WO2012127603A1 - Manufacturing method for cassette coil, manufacturing method for divided stator, and manufacturing method for stator - Google Patents

Abstract

In the present invention, to manufacture a cassette coil by resin molding a coil (25) comprising a flat wire (25a), first the coil (25) is fitted into the cavity (32) of a mold (31). Then, while pressing one axial end of the coil (25) with a pin (33) in the direction opposite the axial direction and toward the center of the coil (25), the coil (25) is resin molded by filling the cavity with resin (41). In this case, the lateral surface of the coil (25) is externally pressed in towards the center of the coil. By assembling the cassette coil (21) manufactured in such a manner to the divided core (11), a divided stator (2) is manufactured. In addition, by assembling in a circular manner a plurality of divided stators (2) manufactured in such a manner, a single stator (1) is manufactured.

Description

Cassette coil manufacturing method, split stator manufacturing method, and stator manufacturing method

The present invention relates to a method of manufacturing a cassette coil formed by resin-molding a coil made of a flat wire, a divided stator provided with the cassette coil, a method of manufacturing a divided stator formed by resin-molding a coil formed of a flat wire, and the divided stator. It is related with the manufacturing method of the stator provided with two or more.

Conventionally, a cassette coil manufactured by resin-molding a coil and a structure of a split stator manufactured by assembling the cassette coil to a split core have been proposed. A structure of one stator manufactured by assembling the divided stators in a plurality of annular shapes has been proposed. By manufacturing a motor using such a cassette coil, a divided stator and a stator, it is possible to reduce the cost and performance of the motor. For example, Patent Documents 1 and 2 disclose the structures of these cassette coils, split stators, and stators.

JP 2006-187162 A JP 2009-254171 A

However, when the cassette coil is manufactured by resin-molding the coil as described above, a part of the coil may be pushed outward due to the pressure of the resin entering between the coil turns. In this case, there is a concern that a poorly filled portion of resin is formed on the side surface of the cassette coil and the coil is exposed. In particular, with respect to the coil 63 formed by winding a rectangular wire in two layers, the resin 62 filled in the mold cavity 61 and the inner layer coil 63A are schematically shown in FIG. The outer layer coil 63B may enter the outer layer coil 63B, and the outer layer coil 63B may be pushed outward. Moreover, even in the case of a coil formed by winding a flat wire in a single layer, when an insulator is assembled at the center of the coil, the same problem as described above arises because the resin enters between the coil and the insulator. There was a fear.

If the cassette coil has a poorly filled portion of the resin as described above, the insulation performance of the coil cannot be secured at that portion. FIG. 20 schematically shows a part of the stator 71 in a plan view. FIG. 21 schematically shows a part of the stator 71 as viewed in the direction of arrow A in FIG. That is, as shown in FIGS. 20 and 21, when the stator 71 is formed by assembling a plurality of annular stators 74 in which the cassette coil 72 is assembled to the divided core 73, the resin is filled between the adjacent cassette coils 72. When the defective portion 75 is adjacent, the insulation resistance between the coils constituting the adjacent cassette coil 72 becomes low.

The above problem is the same when a split stator is manufactured by resin-molding a coil made of a rectangular wire without using a cassette coil.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a cassette coil or a divided stator from being formed with a poorly filled portion of resin and ensure the insulation performance of the coil. A manufacturing method, a manufacturing method of a split stator, and a manufacturing method of a stator are provided.

(1) In order to achieve the above object, a first aspect of the present invention is a method of manufacturing a cassette coil obtained by resin-molding a coil made of a rectangular wire, and the coil is fitted into a cavity of a mold. The purpose is to resin-mold the coil by filling the cavity with resin while holding one end of the coil in the axial direction opposite to the axial direction and toward the inner center of the coil.

According to the configuration of the above (1), when resin molding is performed, the mold cavity is filled with resin while pressing one end in the axial direction of the coil toward the opposite side of the axial direction and the inner center of the coil. In the initial stage of resin filling, it becomes difficult for the resin to enter between the rectangular wires constituting the coil. For this reason, the rectangular wire of the coil is not spread outward by the resin, and it becomes difficult to form a defective filling portion of the cassette coil.

(2) In order to achieve the above object, in the configuration of the above (1), it is preferable to press the side surface of the coil from the outside to the inner center direction.

According to the above configuration (2), in addition to the operation of the above configuration (1), the coil is reliably pressed in the inner direction.

(3) In order to achieve the above object, in the configuration of (2), it is preferable that the position where the side surface of the coil is pressed is asymmetrical in a plan view of the coil.

According to the configuration of (3) above, in addition to the operation of the configuration of (2) above, when a stator is configured by arranging a plurality of split stators including this cassette coil in an annular shape, the cassette coils of adjacent split stators are adjacent. However, the part which was not resin-molded by pressing the coil side face does not come into contact with each other.

(4) In order to achieve the above object, according to a second aspect of the present invention, there is provided a cassette coil manufactured by any one of the manufacturing methods of the above configuration (1) to the above configuration (3) as a yoke portion. The purpose is to manufacture a split stator by assembling to a tooth portion of a split core including a tooth portion.

According to the configuration of (4) above, it is difficult to form a resin poorly filled portion in the resin mold of the cassette coil constituting the split stator.

(5) In order to achieve the above object, a third aspect of the present invention is a method for manufacturing a split stator formed by resin-molding a coil made of a rectangular wire, and the coil is divided into a yoke part and a tooth part. Assemble the assembled coil and the divided core into the mold cavity, and place one end in the axial direction of the coil that does not come into contact with the divided core in the direction opposite to the axial direction and the inner center of the coil. The purpose is to resin-mold the coil by filling the cavity with resin while holding it down.

According to the configuration of (5) above, when the resin molding is performed, the resin is filled into the mold cavity while holding the one axial end of the coil toward the opposite side of the axial direction and the inner center of the coil. In the initial stage of resin filling, it becomes difficult for the resin to enter between the rectangular wires constituting the coil. For this reason, the rectangular wire of the coil is not pushed outward by the resin, and it becomes difficult to form a poorly filled portion of resin in the divided stator.

(6) In order to achieve the above object, according to a fourth aspect of the present invention, there is provided a single stator by assembling a plurality of split stators manufactured by the manufacturing method having the above configuration (4) or (5). The purpose is to manufacture.

According to the configuration of (6) above, in a plurality of divided stators assembled in an annular shape, resin filling defects do not contact each other with respect to cassette coils of adjacent divided stators.

According to the configurations (1) to (3) above, it is possible to prevent the cassette coil from being filled with a resin, and to ensure the insulation performance of the coil.

According to the configuration of (4) above, it is possible to suppress the occurrence of defective products for the divided stator, and to reduce the manufacturing cost of the divided stator.

According to the configuration of (5) above, it is possible to prevent the divided stator from being filled with a resin and to ensure the insulation performance of the coil.

According to the configuration of (6) above, it is possible to suppress the generation of defective products per stator and reduce the manufacturing cost of the stator.

The top view which concerns on 1st Embodiment and which fractures | ruptures and shows a stator partially. The perspective view which shows the division | segmentation stator which concerns on the embodiment and comprises a stator. The perspective view which shows the cassette coil which concerns on the embodiment and comprises a division | segmentation stator. The perspective view which concerns on the same embodiment and shows the insulator before resin molding and the coil set to the insulator. The perspective view which concerns on the embodiment and shows an insulator. (A)-(E) are perspective views showing a series of steps according to the stator manufacturing method according to the embodiment. Sectional drawing which shows the state which concerns on the embodiment and has set the insulator and the coil in the cavity of the metal mold | die. FIG. 8 is a cross-sectional view schematically showing a state where a pin is moved from the state of FIG. 7 according to the embodiment; Sectional drawing which expands and schematically shows the relationship between each pin and the rectangular wire of the upper part of a coil concerning the embodiment. FIG. 9 is a cross-sectional view schematically showing a state in which the cavity is filled with resin from the state of FIG. 8 according to the same embodiment. FIG. 4 is a plan view schematically showing a part of the stator according to the embodiment. FIG. 12 is an arrow A view of FIG. 11 schematically showing a part of the stator according to the embodiment. The perspective view which concerns on 2nd Embodiment and shows roughly the main structure of the insulator which set the coil, and a metal mold | die. The perspective view which concerns on the same embodiment and shows the cassette coil molded. FIG. 4 is a plan view schematically showing a part of the stator according to the embodiment. The arrow A view of FIG. 15 which shows a part of stator according to the embodiment. (A) to (E) are perspective views showing a series of steps related to a stator manufacturing method according to the third embodiment. FIG. 6 is a cross-sectional view schematically showing a state in which the cavity is filled with a resin according to the embodiment. Sectional drawing which concerns on a prior art example and shows the process of resin-molding a coil. The top view which concerns on a prior art example and shows a part of stator schematically. The arrow A view of FIG. 18 which shows a part of stator according to a prior art example schematically.

<First Embodiment>
Hereinafter, a first embodiment in which a method for manufacturing a cassette coil, a method for manufacturing a divided stator, and a method for manufacturing a stator according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of the stator 1 according to this embodiment, with a part (cassette coil portion) cut away. The stator 1 is a component of the motor, and the motor is configured by assembling the rotor inside and covering the outside with a housing. The stator 1 is manufactured by assembling a plurality of divided stators 2 in an annular shape.

FIG. 2 is a perspective view showing one of the divided stators 2 constituting the stator 1. As shown in FIGS. 1 and 2, the split stator 2 includes a split core 11 and a cassette coil 21. The split core 11 includes a yoke part 11a and a tooth part 11b. The split stator 2 is manufactured by assembling the cassette coil 21 to the tooth portion 11 b of the split core 11.

FIG. 3 is a perspective view showing the cassette coil 21 constituting the split stator 2. The cassette coil 21 has a substantially trapezoidal quadrangular pyramid shape, and has a long hole portion 22 in plan view corresponding to the tooth portion 11b of the split core 11 at the center. The cassette coil 21 is configured by a mold resin 23 and an insulator 24 in appearance. The inner wall portion of the hole 22 and the bottom wall portion of the cassette coil 21 are each covered with an insulator 24.

FIG. 4 is a perspective view showing the insulator 24 and the coil 25 set on the insulator 24 before being resin-molded. The coil 25 is formed by winding a rectangular wire 25a in two layers, and includes an inner inner layer coil 25A and an outer outer layer coil 25B. Both end portions of the flat wire 25 a protrude outward at one end portion of the coil 25 to constitute a pair of terminals 26.

FIG. 5 shows the insulator 24 in a perspective view. The insulator 24 includes a rectangular frame-shaped bottom portion 24a and a long cylindrical portion 24b that rises upward from the bottom portion 24a. The cylindrical portion 24b has a substantially square cylindrical shape, and is formed to rise upward from the inner edge of a long hole (not shown) formed in the center of the bottom portion 24a. The insulator 24 is formed of an insulating material in order to ensure its function. A set state shown in FIG. 4 is obtained by assembling the coil 25 to the cylindrical portion 24b of the insulator 24.

Here, a method for manufacturing the stator 1 will be described. 6A to 6E are perspective views showing a series of processes related to the manufacture of the stator 1 in this embodiment.

First, each of the insulator 24, the coil 25, and the split core 11 described above is manufactured in advance.

Next, as shown in FIG. 6 (A), an insulator 24 is prepared, and subsequently, as shown in FIG. 6 (B), the coil 25 is set on the cylindrical portion 24b of the insulator 24.

Next, as shown in FIG. 6C, the cassette coil 21 is manufactured by molding the periphery of the coil 25 shown in FIG. 6B with resin. This molding will be described later in detail.

Next, as shown in FIG. 6D, the divided stator 2 is manufactured by setting the cassette coil 21 shown in FIG.

Next, as shown in FIG. 6 (E), the stator 1 is manufactured by assembling a plurality of divided stators 2 in an annular shape.

Here, the molding shown in FIG. 6C will be described in detail. FIG. 7 is a schematic sectional view showing a state where the insulator 24 and the coil 25 are set in the cavity 32 of the mold 31. FIG. 8 is a schematic sectional view showing a state in which the plurality of pins 33 are moved from the state shown in FIG. The mold 33 includes an upper mold 34, a middle mold 35 and a lower mold 36. The upper die 34 is provided with a plurality of pins 33 for pressing the coil 25 so as to be movable up and down. The plurality of pins 33 are arranged symmetrically in a plan view of the coil 25.

Then, as shown in FIG. 7, the upper die 34, the middle die 35 and the lower die 36 are clamped with the insulator 24 and the coil 25 fitted in the cavity 32. In this state, as shown in FIG. 7, each pin 33 is retracted into the upper mold 34.

Thereafter, as shown in FIG. 8, each pin 33 is moved downward, and each pin 33 moves one end of the coil 25 in the axial direction (the upper portion of the coil 25 in FIG. 8) to the opposite side (in FIG. 8). Press toward the inner side of the coil 25 and the lower side of the coil 25. FIG. 9 is an enlarged schematic view of the relationship between each pin 33 and the rectangular wire 25a at the top of the coil 25. As shown in FIG. 9, a protrusion 33 a having a triangular shape is provided outside the lower end of the pin 33. When the pin 33a moves downward, the oblique side 33aa of the projection 33a hits the edge of the flat wire 25a, and the flat wire 25a is pushed in the inner direction of the coil 25 (the direction of the arrow X). That is, in this embodiment, at the time of resin molding, the rectangular wire 25a is simply pushed in the lower direction (by pressing the flat wire 25a on the upper side of the outer coil 25B from the product pressure direction of the coil 25 with the plurality of pins 33. It is configured to push in the direction of the arrow Y) and the inner center direction (the direction of the arrow X).

Then, the coil 25 is resin-molded by filling the cavity 32 with resin while pressing the upper portion of the outer layer coil 25B with the plurality of pins 33 toward the lower side of the coil 25 and the inner center of the coil 25. FIG. 10 is a schematic sectional view showing a state where the resin 41 is filled into the cavity 32 from the state shown in FIG. In this case, as shown in FIG. 10, the resin 41 filled in the cavity 32 of the mold 31 does not enter between the inner layer coil 25A and the outer layer coil 25B. For this reason, the outer layer coil 25 </ b> B is not spread outward, and it is difficult to form a defective filling portion of the resin 41 in the cassette coil 21.

Thereafter, by opening the upper die 34, the middle die 45 and the lower die 36, the molded cassette coil 21 is obtained as shown in FIG.

FIG. 11 schematically shows a part of the stator 1 in a plan view. FIG. 12 schematically shows a part of the stator 1 as viewed in the direction of arrow A in FIG. In this embodiment, in the stator 1 manufactured by assembling a plurality of split stators 2 in an annular shape, the poorly filled portions of the mold resin 23 are not adjacent between the cassette coils 21 of the adjacent split stators 2 but adjacent to each other. Insulation resistance does not decrease between the cassette coils 21. In FIG. 12, a plurality of circular portions arranged on the front surface of each cassette coil 21 indicate unfilled portions 27 that are not filled with the resin 41 due to the contact of the pins 33 described above.

According to the manufacturing method of the cassette coil 21 of this embodiment described above, the upper part of the outer layer coil 25B among the coils 25 wound on the inner and outer two layers is formed by the plurality of pins 33 during the molding of FIG. The cavity 32 is filled with the resin 41 while being pressed toward the lower side of the coil 25 and toward the inner center of the coil 25. Therefore, at the initial filling stage of the resin 41, the resin 41 is difficult to enter from above between the rectangular wires 25a constituting the coil 25, that is, between the inner layer coil 25A and the outer layer coil 25B. For this reason, the outer layer coil 25 </ b> B is not spread outward, and it is difficult to form a defective filling portion of the resin 41 in the cassette coil 21. As a result, when the cassette coil 21 is manufactured, the occurrence of defective products can be suppressed, and the insulation of the coil 25 by the mold resin 23 can be ensured. Moreover, since the occurrence of defective products can be suppressed for the cassette coil 21, the manufacturing cost of the cassette coil 21 can be reduced.

In this embodiment, the edge of the flat wire 25a at the top of the outer layer coil 25B is pushed from the outside by the oblique side 33aa of the projection 33a of each pin 33, so that the flat wire 25a at the top of the outer layer coil 25B is reliably centered. Pushed in the direction. Therefore, the gap between the inner layer coil 25A and the outer layer coil 25B above the coil 25 can be reliably closed, and the resin 41 is reliably prevented from entering between the inner layer coil 25A and the outer layer coil 25B. Can do.

In this embodiment, the plurality of pins 33 are configured to simply push the rectangular wire 25a at the top of the outer layer coil 25B from the direction in which the coil 25 is accumulated. Therefore, the area for mechanically holding the coil 25 can be reduced, and the fluidity of the resin 41 in the cavity 32 is hardly inhibited by the pins 33. Also in this sense, the occurrence of defective products can be suppressed for the cassette coil 21, and the manufacturing cost of the cassette coil 21 can be reduced.

In this embodiment, the split stator 2 is manufactured by assembling the cassette coil 21 manufactured as described above to the teeth portion 11b of the split core 11. Therefore, the divided stator 2 having no defect in the cassette coil 21 is obtained. For this reason, generation | occurrence | production of inferior goods can be suppressed about the division | segmentation stator 2, and the manufacturing cost of the division | segmentation stator 2 can be reduced.

In this embodiment, one stator 1 is manufactured by assembling a plurality of the divided stators 2 manufactured as described above in a ring shape. Therefore, the stator 1 having no defects in the plurality of divided stators 2 assembled in an annular shape is obtained. For this reason, the resin filling defect part does not adjoin the cassette coil 21 of the adjacent divided stator 2. As a result, insulation can be secured for the coils 25 of the adjacent split stators 2 constituting the stator 1. In this sense, the occurrence of defective products can be suppressed for the stator 1, and the manufacturing cost of the stator 1 can be reduced.

Second Embodiment
Next, a cassette coil manufacturing method, a split stator manufacturing method, and a stator manufacturing method according to a second embodiment of the present invention will be described in detail with reference to the drawings.

In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

FIG. 13 is a perspective view schematically showing an insulator 24 in which a coil 25 is set and a main configuration of a mold in this embodiment. This embodiment differs from the first embodiment in the configuration of the mold. That is, a plurality of push pillars 37 for pushing both side surfaces of the coil 25 are provided in the mold cavity. In this embodiment, the push pillars 37 are arranged so that the position at which the side surface of the coil 25 is pressed is asymmetric in the plan view of the coil 25. That is, two push pillars 37 are arranged on one side of both sides of the coil 25, and one push pillar 37 is arranged on the other side. In this embodiment, a pin (not shown) for pushing the coil 25 downward is provided on the mold in accordance with the arrangement of the push pillars 37.

FIG. 14 is a perspective view showing the cassette coil 21 molded by the mold. FIG. 15 schematically shows a part of the stator 1 constituted by the divided stator 2 using the cassette coil 21 of FIG. 14 in a plan view. FIG. 16 schematically shows a part of the stator 1 as viewed from the direction of arrow A in FIG. As shown in FIG. 14, unfilled portions 27 that are not filled with resin are formed on the side surfaces and the upper surface of the molded cassette coil 21 by contacting the push pillars 37 and the pins. The unfilled portion 27 is disposed so as to be asymmetrical in a plan view of the cassette coil 21. That is, two unfilled portions 27 are disposed on one side of both side surfaces of the cassette coil 21, and one unfilled portion 27 is disposed on the other side.

Therefore, in this embodiment, as shown in FIG. 15 and FIG. 16, in the stator 1 manufactured by assembling a plurality of split stators 2 including the cassette coil 21 in an annular shape, the cassette coils 21 of the adjacent split stators 2 are adjacent to each other. Even so, the unfilled portions 27 of the resin do not contact each other. For this reason, the insulation of the coil 25 can be ensured between the adjacent cassette coils 21.

Other functions and effects in this embodiment are basically the same as those in the first embodiment.

<Third Embodiment>
Next, a third embodiment that embodies a method for manufacturing a split stator and a method for manufacturing a stator according to the present invention will be described in detail with reference to the drawings.

This embodiment is different from the first embodiment in the method of manufacturing the split stator 2. 17A to 17E are perspective views showing a series of steps related to the manufacture of the stator 1 in this embodiment.

First, each of the insulator 24, the coil 25, and the split core 11 is manufactured in advance.

Next, as shown in FIG. 17 (A), an insulator 24 is prepared, and then, as shown in FIG. 17 (B), the split core 11 is assembled to the insulator 24. That is, the tooth portion 11 b of the split core 11 is fitted into the cylindrical portion 24 b of the insulator 24.

Next, as shown in FIG. 17 (C), the coil 25 is set on the cylindrical portion 24b of the insulator 24.

Next, as shown in FIG. 17D, the divided stator 2 is manufactured by molding the periphery of the coil 25 shown in FIG. 17C with resin. This molding will be described later in detail.

Next, as shown in FIG. 17E, the stator 1 is manufactured by assembling a plurality of divided stators 2 in an annular shape.

Here, the molding shown in FIG. 17D will be described in detail. FIG. 18 is a schematic cross-sectional view showing a state where the split core 11, the insulator 24, and the coil 25 are set in the cavity 32 of the mold 31 and then the resin 41 is filled in the cavity 32. 18 is a cross-sectional view similar to FIG.

As shown in FIG. 18, the upper die 34, the middle die 35, and the lower die 36 are clamped with the split core 11, the insulator 24, and the coil 25 fitted in the cavity 32. Then, as shown in FIG. 18, each pin 33 causes one end of the coil 25 in the axial direction (upper part of the coil 25 in FIG. 18) to be opposite to the axial direction (below the coil 25 in FIG. 18) and the coil 25. Press toward the inner center. Then, the coil 25 is resin-molded by filling the cavity 32 with resin while pressing the upper portion of the outer layer coil 25 </ b> B with the plurality of pins 33 toward the lower side of the coil 25 and the inner center of the coil 25.

That is, in the split stator manufacturing method of this embodiment, the coil 25 is assembled to the tooth portion 11b of the split core 11 including the yoke portion 11a and the tooth portion 11b via the insulator 24, and the assembled coil 25, split The core 11 and the insulator 24 are fitted into the cavity 32 of the mold 31, and one axial end portion (upper portion) of the coil 25 that does not contact the yoke portion 11 a (the bottom portion 24 a of the insulator 24) of the split core 11 is opposite to the axial direction. The coil 25 is resin-molded by filling the cavity 32 with the resin 41 while pressing toward the inner side of the coil 25 and the lower side. Also in this case, as shown in FIG. 18, the resin 41 filled in the cavity 32 of the mold 31 does not enter between the inner layer coil 25A and the outer layer coil 25B. For this reason, the outer layer coil 25 </ b> B is not spread outward, and it is difficult to form a defective filling portion of the resin 41 in the cassette coil 21.

Thereafter, the upper die 34, the middle die 45, and the lower die 36 are opened to obtain the divided stator 2 that is resin-molded as shown in FIG. 17 (D).

According to the manufacturing method of the split stator 2 of this embodiment described above, one end of the coil 25 in the axial direction (upper part of the coil 25) is directed to the opposite side of the axial direction (below the coil 25) and the inner center of the coil 25. Since the resin 41 is filled into the cavity 32 of the mold 31 while being pressed, the resin is difficult to enter between the rectangular wires 25a constituting the coil 25 at the initial stage of filling the resin. For this reason, the rectangular wire 25a of the coil 25 is not pushed outward by the resin 41, and it becomes difficult to form a poorly filled resin portion in the split stator 2. As a result, it is possible to prevent the division stator 2 from being poorly filled with resin, and to ensure the insulation performance of the coil 25. Thereby, generation | occurrence | production of inferior goods can be suppressed about the division | segmentation stator 2, and the manufacturing cost of the division | segmentation stator 2 can be reduced.

In this embodiment, one stator 1 is manufactured by assembling a plurality of the divided stators 2 manufactured as described above in a ring shape. Therefore, the stator 1 having no defects in the plurality of divided stators 2 assembled in an annular shape is obtained. For this reason, the resin filling defect part does not adjoin the cassette coil 21 of the adjacent divided stator 2. As a result, insulation can be secured for the coils 25 of the adjacent split stators 2 constituting the stator 1. In this sense, the occurrence of defective products can be suppressed for the stator 1, and the manufacturing cost of the stator 1 can be reduced.

In addition, this invention is not limited to each said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.

For example, in the first embodiment and the third embodiment, the position where the coil 25 is pressed by the plurality of pins 33 is left-right symmetric in the plan view of the coil 25, but the pressed position is left-right asymmetric in the plan view. Also good.

In each of the above embodiments, the rectangular wire 25a is wound in two layers, and the coil 25 including the inner inner layer coil 25A and the outer outer layer coil 25B is used. However, in the case of using the same insulator as in each of the above embodiments A coil in which a flat wire is wound in a single layer can also be used. In this case, it is possible to prevent the resin from entering between the coil and the insulator, and the same effects as those of the above embodiments can be obtained.

The present invention can be used for manufacturing a motor.

DESCRIPTION OF SYMBOLS 1 Stator 2 Split stator 11 Split core 21 Cassette coil 25 Coil 25a Flat wire 25A Inner layer coil 25B Outer layer coil 27 Unfilled part 31 Mold 32 Cavity 33 Pin 33a Protrusion 33aa Inclined side 37 Push column 41 Resin

Claims (6)

1. A method for producing a cassette coil obtained by resin molding a coil comprising a flat wire,
   The coil is inserted into a cavity of a mold, and the coil is filled with resin while pressing one end in the axial direction of the coil toward the opposite side of the axial direction and the inner center of the coil. A method for producing a cassette coil, comprising resin molding.
2. The method for manufacturing a cassette coil according to claim 1, wherein a side surface of the coil is pressed from the outside toward the inner center.
3. 3. The method of manufacturing a cassette coil according to claim 2, wherein a position at which the side surface of the coil is pressed is asymmetrical in a plan view of the coil.
4. A split stator is manufactured by assembling the cassette coil manufactured by the manufacturing method according to any one of claims 1 to 3 to the tooth portion of a split core including a yoke portion and a tooth portion. Stator manufacturing method.
5. A method of manufacturing a split stator obtained by resin molding a coil made of a flat wire,
   The coil is assembled to the tooth portion of a split core including a yoke portion and a tooth portion, the assembled coil and the split core are fitted into a cavity of a mold, and the axial direction of the coil that does not contact the split core A method of manufacturing a split stator, wherein the coil is resin-molded by filling the cavity with resin while pressing one end of the coil toward the opposite side of the axial direction and the inner center direction of the coil.
6. A method for manufacturing a stator, wherein one stator is manufactured by assembling a plurality of divided stators manufactured by the manufacturing method according to claim 4 or 5.

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