JP6056100B2 - Spiral coil - Google Patents

Description

  The present invention relates to an air-core coil that can be applied to a power transmission coil and a power reception coil of a power transmission device that transmits non-contact power mainly by electromagnetic induction generated between opposing coils, and in particular, a flat wire in which the coil wire is a stranded wire. The present invention relates to a flat spiral coil that is wound in a close-contact spiral shape.

  As a charger that charges the battery built into cordless devices (for example, mobile phones, electric razors, desk cleaners, remote controllers, watches, calculators, etc.), the primary coil built into the charger and the secondary built into the cordless device A contactless rechargeable device in which a coil is magnetically coupled is known.

  In this type of contactless rechargeable device, power is supplied from the charger to the cordless device by electromagnetic induction from the primary coil to the secondary coil without providing a contact point for electrically connecting the charger and the cordless device. Can do. When an alternating current is passed through the power transmission coil from the power transmission control circuit of the charger, an electromotive force is induced in the power receiving coil of the cordless device due to mutual induction, and the current due to the electromotive force flows to the power reception control circuit of the cordless device to transmit power. Is done. The power transmission coil or the power reception coil is formed by winding a conductor in a spiral shape.

  Patent Document 1 describes a planar spiral air-core coil in which a primary coil and a secondary coil that constitute a contact-type transformer are composed of a single conductor.

  Patent Document 2 describes a spiral coil manufactured by winding a wire having a circular or rectangular cross-sectional shape into a spiral shape.

  Patent Document 3 shows an air-core coil obtained by winding a single-conductor wire with an insulating coating in a flat air-core single-layer spiral shape so that adjacent conductors are in close contact with each other (FIG. 1). Further, there is shown an air core coil with an insulating material in which this air core coil is disposed on an insulating plate and an insulating resin is applied onto a single conductor of the air core coil (FIG. 20), and a plurality of bare single coils are shown. There is a description of an air-core coil formed by winding a conducting wire (for example, a litz wire obtained by twisting seven formal wires) into a single layer spiral shape.

  Patent Document 4 shows a planar coil in which an electric wire made of a stranded wire is spirally wound in the same plane.

Japanese Patent Laid-Open No. 04-122007 JP 11-97263 A JP 2007-324532 A JP 2008-172873 A

  FIG. 8 corresponds to FIG. 1 of Patent Document 3, and is formed by winding a conductor having an insulation coating on a single conductor having a circular cross section into a flat plate air-core single layer spiral so that adjacent conductors are in close contact with each other. 3 is a schematic longitudinal sectional view showing a method for manufacturing the air-core spiral single layer coil 4. FIG. In FIG. 8, reference numeral 1 is a core for winding a conducting wire, reference numeral 2 is a flange integral with the core 1, and reference numeral 3 is a space defining flange that cooperates with the flange 2 to define a winding space.

  A small hole (not shown) in which a winding start end of a conducting wire (Litz wire) formed by twisting seven strands covered with an insulating coating on a single conducting wire having a circular cross section and covered with a self-bonding layer is provided in the flange 2 , The flange 3 is brought into contact with the end face of the core 1 to define a winding space, and the flanges 2 and 3 are rotated integrally to wind the conductive wire (Litz wire) tightly around the core 1; The winding end is fixed so as not to be loosened, heated to a required temperature, and then cooled to be integrated as an air core spiral single layer coil 4 by a self-bonding layer, and then air core spiral single layer coil 4 is removed from the core 1 and the flanges 2 and 3.

  As shown in FIG. 9, the air-core spiral single-layer coil 4 that is separated and removed from the flange 3 cannot maintain a flat surface, and is innermost as it goes radially outward from the innermost peripheral portion. A warp gradually deviates from the plane Y passing through the center of the cross section of the peripheral litz wire. This is based on the fact that the coil itself is deformed by stranded stress. Accordingly, as shown in FIG. 20 of Patent Document 3, an air-core spiral single layer coil 4 is disposed on an insulating plate, and an insulating resin is applied thereon to form an air-core coil with an insulating material. It is necessary to hold down.

  The present invention has been devised in view of the above points, and provides a spiral coil in which the coil itself does not warp without taking measures such as placing it on an insulating plate and fixing it with an insulating resin to suppress warping. The purpose is to do.

  In order to achieve the above object, the spiral coil of the present invention has the following three modes.

  The spiral coil according to the first aspect of the present invention has a spiral shape in which a plurality of twisted wires having different twist directions are wound on the same axis and adjacent twisted wires are in close contact with each other.

In this spiral coil, one or two or more S stranded wires and one or two or more Z stranded wires are wound in a planar spiral shape without gaps in an alternating arrangement in the radial direction, and are in contact with each other. The first embodiment is a single-layer air-core coil in which a wire and a Z-stranded wire are integrated, one S-stranded wire, the number of strands and the cross-sectional area are the number of strands and the cross-sectional area of an S-stranded wire One or more Z stranded wires that are identical to each other are drawn out in parallel, and the S stranded wire and the Z stranded wire are wound in the same phase in a spiral shape without gaps, and the S stranded wires that are in contact with each other 2nd form which is a multi-layer air core coil formed by integrating each other, Z stranded wires, and an integrated S stranded wire and a Z stranded wire.
Further, in both the first and second embodiments, the inner peripheral side extraction wires of the S stranded wire and the Z stranded wire are combined into one lead, and the outer peripheral side extraction of the S stranded wire and the Z stranded wire is taken. The wire is combined into a single lead, and the winding start end and winding end of one of the S stranded wire and Z stranded wire are the lead wires, and the other winding start end and winding end end are Including a configuration in which the lead is insulated and current cannot be supplied.
The integration of the stranded wires is achieved by pressing using a self-welding wire and heating to a high temperature, laminating and cooling, or by suppressing the extension in the deformation direction by pressing and high-pressure pressing in the laminating direction. Achieved.
Here, “self-bonding wire” refers to a wire in which a copper wire is covered with an insulating film and the insulating film is covered with a self-bonding layer. For non-contact power transmission coils, high-efficiency winding technology is required which is used at a high frequency and is thin and has a high line area ratio. In the present invention, by using a stranded wire, the resonance frequency of the coil is increased, and use at a high frequency is possible.

  The spiral coil according to the second aspect of the present invention is characterized in that a plurality of spiral coils made of twisted wires having different twist directions are stacked in the axial direction and integrated into a plurality of layers.

In this spiral coil, one or two or more S strands are spirally wound on the same plane without gaps, and S strands that are in contact with each other are integrated with each other. Alternatively, two or more Z stranded wires are wound spirally on the same plane without gaps, and Z stranded wire spiral coils formed by integrating Z stranded wires that are in contact with each other are separately formed, and S stranded wire It includes a third mode in which spiral planes of a spiral coil and a Z stranded spiral coil are overlapped and integrated into a plurality of layers.
Further, in the third embodiment, as in the first and second embodiments described above, the S-strand wire and the Z-strand lead wire are combined into a single lead and the S-strand wire. And the Z-stranded outer peripheral side lead-out wires are combined into one lead, and either the S-stranded wire or the Z-stranded wire, the winding start end and the winding end end are lead wires, and the other, It includes a form in which the winding start end and the winding end end are insulated from the lead and cannot be energized.
The integral lamination of the S stranded wire spiral coil and the Z stranded wire spiral coil is achieved by laminating and pressing self-welding wires, heating to high temperature, and cooling.

  The planar spiral air core coil according to the third aspect of the present invention has a configuration in which the twist pitches of the plurality of twisted wires having different twist directions are different from each other in the first or second aspect.

  In this plane spiral type air-core coil, for example, the S strand is twisted at a standard twist pitch of about 30 times the diameter of the strand assembly, while the Z strand has a twist pitch of the strand assembly. It is a form in which the spiral coils of the first to third forms are formed by using the S-stranded wire and the Z-twisted wire loosely twisted at about 40 times the diameter.

According to the present invention, the twist of the twisted wire direction (S twisted wire and Z twisted wire) is wound to form a spiral coil, thereby canceling the warp of the S twisted wire and the warp of the Z twisted wire. Therefore, it is possible to provide a spiral coil that does not warp.
In addition, when a spiral coil is formed by winding stranded wires having different stranded wire pitches (S stranded wire and Z stranded wire), the overlapping state of the stranded wires can be controlled in addition to no warping. In addition, since the line area ratio can be increased, it is possible to provide a planar spiral air core coil for non-contact power transmission with high efficiency.

FIG. 1 (a) is a front view of the planar spiral air core coil according to the first embodiment of the present invention, and FIG. 2 (b) is an Ib-Ib enlarged sectional view of FIG. Fig. (A) is a front view of a planar spiral air core coil according to the second embodiment of the present invention, and Fig. (B) is an enlarged sectional view taken along line IIb-IIb in Fig. (A). FIG. 5A is a front view of a planar spiral air core coil according to the third embodiment of the present invention, and FIG. 5B is an enlarged sectional view taken along line IIIb-IIIb in FIG. Fig. (A) is a front view of a planar spiral air core coil according to the fourth embodiment of the present invention, and Fig. (B) is an enlarged sectional view taken along line IVb-IVb in Fig. (A). FIG. 5A is a perspective view of a planar spiral air core coil according to the fifth embodiment of the present invention, and FIG. 5B is an enlarged cross-sectional view taken along line Vb-Vb in FIG. FIG. 5A is a perspective view of a planar spiral air core coil according to the sixth embodiment of the present invention, and FIG. 5B is an enlarged sectional view taken along line VIb-VIb in FIG. FIG. 5A is a perspective view of a planar spiral air core coil according to the seventh embodiment of the present invention, and FIG. 5B is an enlarged sectional view taken along line VIIb-VIIb in FIG. It is a typical longitudinal section showing the manufacturing method of the conventional air core spiral single layer coil. It is a figure which shows the curvature after manufacture of the air-core spiral type single layer coil taken out from the coil manufacturing apparatus of FIG.

  Hereinafter, embodiments of a planar spiral air core coil according to the present invention will be described with reference to the drawings.

[First Embodiment]
Fig.1 (a) is a front view of the planar spiral type air-core coil 10 concerning this embodiment, FIG.1 (b) shows the Ib-Ib expanded sectional view in Fig.1 (a). In this plane spiral type air-core coil 10, one S strand 11 and one Z strand 12 are alternately arranged in the radial direction, wound in a plane spiral shape without a gap, and contact each other. This is a single-layer air-core coil in which a stranded wire 11 and a Z stranded wire 12 are integrated. The inner peripheral side lead wires 11a and 12a of the S stranded wire 11 and the Z stranded wire 12 are combined into one lead, and the outer peripheral side lead wires 11b and 12b of the S stranded wire 11 and the Z stranded wire 12 are one. It is summarized as a lead. The arrangement of the S stranded wire 11 and the Z stranded wire 12 may be reversed.

  Each of the S stranded wire 11 and the Z stranded wire 12 is a collective wire in which a plurality of self-bonding wires are S stranded or Z stranded, or a plurality of bare conductors (copper wires) are S stranded or Z stranded. The assembly line is then covered with an insulating film and further covered with a self-welding layer. The S stranded wire 11 and the Z stranded wire 12 are standard pitches having the same number of self-bonding wires and the same twist pitch (about 30 times the diameter of the stranded wire assembly). Such a twisted-ply stranded wire has a substantially circular shape, with the cross-sectional shape hardly deformed by the winding. The S stranded wire 11 and the Z stranded wire 12 are not limited to litz wires.

  In order to manufacture the planar spiral type air-core coil 10, the winding means similar to the core 1 and the flanges 2 and 3 shown in FIG. That is, after passing the winding start ends of the S stranded wire 11 and the Z stranded wire 12 through a small hole (not shown) provided in the flange 2, the flange 3 is brought into contact with the end surface of the core 1 to define a winding space, and the flange By rotating 2 and 3 together, the S stranded wire 11 and the Z stranded wire 12 are wound around the core 1 in an alternating arrangement without gaps, and the winding end is fixed so as not to loosen, and the required temperature is reached. By heating and then cooling, the air core spiral single layer coil 4 is integrated by the self-bonding layer, and then removed. As a heating method, in addition to an appropriate heating means, an electric fusion that is fused by using heat generated by energizing a coil may be used. In that case, after the winding, the terminal wire is fixed and heated while energized, cooled, and the coil is removed. Other fusion methods include hot air winding in which hot air is blown and fused to the winding portion while winding rather than heating after winding, or winding and melting while applying alcohol to the fusion layer. Alcohol fusion to be applied can also be used.

  According to this embodiment, the warp of the S stranded wire and the warp of the Z stranded wire can be offset, and no warp occurs.

  Note that the winding start end and winding end end of the S stranded wire 11 are lead wires, and the winding start end and winding end end of the Z stranded wire 12 are cut off from the base so as to be non-conductive to the lead wire of the S stranded wire 11. (Also in other embodiments). In this configuration, only the S stranded wire 11 is used as a coil, and the Z stranded wire 12 serves to cancel the warp of the S stranded wire.

[Second Embodiment]
2A is a front view of the planar spiral air-core coil 13 according to this embodiment, and FIG. 2B is an enlarged sectional view taken along line IIb-IIb in FIG. In this plane spiral type air-core coil 13, one S strand 14 and one Z strand 15 are wound in a plane spiral shape without any gaps alternately arranged in the radial direction, and are in contact with each other. The wire 14 and the Z stranded wire 15 are integrated, the inner periphery side lead wires 14a and 15a of the S stranded wire 14 and the Z stranded wire 15 are combined into one lead, and the S stranded wire 14 and the Z stranded wire 15 This is a single-layer air-core coil in which the outer peripheral lead wires 14b and 15b are combined into one lead.

  The planar spiral air core coil 13 has the same number of self-bonding wires as the planar spiral air core coil 10 of the first embodiment, but the twist pitch of the S stranded wire 14 and the Z stranded wire 15 is twisted. It differs in that it is 40 times or more the wire diameter of the wire assembly. More specifically, in this embodiment, the wire is a twisted wire assembly (twisted diameter 0.3 mm) with seven twisted wires having a wire diameter of 0.1 mm and a twisted wire pitch of 20 mm, and the twisted wire pitch is the twisted diameter. It is 67 times. The stranded wire having such a twist pitch cannot maintain the cross-sectional shape due to the winding, and enters the gap of the winding jig to determine the shape, so that it becomes a square, a triangle, an oval shape or the like according to the gap shape. That is, this flat spiral air core coil 13 uses loosely twisted S stranded wire 14 and Z stranded wire 15 compared to the flat spiral air core coil 10 of the first embodiment, and tightly fits on the same plane. As shown in FIG. 2 (b), the original cross-sectional shape of the stranded wire is distorted and has a substantially rectangular shape. About this plane spiral type air-core coil 13, since the other structure is the same as 1st Embodiment, description is abbreviate | omitted.

  In the plane spiral air core coil 13 according to this embodiment, the warp of the S stranded wire 14 and the warp of the Z stranded wire 15 are offset, and in addition to causing no overall warpage, the overlapping state of the stranded wire assemblies Since the space factor (linear product area) can be increased, the inductance value can be increased, and a highly efficient planar spiral air core coil for non-contact power transmission can be provided.

[Third Embodiment]
3A is a front view of the planar spiral air core coil 16 according to this embodiment, and FIG. 3B is an enlarged sectional view taken along line IIIb-IIIb in FIG. In this plane spiral type air-core coil 16, one S strand 17 and one Z strand 18 are wound in a plane spiral shape with no gaps alternately arranged in the radial direction, and are in contact with each other. The wire 17 and the Z stranded wire 18 are integrated, the inner peripheral side extraction wires 17a and 18a of the S stranded wire 17 and the Z stranded wire 18 are combined into one lead, and the S stranded wire 17 and the Z stranded wire 18 are combined. These are single-layer air-core coils in which the outer peripheral lead wires 17b and 18b are combined into one lead.

  The planar spiral air-core coil 16 is the first in that the twist pitch of the S strand 17 is a standard pitch, while the twist pitch of the Z strand 18 is about 40 times or more the diameter of the strand assembly. This is different from the planar spiral air core coil 10 of the embodiment. That is, the plane spiral type air-core coil 16 uses an S strand 17 twisted at a standard pitch and a Z strand 18 loosely twisted, and is tightly wound on the same plane. As shown in (b), the original cross-sectional shape of the Z stranded wire 18 is collapsed, and the shape is constricted in the middle. The Z stranded wire 18 may be twisted at a standard pitch, and the S stranded wire 17 may be loosely twisted. About this plane spiral type air-core coil 13, since the other structure is the same as 1st Embodiment, description is abbreviate | omitted.

  In this plane spiral air core coil 16, the warp of the S stranded wire 17 and the warp of the Z stranded wire 18 are canceled out, and in addition to not generating the warp as a whole, the overlapping state of the stranded wire assembly can be controlled, Since the space factor can be increased, the inductance value can be increased, and a highly efficient planar spiral air core coil for non-contact power transmission can be provided.

[Fourth Embodiment]
FIG. 4A is a front view of the planar spiral air core coil 19 according to this embodiment, and FIG. 4B is an enlarged cross-sectional view of IVb-IVb in FIG. In this plane spiral type air-core coil 19, one S strand 20 and two parallel Z strands 21 are wound in a plane spiral shape without any gaps alternately arranged in the radial direction, and contact each other. The stranded wire 20 and the Z stranded wire 21 are integrated, the inner peripheral side take-out wires 20a and 21a of the S stranded wire 20 and the Z stranded wire 21 are combined into one lead, and the S stranded wire 20 and the Z stranded wire. 21 is a single-layer air-core coil in which outer peripheral side lead wires 20b and 21b are combined into a single lead.

  In this plane spiral type air-core coil 19, the S stranded wire 20 is made of, for example, seven self-bonding wires, and the stranded pitch is a standard pitch, while the Z stranded wire 21 is made of, for example, four self-bonding wires. The twist pitch is the standard pitch. In other words, the plane spiral air core coil 19 uses one S stranded wire 20 twisted at a standard pitch and two Z stranded wires 21 having a standard pitch but a small number of self-bonding wires. Since each of the stranded wires is wound, the cross-sectional shape is not deformed, but the gap between the two Z stranded wires 18 entering the gap between the S stranded wires 20 as shown in FIG. Fill. Since the other configuration of the planar spiral air core coil 19 is the same as that of the first embodiment, description thereof is omitted.

  In this plane spiral air core coil 19, the warp of the S stranded wire 20 and the warp of the Z stranded wire 21 are canceled out, and in addition to not generating the warp as a whole, the overlapping state of the stranded wire assembly can be controlled, Since the space factor can be increased, the inductance value can be increased, and a highly efficient planar spiral air core coil for non-contact power transmission can be provided.

[Fifth Embodiment]
5A is a perspective view of the planar spiral air core coil 22 according to this embodiment, and FIG. 5B is an enlarged cross-sectional view of Vb-Vb in FIG. 5A. In this plane spiral air core coil 22, one (or a plurality of) S stranded wires 23 and one (or a plurality of) Z stranded wires 24 are in close contact with an inclined surface having a substantially right triangle. Thus, it is integrated. The inner stranded lead wires 23a and 24a of the S stranded wire 23 and the Z stranded wire 24 are combined into a single lead, and the outer peripheral extracted wires 23b and 24b are combined into a single lead.

  In this planar spiral air core coil 22, the S stranded wire 23 and the Z stranded wire 24 are composed of, for example, seven self-bonding wires, and the twist pitch is about 40 times or more the diameter of the stranded wire assembly. In other words, this flat spiral air core coil 28 uses one loosely twisted S stranded wire 23 and one Z stranded wire 24. The S stranded wire 23 is closer to the flange 2 and one Z stranded wire. By winding 24 tightly toward the flange 3, the cross-sectional shape of the stranded wire is deformed into a substantially right triangle as shown in FIG. Since the other configuration of the planar spiral air core coil 22 is the same as that of the first embodiment, description thereof is omitted.

  In manufacturing the planar spiral type air-core coil 22, the length of the bus bar of the core 1 is set to, for example, 1. The distance between the flanges 2 and 3 is regulated by 5 times, and the S stranded wire 22 and the Z stranded wire 23 made of self-bonding wires are moved closer to the flange 2 and one Z stranded wire 24 is moved toward the flange 2. A flat spiral air-core coil is formed by placing it close to the flange 3 and winding it tightly in a spiral shape with a time difference, and it is integrated by heating and cooling.

  In this plane spiral air core coil 22, the warp of the S stranded wire 23 and the warp of the Z stranded wire 24 cancel each other, and in addition to the fact that no warp occurs as a whole, the overlapping state of the stranded wire assembly can be controlled. Since the space factor can be increased, the inductance value can be increased, and a highly efficient planar spiral air core coil for non-contact power transmission can be provided.

[Sixth Embodiment (Second Aspect)]
6A is a perspective view of the planar spiral air core coil 25 according to this embodiment, and FIG. 6B is an enlarged cross-sectional view taken along VIb-VIb in FIG. 6A. In this planar spiral air core coil 25, one (or a plurality of) S stranded wires 26 and one (or a plurality of) Z stranded wires 27 are aligned in the axial direction and have a planar spiral shape without any gaps. A plane spiral single-layer air-core coil made of S-stranded wire 26 and a plane spiral-type single-layer air-core coil made of Z-stranded wire 27 are wound on each other to form a plurality of layers (in this example, 2 layers). The inner peripheral side lead wires 26a and 27a of the S stranded wire 26 and the Z stranded wire 27 are combined into one lead, and the outer peripheral side lead wires 26b and 27b are combined into one lead. The arrangement of the S stranded wire 26 and the Z stranded wire 27 may be reversed.

  Each of the S stranded wire 26 and the Z stranded wire 27 is an aggregated wire in which a plurality of self-bonding wires are S stranded or Z stranded, or a plurality of bare conductors (copper wires) are S stranded or Z stranded. It is an assembly wire that is twisted and then covered with an insulating coating and further covered with a self-welding layer. The S stranded wire 26 and the Z stranded wire 27 are standard pitches having the same number of self-bonding wires and the same twist pitch. The S stranded wire 26 and the Z stranded wire 27 are not limited to litz wires.

The planar spiral air core coil 25 can be manufactured by two methods.
One manufacturing method uses the same winding means as the core 1 and the flanges 2 and 3 shown in FIG. 8, and the length of the bus bar of the core 1 is twice the diameter of the twisted wire assembly between the flanges 2 and 3. The spacing is regulated, and the S stranded wire 26 and the Z stranded wire 27 made of self-bonding wires are juxtaposed in the axial direction and simultaneously wound into a spiral shape to form a plane spiral multi-layer air core coil, and heated and cooled. Manufacturing method.

  Another manufacturing method uses the same winding means as the core 1 and the flanges 2 and 3 shown in FIG. 8, and the length of the bus bar of the core 1 is made equal to the diameter of the twisted wire assembly so The S-strand wire 26 made of a self-bonding wire is spirally wound, and is heated and cooled to be integrated to form a plane spiral single-layer air-core coil. The Z stranded wire 27 is spirally wound, heated and cooled to be integrated to form a flat spiral single layer air core coil, and the S spiral wire 26 of the flat spiral single layer air core coil and the Z stranded wire This is a manufacturing method in which 27 plane spiral single-layer air-core coils are superposed and pressed so as to hold a two-layer plane, and then heated and cooled to be integrated.

  According to this embodiment, since the warp of the S stranded wire and the warp of the Z stranded wire can be offset, it is possible to provide a planar spiral air core coil in which no warp occurs.

[Seventh Embodiment]
Fig.7 (a) is a perspective view of the planar spiral type air-core coil 28 concerning this embodiment, FIG.7 (b) shows the VIIb-VIIb expanded sectional view in Fig.7 (a). In this plane spiral type air-core coil 28, one (or a plurality of) S stranded wires 29 and one (or a plurality of) Z stranded wires 30 are arranged in the axial direction and wound in a plane spiral shape without a gap. That is, a plane spiral single-layer air core coil made of S-stranded wire 29 and a plane spiral single-layer air-core coil made of Z-twisted wire 30 are stacked in a plurality of layers (in this example, 2 layers). Layer). The inner peripheral lead wires 29a and 30a of the S stranded wire 29 and the Z stranded wire 30 are combined into one lead, and the outer peripheral lead wires 29b and 30b are combined into one lead.

  In this plane spiral type air-core coil 28, the S stranded wire 29 and the Z stranded wire 30 are composed of, for example, seven self-bonding wires, and the twist pitch is about 40 times or more the diameter of the stranded wire assembly. That is, this flat spiral air-core coil 28 uses one loosely twisted S stranded wire 29 and one Z stranded wire 30 and is tightly wound, so that FIG. As shown, the cross-sectional shape of the stranded wire is deformed into a substantially rectangular shape. Since the other configuration of the plane spiral air core coil 28 is the same as that of the sixth embodiment, the description thereof is omitted. The manufacturing method is also the same as in the sixth embodiment.

  The plane spiral air-core coil 28 cancels out the warp of the S stranded wire 29 and the warp of the Z stranded wire 30 and does not cause a warp as a whole, and can control the overlapping state of the stranded wire assembly, Since the space factor can be increased, the inductance value can be increased, and a highly efficient planar spiral air core coil for non-contact power transmission can be provided.

  The present invention is not limited to the above-described embodiment, and various technically modified forms are included in the technical scope grasped based on the description of the scope of claims without departing from the gist of the invention. included. For example, a coil wound around a bobbin or a cored coil may be used. According to the present invention, it is possible to provide an electromagnetic induction type and electromagnetic resonance type planar spiral type air core coil, which can be used as, for example, a planar spiral type air core coil antenna for an IC tag.

DESCRIPTION OF SYMBOLS 10 Planar spiral type air-core coil 11 S strand wire 12 Z strand wire 11a, 12a Inner periphery side extraction wire 11b, 12b Outer periphery side extraction wire 13 Planar spiral type air core coil 14 S strand wire 15 Z strand wire 14a, 15a Inner circumference Side lead-out wires 14b, 15b Outer peripheral side lead-out wire 16 Flat spiral air core coil 17 S twisted wire 18 Z twisted wires 17a, 18a Inner peripheral side lead out wires 17b, 18b Outer peripheral side lead-out wire 19 Planar spiral air core coil 20 S twist Wire 21 Z stranded wire 20a, 21a Inner peripheral lead wire 20b, 21b Outer peripheral lead wire 22 Planar spiral air core coil 23 S stranded wire 24 Z stranded wire 23a, 24a Inner peripheral lead wire 23b, 24b Outer peripheral lead wire 25 Planar spiral type air-core coil 26 S stranded wire 27 Z stranded wire 26a, 27a Inner peripheral side extraction wires 26b, 27b Outer peripheral side extraction 28 flat spiral air core coil 29 S twisted 30 Z strands 29a, 30a in the peripheral side retrieving lines 29 b, 30b outer peripheral side retrieving lines

Claims (3)

A coil in which a plurality of twisted wires having different twist directions are wound on the same axis, and the twisted wire has a twist pitch of 40 times or more of the wire diameter of the twisted wire assembly, and its cross-sectional shape is caused by winding. A spiral coil that is deformed and has a spiral shape in which adjacent twisted wires are in close contact with each other. The spiral coil according to claim 1, wherein a plurality of spiral coils made of stranded wires having different twist directions are stacked in the axial direction and integrated into a plurality of layers. The spiral coil according to claim 1 or 2, wherein a plurality of twisted wires having different twist directions have different twist pitches.

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