Air core coil manufacturing device and air core coil manufacturing method

Abstract

To provide an air core coil manufacturing apparatus and an air core coil manufacturing method that can efficiently manufacture an air core coil having an outer shape with an arc portion as viewed in a winding axis direction and extending in a spiral shape, and an air core coil.SOLUTION: A supply head 112 of an air core coil manufacturing apparatus has an inclined surface 112b on a -Z direction side with respect to a wire guide path 1121a. When a wire F1 conveyed from a roller 131 comes into sliding contact with an inclined surface 112b, an extension direction of the wire F1 is bent in a direction which is inclined from the sliding contact position to a -X direction. A roller drive unit 133 changes a second contact position with respect to a first contact position while the wire F1 is continuously supplied from the supply head 112, thereby forming a spiral coil portion as viewed in the X-axis direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an air-core coil manufacturing apparatus. and Air core coil manufacturing method By law Regarding. [Background technology]

[0002] A winding method for an air-core coil has been proposed in which a plurality of unit coil parts formed by winding a single conductor around a winding axis are arranged in the winding axis direction, each unit coil part is composed of a plurality of unit winding parts having different inner circumferential lengths, at least a portion of each unit coil part is multi-layered by pushing at least a portion of a unit winding part with a smaller inner circumferential length inside a unit winding part with a larger inner circumferential length, and each unit winding part is wound along a loop-shaped winding path having a plurality of arc-shaped corners (see, for example, Patent Document 1). In this winding method for an air-core coil, the conductor is transferred a predetermined distance along a straight transition path that intersects with a shaft body having a cylindrical outer circumferential surface, and while the conductor is aligned with the outer circumferential surface of the shaft body, a pressing member that presses the conductor is rotated along a circumferential path centered on the shaft body, thereby winding the conductor around the outer circumferential surface of the shaft body to form arc-shaped corners, and this process is repeated the number of times equal to the number of corners to form one unit winding part. Then, in the process of forming one unit coil part, the outer diameter of the shaft is changed when forming each unit winding part, thereby forming a plurality of unit winding parts that constitute one unit coil part. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-21041 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the winding method for an air core coil described in Patent Document 1 cannot efficiently produce an air core coil that has an outer shape that has an arc portion when viewed from the winding axis direction and extends in a spiral shape.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and provides an air-core coil manufacturing apparatus capable of efficiently manufacturing an air-core coil that has an outer shape having an arc portion when viewed from the winding axis direction and extends in a spiral shape. and Air core coil manufacturing method Law The purpose is to provide. [Means for solving the problem]

[0006] In order to achieve the above object, an air core coil manufacturing apparatus according to the present invention comprises: a supply head having a wire guide path for guiding the wire in a first direction; a first roller that supports the wire rod in a state of contacting the wire rod from a second direction side perpendicular to the first direction of the wire rod supplied from the supply head; a second roller that contacts the wire rod from a third direction side opposite to the second direction at a position separated from the first roller in the first direction and presses the wire rod toward the second direction, thereby bending the wire rod into an arc shape toward the second direction; a roller driving unit that moves the second roller in a direction perpendicular to a rotation axis of the second roller; a head driving unit that rotates the supply head around a virtual axis that extends from the wire rod guide path in the first direction; Equipped with the supply head is provided with an inclined surface on the second direction side with respect to the wire rod guide path, the inclined surface being inclined so as to protrude in a fourth direction perpendicular to the first direction and the second direction as the wire rod approaches the wire rod guide path, and when the wire rod conveyed from the second roller comes into sliding contact with the inclined surface, the extending direction of the wire rod is bent from a sliding contact position with the inclined surface to a direction inclined toward the fourth direction side, The roller driving unit changes a second contact position between the second roller and the wire relative to a first contact position between the first roller and the wire while the wire is being continuously supplied from the supply head, thereby forming a spiral coil portion as viewed from the fourth direction. death, The head driving unit changes an angle of the supply head in a rotation direction about the virtual axis from a preset reference position, thereby changing an extending direction of the wire from the sliding contact position, and thereby changing a free length of the coil portion in the fourth direction. .

[0007] From another viewpoint, the method for manufacturing an air-core coil according to the present invention comprises: a step of bringing a first roller into contact with the wire from a second direction perpendicular to the first direction of the wire supplied from a supply head having a wire guide path formed therein for guiding the wire in a first direction, and bringing a second roller into contact with the wire from a third direction opposite to the second direction at a position spaced apart from the first roller in the first direction, thereby pressing the wire toward the second direction, thereby bending the wire in an arc shape toward the second direction; a step of bending an extending direction of the wire rod from a sliding contact position with the inclined surface toward the fourth direction by sliding the wire rod conveyed from the second roller against an inclined surface that is inclined so as to protrude in a fourth direction perpendicular to the first direction and the second direction as the wire rod approaches the wire rod guide path provided on the second direction side of the wire rod guide path in the supply head; rotating the supply head about a virtual axis extending from the wire guide path in the first direction; Including, While supplying the wire from the supply head, a second contact position between the second roller and the wire is changed relative to a first contact position between the first roller and the wire, thereby forming a spiral coil portion as viewed from the fourth direction. Along with By changing the angle of the supply head in the rotation direction about the virtual axis from a preset reference position, the extending direction of the wire from the sliding contact position is changed, and the free length of the coil portion in the fourth direction is changed. . Effect of the Invention

[0008] According to the present invention, at a position spaced apart from the first roller in the first direction, the second roller is brought into contact with the wire from a third direction opposite to the second direction and pressed toward the second direction, thereby bending the wire in an arc shape toward the second direction, and the wire conveyed from the second roller is brought into sliding contact with the inclined surface of the supply head, bending the extension direction of the wire in a direction inclined from the sliding contact position toward the fourth direction. Then, by changing the second contact position relative to the first contact position while supplying the wire from the supply head, a coil portion that is spirally shaped as viewed from the fourth direction is formed. This makes it possible to efficiently manufacture an air-core coil that has an outer shape with an arc portion when viewed from the winding axis direction and extends in a spiral shape. [Brief description of the drawings]

[0009] [Figure 1] 1A and 1B show an air core coil manufacturing apparatus according to an embodiment of the present invention, in which (A) is a schematic front view and (B) is a schematic side view of a portion thereof. [Diagram 2] 1A and 1B show a schematic front view and a schematic side view of a portion of an air core coil manufacturing apparatus according to an embodiment of the present invention. [Diagram 3] 1A and 1B show a schematic front view and a schematic side view of a portion of an air core coil manufacturing apparatus according to an embodiment of the present invention. [Figure 4] 1A and 1B show a schematic front view and a schematic side view of a portion of an air core coil manufacturing apparatus according to an embodiment of the present invention. [Diagram 5] 1A and 1B show a schematic front view and a schematic side view of a portion of an air core coil manufacturing apparatus according to an embodiment of the present invention. [Figure 6] 1A and 1B show a schematic side view and a schematic front view of a portion of an air core coil manufacturing apparatus according to an embodiment of the present invention. [Figure 7] 1A is a schematic side view of an example of an air core coil substrate according to an embodiment, and FIG. 1B is a schematic side view of an example of an air core coil according to an embodiment. [Figure 8] 1A and 1B show a schematic side view and a schematic front view of a portion of an air core coil manufacturing apparatus according to an embodiment of the present invention. [Figure 9] 1A and 1B show an air core coil manufacturing apparatus according to an embodiment, in which (A) is a schematic side view of a portion thereof, and (B) is a schematic side view of a portion thereof in another state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an air-core coil manufacturing apparatus according to an embodiment of the present invention will be described with reference to the drawings. The air-core coil manufacturing apparatus according to this embodiment includes a supply head, a first roller, a second roller, and a roller drive unit. The supply head is formed with a wire guide path for guiding the wire in a first direction. The first roller supports the wire in a state of contacting the wire from a second direction side perpendicular to the first direction of the wire supplied from the supply head. The second roller contacts the wire from a third direction side opposite to the second direction at a position separated from the first roller in the first direction and presses the wire toward the second direction, thereby bending the wire in an arc shape toward the second direction. The roller drive unit moves the second roller in a direction perpendicular to the rotation axis of the second roller. The supply head has an inclined surface on the second direction side perpendicular to the first direction with respect to the wire guide path, which is inclined so as to protrude in a fourth direction perpendicular to the first and second directions as it approaches the wire guide path, and when the wire conveyed from the second roller slides against the inclined surface, the extension direction of the wire is bent in a direction inclined toward the fourth direction from the sliding contact position with the inclined surface. The roller drive unit changes the second contact position where the second roller contacts the wire relative to the first contact position where the first roller contacts the wire while the wire is continuously supplied from the supply head, thereby forming a spiral coil portion as viewed from the fourth direction.

[0011] 1(A) and 1(B), the air core coil manufacturing apparatus according to this embodiment includes a wire supplying unit 11, a wire supporting unit 12, a wire bending unit 13, and a coil supporting unit 14. The air core coil manufacturing apparatus also includes a cutting unit (not shown) that cuts the coil portion produced from the wire F1 to produce an air core coil base material that serves as the base of the air core coil, and a recovery unit (not shown) that recovers the air core coil base material.

[0012] The wire supply unit 11 has a supply head 112 and a unit body 111 that supplies the wire F1 to the supply head 112. As shown in FIG. 1B, the supply head 112 has a semi-cylindrical head body 1121 and a semi-cylindrical head support part 1122 that supports the head body 1121 on the +Y direction side. The head body 1121 is formed with a wire guide path 1121a for supplying the wire F1 in the +Y direction. As shown in FIG. 1A, the head body 1121 is provided with inclined surfaces 112b on both sides perpendicular to the Y-axis direction with respect to the wire guide path 1121a, which are inclined so as to protrude in the direction perpendicular to the Y-axis direction as they approach the wire guide path 1121a. Also, on the +Y direction side of the wire guide path 1121a in the head body 1121, a recess 112c is formed in which the wire F1 fed from the wire guide path 1121a is arranged inside. The head support part 1122 is formed with a wire rod supply path 1122a that communicates with the wire rod guide path 1121a of the head main body 1121. The unit main body 111 has a head drive part 1111 that rotates the supply head 112 via the head support part 1122 about a virtual axis VJ1 that extends from the wire rod guide path 1121a in the Y-axis direction, as shown by an arrow AR10 in FIG. 1(A). Here, the unit main body 111 pays out the wire rod F1 through the wire rod supply path 1122a and the wire rod guide path 1121a. The head drive part 1111 can also change the angle of the supply head 112 in the rotation direction about the virtual axis VJ1 from a preset reference position.

[0013] The wire support unit 12 has a roller 121, a roller support part 122 that rotatably supports the roller 121, and an X-axis direction drive part 123 that moves the roller 121 in the X-axis direction. The wire support unit 12 moves the roller 121 to the -Z direction side of the wire guide path 1121a of the supply head 112 when viewed from the Y-axis direction, so that the roller 121 supports the wire F1 supplied from the supply head 112 in a state of contact with the wire F1 from the -Z direction side of the wire F1.

[0014] The wire bending unit 13 includes a roller 131, a roller support section 132 that rotatably supports the roller 131, and a roller drive section 133 that moves the roller 131 in a direction perpendicular to the rotation axis direction of the roller 131. In the wire bending unit 13, the roller drive section 133 contacts the wire F1 from the +Z direction side at a position separated from the roller 121 in the +Y direction, and disposes the roller 131 such that a second contact position between the roller 131 and the wire F1 is located on the -Z direction side compared to a first contact position between the roller 121 and the wire F1 as viewed from the Y axis direction, thereby bending the wire F1 in the -Z direction.

[0015] The coil support unit 14 has a support part driving part 142 that moves the coil support part 141 in the X-axis direction. The coil support unit 14 supports the coil part formed at the tip part of the wire F1 in a state of contacting the coil part from the -X direction side.

[0016] Next, an air-core coil manufacturing method using the air-core coil manufacturing apparatus according to this embodiment will be described. First, as shown in Fig. 2(A), the wire support unit 12 moves the roller 121 to the -Z direction side of the wire guide path 1121a of the supply head 112 when viewed from the Y-axis direction. In this state, the wire supply unit 11 pays out the wire F1 as shown by the arrow AR1 in Fig. 2(B). At this time, the roller 121 rotates as shown by the arrow AR2, and supports the wire F1 in a state of contact with the wire F1 supplied from the supply head 112 from the -Z direction side of the wire F1.

[0017] Next, as shown in Figs. 3(A) and (B), the roller driving section 133 of the wire bending unit 13 places the roller 131 at a position separated from the roller 121 in the +Y direction so as to contact the wire F1 from the +Z direction side. As a result, as shown by an arrow AR3 in Fig. 3(B), the wire F1 is pressed toward the -Z direction side by the roller 131 and bent in an arc toward the -Z direction side. Here, as viewed from the Y-axis direction, the closer the second contact position between the roller 131 and the wire F1 is to the -Z direction side relative to the first contact position between the roller 121 and the wire F1, the smaller the diameter of the coil portion that is generated. Then, when the wire F1 is further unwound from the supply head 112, the tip of the wire F1 comes into contact with the inclined surface 112b of the supply head 112 as shown in Figs. 4(A) and (B).

[0018] 5(A) and 5(B), the wire F1 is further fed from the supply head 112, and when the wire F1 conveyed from the roller 131 comes into sliding contact with the inclined surface 112b of the supply head 112, the extension direction of the wire F1 is bent from a sliding contact position Pos1 where the wire F1 comes into sliding contact with the inclined surface 112b to a direction VL1 inclined toward the -X direction side. Here, a distance W4 in the Y-axis direction between a first contact position Pos21 where the roller 121 comes into contact with the wire F1 and a second contact position Pos22 where the roller 131 comes into contact with the wire F1 is maintained constant. Then, as the wire F1 is continuously supplied from the supply head 112, a coil portion is formed on the -Z direction side of the wire guide path 1121a of the supply head 112. Here, the head driving section 1111 of the wire rod supplying unit 11 changes the angle of the supplying head 112 in the rotation direction around the virtual axis VJ1 from a preset reference posture, thereby changing the extension direction of the wire rod F1 from the sliding contact position Pos1 of the wire rod F1 on the inclined surface 112b, and changing the free length of the coil part in the X-axis direction. In addition, when the roller driving section 133 of the wire rod bending unit 13 moves the roller 131 in the -Z direction so that the distance in the Z-axis direction between the first contact position Pos21 where the roller 121 contacts the wire rod F1 and the second contact position Pos22 where the roller 131 contacts the wire rod F1 becomes a distance W3 longer than the first distance W1 from the preset first distance W1, as shown by the arrow AR5 in Fig. 6(A) while the wire rod F1 is continuously supplied from the supplying head 112, the diameter of the coil part is reduced from the length D[0] to the length D[1], as shown in Fig. 6(B). Then, the roller driving unit 133 moves the roller 131 in the -Z direction so that the distance between the first contact position Pos21 and the second contact position Pos22 where the roller 131 contacts the wire F1 gradually increases from the above-mentioned first distance W1 to a preset second distance W2 that is shorter than the first distance W1. As a result, a spiral coil portion is formed as viewed from the X-axis direction.

[0019] In addition, the roller driving unit 133 moves the roller 131 in the -Z direction so that the distance between the first contact position Pos21 and the second contact position Pos22 gradually increases from the first distance W1 to the second distance W2, and then moves the roller 131 in the +Z direction so that the distance between the first contact position Pos21 and the second contact position Pos22 gradually decreases from the second distance W2 to the first distance W1, thereby forming a coil unit Co1 in which two spiral sub-coil units Co11 and Co12 are arranged side by side along the winding axis direction as shown in Figure 7(A) and have different portions D[0], D[1], D[2], D[3], and D[4] when viewed from the X-axis direction. The number of the sub-coil parts Co11 and Co12 is not limited to two, and the roller driving unit 133 may move the roller 131 so that the distance between the first contact position Pos21 and the second contact position Pos22 gradually increases from the first distance W1 to the second distance W2, and then may move the roller 131 so that the distance gradually decreases from the second distance W2 to the first distance W1, thereby forming a coil part in which three or more sub-coil parts are arranged in parallel in the winding axis direction, or a coil part in which four or more sub-coil parts are arranged in parallel in the winding axis direction. Alternatively, the roller driving unit 133 may move the roller 131 in the -Z direction only once so that the distance between the first contact position Pos21 and the second contact position Pos22 gradually increases from the first distance W1 to the second distance W2, or may move the roller 131 only once so that the distance gradually increases from the second distance W2 to the first distance W1, thereby forming a coil part with only one so-called sub-coil part.

[0020] Thereafter, a cutting unit cuts the produced coil portion Co1 from the wire F1 to produce an air-core coil base material that serves as a base for an air-core coil, and a recovery unit recovers the produced air-core coil base material.

[0021] Next, for the air-core coil base material recovered by the recovery unit, both ends of the air-core coil base material in the winding axis direction are compressed toward each other as shown by arrows AR21 in Fig. 7(B), and in this state the air-core coil base material is fixed with a resin material to generate an air-core coil. Thermosetting resin, thermoplastic resin, ultraviolet curing resin, etc. can be used as the resin material.

[0022] In addition, when the roller driving unit 133 of the wire bending unit 13 moves the roller 131 in the -Y direction so that the distance in the Y axis direction between the first contact position Pos21 where the roller 121 contacts the wire F1 and the second contact position Pos22 where the roller 131 contacts the wire F1 becomes a distance W3 longer than the distance W4 from a preset distance W4 as shown by an arrow AR7 in Fig. 8(A), the diameter of the coil portion is reduced to a length D[5] as shown in Fig. 8(B). That is, when it is desired to greatly change the diameter of the coil portion, the roller driving unit 133 changes the distance between the first contact position and the second contact position in the Y axis direction.

[0023] Furthermore, in the air-core coil manufacturing apparatus according to the present embodiment, the roller driving section 133 of the wire bending unit 13 repeats a state in which the roller 121 is moved in the +Z direction as shown by the arrow AR81 in Fig. 9(A) to separate the roller 121 from the wire F1, and a state in which the roller 121 is moved in the -Z direction as shown by the arrow AR82 in Fig. 9(B) to bring the roller 121 into contact with the wire F1, thereby forming an air-core coil base material including a coil portion having a straight portion and an arc portion. Also, the roller driving section 133 of the wire bending unit 13 raises and lowers the roller 121 in the Z-axis direction while maintaining the roller 121 in contact with the wire F1, thereby forming an air-core coil base material having an elliptical outer diameter as viewed from the X-axis direction.

[0024] As described above, according to the air-core coil manufacturing apparatus of the present embodiment, the roller 131 is brought into contact with the wire F1 from the +Z direction side at a position spaced apart from the roller 121 in the X-axis direction and pressed toward the -Z direction side, thereby bending the wire F1 in an arc shape toward the -Z direction side, and the wire F1 conveyed from the roller 131 is brought into sliding contact with the inclined surface 112b of the supply head 112, thereby bending the extension direction of the wire in a direction inclined toward the -X direction side from the sliding contact position Pos1. Then, while supplying the wire from the supply head 112, the distance between the first contact position Pos21 and the second contact position Pos22 is gradually decreased from the first distance W1 described above to the second distance W2 described above, or gradually increased from the second distance W2 to the first distance W1, thereby forming a coil part Co1 that is spiral-shaped as viewed from the X-axis direction. This makes it possible to efficiently manufacture an air-core coil that has a circular outer shape as viewed from the winding axis direction and extends in a spiral shape.

[0025] Furthermore, with the air core coil manufacturing apparatus according to this embodiment, it is possible to manufacture an air core coil that has a circular outer shape when viewed from the direction of the winding axis and extends in a spiral shape simply by changing the distance between the two rollers 121, 131, so that the air core coil can be manufactured efficiently. Therefore, it is possible to improve the throughput in the production of air core coils.

[0026] Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations of the above-described embodiments. For example, the air-core coil base material collected by the collection unit may be used as a coil spring as it is.

[0027] Although the embodiments and modifications of the present invention have been described above, the present invention is not limited to these. The present invention includes appropriate combinations of the embodiments and modifications, and appropriate modifications thereto. [Industrial Applicability]

[0028] The present invention is suitable for manufacturing air-core coils. [Explanation of symbols]

[0029] 11: wire supply unit, 12: wire support unit, 13: wire bending unit, 14: coil support unit, 111: unit body, 112: supply head, 112b: inclined surface, 112c: recess, 121, 131: roller, 122, 132: roller support section, 123: X-axis direction drive section, 133: roller drive section, 141: coil support section, 142: support section drive section, 1121: head body, 1121a: wire guide path, 1122: head support section, 1122a: wire supply path, 1111: head drive section, Co1: coil section, Co11, Co12: sub-coil section, F1: wire, Pos1: sliding contact position, Pos21: first contact position, Pos22: second contact position, W1: first distance, W2: second distance, VJ1: virtual axis

Claims

1. a supply head having a wire guide path for guiding the wire in a first direction; a first roller that supports the wire rod in a state of contacting the wire rod from a second direction side of the wire rod supplied from the supply head that is perpendicular to the first direction; a second roller that contacts the wire rod from a third direction side opposite to the second direction at a position separated from the first roller in the first direction and presses the wire rod toward the second direction, thereby bending the wire rod into an arc shape toward the second direction; a roller driving unit that moves the second roller in a direction perpendicular to a rotation axis of the second roller; a head driving unit that rotates the supply head around a virtual axis extending from the wire guide path in the first direction, the supply head is provided with an inclined surface on the second direction side with respect to the wire guide path, the inclined surface being inclined so as to protrude in a fourth direction perpendicular to the first direction and the second direction as the wire approaches the wire guide path, and when the wire conveyed from the second roller comes into sliding contact with the inclined surface, the extending direction of the wire is bent from a sliding contact position with the inclined surface to a direction inclined toward the fourth direction, the roller driving unit changes a second contact position between the second roller and the wire relative to a first contact position between the first roller and the wire while the wire is being continuously supplied from the supply head, thereby forming a spiral coil portion as viewed from the fourth direction; the head driving unit changes an angle of the supply head in a rotation direction about the virtual axis from a preset reference posture to change an extending direction of the wire from the sliding contact position, thereby changing a free length of the coil portion in the fourth direction. Air core coil manufacturing equipment.

2. the roller driving unit, while the wire is being continuously supplied from the supply head, moves the second roller such that at least one of the distance in the first direction and the distance in the second direction between the first contact position and the second contact position gradually increases from a preset first distance to a preset second distance shorter than the first distance, or gradually decreases from the second distance to the first distance, thereby forming a spiral coil portion as viewed from the fourth direction.

2. The air core coil manufacturing apparatus according to claim 1.

3. the roller driving unit, while the wire is being continuously supplied from the supply head, moves the second roller so that the distance between the first contact position and the second contact position gradually decreases from the first distance to the second distance, and then repeats the movement of the second roller so that the distance gradually increases from the second distance to the first distance, thereby forming the coil portion in which a spiral sub-coil portion as viewed from the fourth direction is arranged in parallel along the fourth direction.

3. The air-core coil manufacturing apparatus according to claim 2.

4. the roller driving unit moves the second roller so as to alternate between a state in which the second roller is in contact with the wire and a state in which the second roller is separated from the wire while the wire is being continuously supplied from the supply head, thereby forming a coil portion having a straight portion and an arc portion. The air-core coil manufacturing apparatus according to any one of claims 1 to 3.

5. a step of bringing a first roller into contact with the wire from a second direction perpendicular to the first direction of the wire supplied from a supply head having a wire guide path formed therein for guiding the wire in a first direction, and bringing a second roller into contact with the wire from a third direction opposite to the second direction at a position spaced apart from the first roller in the first direction, thereby pressing the wire toward the second direction, thereby bending the wire in an arc shape toward the second direction; a step of bringing the wire rod conveyed from the second roller into sliding contact with an inclined surface that is inclined so as to protrude in a fourth direction perpendicular to the first direction and the second direction as the wire rod approaches the wire rod guide path provided on the second direction side of the wire rod guide path in the supply head, thereby bending the extending direction of the wire rod from a sliding contact position with the inclined surface to a direction inclined toward the fourth direction; and rotating the supply head about a virtual axis extending from the wire guide path in the first direction, While supplying the wire from the supply head, a second contact position between the second roller and the wire is changed relative to a first contact position between the first roller and the wire, thereby forming a spiral coil portion as viewed from the fourth direction, changing an angle of the supply head in a rotation direction around the virtual axis from a preset reference position to change an extending direction of the wire from the sliding contact position, thereby changing a free length of the coil portion in the fourth direction. Air core coil manufacturing method.

6. a step of producing a coil base material that is a base of an air-core coil by cutting off the coil portion from the wire; and compressing both ends of the coil base material in a winding axis direction of the coil base material toward each other, and fixing the coil base material with a resin material to generate the air-core coil. The method for manufacturing an air-core coil according to claim 5.

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