JP2005086950A - Stator core and its manufacturing method, and slot-insulating resin mold film and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core superior in electric insulation performance and a manufacturing method therefor, and a slot-insulating resin mold film. <P>SOLUTION: The stator core comprises a stator core body 2, and an insulating part 4 that electrically insulates a coil inserted into a slot 25 and and the stator body 2. The insulating part 4 is composed of the resin mold film 41 that covers the internal wall face of the slot 25, and a resin mold membrane 42 that covers both end faces in the axial direction of the stator core 2. The resin mold film 41 comprises: a nearly U-shaped insertion part 411 that faces the internal wall face of the slot 25; a flange 412 that is protruded from the slot 25 and made to approximate to both the end faces of the stator core 2 at both ends of the insertion part 411; and a rising part 413 that is bent toward the axial direction from the external peripheral end of the flange 412. The resin mold membrane 42 is arranged so as to cover the flange 412 and the rising part 413. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stator core having an insulating portion for obtaining electrical insulation between a coil attached to the stator core and the stator core, a manufacturing method thereof, a resin molded film for insulating a slot portion constituting the insulating portion, and the method It relates to a manufacturing method.

  In a stator core used for a rotary electric motor such as an electric motor, a coil formed by winding a wire around the slot is inserted and disposed. Each wire that constitutes the coil is covered with an electrically insulating resin to ensure electrical insulation, but in order to obtain more sufficient electrical insulation, an insulation treatment is applied to the portion of the stator core where the coil contacts. Is usually applied.

Examples of conventional stator core insulation treatment include, for example, a method in which a sheet-like insulating paper having electrical insulation is disposed in a slot of the stator core, and a molding method in which almost the entire surface of the stator core is coated with a synthetic resin having electrical insulation. There is. The molding method is often used in the case of a concentrated winding structure in which one coil is attached to each tooth portion of the stator core. In the case of distributed winding in which each coil is mounted so as to straddle a plurality of tooth portions, a molding method is not so much used.
As an insulating method using the above insulating paper, for example, there is one disclosed in Patent Document 1 described later.

By the way, in the molding method, since the resin mold film is formed so as to cover both end faces of the stator core and cover the entire circumference of the tooth portion, it is advantageous in insulation characteristics.
However, when the axial length of the stator core is long, that is, when the lamination thickness of the steel plates constituting the stator core is thick, a molding process that causes the synthetic resin to flow over the entire inner wall surface of the slot that faces the slot portion that is the side surface of the tooth portion. Is difficult to do. In addition, if the resin mold film to be formed is sufficiently thick, the fluidity of the synthetic resin is improved, and it becomes possible to form the resin mold film on the entire inner wall surface of the slot. Is not preferable. Therefore, when the axial length of the stator core is long, it is difficult to apply the molding method.

  Further, in the insulating method using insulating paper, the insulating paper is molded and inserted. However, it is difficult to cover the entire axial end faces of the stator core body and the entire inner wall surface of the slot facing the slot portion. . Therefore, there may be a case where a sufficient creepage distance for preventing the occurrence of so-called creeping current cannot be secured.

JP 7-75273 A

  The present invention has been made in view of such a conventional problem, and can be applied to a molding method even when the axial length of the stator core is long. The stator core is excellent in electrical insulation, a method for manufacturing the same, and slot portion insulation. An object of the present invention is to provide a resin molded film for use.

A first invention includes a stator core body including a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion as a base end, and a slot portion formed between the teeth portions. And a stator core having an insulating portion for achieving electrical insulation between the coil inserted into the slot portion and the stator core body,
The insulating portion comprises a resin molded film that covers the inner wall surface of the slot portion, and a resin mold film that covers both axial end surfaces of the stator core body,
The resin molded film includes an insertion portion having a substantially U-shaped cross section facing an inner wall surface of the slot portion, and a flange that protrudes from the slot portion at both ends of the insertion portion and is bent along both end surfaces of the stator core body. And an upright portion bent in the axial direction from the outer peripheral end of the flange portion,
The resin mold coating is disposed on the stator core so as to cover the flange portion and the standing portion (Claim 1).

  As described above, the stator core of the present invention includes a stator core body and an insulating portion provided on the stator core body, and the insulating portion is constituted by the resin molded film and the resin mold film having the specific shape. As a result, the stator core can have excellent insulation characteristics with respect to the coil inserted and disposed in the slot portion.

  That is, the resin molding film is inserted into the slot portion of the stator core main body for electrical insulation. Therefore, it is not necessary to allow the synthetic resin for the resin mold to enter the slot portion, and it is possible to sufficiently ensure the insulating characteristics in the slot portion regardless of the resin moldability. Therefore, the insulation characteristics are not affected by the axial length of the stator core.

  The resin molded film includes the flange portion and the standing portion bent from the flange portion. And the said resin mold membrane | film | coat is formed so that this flange part and a standing part may be covered. Therefore, the bonding between the resin molded film for insulating the slot portion and the resin mold film for insulating the axial end surface of the stator core body can be strengthened by the presence of the bent shape, thereby further enhancing the electrical insulation effect. be able to.

  Furthermore, since the resin molded film has the bent shape, even if a gap or the like occurs in the joint portion between the resin molded film and the resin mold film, the so-called creepage distance is the length of the flange portion. Therefore, the distance obtained by adding twice the height of the standing portion can be stably maintained.

  As described above, according to the present invention, it is possible to provide a stator core that can be applied with the molding method even when the axial length of the stator core is long and that is excellent in electrical insulation.

A second invention is a stator core body comprising a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion as a base end, and a slot portion formed between the teeth portions. And a method of manufacturing a stator core having a coil inserted into the slot portion and an insulating portion for achieving electrical insulation between the stator core body,
An insertion portion formed in a substantially U-shaped cross section so as to face the inner wall surface of the slot portion, a flange portion bent outward at both ends of the insertion portion, and an axial direction from the outer peripheral end of the flange portion Prepare a resin molded film having a bent standing part,
The resin molded film is inserted into the slot portion of the stator core body, the inner wall surface of the slot portion is covered with the insertion portion, and the flange portions are opposed to both end faces of the stator core body,
The stator core manufacturing method is characterized in that a resin mold film is formed so as to cover both end surfaces of the stator core body in the axial direction and to cover the flange portion and the standing portion of the resin molded film. ).

In the stator core manufacturing method of the present invention, the resin mold film is formed after the resin molded film having the specific shape is inserted and arranged in the slot portion. Thereby, the stator core excellent in electrical insulation of the first invention described above can be obtained.
Moreover, when forming the said resin mold membrane | film | coat, it forms so that the flange part and standing part of the said resin molding film may be covered. Thereby, joining with a resin molding film and a resin mold membrane | film | coat can be strengthened, and electrical insulation can be improved.

A third invention includes a stator core body including a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion, and a slot portion formed between the teeth portions. A resin molded film for insulating a slot portion disposed in the slot portion in which the insertion portion is formed in a substantially U-shaped cross section so as to face the inner wall surface of the slot portion;
Flange portions bent outward at both ends of the insertion portion;
A resin molded film for insulating a slot portion, characterized by having a standing portion bent in the axial direction from the outer peripheral end of the flange portion.

  The resin-molded film of the present invention can be used in the first and second inventions described above, and includes at least three characteristic portions such as the insertion portion, the flange portion, and the standing portion. Thereby, the excellent effect mentioned above can be acquired.

A fourth invention is a stator core body comprising a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion as a base end, and a slot portion formed between the teeth portions. And an insertion portion formed in a substantially U-shaped cross section so as to face the inner wall surface of the slot portion, and a flange portion bent outward at both ends of the insertion portion And a method of manufacturing a resin molded film for insulating a slot portion having an upright portion bent in an axial direction from an outer peripheral end of the flange portion,
A groove-shaped first recess for forming the outer surface of the insertion portion, a flange outer surface forming surface extending in a direction perpendicular to the longitudinal direction of the first recess at both ends of the first recess, and the flange outer surface forming surface A lower mold having a standing portion outer surface forming surface extending from the outer peripheral end in the same direction as the longitudinal direction of the first recess;
A first protrusion provided to be inserted into the first recess, and a flange inner surface formed so as to face the flange outer surface forming surface via a predetermined clearance at both ends of the first protrusion, Using an upper mold having the upright portion outer surface forming surface and the upright portion inner surface forming surface provided so as to face each other through a predetermined clearance,
And both the said lower mold | type and the said upper mold | type are divided | segmented into two in the longitudinal direction center part, and have a length adjustment means to adjust the space | interval of both, The said length adjustment means, According to the axial length of the stator core body to which the resin molded film is to be mounted, the interval is configured to be adjustable,
The spacing is adjusted according to the axial length of the stator core body, and the material is placed between the lower mold and the upper mold in an environment where predetermined heat is applied to the material made of a substantially rectangular resin film. By sandwiching, the insertion portion having a substantially U-shaped cross section is formed between the first recess and the first protrusion, and the flange portion is formed between the flange outer surface forming surface and the flange inner surface forming surface. And forming the upright portion between the upright portion outer surface forming surface and the upright portion inner surface forming surface. Item 10).

  In the method for producing a resin molded film of the present invention, the lower mold having the first recess, the flange outer surface forming surface and the standing portion outer surface forming surface, the first protrusion, the flange inner surface forming surface and the standing portion inner surface. The above-described upper mold having the formation surface is used. Thereby, the said resin molding film which has an insertion part, a flange part, and an erecting part can be easily produced from a substantially square resin film as a raw material.

Further, each of the lower mold and the upper mold is divided into two at the longitudinal central portion, and has a length adjusting means for adjusting the distance between the two, the length adjusting means, The distance is adjustable in accordance with the axial length of the stator core body to which the resin molded film is to be mounted. Therefore, by using the length adjusting means, it is possible to easily produce a resin molded film having a length dimension optimal for the axial length of the stator core body to which the resin molded film is to be mounted.
In addition, as the length adjusting means, it is possible to adopt the structures shown in the embodiments described later and other various structures.

  In the first invention, it is preferable that the flange portion of the resin molded film has a width dimension that is substantially half the thickness of the tooth portion. In this case, the standing portions of the resin molded film inserted and arranged in the adjacent slot portions can be connected to each other. Thereby, the end surface of teeth can be reliably covered with the said resin molding film. Therefore, the electrical insulation effect can be further enhanced.

Moreover, it is preferable that the standing portions in the resin molded film inserted and arranged in the adjacent slot portions are joined to each other (Claim 3).
In this case, the arrangement state of the resin molded film can be further strengthened, and the electrical insulation can be further improved.

  Next, in the second invention, the resin molded film is formed so as to have the insertion portion having a length corresponding to the axial dimension of the stator core body after the stator core body has been manufactured. It is preferable to use (Claim 5). Since the stator core body is manufactured by stacking a large number of silicon steel plates or the like, variations in axial length are likely to occur. Therefore, instead of preparing the resin molded film in advance, it is possible to obtain a resin molded film having an optimal size by preparing the resin molded film according to the axial dimension after the stator core body is completed. it can.

  On the other hand, when the resin molded film is used to form the resin mold film, the resin molded film having the insertion portion with a margin for absorbing the axial dimension variation of the stator core body is used. It is also possible to perform the margin of the inserted portion inserted in a state of being offset toward one end face side of the stator core body. In this case, it is not possible to use a resin molded film having the optimum dimensions for all the stator core bodies, but by forming the resin mold film in a state where the margin is shifted to one end surface side. The manufacturing method can be simplified, and the entire axial length including the resin mold film can be made uniform (see the examples).

  In addition, it is preferable that the resin molding film is inserted and disposed in the slot portion and then the adjacent standing portions are joined to each other (Claim 7). In this case, the arrangement of the resin molded film can be made strong and stable, and the subsequent formation of the resin mold film can be facilitated. Furthermore, the electrical insulation in the obtained stator core can be further enhanced.

  Next, in the third invention, it is preferable that the flange portion has a width dimension that is substantially half of the thickness of the tooth portion. In this case, as described above, it becomes possible to join the standing portions of the resin molded film inserted and arranged in adjacent slot portions, and the above-described excellent effects can be obtained.

(Example 1)
A stator core, a resin molded film, and a manufacturing method thereof according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the stator core 1 of this example includes a ring-shaped yoke portion 20, a plurality of teeth portions 22 projecting radially inward from the yoke portion 20 as a base end, and the teeth portions 22. The stator core has a stator core body 2 having a slot portion 25 formed, and an insulating portion 4 for achieving electrical insulation between the coil inserted into the slot portion 25 and the stator core body 2.

As shown in FIG. 2, the insulating portion 4 includes a resin molded film 41 that covers the inner wall surface of the slot portion 25, and a resin mold film 42 that covers both axial end surfaces of the stator core body.
The resin-molded film 41 has an insertion portion 411 having a substantially U-shaped cross section facing the inner wall surface of the slot portion 25, and protrudes from the slot portion 25 at both ends of the insertion portion 411 to approach both end surfaces of the stator core body 2. The flange portion 412 is bent in this manner, and the standing portion 413 is bent from the outer peripheral end of the flange portion 412 in the axial direction. The resin mold film 42 is disposed so as to cover the flange portion 412 and the standing portion 413.

This will be described in more detail below.
As shown in FIG. 1, the stator core body 2 is formed by laminating a large number of silicon steel plates punched into a ring shape. As described above, the stator core body 2 has a ring-shaped yoke portion 20 and has a yoke portion 20 as a base end. A plurality of teeth portions 22 projecting on the inner peripheral side in the direction and a slot portion 25 formed between the teeth portions 22 are provided.
In order to provide the insulating portion 4 in the stator core body 2 having such a structure, in this example, first, as shown in FIGS. 3 to 5, the resin molded film 41 was produced.

  The resin molded film 41 was produced using the lower mold 5 and the upper mold 6 as shown in FIGS. As shown in the figure, the lower mold 5 spreads in a direction perpendicular to the longitudinal direction of the first recess 51 at both ends of the first recess 51 and a groove-shaped first recess 51 for forming the outer surface of the insertion portion 411. The flange outer surface forming surface 52 and the standing portion outer surface forming surface 53 extending from the outer peripheral end of the flange outer surface forming surface 52 in the same direction as the longitudinal direction of the first recess 51 are provided.

  Further, as shown in the figure, the lower mold 5 is divided into two portions 501 and 502 at the center in the longitudinal direction. And the length adjustment means 55 which adjusts the space | interval L1 of both 501 and 502 is provided. The length adjusting means 55 is configured to be able to adjust the interval L1 according to the axial length of the stator core body 2 to which the resin molded film 41 is to be mounted. Specifically, the length adjusting means 55 includes a support portion 56 provided with a threaded hole portion 561, a shaft 58 having a threaded portion 581 engaged with the threaded hole portion 561, and the shaft 58. And a drive unit 57 to be driven. The support portion 56 is joined to one portion 501 via a bracket 565, and the drive portion 57 is joined to the other portion 502 via a bracket 575. The drive unit 57 rotates the shaft 58 in one direction to reduce the distance L1, and the rotation in the opposite direction increases the distance L1.

  Further, as shown in the figure, the upper mold 6 includes a first protrusion 61 provided to be inserted into the first recess 51 of the lower mold 5 with a predetermined clearance, and the flange at both ends of the first protrusion 61. Flange inner surface forming surface 62 provided so as to face the outer surface forming surface 52 via a predetermined clearance, and standing portion inner surface formation provided so as to face the standing portion outer surface forming surface 53 via a predetermined clearance. And a surface 63.

  The upper mold 6 is also divided into two parts 601 and 602 at the center in the longitudinal direction, as described above. And the length adjustment means 65 which adjusts the space | interval L2 of both 601 and 602 is provided. The length adjusting means 55 is configured to be able to adjust the interval L2 in accordance with the axial length of the stator core body 2 to which the resin molded film 41 is to be mounted. Specifically, the length adjusting means 65 includes a support portion 66 provided with a threaded hole 661, a shaft 68 having a threaded portion 681 engaged with the threaded hole 661, and the shaft 68 rotated. And a driving unit 67 to be driven. The support portion 66 is joined to one portion 601 via a bracket 665, and the drive portion 67 is joined to the other portion 602 via a bracket 675. The distance L2 is shortened by rotating the shaft 68 in one direction by the drive unit 67, and the distance L2 is increased by rotating in the reverse direction.

  In forming the resin molded film 41 using the lower mold 5 and the upper mold 6 having such a configuration, first, after the production of the stator core body 2 is completed, a length corresponding to the axial dimension of the stator core body 2 is obtained. The length adjustment means 55 and 65 are moved in accordance with the measured values, and the distances L1 and L2 in the lower mold 5 and the upper mold 6 are formed so that the insertion portion 411 having the optimum length is formed. Adjust.

  Also, a substantially square resin film 410 (FIGS. 3 and 4) is prepared. In this example, the material is PEN (polyethylene naphthalate) and the thickness is 0.25 mm. In addition, it is possible to change the material of the resin film to PET (polyethylene terephthalate) or other thermoplastic resin, and the thickness can be selected in a range of 0.08 mm or more. If the thickness is less than 0.08 mm, there is a problem of film, blurring, and pinholes during molding. On the other hand, if the thickness is too thick, the number of coil wires that can be inserted into the slot is reduced. is there.

  Next, in order to obtain an environment in which predetermined heat is applied to the rectangular resin film 410, both or one of the lower mold 5 and the upper mold 6 is heated in advance. Then, a resin film 410 as a material is sandwiched between the lower mold 5 and the mold 6. Accordingly, the insertion portion 411 having a substantially U-shaped cross section is formed between the first recess 51 and the first protrusion 61, and the flange portion 412 is formed between the flange outer surface forming surface 52 and the flange inner surface forming surface 62. The standing portion 413 can be formed between the standing portion outer surface forming surface 53 and the standing portion inner surface forming surface 63.

  That is, as shown in FIG. 5, the insertion portion 411 formed in a substantially U-shaped cross section so as to face the inner wall surface of the slot portion 25, the flange portion 412 bent outward at both ends of the insertion portion 411, and the flange portion A resin molded film 41 having a standing portion 413 bent in the axial direction from the outer peripheral end of 412 is obtained. In this example, the width w of the flange portion 412 is adjusted to be approximately half the thickness of the tooth portion 22 of the stator core body 2.

  Next, as shown in FIGS. 6 and 7, the resin molding film 41 is inserted into the slot portion 25 of the stator core body 2, the inner wall surface of the slot portion 25 is covered with the insertion portion 411, and the flange portion 412 is covered with the stator core body 2. Face to both end faces. This operation is performed for all the slot portions 25.

  As shown in FIG. 7, the inserted resin mold film 411 is often positioned such that its flange portion 412 is away from the end surface of the stator core body 2. This may be the case where the resin mold film 411 has already been formed at the time of molding or the case where it is deformed by insertion. In order to improve such a state more preferably, in this example, after the resin molded film 41 is inserted and arranged in the slot portion 25, the adjacent standing portions 413 are welded to each other. Specifically, as shown in FIG. 8, the two standing portions 413 to be joined are sandwiched by a welding machine 7 having a pair of vibrators 71 and 72, and joined by applying vibration. As a result, as shown in FIG. 9, a state in which the standing portions 413 in the resin molded film 41 inserted and arranged in the adjacent slot portions 25 are joined to each other is obtained.

  Next, as shown in FIG. 10, a resin mold film 42 is formed so as to cover both end surfaces of the stator core body in the axial direction and cover the flange portion 412 and the standing portion 413 of the resin molded film 41. The resin mold film 42 is disposed on both end surfaces of the stator core body 2, but is not provided on the outermost peripheral portion 209 of the yoke portion 20 because of the mold type. Moreover, the insulation of the part is substantially unnecessary. Further, a resin mold film 42 is provided on the entire end surface of the tooth 22, and the flange portion 412 and the standing portion 413 are completely covered with the resin mold film 42.

  As described above, the stator core 1 obtained in this example is composed of the stator core body 2 and the insulating portion 4 provided on the stator core body 2 as shown in FIGS. A resin molded film 41 having a shape and a resin mold film 42 are included. The resin molding film 41 is inserted into the slot portion 25 of the stator core body 2 for electrical insulation. Therefore, it is not necessary to allow the synthetic resin for the resin mold to enter the slot portion 25, and the insulating characteristics in the slot portion 25 can be sufficiently ensured regardless of the resin moldability. Therefore, the insulation characteristics are not affected by the axial length of the stator core 1.

  The resin molded film 41 has a flange portion 412 and a standing portion 413 bent from the flange portion 412. A resin mold film 42 is formed so as to cover the flange portion 412 and the standing portion 413. Therefore, the bond between the resin molded film 41 for insulating the slot portion and the resin mold film 42 for insulating the axial end surface of the stator core body 2 can be strengthened by the presence of the bent shape, and the electrical The insulation effect can be further enhanced.

  Furthermore, since the resin molded film 42 has the above bent shape, even if a gap or the like occurs in the joint portion between the resin molded film 41 and the resin mold film 42, the so-called creepage distance is set to the flange portion 412. Thus, the distance obtained by adding twice the height of the erected portion 413 and the height of the standing portion 413 can stably maintain the insulating effect.

  Moreover, in this example, the width dimension of the flange part 412 in the said resin molding film 41 is made into the width dimension of the half of the thickness of the teeth part 22. FIG. Thus, the standing portions 413 are joined to each other. Thereby, while being able to make the arrangement | positioning state of the resin molding film 41 more rigid, electrical insulation can be improved more.

  Further, in the method of manufacturing the resin molded film 41 in this example, as described above, the lower part having the length adjusting means 55 and 65 that are divided into two at the central portion in the longitudinal direction and adjust the distances L1 and L2 between the two. It manufactures using the type | mold 5 and the upper mold | type 6, and adjusts the said space | intervals L1 and L2 with the axial direction length of the stator core main body 2 which should mount the resin molding film 41. FIG. Thereby, the resin molded film 41 having an optimal length dimension can be easily manufactured, and the stator core 1 having a stable structure can be easily manufactured.

(Example 2)
In this example, as shown in FIGS. 12-21, the manufacturing method of the resin molding film 41 in Example 1 is changed, and the resin molding film 41 has a margin for absorbing the variation in the axial dimension of the stator core body 2. It is an example using what has the insertion part 411 provided with the allowance 49 (FIG. 21).

  As shown in FIGS. 12 and 13, in manufacturing the resin molded film 41, the first concave portion 51 and the flange outer surface forming surfaces 52 and 53 that are the same as those in the first embodiment are provided, but the bottom of the integral type that is not divided at the center. A mold 500 and an integrated upper mold 600 having a first protrusion 61, an inner surface forming surface 62, and an upright portion outer surface forming surface 53 but not divided at the center are used. Then, the resin molded film 41 having a certain length is always formed in consideration of the margin.

In forming the resin mold film 42, as shown in FIGS. 16 to 20, two types of lower molds (first resin mold lower mold 81 and second resin mold lower mold 82) and one type of upper mold are used. (Resin mold upper mold 9) is used.
As shown in FIG. 16, the first resin mold lower die 81 has a depth corresponding to the height of the standing portion 413 of the resin molded film 41 in the center and a diameter to the vicinity of the outer peripheral end of the yoke portion 20 in the stator core body 2. And a contact portion 812 that contacts the yoke portion 20 and the upper die 9 of the stator core body 2.
As shown in FIG. 19, the second resin mold lower mold 82 has a depression 820 that is deeper than the depression 810 in the first resin mold lower mold 81 and has a diameter larger than that of the yoke portion 20 of the stator core body 2. In addition, a contact portion 822 that contacts the upper mold 9 is provided around the periphery.

  As shown in FIG. 16, the resin mold upper die 9 has a cylindrical outer wall portion 91 that surrounds the outer periphery of the stator core body 2 and an upper bottom portion 92 that closes the upper end thereof. On the other hand, part or all of the outer wall portion 91 may be provided on the contact portions 812 and 822 of the lower molds 81 and 82. At the center of the inner surface of the upper bottom portion 92, there is provided a protruding portion 93 provided with an insertion piece portion (not shown) that is inserted into the inner peripheral portion of the stator core body 2 and inserted into all the slot portions 25. A cavity portion 95 for introducing resin through a gate 94 is provided around the protruding portion 93. As shown in FIG. 17, the cavity portion 95 faces the end surface of the stator core body 2 and is sized to accommodate the margin allowance 49 of the insertion portion 411 of the resin molded film 41, the flange portion, and the standing portion 413. It is. Further, around the cavity portion 95, a holding portion 962 that is disposed so as to be able to advance and retreat by a spring 961 and that abuts in the vicinity of the outer peripheral end of the yoke portion 20 on the end surface of the stator core body 2 is formed.

  When the stator core 1 is manufactured using the first resin mold lower mold 81, the second resin mold lower mold 81, and the resin mold upper mold 9, as shown in FIGS. 14 and 15, The resin molding film 41 having the margin 49 is inserted into all the slot portions 25 from the inner peripheral side.

Next, as shown in FIGS. 16 and 17, one end surface of the stator core body 2 to which the resin molded film 41 is attached is directed to the first resin mold lower die 81, and the other end surface is directed to the upper bottom portion 93 of the resin mold upper die 9. The stator core body 2 is sandwiched between the two. As a result, as shown in FIG. 17, the resin molded film 41 inserted in the recess 810 is adjusted in position in the longitudinal direction, and the margin 49 is all shifted upward, and is accommodated in the cavity portion 95. .
In this state, by injecting synthetic resin for the resin mold film 42 from the gate 94 to the cavity portion 95, the resin mold film 42 on the end face is formed.

  Next, as shown in FIGS. 18 to 20, after the first resin mold lower mold 81 and the resin mold upper mold 9 are opened (FIG. 18), the stator core body 2 is reversed and the second resin mold is opened. This is sandwiched between the lower mold 82 and the resin mold upper mold 9 (FIGS. 19 and 20). As a result, as shown in FIG. 20, the resin mold film 42 that has already been formed and covers the resin mold film 41 with the margin 49 is located in the recess 820 of the second resin mold lower mold 82, The end face on the side where the resin mold film is not yet formed is in a state of being accommodated in the cavity portion 95. In this state, by injecting the synthetic resin for the resin mold film 42 from the gate 94 to the cavity portion 95, the resin mold film 42 on the end face is also formed. Thereby, all of the insulating portions 4 are formed, and the stator core 1 is completed.

  Here, in this example, the first mold is formed so as to cover the margin allowance 49 even when the distance from the recess 810 to the cavity portion 95 is constant and the axial length of the stator core body 2 varies. The position of the tip surface in the axial direction of the resin mold film 42 is always constant. Similarly, in the second mold, the distance from the recess 820 to the cavity portion 95 is constant, and even if the axial length of the stator core body 2 varies, the axial direction of the resin mold film 42 that has already been formed. The distance from the tip surface to the cavity 95 is constant. Therefore, the position of the tip end surface in the axial direction of the resin mold film 42 formed on the side without the allowance 49 is always constant. Therefore, in the stator core 1 obtained by this example, even if the axial length of the stator core main body 2 varies, the distance between the surfaces of the resin mold films 42 formed on both end faces can be kept constant.

The top view of the stator core in Example 1. FIG. Sectional drawing of the teeth part of a stator core in Example 1 (AA arrow directional cross-sectional view of FIG. 1). The front view which shows the structure of the lower mold | type for forming the resin molding film in Example 1, and an upper mold | type. The side view which shows the structure of the lower mold | type for forming the resin molding film in Example 1, and an upper mold | type. The perspective view of the resin molding film in Example 1. FIG. FIG. 3 is an explanatory diagram illustrating a state where a resin molded film is inserted into the stator core body in the first embodiment. FIG. 3 is an explanatory view showing a state immediately after a resin molded film is inserted into a slot portion of a stator core body in the first embodiment. Explanatory drawing which shows the state which adjoins the standing part of the resin molding film inserted in the slot part in Example 1. FIG. Explanatory drawing which shows the state in which the resin molding film was inserted in the slot part in Example 1, and the joining of standing parts was completed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external appearance explanatory view showing a state in which a resin mold film is formed on both axial end surfaces of a stator core body in Example 1. Sectional explanatory drawing which shows the state in which the resin mold membrane | film | coat was formed in the axial direction both end surface of the stator core main body in Example 1. FIG. The front view which shows the structure of the lower mold | type for forming the resin molding film in Example 2, and an upper mold | type. The side view which shows the structure of the lower mold | type for forming the resin molding film in Example 2, and an upper mold | type. Explanatory drawing which shows the state which inserts a resin molding film in the slot part of a stator core main body in Example 2. FIG. Explanatory drawing which shows the state immediately after inserting the resin molding film in the slot part of the stator core main body in Example 2. FIG. Explanatory drawing which shows the structure of the 1st resin mold lower mold | type for forming the resin mold membrane | film | coat in Example 2, and a resin mold upper mold | type. Explanatory drawing which shows the state in which the stator core main body in Example 2 is clamped between the 1st resin mold lower mold | type and the resin mold upper mold | type, and can be injection-molded. Explanatory drawing which shows the state which performed the mold opening of the 1st resin mold lower mold | type and the resin mold upper mold | type after injection molding in Example 2. FIG. Explanatory drawing which shows the structure of the 2nd resin mold lower mold | type for forming the resin mold membrane | film | coat in Example 2, and a resin mold upper mold | type. Explanatory drawing which shows the state in which the stator core main body in Example 2 is clamped between the 2nd resin mold lower mold | type and the resin mold upper mold | type, and can be injection-molded. Sectional explanatory drawing which shows the state in which formation of the insulation part in Example 2 was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator core 2 Stator core main body 20 Yoke part 22 Teeth part 25 Slot part 4 Insulation part 41 Resin molding film 411 Insertion part 412 Flange part 413 Standing part 42 Resin mold film 5, 500 Lower mold | type 51 1st recessed part 5
52 Flange outer surface forming surface 53 Standing portion outer surface forming surface 55 Length adjusting means 6, 600 Upper mold 61 First protrusion 62 Flange inner surface forming surface 63 Standing portion inner surface forming surface 7 Welding machine 81 First resin mold lower die 82 2nd resin mold lower mold 9 Resin mold upper mold 95 Cavity part

Claims (10)

A stator core body including a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion, and a slot portion formed between the teeth portions; A stator core having an insulating portion for achieving electrical insulation between a coil to be inserted and the stator core body,
The insulating portion comprises a resin molded film that covers the inner wall surface of the slot portion, and a resin mold film that covers both axial end surfaces of the stator core body,
The resin-molded film includes an insertion portion having a substantially U-shaped cross section facing the inner wall surface of the slot portion, and a flange that protrudes from the slot portion at both ends of the insertion portion so as to approach both end surfaces of the stator core body And an upright portion bent in the axial direction from the outer peripheral end of the flange portion,
The said resin mold membrane | film | coat is arrange | positioned so that the said flange part and the said standing part may be covered, The stator core characterized by the above-mentioned.   2. The stator core according to claim 1, wherein the flange portion of the resin molded film has a width dimension that is substantially half the thickness of the tooth portion.   3. The stator core according to claim 1, wherein the standing portions of the resin molded film inserted and arranged in the adjacent slot portions are joined to each other. A stator core body including a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion, and a slot portion formed between the teeth portions; A method of manufacturing a stator core having an insulating portion for achieving electrical insulation between a coil to be inserted and the stator core body,
An insertion portion formed in a substantially U-shaped cross section so as to face the inner wall surface of the slot portion, a flange portion bent outward at both ends of the insertion portion, and an axial direction from the outer peripheral end of the flange portion Prepare a resin molded film having a bent standing part,
The resin molded film is inserted into the slot portion of the stator core body, the inner wall surface of the slot portion is covered with the insertion portion, and the flange portions are opposed to both end faces of the stator core body,
A method for manufacturing a stator core, comprising: forming a resin mold film so as to cover both end surfaces of the stator core body in the axial direction and to cover the flange portion and the standing portion of the resin molded film.   5. The resin molded film according to claim 4, wherein the resin molded film is formed so as to have the insertion portion having a length corresponding to an axial dimension of the stator core body after the production of the stator core body is completed. A stator core manufacturing method. In Claim 4, the resin molded film uses the one having the insertion portion provided with a margin for absorbing the variation in the axial dimension of the stator core body,
In forming the resin mold film, a method of manufacturing a stator core, wherein the margin of the insertion portion inserted into the slot portion is offset toward one end surface of the stator core body.   The method for manufacturing a stator core according to any one of claims 4 to 6, wherein the resin molded film is inserted and arranged in the slot portion, and then the adjacent standing portions are joined to each other. Arranged in the slot portion of the stator core body including a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion, and a slot portion formed between the teeth portions. It is a resin molded film for slot part insulation provided,
An insertion portion formed in a substantially U-shaped cross section so as to face the inner wall surface of the slot portion;
Flange portions bent outward at both ends of the insertion portion;
A resin molded film for insulating a slot portion, comprising a standing portion bent in an axial direction from an outer peripheral end of the flange portion.   9. The resin molded film for insulating a slot portion according to claim 8, wherein the flange portion has a width dimension that is substantially half the thickness of the tooth portion. Arranged in the slot portion of the stator core body including a ring-shaped yoke portion, a plurality of teeth portions projecting radially inward from the yoke portion, and a slot portion formed between the teeth portions. An insertion portion configured to have a substantially U-shaped cross section so as to face the inner wall surface of the slot portion, a flange portion bent outward at both ends of the insertion portion, A method of manufacturing a resin molded film for insulating a slot portion having a standing portion bent in an axial direction from an outer peripheral end,
A groove-shaped first recess for forming the outer surface of the insertion portion, a flange outer surface forming surface extending in a direction perpendicular to the longitudinal direction of the first recess at both ends of the first recess, and the flange outer surface forming surface A lower mold having a standing portion outer surface forming surface extending from the outer peripheral end in the same direction as the longitudinal direction of the first recess;
A first protrusion provided to be inserted into the first recess, and a flange inner surface formed so as to face the flange outer surface forming surface with a predetermined clearance at both ends of the first protrusion, Using an upper mold having the upright portion outer surface forming surface and the upright portion inner surface forming surface provided so as to face each other through a predetermined clearance,
And both the said lower mold | type and the said upper mold | type are divided | segmented into two in the longitudinal direction center part, and have a length adjustment means to adjust the space | interval of both, The said length adjustment means, According to the axial length of the stator core body to which the resin molded film is to be mounted, the interval is configured to be adjustable,
The spacing is adjusted according to the axial length of the stator core body, and the material is placed between the lower mold and the upper mold in an environment where predetermined heat is applied to the material made of a substantially rectangular resin film. By sandwiching, the insertion portion having a substantially U-shaped cross section is formed between the first recess and the first protrusion, and the flange portion is formed between the flange outer surface forming surface and the flange inner surface forming surface. And forming the upright portion between the upright portion outer surface forming surface and the upright portion inner surface forming surface. A method for producing a resin molded film for insulating a slot portion, comprising:

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