JP2015119516A - Stator core, stator, and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core capable of suppressing increase of magnetic resistance, and a stator, and a motor thereof.SOLUTION: A stator core 21 is constituted by stacking a plurality of annular core sheets 26 and 27 formed by connecting a plurality of teeth constituting sections 26b and 27b with annular yokes 26a and 27a. In the annular yokes 26a and 27a, a plurality of cutouts 26c and 27c are formed at positions between the teeth constituting sections 26b and 27b with openings toward a radially outer or inner direction of the annular yokes 26a and 27a. An auxiliary core section 50 is stacked and arranged so as to be brought into contact with the annular yokes 26a and 27a in the stacking direction and cross over the cutouts 26c and 27c in a circumferential direction.

Description

  The present invention relates to a stator core, a stator, and a motor.

  Conventionally, in the stator core of a motor using a permanent magnet, in order to improve the yield of the material in the press work, the slot shape is press-formed linearly from the manufacturing method in which the raw material plate-like member is press-formed into an annular shape. Then, a manufacturing method in which it is bent into an annular shape or laminated in a spiral shape has been studied (see Patent Document 1).

  In the stator core of Patent Document 1, when bending into an annular shape, a notch is formed at a bending starting point located on the radially inner side to facilitate bending. Moreover, the residual stress of a core material can be relieved by forming a notch part.

JP 2013-93932 A

  By the way, in the above stator core, the notch part is formed in the bending start point of the stator core for easy bending, but there is a possibility that the magnetic path of the stator core is divided by the notch part. This may increase the magnetic resistance and cause a decrease in torque.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a stator core, a stator, and a motor that can suppress an increase in magnetic resistance.

  A stator core that solves the above problems is a stator core that is formed by laminating a plurality of core sheets each having a plurality of teeth constituent portions connected by a yoke, and is open to the yoke inward or outward in the radial direction of the yoke. A plurality of cutout portions are formed between the tooth constituent portions, and the auxiliary core portion is laminated and disposed so as to straddle the cutout portions in the circumferential direction.

  According to this configuration, by having the auxiliary core portion straddling the notch portion in the circumferential direction, even if magnetic saturation occurs in the vicinity of the notch portion, a magnetic path is formed in the auxiliary core portion, thereby increasing the magnetic resistance. Can be suppressed.

In the stator core, the auxiliary core portion is preferably formed in an annular shape.
According to this configuration, the auxiliary core portion is formed in a relatively simple annular shape.
In the stator core, it is preferable that a plurality of the auxiliary core portions are stacked.

According to this configuration, it is easy to change the thickness (length in the stacking direction) of the auxiliary core portion only by changing the number of auxiliary core portions.
In the stator core, it is preferable that the auxiliary core portion is formed by annularly forming a long member.

According to this configuration, it is possible to improve the yield of the material by forming the auxiliary core portion in an annular shape from the long member.
Moreover, the stator which solves the said subject is provided with the stator core in any one of the said, and the armature winding with which this stator core is mounted | worn.

According to this configuration, it is possible to provide a stator in which an increase in the magnetic resistance of the stator core is suppressed.
Moreover, the motor which solves the said subject is provided with the said stator and the rotor which opposes this stator in radial direction.

  According to this configuration, it is possible to provide a motor that suppresses an increase in the magnetic resistance of the stator core.

  According to the stator core, the stator, and the motor of the present invention, it is possible to suppress an increase in the magnetic resistance of the stator core having the notch portion.

It is a schematic cross section of the motor of one embodiment. It is a top view of the stator of the same form. (A) is sectional drawing for demonstrating the magnetic board of the same form, (b) is a front view for demonstrating the rotor opposing part of the magnetic board of the same form. It is a disassembled perspective view of the stator core of the same form. It is explanatory drawing for demonstrating the manufacturing method of the stator core of the form. It is a disassembled perspective view for demonstrating the manufacturing method of the stator core of the same form. It is a top view for demonstrating the manufacturing method of the stator core of the same form. It is a schematic cross section of the stator core of the same form. It is a top view which expands and shows the stator of the same form partially. It is a schematic cross section which shows the bending part of the segment conductor of the same form. It is a schematic cross section which expands and shows a part of motor of the same form. It is a graph which shows the relationship between the thickness of an auxiliary core part, and a torque. It is a disassembled perspective view of the stator core of another example. It is a top view of the stator of another example. It is a partial exploded perspective view of a stator core same as the above. It is a partial enlarged plan view of a stator core same as the above. It is a top view of the stator of another example. It is a partial exploded perspective view of a stator core same as the above. It is a partial enlarged plan view of a stator core same as the above. It is a schematic cross section which expands and shows the motor of another example partially. It is a schematic cross section which expands and shows the motor of another example partially.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor 10 of the present embodiment is configured by arranging a rotor 14 inside an annular stator 13 that is sandwiched between a rear frame 11 and a front frame 12 in the axial direction of the motor 10. A frame that holds the axial output side (a joint 63 side described later) of the motor 10 is a front frame 12, and a frame that holds an axially opposite output side is a rear frame 11. The frames 11 and 12 are fastened and fixed by through bolts 15 at positions on the outer peripheral side of the stator 13 so as not to be separated from each other.

[flame]
The rear frame 11 and the front frame 12 are formed of a metal material such as aluminum or steel. The rear frame 11 includes a substantially disc-shaped main body portion 11a, and a cylindrical stator holding portion 11b extending in the axial direction of the motor 10 from the outer peripheral edge of the main body portion 11a. One of the front frames 12 has a substantially similar configuration, and includes a substantially disc-shaped main body 12a and an annular stator holding portion 12b extending in the axial direction of the motor 10 from the outer peripheral edge of the main body 12a. Yes. Bearings 16 and 17 arranged coaxially are held at the radial center of the main body portions 11a and 12a of the respective frames 11 and 12, and a rotating shaft 18 of the rotor 14 is pivotally supported by the bearings 16 and 17. ing.

  Fastening and fixing portions 11c and 12c extending outward in the radial direction from a plurality of locations (for example, two locations) on the outer peripheral edge are formed on the main body portions 11a and 12a of the frames 11 and 12, respectively. In FIG. 1, only one fastening fixing portion 11c, 12c provided in the circumferential direction is illustrated. The same number of fastening fixing portions 11c on the rear frame 11 side and fastening fixing portions 12c on the front frame 12 side are provided, and are opposed to each other in the axial direction of the rotary shaft 18. Then, the fastening fixing portions 11 c and 12 c that make a pair are fastened and fixed by the through bolts 15, so that the frames 11 and 12 are fixed to each other with the stator 13 sandwiched therebetween.

[Stator]
The stator 13 includes an annular stator core 21 sandwiched between the stator holding portions 11 b and 12 b of the frames 11 and 12, and an armature winding 22 attached to the stator core 21.

  As shown in FIGS. 2 and 9, the stator core 21 includes a cylindrical portion 23 that forms the outer periphery thereof, and a plurality (60 in the present embodiment) of teeth 24 that extend radially inward from the cylindrical portion 23. Consists of. Each tooth 24 is formed with a radially extending portion 24a having a tapered shape whose width in the circumferential direction becomes narrower toward the inner side in the radial direction, and the distal end portion (the radially inner end portion) of each radially extending portion 24a. A wide portion 24b having a wider width in the circumferential direction than the radially extending portion 24a is formed. Both end surfaces in the circumferential direction of the radially extending portion 24a have a planar shape parallel to the axis L1 of the rotating shaft 18, and circumferential end surfaces adjacent to each other in the circumferential direction are parallel to each other.

  A space between the teeth 24 is configured as a slot portion S that is a portion that accommodates the segment conductor 25 that constitutes the armature winding 22. That is, the slot portion S is configured by the circumferential side surface of the tooth 24 and the inner peripheral surface of the cylindrical portion 23 between the teeth 24. In the present embodiment, since the teeth 24 are formed so that the circumferential end surfaces of the radially extending portions 24a adjacent to each other in the circumferential direction are parallel to each other, each slot portion S has a substantially rectangular shape when viewed in the axial direction. It is configured as follows. Each slot portion S has a shape that penetrates the stator core 21 along the axial direction and opens radially inward. The number of slot portions S formed in the stator core 21 is the same as that of the teeth 24 (60 in this embodiment).

[Stator core]
The stator core 21 having the above shape is formed by stacking and integrating a plurality of steel plates.

  More specifically, as shown in FIG. 4, the stator core 21 is a main core formed by laminating and integrating a plurality of first annular core sheets 26 and second annular core sheets 27 in the axial direction. It comprises a core portion 31, a magnetic plate 40 fixed to each axial end of the main core portion 31, and a substantially annular auxiliary core portion 50. In the present embodiment, each magnetic plate 40 has the same shape, and one magnetic plate 40 is provided on each side of the main core portion 31 in the axial direction.

  The first and second annular core sheets 26 and 27 are connected to each other by annular annular yokes 26a and 27a and annular yokes 26a and 27a, respectively, and extend radially inward (rotor 14 side) from the annular yokes 26a and 27a. A plurality of teeth constituting portions 26b, 27b. The first and second annular core sheets 26 and 27 are formed of a cold-rolled steel plate (SPC material such as SPCC).

  As shown in FIG. 2, the teeth constituent portions 26b and 27b are formed such that the circumferential width becomes narrower from the radially outer side to the midway position on the radially inner side from the radially inner side (the rotor 14 side). Each of the annular core sheets 26 and 27 is laminated so that the tooth constituent portions 26b and 27b overlap in the axial direction. Further, the annular core sheets 26 and 27 of the main core portion 31 are arranged so that the plate surfaces are orthogonal to the axial direction.

As shown in FIGS. 5 and 6, the first and second annular core sheets 26, 27 are formed in an annular shape by bending the strip-shaped core sheets 28, 29 punched from the strip-shaped strip steel sheet 30.
As shown in FIGS. 4, 6 and 7, the first annular core sheet 26 has a first notch 26c radially inward at a substantially intermediate position in the circumferential direction between the teeth constituting portions 26b of the annular yoke 26a. It is formed. The first cutout portion 26c is formed by cutting out longer than half of the radial length of the annular yoke 26a.

  As shown in FIGS. 4, 6 and 7, the second annular core sheet 27 has a second cutout portion 27 c on the radially outer side at a substantially intermediate position in the circumferential direction between the tooth constituent portions 27 b of the annular yoke 27 a. It is formed. The second cutout portion 27c is formed by cutting out longer than half the radial length of the annular yoke 27a. For this reason, as shown in FIG. 7, the second cutout portion 27c has a radially inner portion overlapping with a radially outer portion of the first cutout portion 26c in the axial direction.

  As shown in FIGS. 2, 4, and 9, the magnetic plate 40 is formed by press working, and an annular ring stacked on each of the annular core sheets 26 and 27 at both axial ends of the main core portion 31. A plate-like laminated portion 41 is provided. The laminated portion 41 is laminated so as to be substantially parallel and substantially coaxial with the annular core sheets 26 and 27 of the main core portion 31. Further, the magnetic plate 40 is set such that the plate thickness T1 is larger than the plate thickness T2 of each of the annular core sheets 26 and 27 of the main core portion 31 (see FIG. 1).

  The laminated portion 41 includes an annular yoke 42 that forms an annular shape that overlaps the annular yokes 26 a and 27 a of the annular core sheets 26 and 27 in the axial direction, and a plurality of teeth constituent portions 43 that extend radially inward from the annular yoke 42. Is formed. The teeth constituent part 43 of the laminated part 41 has substantially the same shape as the tooth constituent parts 26b, 27b of the annular core sheets 26, 27 in the axial direction.

  The magnetic plate 40 is provided so that the annular yoke 42 and the teeth constituent portion 43 of the laminated portion 41 overlap with the annular yokes 26a and 27a and the tooth constituent portions 26b and 27b of the annular core sheets 26 and 27, respectively. Yes. The annular core sheets 26 and 27 and the annular yokes 26 a, 27 a and 42 of the magnetic plate 40 constitute the cylindrical portion 23 of the stator core 21, and the tooth constituent portions 26 b, 27 b and 43 constitute the teeth 24 of the stator core 21. ing. Further, the outer diameter of the annular yoke 42 of the laminated portion 41 is formed smaller than the outer diameter of the annular yokes 26a, 27a of the respective annular core sheets 26, 27.

At the radially inner end (rotor 14 side end) of the teeth constituting portion 43 of the magnetic plate 40, there is a rotor facing portion 44 as an extending portion extending outward in the axial direction (on the side opposite to the main core portion). doing.
The rotor facing portion 44 is formed by bending the radially inner end portion of the tooth constituent portion 43 substantially at right angles (90 degrees) outward in the axial direction. That is, the magnetic plate 40 is formed such that the plate surface faces the radial direction by the rotor facing portion 44 that is bent outward in the axial direction. Note that the inner diameter surface of the rotor facing portion 44 is curved so as to have the same diameter as the inner diameter of the main core portion 31 (the annular core sheets 26 and 27). Further, the axial thickness of the laminated portion 41 and the radial thickness of the rotor facing portion 44 are determined by the plate thickness T1 of the magnetic plate 40, which are equal to each other. Further, the thickness of the bent portion between the rotor facing portion 44 and the tooth constituting portion 43 (the corner portion formed by the tooth constituting portion 43 and the rotor facing portion 44) is the plate thickness (that is, the magnetic plate) of the rotor facing portion 44. It is formed to be thicker than the plate thickness T1) of 40.

  As shown in FIGS. 3A and 3B, the rotor facing portion 44 has side edge portions 44a and 44b as circumferential side portions on both sides in the circumferential direction. The side edge portions 44a and 44b are shaped to be inclined with respect to the direction of the axis L1 (axial direction) of the rotating shaft 18. The side edge portions 44a and 44b are inclined so as to approach the circumferential center side of the rotor facing portion 44 toward the outer side in the axial direction (on the side opposite to the laminated portion 41). The side edge 44a on the one circumferential side and the side edge 44b on the other circumferential side are symmetric with respect to an imaginary line L2 (straight line along the axis L1) passing through the center in the circumferential direction of the rotor facing portion 44. It is formed to have a shape. For this reason, the rotor facing portion 44 has a circumferential width on the proximal end side in the axial direction (axially inner side) and a circumferential width of the distal end portion of the teeth constituting portions 26b, 27b, 43 constituting the wide portion 24b of the tooth 24. Equally formed, the circumferential width is narrower toward the tip end side in the axial direction (outside in the axial direction), and the trapezoidal shape is formed in the radial direction. In addition, each rotor opposing part 44 of this embodiment is formed so that all may make the same shape. As shown in FIG. 3 (b), the rotor facing portion 44 has the inclined surfaces of the side edge portions 44a and 44b that are linear, and the inclination angle θ2 is based on the radiation angle θ1 (see FIG. 9) of the teeth constituting portion 43. Is also made small.

  As shown in FIGS. 4 and 8, each annular yoke 26 a, 27 a, 42 of each annular core sheet 26, 27 and magnetic plate laminated portion 41 is pressed with a convex portion 45 (a dowel) protruding in the thickness direction. It is formed by processing. In each of the annular yokes 26a, 27a, 42, a plurality of convex portions 45 are formed in the circumferential direction (four in the present embodiment). Each annular yoke 26 a, 27 a, 42 has a recess 46 formed on the back side of each projection 45 when the projection 45 is formed. And each convex part 45 is press-fitted and fixed (caulking fixed) to the concave part 46 of each annular core sheet 26, 27 adjacent in the axial direction. Accordingly, the annular core sheets 26 and 27 are integrated to form the main core portion 31, and the magnetic plates 40 are fixed to both sides of the main core portion 31 in the axial direction.

  As shown in FIG. 9, a sheet-like insulating member 47 made of an insulating resin material is mounted in each slot portion S of the stator core 21. Each insulating member 47 is provided in a state of being folded back at the radially outer end of the slot portion S, and is formed along the inner peripheral surface of the slot portion S. Each insulating member 47 is inserted into the slot portion S in the axial direction, and the axial length of the insulating member 47 is set longer than the axial length of the slot portion S. That is, both end portions in the axial direction of the insulating member 47 protrude outward from both end portions in the axial direction of the slot portion S.

  As shown in FIGS. 4 and 11, the auxiliary core portion 50 is provided on the outer side in the axial direction of the magnetic plate 40. The auxiliary core portion 50 is formed in an annular shape, and is formed of a cold-rolled steel plate (SPC material such as SPCC) in the same manner as the annular core sheets 26 and 27. The auxiliary core portion 50 is formed in an annular shape by bending a long member into an annular shape. The auxiliary core portion 50 is fixed to the outer side in the axial direction of the magnetic plate 40 by, for example, welding.

[Armature winding]
As shown in FIGS. 9 and 11, the armature winding 22 mounted on the stator core 21 is composed of a plurality of segment conductors 25 (segment conductors). The segment conductors 25 are connected with predetermined ones to form a three-phase (U-phase, V-phase, W-phase) Y-connected armature winding 22. Each segment conductor 25 is formed from a wire having the same cross-sectional shape (rectangular cross-section).

  Each segment conductor 25 includes a pair of straight portions 51 that are portions inserted into the slot portion S, a first projecting portion 52 that projects from the slot portion S to one axial side (the rear frame 11 side), and a slot portion. The second protrusion 53 protrudes from S to the other side in the axial direction (front frame 12 side), and has a substantially U shape that is folded back on the first protrusion 52 side. Further, the first and second projecting portions 52 and 53 are opposed to the rotor facing portion 44 of the magnetic plate 40 in the radial direction.

  The pair of linear portions 51 are formed so that their radial positions are shifted from each other, and are inserted into the slot portions S having different circumferential positions. The straight portion 51 is disposed inside the insulating member 47 in the slot portion S (see FIG. 9). The segment conductor 25 and the stator core 21 are electrically insulated by the insulating member 47.

  The segment conductors 25 are arranged in the slot portions S so that four straight portions 51 are arranged in the radial direction. In the segment conductor 25, two linear portions 51 are arranged on the first and fourth from the inner side in the radial direction (the segment conductor 25x illustrated on the outer side in FIG. 11), and the two linear portions 51. Are arranged in the second and third from the inner side in the radial direction (segment conductor 25y shown inside in FIG. 11). The armature winding 22 is mainly composed of the two types of segment conductors 25x and 25y. For example, the segments constituting the end of the armature winding 22 (power supply connection terminal, neutral point connection terminal, etc.) Another type of conductor (for example, a segment conductor having only one straight portion) is used.

  Each straight portion 51 includes a second protrusion 53 that extends through the slot S in the axial direction and protrudes toward the front frame 12, and is bent in the circumferential direction so that the straight portions 51 of the other segment conductors 25 and a special type are provided. The segment conductors 25 are electrically connected by welding or the like, whereby the segment conductors 25 constitute the armature windings 22.

  Further, the first and second projecting portions 52 and 53 of the segment conductor 25 are bent in the circumferential direction with respect to the straight portion 51 at both axial ends of the slot portion S. Here, FIG. 10 shows an enlarged view of the vicinity of the end portion in the axial direction of the slot portion S where the first projecting portion 52 is bent in the circumferential direction. As shown in the figure, a chamfered portion 43 a that is chamfered in an arc shape is formed at a corner portion of the teeth constituting portion 43 of the magnetic plate 40 (laminated portion 41) that constitutes one axial end of the slot portion S. . Similarly, the chamfered portion 43 a is formed at the corner of the tooth constituting portion 43 that constitutes the other axial end of the slot portion S in the magnetic plate 40 on the second projecting portion 53 side. The chamfered portion 43a has an arc shape along the circumferentially bent shape of the first and second projecting portions 52 and 53, and comes into contact with the bent portion over a wide area. Thereby, it is suppressed that force is locally applied from the corner portion of the tooth constituent portion 43 to the bent portions in the circumferential direction of the first and second projecting portions 52 and 53, and damage to the bent portions is suppressed. It has become so. Similarly, damage to the insulating member 47 sandwiched between the bent portions of the first and second projecting portions 52 and 53 and the chamfered portion 43a is also suppressed. In this embodiment, since the plate thickness T1 of the magnetic plate 40 (the plate thickness of the teeth constituent portion 43) is thicker than the plate thickness T2 of the respective annular core sheets 26 and 27, the curvature radius Rm of the chamfered portion 43a is set to each annular shape. It can be set larger than the plate thickness T2 of the core sheets 26 and 27. Thereby, damage to the bent part of the segment conductor 25 is more suitably suppressed by the chamfered portion 43a having a large curvature radius Rm.

  Moreover, as shown in FIG. 11, the 1st protrusion part 52 in which the folding | returning part 25a of the segment conductor 25 was formed is formed so that it may incline (expand) radially outward. Thus, the folded portion 25a is biased radially outward from the radial center of the slot portion S, and the radially inner end portion 52a of the first projecting portion 52 is larger in diameter than the radially inner end portion Sa of the slot portion S. It is configured to be located outside in the direction. Thereby, since the gap between the radial direction of the 1st protrusion part 52 and the rotor opposing part 44 of the magnetic board 40 is comprised widely, interference with the 1st protrusion part 52 and the rotor opposing part 44 is suppressed more suitably. ing. As a result, not only the insulation between the segment conductor 25 and the rotor facing portion 44 is more preferably ensured, but also the cogging torque is increased and output due to the deformation of the rotor facing portion 44 due to the interference with the first protrusion 52. The decline of the is suppressed.

  As shown in FIG. 11, the second protruding portion 53 of the segment conductor 25 is not formed with a folded portion, and the second protruding portions 53 are opposed to each other because the second protruding portions 53 are welded together. A gap with the portion 44 can be easily secured. Further, the welded portion of the second projecting portion 53 is formed on the outer side in the axial direction (on the side opposite to the main core portion) of the front end portion in the axial direction of the rotor facing portion 44 on the front frame 12 side. Thereby, in the welding operation of the second projecting portion 53, the rotor facing portion 44 is less likely to become an obstacle, and workability is improved, and insulation between the second projecting portion 53 and the rotor facing portion 44 is more reliably ensured. It is possible. The welding portion of the second protrusion 53 may be set on the axially inner side (the main core portion 31 side) of the front end portion of the rotor facing portion 44 on the front frame 12 side, in this case, Since the 2nd protrusion part 53 can be comprised so that it may not protrude outside an axial direction rather than the rotor opposing part 44, it can contribute to size reduction of the stator 13 in the axial direction.

[Stator core retention structure]
As shown in FIG. 1, the stator holding portions 11 b and 12 b of the frames 11 and 12 holding the stator 13 having the above-described configuration have a cylindrical shape extending in the axial direction from the main body portions 11 a and 12 a of the frames 11 and 12. There is no. The outer diameters of the stator holding portions 11 b and 12 b are formed larger than the outer diameter of the main core portion 31. The inner diameters of the stator holding portions 11b and 12b are smaller than the outer diameter of the main core portion 31 and larger than the outer diameter of the magnetic plate 40 (laminated portion 41).

  As shown in FIG. 11, outer fitting portions 11d and 12d are formed at the tip portions (inner ends in the axial direction) of the stator holding portions 11b and 12b, respectively. Each of the outer fitting portions 11d and 12d is a portion where the radial thickness is reduced by increasing the inner diameter of the stator holding portions 11b and 12b, and has an annular shape. The inner diameters of the outer fitting portions 11d and 12d are formed to be substantially equal to the outer diameter of the main core portion 31, and a contact surface having a planar shape perpendicular to the axial direction is formed on the radially inner side of the outer fitting portions 11d and 12d. 11e and 12e are formed.

  In the stator core 21, the annular auxiliary core portion 50 is sandwiched between the stator holding portions 11 b and 12 b of the frames 11 and 12. Specifically, the stator holding portions 11b and 12b have outer fitting portions 11d and 12d fitted on the outer peripheral edges of the main core portion 31, the magnetic plate 40, and the auxiliary core portion 50, respectively, and the contact surfaces 11e and 12e are magnetic. The auxiliary core portions 50 on the axially outer side of the plate 40 are in contact with each other in the axial direction. In this state, the frames 11 and 12 are connected and fixed to each other by the through bolts 15, whereby the main core portion 31 is held in the axial direction by the stator holding portions 11b and 12b. Further, the outer peripheral surface of the main core portion 31 of the stator core 21 is exposed to the outside from between the front end portions of the stator holding portions 11b and 12b.

[Rotor]
As shown in FIGS. 1, 2, and 11, the rotor 14 includes a rotating shaft 18 that is supported by bearings 16 and 17, a cylindrical rotor core 61 that is fixed to the rotating shaft 18 so as to be integrally rotatable, and a rotor core. The plurality of (10 in the present embodiment) field magnets 62 are fixed to the outer peripheral surface of 61. Each field magnet 62 is made of, for example, a ferrite magnet, and is arranged so that magnetic poles (N pole and S pole) are alternately different in the circumferential direction. Each field magnet 62 is a so-called segment magnet fixed to the outer peripheral surface of the rotor core 61 with a gap in the circumferential direction.

  The axial lengths of the rotor core 61 and the field magnet 62 of the rotor 14 are the axial lengths of the inner peripheral ends of the stator core 21 (that is, from the tip of the rotor facing portion 44 of one magnetic plate 40 to the other magnetic plate 40). The length of the rotor facing portion 44 is set to be long. That is, the field magnet 62 is opposed to the inner peripheral surface of the main core portion 31 of the stator core 21 and the rotor facing portion 44 of each magnetic plate 40 in the radial direction.

  As shown in FIG. 1, the distal end portion (the left end portion in FIG. 1) of the rotating shaft 18 passes through the front frame 12 and protrudes outside the motor 10. A joint 63 that rotates integrally with the rotary shaft 18 is provided at the tip of the rotary shaft 18. The joint 63 is connected to an external device (not shown) and transmits the rotation of the rotary shaft 18 to the external device.

[Production method]
Next, the manufacturing method of the stator core 21 of this embodiment is demonstrated.
The first and second annular core sheets 26 and 27 of the stator core 21 of the present embodiment are formed by press punching from the strip steel plate 30 as shown in FIG.

  For example, the first and second strip-shaped core sheets having strip-shaped yokes 28a and 29a that are long in one direction and teeth constituent portions 28b and 29b that extend from the short-side ends of the strip-shaped yokes 28a and 29a from the strip-shaped steel plate 30. 28 and 29 are formed by punching. At this time, the first notch portion 28c opening in the extending direction side of the tooth constituent portion 28b is formed at the end portion on the tooth constituent portion 28b side in the first band-shaped core sheet 28 by press punching. In addition, the second band-shaped core sheet 29 is formed by press punching at the end opposite to the teeth constituting portion 29b at the second notch 29c that opens to the opposite side to the extending direction of the teeth constituting portion 29b. The

  At this time, as shown in FIG. 5, the first belt-like core sheet 28 and the second belt-like core sheet 29 are formed so as to form a comb blade shape. The portions 28b and the teeth constituting portions 29b of the second strip-shaped core sheet 29 can be punched and formed so as to alternate in the longitudinal direction of the strip-shaped steel plate 30.

Next, the first and second belt-like core sheets 28 and 29 are formed with a convex portion 45 and a concave portion 46 (both see FIG. 4).
Next, the first and second strip-shaped core sheets 28 and 29 formed by punching are individually bent. Specifically, when the first and second belt-like core sheets 28 and 29 are bent and formed into an annular shape, the teeth constituting portions 28b and 29b (the tooth constituting portions 26b of the first and second annular core sheets 26 and 27, 27b) is bent so as to face radially inward and is circularized. Thus, the first belt-like core sheet 28 is used as the first annular core sheet 26, and the second belt-like core sheet 29 is used as the second annular core sheet 27. At this time, the first notch portion 26c formed in the annular yoke 26a of the first annular core sheet 26 is located on the radially inner side so that the first notch portion 26c is closed by bending (center in the circumferential direction). Deform) At that time, the starting point X1 of the bending process is compressed in the circumferential direction and swells in the axial direction. Moreover, the 2nd notch part 27c formed in the annular yoke 27a of the 2nd annular core sheet 27 is located in the radial direction outer side, and it deform | transforms so that the 2nd notch part 27c may spread by bending. At that time, the bending start point X2 is compressed in the circumferential direction and swells in the axial direction.

  And the 1st annular core sheet 26 and the 2nd annular core sheet 27 are laminated alternately. At this time, the first notch portions 26c formed between the tooth constituent portions 26b adjacent to each other in the circumferential direction by stacking the tooth constituent portions 26b and 27b of the annular core sheets 26 and 27 so as to overlap each other in the axial direction. And the 2nd notch part 27c formed between the teeth structure parts 27b adjacent to the circumferential direction will partly overlap in an axial direction. For this reason, the bulge of the axial direction (lamination direction) which arises at the starting point X1 near the 1st notch part 26c by bending can be inserted in the 2nd notch part 27c. Further, the bulge in the axial direction (lamination direction) generated at the starting point X2 by bending can be inserted into the first cutout portion 26c.

  Further, the convex portion 45 formed in the first annular core sheet 26 is press-fitted into the concave portion 46 formed in the second annular core sheet 27, and the convex portion 45 formed in the second annular core sheet 27 is the first It is press-fitted into a recess 46 formed in the annular core sheet 26. Thereby, the annular core sheets 26 and 27 are caulked (press-fitted) and fixed to complete the main core portion 31.

  Thereafter, the magnetic plate 40 having the rotor facing portion 44 is attached to both sides of the main core portion 31 in the axial direction. At this time, as shown in FIG. 8, the convex portion 45 formed on the magnetic plate 40 on one axial side of the main core portion 31 is press-fitted into the concave portion 46 of the first annular core sheet 26, and the shaft of the main core portion 31 is inserted. The convex portion 45 of the second annular core sheet 27 is press-fitted into the concave portion 46 formed in the magnetic plate 40 on the other side in the direction. As a result, the magnetic plate 40 is attached to the main core portion 31.

  The annular auxiliary core portion 50 is welded and fixed to both sides of the main core portion 31 in the axial direction and radially outward (outer peripheral side) of the magnetic plate 40 (annular yoke 42), thereby completing the stator core 21.

Next, the operation of this embodiment will be described.
The magnetic field generated by energizing the armature winding 22 of the stator 13 and the magnetic field of the field magnet 62 of the rotor 14 act via the inner peripheral surface of the main core portion 31 and the rotor facing portion 44 of each magnetic plate 40. As a result, the rotor 14 rotates. In this embodiment, since the plate thickness T1 of the magnetic plate 40 is set to be thicker than the plate thickness T2 of each of the annular core sheets 26 and 27, magnetic saturation in the magnetic plate 40 hardly occurs, and the magnetic plate 40 is This makes it easier to capture magnetism.

  At this time, a magnetic field (magnetic flux) generated by energizing the armature winding 22 passes through the stator core 21. However, since the first and second cutout portions 26c and 27c are formed, the magnetic path is divided and the magnetic resistance is increased. Therefore, in the present embodiment, a magnetic path is formed by the magnetic plate 40 and the annular auxiliary core portion 50 provided on the outer side in the axial direction of the magnetic plate 40, so that the magnetic resistance is increased by dividing the magnetic path. It is possible to suppress such things.

  Also, as shown in FIG. 12, the auxiliary core 50 has a motor torque that increases as the axial thickness (plate thickness T1) increases. By making the directional thickness (plate thickness T1) thicker than the plate thickness T2 of each of the annular core sheets 26 and 27, it is possible to contribute to the improvement of the motor torque.

  Further, the rotor facing portion 44 of each magnetic plate 40 is formed so as to extend in the axial direction from the rotor 14 side end portion (radially inner end portion) of the teeth 24 of the stator core 21. As a result, the stacking thickness of the main core portion 31 can be suppressed while ensuring the axial length of the surface facing the rotor 14 of the stator core 21 (inner peripheral surface of the stator core 21) to achieve high output. ing. And since the fluctuation | variation (tolerance) of the thickness of the main core part 31 is restrained few by suppressing the thickness of the main core part 31, the space | interval of the axial direction of each flame | frame 11 and 12 which sandwiches the main core part 31 is suppressed. Thus, fluctuations in the axial dimension of the entire motor 10 are suppressed.

  Further, the variation (tolerance) of the magnetic plate 40 increases as the plate thickness T1 increases. However, as in the present embodiment, each of the frames 11 and 12 sandwiches only the main core portion 31 to form the magnetic plate 40. Is configured so as not to abut in the axial direction, so that fluctuations in the axial dimension of the entire motor 10 can be further suppressed.

  Further, in the configuration in which the segment conductor 25 is used for the armature winding 22, the number of slot portions S (the number of teeth 24) that accommodate the segment conductor 25 is large, and the circumferential width of the teeth 24 tends to be narrowed. For this reason, in order to increase the area of the surface (radial inner end surface) facing the rotor 14 in the teeth 24 to improve the output, the rotor facing portion 44 is used to increase the output in the radial direction of the teeth 24 as in the present embodiment. A configuration in which the end face extends in the axial direction is suitable. Further, the tooth 24 of the present embodiment has a configuration in which the magnetic concentration is easily concentrated at the boundary portion between the radially extending portion 24a and the wide portion 24b in which the circumferential width becomes narrower toward the inner peripheral side. Since the stacked portions 41 overlap, the magnetic concentration is relaxed.

Next, the effect of this embodiment will be described.
(1) By having the auxiliary core portion 50 straddling the first and second cutout portions 26c and 27c in the circumferential direction, even if magnetic saturation occurs in the vicinity of the cutout portions 26c and 27c, the magnetic path to the auxiliary core portion 50 Therefore, an increase in magnetoresistance can be suppressed. As a result, the motor torque can be increased.

(2) Since the auxiliary core part 50 is formed in a relatively simple annular shape, it can be easily formed.
(3) Since the auxiliary core portion 50 is formed in an annular shape from a long member, the yield of the material can be improved.

  (4) Since the bulge in the axial direction can be accommodated by the second cutout portion 27c, an increase in dimension in the stacking direction (axial direction) of the stator core 21 can be suppressed, and variation in dimensions can be suppressed.

  (5) Further, in order to prevent the material from expanding in the axial direction, a method of pressing the core in the axial direction during the bending process and performing the length, and the annular core sheets 26 and 27 (each of the strip-shaped core sheets 28 and 29) Although the method of crushing a notch part beforehand and making it into a concave shape, etc. can be considered when carrying out the press punching of these, any method may lead to an increase in a man-hour and an installation. Therefore, as in the present embodiment, the first annular core sheet 26 and the second annular core sheet 27 are laminated so that the first cutout portions 26c and the second cutout portions 27c alternate in the lamination direction. Thus, the step of crushing the vicinity of the notches 26c and 27c can be omitted.

  (6) By having the first cutout portion 26c, the bending process when the ring is formed can be facilitated, and the bending start point X1 bulging in the axial direction at the time of the bending process is used as the second cutout as the housing part. It can be accommodated in the portion 27c, and an increase in dimension in the stacking direction (axial direction) of the stator core 21 can be suppressed, and variation in dimensions can be suppressed. In addition, it is possible to insert an axial bulge (meat escape) generated at the notch in the second annular core sheet 27 having the second notch 27c into the first notch 26c. As a result, an increase in dimension in the stacking direction (axial direction) of the stator core 21 can be suppressed, and variation in dimensions can be suppressed.

  (7) Since the second cutout portions 27c and the first cutout portions 26c are stacked alternately, the increase in the dimension of the stator core in the stacking direction (axial direction) can be suppressed more reliably. Can be suppressed.

  (8) Since the second cutout portion 27c has a cutout shape that opens radially opposite to the first cutout portion 26c, the teeth constituent portions 26b and 27b (tooth constituent portions 28b and 29b, for example, are formed from a steel plate by press forming. ) And other parts can be formed simultaneously.

(9) Since the first and second annular core sheets 26 and 27 are cold-rolled steel sheets, the bending work can be facilitated because the rigidity is lower than that of, for example, a silicon steel sheet.
(10) The axial length of the surface of the stator core 21 facing the rotor 14 can be secured by the rotor facing portion 44, and the magnetic resistance of the annular yokes 26a, 27a formed with the notches 26c, 27c can be reduced. . Thereby, the main core part 31 can be reduced in size by reducing the number of laminated core sheets 26 and 27 of the main core part 31 and suppressing the stacking thickness. Further, by suppressing variations in the thickness of the main core portion 31, the rotor 14 can be opposed to the rotor 14 at a predetermined position, and smooth rotation of the rotor 14 can be obtained.

  (11) Since the teeth constituent portion 43 is formed in an aspect that becomes tapered toward the rotor 14 side, for example, in an inner rotor type motor, a space for the armature winding 22 can be secured radially inside.

  (12) Since the rotor facing portion 44 is formed so that the circumferential width becomes narrower toward the outer side in the axial direction, the leakage magnetic flux can be suppressed, thereby suppressing an increase in torque ripple accompanying an increase in the leakage magnetic flux. it can. Here, for example, in an inner rotor type motor in which the rotor is provided on the inner side of the stator, the rotor facing portion 44 is located on the inner side in the radial direction, so that the rotor facing portion 44 is formed by punching by press molding and then bent approximately 90 degrees. In this case, the portion that becomes the tip (axially outer portion) of the rotor facing portion 44 is located on the radially inner side. For this reason, by setting the circumferential width of the rotor facing portion 44 to be narrower toward the outer side in the axial direction as described above, it is possible to easily punch out a plurality of rotor facing portions 44 provided in the circumferential direction by press molding.

  (13) Since the first and second projecting portions 52 and 53 in the axial direction of the segment conductor 25 are opposed to the rotor facing portion 44 of the magnetic plate 40 in the radial direction, the facing surface of the stator core 21 facing the rotor 14 is the magnetic plate 40. The size of the stator 13 in the axial direction can be suppressed while ensuring high power by securing the rotor facing portion 44. Further, the stator 13 in which the armature winding 22 is configured by the segment conductor 25 can be configured with a high space factor of the armature winding 22. On the other hand, since the segment conductors 25 are arranged in the radial direction in the slot portion S, heat is generated easily in the radial direction. For example, the outer peripheral surface of the stator core 21 is exposed to the outside from between the frames 11 and 12. It is preferable that heat generated in the stator 13 is easily released to the outside.

  (14) Since the outer peripheral surface of the stator core is exposed when the stator core 21 is clamped in the axial direction by the frames 11 and 12, the heat of the stator core 21 (stator 13) can be easily released to the outside.

  (15) Since the plate thickness T1 of the magnetic plate 40 can be made thicker than the plate thickness T2 of each of the annular core sheets 26 and 27, the magnetism can be easily taken in via the magnetic plate 40, which can contribute to high output.

In addition, you may change each said embodiment as follows.
-In above-mentioned embodiment, although the auxiliary core part 50 was made into the annular | circular shape, it is not restricted to this. For example, you may comprise in C shape which has a communication part in which a part communicates in radial direction. However, it is preferable that the communicating portion of the auxiliary core portion 50 does not overlap the first and second cutout portions 26c and 27c in the axial direction.

  -Although not mentioned in particular in the said embodiment, when making auxiliary | assistant core part 50 into an annular | circular shape by bending from an elongate member, each edge part engages with the both ends of an elongate member. A configuration may be adopted in which an engaging portion is formed and each engaging portion engages in the circumferential direction after bending to form an annular shape.

In the above embodiment, a cold-rolled steel plate (SPCC) is used as the material of the auxiliary core portion 50 of the stator core 21, but it may be changed as appropriate as long as it is a magnetic material.
In the above embodiment, the auxiliary core part 50 is formed by bending an elongated member into an annular shape. However, the present invention is not limited to this, and the annular auxiliary core part 50 is formed in advance by press punching or the like. Also good.

  In the above embodiment, the first cutout portion 26 c is formed in the first annular core sheet 26 and the second cutout portion 27 c is formed in the second annular core sheet 27, but this is not restrictive. For example, only the first notch 26c is formed in the first and second annular core sheets 26, 27, or only the second notch 27c is formed in the first and second annular core sheets 26, 27. May be. Moreover, you may comprise using 3 or more types of core sheets instead of the structure using two types of core sheets, the 1st cyclic | annular core sheet 26 and the 2nd cyclic | annular core sheet 27. FIG. Moreover, you may employ | adopt the following structures.

(Configuration A)
As shown in FIG. 14, the stator 13 has a stator core 71 having twelve teeth 71a and an armature winding 72 wound around the teeth 71a. The armature winding 72 is configured by winding, for example, a copper wire in a concentrated winding around each of the teeth 71a.

As shown in FIG. 15, the stator core 71 is configured by alternately stacking first annular core sheets 73 and second annular core sheets 74 in the axial direction.
The first and second annular core sheets 73 and 74 have annular plate-like annular yokes 73a and 74a and twelve teeth constituent portions 73b and 74b connected to the annular yokes 73a and 74a, respectively. In addition, the teeth 71a of the stator 13 are configured by laminating the tooth components 73b and 74b.

  In the first annular core sheet 73, a notch 73c and a through-hole 73d are formed between the tooth constituent portions 73b of the annular yoke 73a. The notch 73c is formed by being notched longer than half of the radial length of the annular yoke 73a on the radially inner side of the annular yoke 73a.

The through hole 73d is formed so as to penetrate in a direction orthogonal to the plate surface of the annular yoke 73a. Further, the through hole 73d is formed at substantially the center in the radial direction of the annular yoke 73a.
In the second annular core sheet 74, a notch 74c and a through hole 74d are formed between the tooth constituent portions 74b of the annular yoke 74a. The cutout portion 74c is formed by being cut out longer than half the radial length of the annular yoke 26a on the radially inner side of the annular yoke 74a.

  As shown in FIGS. 15 and 16, the notch 74 c formed in the annular yoke 74 a of the second annular core sheet 74 is formed when the first annular core sheet 73 and the second annular core sheet 74 are laminated. The first annular core sheet 73 is formed at a position partially overlapping with the through hole 73d formed in the annular yoke 73a.

  As shown in FIG. 15, the through hole 74d is formed to penetrate in a direction perpendicular to the plate surface of the annular yoke 74a. Further, the through hole 74d is formed at substantially the center in the radial direction of the annular yoke 74a.

  As shown in FIGS. 15 and 16, the through hole 74 d formed in the annular yoke 74 a of the second annular core sheet 74 is formed when the first annular core sheet 73 and the second annular core sheet 74 are laminated. The first annular core sheet 73 is formed at a position that partially overlaps the notch 73 c formed in the annular yoke 73 a of the first annular core sheet 73. In addition, the first and second annular core sheets 73 and 74 are laminated so that the tooth constituent portions 73b and 74b overlap, so that a part of the through hole 73d and a part of the notch 74c overlap, A part of the notch 73c and a part of the through hole 74d overlap in the axial direction (stacking direction).

  At this time, by laminating the tooth constituent portions 73b, 74b of the annular core sheets 73, 74 so as to overlap each other in the axial direction, a notch portion 73c formed between the tooth constituent portions 73b adjacent in the circumferential direction, The through holes 74d formed between the teeth constituent portions 74b adjacent in the circumferential direction partially overlap in the axial direction. For this reason, the bulge of the axial direction (lamination direction) produced by the bending process at the starting point X3 in the vicinity of the notch 73c can be accommodated in the through hole 74d. Moreover, the through-hole 73d formed between the tooth | gear structure parts 73b adjacent to the circumferential direction and the notch part 74c formed between the tooth | gear structure parts 74b adjacent to the circumferential direction partially overlap in an axial direction. . Further, the bulge in the axial direction (stacking direction) generated at the starting point X4 in the vicinity of the notch 74c by bending can be accommodated in the through hole 73d.

(Configuration B)
As shown in FIG. 17, the stator 13 includes a stator core 81 having 12 teeth 81a and an armature winding 82 wound around the teeth 81a. The armature winding 82 is configured by winding, for example, a copper wire in a concentrated winding around each of the teeth 81a.

As shown in FIG. 18, the stator core 81 is configured by alternately laminating first annular core sheets 83 and second annular core sheets 84 in the axial direction.
As shown in FIG. 18 and FIG. 19, the first and second annular core sheets 83 and 84 are each formed of an annular plate-like annular yoke 83a and 84a and twelve teeth constituent portions 83b connected to the annular yokes 83a and 84a, respectively. 84b. In addition, the teeth 81a of the stator 13 are configured by laminating teeth constituent portions 83b and 84b.

  The first annular core sheet 83 includes a first inner notch portion 83c that is opened radially inward and a first outer notch portion 83d that is opened radially outwardly between the tooth constituent portions 83b of the annular yoke 83a. And are formed.

The first inner notch 83c is formed by being notched shorter than half of the radial length of the annular yoke 83a on the radially inner side of the annular yoke 83a.
The first outer notch 83d is formed by being cut out longer than half of the radial length of the annular yoke 83a on the radially outer side of the annular yoke 83a.

  The second annular core sheet 84 includes a second inner notch 84c that opens radially inward and a second outer notch 84d that opens radially outward between the teeth constituent portions 84b of the annular yoke 84a. And are formed.

  As shown in FIG. 19, the second inner notch 84c is formed by being notched shorter than half the radial length of the annular yoke 83a on the radially inner side of the annular yoke 84a. When the first annular core sheet 83 and the second annular core sheet 84 are laminated, the second inner notch portion 84c overlaps with the connecting portion 83e positioned radially inward from the first outer notch portion 83d. In addition, the first outer notch 83d is formed at a position that does not overlap in the axial direction.

  The second outer notch 84d is formed by being cut out longer than half of the radial length of the annular yoke 84a on the radially outer side of the annular yoke 84a. The second outer notch 84d is formed at a position that does not overlap with the first inner notch 83c in the axial direction. A connecting portion 84e is formed on the radially inner side of the second outer notch portion 84d. The connecting portion 84e is formed so as to overlap the first inner notch portion 83c in the axial direction when the first annular core sheet 83 and the second annular core sheet 84 are laminated. At this time, the first inner notch portion formed between the tooth constituent portions 83b adjacent in the circumferential direction by stacking the tooth constituent portions 83b and 84b of the annular core sheets 83 and 84 so as to overlap each other in the axial direction. 83c and the connection part 84e formed between the tooth | gear structure parts 84b adjacent to the circumferential direction will overlap in an axial direction. For this reason, the bulge of the axial direction (lamination direction) which arises in the connection part 84e by a bending process can be accommodated in the 1st inner side notch part 83c. Further, the connecting portion 83e formed between the tooth constituent portions 83b adjacent in the circumferential direction and the second inner notch portion 84c formed between the tooth constituent portions 84b adjacent in the circumferential direction overlap in the axial direction. Become. For this reason, the bulge of the axial direction (lamination direction) which arises in the connection part 83e by a bending process can be accommodated in the 2nd inner side notch part 84c.

  In the above embodiment, the rotor facing portion 44 is formed in a trapezoidal shape (a shape in which the circumferential width becomes narrower toward the outside in the axial direction) when viewed in the radial direction, but other than this, for example, a parallelogram shape or a rectangular shape when viewed in the radial direction You may form in.

  In the above embodiment, the magnetic plates 40 are provided on both sides of the main core portion 31 in the axial direction. However, the present invention is not particularly limited thereto, and the magnetic plates 40 are provided only on one side of the main core portion 31 in the axial direction. May be. In this case, the sum of the axial length of the main core portion 31 and the axial length of the magnetic plate 40 provided only on one axial side of the main core portion 31 is the axis on the inner peripheral surface of the rotor 14. It is preferable that the length is approximately the same as the direction length.

  Moreover, as shown in FIG. 13, you may employ | adopt the structure which abbreviate | omitted the magnetic board 40. FIG. In this case, the auxiliary core portion 50 is provided on at least one of the main core portions 31 in the axial direction. Further, the main core portion 31 is preferably configured such that its axial length is substantially the same as the axial length of the inner circumferential surface of the rotor 14.

  In the above embodiment, the configuration includes one auxiliary core portion 50. However, as illustrated in FIG. 13, a configuration in which a plurality of auxiliary core portions 50 are stacked may be employed. Thus, it becomes easy to change the thickness (length in the stacking direction) of the auxiliary core unit 50 only by changing the number of stacked layers of the auxiliary core unit 50.

  In the above embodiment, the stator holding portions 11b and 12b of the frames 11 and 12 are sandwiched in the axial direction via the auxiliary core portion 50 provided on the outer side in the axial direction than the magnetic plate 40, and the main core portion 31 and the magnetic plate Although it is configured not to contact the shaft 40 in the axial direction, it is not particularly limited thereto. For example, as shown in FIG. 20, the main core portion 31 may be sandwiched in the axial direction via the annular yoke 42 (laminated portion 41) of the magnetic plate 40. According to the configuration shown in FIG. 20, the annular yoke 42 of the magnetic plate 40 can provide the same effect as that of the auxiliary core unit 50 of the above embodiment, and the increase in the number of parts can be suppressed. Moreover, since it is not necessary to make the lamination | stacking part 41 of the magnetic plate 40 small to radial direction so that it may not interfere with an axial direction with respect to the stator holding parts 11b and 12b, the fall of an output can be suppressed. Further, when the plate thickness T1 of the magnetic plate 40 is made thicker than the plate thickness T2 of each of the annular core sheets 26 and 27 to improve the output, each of the annular core sheets 26 and 27 that are thinner than the magnetic plate 40. By adjusting the number of sheets, it is possible to suppress fluctuations in the axial dimension of the entire motor 10.

  In the above embodiment, each segment conductor 25 is formed so as to be folded back on the first projecting portion 52 side connecting the pair of linear portions 51 inserted through the slot portion S, and welded or the like on the second projecting portion 53 side. Although it was comprised so that it may join, it is not specifically limited to this. For example, as shown in FIG. 21, the pair of linear portions 51 may be separated from each other, and the first projecting portion 52 may be joined by welding or the like. Further, the connection between the segment conductors 25 may be a connection structure using another member such as a bus bar in addition to welding.

In the above embodiment, the magnetic plate 40 is caulked and fixed to the main core portion 31 (the respective annular core sheets 26 and 27), but may be fixed by, for example, adhesion or welding.
-In above-mentioned embodiment, although the auxiliary core part 50 was fixed to the main core part 31 by welding, it is not restricted to this. For example, caulking and fixing may be employed as a fixing method between the auxiliary core portion 50 and the main core portion 31 as in the main core portion 31 and the magnetic plate 40. Moreover, you may employ | adopt the method of fixing with an adhesive agent as a fixing method of the auxiliary | assistant core part 50 and the main core part 31. FIG. Further, as a method of fixing the auxiliary core portion 50 and the main core portion 31, when the auxiliary core portion 50 is made of, for example, a magnetic resin, a method of integrally forming the main core portion 31 by two-color molding is adopted. Also good. Further, as a method of fixing the auxiliary core part 50 and the main core part 31, a method of fastening (fixing) with a fastening member such as a through bolt may be adopted.

  In the above embodiment, the plate thickness T1 of the magnetic plate 40 is set to be thicker than the plate thickness T2 of each of the annular core sheets 26 and 27. However, the present invention is not particularly limited thereto, and the plate thickness T1 of the magnetic plate 40 is The annular core sheets 26 and 27 may be set to be equal to or thinner than the plate thickness T2.

In the above embodiment, the armature winding 22 configured by the segment conductor 25 is used. However, for example, an armature winding formed by winding a copper wire or the like around a tooth may be used.
In the above embodiment, the laminated portion 41 of the magnetic plate 40 is an annular plate shape, but a notch may be formed in the annular yoke 42 of the laminated portion 41. Further, by forming a notch in the annular yoke 42 that is the yoke portion of the laminated portion 41, the laminated portion 41 is bent in the same manner as the annular core sheets 26 and 27 of the main core portion 31 to form an annular shape. Becomes easy.

  In the above embodiment, the belt-shaped core sheets 28 and 29 punched from the steel plate are annularly bent into one annular core sheet 26 and 27, and the stator core 21 is formed by laminating a plurality of annular core sheets 26 and 27. Not limited to this. For example, the stator core 21 may be formed by laminating a plurality of the belt-like core sheets 28 and 29 and bending the laminated belt-like core sheets 28 and 29 in an annular shape.

  In addition, the strip-shaped core sheets 28 and 29 are punched from the strip-shaped steel sheet 30 so as to correspond to the single annular core sheets 26 and 27. However, the present invention is not limited to this, and the strip-shaped core sheet punched from the strip-shaped steel sheet 30 is bent. You may employ | adopt the structure laminated | stacked spirally.

  In the above embodiment, the cold-rolled steel plate (SPCC) is used as the material of the annular core sheets 26 and 27 (main core portion 31) of the stator core 21, but other materials may be used.

  In the above embodiment, the first annular core sheet 26 and the second annular core sheet 27 are alternately stacked one by one, but the present invention is not limited to this. For example, a configuration in which a plurality of first annular core sheets 26 and second annular core sheets 27 are alternately stacked may be employed.

In the above embodiment, the ferrite magnet is used as the field magnet 62 of the rotor 14, but other magnets such as a neodymium magnet may be used.
In the above embodiment, the rotor 14 is embodied as the inner rotor type motor 10 arranged on the inner peripheral side of the stator 13, but is not particularly limited to this, and the outer rotor type in which the rotor is arranged on the outer peripheral side of the stator It may be embodied in the motor.

  -Each above-mentioned embodiment and each above-mentioned modification may be combined suitably.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 13 ... Stator, 14 ... Rotor, 21 ... Stator core, 22 ... Armature winding, 26 ... First annular core sheet (core sheet), 26a ... Teeth component, 26b ... Teeth component, 26c ... No. 1 notch (notch), 27 ... second annular core sheet (core sheet), 27a ... teeth constituent, 27b ... teeth constituent, 27c ... second notch (notch), 28b ... teeth Constituent part, 29b ... Teeth constituent part, 31 ... Main core part, 40 ... Magnetic plate (auxiliary core part), 41 ... Laminated part, 42 ... Ring yoke (auxiliary core part), 43 ... Teeth constituent part, 44 ... Opposite rotor 50, auxiliary core portion, 71 ... stator core, 72 ... armature winding, 73b ... teeth constituent portion, 73c ... notch portion, 73d ... through hole (notch portion), 74b ... teeth structure , 74c ... notch, 74d ... through hole (notch), 81 ... stator core, 82 ... armature winding, 83b ... teeth component, 83c ... first inner notch (notch), 83d ... 1st outer notch part (notch part), 84b ... Teeth constituent part, 84c ... 2nd inner notch part (notch part), 84d ... 2nd outer notch part (notch part).

Claims (6)

A stator core configured by laminating a plurality of core sheets in which a plurality of teeth constituent portions are connected by a yoke,
In the yoke, a plurality of notches are formed between the teeth constituting portions so as to open to the inside or outside in the radial direction of the yoke,
A stator core, wherein an auxiliary core portion is laminated and disposed so as to straddle the notch portion in the circumferential direction. The stator core according to claim 1, wherein
The auxiliary core portion is formed in an annular shape. The stator core according to claim 1 or 2,
A stator core, wherein a plurality of the auxiliary core portions are laminated. In the stator core according to claim 3, which refers to claim 2 or claim 2,
The auxiliary core portion is configured by forming a long member into an annular shape.   The stator provided with the stator core as described in any one of Claims 1-4, and the armature winding with which this stator core is mounted | worn.   A motor comprising: the stator according to claim 5; and a rotor facing the stator core in a radial direction.