Wound Core

Abstract: This wound core comprises a wound core body having a substantially rectangular shape in a side surface view, wherein in the wound core body, a first flat surface part and corner part are alternately continuous in the longitudinal direction, each corner part has a curved shape in a side surface view of a grain-oriented electrical steel sheet, there are two or more bent parts having a second flat surface part between adjacent bent parts, and in a first flat surface part and second flat surface part in the vicinity of at least one of the bent parts, the following equation (1) is satisfied. (1): (Nac + Nal)/Nt = 0.010. Nt is the total number of grain boundary determination points in the first flat surface part and second flat surface part region adjacent to the curved part, and Nac and Nal are each the number of determination points in which a subgrain boundary can be confirmed in a direction parallel to or perpendicular to the bending part boundary.

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