JP6030461B2 - motor - Google Patents

Description

  The present invention relates to a motor.

  Conventionally, for example, as shown in Patent Document 1, there is a motor including a pair of frames that are assembled on both sides in the axial direction of the stator and sandwich the stator in the axial direction. In the stator, armature windings are mounted on a plurality of teeth extending radially inward from the main outer peripheral portion of the stator core, and the stator core is composed of a plurality of core sheets stacked in the axial direction and fixed to each other by caulking. The frames are connected to each other by a connecting member such as a through bolt, for example, with the main outer peripheral portion of the stator core sandwiched in the axial direction. Further, the rotor disposed on the inner peripheral side of the stator is rotatably supported by bearings assembled to the respective frames. In the motor having such a configuration, the main outer peripheral portion of the stator core can be exposed to the outside from between the frames, so that the heat of the stator is easily released to the outside.

JP 2011-239533 A

  However, in the motor as described above, since each core sheet constituting the stator core is formed relatively thin, it is easily deformed by the sandwiching load from each frame, and the deformation increases the magnetic resistance of the main outer peripheral portion of the stator core. As a result, the motor output may be reduced.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor that can suppress the influence of the sandwiching load received from each frame on the magnetic flow of the stator core. .

A motor for solving the above problems includes a stator in which armature windings are attached to a plurality of teeth extending radially inward from a main outer peripheral portion of a stator core made of a plurality of core sheets stacked in an axial direction, and a shaft of the stator core A first frame and a second frame that are respectively provided on both sides in the direction and sandwich the stator core in the axial direction; and a rotor rotatably supported by the first and second frames and disposed on an inner peripheral side of the stator; The stator core is exposed to the outside from between the first frame and the second frame, and the stator core is adjacent to the core in the axial direction. Sheets are fixed by caulking, and the stator core is formed with a sandwiched portion protruding radially outward from the main outer peripheral portion, and The second frame, at least the said stator core and clamp the clamped portion in the axial direction, said first and while applying axial clamping load to the first and second frame in the outer peripheral side of said stator A connecting member for connecting two frames, each frame receiving an axial clamping load applied from the connecting member, an axially extending from the connecting and fixing portion, and the covering of the stator core. A clamping part and an abutting part that abuts in the axial direction, and the clamped part is clamped in the axial direction by the abutting part of each of the frames; Engagement recesses that engage in the circumferential direction are provided .

  According to this configuration, the sandwiched portion of the stator core is formed so as to protrude radially outward from the main outer peripheral portion, and thus can be configured as a portion with less magnetic flow than the main outer peripheral portion. And since this to-be-clamped part is clamped by each flame | frame, the influence which the clamping load of each flame | frame has on the magnetic flow of a stator core can be restrained few.

In addition, since the main outer peripheral portion of the stator core is exposed to the outside from between the frames, the heat of the stator is well radiated, and the exposed portion of the main outer peripheral portion is sandwiched to protrude radially outward Since the portion is formed, the heat dissipation area (exposed area) of the stator core can be increased, and the heat dissipation can be further improved.
Further, it can be configured such that the abutting portion of the frame abuts with the sandwiched portion of the stator core on a straight line on which the sandwiching load of the connecting member acts. For this reason, the couple based on the clamping load is not generated in the frame, and as a result, the deformation of the frame can be more reliably suppressed.
In addition, since the sandwiched portion of the stator core is engaged in the circumferential direction with respect to the connecting members that connect the frames, it is possible to prevent the stator core from slipping.

  In the motor, the stator core includes a main core portion in which a plurality of core sheets are laminated in the axial direction, and a magnetic plate provided at an end portion in the axial direction of the main core portion. The laminated portion laminated on the core sheet at the axial end portion of the main core portion, and the rotor facing the rotor extending radially outward from the rotor-side end portion of the laminated portion and facing the rotor in the radial direction It is preferable to have a part.

  According to this configuration, since the rotor facing portion of the magnetic plate extends outward in the axial direction (on the side opposite to the main core portion), the axial length of the main core portion is reduced without reducing the facing surface of the stator core facing the rotor. This can contribute to the miniaturization of the motor in the axial direction.

In the motor, it is preferable that the laminated portion of the magnetic plate is caulked and fixed to the core sheet at an axial end portion of the main core portion.
According to this configuration, the magnetic plate can be easily fixed to the core sheet.

  In the motor, it is preferable that a caulking fixing portion between the magnetic plate and the core sheet is formed at a radially inner position of the sandwiched portion in a portion constituting a main outer peripheral portion of the stator core.

  According to this configuration, since the caulking fixing portion of the magnetic plate is formed in the main outer peripheral portion where the radial width is widened by forming the sandwiched portion, the caulking fixing portion is the main outer peripheral portion. The influence on the magnetic flow can be suppressed.

  In the motor, it is preferable that the caulking fixing portion between the magnetic plate and the core sheet and the caulking fixing portion between the core sheets are both formed by dowel caulking, and their dowel diameters are set to be different from each other. .

  According to this structure, it can set to the dowel diameter according to the thickness of a core sheet and a magnetic board, the formation location of a crimping | fixing fixing part, etc. For example, if the thickness of the magnetic plate is greater than the thickness of the core sheet, the dowel diameter of the caulking fixing portion between the magnetic plate and the core sheet is set to be larger, thereby securing the caulking strength. It is possible to suppress an increase in magnetic resistance at the fixed portion.

In the motor, it is preferable that the caulking fixing portion between the core sheets is formed at a position on the inner diameter side with respect to a portion sandwiched between the frames in the main outer peripheral portion.
According to this configuration, since the caulking fixing portion between the core sheets is formed at a position deviated from the portion clamped by each frame, it is possible to suppress an increase in magnetic resistance due to the caulking fixing portion receiving the clamping load. it can.

In the motor, the plurality of core sheets constituting the stator core are preferably laminated in the axial direction while being rotated in the circumferential direction.
According to this configuration, the stator core has a structure in which the core sheets are rotationally laminated, so that deviation in dimensional accuracy of each core sheet is suppressed. Can be reduced.

  In the motor, the number of teeth of the stator core is set to 60, and a plurality of the sandwiched portions are provided at intervals of 90 degrees, 120 degrees, and 180 degrees in the circumferential direction. Is preferred.

According to this configuration, the core sheet can be suitably rotated and laminated .

In the motor, it is preferable that each frame sandwiches only the sandwiched portion of the stator core.
According to this structure, since each frame clamps only the sandwiched portion of the stator core, generation of couples in the frame can be more suitably suppressed.

  In the motor, the armature winding is inserted into a slot formed between the teeth of the stator core, and a plurality of segments in which projecting portions projecting in the axial direction from the slot are electrically connected to each other It is preferable to consist of a conductor.

  According to this configuration, the stator in which the armature winding is composed of segment conductors can be configured to have a high space factor of the armature winding, but also easily generate heat. By adopting a segment conductor in an excellent configuration, a more preferable configuration can be obtained.

  According to the motor of the present invention, it is possible to suppress the influence on the magnetic flow of the stator core due to the clamping load received from each frame.

It is a schematic cross section of the motor of the embodiment. It is a top view of the stator of the same form. It is a front view for demonstrating the rotor opposing part of the magnetic plate of the same form. It is a disassembled perspective view of the stator core of the same form. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. FIG. 6 is a sectional view taken along line 6-6 in FIG. It is a top view which expands and shows the motor 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 of the motor of the same form. It is a top view 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. 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 are formed on the main body portions 11a and 12a of the frames 11 and 12 and extend radially outward from a plurality of locations (for example, two locations) on their outer peripheral edges. In the present embodiment, two fastening fixing portions 11c and 12c are provided at positions facing each other by 180 degrees in the circumferential direction. 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. Further, the fastening and fixing portions 11c and 12c are located on the outer side in the axial direction (on the opposite side of the stator) of the stator holding portions 11b and 12b, respectively.

[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 7, the stator core 21 includes a cylindrical portion 23 (main outer peripheral portion) constituting the outer periphery thereof, and a plurality (60 in the present embodiment) extending radially inward from the cylindrical portion 23. ) Teeth 24 and a core outer peripheral protruding portion 26 (a sandwiched portion) that protrudes radially outward from the outer peripheral surface of the cylindrical portion 23 is formed.

  Four core outer peripheral protruding portions 26 are formed at equal intervals in the circumferential direction of the cylindrical portion 23 (at intervals of 90 degrees). Moreover, the core outer periphery protrusion part 26 is formed along the axial direction from the axial direction one end of the cylindrical part 23 to the other end. An engagement groove 26a (engagement recess) that is recessed in an arc shape is formed in the center in the circumferential direction of the outer end face of the core outer periphery protrusion 26 along the axial direction.

  Two of the core outer circumferential protrusions 26 that are 180 degrees opposite to each other are at the same position in the circumferential direction with respect to the through bolt 15. The through bolts 15 are fitted in the engaging grooves 26 a formed in the core outer periphery protruding portion 26, and the engaging grooves 26 a are engaged with the through bolts 15 in the circumferential direction. This engagement prevents the stator core 21 from slipping by any chance.

  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 of the rotary 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 S that is a part that accommodates the segment conductor 25 that constitutes the armature winding 22. That is, the slot S is configured by the circumferential side surface of the tooth 24 and the inner circumferential surface of the cylindrical portion 23 between the teeth 24. In the present embodiment, 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, so that each slot S has a substantially rectangular shape when viewed in the axial direction. It is configured. Each slot S has a shape that penetrates the stator core 21 along the axial direction and opens radially inward. The number of slots 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 portion formed by laminating a plurality of core sheets 30 formed by stamping a steel plate by press working and then caulking them together to integrate them. 31 and a magnetic plate 40 (auxiliary core portion) fixed to both ends of the main core portion 31 in the axial direction. In the present embodiment, one magnetic plate 40 having the same shape is provided on each side of the main core portion 31 in the axial direction.

  Each core sheet 30 of the main core portion 31 has the same shape and is disposed so that the plate surface is orthogonal to the axial direction. Each core sheet 30 includes an annular portion 32 having an annular shape, a plurality of teeth constituent portions 33 extending radially inward from the annular portion 32, and a plurality of protruding portions 34 protruding radially outward from the annular portion 32. have. Moreover, each core sheet 30 is laminated | stacked so that the teeth structure part 33 and the protrusion part 34 may overlap along an axial direction.

  As shown in FIGS. 2, 4, and 7, the magnetic plate 40 is formed by pressing, and a plate-like laminated portion 41 laminated on the core sheet 30 at both axial ends of the main core portion 31. have. The laminated portion 41 is laminated so as to be parallel and coaxial with the core sheet 30 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 the core sheet 30 of the main core portion 31 (see FIG. 9).

  The laminated portion 41 includes an annular portion 42 that forms an annular shape that overlaps the annular portion 32 of the core sheet 30 in the axial direction, a plurality of teeth constituent portions 43 that extend radially inward from the annular portion 42, and a diameter from the annular portion 42. A plurality of projecting portions 45 projecting outward in the direction are formed. The annular part 42, the tooth constituent part 43 and the protruding part 45 of the laminated part 41 have the same shape as the annular part 32, the tooth constituent part 33 and the protruding part 34 of the core sheet 30 in the axial direction view. The magnetic plate 40 is provided so that the annular portion 42, the tooth constituent portion 43, and the protruding portion 45 of the laminated portion 41 overlap the annular portion 32, the tooth constituent portion 33, and the protruding portion 34 of the core sheet 30, respectively. It has been.

  The annular portions 32 and 42 of the core sheet 30 and the magnetic plate 40 constitute the cylindrical portion 23 of the stator core 21, the teeth constituting portions 33 and 43 constitute the teeth 24 of the stator core 21, and the projecting portions 34 and 45. The core outer periphery protrusion part 26 is comprised. The shapes of the annular portions 32, 42, the teeth constituent portions 33, 43, and the protrusions 34, 45 in the axial direction are the same as the shapes of the cylindrical portion 23, the teeth 24, and the core outer peripheral protrusion 26, respectively. Therefore, detailed description is omitted.

  A rotor facing portion 44 extending outward in the axial direction (on the side opposite to the main core portion) is formed on the radially inner end portion (rotor 14 side end portion) of the teeth constituting portion 43 of the magnetic plate 40. The rotor facing portion 44 is formed by bending the radially inner end portion of the tooth constituting portion 43 at a right angle 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 (core sheet 30). 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 FIG. 3, the rotor facing portion 44 has side edge portions 44a as circumferential side portions on both sides in the circumferential direction. The side edge portion 44 a is shaped to be inclined in the circumferential direction with respect to the axial direction of the rotating shaft 18. The side edge portion 44a is inclined so as to be closer to the center side in the circumferential direction of the rotor facing portion 44 toward the tip side (on the side opposite to the main core portion). Further, each side edge portion 44 a is formed so as to be bilaterally symmetric with respect to the center line in the circumferential direction of the rotor facing portion 44 when the rotor facing portion 44 is viewed from the radial direction. For this reason, the rotor facing portion 44 is formed such that the circumferential width on the axial base end side (axial inner side) is equal to the circumferential width of the distal end portion (wide portion 24b) of the tooth constituent portion 43, and the axial distal end. The circumferential width is narrower toward the side (outer in the axial direction), and is formed to have a trapezoidal shape when viewed in the radial direction. In addition, each rotor opposing part 44 of this embodiment is formed so that all may make the same shape.

  The annular portion 32 of each core sheet 30 is fixed by dowel crimping between adjacent ones in the axial direction. The annular portion 42 of the laminated portion 41 of the magnetic plate 40 is fixed to the annular portions 32 of the core sheet 30 at both axial ends by dowel crimping.

  As shown in FIGS. 2, 4, and 5, the annular portion 32 of each core sheet 30 has a convex portion 32 a (a dowel) protruding in the plate thickness direction except for one end in the axial direction (core sheet 30 a). Is formed by press working. Twelve convex portions 32a are formed at equal intervals in the circumferential direction (30 degree intervals) of the annular portion 32, and concave portions 32b formed when the convex portions 32a are formed are formed on the back side of the respective convex portions 32a. In the present embodiment, the convex portion 32a and the concave portion 32b are positions shifted in the circumferential direction with respect to the protruding portion 34, and are in a predetermined slot S (specifically, every fifth slot S in the circumferential direction). It is formed at a radially outer position. Each convex portion 32a is press-fitted and fixed (doweled) in the concave portion 32b of the core sheet 30 adjacent in the axial direction. The core sheet 30a at one end in the axial direction is formed with a plurality of through holes 30c into which the convex portions 32a of the adjacent core sheets 30 are press-fitted and fixed. Thus, the convex part 32a and the recessed part 32b (through-hole 30c) comprise the caulking fixing part of each core sheet 30, and each core sheet 30 is fixed integrally by the caulking fixing part, and the main core part 31 Is configured.

  As shown in FIGS. 2, 4, and 6, the annular portion 42 (laminated portion 41) of each magnetic plate 40 has a convex portion 42 a that protrudes toward the main core portion 31 side (core sheet 30 side) in the plate thickness direction. (Dowel) is formed by press working, and a concave portion 42b formed at the time of forming the convex portion 42a is formed on the opposite surface. The convex portion 42 a is formed at a radially inner position of each protruding portion 45 in the annular portion 42. In the present embodiment, two protrusions 42a are provided corresponding to one protrusion 45, and a total of eight protrusions 42a are formed. Moreover, the convex part 42a is each formed in the position which shifted | deviated to the circumferential direction both sides with respect to the engaging groove 26a in the position inside radial direction of each protrusion part 45. As shown in FIG. That is, the convex portion 42a is formed at a position where the radial width of the protruding portion 45 is wide, and an increase in magnetic resistance due to the provision of the convex portion 42a is suppressed. The dimension from the axial center of the stator core 21 to the center of the convex part 42a is set larger than the dimension from the axial center of the stator core 21 to the center of the convex part 32a.

  On the other hand, through holes 30d penetrating in the plate thickness direction are formed at positions corresponding to the convex portions 42a in the core sheet 30 (core sheet 30a) adjacent to the laminated portion 41 of the magnetic plate 40 in the axial direction. And each convex part 42a of the magnetic board 40 is press-fitted and fixed (dowel caulking) to each through-hole 30d of the core sheet 30a. Thereby, the annular portion 42 of the magnetic plate 40 is fixed to the annular portion 32 of the core sheet 30 a, and the magnetic plate 40 is configured integrally on both axial sides of the main core portion 31.

  In the present embodiment, the through hole 30d in which the convex portion 42a of the magnetic plate 40 is caulked is formed only in the core sheet 30 adjacent to the magnetic plate 40, but not limited thereto, for example, the magnetic plate 40 and 30 d of through-holes may be formed ranging from the adjacent core sheet 30 to several (for example, 2 to 3) core sheets 30. Further, the through holes 30d may be formed in all the core sheets 30.

  In addition, the outer diameters (the dowel diameters) of the convex portions 32a and 42a formed by press working are set to a size suitable for the thickness of the steel sheet to be processed, so that the protrusion amount of the convex portions 32a and 42a is suitably set. It can be secured. That is, in this embodiment, since the plate thickness T1 of the magnetic plate 40 is thicker than the plate thickness T2 of the core sheet 30, the dowel diameter of the convex portion 42a between the magnetic plate 40 and the core sheet 30a is between the core sheets 30. It is set larger than the dowel diameter of the convex portion 32a. Thereby, the protrusion amount of convex part 32a, 42a is made into an appropriate magnitude | size, As a result, the crimping intensity | strength is ensured suitably. In addition, since the convex portions 32a and 42a have a larger influence on the magnetic flow as the dowel diameter is larger (that is, a larger magnetic resistance), it is desirable to set the minimum dowel diameter that can secure the caulking strength. .

  The main core part 31 of this embodiment is laminated | stacked, rotating each core sheet 30 punched from the steel plate with the same punching die which is not shown in figure by the predetermined angle (90 degree | times) to the circumferential direction. Thereby, the deterioration of the cogging torque characteristic due to the accuracy of each core sheet 30 of the stator core 21 (particularly, the accuracy of the circumferential width for each of the tooth constituent portions 33) can be offset and satisfactorily mitigated. That is, if the core sheets 30 are laminated without rotating, the cogging torque characteristics may be deteriorated due to the variation in shape of each of the core constituent portions 33 of the core sheets 30, but the cogging torque characteristics of the core sheets 30 may be reduced. By shifting in the circumferential direction, a large portion of the cogging torque amplitude is canceled to improve the overall cogging torque characteristics.

  In addition, the formation position of the core outer periphery protrusion part 26 of the stator core 21 is set according to the number of teeth 24 (angle between the teeth 24) so that rotation lamination | stacking of each core sheet | seat 30 is attained. That is, in this embodiment, since the number of teeth 24 is 60, the interval is set to 90 degrees which is a multiple of 6 degrees of the circumferential interval of the teeth 24.

  Moreover, in this embodiment, since the protrusion part 34 (protrusion part 45 of the magnetic board 40) of the core sheet 30 is formed at intervals of 90 degrees in the circumferential direction, the protrusion part 34 ( By punching and setting so that the protrusions 45) are positioned, the core sheet 30 (magnetic plate 40) can be formed from a steel plate having a smaller area, which can contribute to an improvement in yield.

  As shown in FIGS. 5 and 7, a sheet-like insulating member 47 made of an insulating resin material is mounted in each slot 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 S, and is formed along the inner peripheral surface of the slot S. Each insulating member 47 is inserted into the slot S in the axial direction, and the axial length of the insulating member 47 is set slightly longer than the axial length of the slot 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 S.

[Armature winding]
As shown in FIGS. 7 and 9, 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 (see FIG. 5) that are portions inserted into the slot S, and a first protruding portion 52 that protrudes from the slot S to one axial side (the rear frame 11 side). And a second projecting portion 53 projecting from the slot S to the other side in the axial direction (front frame 12 side), and has a substantially U shape folded back on the first projecting portion 52 side. The first and second projecting portions 52 and 53 are opposed to the rotor facing portions 44 on both sides in the axial direction with a gap therebetween 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 slots S having different circumferential positions. Further, the straight portion 51 is disposed inside the insulating member 47 in the slot S (see FIG. 7). The segment conductor 25 and the stator core 21 are electrically insulated by the insulating member 47.

  The segment conductors 25 are arranged so that four straight portions 51 are arranged in the radial direction in each slot S. 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. 9), and the two linear portions 51. Are used, which are arranged second and third from the inside in the radial direction (segment conductor 25y shown inside in FIG. 9). 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 protrudes toward the front frame 12 through the slot S in the axial direction, and is bent in the circumferential direction to form a second protrusion 53 of another segment conductor 25 or a special portion. The segment conductors are electrically connected to each other by welding, whereby each segment conductor 25 constitutes an armature winding 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 linear portion 51 at both axial ends of the slot S. Here, FIG. 8 shows an enlarged view of the vicinity of the end portion in the axial direction of the slot S where the first protrusion 52 is bent in the circumferential direction. As shown in the drawing, a chamfered portion 43a 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) constituting one end of the slot S in the axial direction. 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 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 (plate thickness of the teeth constituting portion 43) is thicker than the plate thickness T2 of the core sheet 30, the curvature radius Rm of the chamfered portion 43a is set to the plate thickness of the core sheet 30. It can be set larger than T2. 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. 9, 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 (swell) radially outward. Thus, the folded portion 25a is biased radially outward from the radial center of the slot S, and the radial inner end of the first protrusion 52 is positioned radially outward from the radial inner end of the slot S. Configured to do. 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.

  On the other hand, the second projecting portion 53 of the segment conductor 25 is not formed with a folded portion, and the second projecting portions 53 are welded to each other, so that a gap between the second projecting portion 53 and the rotor facing portion 44 is obtained. Can be secured easily. 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.

  As shown in FIGS. 2 and 9, each of the stator holding portions 11 b and 12 b has a fitting portion 71 in which the axial end portion of the stator core 21 is fitted. FIG. 9 shows a cross section of the motor along the radial direction at a portion of the stator core 21 where the core outer peripheral protrusion 26 is not formed. The fitting portion 71 is formed in a cylindrical shape whose inner diameter substantially matches the outer diameter of the cylindrical portion 23 of the stator core 21, and the core outer peripheral protruding portion 26 of the stator core 21 is disposed inside the fitting portion 71. Each of the four receiving recesses 72 is notched. The inner peripheral surface of the fitting portion 71 is in contact with the outer peripheral surface of the cylindrical portion 23 (the portion where the core outer peripheral protruding portion 26 is not formed) in the radial direction. Thereby, the frames 11 and 12 and the stator core 21 are centered, and the stator core 21 is held in the radial direction by the fitting portion 71.

  Moreover, as shown in FIG. 1, the core outer peripheral protrusions 26 of the stator core 21 are fitted in the receiving recesses 72 formed in the fitting portions 71, respectively, and the axial bottom surface 72a of the receiving recess 72 is a core. It is in axial contact with the axial end of the outer peripheral protrusion 26 (specifically, the protrusion 45 of the magnetic plate 40). That is, the housing recess 72 of the stator holding portions 11b and 12b is configured to sandwich the core outer periphery protruding portion 26 from both axial sides. In this state, the frames 11 and 12 are connected and fixed to each other by the through bolts 15, whereby the core outer peripheral protruding portion 26 of the stator core 21 is sandwiched in the axial direction by the housing concave portions 72 of the stator holding portions 11 b and 12 b. In addition, each accommodation recessed part 72 is engaged with the core outer periphery protrusion part 26 in the circumferential direction, and thereby positioning of each frame 11, 12 and the stator core 21 in the circumferential direction is performed. Further, the outer peripheral surface of the cylindrical portion 23 of the stator core 21 is exposed to the outside from the axial gap between the stator holding portions 11b and 12b.

  Each accommodating recess 72 is provided at a position corresponding to the core outer peripheral protruding portion 26, that is, at an interval of 90 degrees in the circumferential direction, and two of the accommodating recesses 72 at positions facing each other at 180 degrees are fastened to the frames 11 and 12. It is formed at a position that overlaps the fixed portions 11c and 12c in the axial direction. The fastening and fixing portions 11c and 12c are portions that receive an axial clamping load from the through bolt 15, and the housing recess 72 is formed at a position extending in the axial direction from the fastening and fixing portions 11c and 12c. The bottom surface 72a of the housing recess 72 is configured to come into contact with the core outer periphery protruding portion 26 on a straight line on which the clamping load of the through bolt 15 acts. That is, the reaction force applied from the core outer peripheral protrusion 26 to the bottom surface 72a of the housing recess 72 and the clamping load received by the fastening and fixing portions 11c and 12c from the through bolt 15 do not become couples. In particular, the deformation of the 12 stator holding portions 11b and 12b and the fastening and fixing portions 11c and 12c is more reliably suppressed.

  Further, the dimension from the axial center of the stator core 21 to the center of the convex part 32a (concave part 32b) is set smaller than the dimension from the axial center of the stator core 21 to the core outer peripheral protruding part 26. That is, the convex portion 32a (concave portion 32b) is formed at a position closer to the inner diameter side than the core outer peripheral protruding portion 26 sandwiched between the frames 11 and 12. As a result, the convex portions 32a and the concave portions 32b that are caulked and fixed are formed at positions deviated from the positions sandwiched by the frames 11 and 12, and the magnetic resistance increases due to the convex portions 32a and the concave portions 32b receiving a sandwich load. Is suppressed.

[Rotor]
As shown in FIG. 1, the rotor 14 is fixed to a rotary shaft 18 supported by bearings 16 and 17, a cylindrical rotor core 61 fixed to the rotary shaft 18 so as to be integrally rotatable, and an outer peripheral surface of the rotor core 61. And a plurality of (10 in this embodiment) field magnets 62. Each field magnet 62 is made of a ferrite magnet, and is arranged such that magnetic poles (N pole and S pole) are alternately different in the circumferential direction. The axial length of the rotor core 61 and the field magnet 62 of the rotor 14 is the axial length of the inner peripheral end of the stator core 21 (that is, from the tip of the rotor facing portion 44 of the one magnetic plate 40 to the other magnetic plate 40). The length of the rotor facing portion 44 to the tip of the rotor facing portion 44). 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.

  A front end portion (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.

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 the present embodiment, since the thickness T1 of the magnetic plate 40 is set to be thicker than the thickness T2 of the core sheet 30, magnetic saturation is unlikely to occur in the magnetic plate 40, and magnetism is generated via the magnetic plate 40. Easy to import.

  Here, 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 axial length of the surface of the stator core 21 facing the rotor 14 (inner peripheral surface of the stator core 21) can be secured to increase the output. In the space on the outer peripheral side of each rotor facing portion 44, the first and second projecting portions 52 and 53 of the segment conductor 25 projecting axially from the slot S are disposed. The projecting portions 52 and 53 are configured to face the rotor facing portions 44 on both sides in the axial direction in the radial direction. For this reason, the axial length of the stator 13 (in this embodiment, the length from the axial end of the first protrusion 52 to the second protrusion 53) while ensuring output by the rotor facing portion 44 of the magnetic plate 40. ) Can be suppressed.

  Moreover, since the stack thickness of the main core portion 31 of the stator core 21 is suppressed while the output is secured by the rotor facing portion 44, the variation (tolerance) of the stack thickness of the main core portion 31 can be suppressed to be small. Thereby, the fluctuation | variation of the space | interval of the axial direction of each flame | frame 11 and 12 which pinches | interposes the main core part 31 is suppressed, and the fluctuation | variation of the axial direction dimension of the motor 10 whole is suppressed by extension. Note that the variation (tolerance) of the magnetic plate 40 increases as the plate thickness T1 increases. However, as in the present embodiment, the frames 11 and 12 sandwich only the main core portion 31 and 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.

  In the present embodiment, the outer peripheral surface of the cylindrical portion 23 of the stator core 21 is exposed to the outside through the gaps in the axial direction of the frames 11 and 12 (stator holding portions 11b and 12b). Excellent heat dissipation. In addition, the segment conductor 25 employed in the armature winding 22 of the present embodiment has the linear portion 51 aligned in the radial direction in each slot S, so that the space factor of the armature winding 22 is increased. On the other hand, it is easy to dissipate heat in the radial direction. For this reason, by adopting the segment conductor 25 in the configuration of the present embodiment that is excellent in heat dissipation from the stator core 21 to the outside in the radial direction, it becomes a preferable configuration in terms of heat dissipation of the stator 13. Furthermore, in this embodiment, since the core outer peripheral protrusion 26 is formed on the outer peripheral surface of the cylindrical portion 23 exposed to the outside from between the axial directions of the stator holding portions 11b and 12b, the heat radiation area of the stator core 21 is increased. The (exposed area on the outer periphery) is configured to be wide, and the heat dissipation is further improved.

  Further, in the configuration in which the segment conductor 25 is used for the armature winding 22, the number of slots 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, characteristic effects of the present embodiment will be described.
(1) The stator core 21 includes a main core portion 31 in which core sheets 30 adjacent in the axial direction are fixed by caulking, and a magnetic plate 40 that is fixed by caulking on both sides in the axial direction of the main core portion 31. The stator core 21 is formed with a core outer periphery protruding portion 26 protruding radially outward from the cylindrical portion 23, and the rear frame 11 and the front frame 12 sandwich the core outer periphery protruding portion 26 of the stator core 21 in the axial direction. Since the core outer peripheral protruding portion 26 of the stator core 21 protrudes radially outward from the cylindrical portion 23, it can be configured as a portion with less magnetic flow than the cylindrical portion 23. And since this core outer periphery protrusion part 26 is clamped by each flame | frame 11 and 12, the influence which the clamping load of each flame | frame 11 and 12 has on the magnetic flow of the stator core 21 can be suppressed little.

  In addition, since the cylindrical portion 23 of the stator core 21 is exposed to the outside from between the frames 11 and 12, the heat of the stator 13 is well radiated, and the exposed portion of the cylindrical portion 23 has a radially outer side. Therefore, the heat radiation area (exposed area) of the stator core 21 can be increased, and the heat radiation performance can be further improved.

  (2) The magnetic plate 40 includes a laminated portion 41 laminated on the core sheet 30 (core sheet 30a) at the axial end portion of the main core portion 31, and an axially outer side from the end portion of the laminated portion 41 on the rotor 14 side. And a rotor facing portion 44 that faces the rotor 14 in the radial direction. According to this configuration, since the rotor facing portion 44 of the magnetic plate 40 extends outward in the axial direction (on the side opposite to the main core portion), the main core portion 31 does not decrease the facing surface of the stator core 21 facing the rotor 14. Thus, the axial length of the motor 10 can be reduced, which can contribute to the downsizing of the motor 10 in the axial direction.

  (3) Since the laminated portion 41 of the magnetic plate 40 is caulked and fixed to the core sheet 30 at the axial end of the main core portion 31, the magnetic plate 40 can be easily fixed to the core sheet 30. Become.

  (4) The caulking fixing portion (the convex portion 42 a and the through hole 30 d) between the magnetic plate 40 and the core sheet 30 is formed at the radially inner position of the core outer peripheral protruding portion 26 in the cylindrical portion 23. According to this structure, since the convex part 42a and the through-hole 30d are formed in the site | part of the cylindrical part 23 where the radial width | variety is widened by forming the core outer periphery protrusion part 26, the convex part 42a and The influence of the through hole 30d on the magnetic flow in the cylindrical portion 23 can be suppressed.

  (5) The caulking fixing part (the convex part 42a and the through hole 30d) between the magnetic plate 40 and the core sheet 30 and the caulking fixing part (the convex part 32a and the concave part 32b (the through hole 30c)) between the core sheets 30 are both together. It consists of dowels and the dowel diameters are set to be different from each other. According to this structure, it can set to the dowel diameter according to the thickness of the core sheet 30 and the magnetic board 40, the formation location of a crimping | fixed part, etc. When the plate thickness T1 of the magnetic plate 40 is thicker than the plate thickness T2 of the core sheet 30 as in the present embodiment, the caulking fixing portion (the convex portion 42a and the through hole 30d) between the magnetic plate 40 and the core sheet 30. It is possible to suppress the increase in the magnetic resistance at the caulking fixing portion while ensuring the caulking strength.

  (6) The caulking fixing part (the convex part 32a and the concave part 32b (through hole 30c)) between the core sheets 30 is formed at a position closer to the inner diameter side than the part sandwiched between the frames 11 and 12 in the cylindrical part 23. The According to this configuration, since the caulking fixing portion between the core sheets 30 is formed at a position deviated from the portion clamped by the frames 11 and 12, the increase in magnetic resistance due to the caulking fixing portion receiving the clamping load. Can be suppressed.

  (7) The plurality of core sheets 30 constituting the stator core 21 are laminated in the axial direction while being rotated in the circumferential direction. That is, since the stator core 21 has a structure in which the core sheets 30 are rotationally laminated, the deviation in dimensional accuracy of each core sheet 30 is suppressed, and as a result, cogging regarding the number of slots of the stator 13 and the number of poles of the rotor 14 is achieved. Torque can be reduced.

  (8) The number of teeth of the stator core 21 is set to 60, and four core outer peripheral protrusions 26 are provided at intervals of 90 degrees in the circumferential direction. For this reason, the core sheet 30 can be suitably rotated and laminated. Further, when the core sheet 30 or the magnetic plate 40 is formed by punching from a square steel plate, the area is set by punching so that the protruding portions 34 or the protruding portions 45 are respectively positioned at the four corners of the steel plate. Since it becomes possible to shape | mold the core sheet 30 or the magnetic board 40 from a smaller steel plate, it can contribute to the improvement of a yield.

  (9) Each of the frames 11 and 12 extends in the axial direction from the fastening and fixing portions 11c and 12c (connection fixing portion) that receives the axial clamping load applied from the through bolts 15, and the fastening and fixing portions 11c and 12c. It has a core outer peripheral protruding portion 26 of the stator core 21 and an abutting portion (a bottom surface 72a of the accommodating recess 72) that abuts in the axial direction. And the core outer periphery protrusion part 26 is clamped by the bottom face 72a of the accommodation recessed part 72 of each flame | frame 11 and 12 to an axial direction. According to this configuration, the bottom surface 72 a of the housing recess 72 can be configured to contact the core outer peripheral protrusion 26 on a straight line on which the clamping load of the through bolt 15 acts. For this reason, the couple based on the clamping load is not generated in each of the frames 11 and 12, and as a result, the deformation of each of the frames 11 and 12 can be more reliably suppressed.

  (10) The core outer circumferential protrusion 26 is provided with an engagement groove 26a (engagement recess) that engages with the through bolt 15 in the circumferential direction. Thereby, since the core outer periphery protrusion part 26 of the stator core 21 is engaged with the through bolt 15 that connects the frames 11 and 12 in the circumferential direction, it is possible to prevent the stator core 21 from slipping.

  (11) Since each of the frames 11 and 12 holds only the core outer peripheral protruding portion 26 in the stator core 21, generation of a couple of forces in each of the frames 11 and 12 can be more suitably suppressed.

  (12) The armature winding 22 is inserted into a plurality of slots S formed in the stator core 21 along the axial direction, and includes first and second projecting portions 52 and 53 projecting from the slots S in the axial direction. It comprises a plurality of segment conductors 25. The stator 13 in which the armature winding 22 is composed of the segment conductors 25 can be configured to have a high space factor of the armature winding 22 and easily generate heat. Therefore, heat is radiated by the core outer peripheral protrusion 26 of the stator core 21. By adopting the segment conductor 25 in a configuration having excellent properties, a more suitable configuration can be obtained.

  Further, the first and second projecting portions 52 and 53 of the segment conductor 25 are configured to face the rotor facing portion 44 of the magnetic plate 40 in the radial direction. As a result, the surface of the stator core 21 facing the rotor 14 can be secured by the rotor facing portion 44 of the magnetic plate 40 to achieve high output, and the size of the stator 13 in the axial direction can be suppressed.

  (13) Since the plate thickness T1 of the magnetic plate 40 is set to be thicker than the plate thickness T2 of the core sheet 30, it is possible to make it easy to capture magnetism through the magnetic plate 40, and as a result, higher output is achieved. Can contribute to Further, since the plate thickness T1 of the magnetic plate 40 is thicker than the plate thickness T2 of the core sheet 30, a large chamfered portion 43a (for example, the plate thickness T2 of the core sheet 30) is formed at the corner of the teeth constituting portion 43 of the magnetic plate 40. It is easy to form a chamfered portion having an arcuate cross section having a large radius of curvature Rm, and as a result, it is possible to suitably suppress damage to the bent portion of the segment conductor 25.

In addition, you may change the said embodiment as follows.
In the above embodiment, the core sheet 30 and the magnetic plate 40 are formed with the protrusions 34 and 45 constituting the core outer periphery protrusion 26, respectively, and the bottom surface 72 a of the housing recess 72 is relative to the protrusion 45 of the magnetic plate 40. However, the present invention is not particularly limited to this, and for example, a configuration as shown in FIGS. 10 and 11 may be used.

  10 and 11, the protrusion 45 is omitted from the magnetic plate 40 of the above embodiment, the outer peripheral edge of the annular portion 42 is circular, and the core outer periphery protrusion 26 is only the protrusion 34 of each core sheet 30. It consists of. And the bottom face 72a of the accommodation recessed part 72 is contact | abutting (clamping) to the protrusion part 34 of the core sheet 30 in the axial direction (refer FIG. 11).

  According to such a configuration, the clamping load applied to the caulking fixing portion (the convex portion 42a and the through hole 30d) between the magnetic plate 40 and the core sheet 30a can be further reduced. Further, since each frame 11, 12 is configured not to contact the magnetic plate 40 in the axial direction, the variation (tolerance) in the axial direction of each frame 11, 12 sandwiching the main core portion 31 is changed. As a result, it is possible to suppress fluctuations in the axial dimension of the entire motor 10. Note that when the plate thickness T1 of the magnetic plate 40 is made thicker than the plate thickness T2 of the core sheet 30 to improve the output as in the above embodiment, the plate thickness variation of the magnetic plate 40 increases. For this reason, by configuring each of the frames 11 and 12 so as not to contact the magnetic plate 40 in the axial direction, the effect of suppressing fluctuations in the axial dimension of the entire motor 10 becomes more remarkable.

  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 S, and joined by welding or the like on the second projecting portion 53 side. However, the present invention is not particularly limited to this. For example, as shown in FIG. 12, 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, twelve convex portions 32a (concave portions 32b) are provided at equal intervals in the circumferential direction (30 degree intervals) of the annular portion 32, but the number and formation positions are not particularly limited thereto. May be appropriately changed according to the configuration.

  In the above embodiment, two protrusions 42 a are provided corresponding to one protrusion 45 (eight in total), but the invention is not particularly limited thereto, and one protrusion 45 Correspondingly, one may be provided (a total of four).

In the above embodiment, the setting of the dowel diameter and the like of the caulking fixing portions (the convex portions 32a and 42a, the concave portions 32b and 42b, and the through holes 30c and 30d) may be appropriately changed according to the configuration.
-In above-mentioned embodiment, although the fitting part 71 was provided in each frame 11 and 12, it is not specifically limited to this, As the structure which abbreviate | omitted the fitting part 71 from each frame 11 and 12 of the said embodiment Also good. In addition, a fitting portion that is centered and fitted (externally fitted) to the core outer peripheral protruding portion 26 may be provided in the stator holding portions 11 b and 12 b of the frames 11 and 12.

  -In the said embodiment, although each frame 11 and 12 was formed with metal materials, such as aluminum and steel, it is not limited to this, If it has the intensity | strength comparable as a metal material, it will be a resin material. May be formed.

In the above embodiment, two through bolts 15 that connect the frames 11 and 12 are provided, but the present invention is not limited to this, and three or more through bolts 15 may be provided.
In the above embodiment, the core outer circumferential protrusion 26 is provided with the engaging groove 26a that engages with the through bolt 15 in the circumferential direction. 26, the engagement groove 26a may be omitted, and the core outer peripheral protrusion 26 may not be engaged with the through bolt 15.

  In the above embodiment, each frame 11, 12 is configured to sandwich only the core outer periphery protruding portion 26 in the stator core 21. However, for example, the outer peripheral edge of the cylindrical portion 23 at a position other than the core outer periphery protruding portion 26 is also included. It is good also as a structure clamped in each frame 11 and 12. FIG.

The number of teeth 24 of the stator core 21 is not limited to 60, and may be changed as appropriate.
In the above embodiment, four core outer circumferential protrusions 26 are provided at 90 ° intervals in the circumferential direction. However, for example, three at 120 ° intervals or two at 180 ° intervals may be provided. . In this case, the main core portion 31 can be configured by stacking the core sheets 30 punched from the steel plate with the same punching die while rotating the core sheet 30 by 120 degrees or 180 degrees in the circumferential direction. Further, in the configuration in which three core outer protrusions 26 are provided at intervals of 120 degrees, by rotating and laminating each core sheet 30 by 120 degrees, three cogging torque waves including a cogging torque component peculiar to the core sheet 30 are generated. It is possible to cancel, and as a result, the cogging torque can be reduced.

  In the above embodiment, the rotor facing portion 44 is formed in a trapezoidal shape when viewed in the radial direction. However, for example, it may be formed in a rectangular shape when viewed in the radial direction, as long as it has a shape capable of capturing magnetism. Good.

  In the above embodiment, the laminated portion 41 of the magnetic plate 40 includes the annular portion 42 and the tooth constituent portion 43. However, for example, the laminated portion 41 may be constituted by only the tooth constituent portion 43.

In the above embodiment, the magnetic plate 40 is caulked and fixed to the main core portion 31 (core sheet 30), but other than this, for example, it may be fixed by adhesion or welding.
In the above embodiment, the plate thickness T1 of the magnetic plate 40 is set to be thicker than the plate thickness T2 of the core sheet 30. However, the present invention is not limited to this, and the plate thickness T1 of the magnetic plate 40 is set to the thickness of the core sheet 30. It may be set equal to or thinner than the plate thickness T2.

  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. Moreover, in the said embodiment, although the stator core 21 was comprised from the main core part 31 which consists of the several core sheet | seat 30, and a pair of magnetic board 40, it is not specifically limited to this, The stator core 21 is the main core. You may comprise only the part 31 (core sheet 30).

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, a ferrite magnet is used as the field magnet 62 of the rotor 14, but other than this, for example, a neodymium magnet or the like may be used.

  In the above embodiment, the axial lengths of the rotor core 61 and the field magnet 62 of the rotor 14 are set to the axial length of the inner peripheral end of the stator core 21 (that is, the tip of the rotor facing portion 44 of one magnetic plate 40). To the tip of the rotor facing portion 44 of the other magnetic plate 40) may be set differently.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... Rear frame, 11c, 12c ... Fastening fixing | fixed part (connection fixing | fixed part), 12 ... Front frame, 13 ... Stator, 14 ... Rotor, 15 ... Through bolt (connection member), 21 ... Stator core, 22 ... Armature winding, 23 ... cylindrical part (main outer peripheral part), 24 ... teeth, 25, 25x, 25y ... segment conductor, 26 ... core outer peripheral protruding part (clamped part), 26a ... engaging groove (engaging recess) , 30, 30a ... core sheet, 30c, 30d ... through hole (caulking fixing part), 31 ... main core part, 32a, 42a ... convex part (caulking fixing part), 32b, 42b ... concave part (caulking fixing part), 34 , 45 ... Projection, 40 ... Magnetic plate, 41 ... Laminated part, 44 ... Rotor facing part, 71 ... Fitting part, 72a ... Bottom face (contact part) of housing recess, S ... Slot.

Claims (10)

A stator in which armature windings are mounted on a plurality of teeth extending radially inward from a main outer periphery of a stator core made of a plurality of core sheets laminated in the axial direction;
A first frame and a second frame that are provided on both sides of the stator core in the axial direction and sandwich the stator core in the axial direction;
A rotor rotatably supported by the first and second frames and disposed on an inner peripheral side of the stator, and the main outer peripheral portion of the stator core is between the first frame and the second frame. A motor configured to be exposed to the outside,
The stator core is formed by caulking the core sheets adjacent in the axial direction,
The stator core is formed with a sandwiched portion that protrudes radially outward from the main outer peripheral portion,
The first and second frames sandwich at least the sandwiched portion of the stator core in the axial direction ;
A connecting member that connects the first and second frames while applying an axial clamping load to the first and second frames on the outer peripheral side of the stator;
Each of the frames includes a connecting and fixing portion that receives an axial holding load applied from the connecting member, and an abutting that extends in the axial direction from the connecting and fixing portion and contacts the held portion of the stator core in the axial direction. And the sandwiched portion is sandwiched in the axial direction by the contact portion of each frame,
The motor according to claim 1, wherein the sandwiched portion is provided with an engaging recess that engages with the connecting member in a circumferential direction . The motor according to claim 1,
The stator core includes a main core portion in which a plurality of the core sheets are laminated in the axial direction, and a magnetic plate provided at an end portion in the axial direction of the main core portion,
The magnetic plate includes a laminated portion laminated on the core sheet at an axial end portion of the main core portion, and extends axially outward from an end portion of the laminated portion on the rotor side so as to be radial with the rotor. And a rotor facing portion facing the motor. The motor according to claim 2,
The laminated part of the said magnetic board is crimped and fixed to the said core sheet of the axial direction edge part in the said main core part, The motor characterized by the above-mentioned. The motor according to claim 3, wherein
A motor in which a caulking fixing portion between the magnetic plate and the core sheet is formed at a radially inner position of the sandwiched portion in a portion constituting a main outer peripheral portion of the stator core. The motor according to claim 3 or 4,
2. The motor according to claim 1, wherein the caulking fixing part between the magnetic plate and the core sheet and the caulking fixing part between the core sheets are both formed by dowel caulking, and their dowel diameters are set to be different from each other. The motor according to any one of claims 1 to 5,
The motor according to claim 1, wherein the caulking fixing portion between the core sheets is formed at a position on an inner diameter side with respect to a portion sandwiched between the frames in the main outer peripheral portion. The motor according to any one of claims 1 to 6,
The plurality of core sheets constituting the stator core are laminated in the axial direction while being rotated in the circumferential direction. The motor according to claim 7, wherein
The number of teeth of the stator core is set to 60,
The motor is characterized in that a plurality of the sandwiched portions are provided at intervals of 90 degrees, 120 degrees, and 180 degrees in the circumferential direction. The motor according to any one of claims 1 to 8 ,
Each of the frames clamps only the sandwiched portion of the stator core. The motor according to any one of claims 1 to 9 ,
The armature winding is composed of a plurality of segment conductors inserted into slots formed between the teeth of the stator core and projecting portions protruding in the axial direction from the slots are electrically connected to each other. A motor characterized by