JP2004187478A - Process for producing core and core sheet, and process for manufacturing stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core capable of suppressing cogging torque. <P>SOLUTION: Tees 13 are extending radially, at a constant angular interval, from the center of a core sheet 11. A bending piece 14 (a long bending piece 14a and a short bending piece 14b) is formed at the forward end (outer diameter side) of each tees 13. Surface and rear surface of the core sheet 11 are laminated alternately sheet by sheet thus forming a core 21. Even if the bending piece 14 (a long bending piece 14a and a short bending piece 14b) is bent at a cut part 15, gaps are not formed continuously in the laminating direction of the core sheet 11. Consequently, a suitable magnetic circuit is formed in the core 21 and increase of reluctance can be suppressed. Since the base ends of respective tees 13 are coupled at a coupling part 16, increase of reluctance can be suppressed and thereby cogging torque does not increase. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a core and a core sheet and a method for manufacturing a stator in a rotating magnetic field type electric motor.
[0002]
[Prior art]
2. Description of the Related Art As a core of a stator used in an add-on rotor type brushless motor, there is a core configured of two parts, an inner core and an outer core (see Patent Document 1). On the other hand, there is also one in which one tooth and an outer core are connected to each other at a part of the outer core and are punched out linearly to form an annular shape (see Patent Document 2).
[0003]
[Patent Document 1]
JP-A-11-46462 (FIG. 1 etc.)
[Patent Document 2]
JP-A-2002-142417 (FIG. 1 and the like)
[0004]
[Problems to be solved by the invention]
However, in Patent Literature 1, the inner core material is wasted, resulting in an increase in the cost of the motor. In addition, there is a disadvantage that it is difficult to wind the winding due to the existence of adjacent teeth. Furthermore, since it is composed of two parts, the inner core and the outer core, it is necessary to fix the outer core and the inner core. In addition, at the time of fixing the outer core and the inner core, there is a possibility that "burrs" may be generated, and an inner diameter of the inner core may be deformed, thereby affecting the rotation of the rotor.
[0005]
On the other hand, in Patent Document 2, since the inner teeth after completion are not connected, a suitable magnetic circuit is not formed, and there is a performance defect that the cogging torque of the rotor increases.
[0006]
The present invention has been made in view of such a problem, and has the following objects [1] and [2].
[1] An object of the present invention is to provide a core capable of suppressing cogging torque and a method for manufacturing a core sheet used for the core.
[0007]
[2] An object of the present invention is to provide a stator manufacturing method capable of simplifying a winding step of winding a winding and an assembling step of a core.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, teeth extending radially, a connecting portion connecting the teeth on the inner diameter side, and extending further from the outer diameter side of the teeth to the outer diameter side At the same time, a core sheet provided with a bent piece that is bent in the circumferential direction so as to face a bent piece of another tooth to form an outer annular portion was laminated.
[0009]
According to the second aspect of the present invention, in the core according to the first aspect, a gap is formed in a circumferential direction between the bent pieces so that the gap is not continuous in a stacking direction of the core sheets. Or the gap is positioned at the center of the teeth in the width direction.
[0010]
In the invention according to claim 3, in the core according to claim 1 or 2, the core sheet includes the bent piece including two long and short pieces that are bent in opposite directions to one tooth, After being formed into an annular shape or being formed into a linear shape according to the number of teeth for one sheet, it was formed into an annular shape, and the front and back surfaces of the core sheet were alternately laminated one by one.
[0011]
In the invention described in claim 4, in the core described in claim 1 or 2, the bent pieces are formed on every other tooth.
According to a fifth aspect of the present invention, in the core according to the fourth aspect, the core sheet includes two bent pieces having the same length in one tooth, and the core sheet is rotated by one tooth to be laminated. did.
[0012]
According to a sixth aspect of the present invention, in the core according to any one of the first, second, fourth, and fifth aspects, the core sheet is formed by punching straight. The core sheets were spirally laminated.
[0013]
In the invention according to claim 7, in the core according to claim 1 or 2, the core sheet includes the bent pieces including two long and short pieces bent in opposite directions to one tooth. The two long and short bent pieces have the same shape according to the number of teeth for one core sheet, and the two long and short bent pieces are subsequently inverted according to the number of the teeth, and these are alternately continuous. The core sheet was formed by punching straight out the core sheet, and this core sheet was laminated in a spiral shape.
[0014]
In the invention according to claim 8, in the core according to any one of claims 1 to 7, the core sheet includes two bent pieces bent in opposite directions to one tooth. The opposing surfaces of the opposing bent pieces at the time of bending are configured to be substantially parallel to each other and inclined with respect to the radial direction of the core sheet.
[0015]
According to the ninth aspect of the present invention, in the core according to the ninth aspect, each of the bending pieces has a facing surface facing the outside of the core sheet when bending, and the other facing surface faces the core sheet when bending. It is configured to face inside.
[0016]
According to a tenth aspect of the present invention, in the core according to the eighth or ninth aspect, the opposing surface of each of the bent pieces is constituted by one plane.
According to an eleventh aspect of the present invention, in the method for manufacturing a core sheet used for the core according to the third aspect, the sixth aspect, or the seventh aspect, the core sheet is configured such that the teeth are formed of the other core sheet. It enters between the teeth and is punched and formed linearly.
[0017]
According to a twelfth aspect of the present invention, before bending the bent piece in the core according to any one of the first to eleventh aspects, the bobbin for ensuring insulation between the core and the winding is provided. This is a method for manufacturing a stator in which a winding is wound around a bobbin, a bobbin is wound around the bobbin, the bobbin is mounted on the teeth, and the bent piece is bent.
[0018]
(Action)
According to the first aspect of the invention, the cogging torque is suppressed by the presence of the connecting portion that connects the teeth on the inner diameter side. In addition, the teeth and the connecting portion corresponding to the inner core and the bent piece corresponding to the outer core are formed integrally. Therefore, it is not necessary to fit the inner core and the outer core as compared with the case where the inner core and the outer core are separate bodies. Therefore, the assembling step becomes unnecessary, and "burrs" due to assembling do not occur.
[0019]
According to the second aspect of the present invention, a gap is formed in the circumferential direction between the bent pieces, and the gap is not continuous in the laminating direction of the core sheet. Be suppressed. In addition, since the center of the teeth in the width direction where the gap between the bent pieces is located is a portion where the magnetic flux density becomes low, even if the gap is continuous in the stacking direction, an increase in the magnetic resistance is suppressed. Therefore, an increase in magnetic resistance can be suppressed.
[0020]
According to the invention described in claim 3, since the core is formed by alternately laminating the front and back surfaces of the core sheet one by one, when the two long and short bent pieces are bent, the two long and short bent pieces are bent. Is not continuous in the laminating direction of the core sheet. Therefore, an increase in magnetic resistance is suppressed. As a result, a suitable magnetic circuit is formed in the core. Therefore, an increase in magnetic resistance can be suppressed.
[0021]
According to the fourth aspect of the present invention, the number of bending pieces is reduced, so that the core can be easily manufactured. Also, the number of gaps formed between the bending pieces is reduced, so that the magnetic resistance is also reduced. Therefore, an increase in magnetic resistance can be suppressed.
[0022]
According to the invention described in claim 5, the core sheet includes two bent pieces having the same length in one tooth. For this reason, the gap formed between the bent pieces is located at the center in the width direction of the tooth, but the center in the width direction of the tooth where the gap between the bent pieces is located is a portion where the magnetic flux density is sparse. Even if the gap is continuous in the stacking direction, an increase in magnetic resistance is suppressed. Further, the core sheet is laminated by being rotated by one tooth. For this reason, the gap formed between the bent pieces is not continuous in the laminating direction of the core sheet, which also suppresses an increase in magnetoresistance.
[0023]
According to the invention as set forth in claim 6, the core sheet is formed by punching out a straight line and then laminated in a spiral shape. Therefore, the core can be easily formed.
[0024]
According to the invention as set forth in claim 7, the core sheet has two long and short bent pieces having the same shape according to the number of teeth for one core sheet, and then has two long and short pieces according to the number of teeth. As the bent piece is inverted, a continuous piece of the bent piece is punched out in a straight line. The core sheets are spirally laminated. For this reason, when the two long and short bent pieces are bent after being laminated in a spiral shape, the gap formed between the two long and short bent pieces does not continue in the stacking direction. Therefore, an increase in magnetic resistance is suppressed. As a result, a suitable magnetic circuit is formed in the core. Therefore, an increase in magnetic resistance can be suppressed.
[0025]
According to the invention described in claim 8, the core sheet includes two bent pieces bent in the opposite direction to one tooth, and the opposing surfaces of the bent pieces facing each other at the time of bending are substantially parallel to each other, The core sheet is configured to be inclined with respect to the radial direction. For this reason, it is possible to prevent the distal end portion of each bent piece from interfering with the bending while bending the gap between the bent pieces sufficiently. As a result, the magnetic resistance can be further reduced.
[0026]
According to the ninth aspect of the present invention, each of the bending pieces is configured such that one of the opposing surfaces faces the outside of the core sheet and the other opposing surface faces the inside of the core sheet at the time of bending. For this reason, at the time of bending, if one bent piece whose opposing surface faces the outside of the core sheet is bent first, and the other bent piece whose opposing surface faces the inside of the core sheet is bent later, the gap between each bent piece is obtained. Is smaller, it is possible to prevent the tip portions of the bent pieces from interfering with each other at the time of bending. As a result, the magnetic resistance can be further reduced.
[0027]
According to the tenth aspect, the opposing surface of each bent piece is formed by one plane. For this reason, the shape of the opposing surface of each bent piece becomes simple, so that the opposing surface can be easily formed.
[0028]
According to the eleventh aspect of the present invention, the core sheet is formed by punching out the teeth between the teeth of the other core sheet. Therefore, the core material can be used effectively without waste. Therefore, the yield of the core material can be improved. Therefore, a low-cost motor can be provided.
[0029]
According to the twelfth aspect of the invention, the bobbin is fixed to the bent piece, and after winding the bobbin with the winding, the bobbin is mounted on the teeth. For this reason, when winding the winding, adjacent bent pieces do not interfere.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[0031]
As shown in FIG. 1, a rotor having a plurality of magnets (not shown) on a peripheral surface of which a plurality of magnets are alternately arranged in a circumferential direction is provided at the center of a core sheet 11 formed by punching out an annular shape from a core material. A through hole 12 for disposing is provided. Teeth 13 extending radially and at equal angular intervals from the center of the through hole 12 are provided. A bent piece 14 extends from the tip (outer diameter side) of each tooth 13. Specifically, a long bending piece 14a and a short bending piece 14b are formed. The bent piece 14 is formed to have the same width as each tooth 13. A cutout 15 is formed at the base end of the bent piece 14. On the other hand, a connecting portion 16 for connecting each tooth 13 is formed at a base end (inner diameter side) of each tooth 13. Slots 17 are formed between the teeth 13.
[0032]
As shown in FIG. 2, the core 21 is completed by alternately laminating the front and back of the core sheet 11 one by one. In this state, after the bobbin 30 for securing insulation between the core 21 and the winding 22 is locked to the bent piece 14, the winding 22 is wound around the bobbin 30. Thereafter, the bobbin 30 is mounted on each tooth 13. When the bent piece 14 (the long bent piece 14a and the short bent piece 14b) is bent at the notch 15, the outer annular portion is formed by the bent piece 14, and the stator 40 is completed.
[0033]
In this state, as shown in FIG. 3, a gap 18 is formed between the long bending piece 14a and the short bending piece 14b. However, since the front and back of the core sheet 11 are alternately stacked one by one, the gap 18 does not continue in the stacking direction of the core sheet 11.
[0034]
As described above, according to the first embodiment, the following operations and effects can be obtained.
(1) The teeth 13 extending radially and at equal angular intervals from the center of the core sheet 11 are provided. A bent piece 14 (a long bent piece 14a and a short bent piece 14b) is formed at the tip (outer diameter side) of each tooth 13. The core 21 is formed by alternately stacking the front and back of the core sheet 11 one by one. For this reason, even if the bent pieces 14 (the long bent pieces 14 a and the short bent pieces 14 b) are bent at the notch portions 15, the gaps 18 do not continue in the stacking direction of the core sheet 11. As a result, a suitable magnetic circuit is formed in the core 21. Therefore, an increase in magnetic resistance can be suppressed.
[0035]
(2) Moreover, since the base ends of the teeth 13 are connected to each other by the connecting portion 16, an increase in magnetic resistance is suppressed. As a result, the cogging torque does not increase.
[0036]
(3) In addition, the bent piece 14 and the connecting portion 16 corresponding to the inner core and the connecting portion 16 corresponding to the outer core are connected via the teeth 13. Therefore, it is not necessary to attach the bent piece 14 corresponding to the inner core and the connecting portion 16 corresponding to the outer core. Therefore, the assembling step becomes unnecessary. Therefore, "burrs" due to the assembly do not occur.
[0037]
(4) Further, in the winding step of winding the winding 22 around the bobbin 30, the bobbin 30 for securing insulation between the core 21 and the winding 22 is attached to the bent piece 14 before bending the bent piece 14. After locking, the winding 22 is wound around the bobbin 30. As a result, the adjacent bent pieces 14 do not interfere with the winding process. Therefore, the winding step can be easily performed.
[0038]
[Second embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 4, two core sheets 11 are punched out of a rectangular core material 10 at the same time. That is, each tooth 13 is punched and formed in a state where it enters between the teeth 13 of the other core sheet 11. Here, a hatched portion between the bent piece 14 and the connecting portion 16 shown in FIG. 4 indicates a surplus portion when two core sheets 11 are punched and formed from the core material 10 at the same time. Note that the cutout portion 15 is a surplus portion, though slightly.
[0039]
Specifically, as shown in FIG. 5, when the number of the teeth 13 is “12”, the positional relationship between the long bent piece 14a and the short bent piece 14b is switched every time the number of the teeth 13 is “12”. Punching. More specifically, in the case where the long bent piece 14a of the first tooth 13 is punched out so as to appear on the left side, the punching is performed such that the long bent piece 14a of the thirteenth tooth 13 appears on the right side. Form.
[0040]
Then, the core sheet 11 punched and formed in this manner is spirally laminated to form the core 21 as shown in FIG. At this time, the core sheets 11 are laminated in a spiral shape so that the number of the teeth 13 becomes “12”. In this way, the long bent piece 14a of the first tooth 13 appears on the left side, and the long bent piece 14a of the thirteenth tooth 13 stacked on the first tooth 13 appears on the right side. Will do. That is, when laminated in a spiral shape, the long bent pieces 14a of the teeth 13 of the first round (first to twelfth teeth 13) appear on the left side, and the second round (13th to 24th). The long bent piece 14a of the tooth 13 of the th tooth 13) appears on the right side. That is, the long bent pieces 14a of the teeth 13 in the odd-numbered turns appear on the left side, and the long bent pieces 14a of the teeth 13 in the even-numbered turns appear on the right side. Therefore, similarly to the first embodiment, the gap 18 does not continue in the stacking direction of the core sheet 11. Therefore, an increase in magnetic resistance can be suppressed.
[0041]
Then, as shown in FIG. 7, a bobbin 30 for securing insulation between the core 21 and the winding 22 is engaged with the bent piece 14 of the core 21 laminated in a spiral shape. Is wound. Thereafter, the bobbin 30 is mounted on each tooth 13. When the bent piece 14 (the long bent piece 14a and the short bent piece 14b) is bent at the notch 15, the outer annular portion is formed by the bent piece 14, and the stator 40 is completed.
[0042]
As described above, according to the second embodiment, the following operation and effect can be obtained in addition to the first embodiment.
(1) Two core sheets 11 are punched out of a rectangular core material 10 at the same time. At this time, the portion where the core material 10 remains is a portion generated between the bent piece 14 and the connecting portion 16 and a small portion of the cutout portion 15. For this reason, the core material 10 can be used effectively without waste. Therefore, the yield of the core material 10 can be improved. Therefore, a low-cost motor can be provided.
[0043]
(2) The core sheet 11 punched out of the core material 10 is spirally laminated to form the core 21. Therefore, the core 21 can be easily formed. Therefore, the stator 40 can be easily manufactured.
[0044]
(3) In addition, when laminated in a spiral shape, the long bent pieces 14a of the teeth 13 of the odd-numbered circumference appear on the left side, and the long bent pieces 14a of the teeth 13 of the even-numbered circumference appear on the right side. The core sheet 11 is punched straight from the core material 10 in accordance with the number. That is, the shape of the bent piece 14 in the teeth 13 of the even-numbered circumference is inverted from the shape of the bent piece 14 of the teeth 13 of the odd-numbered circumference. Therefore, similarly to the first embodiment, the gap 18 does not continue in the stacking direction of the core sheet 11. Therefore, an increase in magnetic resistance can be suppressed. Therefore, cogging torque can be suppressed.
[0045]
(4) The bent piece 14 is formed so as to protrude toward the outer diameter side of the core 21. Therefore, after the bobbin 30 is locked to the bent piece 14, the winding 22 can be easily wound. That is, the adjacent bent pieces 14 do not hinder the winding of the winding 22. Therefore, the winding step can be easily performed. Therefore, the manufacture of the stator 40 can be easily performed.
[0046]
Each of the above embodiments can be embodied with the following changes.
In the core sheet 11 according to the second embodiment, first, one core sheet 11 is formed in an annular shape. When the bent piece 14 is bent, the gap 18 formed between the long bent piece 14a and the short bent piece 14b is not connected to the odd-numbered core sheet 11 so that the gap 18 is not continuous in the stacking direction. The core 21 may be formed by laminating the core sheet 11 with the eye. When one core sheet 11 is formed in an annular shape, the start end and the end of the core sheet 11 may be joined by, for example, welding.
[0047]
The core 21 may be formed while shifting the positions of the start and end of the core sheet 11 so that the positions of the start and end of the core sheet 11 do not overlap in the stacking direction.
[0048]
Further, the core sheet 11 may be formed in an annular shape by positioning the teeth 13 with the bobbin 30 without joining the start end and the end of the core sheet 11 by, for example, welding.
[0049]
After the winding 22 is wound around the bobbin 30, the bobbin 30 after winding may be attached to each of the teeth 13 of the core 21.
As shown in FIG. 8A, two core sheets 11 are simultaneously punched out of a rectangular core material 10. Specifically, two bent pieces 14 of the same length are provided only at the tip of every other tooth 13. In other words, teeth 13 having two bent pieces 14 of the same length are formed by punching every other tooth. Then, one core sheet 11 is rotated by one tooth 13 and laminated. With this configuration, as shown by the broken line in FIG. 8B, even if the bent pieces 14 of the same length are bent at the cutouts 15, they are rotated by one tooth 13 and stacked. The gaps 18 formed between the bending pieces 14 having the same length are not continuous in the stacking direction. Further, since the number of bending the bending pieces 14 is reduced, the core 21 is easily manufactured. Further, since the number of gaps 18 formed between the bending pieces 14 is reduced, the magnetic resistance is also reduced. Therefore, an increase in magnetic resistance can be suppressed.
[0050]
As shown in FIG. 9A, two core sheets 11 are punched out of a rectangular core material 10 at the same time. Specifically, only one bent piece 14 is provided at the tip of each tooth 13. With such a configuration, as shown by a broken line in FIG. 9B, when one bent piece 14 is bent at the cutout portion 15, the tip of the bent bent piece 14 and the bent piece 14 on the right side are bent. A gap 18 is formed between the base 18 and the base end. By the way, the center of the teeth 13 in the width direction where the gaps 18 between the bent pieces 14 are located is a portion where the magnetic flux density is sparse, so that even if the gaps 18 are continuous in the stacking direction, an increase in the magnetic resistance is suppressed. can do.
[0051]
-As shown in FIGS. 10A and 10B, the distal end portion of the long bent piece 14a formed at the distal end (outer diameter side) of each tooth 13 and the distal end of the adjacent tooth 13 (outer diameter side). The tip portions of the short bent pieces 14b face each other when bent. That is, opposing surfaces 14c and 14d are formed at the tip of the long bending piece 14a and the tip of the short bending piece 14b, respectively. The facing surfaces 14c and 14d are formed of one plane, are parallel to each other when bent, and are inclined with respect to the radial direction of the core sheet 11. The facing surface 14c of the long bending piece 14a is formed to be inclined radially outward from the distal end toward the base end (clockwise), so that the facing surface 14c faces the outside of the core sheet 11. . On the other hand, the opposing surface 14d of the short bending piece 14b is formed so as to be inclined radially inward from the distal end toward the proximal end (as the counterclockwise direction is approached) so that the opposing surface 14d faces the inside of the core sheet 11. ing. The long bending piece 14a and the short bending piece 14b bend the long bending piece 14a first (arrow A), and then move the short bending piece 14b so that the facing surface 14d approaches the facing surface 14c of the long bending piece 14a. Bend (arrow B).
[0052]
By doing so, it is possible to prevent the distal end portions of the long bent piece 14a and the short bent piece 14b from interfering with each other at the time of bending, while sufficiently reducing the gap 18 over the entire opposing surfaces 14c and 14d. Therefore, the magnetic resistance between the distal end portions of the long bending piece 14a and the short bending piece 14b can be further reduced. Further, in this case, the opposing surface 14c of the long bending piece 14a is formed so as to face the outside of the core sheet 11 when bending, and the opposing surface 14d of the short bending piece 14b is formed so as to face the inside of the core sheet 11; The long bending piece 14a is bent first, and then the short bending piece 14b is bent. Therefore, the gap 18 between the facing surfaces 14c and 14d can be made smaller. Further, since each of the opposing surfaces 14c and 14d is constituted by one plane, the shape of each of the opposing surfaces 14c and 14d is simple, and the opposing surfaces 14c and 14d can be easily formed.
[0053]
The facing surfaces 14c and 14d may be curvedly inclined with respect to the radial direction of the core sheet 11.
As shown in FIG. 10 (c), the opposing surface 14e of the long bent piece 14a is formed such that the radially inner portion of the opposing surface 14c faces the inside of the core sheet 11, and the substantially central portion in the radial direction is formed. The short bent piece 14b has a shape protruding toward the facing surface 14f. On the other hand, the facing surface 14f of the short bending piece 14b is formed so that the radially inner portion of the facing surface 14d faces the outside of the core sheet 11, and is concave so that the facing surface 14e of the protruding long bending piece 14a fits. Is formed. The long bending piece 14a and the short bending piece 14b having such shapes need to be simultaneously bent at the time of bending so that the convex facing surface 14e fits into the concave facing surface 14f.
[0054]
Also in this case, while the gap 18 is made sufficiently small over the entire opposing surfaces 14e and 14f, it is possible to prevent the distal ends of the long bent piece 14a and the short bent piece 14b from interfering with each other at the time of bending. Can be further reduced.
[0055]
The embodiments shown in FIGS. 10A to 10C may be applied to any of the first and second embodiments.
[0056]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
According to the invention described in any one of claims 1 to 11, it is possible to provide a core capable of suppressing cogging torque and a method of manufacturing a core sheet used for the core.
[0057]
According to the twelfth aspect of the present invention, it is possible to provide a stator manufacturing method capable of simplifying a winding step of winding a winding and an assembling step of a core.
[Brief description of the drawings]
FIG. 1 is a plan view showing a core sheet according to a first embodiment.
FIG. 2 is a perspective view of a core according to the first embodiment.
FIG. 3 is a partial perspective view of a stator according to the first embodiment.
FIG. 4 is a plan view showing a core sheet according to a second embodiment.
FIG. 5 is an explanatory view showing a method for laminating a core sheet according to a second embodiment.
FIG. 6 is a perspective view of a core according to a second embodiment.
FIG. 7 is a perspective view of a core and a bobbin around which a winding is wound in a second embodiment.
FIG. 8A is a plan view showing a core sheet according to another embodiment.
(B) Explanatory drawing which shows the state at the time of bending a bending piece.
FIG. 9A is a plan view showing a core sheet according to another embodiment.
(B) Explanatory drawing which shows the state at the time of bending a bending piece.
FIG. 10A is a plan view illustrating a main part of a core sheet according to another embodiment.
(B) Explanatory drawing which shows the state at the time of bending a bending piece.
(C) Explanatory drawing which shows the state at the time of bending the bending piece in another embodiment.
[Explanation of symbols]
Reference numeral 11 denotes a core sheet, 13 denotes a tooth, 14 denotes a bent piece forming an outer annular portion, 14a denotes a long bent piece that forms a bent piece, 14b denotes a short bent piece that forms a bent piece, 14c to 14f: an opposing surface, 16 ... Connection part, 18 gap, 21 core, 22 winding, 30 bobbin, 40 stator.

Claims (12)

Teeth extending radially,
A connecting portion for connecting the teeth on the inner diameter side,
A core sheet including a bent piece that extends further from the outer diameter side of the tooth to the outer diameter side and that is bent in the circumferential direction to form an outer annular portion so as to face the bent piece of another tooth is laminated. core. The core according to claim 1,
A gap is formed in the circumferential direction between the bent pieces, and the gap is not continuous with the lamination direction of the core sheet, or the position of the gap is located at the center in the width direction of the teeth. Laminated core. In the core according to claim 1 or claim 2,
The core sheet is provided with the bent pieces formed of two long and short pieces which are bent in opposite directions to one tooth, and is punched and formed in an annular shape, or is formed by linearly punching according to the number of teeth for one sheet. The core is formed in an annular shape, and is obtained by alternately laminating the front and back of this core sheet one by one. In the core according to claim 1 or claim 2,
The bent piece is a core formed on every other tooth. The core according to claim 4,
The core sheet is provided with two bent pieces having the same length in one tooth, and the core sheet is rotated by one tooth and laminated. The core according to any one of claims 1, 2, 4, and 5,
A core in which the core sheet is formed by punching straight, and the core sheet is laminated in a spiral shape. In the core according to claim 1 or claim 2,
The core sheet includes the long and short bent pieces bent in opposite directions to one tooth, and the two long and short bent pieces have the same shape according to the number of teeth for one core sheet. The long and short bent pieces are successively inverted in accordance with the number of the teeth, and a continuous piece of the bent pieces is punched out in a straight line, and the core sheet is formed into a spiral shape. Stacked core. In the core according to any one of claims 1 to 7,
The core sheet is provided with two bent pieces that are bent in opposite directions to one tooth, and opposing surfaces of the bent pieces facing each other at the time of bending are substantially parallel to each other, and with respect to the radial direction of the core sheet. A core that is configured to tilt. The core according to claim 8,
A core, wherein each of the bent pieces is configured such that, when bent, one of the opposing surfaces faces the outside of the core sheet, and the other facing surface faces the inside of the core sheet. The core according to claim 8 or 9,
The opposing surface of each said bending piece is a core comprised by one plane. It is a manufacturing method of the core sheet used for the core of Claim 3, Claim 6 or Claim 7, Comprising:
The core sheet is a method of manufacturing a core sheet in which the teeth enter between the teeth of the other core sheet and are punched straight. A bobbin for securing insulation between a core and a winding is locked to the bent piece before bending the bent piece in the core according to any one of claims 1 to 11, and the bobbin is provided. A method of manufacturing a stator, comprising: winding a winding around a bobbin, attaching the bobbin to the teeth, and bending the bent piece.

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