Directional electromagnetic steel sheet, manufacturing method of directional electromagnetic steel sheet, coiled core and laminated core

Abstract

[Problem] To provide a directional electromagnetic steel sheet, a method for manufacturing the directional electromagnetic steel sheet, and a coiled core; the directional electromagnetic steel sheet is suitable for controlling the magnetic flux flow between adjacent steel sheets after lamination. [Solution] In a cross section orthogonal to the surface of the steel sheet, the directional electromagnetic steel sheet has a 200 [µm] wide region in a specific direction parallel to the surface of the steel sheet, comprising: a first tensile strain region and a second tensile strain region, which are two tensile strain regions in which tensile strain in the aforementioned specific direction is introduced; and a compressive strain region 12 in which compressive strain in the aforementioned specific direction is introduced; the first tensile strain region 14A and the second tensile strain region 14B are arranged to enclose the compressive strain region 12 in the specific direction; a symmetry axis A0 extending in a direction perpendicular to the surface of the steel sheet is defined by the point of maximum compressive strain of the compressive strain region 12, and at least one of the shapes or distributions of tensile strain magnitudes of the first tensile strain region 14A and the second tensile strain region 14B is different with respect to the symmetry axis A0.

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