Magnet wire having enamel with a boron nitride filler

Abstract

A magnet wire having a boron nitride filled enamel. The enamel can be a resin material having boron nitride particles in an amount effective to impart corona resistance to the magnet wire. A method for manufacturing the magnet wire is also disclosed.

What is claimed is:  
     
         1 . A magnet wire having corona resistant properties, said magnet wire comprising: 
 a conductor strand; and    an enamel disposed on said conductor strand, said wire enamel comprising a resinous material and boron nitride in an amount effective to increase corona resistance of the magnet wire.    
     
     
         2 . A magnet wire as recited in  claim 1 , wherein said enamel comprises a boron nitride suspension.  
     
     
         3 . A magnet wire as recited in  claim 2 , wherein said resinous material comprises at least one of polyethylene, polyamide, polyetherimide, polyester, polyamideimide, polyesteramideimide and polyesterimide resin.  
     
     
         4 . A magnet wire as recited in  claim 3 , comprising boron nitride having a platelet shape.  
     
     
         5 . A magnet wire as recited in  claim 1 , wherein said boron nitride has an average particle diameter of about 0.16 micron or less.  
     
     
         6 . A magnet wire as recited in  claim 1 , wherein said conductor strand is circular in cross-section.  
     
     
         7 . A magnet wire as recited in  claim 1 , wherein said conductor strand is rectangular in cross-section.  
     
     
         8 . A magnet wire as recited in  claim 1 , wherein said enamel comprises about 1% to 35% by weight of said boron nitride.  
     
     
         9 . A magnet wire as recited in  claim 1 , wherein said enamel layer is in direct contact with said conductor strand.  
     
     
         10 . A method of manufacturing corona resistant magnet wire comprising the steps of: 
 coating a conductor strand with an enamel comprising a resinous material and boron nitride in an amount effective to increase the corona resistance of the magnet wire;    curing said enamel onto said conductor strand.    
     
     
         11 . A method as recited in  claim 10 , wherein the enamel comprises a boron nitride suspension.  
     
     
         12 . A method as recited in  claim 10 , wherein the resinous material in said coating step comprises at least one of polyethylene, polyamide, polyetherimide, polyester, polyamideimide, polyesteramideimide and polyesterimide resin.  
     
     
         13 . A method as recited in  claim 10 , wherein the boron nitride has an average particle diameter of about 0.16 micron or less.  
     
     
         14 . A method as recited in  claim 10 , wherein the conductor strand is circular in cross-section.  
     
     
         15 . A method as recited in  claim 10 , wherein the conductor strand is rectangular in cross-section.  
     
     
         16 . A method as recited in  claim 10 , wherein the enamel comprises about 1% to 35% by weight of the boron nitride.  
     
     
         17 . A method as recited in  claim 10 , wherein said curing step comprising heating said conductive wire coated with enamel to a temperature of between 330 and 370° C. until said enamel has been cured.  
     
     
         18 . A method as recited in  claim 10 , wherein said boron nitride comprises platelet shaped particles.  
     
     
         19 . A method for increasing corona resistance of a magnet wire comprising applying to a conductor strand an enamel comprising a resinous material and boron nitride in an amount effective to increase corona resistance of the magnet wire.  
     
     
         20 . A method as recited in  claim 19 , wherein said enamel comprises a boron nitride suspension.