Abstract: A method of continuously forming edgewise wound cores. A continuous strip of ferromagnetic material is fed to a winding station and through a means operable generally for severing the continuous strip, and the continuous formation of the edgewise wound cores is effected at the winding station from the continuous strip fed thereto. The thickness of the continuous strip is measured along the length of the continuous strip fed to the winding station, and the thickness measurements are summed. The summation of the thickness measurements are compared with a preselected value corresponding to a predetermined stack height for each of the edgewise wound cores formed at the winding station, and the severing means is operated to sever the continuous strip at least generally when the summation of the thickness measurements attains the preselected value thereby to terminate the formation of respective ones of the edgewise wound cores at the winding station.

Abstract: A core loss tester employs separate cables for excitation and pickup. Testing is performed at a fixed flux density in the ferromagnetic core. A processing circuit on the output of the pickup coil scales the voltage developed so that, when excitation current is increased so that the indicated output of the pickup coil equals the effective cross-sectional area of the flux path, the fixed predetermined value of flux density is produced. When this condition is achieved, the excitation current times the sensed flux-induced voltage provides a measurement of the core loss in watts. Excitation is accomplished with a multi-conductor cable looped once or more times through the core with the conductors in the cable connected in series by mating together of a connector at each end.