Flat rectangular insulated wire material for coil and manufacturing method thereof

摘要

PROBLEM TO BE SOLVED: To provide a square insulating conductor material of which the ratio in length between a major axis and a minor axis is 15 or more, the length of the minor axis is 0.3-1.2 mm, a curvature radius at a corner can be formed precisely, with no burring, with less bending and deflection, and the surface roughness is uniform and good, with a stable resin coating available.SOLUTION: The square insulating conductor material is made from tough pitch copper or oxygen-free copper, of which a ratio a/b between length a of major axis and length b of minor axis constituting a square cross section is 15 or higher, the length b in the minor axis is 0.3-1.2 mm, corner parts 5 formed at four corners of the square cross section are bevelled with a curvature radius of 0.05-0.60 mm, an arithmetic average roughness Ra on the surface of the corner part is 0.05-0.3 μm, a maximum height Rz is 0.5-2.5 μm, and a ratio (Rq/Rz) between a root-mean-square roughness Rq and the maximum height Rz is 0.06-1.1.