Comparison of different measuring procedures for the determination of the magnetic characteristics of electrical sheet steels using single sheet testers
Measurements are reported which were performed using two single sheet testers (SST) with different yoke designs and varied coil systems, whereby the magnetic field strength was determined from the magnetising current (MC method) and, alternatively, using tangential field sensing coils (H coil method). The measurements were supported by the Community Bureau of Reference (BCR) of the European Community, as a supplement to the project "Intercomparison of power loss measurements using single sheet testers" in which 6 European laboratories took part. The measurements were carried out using digital procedures to ensure a high degree of comparability. The two methods used here yield results which differ by a few per cent. The differences are discussed with respect to the influence of geometric parameters and of the permeability of the specimen under test. It is demonstrated that the H coil method is more sensitive to disturbing external fields. From that it can be concluded that the MC method promises better repeatability and reproducibility. The Epstein to SST relation for the two testers is considered on the basis of corresponding comparisons using specimens having widely spread characteristics.
Bibliographic Reference: EUR 12265 EN (1989) MF, 31 pp., ECU 4, blow-up copy ECU 5
Record Number: 198910972 / Last updated on: 1994-12-01
Original language: en
Available languages: en