Rectangular wire, and method of producing the same and electrical equipment using the same

1. A rectangular wire having:

a stacked multilayer conductor member comprising, in a thickness direction, a rectangular metallic conductor that has a layer of a first thermoplastic resin formed on the outer periphery thereof, the first thermoplastic resin being a non-crystalline resin having no melting point or a crystalline resin having an amide bond,

wherein a total number of stacked rectangular metallic conductors in the thickness direction is 6,

wherein the first thermoplastic resin is coated in a thickness of 3 to 4 μm only on one side in a width direction of the rectangular metallic conductor; and

a layer of a second thermoplastic resin having a melting point of 300° C. or more to 450° C. or less only on the outer periphery of the multilayer conductor member,

wherein the second thermoplastic resin has a thickness of 40 to 200 μm; and

the rectangular wire exhibits a high-frequency property having a ratio of current loss that is 0.8 or less at a frequency of 1,000 Hz.

2. The rectangular wire as claimed in claim 1 , wherein the first thermoplastic resin is a resin selected from the group consisting of a polyetherimide, a polyphenylsulfone, a polyethersulfone, a polyamide 66, a polyamide 46, and a polyamide 6.

3. The rectangular wire as claimed in claim 1 , wherein the second thermoplastic resin is a resin selected from the group consisting of a polyaryletherketone, a modified poletheretherketone, and a thermoplastic polyimide.

4. A method of producing a rectangular wire comprising:

a step of forming a multilayer conductor member by stacking, in a thickness direction, a rectangular metallic conductor having formed by bake-coating a layer of a first thermoplastic resin on the outer periphery thereof, the first thermoplastic resin being a non-crystalline resin having no melting point or a crystalline resin having an amide bond,

wherein a total number of stacked rectangular metallic conductors in the thickness direction is 6,

wherein the first thermoplastic resin is coated in a thickness of 3 to 4 μm only on one side in a width direction of the rectangular metallic conductor; and

a step of coating a layer of a second thermoplastic resin having a melting point of 300° C. or more to 450° C. or less only on the outer periphery of the multilayer conductor member,

wherein the second thermoplastic resin has a thickness of 40 to 200 μm; and

the rectangular wire exhibits a high-frequency property having a ratio of current loss that is 0.8 or less at a frequency of 1,000 Hz.

5. An electrical equipment comprising a rectangular wire having:

a stacked multilayer conductor member comprising, in a thickness direction, a rectangular metallic conductor having a layer of a first thermoplastic resin formed on the outer periphery thereof, the first thermoplastic resin being a non-crystalline resin having no melting point or a crystalline resin having an amide bond,

wherein a total number of stacked rectangular metallic conductors in the thickness direction is 6,

wherein the first thermoplastic resin is coated in a thickness of 3 to 4 μm only on one side in a width direction of the rectangular metallic conductor; and

a layer of a second thermoplastic resin having a melting point of 300° C. or more to 450° C. or less only on the outer periphery of the multilayer conductor member,

wherein the second thermoplastic resin has a thickness of 40 to 200 μm; and

the rectangular wire exhibits a high-frequency property having a ratio of current loss that is 0.8 or less at a frequency of 1,000 Hz.