Coil, planar coil and method for making coil
The disclosure relates to a coil, a planar coil, and a method for making a coil. Specifically, according to an embodiment of the disclosure, a coil includes: main coil surfaces which are opposite each other and are substantially planar; and a multilayer film which is wound to form a plurality of loops which are substantially concentric, and the plurality of loops include an innermost loop including a first longitudinal direction end of the coil, and an outermost loop including a second longitudinal direction end of the coil, and the multilayer film includes a plurality of first electro-conductive layers which alternate with each other, and one or more second electrical insulation layer.
1 . A coil comprising:
main coil surfaces which are opposite each other and are substantially planar; and
a multilayer film which is wound to form a plurality of loops which are substantially concentric,
wherein the plurality of loops comprise an innermost loop comprising a first longitudinal direction end of the coil, and an outermost loop comprising a second longitudinal direction end of the coil,
wherein the multilayer film comprises a plurality of first electro-conductive layers which alternate with each other, and one or more second electrical insulation layers,
wherein the first electro-conductive layer and the second electrical insulation layer have a length which is substantially coextensive therebetween along a winding direction of the coil, and have a thickness which is substantially coextensive along a thickness direction of the coil, such that the main coil surfaces, which are substantially planar, comprise corresponding end surfaces of the first electro-conductive layer and the second electrical insulation layer, respectively,
wherein the multilayer film has respective average widths W 1 , W 2 along a first in-plane direction and a second in-plane direction of one or more of the main coil surfaces which are planar,
wherein the multilayer film has average widths W 3 , W 4 along two or more directions which form an angle of 20° to 160° inclusive therebetween, and wherein a width difference between the average widths in the two or more directions belongs to 0% to 10%,
wherein the first in-plane direction and the second in-plane direction have an angle of 90° therebetween,
wherein 11.47≥W 1 /W 2 ≥1.02.
2 . The coil of claim 1 ,
wherein a ratio of the average width W 1 of the multilayer film in the first in-plane direction to the average width W 2 of the multilayer film in the second in-plane direction (W 1 /W 2 ) is 1.02-11.47 inclusive.
3 . The coil of claim 1 ,
wherein the main coil surfaces which are substantially planar form an angle of 0° to 10° inclusive therebetween.
4 . The coil of claim 1 ,
wherein the coil has a parallelogrammic shape when viewed from a side surface.
5 . The coil of claim 1 ,
wherein an angle between the two or more directions is between about 85° and about 95°.
6 . The coil of claim 1 ,
wherein one or more of the one or more second electrical insulation layers are adhesive layers.
7 . The coil of claim 1 ,
wherein at least one of the one or more second electrical insulation layers is a magnetic-conductive layer.
8 . The coil of claim 7 ,
wherein the magnetic-conductive layer comprises one or more of magnetic-conductive ferrite, a magnetic-conductive soft magnet, magnetic-conductive metal, a magnetic-conductive crystalline alloy, a magnetic-conductive nanocrystalline alloy, a magnetic-conductive amorphous alloy, and a magnetic-conductive composite.
9 . The coil of claim 8 ,
wherein the magnetic-conductive ferrite comprises one or more of manganese-zinc ferrite and nickel-zinc ferrite.
10 . The coil of claim 8 ,
wherein the magnetic-conductive metal comprises a magnetic-conductive alloy comprising iron.
11 . The coil of claim 10 ,
wherein the magnetic-conductive alloy further comprises one or more of silicon, aluminum, boron, niobium, copper, cobalt, nickel and molybdenum.
12 . The coil of claim 10 ,
wherein the magnetic-conductive alloy further comprises one or more of silicon, boron, niobium, and copper.
13 . The coil of claim 8 ,
wherein the magnetic-conductive crystalline alloy comprises two or more of iron, cobalt, and nickel.
14 . The coil of claim 8 ,
wherein the magnetic-conductive nanocrystalline alloy comprises iron, silicon, boron, niobium, and copper.
15 . The coil of claim 1 ,
wherein one or more of the one or more second electrical insulation layers comprise an adhesive layer and an electro-magnetic layer disposed on the adhesive layer.
16 . The coil of claim 1 ,
wherein the first electro-conductive layer is magnetically insulative.