JP6208574B2 - motor - Google Patents

Description

  The present invention relates to a motor.

  2. Description of the Related Art Conventionally, as shown in Patent Document 1, for example, a magnetic plate having a laminated portion laminated on a core on an axial end face of the core and a facing portion extending radially outward from the laminated portion and facing a magnet in a radial direction A motor having an auxiliary rotor core in Patent Document 1 is known. Thus, by providing the facing portion that faces the magnet in the radial direction, it is possible to increase the amount of magnetic capture.

JP-A-5-284679

  By the way, in the motor as described above, when the influence of the demagnetizing field occurs, the portion of the magnet facing the laminated portion of the magnetic plate having a substantially L-shaped cross section is easily demagnetized, and the magnet is matched to this demagnetized portion. It is preferable to determine the overall thickness (thickness in the radial direction).

  In order to suppress idling of the magnet (movement in the circumferential direction), it is conceivable to form a positioning part such as a protrusion on the surface of the core. However, the contact between the magnet and the positioning part can reduce the demagnetization resistance. May decrease.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor having a positioning portion that suppresses idling of a magnet and capable of increasing the resistance to demagnetization. .

  A motor that solves the above problem is a motor that includes a stator core and a stator having an armature winding provided on the stator core, and a rotor having a rotor core and a magnet provided on the surface of the rotor core on the stator side. The stator core includes a main core portion and a magnetic plate provided at an axial end portion of the main core portion, and the magnetic plate is laminated at an axial end portion of the main core portion; And a rotor facing portion that extends outward in the axial direction from the end of the laminated portion on the rotor side and faces the rotor in the radial direction, and the rotor core positions the magnet in the circumferential direction. And the positioning part is formed at a position that does not oppose at least the laminated part of the magnetic plate in the radial direction.

  According to this configuration, since the positioning portion for positioning the magnet in the circumferential direction is formed at a position that does not face the laminated portion of the magnetic plate in the radial direction, the portion that makes contact with the positioning portion of the magnet in the circumferential direction and the lamination of the magnet Since the part and the part which opposes to a radial direction become a different position in an axial direction, a demagnetization resistance can be improved.

In the motor, it is preferable that the positioning portion is formed at least at a central portion in the axial direction of the rotor.
According to this configuration, since the positioning portion is formed at the central portion in the axial direction, it is more reliably located at a position that does not oppose the laminated portion in the radial direction.

In the motor, it is preferable that the positioning portion is formed at least at an axial end portion of the rotor.
According to this configuration, the magnet having a certain length in the axial direction can be stably held (positioned) by forming the positioning portion at the axial end.

  In the motor, the positioning portion is formed in a mode in which a circumferential width gradually decreases toward the stator side in the radial direction, and the magnet has a circumferential end on the rotor core side in the radial direction at the positioning portion. It is preferable to be formed in a copied shape.

  According to this configuration, the circumferential width of the positioning portion is formed so as to decrease toward the stator side, and the circumferential end where the magnet contacts the positioning portion in the circumferential direction has a shape that follows the positioning portion. Therefore, when an inertial force is generated in the magnet with the rotation of the rotor, only a part of the inertial force acts on the positioning portion. For this reason, it becomes possible to suppress damage to a magnet or a positioning part. Moreover, since the positioning part located between magnets becomes small toward a stator side, the distance between magnets can be narrowed and the circumferential direction width | variety of a magnet can be enlarged.

  In the motor, the positioning portion has slopes on both sides in the circumferential direction, and the slopes on both sides in the circumferential direction are symmetrical with respect to a straight line passing through the radial center and the circumferential center of the positioning portion. Is preferred.

  According to this configuration, the slopes on both sides in the circumferential direction of the positioning portion are symmetrical with respect to a straight line passing through the circumferential center of the positioning portion. For this reason, the shape of the magnet located in the circumferential direction both sides of a positioning part can be made the same.

In the motor, the magnet is preferably sandwiched and fixed in a radial direction between the rotor core and a cylindrical cover.
According to this configuration, since the magnet is sandwiched and fixed in the radial direction between the rotor core and the cylindrical cover, the magnet can be fixed without performing adhesive fixing with an adhesive or the like. Moreover, when fixing a magnet using an adhesive together, the adhesive force can be reinforced. Furthermore, damage to the stator and the like due to scattering of the magnet can be suppressed by the cover. In addition, when the positioning portion is configured so that the circumferential width becomes smaller toward the stator side, the inertia force of the magnet accompanying the rotation of the rotor can be received by the cover, so that the idling of the magnet can be more reliably suppressed. Can do.

In the motor, the rotor core and the stator core are preferably configured by stacking a plurality of core sheets in the axial direction.
According to this configuration, since both the rotor core and the stator core are configured by laminating a plurality of core sheets in the axial direction, for example, the so-called common core is formed by punching the core sheets of both cores from a plate-like member by press molding. Can be taken.

  The motor includes a first frame and a second frame that are provided on both sides in the axial direction of the stator core and sandwich the stator core in the axial direction, and the outer periphery of the stator core is between the first frame and the second frame. It is preferable that the surface is configured to be exposed to the outside.

  According to this configuration, when the stator core is sandwiched in the axial direction between the frames, the outer peripheral surface of the stator core is exposed, so that the heat of the stator core (stator) can be easily released to the outside.

In the motor, it is preferable that 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, it is not necessary to reduce the size of the laminated portion of the magnetic plates so as not to interfere with each frame in the axial direction, so that a reduction in output can be suppressed.

  In the motor, the main core portion of the stator core is configured by laminating a plurality of plate-shaped core sheets in the axial direction, and the plate thickness of the magnetic plate is set to be thicker than the plate thickness of the core sheet. It is preferable.

According to this configuration, the thickness of the magnetic plate can be made thicker than the thickness of the core sheet so that the magnetism can be easily taken in through the magnetic plate, which can contribute to higher output.
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 and easily generate heat, but the outer peripheral surface of the stator core is exposed from between the frames to the outside. Therefore, it is preferable that the heat generated in the stator is easily released to the outside.

  According to the motor of the present invention, the demagnetization resistance can be increased in the configuration having the positioning portion that suppresses the idling of the magnet.

It is a schematic cross section of the motor of the embodiment. It is a top view of the motor 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 a part of motor of the same form. 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. It is a schematic cross section which expands and shows the motor of another example partially. (A) is a top view of the motor of another example, (b) is an enlarged plan view enlarging a part of (a).

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 distal end 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.

  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 FIGS. 1, 2, and 8, the rotor 14 includes a rotating shaft 18 that is supported by bearings 16, 17, a cylindrical rotor core 61 that is fixed to the rotating shaft 18 so as to be integrally rotatable, and a rotor core. The plurality of (10 in the present embodiment) field magnets 62 are fixed to the outer peripheral surface of 61.

  As shown in FIG. 8, the rotor core 61 is configured by laminating a plurality of first and second core sheets 61a and 61b in the axial direction. The 1st core sheet 61a is provided with the annular | circular shaped annular part 61c as shown in FIG. The second core sheet 61b has a plurality of protrusions 61d in the circumferential direction as positioning portions protruding outward in the radial direction on the radially outer surface of the annular portion 61c having substantially the same shape as the first core sheet 61a.

  As shown in FIG. 8, the rotor core 61 of the present embodiment has a plurality of second core sheets 61b each having the protrusion 61d at the substantially center in the axial direction, and a plurality of first core sheets 61a on both sides in the axial direction. It is constructed by stacking. That is, the rotor core 61 is configured such that the protrusion 61d is located on the axially central side.

  As shown in FIG. 2, 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. Each field magnet 62 is a so-called segment magnet fixed to the outer peripheral surface of the rotor core with a gap in the circumferential direction.

  The axial lengths of the rotor core 61 and the field magnet 62 of the rotor 14 are the axial lengths of the inner peripheral end portions of the stator core 21 (that is, from the tip of the rotor facing portion 55 of one magnetic plate 40 to the other magnetic plate 40). The length of the rotor facing portion 44 is set to be long. That is, the field magnet 62 is opposed to the inner peripheral surface of the main core portion 31 of the stator core 21 and the rotor facing portion 44 of each magnetic plate 40 in the radial direction. Each field magnet 62 is disposed in contact with the protrusion 61d provided substantially at the center side in the axial direction of the rotor core 61 in the circumferential direction or with a slight gap therebetween, thereby suppressing displacement in the circumferential direction (idling). It has been.

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

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.

  In addition, the rotor core 61 of the rotor 14 is configured such that a field magnet 62 fixed on the outer peripheral surface thereof abuts on a protrusion 61 d of the rotor core 61 in the circumferential direction. For this reason, the position shift of the circumferential direction of the field magnet 62 is suppressed. Since the protrusion 61d is provided at the axial center of the rotor core 61 so as not to face the magnetic plate 40 in the radial direction, the portions that are easily demagnetized are dispersed in the axial direction. It becomes possible to increase magnetism.

  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, the effect of this embodiment will be described.
(1) Since the projection 61d for positioning the magnet in the circumferential direction is formed at a position that does not face the laminated portion 41 of the magnetic plate 40 in the radial direction, the portion that abuts the projection 61d of the field magnet 62 in the circumferential direction Further, since the laminated portion 41 of the field magnet 62 and the portion facing in the radial direction are located at different positions in the axial direction, it is possible to improve the anti-magnetism.

(2) Since the protruding portion 61d is formed at the axially central portion, it is more reliably positioned so as not to oppose the laminated portion 41 in the radial direction, so that the demagnetization resistance can be more reliably increased.
(3) Since each of the rotor core 61 and the stator core 21 is configured by laminating a plurality of core sheets 61a, 61b, 30 in the axial direction, for example, the core sheets 61a, 61b, 30 of both cores 61, 21 from a plate-like member. It is possible to perform so-called co-removal, which is formed by punching out by pressing.

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

  (5) 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, even higher output. Can contribute to

  (6) 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.

  (7) The armature winding 22 is inserted into the 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 slot 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. Further, the stator 13 in which the armature winding 22 is configured by the segment conductor 25 can be configured with a high space factor of the armature winding 22. On the other hand, since the segment conductors 25 are arranged in the slot S in the radial direction, heat is generated easily in the radial direction. However, the outer peripheral surface of the stator core 21 (main core portion 31) is the stator holding portion 11b of each frame 11, 12. , 12b is exposed to the outside, so that heat generated in the stator 13 can be easily released to the outside.

In addition, you may change the said embodiment as follows.
In the above embodiment, the protrusion 61d as the positioning portion is provided at the central portion in the axial direction of the rotor core 61 as a position that does not oppose the laminated portion 41 of the magnetic plate 40 in the radial direction.

  For example, as shown in FIG. 9, a configuration may be employed in which a protrusion 61 d is provided at the axial center of the rotor core 61 and a protrusion 61 d is provided at the axial end of the rotor core 61. Alternatively, a configuration in which the protrusion 61d is provided only at the axial end of the rotor core 61 may be employed. By providing the protrusions 61d at both axial ends of the rotor core 61, the protrusions 61d and the longitudinal end portions (both axial end portions) of the field magnet 62 can be brought into contact with each other in the circumferential direction. The magnet 62 can be stably held (positioned).

  In the above embodiment and each modification, the protrusion 61d is provided at a position that does not oppose both the laminated portion 41 and the rotor facing portion 44 of the magnetic plate 40 in the radial direction, but at least the laminated portion 41 and the radial direction are provided. The axial position of the protruding portion 61d may be changed as long as the position does not face the projection.

  In the above embodiment, the shape of the protrusion 61d as the positioning portion is not specifically mentioned, but various shapes can be adopted. As shown in FIG. 2, the protrusion 61 d may be configured to have a rectangular shape when viewed in the axial direction.

  Further, as shown in FIGS. 12A and 12B, the protrusion 61d may be formed so that the circumferential width becomes narrower toward the outer side in the radial direction. More specifically, as shown in FIG. 12, the protrusion 61d has inclined surfaces 71 on both sides in the circumferential direction so that the circumferential width becomes narrower toward the radially outer side on the stator 13 side. The slope 71 has a shape that is symmetric with respect to a straight line X1 that passes through the radial center O and the circumferential center of the protrusion 61d.

  As shown in FIGS. 12 (a) and 12 (b), the field magnet 62 has a slope 62b that is radially inward and the corners 62a on both sides in the circumferential direction are substantially parallel to the slopes 71 on both sides in the circumferential direction of the protrusion 61d. Have The field magnet 62 is sandwiched and fixed in the radial direction by the rotor core 61 and the cylindrical cover 72.

  By configuring the protrusion 61d and the field magnet 62 as described above, when the inertial force F1 acts on the field magnet 62 as the rotor 14 rotates, the field magnet 62 is inclined by the slope 62b of the corner 62a. Comes into contact with the slope 71 of the protrusion 61d, and the inertial force F1 is separated into a component force F2 in a direction perpendicular to the slope 71 and a component force F3 in a direction parallel to the slope 71.

  As a result, the component force F3 in the parallel direction is mainly received by the cylindrical cover 72. And since the component force F2 of the direction orthogonal to the slope 71 acts on the projection part 61d, the inertial force which acts on the projection part 61d can be reduced, and damage to the projection part 61d and the field magnet 62 can be suppressed.

  Further, since the field magnet 62 is formed with a corner 62a having a slope 62b in surface contact with the slope 71 of the protrusion 61d, it is possible to suppress stress concentration when the component force F2 acts on the protrusion 61d. It becomes.

  For this reason, it can fix without performing the adhesion fixation by an adhesive agent etc. In addition, when the field magnet 62 is fixed using an adhesive, the adhesive strength can be reinforced. Further, the cover 72 can suppress damage to the stator 13 and the like due to scattering of the field magnet 62. Further, when the protrusion 61 d is configured to have a circumferential width that decreases toward the stator 13, the cover 72 receives the inertial force (component force F <b> 3) of the field magnet 62 accompanying the rotation of the rotor 14. Therefore, idling of the field magnet 62 can be suppressed more reliably.

  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. 10, the main core portion 31 may be sandwiched in the axial direction via the annular portion 42 (laminated portion 41) of the magnetic plate 40. According to the configuration shown in FIG. 10, 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 11b and 12b 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. 11, 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, the ferrite magnet is used as the field magnet 62 of the rotor 14, but other magnets such as a neodymium magnet may be used.

  In the above embodiment, the 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 portion of the stator core 21 (that is, from the tip of the rotor facing portion 55 of one magnetic plate 40). The other magnetic plate 40 is configured to be longer than the tip of the rotor facing portion 44), but is not limited thereto. For example, the axial lengths of the rotor core 61 and the field magnet 62 of the rotor 14 may be configured to be substantially equal to the axial length of the inner peripheral end of the stator core 21. Further, the axial lengths of the rotor core 61 and the field magnet 62 of the rotor 14 may be configured to be slightly shorter than the axial length of the inner peripheral end of the stator core 21.

  In the above embodiment, the axial length of the field magnet 62 is shorter than the axial length of the rotor core 61. However, the present invention is not limited to this, and the axial length of the field magnet 62 is It may be longer than the axial length. Further, the axial length of the field magnet 62 and the axial length of the rotor core 61 may be the same.

  In the above embodiment, the rotor core 61 has a laminated structure composed of a plurality of first and second core sheets 61a and 61b. However, for example, the rotor core 61 may be an integrally molded product formed by casting or the like. However, even in such a configuration, the protrusion 61d as the positioning portion is formed.

  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.

  -You may combine the said embodiment and said each modification suitably.

  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 (Projecting part), 61 ... rotor core, 61a ... first core sheet, 61b ... second core sheet, 61d ... projection as positioning part, 62 ... field magnet, 71 ... slope, 72 ... cover, O ... radial direction Center, S ... slot, T1, T2 ... plate thickness, X1 ... straight line.

Claims (11)

A stator in which an armature winding is provided on a stator core;
A rotor provided with magnets on the surface of the rotor core on the stator side;
A motor equipped with
The stator core includes a main core portion and a magnetic plate provided at an axial end portion of the main core portion,
The magnetic plate includes a laminated portion laminated at an axial end portion of the main core portion, a rotor extending radially outward from an end portion on the rotor side of the laminated portion and facing the rotor in a radial direction. Having a facing portion,
The rotor core includes a positioning portion that positions the magnet in the circumferential direction,
The motor is characterized in that the positioning portion is formed at a position that does not face at least the laminated portion of the magnetic plates in the radial direction. The motor according to claim 1,
The motor is characterized in that the positioning part is formed at least in the axially central part of the rotor. The motor according to claim 1 or 2,
The motor is characterized in that the positioning portion is formed at least at an axial end portion of the rotor. The motor according to any one of claims 1 to 3,
The positioning portion is formed in a mode in which the circumferential width gradually decreases toward the stator side in the radial direction,
The motor is characterized in that a circumferential end portion on the rotor core side in the radial direction is formed in a shape following the positioning portion. The motor according to claim 4,
The positioning part has slopes on both sides in the circumferential direction,
The inclined surfaces on both sides in the circumferential direction are symmetrical with respect to a straight line passing through the radial center and the circumferential center of the positioning portion. In the motor according to any one of claims 1 to 5,
The motor, wherein the magnet is clamped and fixed in a radial direction by the rotor core and a cylindrical cover. In the motor according to any one of claims 1 to 6,
The rotor core and the stator core are configured by stacking a plurality of core sheets in the axial direction. In the motor according to any one of claims 1 to 7,
A first frame and a second frame provided on both sides of the stator core in the axial direction and sandwiching the stator core in the axial direction;
The motor 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. The motor according to claim 8, 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. In the motor according to any one of claims 1 to 9,
The main core portion of the stator core is configured by laminating a plurality of plate-like core sheets in the axial direction,
The motor is characterized in that the thickness of the magnetic plate is set larger than the thickness of the core sheet. In the motor according to any one of claims 1 to 10,
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.