006
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R. 82, nr 5
26-29
EN
The article presents the study of the influence of a stainless steel protective plate on motor performance introducing the equivalent circuit modification. The finite element method (FEM) is used to determine the magnetic field of the permanent magnet linear synchronous motor (PMLSM). Field results are the basis for calculations of the PMLSM's equivalent circuit elements. The dynamic model of the PMLSM is derived from the equivalent circuit and the mechanical relations. Several thicknesses of the stainless steel protective plate are analysed and evaluated.
PL
W artykule przedstawiono badania wpływu stalowej płyty ekranującej na działanie silnika poprzez wprowadzenie modyfikacji zastępczego obwodu. Wykorzystano metodę elementów skończonych do określenia pola magnetycznego w liniowym silniku synchronicznym z magnesami trwałymi. Wyniki obliczeń zostały wykorzystane do budowy zastępczego obwodu.
3
The application of the finite element method in diagnostics of electrical drives
Fiser R., Ferkolj S.
Journal of Technical Physics
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2002
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Vol. 43, no 4
399-403
EN
The paper presents the application of the finite element method for predicting the performance of induction motor having asymmetry of stator and/or rotor winding due to the different combination and propagation of faults gained during heavy-duty operation. Quantities like magnetic vector potential, flux density, force components, rotor and stator currents, mutual and leakage inductance are determined very precisely. The detailed insight in magnetic field distribution of a squirrel cage induction motor, forms the basis for further evaluation of its operational behaviour. Increasing anomaly in magnetic field distribution due to the increasing stage of faults propagation results in a degradation of steady-state and dynamic performance of the induction motor and can be evaluated with computer simulation eliminating expensive and time-consuming laboratory tests.
4
Calculation of linear induction motor performance using finite element method
Bugeza M., Fiser R., Ferkolj S.
Journal of Technical Physics
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2002
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Vol. 43, no 4
369-375
EN
The paper presents the calculation of a linear induction motor steady-state and dynamic characteristics using the finite element method. The 2D nonlinear eddy-current solver was used for magnetic field and force calculations. Quantities like magnetic vector potential, flux density, force components, primary and secondary currents, mutual and leakage inductance, can be determined very precisely. The detailed insight in magnetic field distribution of a linear induction motor forms the basis for evaluation of its operational behaviour. The results obtained by the finite element method are further used in the process of the mathematical modelling and control simulation based on the space vector theory.
5
2D numerical model of electromagnetic structures for educational purposes
Bugeza M., Fiser R.
Journal of Technical Physics
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2002
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Vol. 43, no 4
359-368
EN
The paper presents the development of a software package for static and time-variable magnetic field calculations in 2D electromagnetic structures for educational purposes. It has a simple and clear structure in order to assure students a simple tool for studying electromagnetic fields. It enables the step-by-step insight into the procedure of the pre-processor, structure of the solvers and representation of the results. The computational results are also compared with other FEM packages and have proved to be of a significant practical value in the post-graduate courses.
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