Process for preparing wound core having low core loss

Details Process for preparing wound core having low core loss Process for preparing wound core having low core loss

C - Chemistry, Metallurgy

21

D

148/8

C21D 8/12 (2006.01) C21D 9/52 (2006.01) H01F 41/06 (2006.01)

Patent

CA 2027316

- 11 - PROCESS FOR PREPARING WOUND CORE HAVING LOW CORE LOSS ABSTRACT OF THE DISCLOSURE The present invention provides a wound core having a low core loss and not susceptible to a disappearance of the core loss lowering effect due to a magnetic domain refining even when stress-relief annealing is conducted after fabrication of a steel strip into a wound core, through a process which comprises, fabricating a very thin silicon steel strip comprising by 6.5% weight or less of silicon with the balance consisting essentially of iron and having a sheet thickness of 100 µm or less and a magnetic flux density (B8 value) of 1.80T or more into a wound core, subjecting the wound core to stress-relief annealing, unwinding the very thin silicon steel strip from the core, introducing into the very thin silicon steel strip a linear or dotted local strain in a direction at an angle of 45° to 90° to the rolling direction of the thin strip, and rewinding the thin strip onto the core.

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