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 multilayer insulation-coated electric conductor comprising a conductor with a plurality of layers of insulation-coating provided thereon in which short insulation-coated electric conductors formed into partial shapes of a coil are molded to join together, wherein the uppermost layer of the multilayer insulation-coating layers consists essentially of a polyamideimide resin, and wherein an under insulation-coating layer adjacent to the uppermost layer consists essentially of at least one resin selected from the group consisting of a polyimide resin, a polyesterimide resin, and an H-class polyester resin.  
   
   
       2 . The coated metal conductor according to  claim 1 , wherein the lowermost layer of the insulation-coating layers of the multilayer insulation-coated electric conductor consists essentially of a polyamideimide resin.  
   
   
       3 . The coated metal conductor according to  claim 1  wherein the metal conductor is low-oxygen copper with an oxygen content of 30 ppm or lower, or an oxygen-free copper.  
   
   
       4 . The coated metal conductor according to  claim 1  wherein a cross-section of the conductor has a shape other than round.  
   
   
       5 . The coated metal conductor according to  claim 1  wherein the cross-section of the conductor has a rectangular shape.  
   
   
       6 . The coated metal conductor according to  claim 1  wherein wax or a lubricant is dispersed in or mixed with a resin for forming the uppermost layer of the multilayer insulation-coating layers.