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Estimation of coefficients of multivariable power series approximating magnetic nonlinearity of AC machines

Sobczyk T. J., Warzecha A.

Archives of Electrical Engineering

2015

Vol. 64, nr 3

379--389

Energy based approach was used in the study to formulate a set of functions approximating the magnetic flux linkages versus independent currents. The simplest power series that approximates field co-energy and linked fluxes for a two winding core of an induction machine are described by a set of common unknown coefficients. The authors tested three algorithms for the coefficient estimation using Weighted Least-Squared Method for two different positions of the coils. The comparison of the approximation accuracy was accomplished in the specified area of the currents. All proposed algorithms of the coefficient estimation have been found to be effective. The algorithm based solely on the magnetic field co-energy values is significantly simpler than the method based on the magnetic flux linkages estimation concept. The algorithm based on the field co-energy and linked fluxes seems to be the most suitable for determining simultaneously the coefficients of power series approximating linked fluxes and field co-energy.

Identification of a PM synchronous motor parameters based on finite element analysis

Petkovska L., Cvetkovski G.

Przegląd Elektrotechniczny

2005

R. 81, nr 12

10-15

The paper deals with calculation of parameters of a permanent magnet synchronous motor. In addition, steady-state characteristics are calculated, too. For this purpose, Finite Element Method is applied. The results of numerical calculations are presented in figures and by diagrams. An evaluation on the influence of the parameters on the behaviour of a permanent magnet synchronous motor (PMSM) is presented. When possible, calculated parameters are compared with testing results. Experimentally and numerically obtained values are showing an excellent agreement.

W artykule przedstawiono obliczenia parametrów silnika synchronicznego z magnesami trwałymi. Wyznaczono charakterystyki stanu ustalonego metodą elementów skończonych MES. Wyniki obliczeń numerycznych przedstawiają rysunki i diagramy. Oszacowanie wpływu tych parametrów na zachowanie się silnika zostało porównane z wynikami eksperymentów - osiągnięta została doskonała zgodność.