KR20190037730A - Method and device for coil's winding - Google Patents

Abstract

The present invention relates to a coil winding method capable of consecutively winding coils having particular shapes with different thicknesses and widths. The disclosed coil winding method includes: a core fixing step of fixing a core of a rotor or a stator to a rotatable spindle; a coil guiding step of attaching the coil to the side surface of the core; a winding step of winding the coil on the core with rotational force from the spindle; a pressing step of making a rotating roller press the coil toward the core in a direction different from a clipper; and a completion step of separating the core completed with winding from the spindle.

Description

METHOD AND DEVICE FOR COIL'S WINDING BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a winding method and a winding apparatus for a coil and, when assembled to a rotor and a stator, has a special shape coil having a different thickness and width The present invention relates to a winding method and a winding apparatus for continuously winding coils.

In recent years, researches for increasing the efficiency of motors are being actively carried out. Especially, improvement of efficiency of electric motors and generators used in electric vehicles and power generation facilities can cause a great economic effect, so that attention can be made especially remarkable.

Accordingly, as a method for improving the efficiency of the electric motor and the generator, various methods for improving the load factor (space factor, coil space factor or conductor occupying ratio) of the coil wound around the loader or the stator have been studied .

As a general method for improving the drop rate of a conventional coil, a method of increasing the diameter of the coil wound on the rotor or the stator or increasing the number of turns has been mainly used.

However, in the case of a conventional coil, a wire having a circular vertical cross section is commonly used, and if the diameter of the circular coil is increased for high efficiency and high output, there is a waste in the coil layer There is a fundamental problem that the drop rate of the coil is lowered because a waste space is generated.

On the other hand, when a coil having a too small diameter is wound, there is a problem that efficiency may be lowered and heat generation may be caused due to an increase in relative electrical resistance.

In order to solve the above problems, MSO (Maximum Slot Occupy) coils have been developed to solve the above problems. These MSO coils have a tapered shape in order to maximize the dot rate in the core and have a special shape , It is not easy to apply to a core of a rotor or a stator as a general winding method.

Accordingly, it is required to develop a new winding method and a winding device that can easily and quickly wind the MSO coil having a special shape to the core, and can satisfy both the production cost and the production speed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of winding a coil having a specific shape that is different in thickness and width for each partial region corresponding to each turn so as to have a relatively high dot ratio when assembled to a rotor and a stator A winding method of a coil, and a winding device.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not to be construed as limiting the invention as defined by the artistic scope and spirit of the invention as disclosed in the accompanying claims. It will be possible.

According to an aspect of the present invention, there is provided a method of winding a coil, comprising: a core fixing step of fixing a core of a rotor or a stator to a spindle rotatably provided; A coil guiding step in which the clipper grips and fixes the strands of the coil up and down and brings the coil into close contact with the side surface of the core; A winding step in which the spindle rotates the core and the coil is wound on the core by the rotational force of the spindle; A pressing step in which a roller, which is rotated in close contact with the coil wound on the core, urges the coil toward the core in a direction different from the clipper; And a finishing step of separating the core from which the winding of the coil is completed, from the spindle.

At this time, in the winding step, the clipper moves in a state in which the coil is in close contact with the core along a direction parallel to the rotation axis of the core rotating, and the coil is wound up from the lower end to the upper end of the core , And the coil can be wound down from the upper end to the lower end of the core.

According to another aspect of the present invention, there is provided a method of winding a coil, the method comprising: a bobbin joining step of joining a second bobbin provided to wind a coil on a first bobbin rotatably provided; A coil guiding step in which a clipper grips and fixes a strand of the coil up and down, and the coil is brought into close contact with the side surface of the second bobbin; A winding step of winding the coil on the second bobbin by a rotational force of the second bobbin rotating together with the first bobbin when the first bobbin is rotated; A pressing step in which a roller, which is rotated in close contact with the coil wound on the second bobbin, presses the coil toward the second bobbin in a direction different from the direction of the clipper; A coil block forming step in which the coil is wound on the second bobbin and is formed of a coil block in which a plurality of coil layers are continuously stacked; And a bobbin separating step of separating the second bobbin and the first bobbin, and removing the second bobbin from the completed coil block.

Here, the winding step may be performed such that the clipper moves in a direction parallel to the rotation axis of the second bobbin being rotated, and the clipper moves to the upper end from the lower end of the second bobbin, The coil can be rolled up or the coil can be rolled up from the upper end to the lower end of the core.

At this time, the coil is composed of a plurality of coil layers when winding is completed, and the width of the partial coil layer corresponding to each turn decreases from the upper part to the lower part of the plurality of coil layers, And the vertical cross-sectional areas of the partial coil layers along the up-and-down height direction may all be formed to be the same.

And, in the pressing step, the roller can press the coil with the same slope as the taper shape of the coil.

Meanwhile, the winding apparatus of a coil according to the present invention comprises a plurality of coil layers when winding is completed, and the width of the partial coil layers corresponding to each turn decreases from the upper part to the lower part of the plurality of coil layers, And the vertical cross-sectional areas of the partial coil layers along the up-and-down height direction are all the same, characterized in that the upper end flange of the core is fixed A spindle for rotatably fixing the core through a first jig and a second jig for fixing a lower flange of the core; A clipper for guiding a winding position of the coil when the coil is wound on the core by rotation of the spindle by holding the coil of the coil up and down and fixing it to the side surface of the core; And a roller having a slope equal to the slope of the taper shape of the coil and urging the coil toward the core in a direction different from the direction of the clipper in close contact with the coil wound on the core.

At this time, the core is formed with grooves and projections on one side and the other side of the upper flange, and when assembled to the rotor or the stator, the upper flanges of the other cores adjacent to both sides and the upper flanges of the other cores, Can be combined.

In addition, the winding apparatus of a coil according to the present invention comprises a plurality of coil layers when winding is completed, and the width of the partial coil layers corresponding to each turn decreases from the upper part to the lower part of the plurality of coil layers, And the vertical cross-sectional areas of the partial coil layers along the up-and-down height direction are all formed to be the same, characterized in that the winding device comprises a first bobbin ; A second bobbin provided to be wound on the coil and coupled to an upper portion of the first bobbin; A clipper for guiding a winding position of the coil when the coil is wound on the second bobbin by rotation of the first bobbin by holding the coil of the coil up and down and fixing it to the side surface of the second bobbin; And a roller having a slope equal to the slope of the taper shape of the coil and urging the coil from the direction different from the clipper toward the second bobbin in close contact with the coil wound on the core.

The first bobbin includes a coupling bore inserted and coupled with the second bobbin and supporting a partial coil layer corresponding to the lowest turn of the plurality of coil layers when the coil is wound, Wherein the coupling hole is formed to have a radius of rotation that is narrower than the width of the partial coil layer corresponding to the lowermost turn of the plurality of coil layers so that when the roller urges the coil toward the second bobbin, So as not to interfere with each other.

The clipper may include a first tip and a second tip that are spaced apart from each other to hold the coil by vertically holding the coil, And the first tip may be formed thicker toward the center of the distal end portion, and the first tip may be formed thicker toward the center of the distal end portion.

The winding method and the winding apparatus according to the present invention having the above-described configuration are characterized in that when the rotor and the stator are assembled to the rotor and the stator, The coil of the shape can be continuously wound.

On the other hand, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a coil according to a first embodiment and a second embodiment of the present invention.
FIGS. 2 to 3 are views showing a method of winding a coil according to a first embodiment of the present invention and a winding apparatus used therein.
4 is a view illustrating a clipper of a winding apparatus for a coil according to a first embodiment of the present invention.
5 is a view showing a core according to the first embodiment of the present invention.
6 is a view showing a modification of the winding method of the coil according to the first embodiment of the present invention.
7 to 8 are views showing a coil wound on a core through a method of winding a coil according to a first embodiment of the present invention.
9 to 10 are views showing a method of winding a coil according to a second embodiment of the present invention and a winding apparatus used therein.
11 is a view showing a coil block wound through a coil winding method according to a second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention in which the object of the present invention can be specifically realized will be described with reference to the accompanying drawings. In describing the present embodiment, the same names and the same symbols are used for the same components, and further description thereof will be omitted.

Further, in describing the present embodiment, the configuration shown in the drawings is only an example for helping understanding of the detailed description, and thus the scope of the right is not limited.

First, a method of winding a coil according to a first embodiment of the present invention and a winding apparatus used therefor will be described in detail with reference to FIGS. 1 to 8. FIG.

The winding method of the coil according to this embodiment may include a core fixing step, a coil guiding step, a winding step, a pressing step, and a separating step.

The core fixing step may fix the core 20 of the rotor or stator to the spindle 100 rotatably provided as shown in Figs.

The spindle 100 includes a first jig 110 for fixing the upper flange 22 of the core 20 and a second jig 120 for fixing the lower flange 24 of the core 20, 20 can be rotated.

At this time, any one of the first jig 110 and the second jig 120 is moved toward the other one through a separate actuator (for example, a hydraulic cylinder) and moved close to each other with the core 20 interposed therebetween, (20) can be pressed and fixed.

The first jig 110 and the second jig 120 are formed in the upper flange 22 and the lower flange 24 of the core 20, respectively, And the second jig 120, so that the rotational force of the spindle 100 can be transmitted to the core 20 in a stable manner.

In the coil guiding step, the clipper 200 can hold the coil 10 up and down and fix the coil 10 to the side surface of the core 20.

When the core 20 is rotated by the rotational force of the spindle 100, the clipper 200 winds the coil 10 on the core 20 using the rotational force of the rotated core 20, The coil 10 is guided so as not to overlap with the overlapping region of the coil 10 wound on the coil 10.

In the winding step, the spindle 100 rotates the core 20 and rotates the coil 10 through the interaction of the rotational force of the spindle 100 and the clipper 200 which closely contacts the coil 10 toward the spindle 100, Can be wound around the core 20. [

The core 10 is moved in a direction parallel to the rotation axis of the rotating core 20 while the coil 10 is in close contact with the core 20, From the bottom to the top or from the top to the bottom.

The clipper 200 can approach or retract toward the core 20 and is provided to rotate the shaft so that the coil 10 can easily approach the core 20 in a state where the coil 10 is fixed, 20).

The coil 10 is wound in the overlapping region of the core 20 when the core 20 makes one turn and the coil 10 forms one turn and the core 20 rotates one more turn to form the next turn The inclination of the coil 10 may be adjusted in a state where the coil 10 is fixed so as not to overlap.

3, when the winding is completed, the coil 10 is composed of a plurality of coil layers, and the width of the partial coil layers corresponding to each turn decreases from the upper portion to the lower portion of the plurality of coil layers, And is formed in a tapered shape having an inclined outer surface, and is formed so as to correspond to each turn wound on the core 10 through a separate process so that the vertical cross-sectional areas of the partial coil layers along the vertical direction are all the same The partial regions may be formed to have a step difference and a width difference.

The coil 10 is not shown in FIG. 11. However, when the winding is completed as shown in FIG. 11, one side of the four sides is inclined at a predetermined angle so that the inclined surface having a continuously inclined outer surface can be formed .

The coil 10 may be formed through a separate process using a forging process such as rolling and pressing and may be formed by a casting process such as die casting or the like. Various methods can be used without limitation.

As shown in FIG. 4, the clipper 200 gradually changes the thickness of the partial area of the coil 10 corresponding to each turn so that the coil 10 can stably hold the coil 10 and come into close contact with the core 20, And may include a first tip 210 and a second tip 220 that are provided to adjust the distance and hold the coil 10 up and down to fix the coil.

The first tip 210 and the second tip 220 of the clipper 200 may have a beak formed so as to have a narrow width toward the front end where the core 20 is viewed when guiding the winding position of the coil. Or the like.

In addition, in the case of the first tip 210, not only the width is narrowed toward the front end portion but also the thickness is increased toward the center of the front end portion, thereby reinforcing the portion where the load is concentrated by the coil 10 wound around the core 20 And the load applied can be distributed to other parts.

The roller 300 that is rotated in close contact with the coil 10 wound on the core 20 can press the coil 10 toward the core 20 in a direction different from the direction of the clipper 200 in the pressing step.

The coils 10 that have already been wound around the core 20 and are out of contact with the clipper 200 are pressed against the core 20 repeatedly or continuously by the roller 300 as the core 20 rotates The coil 10 can be tightly wound on the core 20 more tightly.

At this time, the roller 300 can press the coil 10 with the slope equal to the slope of the taper shape generated due to the difference in width for each turn of the coil 10 wound on the core 20.

5, grooves 22a and projections 22b are formed on one side and the other side of the upper flange 22 of the core 20, respectively, according to the winding method and winding apparatus of the present embodiment The upper and lower flanges of the other core 20 and another core 20 adjacent to each other when assembled to the rotor or the stator may be provided to be coupled to each other by the grooves 22a and the projections 22b.

This makes it possible to assemble more firmly than when the core 20 is applied to a rotor or a stator, and to reduce friction and noise due to up and down movement between the cores 20.

According to the winding method of the present invention, as shown in FIG. 6, a pre-bending point 12 is placed between partial regions corresponding to each turn of the coil 10 to wind the coil 10 It is possible to prevent the coil 10 from bending due to the rotation of the core 20 and to prevent the mechanical properties of the coil 10 from being deformed.

This prebending point 12 is created by preheating the coil 10 to have a bending internal angle at an angle between 90 degrees and 180 degrees by applying heat to the point at which the bending occurs when the coil 10 is wound on the core 20. [ .

In the separation step, as shown in FIG. 7, the core 20 having completed the winding of the coil 10 can be separated from the spindle 100.

As shown in FIG. 8, the coil 10 wound on the wound core 20 is composed of a plurality of coil layers, and the plurality of coil layers are divided into a partial coil layer The width of the partial coil layer may be reduced and the thickness thereof may be increased to form a tapered shape having an inclined outer surface.

For example, when it is assumed that the first coil layer 10a and the partial coil layer located directly under the first coil layer are located at the top of the plurality of coil layers, the second coil layer 10b The thickness t2 of the third coil layer 10b is relatively thicker than the thickness t1 of the first coil layer 10a and the thickness t3 of the third coil layer 10c is greater than the thickness t2 of the second coil layer 10b t2) of the first and second electrodes.

The width w2 of the second coil layer 10b is smaller than the width w1 of the first coil layer 10a and the width w3 of the third coil layer 10c is smaller than the width w2 of the second coil layer 10b, May be formed to be relatively narrow as compared with the width w2 of the protrusion 10b.

The vertical cross-sectional area of the first coil layer 10a is equal to w1 * t1 and equal to w2 * t2, which is the vertical cross-sectional area of the second coil layer 10b, and w3 * t3, have.

Since each of the partial coil layers 10a to 10f corresponding to each turn of the plurality of coil layers has the same thickness and width but has the same vertical cross-sectional area, the electric resistance applied to each turn of the plurality of coil layers is uniform The core 20 can be produced.

This means that it is possible to produce electric motors and generators having low heat generation and high efficiency and it is possible to produce electric motors and generators having relatively high efficiency in low speed and high torque operation intervals.

In particular, when applied to a motor having a low number of practical rotations of a motor or a small number of poles, better efficiency can be expected, and when applied to an electric motor for an electric vehicle in which efficiency characteristics are very important at a low speed, Lt; / RTI >

Next, a winding method of a coil and a winding device used therefor according to a second embodiment of the present invention will be described in detail with reference to FIGS. 9 to 11.

The winding method of the coil according to this embodiment may include a bobbin coupling step, a coil guiding step, a winding step, a pressing step, a coil block forming step, and a finishing step.

In the bobbin bonding step, the second bobbin 410 may be coupled to the first bobbin 420, which is rotatable, as shown in FIG.

Here, the first bobbin 420 may be rotated by receiving a rotational force from a separate driving source such as a motor, and the second bobbin 410 may be fixed to the upper end of the first bobbin 420 .

10, the second bobbin 410 is inserted and coupled to the upper end of the first bobbin 420. When the coil 10 is wound, A coupling member 422 supporting the layer may be provided.

The coupling member 422 is formed to have a radius of rotation that is narrower than the width of the partial coil layer corresponding to the lowermost coil layer among the plurality of coil layers. In the pressing step described later, the roller 300 rotates the coil 10, It is possible to prevent the roller 300 from interfering with each other when pressing it against the bobbin 410.

The second bobbin 410 may include a separate jig that pushes the second bobbin 410 toward the first bobbin 420 in contact with the upper end of the second bobbin 410 and exerts a clamping force And this jig may be provided to be rotatable with the second bobbin 410 by being operated by a separate actuator.

In the coil guiding step, the clipper 200 can hold the coil of the coil up and down and fix the coil 10 to the side surface of the second bobbin 410.

Here, the coil 10 is wound around the second bobbin 410 using the rotational force of the second bobbin 410 rotated when the second bobbin 410 is rotated by the rotational force of the first bobbin 420 of the clipper 200 And guides the coil 10 so that the coil 10 wound on the second bobbin 410 is not overlapped with the overlapped region.

When the first bobbin 420 is rotated in the winding step, the coil 10 can be wound on the second bobbin 410 by the rotational force of the second bobbin 410 rotated together with the first bobbin 420.

The clipper 200 is provided so as to move along the direction parallel to the rotation axis of the second bobbin 410 rotating in a state in which the coil 10 is in tight contact with the second bobbin 410, From the bottom of the second bobbin 410 to the top or from the top to the bottom.

The clipper 200 can approach or retract toward the second bobbin 410 and can rotate the shaft to easily access the second bobbin 410 while the coil 10 is fixed, Can be brought into close contact with the second bobbin 410.

When the core 20 makes one turn and the coil 10 makes one turn and the core 20 turns once more to form the next turn, the coil 10 is overlapped with the second bobbin 410 The inclination of the coil 10 may be adjusted so that the coil 10 may not be wound over the region.

The coil 10 according to the present embodiment is constituted by a plurality of coil layers when the winding is completed, like the coil of the first embodiment (see FIG. 3) described above, The thickness of the partial coil layer is decreased and the thickness of the partial coil layer is increased and the outer surface is formed into a tapered shape having a slope and the vertical sectional areas of the partial coil layers along the vertical direction are all the same, The partial regions corresponding to each turn wound on the core 10 may be formed to have a step difference and a width difference.

The coil 10 may be formed through a separate process using a forging process such as rolling and pressing and may be formed by a casting process such as die casting or the like. Various methods can be used without limitation.

In addition, the clipper 200 according to the present embodiment is also applicable to a case where the coils 10 are stably positioned in the same direction as the clipper 200 (see Fig. 4) of the first embodiment, And a first tip 210 and a second tip 220 which are provided to adjust the spacing between the coils 10 so that the coils 10 can be brought into close contact with the core 20 by holding the coils 10 up and down.

The first tip 210 and the second tip 220 of the clipper 200 may have a beak formed so as to have a narrow width toward the front end where the core 20 is viewed when guiding the winding position of the coil. Or the like.

In addition, in the case of the first tip 210, not only the width is narrowed toward the front end portion but also the thickness is thicker toward the center of the front end portion, and the portion where the load is concentrated by the coil 10 wound on the second bobbin 410 And it is possible to distribute the applied load to other parts.

The roller 300 which is rotated in close contact with the coil 10 wound on the second bobbin 410 can press the coil 10 toward the second bobbin 410 in a direction different from the direction of the clipper 200 have.

The coils 10 which have already been wound around the second bobbin 410 and released from the clipped state by the clipper 200 are repeatedly or continuously rotated by the roller 300 as the second bobbin 410 rotates, 410 so that the coil 10 can be tightly wound on the second bobbin 410 more tightly.

At this time, the roller 300 can press the coil 10 with a slope equal to the slope of the taper shape generated due to the difference in width for each turn of the coil 10 wound on the second bobbin 410.

In the coil block forming step, the coil 10 may be wound on the second bobbin 410 and may be formed as a coil block in which a plurality of coil layers are continuously stacked.

Here, as shown in FIG. 11, the width of the vertical section of the partial coil layer corresponding to the inner turn decreases from the upper portion to the lower portion, and the thickness of the coil block is increased, so that the coil block can be formed into a tapered shape having an inclined outer surface.

As in the first embodiment, the vertical cross-sectional areas of the partial coil layers along the vertical direction are all made the same, so that the electric resistance applied to each turn of the plurality of coil layers becomes uniform.

In the bobbin separating step, the second bobbin 410 is separated from the first bobbin 420, and the second bobbin 410 is removed from the wound coil block to obtain a completed coil block.

Since the completed coil block is inserted into the core of the rotor or the stator through insertion, no additional winding work is required, so that it is easy to assemble and high productivity.

In addition, it is possible to reduce the waste space not occupied by the coil between the core and the core when the core is mounted on the core through the subsequent process, thereby improving the durability and uniformizing the electrical resistance per turn forming the coil layer have.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is obvious to them.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the invention is not limited to the above description, but may be modified within the scope and equivalence of the appended claims.

10: Coil
20: Core
100: spindle
200: Clipper
300: roller
400: Bobbin

Claims (11)

A core fixing step of fixing a core of a rotor or a stator to a spindle rotatably provided;
A coil guiding step in which the clipper grips and fixes the strands of the coil up and down and brings the coil into close contact with the side surface of the core;
A winding step in which the spindle rotates the core and the coil is wound on the core by the rotational force of the spindle;
A pressing step in which a roller, which is rotated in close contact with the coil wound on the core, urges the coil toward the core in a direction different from the clipper; And
And a finishing step of separating the core from which the winding of the coil is completed, from the spindle.
The method according to claim 1,
Wherein the winding step comprises:
The clipper moves in a state in which the coil is in close contact with the core along a direction parallel to the rotation axis of the core being rotated so as to wind up the coil from the lower end to the upper end of the core, And winding the coil.
A bobbin engaging step of engaging a second bobbin provided so that a coil can be wound on a first bobbin rotatably provided;
A coil guiding step in which a clipper grips and fixes a strand of the coil up and down, and the coil is brought into close contact with the side surface of the second bobbin;
A winding step of winding the coil on the second bobbin by a rotational force of the second bobbin rotating together with the first bobbin when the first bobbin is rotated;
A pressing step in which a roller, which is rotated in close contact with the coil wound on the second bobbin, presses the coil toward the second bobbin in a direction different from the direction of the clipper;
A coil block forming step in which the coil is wound on the second bobbin and is formed of a coil block in which a plurality of coil layers are continuously stacked; And
And a bobbin separating step of separating the second bobbin and the first bobbin, and removing the second bobbin from the completed coil block.
The method of claim 3,
Wherein the winding step comprises:
The clipper moves in a direction in which the coil is in close contact with the second bobbin along a direction parallel to the rotation axis of the rotating second bobbin so as to wind up the coil from the lower end to the upper end of the second bobbin, And winding the coil from the upper end to the lower end of the core.
The method according to claim 1 or 3,
The coil is composed of a plurality of coil layers when the winding is completed, and the width of the partial coil layer corresponding to each turn decreases from the upper part to the lower part of the plurality of coil layers, but the thickness increases and the outer surface has a slope And the vertical cross-sectional areas of the partial coil layers along the vertical direction are all formed to be the same.
6. The method of claim 5,
Wherein the pressing step comprises:
Wherein the roller has a slope equal to a slope of a tapered shape of the coil and urges the coil.
Wherein the coil layer is composed of a plurality of coil layers when the winding is completed and the width of the partial coil layer corresponding to each turn is decreased as the coil layers are moved from the upper part to the lower part of the plurality of coil layers, ), And the vertical cross-sectional areas of the partial coil layers along the vertical direction are all the same,
A spindle for rotatably fixing the core through a first jig for fixing the upper flange of the core and a second jig for fixing the lower flange of the core;
A clipper for guiding a winding position of the coil when the coil is wound on the core by rotation of the spindle by holding the coil of the coil up and down and fixing it to the side surface of the core; And
And a roller having a slope equal to the slope of the tapered shape of the coil and urging the coil against the core in a direction different from the direction of the clipper in close contact with the coil wound on the core.
8. The method of claim 7,
The core comprises:
Wherein a groove and a projection are formed on one side and the other side of the upper flange, respectively, and when the rotor or the stator is assembled, the upper flanges of the other cores adjacent to both sides and the upper flanges of the other cores are coupled to each other by the groove and the projections .
Wherein the coil layer is composed of a plurality of coil layers when the winding is completed and the width of the partial coil layer corresponding to each turn is decreased as the coil layers are moved from the upper part to the lower part of the plurality of coil layers, ), And the vertical cross-sectional areas of the partial coil layers along the vertical direction are all the same,
A first bobbin rotatably provided;
A second bobbin provided to be wound on the coil and coupled to an upper portion of the first bobbin;
A clipper for guiding a winding position of the coil when the coil is wound on the second bobbin by rotation of the first bobbin by holding the coil of the coil up and down and fixing it to the side surface of the second bobbin; And
And a roller having a slope equal to the slope of the taper shape of the coil and urging the coil in a direction different from the direction of the clipper toward the second bobbin in close contact with the coil wound on the core.
10. The method of claim 9,
The first bobbin includes:
A second bobbin inserted into the second bobbin and coupled to the second bobbin, the second bobbin being coupled to the first bobbin,
The coupling member may include:
The coil is formed so as to have a radius of rotation that is narrower than the width of the partial coil layer corresponding to the lowest turn of the plurality of coil layers so that the roller does not interfere with the roller when the coil urges the coil toward the second bobbin The coil winding device.
10. The method according to claim 7 or 9,
The clipper
And a first tip and a second tip provided so as to be spaced from each other to hold the coil of the coil up and down,
The first tip and the second tip are connected to each other,
The core or the second bobbin may have a width narrower toward a front end of the core or the second bobbin when guiding the winding position of the coil,
The first tip,
And the thickness of the coil is thicker toward the center of the front end portion.

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