INSULATED WIRE AND WINDING

摘要

Provided are an insulated wire that has an excellent partial discharge resistance after being formed into a coil, and a winding formed of the insulated wire. The insulated wire 10 includes a conductor 1, a first insulation coating layer 2 which is provided directly on the conductor 1 and is formed of a polyamide-imide resin that contains dispersed inorganic fine particles, and a second insulation coating layer 3 which is provided on the outer circumference of the first insulation coating layer 2 and is formed of a polyamide-imide resin or a polyimide resin. The minimum number-of-turns diameter that does not cause a crack in the first insulation coating layer 2 when the insulated wire is elongated by 30% by a method in compliance with JISC 3216 "5.1.1" and is wound around a winding bar is greater than 2d but smaller than 4d (where d is an external diameter (self-diameter) of insulated wire).