Electric wire for high frequency, high voltage and large current

Abstract

An electric wire contains a conductive wire having at least a groove structured on the surface of the conductive wire, and an additional wire to be filled into the groove. The groove is provided on an outer surface of the conductive wire along a longitudinal direction of the conductive wire. The additional wire is inserted in the groove.

What is claimed is: 
     
       1. An electric wire comprising:
 a conductive wire, which has substantially a quadrilateral cross-sectional shape; and   an insulator placed along a longitudinal direction of the conductive wire at a corner of the quadrilateral;   a groove provided along the longitudinal direction of the conductive wire at the corner of the quadrilateral;   wherein the insulator is placed in the groove.   
     
     
       2. The electric wire of  claim 1 ,
 wherein a width of the insulator is less than one third of a width of the conductive wire.   
     
     
       3. The electric wire of  claim 1 ,
 wherein the insulator is made of a synthetic resin.   
     
     
       4. The electric wire of  claim 1 ,
 wherein insulators are placed at all corners of the quadrilateral.   
     
     
       5. The electric wire of  claim 1 , further comprising:
 an additional wire inserted in the conductive wire along the longitudinal direction of the conductive wire;   wherein the additional wire comprises a conductive member;   wherein the conductive wire and the conductive member are made of different materials; and   wherein the conductive member is in contact with the conductive wire.   
     
     
       6. A coil comprising the electric wire of  claim 1 , the electric wire being wound on a bobbin so that a corner of a quadrilateral is adjacent to a corner of a next quadrilateral in a cross sectional view. 
     
     
       7. An electric wire comprising:
 a conductive wire having substantially a quadrilateral cross-sectional shape;   a groove provided along a longitudinal direction of the conductive wire at each corner of the quadrilateral, wherein an insulator is placed into the groove along the longitudinal direction of said conductive wire;   an additional wire, comprising a conductive member, inserted into the conductive wire along the longitudinal direction of said conductive wire, wherein said additional wire is sized to fit into another groove located around a middle point of each sides of said quadrilateral; and   an insulator sheath covering entirely an outer surface of the conductive wire, covering all sides and all corners of the quadrilateral,   
       wherein:
 the conductive wire and the additional wire are made of different materials, and the conductive member is in direct contact with the conductive wire. 
 
     
     
       8. The electric wire of claim 7, wherein the conductive wire is made of materials comprising aluminum and the conductive member is made of material comprising copper. 
     
     
       9. The electric wire of claim 7, a resistance of the conductive wire at 200° C. is at most 1.42 times and at least 1.00 time larger than a resistance of the conductive wire at 50° C. 
     
     
       10. An electric wire comprising:
 a conductive wire having substantially a quadrilateral cross-sectional shape;   a groove provided along a longitudinal direction of the conductive wire;   an additional wire, comprising a conductive member, inserted into the conductive wire along the longitudinal direction of said conductive wire, said additional wire is sized to fit into the groove so as to fill entirely the groove;   an insulator placed along the longitudinal direction of the conductive wire covering entirely an outer surface of said conductive wire,   
       wherein:
 the conductive wire and the additional wire are made of different materials, 
 the conductive member is in direct contact with the conductive wire, and 
 a ratio of resistance of the conductive wire at a temperature measured between 50° C. to 200° C. to the resistance of conductive wire measured at 50° C. satisfy the following equation:
   1≤R≤0.028T+0.86
 
 
 wherein T is the temperature at which the resistance of said electric wire is measured. 
 
     
     
       11. The electric wire of claim 10, wherein the conductive wire is made of materials comprising aluminum. 
     
     
       12. The electric wire of claim 10, wherein said conductive member is made of materials comprising copper. 
     
     
       13. The electric wire of claim 10, wherein the insulator is made of a synthetic resin. 
     
     
       14. The electric wire of claim 10, wherein a surface of said conductive member is coated with a conductive material different from material constituting the conductive member. 
     
     
       15. The electric wire of claim 12, wherein the conductive member comprises a silver-plated copper wire. 
     
     
       16. An electric wire comprising:
 a single conductive wire having substantially a quadrilateral cross-sectional shape; and   an insulating layer placed along a longitudinal direction of said single conductive wire, covering at least one corner of said quadrilateral,   
       wherein:
 a thickness of the insulating layer at the corner is thicker than a thickness of the insulating layer at a side of said quadrilateral, and 
 a resistance of the conductive wire at 200° C. is at most 1.42 times larger than a resistance of the conductive wire at 50° C. 
 
     
     
       17. The electric wire of claim 16, wherein the resistance of the conductive wire at 200° C. is at least 1.00 times larger than the resistance of the conductive wire at 50° C. 
     
     
       18. The electric wire of claim 16, wherein a ratio of resistance of the conductive wire measured at a temperature between 50° C. to 200° C. to the resistance of conductive wire measured at 50° C. satisfies the following equation:
   1≤R≤0.028T+0.86
 
 
       wherein T is the temperature at which the resistance of said electric wire is measured. 
     
     
       19. The electric wire of claim 16 further comprising an additional wire inserted in the conductive wire along the longitudinal direction of the conductive wire, 
       wherein:
 the additional wire comprises a conductive member; 
 the conductive wire and the conductive member are made of different materials; and 
 the conductive member is in direct contact with the conductive wire. 
 
     
     
       20. The electric wire of claim 19, wherein the conductive wire is made of materials comprising aluminum and the conductive member is made of materials comprising copper. 
     
     
       21. A coil comprising the electric wire of claim 16, wherein the electric wire being wound on a bobbin so that a corner of a quadrilateral is adjacent to a corner of a next quadrilateral in a cross sectional view. 
     
     
       22. The electric wire of claim 16, wherein the insulating layer covers entirely an outer surface of the conductive wire, covering all corners and all sides of the quadrilateral. 
     
     
       23. The electric wire of claim 16, wherein the insulating layer is made of synthetic resin. 
     
     
       24. The electric wire of claim 16 further comprises a groove disposed along the longitudinal direction of the conductive wire at one corner of the quadrilateral, wherein the insulating layer covers the groove. 
     
     
       25. The electric wire of claim 24, wherein the groove is provided at all corners of the quadrilateral and the insulating layer covers entirely an outer surface of the conductive wire, including all corners and all sides of the quadrilateral.