JP6047412B2 - 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 plurality of segment conductors (segment conductors) are inserted into a stator core slot and a predetermined segment conductor is connected to a stator of a motor. Line). Since such a stator can be configured with a high space factor of the winding, it can be said to be an advantageous configuration for downsizing in the radial direction.

JP 2011-239533 A

  In the stator using the armature winding as described above, the protruding portions protruding in the axial direction from the slots in the segment winding are bent and connected to each other in the circumferential direction. Since it is difficult to bend substantially perpendicularly along the end face, the protruding amount of the protruding portion of the segment conductor increases in the axial direction, and as a result, the stator increases in size in the axial direction.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor that can suppress an increase in the size of the stator in the axial direction using a segment conductor while ensuring output. There is to do.

A motor that solves the above-described problem includes a stator in which an armature winding is provided on a stator core, and a rotor that faces the stator core in a radial direction, and the armature winding extends along the axial direction of the stator core. A motor comprising a plurality of segment conductors inserted into a plurality of formed slots and protruding in the axial direction from the slots and electrically connected to each other, wherein the stator core includes a main core portion, A magnetic plate provided at an end portion in the axial direction of the main core portion, and the magnetic plate extends outward in the axial direction from an end portion on the rotor side of the main core portion and faces the rotor in the radial direction. It has a rotor opposing section which, the projecting portion of the conductor segment is opposed via a gap to the rotor opposing portion and the radial direction, the armature windings, each segment guide There will be welded at the projecting portion of the at least one axial side, the weld joint of the projecting portion is formed axially outward from the axial front end of the rotor opposing portion.

  According to this configuration, the stator core has the magnetic plate having the rotor facing portion extending from the main core portion to the axially outer side (on the side opposite to the main core), and the rotor facing portion is a protruding portion of the segment conductor protruding from the slot. And are configured to face each other in the radial direction. For this reason, by suppressing the axial length of the main core portion of the stator core to be small, it is possible to secure a facing surface of the stator core facing the rotor by the rotor facing portion of the magnetic plate while suppressing the increase in size of the stator in the axial direction. Output can be secured. Further, since a radial gap is formed between the protruding portion of the segment conductor and the rotor facing portion, interference between the protruding portion of the segment conductor and the rotor facing portion is suppressed, and as a result, the rotor facing portion and the segment Insulation with the conductor can be suitably secured. Further, for example, an increase in cogging torque and a decrease in output due to deformation of the rotor facing portion due to interference with the protruding portion of the segment conductor are suppressed.

In addition, since the welded joint of the projecting portion of the segment conductor is formed on the axially outer side (on the side opposite to the main core portion) of the rotor facing portion in the axial direction, the rotor facing portion becomes an obstacle in the welding operation of the projecting portion It is difficult to weld and join the protrusions easily.
In the motor, it is preferable that the projecting portion of the segment conductor is configured to be positioned on the side opposite to the rotor facing portion than the end portion on the rotor facing portion side of the slot.

  According to this configuration, the gap between the protruding portion of the segment conductor and the rotor facing portion can be ensured without using a configuration in which the slot is separated from the rotor facing portion in the radial direction. For this reason, it is possible to suppress interference between the protruding portion of the segment conductor and the rotor facing portion while suppressing an increase in the radial size of the stator core.

  In the motor, the segment conductor is integrally formed with a pair of straight portions inserted into the slots having different circumferential positions, and a folded portion connecting the pair of straight portions at the protruding portion on one axial end side. It is preferable that the folded portion is made of a formed wire, and is formed so as to be biased toward the opposite rotor side with respect to the radial center of the slot.

According to this configuration, in the segment conductor having a shape folded at the protruding portion on one end side in the axial direction, a gap between the protruding portion of the segment conductor and the rotor facing portion can be suitably secured.
In the motor, it is preferable that the armature winding is formed by welding the segment conductors at the protruding portions on both sides in the axial direction.

  According to this configuration, when the segment conductor is folded at the protruding portion on one end side in the axial direction, the radial bulge that may occur at the folded portion does not occur, so the protruding portion of the segment conductor and the rotor facing portion This gap can be suitably secured.

In the motor, it is preferable that the magnetic plate includes a stacked portion that is stacked on an end portion in the axial direction of the main core portion.
According to this configuration, for example, the laminated portion of the magnetic plates can be laminated and fixed similarly to the plurality of core sheets, so that the manufacturing process can be simplified.

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 the main core portion includes a plurality of core sheets stacked in an axial direction, and the thickness of the magnetic plate is set to be greater than the 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. Further, when the chamfered portion is formed at the corner of the laminated portion of the magnetic plate that constitutes the axial end of the slot, the magnetic plate laminated portion is formed by the magnetic plate being thicker than the core sheet. It is easy to form a chamfered portion on the surface, which is more preferable.

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.

  According to the motor of the present invention, it is possible to suppress the increase in size of the stator using the segment conductor in the axial direction while securing the output.

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. The first and second projecting portions 52 and 53 are opposed to the rotor facing portions 44 on both sides in the axial direction in the radial direction via gaps D1 and D2, respectively.

  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 includes a second protrusion 53 that protrudes toward the front frame 12 through the slot S in the axial direction, and is bent in the circumferential direction to form a second protrusion 53 of another segment conductor 25 or a special portion. The segment conductors are electrically connected to each other by welding or the like, whereby the segment conductors 25 constitute the armature windings 22. In FIG. 8, a portion where the second protrusions 53 of the segment conductors 25 inserted in the slots S having different circumferential positions are welded together is schematically shown as a welded joint 54.

  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. As a result, a gap D1 between the first protrusion 52 and the rotor facing portion 44 of the magnetic plate 40 in the radial direction is widened, and thus interference between the first protrusion 52 and the rotor facing portion 44 is more preferably suppressed. Has been. 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. D2 can be easily secured. Further, the weld joint portion 54 of the second protrusion 53 is formed on the outer side in the axial direction (on the side opposite to the main core portion) than the front end portion 44b in the axial direction of the rotor facing portion 44 on the front frame 12 side. Thereby, in the welding operation of the 2nd protrusion part 53, the rotor opposing part 44 does not become obstructive easily, the 2nd protrusion part 53 can be weld-joined easily, and workability | operativity is improved.

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

  Moreover, since the stack thickness of the main core portion 31 of the stator core 21 is suppressed while the output is secured by the rotor facing portion 44, the variation (tolerance) of the stack thickness of the main core portion 31 can be suppressed to be small. Thereby, the fluctuation | variation of the space | interval of the axial direction of each flame | frame 11 and 12 which pinches | interposes the main core part 31 is suppressed, and the fluctuation | variation of the axial direction dimension of the motor 10 whole is suppressed by extension. Note that the variation (tolerance) of the magnetic plate 40 increases as the plate thickness T1 increases. However, as in the present embodiment, the frames 11 and 12 sandwich only the main core portion 31 and the magnetic plate 40. Is configured so as not to abut in the axial direction, so that fluctuations in the axial dimension of the entire motor 10 can be further suppressed.

  In addition, the segment conductor 25 includes not only the second protrusion 53 that is welded but also the first protrusion 52 having a bent portion 25a that is curved and formed on the radially outer side of the radially inner end Sa of the slot S. It is comprised so that it may be located on the (opposite rotor opposing part side). For this reason, the gaps D1 and D2 between the first and second projecting portions 52 and 53 of the segment conductor 25 and the rotor facing portion 44 are ensured even if the slot S is not separated from the rotor facing portion 44 radially outward. Can be done. Accordingly, it is possible to suppress interference between the first and second projecting portions 52 and 53 of the segment conductor 25 and the rotor facing portion 44 while suppressing an increase in size of the stator core 21 in the radial direction.

  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 magnetic plates 40 respectively provided at both ends in the axial direction of the main core portion 31 are extended from the radially inner end portion (end portion on the rotor 14 side) of the main core portion 31 to the outer side in the axial direction. And a rotor facing portion 44 that faces in the radial direction. The first and second projecting portions 52 and 53 of the segment conductor 25 are opposed to the rotor facing portion 44 in the radial direction via gaps D1 and D2, respectively. As a result, the axial length of the main core portion 31 is kept small, thereby suppressing the increase in size of the stator 13 in the axial direction, while the rotor facing portion 44 of the magnetic plate 40 faces the rotor 14 facing the rotor 14. Can be secured, that is, the output can be secured.

  Further, since the radial gaps D1 and D2 are formed between the first and second projecting portions 52 and 53 of the segment conductor 25 and the rotor facing portion 44, respectively, the first and second projecting portions 52 and 53 are formed. And the rotor facing portion 44 are suppressed, and as a result, the insulation between the rotor facing portion 44 and the segment conductor 25 can be suitably secured. Further, for example, an increase in cogging torque and a decrease in output due to the deformation of the rotor facing portion 44 due to the interference with the first and second projecting portions 52 and 53 can be suppressed.

  In addition, since it is possible to suppress the thickness of the stator core 21 while ensuring the output by the rotor facing portion 44, the inclination of the stator core 21 can be suppressed by suppressing the thickness. Thereby, since inclination of each frame 11 and 12 is suppressed, the deterioration of the coaxiality of each bearing 16 and 17 is suppressed, As a result, it becomes possible to suppress the noise and vibration which arise by the axial shift of the rotor 14. Become.

  (2) The first and second projecting portions 52 and 53 of the segment conductor 25 are radially outer (on the side opposite to the rotor) than the radially inner end Sa (the end on the rotor facing portion 44 side) of the slot S. It is comprised so that it may be located in. Therefore, it is possible to secure a gap between the first and second projecting portions 52 and 53 of the segment conductor 25 and the rotor facing portion 44 without having to configure the slot S to be radially outward from the rotor facing portion 44. it can. For this reason, it is possible to suppress interference between the first and second projecting portions 52 and 53 of the segment conductor 25 and the rotor facing portion 44 while suppressing an increase in size of the stator core 21 in the radial direction.

  (3) The segment conductor 25 is integrally formed with a pair of straight portions 51 that are respectively inserted into slots S having different circumferential positions, and a folded portion 25a that connects the pair of straight portions 51 in the first projecting portion 52. Made of wire rod. The folded portion 25a is formed so as to be biased toward the counter-rotor facing portion with respect to the radial center of the slot S. For this reason, in the segment conductor 25 having a substantially U-shaped shape, the gap D1 between the first projecting portion 52 having the folded portion 25a and the rotor facing portion 44 can be suitably secured.

  (4) In the armature winding 22, each segment conductor 25 is welded and joined at the second projecting portion 53 on the front frame 12 side, and the welded joint portion 54 of the second projecting portion 53 is formed on the rotor facing portion 44. It is formed on the outer side in the axial direction (on the side opposite to the main core part) than the front end 44b in the axial direction. For this reason, in the welding operation of the 2nd protrusion part 53, the rotor opposing part 44 does not become obstructive easily, and the 2nd protrusion part 53 can be weld-joined easily.

  (5) Since the magnetic plate 40 includes the laminated portion 41 laminated on the end portion in the axial direction of 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 (in this embodiment, It is possible to perform crimping and simplification of the manufacturing process.

  (6) A chamfered portion 43a is formed at a corner of the teeth constituting portion 43 of each magnetic plate 40 constituting both ends of the slot S in the axial direction. 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.

  (7) 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 easily take in magnetism through the magnetic plate 40, and as a result, a 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.

(8) 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.
(9) Since the armature winding 22 is configured by the segment conductor 25, the space factor of the armature winding 22 can be improved. Further, when the armature winding 22 is constituted by the segment conductor 25, the segment conductor 25 is arranged in the radial direction in the slot S, so that heat is generated easily in the radial direction, but the outer periphery of the stator core 21 (main core portion 31) Since the surface is exposed to the outside from between the stator holding portions 11b and 12b of the frames 11 and 12, heat generated in the stator 13 is easily released to the outside.

  (10) 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.

  (11) 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 segment conductors 25 may be welded and joined at the first and second projecting portions 52 and 53 on both sides in the axial direction. Good. In FIG. 10, a portion where the projecting portions 52 and 53 of the segment conductor 25 inserted into the slots S having different circumferential positions are welded together is schematically shown as a welded joint 54. According to this configuration, when the segment conductor is folded in a substantially U shape, the radially inward bulging that may occur in the folded portion does not occur. The gaps D1 and D2 can be suitably secured. In addition, it is preferable that each welding joint part 54 is formed in the axial direction outer side (anti-main core part side) rather than the axial direction front-end | tip part 44b of the rotor opposing part 44, According to this, each protrusion part 52,53 is formed. In this welding operation, the rotor facing portion 44 does not easily get in the way, and the protruding portions 52 and 53 can be easily welded together. 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 weld joint 54 of the second protrusion 53 is formed on the outer side in the axial direction (on the side opposite to the main core) than the front end 44b in the axial direction of the rotor facing portion 44 on the front frame 12 side. However, the present invention is not limited thereto, and the welded portion of the second protrusion 53 may be formed on the inner side in the axial direction (on the main core portion 31 side) than the axial tip 44b of the rotor facing portion 44. According to this configuration, the second protruding portion 53 can be configured not to protrude outward in the axial direction from the rotor facing portion 44, which can contribute to the downsizing of the stator 13 in the axial direction.

  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 stator core 21 is sandwiched between the pair of frames 11 and 12. However, for example, the stator core 21 may be fixed to a cylindrical metal housing by press fitting or shrink fitting. Good.

  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.

  DESCRIPTION OF SYMBOLS 10 ... Motor, 11 ... Rear frame, 12 ... Front frame, 13 ... Stator, 14 ... Rotor, 18 ... Rotating shaft, 21 ... Stator core, 22 ... Armature winding, 25, 25x, 25y ... Segment conductor, 25a ... Folding 30 ... Core sheet, 31 ... Main core part, 40 ... Magnetic plate, 41 ... Laminated part, 43a ... Chamfered part, 44 ... Rotor facing part, 51 ... Linear part, 52, 53 ... First and second projecting parts (Projecting part), 54 ... weld joint, 62 ... field magnet, S ... slot, D1, D2 ... gap.

Claims (8)

A stator in which armature windings are provided on the stator core, and a rotor that faces the stator core in the radial direction,
The armature winding is composed of a plurality of segment conductors inserted into a plurality of slots formed in the stator core along the axial direction, and projecting portions protruding in the axial direction from the slots are electrically connected to each other. A motor,
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 has a rotor facing portion that extends outward in the axial direction from the end of the main core portion on the rotor side and faces the rotor in the radial direction;
The protruding portion of the segment conductor is opposed to the rotor facing portion with a gap in the radial direction ,
The armature winding is formed by welding the segment conductors at least at the protruding portion on one side in the axial direction, and the welded connecting portion of the protruding portion is axially outside the axial tip of the rotor facing portion. It is formed in the motor characterized by the above-mentioned. The motor according to claim 1,
The motor according to claim 1, wherein the protruding portion of the segment conductor is positioned on the side opposite the rotor from the end on the rotor facing portion side of the slot. The motor according to claim 2,
The segment conductor is a wire rod in which a pair of linear portions respectively inserted into the slots having different circumferential positions and a folded portion connecting the pair of linear portions at the protruding portion on one axial end side are integrally formed. And
The motor according to claim 1, wherein the folded portion is formed so as to be biased toward the opposite rotor side with respect to the radial center of the slot. The motor according to claim 2,
The motor according to claim 1, wherein the armature winding is formed by welding the segment conductors at the protruding portions on both sides in the axial direction. The motor according to any one of claims 1 to 4 ,
The motor according to claim 1, wherein the magnetic plate includes a laminated portion laminated on an end portion in the axial direction of the main core portion. The motor according to claim 5 , 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 6 ,
The main core portion is composed of a plurality of core sheets laminated 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. The motor according to any one of claims 1 to 7,
2. The motor according to claim 1, wherein the field magnet of the rotor is a ferrite magnet.