JP2010035342A - Armature core and armature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an armature core in which teeth are inserted from the outer circumferential side of a yoke and the manufacturing process can be simplified and which the position of the teeth in a diameter direction can easily fixed. <P>SOLUTION: The yoke 11 is provided with a plurality of concave portions 111. The concave portions 111 are opened on one side in a direction parallel to a rotating shaft P and the side opposite to the rotating shaft P in a diameter direction centered at the rotating shaft P. The plurality of teeth 12 are inserted into the concave portions 111 along the diameter direction from the side opposite to the rotating shaft P. A fixing portion 13 individually fixes the positions of the plurality of teeth 12 in the diameter direction from the side opposite to the rotating shaft P for one end of each of the plurality of teeth 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an armature core, and more particularly to a technique for fixing a tooth to a yoke.

  Patent Document 1 describes an axial gap type armature core. The armature core includes a stator yoke and teeth. The stator yoke is provided with a hole penetrating itself in a direction parallel to the rotation axis. The teeth are press-fitted into the holes.

  In addition, the technique regarding this case is described in Patent Documents 2 and 3.

International Publication No. 2004/017488 Pamphlet International Publication No. 03/012956 Pamphlet JP 2007-228790 A

  When a plurality of recesses are provided in the yoke of the axial gap type armature core so as to fit the end portions of the plurality of teeth, each of the recesses opens to one side in the rotation axis direction. Furthermore, if the concave portion is also opened on the opposite side of the rotation axis (the outer periphery side of the yoke) in the radial direction around the rotation axis, the plurality of teeth can be moved from the outer periphery side of the yoke along the radial direction. Each is inserted into a recess.

  However, if the recess opens also on the outer peripheral side, the teeth may come off from the yoke to the outer peripheral side.

  Accordingly, an object of the present invention is to provide an armature core that can easily fix the position of the teeth in the radial direction in the armature core into which the teeth are inserted from the outer peripheral side of the yoke.

  A first aspect of the armature core according to the present invention is annularly arranged around a predetermined axis (P), and is opposite to the axis in one side of the axis and in a radial direction around the axis. A yoke (11) having a plurality of recesses (111) open to the side, a plurality of teeth (12) having both ends in the radial direction and embedded in the plurality of recesses, respectively, in the radial direction A plurality of fixing portions (13) for individually fixing positions of the plurality of teeth in the radial direction from one side opposite to the shaft with respect to one end of the plurality of teeth on the shaft side.

  A second aspect of the armature core according to the present invention is the armature core according to the first aspect, wherein the plurality of fixing portions (13) are the same body as the yoke (11), and the shaft (P) It has the projection shape which latches each of these teeth (12) from the opposite side.

  A third aspect of the armature core according to the present invention is the armature core according to the first aspect, wherein the yoke is at least one side of the shaft at a position where the plurality of recesses are provided. The plurality of teeth each further includes a second hole continuous with the plurality of first holes in a direction along the axis, and the plurality of fixing portions include the first holes. It is a separate body from the yoke (11), each of which is inserted into the first hole and the second hole.

  A fourth aspect of the armature core according to the present invention is the armature core according to the first aspect, wherein the plurality of fixing portions (13) are separate from the yoke (11), The plurality of recesses (111) are respectively inserted and inserted in the direction along the axis (P), and in contact with the plurality of teeth (12) on the opposite side of the axis in the radial direction.

  A fifth aspect of the armature core according to the present invention is the armature core according to the first aspect, wherein the plurality of fixing portions (13) are separate from the yoke (11), Each of the plurality of teeth (12) is urged toward the shaft (P).

  A sixth aspect of the armature core according to the present invention is the armature core according to the fifth aspect, wherein the width of each of the plurality of teeth (12) in the circumferential direction about the axis (P) is provided. (W2) is narrow on the shaft side, the width (W1) of each of the plurality of recesses (111) in the circumferential direction is narrow on the shaft side, and the width of each of the plurality of recesses on the most shaft side is the largest The width of each of the plurality of teeth on the shaft side is narrower.

  A seventh aspect of the armature core according to the present invention is the armature core according to the first aspect, wherein the plurality of fixing portions (13) include the yoke (11) and the plurality of teeth (12). And welded portions provided at locations exposed on the opposite side of the axis (P).

  An eighth aspect of the armature core according to the present invention is the armature core according to any one of the first to seventh aspects, wherein each of the plurality of teeth (12) includes the shaft (P). And a plurality of recesses (111) are engaged with the protrusions in a direction parallel to the axis.

  According to the first aspect of the armature core according to the present invention, the position in the radial direction of the tooth is fixed from the side opposite to the shaft. When the teeth are fixed after the teeth are embedded in the yoke (concave portion), the workability can be improved as compared with the case where the teeth are fixed from the shaft side, and the position of the teeth in the radial direction can be easily fixed.

  According to the 2nd aspect of the armature core which concerns on this invention, since a fixing | fixed part is the same body as a yoke, it is not necessary to manufacture a fixing | fixed part separately. In other words, the fixed portion can be realized by the shape of the yoke. Therefore, an increase in manufacturing cost can be suppressed as compared with the case where the fixing part is manufactured separately.

  According to the 3rd aspect of the armature core which concerns on this invention, since the position in the radial direction of teeth can be fixed by inserting a fixing | fixed part in a recessed part, workability | operativity can be improved.

  According to the 4th aspect of the armature core which concerns on this invention, since the position in the radial direction of teeth can be fixed by inserting a fixing | fixed part in a recessed part, workability | operativity can be improved.

  According to the 5th aspect of the armature core which concerns on this invention, the position of the teeth in radial direction can be fixed more firmly.

  According to the sixth aspect of the armature core according to the present invention, the teeth are biased toward the shaft. Since the width of the concave portion on the most shaft side is narrower than the width of the tooth on the most shaft side, the yoke applies a force in the direction of tightening the teeth in the circumferential direction by elastic deformation. Therefore, the teeth can be more firmly fixed.

  According to the 7th aspect of the armature core which concerns on this invention, the position in the radial direction of teeth can be fixed firmly. In addition, when an armature winding is wound around a tooth to obtain an armature, and when a field element is arranged so as to face the armature with respect to the shaft to obtain a rotating electrical machine, the magnetic flux flowing inside the teeth Flows through the inside of the yoke along the circumferential direction around the axis. Since welding is performed at a location opposite to the shaft, the magnetic flux is less likely to flow through the location, so that deterioration of magnetic characteristics as an armature can be suppressed, and consequently efficiency reduction as a rotating electrical machine can be suppressed.

  According to the eighth aspect of the armature core of the present invention, since the recess engages with the protrusion protruding in the circumferential direction in a direction parallel to the axis, the tooth and the recess can be fixed in the direction parallel to the axis. .

First embodiment.
FIG. 1 shows an example of a conceptual configuration of the armature core according to the first embodiment. FIG. 1 is a top view of the armature core 1 viewed along the rotation axis P. FIG.

  The armature core 1 includes a yoke 11 and a plurality of teeth 12.

  The yoke 11 is, for example, a magnetic body having an annular outer periphery around the rotation axis P. The yoke 11 includes a plurality of recesses 111. The plurality of recesses 111 are annularly arranged around the rotation axis P. The concave portion 111 is opposite to the rotation axis P in one side in an axial direction parallel to the rotation axis P (hereinafter simply referred to as an axial direction) and in a radial direction around the rotation axis P (hereinafter simply referred to as a radial direction). Open to the side (hereinafter also referred to as the outer peripheral side). A more specific shape of the recess 111 will be described later.

  The plurality of teeth 12 are respectively embedded in the plurality of recesses 111. The teeth 12 extend from the recess 111 to one side in the axial direction. An armature winding (not shown) is wound around a portion of the tooth 12 extending from the recess 111 via an insulator (not shown). The teeth 12 may be configured by a plurality of magnetic plates (for example, laminated steel plates) stacked in the radial direction or the circumferential direction. In this case, the eddy current resulting from the magnetic flux flowing along the axial direction in the teeth 12 can be reduced. The same applies to the yoke 11, and for example, it may be constituted by a plurality of magnetic plates (for example, laminated steel plates) laminated in the axial direction. In this case, the eddy current caused by the magnetic flux flowing along the circumferential direction inside the yoke 11 can be reduced.

  FIG. 2 is a conceptual perspective view showing a portion corresponding to one tooth 12 of the armature core shown in FIG. However, in FIG. 2, the yoke 11 and the teeth 12 are shown separated in the radial direction.

  In order to fix the teeth 12 and the yoke 11 in the axial direction, the teeth 12 and the yoke 11 have the following structure. The tooth 12 has a protrusion 121. The protrusion 121 is a position embedded in the recess 111 and protrudes in the circumferential direction around the rotation axis P (hereinafter simply referred to as the circumferential direction). In FIG. 1, a protrusion 121 is provided at the end of the other tooth 12 in the axial direction, that is, at the bottom of the tooth 12. The recess 111 has a protrusion 112 protruding outward as viewed from itself in the circumferential direction. The protrusion 112 is fitted with the protrusion 121. In other words, the recess 111 engages with the protrusion 121 in the axial direction.

  Such an armature core 1 is assembled as follows. That is, the teeth 12 are inserted into the recesses 111 of the yoke 11 along the radial direction by fitting the protrusions 112 and 121 from the outer peripheral side of the yoke 11.

  The armature core 1 includes a plurality of fixing portions (not shown). The plurality of fixing portions individually fix the positions of the plurality of teeth 12 in the radial direction from one side opposite to the rotation axis P with respect to one end of the plurality of teeth 12 positioned on the rotation axis P side in the radial direction. A specific fixing portion will be described in detail later. As a result, the teeth 12 can be prevented from coming off along the radial direction from the outer peripheral side of the yoke 11. Further, when the teeth 12 are fixed after the teeth 12 are embedded in the yoke 11 (recessed portion 111), workability can be improved as compared with the case where the teeth 12 are fixed from the rotating shaft P side, and the position of the teeth 12 in the radial direction can be easily achieved. Can be fixed.

  As an example of a specific fixing portion 13, the fixing portion 13 is the same body as the yoke 11, and has a protruding shape that hooks the teeth 12 from the side opposite to the rotation axis P. FIG. 3 is a top view showing a portion corresponding to one tooth 12 of the armature core 1 having an example of the fixing portion 13. However, in FIG. 2, the tooth 12 has a flange portion that is wide on the side opposite to the yoke 11, but the flange portion is omitted in FIG. 3. Although the collar is not an essential requirement, the operating point of the permanent magnet provided in the field element can be improved.

  The fixing portion 13 is provided at at least one end of the concave portion 111 in the circumferential direction, and has a claw shape protruding toward the teeth 12 side. Then, in a state where the tooth 12 is embedded and disposed in the recess 111, the fixed portion 13 contacts the one end surface 12 a of the tooth 12 on the side opposite to the rotation axis P. Further, the recess 111 does not open on the rotation axis P side in the radial direction. In other words, the teeth 12 are in contact with the yoke 11 on the rotation axis P side in the radial direction.

  In the armature core 1 having such a configuration, the teeth 12 are inserted into the recesses 111 along the radial direction from the outer peripheral side of the yoke 11. At this time, the width in the circumferential direction of the concave portion 111 at the position where the fixing portion 13 exists is pushed wide by the teeth 12. When the tooth 12 is inserted into the recess 111 until it is positioned on the rotation axis P side with respect to the fixed portion 13 in the radial direction, the width returns to the original and the fixed portion 13 comes into contact with the tooth 12 in the radial direction.

  Since the tooth 12 is sandwiched between the yoke 11 and the fixing portion 13 in the radial direction, the position of the tooth 12 in the radial direction can be fixed. Moreover, the position of the teeth 12 in the radial direction can be fixed simply by inserting the teeth 12 into the yoke 11 (recessed portion 111). Therefore, fixing work can be simplified. Further, since the fixing portion 13 is the same body as the yoke 11, it is not necessary to separately manufacture the fixing portion 13, and an increase in manufacturing cost can be suppressed.

  In FIG. 3, the teeth 12 are in contact with the yoke 11 in the radial direction on the rotating shaft P side, but the present invention is not necessarily limited thereto. For example, when the width of the tooth 12 in the circumferential direction is narrow on the rotation axis P side and the width of the recess 111 in the circumferential direction is narrow on the rotation axis P side, the corner on the rotation axis P side of the tooth 12 contacts the yoke 11. Thus, the yoke 11 may support the teeth 12. This also applies to the other aspects described below.

  4 and 5 are partial views of an armature core that is the same body as the yoke 11 and has another example of the fixing portion 13 that has a protruding shape that hooks the teeth 12 from the side opposite to the rotation axis P. A typical configuration is shown. The shape of the fixing portion 13 is deformed before and after fixing the position of the tooth 12 in the radial direction. FIG. 4 shows a state before the teeth 12 are fixed, and FIG. 5 shows a state after the teeth 12 are fixed. However, in FIG. 5, the shape of the fixing portion 13 before fixing is indicated by a two-dot chain line.

  Before the teeth 12 are fixed, the fixing portion 13 is adjacent to the concave portion 111 in the circumferential direction and has a shape protruding to the outer periphery. This will be described more specifically. The fixing portion 13 is sandwiched between the recess 111 and the recess 113 in the circumferential direction. The recess 113 is provided in the yoke 11 and opens to the outer peripheral side in the radial direction. In other words, by providing the recesses 111 and 113, the yoke 11 positioned between them has a shape protruding to the outer periphery. This protruding shape corresponds to the fixed portion 13.

  Further, in a state where the teeth 12 are embedded in the recesses 111, the fixing portion 13 is located on the opposite side of the rotation axis P with respect to the teeth 12. And the fixing | fixed part 13 is bent to the teeth 12 side by using the angle | corner 12c of the teeth 12 nearest to self as a fulcrum. This is shown in FIG. By this bending, the fixing portion 13 contacts the tooth 12 in the radial direction.

  Therefore, since the teeth 12 are sandwiched between the yoke 11 and the fixing portion 13 in the radial direction, the position of the teeth 12 in the radial direction is fixed. Even in this case, since the fixing portion 13 is the same body as the yoke 11, an increase in manufacturing cost can be suppressed.

Second embodiment.
An example of the conceptual configuration of the armature core according to the second embodiment is the same as the armature core shown in FIGS. However, the fixing part is different. FIG. 6 shows a conceptual configuration of an armature core provided with an example of a fixed portion. FIG. 6 shows a cross section along the radial direction of a portion corresponding to one tooth 12 in the armature core 1 in FIG.

  The yoke 11 has a hole 114 passing therethrough in the axial direction at a position where the recess 111 is provided. The tooth 12 has a hole 122 that opens in the axial direction toward the yoke 11. The holes 114 and 122 are continuous in the axial direction. The fixing portion 13 is, for example, a knock pin or a key, and is fitted into the holes 114 and 122. In other words, the fixing portion 13 is embedded in the holes 114 and 122. Moreover, it can be grasped that the fixing portion 13 fixes the position of the tooth 12 in the radial direction from the side opposite to the rotation axis P with respect to the one end 12b of the tooth 12 positioned on the rotation axis P side in the radial direction.

  In such an armature core, the fixing portion 13 can fasten the tooth 12 and the yoke 11, and thus can fix the position of the tooth 12 in the radial direction.

  The fixing portion 13 is fitted into the holes 114 and 122 from the side opposite to the teeth 12 with respect to the yoke 11 in the axial direction. Therefore, even in this case, the work space is wide as compared with the case where the position of the tooth 12 in the radial direction is fixed from the inner peripheral side, and thus workability can be improved.

  The hole 114 does not necessarily have to penetrate the yoke 11. For example, the hole 114 may open to the teeth 12 side in the axial direction, and the hole 122 may penetrate the teeth 12 in the axial direction. In this case, the fixing portion 13 is inserted into the holes 122 and 114 from the side opposite to the yoke 11 with respect to the tooth 12 in the axial direction. However, from the viewpoint of not adversely affecting the air gap between the tooth 12 and the field element when the field element is disposed facing the tooth 12 in the axial direction, the armature core shown in FIG. Is preferred.

  FIG. 7 shows a conceptual configuration of a part of an armature core provided with another example of the fixing portion 13. The fixing portion 13 is separate from the yoke 11, is disposed at a position in contact with the teeth 12 in the radial direction, and is fitted into the concave portion 111 in the direction along the rotation axis P. A specific example will be described with reference to FIG.

  The fixing part 13 is, for example, SMC (Soft Magnetic Composites) or resin. The fixed part 13 has a shape including, for example, a rectangular parallelepiped part and protrusions 131 provided on both opposing surfaces of the rectangular parallelepiped part. Further, the recess 111 includes a protrusion 115 protruding in the circumferential direction at a position opposite to the rotation axis P with respect to the tooth 12. The protrusion 115 is open to the teeth 12 side in the axial direction. And the fixing | fixed part 13 is inserted in the recessed part 111 along the axial direction with the protrusion 131 facing the circumferential direction. More specifically, the protrusion 131 is engaged with the protrusion 115. As a result, the fixing portion 13 is fixed to the yoke 11. Further, in a state where the fixing portion 13 is fitted in the concave portion 111, the fixing portion 13 contacts the teeth 12 in the radial direction.

  Therefore, since the tooth 12 is sandwiched between the yoke 11 and the fixing portion 13 in the radial direction, the position of the tooth 12 in the radial direction can be fixed. Even in this case, since the fixing portion 13 is fixed on the outer peripheral side of the tooth 12, workability can be improved.

  Note that the fixing portion 13 does not necessarily have the protrusion 131, and the radial position of the fixing portion 13 with respect to the yoke 11 is fixed in a state where the fixing portion 13 is fitted in the recess 111. Good.

Third embodiment.
An example of the conceptual configuration of the armature core according to the third embodiment is the same as the armature core shown in FIGS. However, the fixed portion is separate from the yoke 11 and biases the teeth 12 toward the rotation axis P. FIG. 8 shows a conceptual configuration of an armature core provided with an example of such a fixing portion.

  The teeth 12 are provided with holes 123 that pass through the teeth 12 in the radial direction. The hole 123 is provided in a portion of the tooth 12 embedded in, for example, the recess 111. The yoke 11 is provided with a screw hole 116 radially inward with respect to the position where the recess 111 is provided. The screw hole 116 is continuous with the recess 111 and is aligned with the hole 123 on a straight line along the radial direction. The fixing part 13 is, for example, a screw. The fixing portion 13 passes through the hole 123 of the tooth 12 to reach the screw hole 116 and fixes the position of the tooth 12 in the radial direction.

  In such a fixing portion 13 (screw), the teeth 12 are urged toward the rotating shaft P by the tightening. Therefore, the teeth 12 can be more firmly fixed in the radial direction.

  Moreover, it is desirable that the recess 111 and the tooth 12 have the shapes described below. Referring to FIG. 2, the width of tooth 12 in the circumferential direction is narrow on the rotation axis P side in the portion of tooth 12 embedded in recess 111. The width of the recess 111 in the circumferential direction is also narrow on the rotation axis P side. The width W1 of the recess 111 closest to the rotational axis P is narrower than the width W2 of the tooth 12 closest to the rotational axis P.

  The teeth 12 are urged toward the rotation axis P by the fixed portion 13. When the teeth 12 are biased toward the rotation axis P, the yoke 11 applies a force in a direction in which the teeth 12 are tightened in the circumferential direction by elastic deformation. Therefore, the teeth 12 can be fixed more firmly.

  In FIG. 8, the screw hole 116 is provided in the yoke 11, but this is not restrictive. For example, when attaching an inner diameter boss portion holding the yoke 11 on the rotating shaft P side, the screw hole may be provided in the inner diameter boss portion. In this case, for example, a hole 123 that penetrates the teeth 12 in the radial direction, a hole that penetrates the yoke 11 in the radial direction, and a screw hole provided in the inner diameter boss portion are arranged on a straight line along the radial direction. And the fixing | fixed part 13 (screw) penetrates the teeth 12 and the yoke 11, and reaches the screw hole provided in the internal diameter boss | hub part, The position of the radial direction of the teeth 12 is fixed.

  FIG. 9 shows an example of a conceptual configuration of an armature core provided with another example of the fixing portion 13 that urges the teeth 12 toward the rotation axis P side. The fixed part 13 includes a support part 14 and a screw 15. The support part 14 has a shape including, for example, a rectangular parallelepiped part and protrusions 141 provided on both sides of the rectangular parallelepiped part facing in the circumferential direction. Further, the support portion 14 is provided with a screw hole 142 that passes through the support portion 14 along the radial direction.

  The recess 111 includes a protrusion 117 that protrudes in the circumferential direction at a position opposite to the rotation axis P with respect to the tooth 12. The protrusion 117 opens toward the tooth 12 in the axial direction.

  The support portion 14 is fitted into the recess 111 with the protrusion 141 facing in the circumferential direction in a state where the tooth 12 is embedded in the recess 111. More specifically, the protrusion 141 is fitted with the protrusion 117. As a result, the support portion 14 is fixed to the yoke 11 at a position opposite to the rotation axis P with respect to the tooth 12.

  The screw 15 is inserted into the screw hole 142 from the side opposite to the tooth 12 with respect to the support portion 14. The screw 15 reaches the tooth 12 through the screw hole 142 and urges the tooth 12 toward the rotating shaft P side.

  FIG. 10 shows an example of a conceptual configuration of an armature core provided with another example of the fixing portion 13 that biases the teeth 12 toward the rotation axis P side. FIG. 10 shows a top view of the portion corresponding to one tooth viewed along the axial direction.

  The fixed portion 13 includes an elastic member 16 and a support portion 17.

  The support portion 17 is fixed to the yoke 11 on the opposite side of the rotation axis P with respect to the teeth 12 in the radial direction. The support portion 17 and the teeth 12 are separated from each other in the radial direction. As a more specific example, in FIG. 10, the support portion 17 is the same body as the yoke 11 and protrudes toward the teeth 12 along the axial direction. However, since the tooth 12 is inserted along the radial direction with respect to the recess 111, the support portion 17 does not hinder the path through which the tooth 12 passes in the radial direction.

  The elastic member 16 is a leaf spring, for example. The elastic member 16 exists between the support portion 17 and the teeth 12 in the radial direction, and biases the teeth 12 toward the rotation axis P.

  In addition, the support part 17 does not necessarily need to be formed in the same body as the yoke 11, and may have the same shape as the support part 14 shown in FIG. 9, for example.

Fourth embodiment.
An example of the conceptual configuration of the armature core according to the fourth embodiment is the same as the armature core shown in FIGS. However, the fixed portion is a welded portion that is provided at a location that is located at the boundary between the yoke 11 and the plurality of teeth 12 and is exposed on the side opposite to the rotation axis P.

  FIG. 11 shows an example of an armature core provided with such a fixing portion 13. FIG. 11 is a conceptual perspective view showing a portion corresponding to one tooth 12.

  On the boundary between the surface of the yoke 11 and the surface of the tooth 12 that occurs when the tooth 12 is embedded in the recess 111, at a position opposite to the rotation axis P with respect to the tooth 12, The teeth 12 are welded. In addition, the fixing | fixed part 13 should just be provided in at least 1 place or more shown in FIG.

  Any welding method may be adopted, for example, gas welding, arc welding, electroslag welding, electron beam welding, laser welding, resistance welding, forging / friction welding / explosion welding, brazing / soldering, spot welding, Realized by ultrasonic welding. In particular, laser welding is preferable because the amount of heat input is small, and the welding bulge and the welding diameter are small. In addition, plasma arc welding is preferable because precise welding can be realized.

  Since the yoke 11 and the tooth 12 are connected by welding, the yoke 11 and the tooth 12 can be fixed more firmly. Even when welding is performed on the rotation axis P side with respect to the tooth 12, the yoke 11 and the tooth 12 can be firmly fixed, but welding is performed on the opposite side of the rotation axis P with respect to the tooth 12. Therefore, workability can be improved as compared with the case where the rotation axis P is used.

  Further, when an armature winding (not shown) is wound around the tooth 12 to obtain an armature, and a field element is arranged so as to face the armature with respect to the rotation axis P, a rotating electrical machine is obtained. The magnetic flux flowing inside the teeth 12 flows inside the yoke 11 along the circumferential direction around the axis. Since the teeth 12 and the yoke 11 are welded at a location opposite to the rotation axis P, the magnetic flux hardly flows through the location. Therefore, it is possible to suppress the deterioration of the magnetic characteristics as the armature, and consequently suppress the reduction in efficiency as the rotating electric machine.

It is a top view which shows an example of a notional structure of an armature core. It is a perspective view which shows a conceptual example of a part of armature core. It is a top view which shows a conceptual example of the armature core which concerns on 1st Embodiment. It is a top view which shows another conceptual example of the armature core which concerns on 1st Embodiment. It is a top view which shows another conceptual example of the armature core which concerns on 1st Embodiment. It is sectional drawing which shows a conceptual example of the armature core which concerns on 2nd Embodiment. It is a top view which shows another conceptual example of the armature core which concerns on 2nd Embodiment. It is a top view which shows a conceptual example of the armature core which concerns on 3rd Embodiment. It is a top view which shows another conceptual example of the armature core which concerns on 3rd Embodiment. It is a top view which shows another conceptual example of the armature core which concerns on 3rd Embodiment. It is a perspective view which shows a conceptual example of the armature which concerns on 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Armature core 11 Yoke 12 Teeth 13 Fixed part 111 Concave part 121 Projection part P Rotating shaft W1, W2 Width

Claims (8)

A yoke arranged in a ring around a predetermined axis (P) and having a plurality of recesses (111) opened on one side of the axis and on a side opposite to the axis in the radial direction around the axis (11) and
A plurality of teeth (12) having both ends in the radial direction and embedded in the plurality of recesses,
A plurality of fixing portions (13) for individually fixing the positions of the plurality of teeth in the radial direction from one side opposite to the shaft with respect to one end of the plurality of teeth on the shaft side in the radial direction; The armature core (1).   The plurality of fixing portions (13) are the same body as the yoke (11), and have a protruding shape that respectively hooks the plurality of teeth (12) from a side opposite to the shaft (P). The armature core according to 1. The yoke further includes a plurality of first holes that open at least on one side of the shaft at positions where the plurality of recesses are provided,
Each of the plurality of teeth further includes a second hole continuous with the plurality of first holes in a direction along the axis,
The armature core according to claim 1, wherein the plurality of fixing portions are separate from the yoke (11), and each of the fixing portions is fitted into the first hole and the second hole.   The plurality of fixing portions (13) are separate from the yoke (11), and are respectively fitted and inserted into the plurality of concave portions (111) in a direction along the axis (P). 2. The armature core according to claim 1, wherein the armature core is in contact with each of the plurality of teeth on a side opposite to the shaft.   The plurality of fixing portions (13) are separate from the yoke (11), and bias each of the plurality of teeth (12) toward the shaft (P). Armature core. The width (W2) of each of the plurality of teeth (12) in the circumferential direction around the axis (P) is narrow on the axis side,
The width (W1) of each of the plurality of recesses (111) in the circumferential direction is narrow on the shaft side, and the width of each of the plurality of recesses on the most shaft side is the width of each of the plurality of teeth on the most shaft side. The armature core according to claim 5, which is narrower than the width.   The plurality of fixing portions (13) are welded portions provided at locations that are respectively located at boundaries between the yoke (11) and the plurality of teeth (12) and exposed on the side opposite to the shaft (P). The armature core according to claim 1. Each of the plurality of teeth (12) has a protrusion (121) protruding in the circumferential direction around the axis (P),
The armature core according to any one of claims 1 to 7, wherein each of the plurality of recesses (111) is engaged with the protrusion in a direction parallel to the axis.

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