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Overloss coefficient in magnetic laminations during PWM supply voltage

Zakrzewski K.

Archives of Electrical Engineering

2010

Vol. 59, nr 3-4

169-176

Author presents an analytical method of calculation of unit power losses in magnetic laminations used in electrical machines and transformers. The idea of this method, based on the solution of Maxwell's equations in the lamination material, was described by the author in the previous work [3], taking into account approximation of constitutive static hysteresis loop by elliptic form of the function B = f(H) depending on magnetic saturation. In the previous formula for new isotropic and anisotropic materials it is needed to introduce so called "anomaly coefficient" deduced from the comparison of measured and calculated value of power losses in arbitrary excitation frequency for assumed induction. The method was tested by comparison with the results of experiments presented in commercial catalogues [1, 2]. Assuming superposition of harmonic power losses it is possible to enlarge this method for the estimation of overloss coefficient in dynamo sheet during axial magnetization with nonsinusoidal flux generated e.g. by PWM voltage supply.

Space and time distribution of magnetic field in 2D magnetizers

Bottauscio O., Chiampi M., Fiorillo F., Manzin A.

Przegląd Elektrotechniczny

2005

R. 81, nr 5

8-12

Different setups for two-dimensional excitation of soft magnetic laminations are investigated by means of a finite element procedure. For any envisaged configuration, the space-time distribution of the generated field is determined and the ensuing 2D magnetic flux behavior in the test lamination, assumed isotropic, is calculated. Two-phase and three-phase supply systems provide similar outcomes in square and circular/hexagonal samples, respectively. However, the latter geometry leads to the highest homogeneity of the induction in the test specimen.

Zbadano metodą elementu skończonego różne rodzaje układów magnesowania przy wymuszeniu dwuwymiarowym. W każdym przypadku analizowano pole magnetyczne zmienne w czasie i w dwuwymiarowej przestrzeni uwzględniając laminację. Dwufazowe i trójfazowe wymuszenie generuje podobne pole w próbkach kwadratowych, kołowych i sześciokątnych. Najlepszą jednorodność namagnesowania zaobserwowano w próbce sześciokątnej.