Assembled wire, segmented conductor, and segment coil and motor using the same
Provided is an assembled wire 10 having a substantially rectangular cross section, and is formed by assembling a plurality of strands 7 . Each strand 7 has a conductor portion 11 and a strand insulating layer 13 covering the conductor portion 11 . The strand insulating layer 13 preferably contains at least one kind of resin in which 50% weight loss in Tg-DTA occurs at from 300° C. to 500° C. The strand insulating layer 13 contains particles. The particles are particles having volume resistivity of 1×10 6 Ω·cm or more, and, for example, inorganic substances such as silica, titania, alumina, aluminum nitride, magnesium oxide, silicon nitride, and silicon carbide; and resins such as silicone are applicable.
1. An assembled wire in which a plurality of strands are assembled, wherein:
each strand comprises a conductor portion and a strand insulating layer that coats the conductor portion;
the strand insulating layer comprises particles having volume resistivity of 1×10 6 Ω·cm or more;
at least a part of the assembled plurality of strands in a longitudinal direction is covered with a thermoplastic resin directly or indirectly via another insulating layer; and
the thermoplastic resin is a crystalline resin, and has a flexural strength at 23° C. of 2000 MPa or more.
2. The assembled wire according to claim 1 , wherein an average particle diameter of the particles is 0.1 to 10 μm.
3. The assembled wire according to claim 1 , wherein the particles comprise silica, titania, alumina, aluminum nitride, magnesium oxide, silicon nitride, silicon carbide or polyimide silicone.
4. The assembled wire according to claim 1 , wherein the strand insulating layer comprises polyamide, polyurethane, epoxy, polyester, nylon, or polyethylene terephthalate.
5. The assembled wire according to claim 1 , wherein an addition amount of the particles is 5 to 60 volume % with respect to a resin constituting the strand insulating layer.
6. The assembled wire according to claim 1 , wherein the strand insulating layer includes at least one kind of resin in which 50% weight loss in Tg-DTA occurs at from 300° C. to 500° C.
7. The assembled wire according to claim 1 , wherein a thickness of the strand insulating layer is 0.5 to 30 μm.
8. The assembled wire according to claim 1 , wherein the plurality of the strands are twisted to one another.
9. The assembled wire according to claim 1 , wherein the thermoplastic resin is polyetheretherketone, modified polyetheretherketone, polyetherketoneketone, polyetherketone, polyetherketoneetherketoneketone, polyphenylene sulfide, or thermoplastic polyimide.
10. A segmented conductor, wherein the assembled wire according to claim 1 is cut into short lengths, and on at least both end portions of the assembled wire, the thermoplastic resin is not formed and each of the strands is exposed.
11. The segmented conductor according to claim 10 , which is formed as one body in its longitudinal direction without joint portions that connect between the conductor portions.
12. A segment coil comprising the assembled wire according to claim 1 .
13. A motor comprising the assembled wire according to claim 1 .