JP2006081250A - Stator core and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor core whose rigidity can be raised by improving the yield rate of a material at its manufacture thereby reducing its iron loss and increasing its output torque, and its manufacturing method. <P>SOLUTION: This stator core 1 is composed of a skeleton part 2 which is made with its band-shaped electromagnetic steel plate 20 or the like being stacked by spirally winding the band-shaped electromagnetic steel plate 20 or the like composed of a band-shaped yoke part 21 and a plurality of teeth parts 22, 22,... projecting at right angles with the axis of the yoke 21, and a resin film 3 which contains metallic powder 4 for covering the entire surface of the skeleton part 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a stator core constituting a motor and a method for manufacturing the same, and in particular, the rigidity of a stator core formed by laminating electromagnetic materials (electromagnetic steel plates and electromagnetic soft iron plates) in a spiral winding can be increased, and iron loss can be reduced. The present invention relates to a stator core capable of increasing output torque and a method for manufacturing the same.

  Conventionally, a stator core that constitutes a motor has a central circular portion (circular portion constituted by end portions of a plurality of teeth portions) and a slot portion of an electromagnetic material such as a circular electromagnetic steel plate and an electromagnetic soft iron plate, for example. It was manufactured by stamping and molding with a metal mold having high dimensional accuracy, and laminating while stamping the yoke part of the electromagnetic steel sheet or electromagnetic soft iron sheet after punching. An outline of such a manufacturing method is shown in FIG. 5, and the stator core d is manufactured by sequentially laminating the above-described magnetic steel plates c from which the central circular portion a and the slot portion b are punched (in the direction of the arrow X). Has been. This manufacturing method has a problem that the material yield is 50% or less, and a majority of the material becomes waste.

  In recent years, the stator core manufacturing method has been changing in the midst of the progress of stator core manufacturing technology and the increasing trend of reducing emissions in consideration of environmental impact. That is, only the slot portion is punched from a strip-shaped electromagnetic steel plate or electromagnetic soft iron plate, and the stator core is manufactured by spirally laminating the punched electromagnetic steel plate or electromagnetic soft iron plate with a required curvature in the plane. Is. According to this manufacturing method, the material yield can be improved to about 70%, and the material that becomes the waste material can be remarkably reduced.

  By the way, although the waste material at the time of stator core manufacture can be reduced significantly by the said manufacturing method, the following problems have arisen. That is, (1) When the strip-shaped electromagnetic steel plate or electromagnetic soft iron plate after punching the slot portion is spirally laminated while being plane bent, the in-plane on the outer peripheral side and inner peripheral side of the yoke portion Since the extension amounts are different, the yoke thickness at the outer peripheral end of the yoke portion is inevitably thinner than that at the inner peripheral end. Therefore, when the layers are spirally laminated, the surface in contact with the layers is only the teeth portion with the smallest in-plane elongation, and the caulking process at the yoke portion becomes extremely difficult. It is difficult to ensure rigidity. (2) By bending the yoke portion, each angle of the teeth portion protruding inward in the radial direction of the ring-shaped yoke portion with the yoke portion as a base point is not necessarily formed so as to be directed toward the center of the ring. Therefore, it depends on the local layer thickness, material composition, processing accuracy, etc. Therefore, when the layers are spirally laminated, the protrusion angle of the tooth portion for each layer tends to vary. Furthermore, since the corners of the laminated tooth portions are right-angled edges, the teeth portions (insulating paper) are used to prevent the winding from being cut at the corners when the winding is wound. In particular, corners) need to be coated.

Patent Document 1 discloses an invention relating to a stator of a motor in which windings wound around a stator core and a stator iron core are integrally formed of synthetic resin for the purpose of reducing noise and vibration of the motor. In such an invention, a hole having a larger surface area is further provided in the synthetic resin portion in order to prevent a decrease in heat dissipation caused by molding the entire stator with synthetic resin.
JP-A-10-271720

  According to the motor stator of Patent Document 1, the entire stator core and windings are molded with synthetic resin, and the holes for preventing heat radiation deterioration are provided in the synthetic resin portion, thereby reducing noise and vibration. Thus, a motor stator having relatively good heat dissipation can be obtained. However, it is considered that the stator core of the present invention is not intended for a stator core formed by laminating electromagnetic steel sheets or the like in a spiral shape, and may occur when the stator core is formed by laminating electromagnetic steel sheets or the like in a spiral shape. There is no disclosure of solutions for each problem.

  The present invention has been made in view of the above problems, and in a stator core formed by laminating a strip-shaped electromagnetic material in a spiral shape, its rigidity can be improved and iron loss can be reduced. Further, it is an object of the present invention to provide a stator core capable of increasing output torque and a method for manufacturing the same. In addition, the quality of the stator core can be ensured even when the band-shaped electromagnetic material is spirally laminated and the protrusion angle of the tooth portion varies from layer to layer. It is an object of the present invention to provide a stator core that does not require the tooth portion to be covered with insulating paper when winding a wire, and a method for manufacturing the stator core.

  In order to achieve the above object, a stator core according to the present invention is a stator core that constitutes a motor, and is composed of a belt-shaped yoke portion and a plurality of tooth portions protruding in a direction perpendicular to the axis of the yoke portion. It is characterized by comprising a skeleton part formed by laminating the band-like electromagnetic material by winding the material in a spiral shape and a resin film covering the entire surface of the skeleton part.

  The stator core of the present invention can be used for various motors including DC motors such as brushed motors and brushless motors. Here, the electromagnetic material means an electromagnetic steel plate or an electromagnetic soft iron plate.

  The stator core of the present invention is formed by punching and forming only a slot portion from a strip-shaped electromagnetic steel plate or electromagnetic soft iron plate and spirally laminating the electromagnetic steel plate or the like after punching the slot portion while performing plane bending with a required curvature. Here, the stator core at the stage where the required axial length (stacked length) is reached is used as the skeleton portion. As described above, the skeleton portion has variations in the protrusion angle of the tooth portion for each layer. Therefore, in the present invention, a resin film is formed by molding the entire surface of the skeleton part with resin. Examples of the resin that covers the entire surface of the skeleton portion of the tooth portion include thermosetting resins such as thermosetting acrylic resins, polyurethane resins, phenol resins, polyester resins, and epoxy resins.

  Here, the entire surface of the skeleton portion of the teeth portion refers to the yoke portion constituting the stator core, the outer peripheral surface, the inner peripheral surface, and the end surface of the stator core along each shape of the tooth portion, as well as between the yoke portions of the stacked layers. It also means a gap. As described above, when magnetic steel sheets and the like are laminated in a spiral shape, the yoke thickness of the outer peripheral portion inevitably increases because the amount of elongation in the surface on the outer peripheral side and the inner peripheral side of the yoke portion differs. Accordingly, the yoke portion becomes thinner, and therefore, a gap is generated between the respective layers in the yoke portion. The generation of such a gap makes it difficult to perform caulking at the yoke portion, and also reduces the overall rigidity of the stator core. By forming a resin film on the entire surface of the skeleton part as in the present invention, the resin film penetrates into the gaps formed between the layers and hardens, and the yoke parts to be laminated are joined via the resin. Thus, the rigidity of the entire stator core can be increased.

  In addition, by covering the entire tooth portion having a different protrusion angle for each of the stacked layers with the resin coating, it is possible to manufacture a high-quality stator core from which variations in the tooth portion are removed. In addition, a chamfered portion is provided on the resin coating around the corner portion of the tooth portion, or a smooth curved shape is obtained, so that a winding is wound around the tooth portion without covering the tooth portion with insulating paper. The problem that the winding is cut when turning can be solved.

  Therefore, according to the stator core of the present invention, it is possible to improve the material yield at the time of manufacture of the stator core, it is possible to sufficiently ensure the rigidity and quality of the stator core, and further, the insulating paper that has been used conventionally can be used. It becomes possible to make it unnecessary.

  In another embodiment of the stator core according to the present invention, a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions projecting in the direction perpendicular to the axis of the yoke portion is spirally wound. The skeleton portion is formed by laminating the band-shaped electromagnetic material, and a metal powder layer covering the entire surface of the skeleton portion.

  The present invention relates to a stator core coated with a metal powder layer instead of resin. In forming the metal powder layer, for example, pure iron, iron close to it, aluminum or the like can be used, and it is more preferable if the metal powder is a magnetic powder. When using metal powder that is not magnetic powder, the rigidity of the stator core can be increased by the metal powder entering the gaps between the yoke portions described above. On the other hand, in the case of metal powder that is magnetic powder, in addition to increasing the rigidity of the stator core, the amount of magnetic flux can be increased at the same voltage, and the output torque can be increased. When the magnetic powder covers around the shape of the stator core, the area of the magnetic powder is added to the winding area wound around the stator core, and the increase of the magnetic flux area leads to an increase in output torque. Is. On the other hand, with the same torque, the magnetic flux density per unit cross-sectional area decreases as the magnetic flux area increases, and the iron loss is reduced as the magnetic flux density decreases.

  By covering the entire surface of the skeleton part with a metal powder layer as in the present invention, it becomes possible to improve the material yield at the time of manufacturing the stator core, and to sufficiently ensure the rigidity and quality of the stator core. It becomes. When the metal powder is a magnetic powder, it is possible to further reduce the iron loss and increase the output torque.

  Further, a preferred embodiment of the stator core according to the present invention is formed by spirally winding a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. And a skeleton formed by laminating the band-shaped electromagnetic material, and a resin film containing metal powder covering the entire surface of the skeleton.

  By coating the entire surface of the skeleton part with a resin coating containing metal powder, both the effect of coating only with the resin coating and the effect of coating only with the metal powder layer are obtained. Can do. In the case of using a resin as compared with the metal powder, since the resin can enter the gap between the yoke portions of each layer more densely, the rigidity of the stator core can be reliably increased. On the other hand, when metal powder, especially magnetic powder, is used, it is possible to reduce iron loss and increase output torque as described above. Therefore, it is possible to obtain all of the above effects by coating the skeleton with a resin coating containing metal powder.

  A stator core manufacturing method according to the present invention is a method for manufacturing a stator core that constitutes a motor. The stator core manufacturing method includes a belt-shaped yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. By winding the electromagnetic material spirally, the first step of laminating the band-shaped electromagnetic material to form a skeleton, and the second step of forming a resin film on the entire surface of the skeleton It is characterized by becoming.

  After the skeleton part is manufactured by the first step, the skeleton part is placed in a mold having a desired inner cavity shape, and a molten resin (for example, a thermosetting resin) is placed between the mold and the skeleton part. The stator core of the present invention is manufactured by pouring and heating the inside of the mold to cure the resin (second step). Since the melted resin surely enters the gaps between the yoke portions of each layer in the entire surface of the skeleton portion, the resin after thermosetting firmly bonds the yoke portions together.

  In another embodiment of the stator core manufacturing method according to the present invention, a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion is spirally formed. It comprises a first step in which the band-shaped electromagnetic material is laminated to form a skeleton by winding, and a second step in which a metal powder layer is formed on the entire surface of the skeleton. .

  The second step of forming the metal powder layer on the entire surface of the skeleton part is performed by a method of pressing the metal powder into the skeleton part. As the press working method, for example, there are the following three methods.

  As a first method, first, a mold including a cylindrical outer mold and a lower mold that closes the lower end of the outer mold is prepared. An opening having the same shape as the circular portion at the center of the stator core is formed in the center of the lower mold. A middle mold having the same shape as the central circular portion and having a length from the upper end to the lower end of the outer mold is fitted into the opening of the lower mold so that the outer mold, the lower mold, and the middle mold are integrated. Here, the dimension of the space surrounded by the upper surface of the lower mold, the outer peripheral surface of the middle mold, and the inner peripheral surface of the outer mold (hereinafter referred to as a skeleton part arrangement space) is larger than the dimension of the longitudinal section of the skeleton part. It is configured. A metal powder is put into the skeleton part arrangement space and pressed at a constant pressure (for example, P1) to produce a primary press body. Next, the skeleton part formed in the first step is arranged in the skeleton part arrangement space (at this time, the primary press body is in close contact with the lower end of the skeleton part). When arranging the skeleton part, the skeleton part is arranged so that a predetermined gap is formed between the skeleton part and the inner peripheral surface of the outer mold, and between the skeleton part and the outer peripheral surface of the middle mold. A metal powder is introduced into the gap, and a metal powder having a predetermined thickness is also introduced into the upper end surface of the skeleton. After the metal powder is charged, the upper die, which is substantially the same shape as the lower die, is lowered while penetrating the middle die through the opening at the center, and the metal powder stacked on the upper end surface of the skeleton portion at the lower end surface of the upper die Press at a constant pressure (for example, P2). By such pressing, a secondary press body made of metal powder is formed on the side surface and the upper end surface of the skeleton. The entire surface of the skeleton is covered with the metal powder by the primary press body and the secondary press body described above. In addition, P2 needs to be a pressure larger than P1.

  As a second method, the above-described primary press body is manufactured in advance, and the primary press body is placed in the same skeleton part placement space as that described above. The skeletal part is disposed on the primary press body, and the metal powder can be pressed on the entire surface of the skeletal part by charging the metal powder and pressing the upper die as in the first method. The third method is a method that eliminates the manufacturing process of the primary press body described above. For example, a predetermined amount of metal powder is first put into the above-described skeleton arrangement space, and the skeleton is placed thereon. The metal powder is further introduced into the skeleton part arrangement space, and the metal powder having a predetermined thickness is also introduced into the upper end surface of the skeleton part. Finally, by pressing the upper mold and the lower mold at the same pressure, the metal powder can be pressed all at once on the entire surface of the skeleton.

  Furthermore, in another embodiment of the stator core manufacturing method according to the present invention, a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions protruding in the direction perpendicular to the axis of the yoke portion is spirally formed. It comprises a first step in which the belt-like electromagnetic material is laminated to form a skeleton by winding, and a second step in which a resin film containing a metal powder is formed on the entire surface of the skeleton. It is characterized by.

  In the second step of the present invention, a molten resin containing a metal powder such as iron powder or aluminum powder is poured around the skeleton placed in the mold, and the resin is cured by heating the mold. It is. According to the method for manufacturing a stator core of the present invention, the resin containing the metal powder can surely enter the gap between the yoke portions of each layer, and the rigidity of the stator core can be increased by hardening the resin. Furthermore, when the metal powder is a magnetic powder, the magnetic flux area can be increased by the coating of the magnetic powder formed on the inner and outer peripheral surfaces of the skeleton.

  As can be understood from the above description, according to the stator core and the manufacturing method thereof of the present invention, the material yield at the time of manufacturing the stator core can be improved, and a stator core having sufficient rigidity can be obtained. Moreover, according to the stator core and the manufacturing method thereof of the present invention, it is possible to obtain a stator core that can reduce iron loss and increase output torque.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state in which magnetic steel sheets are spirally laminated, and FIG. 2 shows an embodiment of a stator core of the present invention covered with a resin film containing metal powder. It is a perspective view. 3 shows a sectional view taken along line III-III in FIG. 2, and FIG. 4 shows a sectional view taken along line IV-IV in FIG. The embodiment described with reference to the drawings relates to a stator core coated with a resin film containing a metal powder, but it goes without saying that the stator core of the present invention is not limited to such an embodiment. Moreover, although an electromagnetic steel plate is taken up and demonstrated as an electromagnetic material, it cannot be overemphasized that an electromagnetic soft iron plate may be sufficient.

  FIG. 1 shows a situation in which the skeleton part 2 is manufactured while spirally winding a strip-shaped electromagnetic steel sheet 20 which is the first step of the method for manufacturing a stator core of the present invention. A band-shaped electromagnetic steel sheet 20 including a band-shaped yoke portion 21 and teeth portions 22, 22,... Projecting in a direction perpendicular to the axis of the band-shaped yoke portion 21 is manufactured by punching, for example, a slot portion from a band-shaped workpiece in advance. . The skeleton 2 is manufactured by laminating the strip-shaped electrical steel sheet 20 in a spiral manner until it reaches a required height.

  As shown in FIG. 1, in the manufacturing process in which the strip-shaped electromagnetic steel sheet 20 is spirally wound, there is a very high possibility that the protrusion angles of the stacked teeth portions 22, 22,.

  FIG. 2 shows a stator core 1 in which the skeleton 2 is covered with a resin coating 3 containing a metal powder 4. The stator core 1 is formed by placing the skeleton part 2 manufactured in the first step in a mold (not shown), pouring a molten resin film 3 containing the metal powder 4 into the mold and heating the mold. The entire surface of the skeleton 2 is coated with the resin coating 3 (second step). Since the stator core 1 of the present invention covers the surfaces of the teeth portions 22, 22,... Having variations in the projection angle for each layer with the resin coating 3 (the resin coating 3 containing the metal powder 4), FIG. As shown in FIG. 3, the stator core 1 from which the variation of the teeth portions 22, 22,.

  FIG. 3 shows a cross-sectional view taken along the line III-III in FIG. In this invention, the frame | skeleton part 2 is manufactured by laminating | stacking in a 1st process, winding the strip | belt-shaped electromagnetic steel plate 20 spirally so that the teeth part 22 may be set to the inner side of a ring. For this reason, the yoke portion 21 that becomes the outer side of the ring when being wound is stretched more in the plane than the tooth portion 22, so that the thickness of the tooth portion 22 is thinner than the thickness of the yoke portion 21. . Further, the thickness of the yoke portion 21 is different between the outer peripheral side and the inner peripheral side of the yoke portion 21. As a result, as shown in FIG. 3, a gap is generated between the stacked yoke portions 21 and 21. In the present invention, since the resin film 3 containing the metal powder 4 is surely inserted into the gap, the upper and lower yoke portions 21 and 21 can be connected via the resin film 3 and the resin film Since the skeleton part 2 is surrounded by 3, the stator core 1 having sufficient rigidity as a whole is molded.

  FIG. 4 shows a cross-sectional view taken along the line IV-IV in FIG. A winding (coil) is wound around the tooth portion 22 to complete the stator of the motor. As shown in FIG. 4, in the resin film containing the metal powder 4 that covers the outer periphery of the tooth portion 22, it is preferable to provide a chamfered portion 31 in which the corner portion of the tooth portion 22 is formed into a smooth curved shape. . This is because, when winding the winding, the winding is not damaged even if the corner portion is not covered with insulating paper as in the prior art.

  The inventors have a conventional stator core as shown in FIG. 5 (hereinafter referred to as a conventional stator core), a stator core (hereinafter referred to as a skeleton portion) that is simply wound in a spiral shape, and a skeleton portion formed of a resin film. A coated stator core (hereinafter referred to as stator core A), a stator core (hereinafter referred to as stator core B) whose skeleton is coated with a magnetic metal powder layer, and a resin film containing the skeleton as magnetic metal powder. Each of the coated stator cores (hereinafter referred to as “stator core C”) was used to make a prototype of the same shape, and the rigidity of each stator core was compared and the magnetic characteristics were compared. Here, the rigidity of the stator core refers to the interlayer adhesive strength between the laminated layers, and the magnetic characteristics relate to iron loss and output torque. The resin used in this experiment is BMC (bulk mold compound) resin. The BMC resin is a molding resin obtained by kneading glass fiber or the like with an unsaturated polyester resin as a main component. Table 1 shows the experimental results.

  Table 1 shows a result of comparison based on the rigidity and each magnetic characteristic value of the conventional stator core.

  First, as for the rigidity ratio, the result is that the rigidity of a skeleton portion formed by spirally winding a belt-shaped electromagnetic steel sheet is significantly lower than that of a conventional stator core. As described above, this is because a gap is generated between the yoke portions of each layer.

  Stator core A in which the entire surface of the skeleton part is coated with a resin film results in a dramatic improvement in rigidity compared to the skeleton part. This is considered to be caused by the result of the resin entering the gap generated between the yoke portions of each layer and curing. In the stator core B in which the entire surface of the skeleton part is covered with the metal powder layer, the metal powder cannot sufficiently enter the gap between the yoke parts as compared with the resin, and as a result, the rigidity is lowered as compared with the stator core A. Yes. On the other hand, in the stator core C, the metal powder contained in the resin inhibits the resin from sufficiently entering the gap between the yoke portions, so that it is considered that the rigidity is lower than that of the stator core A. Therefore, by using the conventional stator core as the skeleton part and the stator cores A to C, the material yield at the time of manufacturing the stator core can be improved. However, from the viewpoint of rigidity, the stator core A having the same degree of rigidity as the conventional stator core is preferable. Conceivable.

  Next, when comparing the experimental results regarding the magnetic characteristics, the stator core A is slightly increased in comparison with the conventional stator core and the skeleton part with respect to the iron loss, while the stator cores B and C having magnetic metal powder components are obtained. Then, the iron loss decreased. Since the amount of magnetic metal powder added to the stator core B is larger than that of the stator core C, the magnetic flux area of the stator core increases in proportion to the added amount, and therefore the magnetic flux density per unit area decreases, resulting in less iron loss. This is considered to be the result.

  Since the value of the output torque increases as the magnetic flux area increases, the stator core B with a large amount of magnetic metal powder added results in the largest output torque value.

  From the above experimental results, when considering the stator core (frame part) formed by winding and laminating belt-shaped magnetic steel sheets in a spiral, the metal having magnetism is considered by comprehensively considering both the rigidity and magnetic properties of the stator core. A stator core (stator core C) formed by coating a skeleton with a resin film containing powder is considered to be the most preferable stator core. In addition, when importance is attached to the rigidity of the stator core, that is, the durability of the stator core, it is preferable to select a stator core (stator core A) that is covered only with a resin film. It is considered preferable to select a stator core (stator core B) formed by coating with a metal powder layer.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

The perspective view which showed the condition which has laminated | stacked the electromagnetic steel plate helically. The perspective view which showed one Embodiment of the stator core of this invention coat | covered with the resin mold containing a metal powder. III-III sectional drawing of FIG. IV-IV sectional drawing of FIG. The perspective view which showed the outline | summary of the manufacturing method of the conventional stator core.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Stator core, 2 ... Frame | skeleton part, 3 ... Resin film, 4 ... Metal powder, 20 ... Strip | belt-shaped electromagnetic steel plate (electromagnetic material), 21 ... Yoke part, 22 ... Teeth part

Claims (6)

A stator core constituting a motor,
Formed by laminating the strip-shaped electromagnetic material by spirally winding a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. A stator core comprising: a skeleton portion and a resin film covering the entire surface of the skeleton portion. A stator core constituting a motor,
Formed by laminating the strip-shaped electromagnetic material by spirally winding a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. And a metal powder layer that covers the entire surface of the skeleton portion. A stator core constituting a motor,
Formed by laminating the strip-shaped electromagnetic material by spirally winding a strip-shaped electromagnetic material composed of a strip-shaped yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. And a resin film containing a metal powder covering the entire surface of the skeleton. A method of manufacturing a stator core constituting a motor,
The belt-like electromagnetic material is laminated in a spiral manner by winding a belt-like electromagnetic material composed of a belt-like yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. A stator core manufacturing method comprising: a first step of forming a portion; and a second step of forming a resin film on the entire surface of the skeleton portion. A method of manufacturing a stator core constituting a motor,
The belt-like electromagnetic material is laminated in a spiral manner by winding a belt-like electromagnetic material composed of a belt-like yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. A stator core manufacturing method comprising: a first step of forming a portion; and a second step of forming a metal powder layer on the entire surface of the skeleton portion. A method of manufacturing a stator core constituting a motor,
The belt-like electromagnetic material is laminated in a spiral manner by winding a belt-like electromagnetic material composed of a belt-like yoke portion and a plurality of teeth portions protruding in a direction perpendicular to the axis of the yoke portion. A stator core manufacturing method comprising: a first step of forming a portion; and a second step of forming a resin film containing a metal powder on the entire surface of the skeleton portion.

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