TY - JOUR N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/84455/PDF/05_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/84455 PY - 2010 IS - No 3 - 4 December EP - 176 DO - 10.2478/s10171-010-0013-0 KW - magnetic laminations KW - power losses KW - PWM voltage A1 - Zakrzewski, Kazimierz PB - Polish Academy of Sciences VL - vol. 59 DA - 2010 T1 - Overloss coefficient in magnetic laminations during PWM supply voltage SP - 169 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/84455 T2 - Archives of Electrical Engineering ER -