Rotational Power Losses and Vector Loci Under Controlled High Flux Density and Magnetic Field in Electrical Steel Sheets

摘要

This paper presents the rotational power loss$P$, curves measured for nonoriented, conventional grain-oriented and high-permeability grain-oriented electrical steel under controlled loci of flux density$B$, or magnetic field$H$. The$P$is measured at 10, 50, and 250 Hz with the radius of circular loci of$B$being controlled from 0.5 to 2.0 T and the radius of circular loci of$H$from 50 to 20 kA/m. The well-known phenomenon of decreasing$P$at higher magnetization is confirmed in the results. The maximum$P$under controlled circular$H$can be up to 2.5 times higher than under controlled circular$B$and up to six times higher than the value of alternating loss for anisotropic electrical steels. In thicker laminations at higher frequencies, the peaks in$P$curves vanish due to increased contribution of eddy currents.