Multilayer insulated wire and transformer using the same

Abstract

A multilayer insulated wire, comprising: a conductor; and at least three extruded insulation layers covering the conductor, which extruded insulation layers comprise: (A) an outermost layer composed of an extruded covering layer of a resin whose elongation rate after heat treatment by immersion in a solder at 150° C. for two seconds is at least 290% and at least equal to elongation rate before the heat treatment; (B) an innermost layer comprising a resin whose elongation rate after heat treatment by immersion in a solder at 150° C. for two seconds is at least 290% and at least equal to elongation rate before the heat treatment; and (C) an insulation layer that is placed between the outermost layer and the innermost layer and that is composed of an extruded covering layer of a crystalline resin with a melting point of at least 280° C. or an amorphous resin with a glass transition temperature of at least 200° C.; and a transformer having the multilayer insulated wire.

Dependencies are inferred from the claim text.