WO2016199893A1

WO2016199893A1 - Air core coil wire winding tool and air core coil production method

Info

Publication number: WO2016199893A1
Application number: PCT/JP2016/067375
Authority: WO
Inventors: 麻美松谷; 誠史大久保; 真紀岡田
Original assignee: 三菱電機株式会社
Priority date: 2015-06-12
Filing date: 2016-06-10
Publication date: 2016-12-15
Also published as: KR102051278B1; KR20180002787A; CN107735844A; JPWO2016199893A1; JP6377273B2; CN107735844B

Abstract

The purpose of the present invention is to allow a coil to be removed readily from an air core coil wire winding tool when producing an air core coil. This air core coil wire winding tool has a winding core which is configured by bringing into contact with one another individual winding core configuration pieces 4, 5 resulting from the division of a winding core 3 by two-way splitting. In the air core coil wire winding tool, each of the winding core constituent pieces to be brought into contact with one another has a surface provided with an incline 19 for converting a force squeezing the winding core, which is exerted by a coil wire 18, into forces in the respective directions in which the winding core constituent pieces are to be pulled out.

Description

Air-core coil winding jig and air-core coil manufacturing method

The present invention relates to an air core coil winding jig and an air core coil manufacturing method used for manufacturing an air core coil.

In the manufacture of air-core coils, a method for manufacturing air-core coils in which a self-bonding wire is wound around a core, the coil is self-bonded and hardened, and the coil fixed by self-fusion is removed from the core is proposed. ing. As a method of removing the coil from the core after winding using this air core coil manufacturing method, a method of extruding the coil with a plate having a hole having the same shape as the core has been proposed (see Patent Document 1). However, when the self-bonding wire is wound around the core, a force is applied to the core by the self-bonding wire to tighten the core, so that it is difficult to remove the coil from the core. In order to facilitate coil removal, there is a winding jig with a structure in which the winding core is divided into three parts and the contact surface between the split core at the center and the split cores on the left and right sides of the split core is inclined. There has been proposed a method in which the core diameter is contracted by removing the center divided core after winding and bringing the left and right divided cores to the center (see Patent Document 2).

Japanese Patent Laid-Open No. 2-30107 Japanese Utility Model Publication No. 57-078630

As described above, in the manufacture of an air core coil in which the self-bonding wire is wound around the core and then the coil is self-fused and removed from the core, the coil wire is wound around the core by winding the coil wire. Since the tightening force is applied to the winding core, it is difficult to remove the coil from the winding core. In addition, the winding jig divides the winding core and the winding width suppression plate and moves the winding core to the center to remove the coil. Operation is necessary, work takes time, and measures for easily removing the coil from the winding core have become problems.

The present invention has been made to solve the above-described problems, and has an object to easily remove a coil from an air-core coil winding jig in the manufacture of an air-core coil. Yes.

An air-core coil winding jig according to the present invention is an air-core coil winding jig in which the winding core is configured by bringing the winding core into two parts and bringing the individual winding core constituent pieces into contact with each other. In addition, the surfaces of the winding core constituent pieces that are in contact with each other are inclined so as to convert the force of tightening the winding core of the coil wire into the force in the direction of pulling out each of the winding core constituent pieces.

According to the present invention, there is provided an air-core coil winding jig in which the winding core is configured by bringing the winding core into two parts and bringing the divided winding core constituent pieces into contact with each other. Since the surfaces that come into contact with each other are inclined to convert the force for tightening the core of the coil wire into the force in the direction of pulling out each core core component piece, the tightening force due to the winding of the coil wire is The inclination is converted into a direction perpendicular to the winding direction, and a gap is formed between the winding core and the coil by moving the two winding core constituent pieces along the inclination. It can be easily removed from the core coil winding jig.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, is an exploded perspective view of an example of an air core coil winding jig, and is also a figure which shows the state before assembling a winding jig. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is sectional drawing which shows an example of the state which wound the coil wire around the winding jig in the state after completion of an assembly of an air core coil winding jig, and formed the coil. . It is a figure which shows Embodiment 1 of this invention, and is sectional drawing which illustrates one process which removes the coil after shaping | molding from the winding jig | tool from the state of FIG. 2, and is displayed on the cross section different from FIG. The figure which shows Embodiment 1 of this invention, and the figure which illustrates the process of removing the completed air core coil from an air core coil winding jig after finishing winding of a coil wire with a winding machine It is. It is a figure which shows Embodiment 4 of this invention, (A) is sectional drawing which shows the state after completion of an assembly of an air core coil winding jig, (B) is a coil after shaping | molding from the state of (A) It is sectional drawing which illustrates one process which removes from a winding jig | tool, Comprising: It represents with the cross section different from (A). It is a figure which shows Embodiment 5 of this invention, and is another exploded perspective view of an air core coil winding jig, and is also a figure which shows the state before assembling a winding jig.

Embodiment 1 FIG.
A first embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4. FIG.
Between the winding width suppressing plate 1 and the winding width suppressing plate 2, a core 3 divided into two parts is arranged. The winding core 3 is screwed by the winding width suppressing plate 1 and the winding width suppressing plate 2 with

screws

10, 11, 12, 13, 26, 27.
The screw 10 passes through the through hole 31 of the winding width suppressing plate 1 in a loosely fitting state and is screwed into the screw hole 41 of the core component 5, and the screw 11 loosely fits the through hole 33 of the winding width suppressing plate 1. The winding width restraining plate 1 and the winding core component 5 are integrated to form the winding jig component piece 47 by being threaded through and screwed into the screw hole 42 of the winding core component 5.
The screw 12 passes through the through hole 39 of the winding width suppressing plate 2 in a loosely fitting state and is screwed into the screw hole 43 of the core component 4, and the screw 13 loosely fits the through hole 40 of the winding width suppressing plate 2. The winding width restraining plate 2 and the winding core component 4 are integrated to form a winding jig component 48 by being penetrated through and screwed into the screw hole 44 of the winding core component 4.
The bolt 26 passes through the through hole 32 of the winding width suppressing plate 1, the through hole 35 of the winding core component 5, and the through hole 37 of the winding core component 4 in a loosely fitted state, and the screw hole 45 of the winding width suppressing plate 2. The bolt 27 passes through the through hole 34 of the winding width restraining plate 1, the through hole 36 of the core core component 5, and the through hole 38 of the core core component 4 in a loosely fitted state. By being screwed into the second screw hole 46, the winding jig constituent piece 47 and the winding jig constituent piece 48 are integrated to complete an air-core coil winding jig.
The winding width suppressing plate 1 and the winding width suppressing plate 2 cooperate to suppress or regulate the coil width to a predetermined length when the coil wire 18 is wound around the winding core 3. The relative distance between the winding width suppression plate 1 and the winding width suppression plate 2 is determined by the length of the core 3 that supports the winding

width suppression plates

1 and 2. A coil is formed by winding a predetermined number of coil wires 18 around the core 3 to form a coil shape, and is distinguished from the coil wire 18.
The winding core 3 has a structure divided into winding

core constituting pieces

4 and 5, and the winding core 3 is formed by the pair of winding

core constituting pieces

4 and 5. The

core constituting pieces

4 and 5 are in surface contact with each other, and the respective relative contact surfaces 19 are inclined at the same inclination angle to form inclined surfaces.
In the example of the present embodiment, the core 3 is assumed to form a square cylindrical coil, and has a shape that becomes a quadrangular prism by combining the two core-

constituting pieces

4 and 5.
The winding core 3 has four

corner portions

6, 7, 8, and 9 in the circumferential direction on the surface around which the coil is wound, that is, the outer peripheral surface of the winding core 3. Each of the

corner portions

6, 7, 8, and 9 is an arc having a radius of curvature of about several millimeters.

Further, the winding width suppressing plate 1 and the winding core component piece 4 are fixed and integrated by

screws

10 and 11, and the winding width suppressing plate 2 and the winding core component piece 5 are fixed by

screws

12 and 13. It is integrated. An integrated assembly (winding jig constituent piece 47) of the integrated winding width suppressing plate 1 and the core forming piece 4, and an integrated assembly of the winding width suppressing plate 2 and the core forming piece 5 The (winding jig constituting piece 48) is inserted through the through

holes

32 and 34 of the winding width restraining plate 1 and penetrates the through

holes

35, 36, 37 and 38 of the winding

core constituting pieces

4 and 5 to restrain the winding width. As shown in FIG. 2, the air-core coil winding jig can be attached to a winding machine (not shown) by

screws

26 and 27 made of bolts screwed to the

female screws

45 and 46 of the plate 2. Assembled into.
A hole 14 is provided in the center of the winding

width restraining plates

1 and 2 and the core-constituting

pieces

4 and 5 so as to extend through each of them. The air core coil winding jig of the present invention is fixed to a winding machine.
The screws 10 to 13, 26, and 27 need to be provided at positions away from the central axis of the winding core while avoiding the winding machine shaft 15, but the

screws

26 and 27 are provided with two winding cores 3 and winding

width suppression plates

1, 2. In order to maintain the shape of the sandwiching jig via the pin, it is desirable to arrange it at a symmetrical position from the central axis of the winding core. In addition, the coil wire needs to be a screw that can be fastened with sufficient force while the coil wire is forced to press the core and the two cores move along the inclination. The screws 10 to 13 need to be disposed at positions avoiding the

screws

26 and 27 and the winding machine shaft 15, but are for fastening the winding

width suppressing plates

1 and 2 and the winding core 3, and two or more of each. It is desirable to fix with. Further, the provision of the positioning mechanism has the effect of preventing displacement due to jig disassembly and assembly, and preventing coil winding disturbance.

According to such a mechanism, after winding the coil wire 18 around the core, the two core-constituting

pieces

4 and 5 can be moved along the inclined surface 19. During winding, the coil wire 18 needs to be wound while being tensioned, so that the coil wire 18 is subjected to a force for tightening the core, but the inclined surface 19 of the core-constituting

pieces

4 and 5 has a tightening force. A part is converted into a force perpendicular to the winding direction, which makes it easier to move the two cores away from each other. By moving the

core constituent pieces

4 and 5 along the inclined surface 19 in a direction perpendicular to the winding direction, the dimensions of the core shrink, and a gap 20 is formed between the inside of the coil after winding and the core. Can be provided. Therefore, the coil 21 to which a tightening force is applied after winding can be easily removed. This jig is a mechanism independent of the winding machine, and has a structure in which a mechanism for facilitating the removal of the coil 21 can be realized by using only the jig, and therefore there is an advantage that no driving force is required.
After the coil wire is wound around the winding jig by the winding machine to form the coil on the winding jig (see FIG. 4A), the bobbin fixing jig 16 is attached as shown in FIG. 4B. After removing the winding jig on which the coil is formed from the winding machine shaft 15 (see FIG. 4 (C)), and then loosening the

screws

26 and 27, the coil wire tightens the core 3 during winding. Winding jig constituent piece 47 (integrated assembly comprising the winding width suppressing plate 1, the core constituent piece 5, the screws 10 and 11) and the winding jig constituent piece 48 (the winding width suppressing plate 2, the core constituent) The integrated assembly composed of the piece 4 and the

screws

12 and 13 is pressed against each other, and internal stress acts in a direction perpendicular to the inclined surface and in a direction along the inclined surface. At this time, the internal stress in the direction perpendicular to the inclined surface is canceled by the core

constituent pieces

4 and 5, but the internal stress in the direction along the inclination is the force that moves the core

constituent pieces

4 and 5 along the inclination. Is converted to Assuming that the tightening force by the winding is F and the inclination angle is θ, the force that the

core constituting pieces

4 and 5 move along the inclined surface is expressed by Fsinθ, and the

core constituting pieces

4 and 5 are inclined. Is moved relative to the direction in which the diameter of the core 3 is automatically reduced by moving along (the core-constituting

pieces

4, 5 are moved away from each other along the center line of the hole 14). 3 (a state in which the core diameter is contracted and is a state in a previous stage for removing the winding width suppressing plate 2 and the core-constituting piece 5 to make the coil removable), and for removing the coil 49 The operation of removing the core from the winding jig and the operation of contracting the core diameter are performed during the same operation.
After the

screws

26 and 27 are extracted, the winding jig component 47 is first extracted as illustrated in FIG. 4D, and then the air-core coil 49 is wound as illustrated in FIG. 4E. Remove from the jig component piece 48.

Further, the structure of the winding jig according to the present embodiment can realize a mechanism for contracting the core in order to make it easy to remove the core by only the shape of the core, so that the spring that contracts the core inside the core. It is not necessary to provide a mechanism such as. The winding jig according to the present embodiment can be applied to a small-diameter coil in which the volume of the core is small and a mechanism for contracting the core cannot be provided inside the core, and the coil can be used regardless of the size or shape of the core. Has the effect of facilitating removal.
Since it is not necessary to remove the

screws

10, 11, 12, 13 when removing the coil, the

screws

10, 11, 12, 13 and the winding

width restraining plates

1, 2, and the

core constituting pieces

4, 5 can be moved relatively. There is no need for a structure, and the core diameter can be reduced even if it is an integral object. Many of the structures for shrinking the core diameter need to be provided with a mechanism such as making the through hole of the screw a long hole in order to relatively move the core component and the winding width suppressing plate. The jig can also be applied to a coil having a small cross-sectional area of the core where screws cannot be arranged.

Further,

concave portions

22 and 23 having the same shape as the core 3 are provided on the surface of the winding

width restraining plates

1 and 2 that touch the

core constituent pieces

4 and 5. When the winding

core constituent pieces

4 and 5 are combined so that the inclined surfaces come into contact with each other, the gap between the winding

width suppressing plates

1 and 2 and the wall surfaces 21 and 22 of the

recesses

22 and 23 is filled. The core shape is suppressed by hitting the wall surfaces 24 and 25 of the suppression plate recesses 22 and 23. According to such a structure, the position of the core-constituting

pieces

4 and 5 is determined by touching the wall surface of the recess, and positioning is facilitated. Moreover, when removing the coil after winding, the diameter of the core 3 can be shrunk by removing the

screws

26 and 27, and there exists an effect which makes assembly work easy. In addition, the position of the core-constituting piece does not change by assembly, and the same core shape can be formed. Therefore, there is an effect of reducing the influence on the winding and stabilizing the winding.

Further, the core 3 divided into two parts with an inclination can be combined with no gaps with the inclined surfaces aligned. In the manufacture of air-core coils, it is necessary to wind the self-bonding wire around the core and then apply heat to melt the self-bonding layer of the self-bonding wire and harden the coil. For this reason, pressure may be applied from the outside. If the cores are divided without providing an inclination, and a gap is provided between the cores, when the coil is pressurized from the outside, the coil wire inside the coil enters the gap between the cores and the coil deforms. End up. At this time, the coil wire of the winding core is damaged.
The start and end of the inclination for dividing the winding core 3 must be provided on the surface where the winding core 3 comes into contact with the winding

width suppressing plates

1 and 2. This time, as an example, it is a figure with an inclination on the short side of the coil, but depending on the application, the surface that needs to secure insulation inside the coil is not inclined, and the side where insulation is not required is inclined It is desirable to have a structure.

According to the structure of the winding jig of the present embodiment, there is no gap between the two divided cores, so that after winding the coil wire, the coil wire is not pressed even if pressed from the outside for self-bonding. A coil without deformation can be manufactured without entering the gap between the winding cores.

According to the first embodiment, in a winding jig for manufacturing an air-core coil, in order to facilitate the removal of the coil, the core is divided into two parts and the surface where the two cores touch is inclined. Therefore, since the coil wire has a structure that converts the force of tightening the core into a force in the direction of pulling out the core, the tightening force applied to the core by winding can be converted into a force that contracts the core. The coil can be easily removed. Moreover, since it can form without providing a clearance gap between winding cores, the deformation | transformation of the coil by a coil wire entering in a clearance gap can be prevented.
In addition, since the winding

width suppressing plates

1 and 2 have the same shape as the core, the positioning of the core is facilitated and the jig is easily assembled.

As described above, in the air-core coil winding jig according to the first embodiment, the core 3 is divided into two parts, and the individual core-constituting

pieces

4 and 5 obtained by dividing the core 3 are brought into contact with each other. An air-core coil winding jig that is configured, wherein a force F that causes the coil wire 18 to fasten the core 3 is applied to the surfaces of the core-constituting

pieces

4 and 5 that are in contact with each other. 4. Inclination 19 is applied to convert the force into the direction in which the

wires

5 and 5 are pulled out, and each of the

core components

4 and 5 is tightened in a direction opposite to the force in the direction of pulling out each of the

core components

4 and 5. Screws (clamps) 26 and 27 are provided, and by loosening the screws (clamps) 26 and 27, the coil wire 18 tightens the core 3 by the force with which the coil wire 18 tightens the core 3. Each of them moves in the pulling direction (direction in which each of the

core constituting pieces

4 and 5 is relatively separated). Is shall.

Embodiment 2. FIG.
Further, in FIG. 1, a rectangular core is shown assuming a winding of a square coil, but the shape of the core may not be rectangular. Even if the core shape is other than a quadrangle, the winding core is divided into two parts with an inclination, and the winding core is assembled so that the inclined surface is touched, so that the tightening force applied to the core by winding is perpendicular to the winding direction. This makes it easier to move the core along the inclination.
According to this structure, there is an advantage that a structure for contracting the core can be applied to various core shapes.

Embodiment 3 FIG.
Further, the winding core of this winding jig may be made of a metal material. In the air-core coil, it is necessary to wind the self-bonding wire around the winding core, and then heat and melt the self-bonding layer to bond the coil wires together. At this time, the coil and the core are thermally expanded. However, if a material having a smaller thermal expansion diameter than that of the coil wire is used as the material of the core, the thermal expansion of the coil is larger than that of the core. There is a gap between them, which has the effect of facilitating removal of the coil after winding.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described below with reference to FIG.
In the air-core coil winding jig of the fourth embodiment, a groove for fitting the coil wire is formed on the outer periphery of the core, and at least one of the side walls of the groove is in contact with the core-constituting pieces. It is characterized in that it is inclined at an inclination angle gentler than the inclination angle of the surface to be inclined. In addition, when a groove for fitting a coil wire is provided in the core, and the groove is formed by two side inclinations, at least one side of the inclination angle is made gentler than the inclination angle of the core so that it can be fitted into the groove. The coil winding jig is characterized in that the coil can be removed after winding.
You may attach the groove | channel for inserting a coil wire in the side surfaces 50 and 51 or the

corner parts

6, 7, 8, and 9 (refer FIG. 1) of the

core component pieces

4 and 5. FIG. At this time, in order to be able to remove the coil after winding, the groove needs to be inclined more gently than the inclined surface 19 of the core-constituting piece. For example, in FIGS. 5A and 5B, assuming a groove 523 having a shape in which a coil wire is sandwiched between two

adjacent slopes

52 and 53, at least the slope 53 is the slope of the sloped surface 19 of the core constituting piece. It must be a straight line having an inclination angle that is the same as or gentler than the inclination angle. However, the inclination angle of the inclination 52 on the opposite side may be a steeper inclination angle than the inclination angle of the core component piece 19. That is, the shape of the side wall of the groove 523 may be asymmetrical.
According to this structure, by fitting the coil wire into the groove 523 of the core, the position of the coil is difficult to shift, and the winding disturbance can be suppressed, and the coil 49 after winding can be removed from the core 3. .
The groove 523 of the core

constituent pieces

4 and 5 for fitting the coil wire has a structure with no inclination when the pitch of the grooves 523 is the same position after the left and right

core constituent pieces

4 and 5 are combined. A coil provided with a cross point can be wound. When the pitches of the grooves 523 are shifted by one pitch after the winding

core constituent pieces

4 and 5 are combined, a coil provided with a cross point on an inclined surface can be wound.

Embodiment 5 FIG.
The fifth embodiment of the present invention will be described below with reference to FIG.
In the air-core coil winding jig of the fourth embodiment, one core constituent piece of a plurality of core constituent pieces is divided into a plurality of core constituent pieces, and the other core constituent piece of the plurality of core constituent pieces. Is a wedge inserted between the one plurality of core constituent pieces, and an inclination corresponding to the inclination of the wedge is provided in each of the one plurality of core constituent pieces. It is characterized by this.
In the first embodiment, the winding jig has a two-divided structure, but the winding core may be divided into four with the same structure. For example, as shown in FIG. 6, the core 3 is divided into four so that both the long side direction and the short side direction are inclined, and the core 3 is composed of four winding frames 55, and is wound around the center. By providing a wedge 54 having an inclination opposite to that of the frame 55, the winding frame 55 at the four corners is expanded when the wedge 54 is pushed. In other words, the winding core is divided into four parts with an inclination in two directions. When winding, keep the same shape as the inner diameter of the coil, and after winding the coil, remove the wedge at the center of the winding core so that the four corner cores are The coil winding jig is structured so that the coil can be removed without damaging the insulating coating inside the coil.
According to the winding jig having this structure, the winding frame 55 of the winding core 3 moves on both the short side and the long side, and a gap is formed between the winding core 3 and the coil 49. The coil 49 can be removed without impairing the insulation of the inner surface of the 49.

In the present invention, the embodiments can be appropriately combined, modified, and omitted within the scope of the invention.
In addition, in each figure, the same code | symbol shows the same or equivalent part.

1 winding width suppressing plate, 2 winding width suppressing plate, 3 cores, 4, 5 core constituent pieces, 6, 7, 8, 9 core corner portions, 10, 11, 12, 13 screws, 14 holes, 15 windings Wire machine shaft, 16 bobbin fixing jig, 18 coil wire, 19 winding core component sloping surface, 20 gap between coil and winding core, 21 coil, 22, 23 winding width suppression plate recess, 24, 25 recess wall, 26, 27 Screw (clamp), 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Through hole, 41, 42, 43, 44, 45, 46 Screw hole, 47 , 48 winding jig components, 49 coils, 50, 51 core side, 52, 53 groove slope, 523 groove, 54 wedge, 55 reel.

Claims

An air-core coil winding jig in which the winding core is configured by bringing the winding core into two parts and contacting each other, and the surfaces of the winding core-forming pieces that are in contact with each other Further, the air core coil winding jig is characterized in that a coil wire is inclined so as to convert a force for tightening the core into a force in a direction in which each core core component piece is pulled out.
An air-core coil winding jig in which the winding core is configured by bringing the winding core into two parts and contacting each other, and the surfaces of the winding core-forming pieces that are in contact with each other The coil wire is inclined so as to convert a force for tightening the core into a force in a direction in which each of the core components is pulled out, and in a direction opposite to the force in the direction of pulling out each of the core components. An air-core coil comprising a clamp for tightening each of the core-constituting pieces, wherein each of the core-constituting pieces is movable in the pulling direction under the relaxed state of the clamp. Winding jig.
The air core coil winding jig according to claim 1 or 2, wherein an end of the core is provided on each of the winding width suppression plates provided at both ends of the core to limit the coil width to a predetermined length. An air core coil winding jig, wherein an engraving having the same shape as the core to be inserted is provided.
The air core coil winding jig according to any one of claims 1 to 3, wherein the coil wire is a self-bonding wire, and a linear expansion coefficient of the core is a linear expansion of the coil wire. An air-core coil winding jig characterized by being smaller than the coefficient.
The air core coil winding jig according to any one of claims 1 to 4, wherein a groove for fitting a coil wire is formed on an outer periphery of the core, and at least one side wall of the side wall of the groove. However, the air-core coil winding jig is inclined at an inclination angle looser than the inclination angle of the inclination.
The air core coil winding jig according to any one of claims 1 to 5, wherein one core constituent piece of the core constituent piece is divided into a plurality of pieces, and the core constituent piece The other core constituent piece is a wedge inserted between the plural core constituent pieces, and an inclination corresponding to the inclination of the wedge is provided in each of the plural core constituent pieces. An air-core coil winding jig characterized by being made.
The winding core is divided into two parts, and the individual core constituent pieces divided into two are brought into contact with each other, and the coil core has a force for tightening the core on the surface of the core constituent pieces that are in contact with each other. A clamp that is inclined to convert the force to the direction of pulling out each of the core component pieces, and that clamps each of the core component pieces in a direction opposite to the force in the direction of pulling out each of the core component pieces. An air-core coil manufacturing method for manufacturing an air-core coil using an air-core coil winding jig in which each of the core-constituting pieces is movable in the pulling direction under the relaxed state of the fastener. Because
Under the state where each of the core constituent pieces is clamped by the clamp in the direction opposite to the force in the pulling direction, the coil wire is wound around the core to form an air core coil,
After the air-core coil is formed, the clamp is loosened, and after each of the core-constituting pieces of the core moves in the pulling direction, the air-core coil is removed from the core. Air core coil manufacturing method.
The air core coil manufacturing method according to claim 7, wherein when the clamp is loosened, each of the core-constituting pieces moves in the pulling direction by a force with which the coil wire tightens the core. An air core coil manufacturing method characterized by the above.
The air core coil manufacturing method according to claim 7 or 8, wherein the coil wire is a self-bonding wire, and the air-core coil is removed from the winding core after self-bonding the air-core coil. Coil manufacturing method.