Abstract
Magnetic properties of electrical steel sheets are usually measured by using a single-sheet tester or Epstein‘s tester. The permeability is measured as a scalar value, that is, the relationship between the magnetic flux density B and the magnetic field intensity H in only the rolling direction, and the measured value represents an average for the specimens. However, it is well known that the local distributions of B and H are not uniform in a grain-oriented silicon steel sheet. The reasons for this are closely related to not only the magnetic properties, but also the local loss distributions. Thus it is necessary to measure the local B and H as vector variables and to estimate the local iron losses with those vector relations in constructed cores. In this paper, the relationship between the grain form and the local iron loss distribution is investigated in detail by using a grain-oriented 3% silicon steel sheet without insulator coating.
