Wound Core

Abstract: Provided is a wound core which is constructed by laminating a plurality of bent bodies in a plate thickness direction, the bent bodies being obtained by forming a grain-oriented electrical steel sheet. The wound core includes a plurality of flat portions and a plurality of corner portions. The bent bodies each include a plurality of flat areas and a plurality of bend areas adjacent to the flat areas. The radius of curvature of each bend area is less than or equal to 5.0 mm. The bent bodies each include one or more joint portions where end faces of the grain-oriented electrical steel sheet in the longitudinal direction thereof face each other. In the wound core, an average distance of a first group of joint portions and an average distance of a second group of joint portions according to a predetermined condition are greater than or equal to 25 mm. In this way, it is possible to avoid interference between the plastic strain and elastic strain in a bend area and the sheering strain in a joint portion, and to suppress iron loss.

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