JP6068163B2 - 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. The stator includes a stator core obtained by stacking a plurality of core sheets punched from a steel plate in the axial direction of the rotating shaft and integrally forming by caulking or the like, and a winding wound around the teeth of the stator core. . The frames are connected to each other by, for example, fastening through bolts with the stator core sandwiched from both sides in the axial direction. Thereby, each frame is integrally formed with the stator core sandwiched in the axial direction. Further, the rotating shaft of the rotor disposed inside the stator is rotatably supported by bearings assembled to the respective frames. In the motor having such a configuration, the outer peripheral surface of the stator core can be exposed to the outside from between the respective frames, so that the heat of the stator is easily released to the outside.

JP 2011-239533 A

  By the way, in the motor as described above, since the stator core has a laminated structure of a plurality of core sheets, due to variations in the dimensions (thickness, flatness, etc.) of each core sheet, both axial end surfaces (at both axial ends) of the stator core. It is difficult to maintain the parallelism of the core sheet), and the parallelism between the frames is also deteriorated. For this reason, with the motors described above, it is difficult to ensure the coaxiality of the bearings supported by each frame, and the smoothness of the rotor is hindered by the deterioration of the coaxiality of the bearings, resulting in noise and vibration. It will occur. In addition, since the inclination of the stator core becomes more prominent as the axial dimension (stack thickness) is increased, if the stator core is lengthened in the axial direction (that is, the stack thickness is increased) for higher output, the inclination of the stator core is increased. There is a possibility that the coaxiality of the bearing is further deteriorated due to the increase.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor capable of achieving high output while suppressing the inclination of the stator core by suppressing the stacking thickness. is there.

A motor that solves the above problems is provided on a stator core having a plurality of core sheets stacked in the axial direction of a rotating shaft, an armature winding provided on the stator core, and on both axial sides of the stator core. A first frame and a second frame that sandwich the stator core in the axial direction, and a rotor that is rotatably supported by the first and second frames and that faces the stator core in the radial direction. And the stator core is configured such that an outer peripheral surface of the stator core is exposed to the outside from between the first frame and the second frame, and the stator core includes a plurality of core sheets stacked in an axial direction. And a magnetic plate provided at an end portion in the axial direction of the main core portion, the magnetic plate in the main core portion It comprises a laminated portion laminated on the core sheet direction end portion, and a rotor opposing portion which faces the rotor and radially with is extended axially outwardly from the rotor side end portion of the laminated portion The outer diameter of the main core portion is larger than the outer diameter of the magnetic plate, and the first and second frames are not in contact with the magnetic plate in the axial direction, and the main core portion The main core portion is directly sandwiched in the axial direction in a state where the main core portion is in contact with the axial direction .

  According to this configuration, the rotor facing portion of the magnetic plate extends outward in the axial direction (on the side opposite to the main core portion), so that the thickness of the stator core can be suppressed without reducing the facing surface of the stator core facing the rotor. It becomes possible. As a result, the inclination of the stator core is suppressed by suppressing the stacking thickness. As a result, it is possible to secure a surface facing the rotor in the stator core and achieve high output while suppressing the inclination between the frames. Moreover, since it becomes possible to laminate | stack and fix the lamination | stacking part of a magnetic board similarly to several core sheets, it can aim at simplification of a manufacturing process.

According to this configuration, the first and second frames are configured to directly sandwich the main core portion in the axial direction, and can be configured not to contact the magnetic plate in the axial direction. For this reason, the fluctuation | variation (tolerance) of the axial direction of each flame | frame which pinches | interposes a main core part can be suppressed, As a result, it becomes possible to suppress the fluctuation | variation of the axial direction dimension of the whole motor. In addition, when the plate thickness of the magnetic plate is made larger than that of the core sheet to improve output, the plate thickness variation of the magnetic plate increases, so that each frame is a magnetic plate as in this configuration. By configuring so as not to contact in the axial direction, the effect of suppressing fluctuations in the axial dimension of the entire motor becomes more prominent.
A motor that solves the above problems is provided on a stator core having a plurality of core sheets stacked in the axial direction of a rotating shaft, an armature winding provided on the stator core, and on both axial sides of the stator core. A first frame and a second frame that sandwich the stator core in the axial direction, and a rotor that is rotatably supported by the first and second frames and that faces the stator core in the radial direction. And the stator core is configured such that an outer peripheral surface of the stator core is exposed to the outside from between the first frame and the second frame, and the stator core includes a plurality of core sheets stacked in an axial direction. And a magnetic plate provided at an end portion in the axial direction of the main core portion, the magnetic plate in the main core portion A laminated portion laminated on the core sheet at the end in the direction, and a rotor facing portion that extends axially outward from the end on the rotor side of the laminated portion and faces the rotor in the radial direction. The first and second frames are configured to sandwich the main core portion in the axial direction through the laminated portion of the magnetic plate.
According to this configuration, the rotor facing portion of the magnetic plate extends outward in the axial direction (on the side opposite to the main core portion), so that the thickness of the stator core can be suppressed without reducing the facing surface of the stator core facing the rotor. It becomes possible. As a result, the inclination of the stator core is suppressed by suppressing the stacking thickness. As a result, it is possible to secure a surface facing the rotor in the stator core and achieve high output while suppressing the inclination between the frames. Moreover, since it becomes possible to laminate | stack and fix the lamination | stacking part of a magnetic board similarly to several core sheets, it can aim at simplification of a manufacturing process.
According to this configuration, it is not necessary to reduce the size of the laminated portion of the magnetic plates so as not to interfere with the frame in the axial direction, so that a reduction in output can be suppressed. Also, when the plate thickness of the magnetic plate is made thicker than that of the core sheet to improve output, the plate thickness variation (tolerance) of the magnetic plate becomes large, and the plate thickness variation of the magnetic plate This affects the axial spacing, and thus the overall axial dimension of the motor. In this case, adjusting the number of core sheets with a relatively thin plate thickness can suppress fluctuations in the axial dimension of the entire motor. Is possible.
In the motor, the armature winding is inserted into a plurality of slots formed along the axial direction in the stator core, and a plurality of protrusions protruding in the axial direction from the slots are electrically connected to each other. The segment conductor is preferably configured such that the protruding portion of the segment conductor is opposed to the rotor facing portion of the magnetic plate in the radial direction.

  According to this configuration, since the projecting portion of the segment conductor in the axial direction faces the rotor facing portion of the magnetic plate in the radial direction, the facing surface of the stator core facing the rotor is secured by the rotor facing portion of the magnetic plate, and high output is achieved. While being planned, it is possible to suppress an increase in the size of the stator in the axial direction. In addition, a stator in which the armature winding is composed of segment conductors can increase the space factor of the armature winding, while the segment conductors are arranged in the slot in the radial direction, and thus easily generate heat in the radial direction. However, since the outer peripheral surface of the stator core is exposed to the outside from between the frames, the heat generated in the stator is preferably released to the outside.

In the motor, it is preferable that a chamfered portion is formed at a corner portion of the stacked portion constituting the axial end of the slot.
According to this structure, when bending the segment conductor which protrudes from the axial direction end of a slot, it can suppress that a segment conductor damages the corner | angular part of the laminated part of a magnetic board.

In the motor, it is preferable that a thickness of the magnetic plate is set larger than a thickness of the core sheet.
According to this configuration, it is possible to easily capture magnetism through the magnetic plate, which can contribute to higher output.

In the above motor, the field magnet of the rotor is preferably made of a ferrite magnet.
According to this configuration, the field magnet of the rotor is made of a relatively inexpensive ferrite magnet, which can contribute to cost reduction of the motor.

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 laminated portion of the magnetic plate and the core sheet can be fixed with a simple configuration.

  According to the motor of the present invention, it is possible to achieve high output while suppressing the inclination of the stator core by suppressing the stacking thickness.

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. 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 the motor of the same form 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 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 6, the stator core 21 includes a cylindrical portion 23 that forms the outer periphery thereof, and a plurality (60 in this 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 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 has an annular portion 32 having an annular shape and a plurality of teeth constituting portions 33 extending radially inward from the annular portion 32. Moreover, each core sheet 30 is laminated | stacked so that the teeth structure part 33 may overlap along an axial direction.

  As shown in FIGS. 2, 4, and 6, 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 thicker than the plate thickness T2 of the core sheet 30 of the main core portion 31 (see FIG. 1).

  The laminated portion 41 is formed with an annular portion 42 that forms an annular shape that overlaps the annular portion 32 of the core sheet 30 in the axial direction, and a plurality of teeth constituent portions 43 that extend radially inward from the annular portion 42. The teeth constituting portion 43 of the laminated portion 41 has the same shape as the teeth constituting portion 33 of the core sheet 30 in the axial direction view. The magnetic plate 40 is provided such that the annular portion 42 and the tooth constituent portion 43 of the laminated portion 41 overlap the annular portion 32 and the tooth constituent portion 33 of the core sheet 30 in the axial direction. The annular portions 32 and 42 of the core sheet 30 and the magnetic plate 40 constitute a cylindrical portion 23 of the stator core 21, and the tooth constituent portions 33 and 43 constitute a tooth 24 of the stator core 21. Moreover, the outer diameter of the annular part 42 of the laminated part 41 is formed smaller than the outer diameter of the annular part 32 of the core sheet 30 (see FIG. 2). Thereby, it is comprised so that the whole outer periphery of the annular part 32 of the core sheet 30 may be exposed in an axial view.

  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.

  As shown in FIG. 5, convex portions 45 (dowels) projecting in the plate thickness direction are formed by pressing in the annular portions 32 and 42 of the core sheet 30 and the laminated portion 41 of the magnetic plate. In each of the annular portions 32 and 42, a plurality of convex portions 45 (four in the present embodiment) are formed in the circumferential direction. Each annular portion 32, 42 has a concave portion 46 formed at the time of forming the convex portion 45 on the back side of each convex portion 45. Each convex portion 45 is press-fitted and fixed (caulked and fixed) to the concave portion 46 of the core sheet 30 adjacent in the axial direction. Thereby, the core sheets 30 are integrated to form the main core portion 31, and the magnetic plates 40 are fixed to both sides in the axial direction of the main core portion 31.

  As shown in FIG. 6, in each slot S of the stator core 21, a sheet-like insulating member 47 made of an insulating resin material is mounted. 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 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 (see FIG. 7).

[Armature winding]
As shown in FIGS. 6 and 8, 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 S, a first protruding portion 52 that protrudes from the slot S in one axial direction (rear frame 11 side), and a shaft that extends from the slot S. It has the 2nd protrusion part 53 which protrudes to a direction other side (front frame 12 side), and has comprised the substantially U shape folded by the 1st protrusion part 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 with a gap therebetween.

  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. The straight portion 51 is disposed inside the insulating member 47 in the slot S (see FIG. 6). 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 at the first and fourth from the inner side in the radial direction (the segment conductor 25x illustrated on the outer side in FIG. 8), 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. 8). 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 has 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 so that the straight portion 51 of the other segment conductor 25 or a special kind of The segment conductors 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 linear portion 51 at both axial ends of the slot S. Here, FIG. 7 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.

  Further, as shown in FIG. 8, the first protrusion 52 in which the folded portion 25a of the segment conductor 25 is formed is formed so as to incline (expand) radially outward. Thus, the folded portion 25a is biased radially outward from the radial center of the slot S, and the radial inner end 52a of the first protrusion 52 is radially outer than the radial inner end Sa of the slot S. It is comprised so that it may be located in. 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. The outer diameters of the stator holding portions 11b and 12b are formed larger than the outer diameter of the main core portion 31 of the stator holding portions 11b and 12b. 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. 8, outer fitting portions 11d and 12d are formed at the front end portions (axially inner end portions) 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, portions (exposed surfaces 31 a) where the outer peripheral edge of the main core portion 31 is exposed on both sides in the axial direction on the outer peripheral side of the laminated portion 41 of the magnetic plate 40 are formed on the stator holding portions 11 b and 12 b of the frames 11 and 12. It is pinched. Specifically, the stator holding portions 11 b and 12 b have outer fitting portions 11 d and 12 d that are fitted on outer peripheral edges at both axial ends of the main core portion 31, and the contact surfaces 11 e and 12 e are shafts of the main core portion 31. It is in contact with the exposed surfaces 31a on both sides 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 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 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 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 sandwiched between the frames 11 and 12 is provided at a main core portion 31 in which a plurality of core sheets 30 are laminated in the axial direction, and at an axial end portion of the main core portion 31. And a magnetic plate 40. The magnetic plate 40 is laminated on the core sheet 30 at the axial end portion of the main core portion 31, and extends from the end on the rotor 14 side of the laminated portion 41 to the outside in the axial direction. 14 and a rotor facing portion 44 that is radially opposed to each other. 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 surface facing the rotor 14 in the stator core 21 (inner circumferential surface of the stator core 21) is reduced. It is possible to suppress the thickness of the stator core 21 without doing so. Thereby, the inclination of the stator core 21 is suppressed by suppressing the stacking thickness, and as a result, the opposed surface of the stator core 21 to the rotor 14 is secured while suppressing the inclination of the frames 11 and 12, and high output is achieved. Is possible. Further, since the magnetic plate 40 has a flat laminated portion 41 laminated on the main core portion 31, the laminated portion 41 is fixed in the same manner as each core sheet 30 of the main core portion 31 (caulking fixed in this embodiment). This makes it possible to simplify the manufacturing process.

  (2) 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 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. In addition, 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 while the segment conductor 25 is arranged in the radial direction in the slot S. Although heat is likely to be generated in the radial direction, the outer peripheral surface of the stator core 21 (main core portion 31) is exposed to the outside from between the stator holding portions 11b and 12b of the frames 11 and 12, and thus heat generated in the stator 13 is generated. It is easy to escape to the outside.

  (3) A chamfered portion 43a is formed at a corner portion of the teeth constituting portion 43 of the magnetic plate 40 constituting the axial end of the slot S. For this reason, it is suppressed that force is locally applied from the corner part of teeth constituent part 43 to the peripheral bending part of the 1st and 2nd projection parts 52 and 53 of segment conductor 25, and the bending part Damage can be suppressed.

  (4) 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 easier 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.

  (5) The stator holding portions 11b and 12b of the frames 11 and 12 are configured so as to directly sandwich the outer peripheral edge (exposed surface 31a) of the main core portion 31 in the axial direction. It is comprised so that it may not contact | abut. For this reason, the fluctuation | variation (tolerance) of the axial direction of each flame | frame 11 and 12 which pinches | interposes the main core part 31 can be suppressed, As a result, it becomes possible to suppress the fluctuation | variation of the axial direction dimension of the motor 10 whole. Further, as in this embodiment, 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, the plate thickness variation of the magnetic plate 40 becomes large. 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.

(6) Since the field magnet 62 of the rotor 14 is made of a relatively inexpensive ferrite magnet, it can contribute to the cost reduction of the motor 10.
(7) Since the laminated portion 41 of the magnetic plate 40 is caulked and fixed to the core sheet 30 at the axial end portion of the main core portion 31, the magnetic plate 40 has a simple configuration including the convex portion 45 (the dowel) and the concave portion 46. The laminated portion 41 and the core sheet 30 can be fixed.

In addition, you may change the said embodiment as follows.
In the above embodiment, the stator holding portions 11 b and 12 b of the frames 11 and 12 directly sandwich the outer peripheral edge (exposed surface 31 a) of the main core portion 31 in the axial direction, and the axial direction with respect to the magnetic plate 40. However, the present invention is not particularly limited to this. For example, as shown in FIG. 9, the main core portion 31 is pivoted through the annular portion 42 (laminated portion 41) of the magnetic plate 40. You may comprise so that it may pinch | interpose to a direction. According to the configuration as shown in FIG. 9, it is not necessary to make the laminated portion 41 of the magnetic plate 40 small in the radial direction so as not to interfere with the stator holding portions 11 b and 12 b in the axial direction. Can be suppressed. Further, 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, by adjusting the number of the core sheets 30 that are thinner than the magnetic plate 40, It is possible to suppress variations 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 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. 10, 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 exposed surface 31 a is formed over the entire outer peripheral edge of the axial end surface of the main core portion 31 by making the outer diameter of the laminated portion 41 of the magnetic plate 40 smaller than the outer diameter of the core sheet 30. In addition, the exposed surface 31a is configured to be sandwiched between the stator holding portions 11b and 12b of the frames 11 and 12, but is not particularly limited thereto. For example, a protruding portion that protrudes radially outward from the outer peripheral surface of the main core portion 31 (core sheet 30) may be formed, and the protruding portion may be sandwiched between the stator holding portions 11b and 12b.

  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.

  In the above embodiment, the main core portion 31 of the stator core 21 has a laminated structure including a plurality of core sheets 30. However, for example, the main core portion 31 may be an integrally molded product formed by casting or the like.

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 field magnet 62 is provided on the outer peripheral surface of the rotor core 61. However, for example, the field magnet 62 may be embedded in the rotor core 61.
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.

  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.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) a stator in which an armature winding is provided on a stator core;
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;
The rotating shaft is rotatably supported by the first and second frames, and includes a rotor facing the stator core and a radial direction, and the stator core is disposed between the first frame and the second frame. A motor configured to have an outer peripheral surface exposed to the outside;
The stator core includes a main core portion 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 at an axial end portion of the main core portion, and a rotor that extends axially outward from an end portion on the rotor side of the laminated portion and faces the rotor in a radial direction. A magnetic plate having a facing portion;
The first and second frames are configured to directly sandwich the main core portion in the axial direction.

  Thereby, since each frame can be configured not to abut against the magnetic plate in the axial direction, variation (tolerance) in the axial direction of each frame sandwiching the main core portion can be suppressed. It becomes possible to suppress the variation in the axial dimension of the entire motor.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... Rear frame (first frame), 12 ... Front frame (second frame), 13 ... Stator, 14 ... Rotor, 18 ... Rotating shaft, 21 ... Stator core, 22 ... Armature winding, 25, 25x, 25y ... segment conductors, 30 ... core sheet, 31 ... main core part, 40 ... magnetic plate, 41 ... laminated part, 43a ... chamfered part, 44 ... rotor facing part, 52, 53 ... first and second projecting parts (Protrusion) 62, field magnet, S, slot.

Claims (7)

A stator core having a plurality of core sheets stacked in the axial direction of the rotating shaft, and a stator having an armature winding provided on the stator core;
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;
The rotating shaft is rotatably supported by the first and second frames, and includes a rotor facing the stator core and a radial direction, and the stator core is disposed between the first frame and the second frame. A motor configured to have an outer peripheral surface exposed to the outside;
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 is laminated on the core sheet at an axial end of the main core, and extends axially outward from an end of the laminated portion on the rotor side, and radially with the rotor. and it possesses a rotor opposing portion opposed to,
The outer diameter of the main core portion is formed larger than the outer diameter of the magnetic plate,
The first and second frames are configured to directly sandwich the main core portion in the axial direction in a state where the first and second frames are in axial contact with the main core portion without contacting the magnetic plate in the axial direction. A motor characterized by being made . A stator core having a plurality of core sheets stacked in the axial direction of the rotating shaft, and a stator having an armature winding provided on the stator core;
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 having the rotating shaft rotatably supported by the first and second frames and facing the stator core in a radial direction;
A motor configured such that an outer peripheral surface of the stator core is exposed to the outside from between the first frame and the second frame,
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 is laminated on the core sheet at an axial end of the main core, and extends axially outward from an end of the laminated portion on the rotor side, and radially with the rotor. And a rotor facing portion facing the
The motor according to claim 1, wherein the first and second frames are configured to sandwich the main core portion in the axial direction through the laminated portion of the magnetic plate. The motor according to claim 1 or 2 ,
The armature winding is composed of a plurality of segment conductors that are inserted into a plurality of slots formed in the stator core along the axial direction, and projecting portions that protrude in the axial direction from the slots are electrically connected to each other. ,
The motor according to claim 1, wherein the projecting portion of the segment conductor is configured to radially oppose the rotor facing portion of the magnetic plate. The motor according to claim 3 , wherein
The motor according to claim 1, wherein a chamfered portion is formed at a corner of the laminated portion constituting the axial end of the slot. The motor according to any one of claims 1 to 4 ,
The motor is characterized in that the thickness of the magnetic plate is set larger than the thickness of the core sheet. The motor according to any one of claims 1 to 5 ,
2. The motor according to claim 1, wherein the field magnet of the rotor is a ferrite magnet. The motor according to any one of claims 1 to 6 ,
The motor is characterized in 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.