Insulation-coated electric conductor

Abstract

A multilayer insulation-coated electric conductor for a coil constituting a circuit by forming a welded portion in the coil, wherein at least one layer of the multilayer insulation-coating layers of the coated metal conductor is composed of at least one resin selected from the group consisting of a polyimide resin, a polyesterimide resin, and an H-class polyester resin.

1 . A method of making an insulated electrical conductor comprising: 
 coating a conductor having an oxygen content of 30 ppm or lower with at least one resin selected from the group consisting of a polyimide resin, a polyesterimide resin, and an H-class polyester resin, so as to form a resin underlayer; and    coating the underlayer with a polyamideimide resin so as to form an outermost resin layer.    
   
   
       2 . The method of  claim 1 , further comprising coating the conductor with a polyamideimide resin to form a lowermost resin layer prior to forming the resin underlayer.  
   
   
       3 . The method of  claim 1 , wherein the conductor cross-section is a shape other than round.  
   
   
       4 . The method of  claim 1 , wherein the conductor cross-section is a rectangular shape.  
   
   
       5 . The method of  claim 1 , wherein wax or a lubricant is dispersed in or mixed with a resin forming the outermost resin layer.