KR20190037733A - Manufacturing methodes of coil - Google Patents

Abstract

The present invention relates to a coil manufacturing method, which continuously processes special shaped coils of different thicknesses and widths in each partial area corresponding to each turn so that the coils have a relatively high occupying ratio compared to the same structure when assembled to a rotor and a stator. The coil manufacturing method comprises: a fixing step of fixing a first surface, which is one of four surfaces of each coil having a vertical quadrangular cross section, and a second surface adjacent to the first surface to be in contact with a jig; a rolling step of rolling a third surface, which is an opposite surface of the first surface of each coil fixed to the jig, and a fourth surface, which is the remaining surface of the coil and the opposite surface of the second surface, by using a roller; and a winding step of winding each coil to form a coil block having a plurality of coil layers so that each coil can be assembled to the rotor or the stator. The plurality of coil layers are formed to have the same vertical cross-sectional area through the rolling step and the thickness and width of each of partial coil layers corresponding to each turn are formed different from one another.

Description

TECHNICAL FIELD [0001] The present invention relates to a manufacturing method of a coil,

[0001] The present invention relates to a method of manufacturing a coil, in which coils of a special shape having a different thickness and width for each partial region corresponding to each turn are continuously To a method of manufacturing a coil to be machined.

Nowadays, as the research for increasing the efficiency of the electric motor is progressing actively, the improvement of the efficiency of the electric motor and the generator used in the electric automobile and the power generation facility can bring about a great economic effect, so that attention can be remarkable.

Accordingly, as a method for improving the efficiency of the electric motor and the generator, the shape of the coil for improving the drop rate (space factor, coil space factor, or conductor occupying ratio) of the coil wound on the rotor or the stator, Has been steadily continuing.

One common way to increase the coil spot rate is to taper the coil to minimize the space wasted when the coil is assembled to the rotor and stator.

However, tapered coils are typically manufactured by using electrical discharge machining and machining to manufacture coils due to their special shape, and it takes a long time to manufacture by using electric discharge machining and machining, there was.

In addition, discharge machining and machined coils can not ignore the waste time and opportunity cost for materials due to the cutting of the material, and have to go through a separate process to coat the insulator.

Therefore, there is a need to develop a new coil manufacturing method that can solve the problems of conventional coil manufacturing methods.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotor and a stator which are manufactured by continuously machining a coil having a special shape having a different thickness and width for each partial region corresponding to each turn so as to have a relatively high drop- And a method of manufacturing a coil.

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 manufacturing a coil, the method including: forming a first surface, which is one of four sides of each coil having a rectangular vertical cross section, and a second surface adjacent to the first surface, A fixing step of fixing the base plate to the base plate; A rolling step of rolling a third surface, which is an opposite side of the first surface of each of the coils fixed to the jig, and a fourth surface that is the other side and the opposite side of the second surface, using a roller; And a winding step of winding each of the coils to form a coil block having a plurality of coil layers so that the coils can be assembled to a rotor or a stator, And the thickness and the width of each of the partial coil layers corresponding to each turn can be formed differently.

Here, the rolling step may include rolling a first roller for applying pressure to the third surface and a second roller for applying pressure to the fourth surface along the longitudinal direction of each of the coils, rolling the coils, 1 rollers are formed such that when each of the coils is rolled, the thickness of the partial coil layer corresponding to the (n + 1) th turn of the partial coil layer corresponding to the nth turn of the plurality of coil layers The second roller applies a pressure applied to the third surface in such a manner that the pressure applied to the third surface is larger than that of the partial coil layer corresponding to the nth turn of the plurality of coil layers when the respective coils are rolled the pressure applied to the fourth surface may be differently applied according to the transport direction so that the width of the partial coil layer corresponding to the (n + 1) th turn is narrower.

Also, the rolling step may adjust the angle of the rotation axis of the second roller so that the fourth surface may be rolled with a predetermined angle in a direction perpendicular to the longitudinal direction of the respective coils.

At this time, the coil block is formed such that the plurality of coil layers are continuously stacked along the vertical direction, and the width of the partial coil layer is decreased from the upper part to the lower part to be formed into a taper shape having an outer side inclination .

In addition, the width of the coil layer decreases and the thickness of the coil block increases as the coil block moves from the upper part to the lower part, so that the vertical cross-sectional areas of the coil layers in the vertical direction may be the same.

In addition, the coils may be coated or coated with an insulator on all four sides, and the insulator may be coated or coated when rolled through the rolling step.

Meanwhile, a method of manufacturing a coil according to the present invention includes: a transfer step of transferring each coil having a rectangular vertical cross-section in one direction along the longitudinal direction; And a third surface which is the opposite side and the upper surface of the first surface, and a second surface and a fourth surface which are respectively adjacent to the first surface which is the lower surface of the four sides of the respective coils, A pressing step of pressing and pressing the mold with a mold; And a winding step of winding each of the coils to form a coil block having a plurality of coil layers so that the coils can be assembled to a rotor or a stator, And the thickness and the width of each of the partial coil layers corresponding to each turn may be formed differently.

Here, the pressing step may include pressing the second surface, the third surface, and the third surface corresponding to the n-th area of each of the coils entering the n-th (n is a natural number) The n-th order mold is pressed by the n-th order mold on the fourth surface, and when the respective coils are formed into the coil block through the winding step, the n-th order region is divided into the partial coil Layer.

Further, the pressing step may include a step of pressing the n + 1 mold, which is plastic-worked by an n + 1-th mold, to a thickness between the first surface and the third surface of the n-th region of each of the coils, And the second face of the n-th region of the coil, which has been plastic-worked by the n-th order mold, is formed to have a greater thickness between the first surface and the third surface of the car area, The width between the second surface and the fourth surface of the n + 1 < th > -order region, which is plastic-worked by the n + 1-th mold, is narrower than the width.

Further, the pressing step may include pressing the fourth surface so that the fourth surface of each coil can be plastic-worked by a predetermined angle in a direction perpendicular to the longitudinal direction of the respective coils by the mold The inner surface of the mold may be formed as an inclined surface.

The method of manufacturing a coil according to the present invention having the above-described configuration has the following effects.

First, there is an advantage that a coil having a special shape can be manufactured to maximize the dot rate at a low production cost and a high production speed compared with the conventional discharge machining and machining method.

In addition, there is no loss of material due to cutting, and a subsequent process such as coating of an insulator is not required, which simplifies the production process.

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 illustrating a method of manufacturing a coil according to a first embodiment of the present invention.
2 is a view showing each copper wire according to the first embodiment of the present invention.
3 is a view illustrating a fixing step according to the first embodiment of the present invention.
4 to 5 are views showing the rolling step according to the first embodiment of the present invention.
6 to 7 are views showing the shapes of the respective coils processed through the rolling step according to the first embodiment of the present invention.
8 is a view showing a modification of the rolling step according to the first embodiment of the present invention.
FIG. 9 is a view showing a coil block manufactured through the wading process according to the first embodiment of the present invention.
10 is a view illustrating a method of manufacturing a coil according to a second embodiment of the present invention.
11 is a view showing a pressing step according to a second embodiment of the present invention.
12 is a view showing a modification of the pressing step according to the 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 manufacturing a coil according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 9. FIG.

The method of manufacturing a coil according to this embodiment may include a fixing step S1, a rolling step S2, and a winding step S3 as shown in Fig.

The securing step S1 is a process of fixing each coil 10 to the jig 100 and includes a first surface 11 as one of four sides of each coil 10 having a rectangular vertical cross- And the second surface 12 adjacent to the first surface 11 can be fixed in contact with the jig 100 as shown in FIG.

Each of the coils 10 is a raw material of a coil primarily processed through a separate process. Although not shown in the figure, connectors for electrical connection may be provided in both ends along the longitudinal direction.

Accordingly, when a block is formed through the rolling step S2 and the winding step S3 or is directly wound on the rotor or the stator, a subsequent process for electrical connection is not required, so that the entire process can be simplified, Or when the connector is machined in the wired state, it is possible to easily and quickly prepare the tool.

In the case of each coil 10 according to the present embodiment, insulators 20 are coated or coated on all four sides and then rolled through the rolling step S2, so that the insulator 20 is coated or applied Can be maintained.

As will be described later, in the case of the rolling step S2 according to the present embodiment, since the plastic working method in which the cutting of the material is not performed is used, the insulator 20 is formed during the plastic working of each coil 10 through the rolling step S2. Can be rolled together with each coil 10 while maintaining a coated or applied state.

Therefore, according to the method of manufacturing a coil according to the present embodiment, it is possible to omit the coating or coating operation of the insulator 20, which is one of the subsequent processes that are necessarily performed at the time of manufacturing a coil, and simplification of the process becomes possible.

In addition, even when each coil 10 is blocked or wound in a tapered shape in order to increase the spot rate, it is not necessary to worry that uniform application of the insulator 20 due to the special shape of the coil becomes difficult.

The rolling step S2 is a process of plasticizing the respective coils 10 fixed to the jig 100 by using the roller 200. As shown in FIGS. 4 and 5, A third surface 13 which is the opposite side of the first surface 11 of each coil 10 fixed to the second surface 12 and a fourth surface 14 which is the opposite side of the second surface 12, 200).

In this rolling step S2, the first roller 210 for applying pressure to the third surface 13 of each coil 10 and the second roller 220 for applying pressure to the fourth surface 14 are wound around the respective coils 10, Along the longitudinal direction (y) of the coil (10) and can roll each coil (10).

6, when each coil 10 is formed into a coil block having a plurality of coil layers through a winding step S3, which will be described later, the plurality of coils 10, And the pressure applied to the third surface 13 is set so that the thickness of the n + 1 th order region corresponding to the partial coil layer of the (n + 1) th turn is made thicker than the n th order region corresponding to the n th turn partial coil layer May be applied differently according to the transport direction (y) to roll the respective coils (10).

That is, when each coil 10 is formed as a coil block through a subsequent process, which is the most preferentially processed region along the conveying direction (y) of the first roller 210, it forms a partial coil layer of the first turn The coil is processed next to the primary region 10a than the thickness t1 of the primary region 10a of each coil 10 and the secondary region corresponding to the partial coil layer of the second turn 10b may be formed to have a larger thickness t2.

7, when each coil 10 is formed into a coil block having a plurality of coil layers through the winding step S3 after the rolling thereof, the n rollers 220 of the plurality of coil layers n Th order region corresponding to the partial coil layer of the n + 1 < th > turn is narrower than the n-th order region corresponding to the partial coil layer of the first turn, (y), so that each of the coils 10 can be rolled.

That is, when each coil 10 is formed as a coil block through a subsequent process, which is the most preferentially processed region along the conveying direction (y) of the second roller 220, it forms a partial coil layer of the first turn The width w1 of the primary region 10a of each coil 10 is processed next to the primary region 10a and the secondary region 10a corresponding to the partial coil layer of the second turn 10b may be formed to have a smaller width w2.

The thickness t2 and the width w2 of the second region 10b are smaller than the thickness t1 and the width w1 of the first region 10a of the respective coils 10 after the rolling step S2 The thickness t3 and the width w3 of the third region 10c are thicker and narrower than the thickness t2 and the width w2 of the second region 10b, Lt; RTI ID = 0.0 > pattern. ≪ / RTI >

Accordingly, when each coil 10 rolled through the rolling step S2 is blocked through the winding step S3, the thickness and width of each of the partial coil layers corresponding to each turn of the coil layer may be different from each other .

In addition, the vertical direction of all the regions along the entire length including the primary region 10a, the secondary region 10b, and the tertiary region 10c of each coil 10 after the rolling step S2 according to the present embodiment The cross-sectional areas may be formed to be all the same.

This is to have a relatively high spot rate when each coil 10 is mounted to the rotor or stator through a subsequent process, as well as to bring the electrical resistance uniformly for each turn forming the coil layer.

Further, when each coil 10 is processed through the rolling step S2 according to the present embodiment, not only the production speed is excellent but also high productivity can be ensured due to a low production cost, and each coil layer is rolled Because of the high pressure in the process, high density conductors can be produced.

In the winding step S3, each coil 10 is rolled up and formed into a coil block having a plurality of coil layers so that each of the coils 10 processed through the rolling step S2 can be assembled to the rotor or the stator .

Although the winding step S3 is not shown in the drawing, the coil block is formed by winding each coil 10 rolled on the core-shaped jig, and the coil block generated through the wading step S3 is separated And can be assembled to the core of the rotor or stator by a subsequent process.

Although not shown in the drawing in the winding step S3 according to the present embodiment, as described above, the insulators 20 are already coated on the respective coils 10 processed through the rolling step S2 Or the coated state is maintained, it is also possible to use a method of directly winding the core directly on the core of the rotor or the stator.

The coil block formed through the winding step S3 is provided as a single block in which a plurality of coil layers are continuously stacked along the vertical direction, and the coil block corresponding to each turn of the plurality of coil layers in the rolling step S2 Since the areas of the respective coils 10 are gradually thickened but narrowed in width, the entire width of the coil block can be formed into a taper shape having a narrower width from the upper part to the lower part.

The reason why the coil block is formed in a tapered shape is that when the coil block is assembled to the core of the rotor or the stator, the waste space, which is an empty space in which the coil is not occupied in the space between the core and the core, .

8, in the rolling step S2 according to the present embodiment, the fourth surface 14 of each coil 10 fixed to the jig 100 is moved in the longitudinal direction y of each coil 10 The angle of the rotation axis 222 of the second roller 220 is adjusted so that each coil 10 can be rolled so as to be rolled with a predetermined angle? have.

When each coil 10 rolled through the rolling step S2 is blocked through the winding step S3 as shown in Fig. 9, a plurality of coil layers are successively stacked along the vertical direction, The width of the partial coil layer corresponding to each turn decreases from the bottom to the bottom of the coil block, so that the outer slope of the coil block can have a more continuous shape.

As a result, the wasted space between the core and the core is further reduced when the coil block is assembled to the core of the rotor or the stator, as compared with the case where the outer inclined surfaces of the coil block whose width decreases from the upper portion to the lower portion are formed stepwise The drop rate of the coil can be further improved.

As shown in FIG. 9, the coil block 30 manufactured by the method of manufacturing a coil according to the present embodiment has the same structure as that of the partial coil layer 32 corresponding to each turn from the upper portion to the lower portion of the coil block 30 The width and thickness of the partial coil layer 32 can be set on the assumption that the width of the vertical section decreases and the thickness decreases but the vertical cross-sectional areas of the respective partial coil layers 32 are all formed to be the same.

For example, when it is assumed that the first coil layer 32a and the partial coil layer 32 located directly below the uppermost coil layer 32 are the second coil layer 32b, The thickness t2 of the second coil layer 32b is relatively thicker than the thickness t1 of the first coil layer 32a and the thickness t3 of the third coil layer 32c is larger than the thickness t2 of the second coil layer 32a, Can be formed to be thicker relative to the thickness t2 of the first electrode 32b.

The width w2 of the second coil layer 32b is smaller than the width w1 of the first coil layer 32a and the width w3 of the third coil layer 32c is smaller than the width w2 of the second coil layer 32b, Can be formed to be relatively narrow as compared with the width w2 of the protrusion 32b.

At this time, the vertical sectional area value of the first coil layer 32a is w1 * t1, which is equal to w2 * t2 which is the vertical sectional area value of the second coil layer 32b and w3 * t3 which is the vertical sectional area value of the third coil layer 32c have.

Since the thickness and the width of the partial coil layer 32 corresponding to each turn of the plurality of coil layers forming the coil block 30 are different from each other but the vertical cross-sectional areas are all the same, It is possible to produce the coil block 30 having a uniform electric resistance.

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 a low speed and high torque operation range.

Particularly, 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 a motor field of an electric vehicle in which efficiency characteristics at low speeds are very important, It can bring about an increase.

Next, a method of manufacturing a coil according to a second embodiment of the present invention will be described with reference to FIGS. 10 to 12. FIG.

The method of manufacturing a coil according to the present embodiment may include a feeding step S4, a pressing step S5 and a winding step S6 as shown in Fig.

Here, the winding step S6 is technically the same as the winding step S3 of the method of manufacturing a coil according to the first embodiment of the present invention described above, so that a detailed description thereof will be omitted.

Returning to the main matter, the transfer step S4 can transfer each coil 10 having a rectangular vertical cross section in one direction (y) along the longitudinal direction as shown in Fig.

At this time, each of the coils 10 has the same technical features as the respective coils 10 according to the first embodiment of the present invention, and a description thereof will be omitted.

The conveying step S4 may be performed by a carriage or a conveyor that supports and conveys the first side 11, which is the lower one of the four sides of each coil 10, although it is not shown in the figure.

At this time, the structure for supporting and transporting the coils 10 such as the carriage and the conveyor may be made of a material capable of carrying out the plastic working of the respective coils 10 while sufficiently supporting the pressure applied in the pressing step S5.

The pressing step S5 is a step of pressing the second face 12 and the fourth face 14 adjacent to the first face 11 which is the lower face among the four sides of each coil 10 entering in the conveying direction y, And the third side 13, which is the opposite side of the first side and the upper side, can be pressed by the mold 300 and subjected to the plastic working.

In this case, the mold 300 has a structure in which an inner side frame for pressing and forming the second surface 12, the third surface 13, and the fourth surface 14 of each coil 10 is formed in each of the coils 10 And may have a step difference and a width difference for each portion corresponding to the region.

Accordingly, when each of the coils 10 is plastic-worked through the pressing step S5, the plurality of coil layers constituting the coil block 30 (see FIG. 9) have the same vertical cross-sectional areas, The thickness and width of each of the coil layers may be formed differently.

As shown in FIG. 12, the pressing step S5 according to the present embodiment uses a plurality of molds 310 to 330 having different shapes, not one mold 300, The region can be plastic-worked sequentially in the transport direction (y).

More specifically, the second surface 12, which corresponds to the n-th order area of each coil 10 entering the n-th order (where n is a natural number) toward the mold 300 along the conveying direction of each coil 10, The third surface 13 and the fourth surface 14 can be pressed by the n-th mold.

At this time, when each coil 10 is formed as a coil block through the winding step S6, the n-th region becomes a partial coil layer corresponding to the n-th turn of the plurality of coil layers.

The n + 1-th order mold is subjected to plastic working by an n + 1-order mold, which is thicker than the thickness between the first surface 11 and the third surface 13 of the n-th order area of each coil 10, The thickness between the first surface 11 and the third surface 13 of the region can be made thicker.

(N + 1) -th order molded by the n + 1-th mold than the width between the second surface 12 and the fourth surface 14 of the n-th order area of each coil 10 subjected to the plastic working by the n- The width between the second surface 12 and the fourth surface 4 of the region may be formed to be narrower.

The primary area 10a of each coil 10 entering in the first order along the direction of movement of the respective coils 10 entering the mold 300 is pressed by the primary mold 310, And has a predetermined thickness and width according to the shape of the car mold 310.

On the other hand, the secondary region 10b of each coil 10 entering the second order is pressed by the secondary mold 320 and has a relatively thicker thickness and a narrower width than the primary region 10a The vertical cross-sectional area can be formed to be the same.

Likewise, the tertiary region 10c of each coil 10 entering in the third order is pressed by the tertiary mold 330 and has a relatively thicker thickness and a narrower width than the secondary region 10b But the vertical cross-sectional area can also be formed identically.

Through the repetition of this pattern, in the pressing step S5 according to the present embodiment, the total length of the coil 10, including the primary region 10a, the secondary region 10b, and the tertiary region 10c, The vertical cross-sectional area of all regions is the same, but the thickness and width of each region can be formed differently.

In this case, each of the n-th molds 310 to 330 is formed as an inclined surface on the inner side where the fourth surface 14 of each coil 10 is pressed, and each of the molds 310 to 330 The fourth surface 14 of the coil 10 can be inclined by a predetermined angle in the direction perpendicular to the longitudinal direction of each of the coils 10.

Thus, when each coil 10 is blocked through the winding step S6, the coil block has a continuous taper shape, thereby reducing a waste space when the coil block is mounted on the core of the rotor or the stator through a subsequent process It is possible not only to improve the dot rate but also to bring the electric resistance uniformly for each turn forming the coil layer.

Further, each of the coils 10 subjected to the plastic working through the pressing step S5 may be removed from the unnecessary parts such as burrs through a separate trimming process before the winding step S6.

As described above, when each coil 10 is processed through the pressing step S5 according to the second embodiment of the present invention, not only is it excellent in terms of the production rate compared with the conventional discharge machining and cutting, High productivity can be ensured and high density conductors can be produced because each coil layer receives high pressure during the rolling process.

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: Each copper wire
20: Insulator
30: coil block
100: jig
200: Rollers
300: mold

Claims (12)

A fixing step of fixing a first surface, which is one of four sides of each coil, and a second surface, which is adjacent to the first surface, in contact with the jig;
A rolling step of rolling a third surface, which is an opposite side of the first surface of each of the coils fixed to the jig, and a fourth surface that is the other side and the opposite side of the second surface, using a roller; And
A winding step of winding each of the coils by a plurality of coil layers along a longitudinal direction of the core;
/ RTI >
Wherein the plurality of coil layers are formed to have different thicknesses and widths of the partial coil layers corresponding to each turn through the rolling step so as to fill a space between adjacent cores. The method according to claim 1,
Wherein the rolling step comprises:
A first roller for applying pressure to the third surface and a second roller for applying pressure to the fourth surface are moved along the longitudinal direction of the respective coils and the coils are rolled,
The first roller
When each of the coils is rolled, the thickness of the partial coil layer corresponding to the (n + 1) th turn is set to be thicker than the partial coil layer corresponding to the nth turn of the plurality of coil layers (where n is a natural number) The pressure applied to the third surface is applied differently according to the transport direction,
The second roller
The pressure applied to the fourth surface is set such that the width of the partial coil layer corresponding to the (n + 1) th turn is narrower than the partial coil layer corresponding to the nth turn of the plurality of coil layers when the respective coils are rolled In a direction different from the feeding direction. 3. The method of claim 2,
Wherein the rolling step comprises:
And adjusting the angle of the rotation axis of the second roller so that the fourth surface can be rolled with a predetermined angle in a direction perpendicular to the longitudinal direction of each of the coils. The method of claim 3,
The coil block includes:
Wherein the plurality of coil layers are continuously stacked along the vertical direction and the width of the partial coil layer decreases from the upper portion to the lower portion so that the outer side surface is formed in a taper shape having a slope. 5. The method of claim 4,
The coil block includes:
Wherein a width of the partial coil layer is decreased and a thickness thereof is increased from the upper part to the lower part, so that the vertical cross-sectional areas of the plurality of coil layers in the vertical direction are all the same. The method according to claim 1,
Wherein each of the coils includes:
Wherein the insulation is coated or applied on all four sides and the insulation is kept coated or rolled when rolled through the rolling step. A conveying step of conveying each coil having a vertical cross section of a quadrangle in one direction along the longitudinal direction;
And a third surface which is the opposite side and the upper surface of the first surface, and a second surface and a fourth surface which are respectively adjacent to the first surface which is the lower surface of the four sides of the respective coils, A pressing step of pressing and pressing the mold with a mold; And
A winding step of winding each of the coils by a plurality of coil layers along a longitudinal direction of the core;
/ RTI >
Wherein the plurality of coil layers are formed to have different thicknesses and widths of the partial coil layers corresponding to each turn through the pressing step so as to fill a space between adjacent cores. 8. The method of claim 7,
The pressing step includes:
The second face, the third face, and the fourth face corresponding to the n-th region of each of the coils entering the nth order (where n is a natural number) toward the mold in accordance with the feeding direction of the coils the n-th mold is pressed,
And the n-th region is a partial coil layer corresponding to the n-th turn of the plurality of coil layers when each of the coils is formed of the coil block through the winding step. 9. The method of claim 8,
The pressing step includes:
The first surface of the n + 1 < th > -order region sintered by the (n + 1) -th mold relative to the thickness between the first surface and the third surface of the n-th region of each of the coils processed by the n- And the third surface is formed thicker,
And the width of the n-th region of each of the coils processed by the n-th mold is smaller than the width between the second face and the fourth face of the n + And the width between the two surfaces and the fourth surface is made narrower. 10. The method of claim 9,
In the pressing step,
The inner surface of the mold for pressing the fourth surface is pressed so that the fourth surface of each of the coils can be plastic-worked with a predetermined angle in a direction perpendicular to the longitudinal direction of the respective coils by the mold, Wherein the coil is formed of an inclined surface. A fixing step of fixing a first surface, which is one of four sides of each coil, against the jig;
A rolling step of rolling the third surface which is the opposite side of the first surface of each of the coils fixed to the jig by using a roller, and rolling the third surface of each of the coils so as to taper over the entire length of each of the coils; And
A winding step of placing a first surface or a third surface of each of the coils so as to be in surface contact with the winding surface of the core and stacking a plurality of coil layers along the thickness direction of the core;
Wherein the coil is made of a metal. 12. The method of claim 11,
Wherein each of the coils includes a connection portion for connection with an end winding,
Wherein the winding step comprises:
Wherein the connecting portion is positioned between the coil layer and the head of the core after lamination of the coil layer along the thickness direction of the core is completed.

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