Patent ID: 8427271

Claim:
A reactor part, comprising: at least a winding and a magnetic substance core, wherein said core comprises: a pair of winding portions around each of which said winding is wound; and a non-winding portion around which no winding is wound, wherein a cross-sectional area of said non-winding portion, located in a centerline of said core, in a direction orthogonal to a magnetic path of said non-winding portion of said core is smaller than a cross-sectional area in a direction orthogonal to a magnetic path of said each of winding portions, wherein the cross-sectional area of said non-winding portion is at least 0.67 times of a cross-sectional area of said each of winding portions, and wherein said non-winding portion comprises two non-winding portions, each comprising an approximately trapezoidal or triangular magnetic substance block.