Insulated wire, motor coil, and electrical or electronic equipment
An insulated wire, having at least one thermosetting resin layer and at least one thermoplastic resin layer in this order, as covering layers, on a conductor having a quadrilateral cross-section, wherein, in a coating thickness of the covering layers, in each side to be formed on 4 sides of the quadrilateral cross-section of said insulated wire, a difference between the maximum value and the minimum value is each 20 μm or less, and a value of the maximum value divided by the minimum value of the whole sides is 1.3 or more; a motor coil; and an electrical or electronic equipment.
1. An insulated wire, comprising at least one thermosetting resin layer and at least one thermoplastic resin layer in this order, as covering layers, on a conductor having a quadrilateral cross-section,
wherein, in each of 4 covering layer portions corresponding to 4 sides of the cross-section of said insulated wire, a difference between the maximum value and the minimum value of a coating thickness is each 20 μm or less, and in the whole of the above 4 covering layer portions, a value of the maximum value divided by the minimum value of the coating thickness is 1.3 or more.
2. The insulated wire as claimed in claim 1 , wherein, in each of the 4 covering layer portions, an average coating thickness of the thermosetting resin layer is 5 μm or more.
3. The insulated wire as claimed in claim 1 , wherein the covering layer portion giving the maximum value of the coating thickness in the whole of the above 4 covering layer portions, and the covering layer portion giving the minimum value of the coating thickness in the whole of the above 4 covering layer portions, lie next to each other.
4. The insulated wire as claimed in claim 1 , wherein, in the cross-section of the insulated wire, an average of the maximum value and the minimum value of the coating thickness of a pair of the covering layer portions corresponding to long sides facing each other is thinner than an average of the maximum value and the minimum value of the coating thickness of a pair of the covering layer portions corresponding to short sides facing each other.
5. The insulated wire as claimed in claim 1 , wherein a thermosetting resin which constitutes the thermosetting resin layer is selected from the group consisting of polyamideimide and polyimide.
6. The insulated wire as claimed in claim 1 , wherein a tensile elastic modulus at 25° C. of a thermosetting resin which constitutes the thermosetting resin layer is 2,000 MPa or more.
7. The insulated wire as claimed in claim 1 , wherein a thermoplastic to resin which constitutes the thermoplastic resin layer comprises polyetheretherketone or polyphenylenesulfide.
8. A motor coil comprising a lamination of more than one of the insulated wires as claimed in claim 1 .
9. An electrical or electronic equipment, comprising a built-in laminated body of more than one of the insulated wires as claimed in claim 1 .