JP5128356B2 - Stator manufacturing apparatus and stator manufacturing method - Google Patents

Description

  The present invention relates to a stator manufacturing apparatus and a stator manufacturing method in which a stator core is constituted by divided cores divided for each tooth.

  Conventionally, as a stator of a brushless motor, a stator core having an annular portion and a plurality of teeth portions projecting radially inward from the annular portion, and coils each having a winding wound around each tooth portion There is. The stator core of such a stator includes, for example, a plurality of divided cores each having a divided annular portion having a shape obtained by dividing the annular portion in the circumferential direction and the teeth portion protruding from the divided annular portion. There is one in which the winding work is facilitated by winding a winding around a tooth portion before the ring is formed.

However, in the case where the stator core is composed of divided cores, each divided core must be arranged and fixed in an annular shape, so that the roundness of the stator core (stator) is higher than that of a stator core formed integrally with a plurality of teeth portions. There arises a problem that it is likely to cause a decrease in the quality of the image. Therefore, Patent Document 1 discloses a tapered ring having a tapered inner peripheral surface that increases in diameter as it goes upward, and a tapered inner peripheral surface that is arranged coaxially with the taper ring and increases in diameter as it goes downward. An apparatus for manufacturing a stator is disclosed that includes a tapered holder having a taper, and a split claw having a tapered outer peripheral surface in surface contact with each inner peripheral surface of the taper ring and the taper holder. The divided claw is configured by arranging a plurality of claw members in an annular shape, and each claw member is held by the taper holder so as to be relatively movable in the axial direction with respect to the taper holder. In this manufacturing apparatus, first, the split cores are arranged in a substantially annular shape in the taper ring, and the tape holder and the split claws are lowered so that the split cores are accommodated inside the split claws. Then, with each divided core housed inside the divided claw, the taper holder is moved downward relative to the divided claw so that the inner peripheral surface of the tapering and the taper holder and the outer peripheral surface of the divided claw slide. In addition, each claw member moves inward in the radial direction. Thereby, each divided core is uniformly pressurized along the circumferential direction, and each divided core is circularized with high accuracy.
JP 9-37522 A

  By the way, in Patent Document 1, a plurality of guide grooves extending in the radial direction and extending along the axial direction are formed in the taper holder, and each claw member is held on the taper holder by a guide bolt that can slide in the guide groove. Has been. Therefore, when performing maintenance such as removing dust adhering to the manufacturing apparatus, it is necessary to remove a number of guide bolts, disassemble each claw member and the taper holder, and reassemble these members, which is very laborious. It was complicated. Further, in the above configuration, since sliding occurs between the guide bolt and the guide groove in addition to the sliding between each claw member and the taper ring and the taper holder, the sliding resistance of the entire apparatus increases. As a result, the smooth movement of the claw member is hindered, and as a result, there is a possibility that the circularization accuracy of the split core is lowered.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stator manufacturing apparatus and a stator that can annularly divide a split core with high accuracy and can easily perform maintenance. It is in providing the manufacturing method of.

  In order to achieve the above object, the invention according to claim 1 is a stator core configured by arranging a plurality of divided cores each having a tooth portion in an annular shape so that a tip side of the tooth portion faces a radially inner side; A stator manufacturing apparatus including a plurality of coils wound respectively on the teeth portion, and includes a cylindrical operation jig and a pressure jig on which the operation jig is fitted, The pressurizing jig is inserted into each of the insertion holes so as to be movable in the radial direction, and a cylindrical holding member in which each of the divided cores is arranged on the inner peripheral side and a plurality of insertion holes penetrating in the radial direction is formed. A plurality of pressure pieces, and at least one of a radially outer side of the holding member in each of the pressure pieces and an inner periphery of the operation jig, and the outer periphery of the pressure jig. As the operating jig moves in the axial direction, And summarized in that a tapered surface is moved inward is formed.

  According to the above configuration, as the operating jig externally fitted to the pressing jig is pressed in the axial direction and moved in the axial direction, the holding member in each pressing piece radially outside and in the operating jig Each pressure piece moves radially inward by a tapered surface formed on at least one of the inner circumferences. Thereby, each division | segmentation core arrange | positioned at the inner peripheral side of a holding member is uniformly pressed along the circumferential direction, and each division | segmentation core can be circularized with high precision. In addition, since the operation jig is externally fitted to the pressurizing jig, unlike the conventional case where each claw member is provided on the taper holder by a guide bolt, each pressurizing piece is operated integrally with the holding member. It can be easily separated from the jig. Therefore, maintenance of the manufacturing apparatus can be easily performed. Furthermore, since each pressure piece is held by the holding member, each split core is made annular as compared to the case where the claw member (pressure piece) is assembled to the taper holder (operation jig) by a guide bolt as in the past. The sliding resistance at the time of performing can be reduced, and a decrease in the annular accuracy of the split core can be prevented.

The gist of the second aspect of the invention is that the stator manufacturing apparatus according to the first aspect further comprises a cylindrical inner member disposed on the inner peripheral side of each of the divided cores.
According to the above configuration, since the cylindrical inner mold member is provided on the inner peripheral side of each split core, the teeth are abutted against the inner mold member, so that each split core is further prevented from moving radially inward. Is done. For this reason, each of the split cores is pressed against each of the pressure pieces and abuts against the inner mold member, so that, for example, some of the split cores are prevented from moving radially inward from the other split cores. It is possible to prevent the circularity from decreasing.

  According to a third aspect of the present invention, in the stator manufacturing apparatus according to the first or second aspect, the operation jig is formed with a plurality of outer through holes extending in the radial direction and extending along the axial direction. The holding member is arranged on the same radial line as each of the outer through holes, and has a plurality of inner through holes that extend in the radial direction and extend in the axial direction.

  According to the said structure, the division | segmentation cores can be fixed in the state cyclic | annularized with high precision by welding the circumferential direction both ends of the division | segmentation core which adjoins via an outer side through-hole and an inner side through-hole. Therefore, for example, as in the prior art (see Patent Document 1), an engagement convex portion is formed on one side in the circumferential direction of the divided annular portion of each divided core and the engagement convex portion is engaged on the other circumferential side. By forming the joint recess and pressurizing each of the split cores arranged in an annular shape, the shape of the split core can be simplified as compared with the case where the engagement protrusion and the engagement recess are engaged. In addition, there exists a possibility that the fume (smoke containing oil) which generate | occur | produces by the influence of the oil etc. which remain | survive in a division | segmentation core may adhere to a jig | tool by welding. Therefore, the configuration in which the operation jig and the pressure jig can be easily separated as in claim 1 is particularly effective because it is difficult to reduce the work efficiency even if the frequency of maintenance is increased.

  According to a fourth aspect of the present invention, in the stator manufacturing apparatus according to any one of the first to third aspects, the pressurizing jig includes an annular member that can be elastically reduced in diameter. The pressure piece is fixed to the annular member and arranged in an annular shape, and the pressure pieces can be attached to and detached from the insertion holes integrally with the annular member by elastic deformation of the annular member. To do.

  According to the above configuration, since each pressure piece can be attached to and detached from the holding member in an integral state with the annular member by elastically deforming the annular member, each pressure piece and the holding member can be easily separated. It is possible to perform maintenance of the manufacturing apparatus more easily.

  According to a fifth aspect of the present invention, in the stator manufacturing apparatus according to any one of the first to fourth aspects, the operation jig is externally fitted to one axial end side of the pressure jig. A cylindrical first member and a cylindrical second member fitted on the other end in the axial direction of the pressure jig, and on the radially outer side of the holding member in each pressure piece The first outer taper surface and the second outer taper surface are formed such that the radial thickness of each pressure piece becomes thinner toward both ends in the axial direction, and the other end in the axial direction is formed on the inner periphery of the first member. A first inner tapered surface that increases in diameter toward the side is formed, and a second inner tapered surface that increases in diameter toward one end in the axial direction is formed on the inner periphery of the second member. And

  According to the above configuration, since the first and second members are respectively fitted on the pressure members, a force on the radially inner side acts on each pressure piece from both ends in the axial direction. Move radially inward in a state parallel to the direction. Therefore, a pressing force acts uniformly on each divided core along the axial direction, and each divided core can be circularized with higher accuracy.

  According to a sixth aspect of the present invention, in the stator manufacturing apparatus according to the fifth aspect, the divided cores are supported in the second member, and the axial directions of the divided cores and the second member are supported. The gist is that a positioning member for relative positioning in the circumferential direction is provided.

  According to the above configuration, since the positioning member is positioned in the axial direction and the circumferential direction with respect to the second member and each divided core is supported, each divided core can be easily arranged in the second member.

  According to a seventh aspect of the present invention, there is provided a stator core configured by arranging a plurality of split cores each having a tooth portion in an annular shape so that a distal end side of the tooth portion faces a radially inner side, and the tooth portion is wound around the stator core, respectively. And a pressing jig having a cylindrical holding member that holds a plurality of pressing pieces so as to be movable in a radial direction around each of the divided cores. An arrangement step to arrange, and a cylindrical operation jig externally fitted to the pressurizing jig are axially pressed and moved in the axial direction, so that the radially outer side of the holding member in each pressurizing piece and A gist is provided with a pressing step of moving each pressing piece radially inward by a tapered surface formed on at least one of the inner circumferences of the operation jig. According to the said structure, there can exist an effect similar to the effect of Claim 1.

  The invention according to claim 8 is the method for manufacturing a stator according to claim 7, wherein the stator core is pressurized in the pressurizing step and passes through the operation jigs in the radial direction, respectively, in the axial direction. A plurality of outer through-holes formed along the outer circumferential holes, and a plurality of inner through-holes that are arranged on the same radial line as the outer through-holes and that penetrate the holding member in the radial direction and are formed along the axial direction. The gist of the invention is that it includes a welding step of welding the divided cores through holes. According to the said structure, there can exist an effect similar to the effect of Claim 3.

  According to the present invention, it is possible to provide a stator manufacturing apparatus and a stator manufacturing method that can annularly divide a split core with high accuracy and can easily perform maintenance.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
First, before describing the stator manufacturing apparatus and manufacturing method of the present embodiment, a brushless motor including a stator manufactured by the manufacturing apparatus and manufacturing method will be described.

  As shown in FIGS. 1A and 1B, the housing 2 of the brushless motor 1 is formed in a bottomed cylindrical shape, and a substantially cylindrical stator 3 is fixed to the inner peripheral surface thereof. Inside the stator 3, a rotor 5 is rotatably arranged via a bearing 4 provided at the bottom center of the housing 2. In addition, a cylindrical rotor core 7 is fixed to the rotating shaft 6 constituting the rotor 5, and the outer peripheral surface of the rotor core 7 is magnetized with different polarities (N pole, S pole) at predetermined angles. A magnet 8 is fixed. A holder 9 made of an insulating synthetic resin material is fixed to the end of the housing 3 on the opening side of the stator 3, and the holder 9 covers one end in the axial direction of the stator 3. .

  As shown in FIGS. 2A and 2B, the stator core 10 constituting the stator 3 has an annular shape by connecting twelve divided cores 11 having a T-shape when viewed from the axial direction in the circumferential direction. It is configured. Each divided core 11 includes a divided annular portion 12 having an arc shape when viewed from the axial direction, and a tooth portion 13 extending radially inward from the circumferential central portion of the divided annular portion 12. In the present embodiment, the divided cores 11 are fixed by laser welding at both circumferential ends of the divided annular portion 12. Each divided core 11 is provided with a bobbin 14 that covers both end surfaces in the axial direction and both side surfaces in the circumferential direction of each divided core 11 from both sides in the axial direction. And the coil 16 is each wound by the teeth part 13 by winding the coil | winding 15 several times by concentrated winding from on the bobbin 14. FIG.

  As shown in FIG. 1A, the connection end 16 a of each coil 16 is pulled out to the surface of the holder 9 opposite to the stator 3 and arranged on the surface of the holder 9 opposite to the stator 3. Each of the terminals 17 is connected to a plurality (four in this embodiment) of terminals 17. In the brushless motor 1 configured as described above, a three-phase excitation current is supplied from a driving power source (not shown) through each terminal 17 (in this embodiment, three arranged on the upper side in FIG. 1A). When supplied to each coil 16, each coil 16 is excited to generate a rotating magnetic field in the stator 3, and the rotor 5 is rotated based on the rotating magnetic field.

Next, the manufacturing apparatus 21 for manufacturing the stator 3 provided in the brushless motor 1 will be described.
As shown in FIG. 3, the manufacturing apparatus 21 includes a cylindrical operation jig 22 and a pressure jig 23 to which the operation jig 22 is fitted. In the present embodiment, the operation jig 22 includes an upper member 31 as a first member and a lower member 32 as a second member disposed coaxially with the upper member 31.

  More specifically, as shown in FIGS. 4A and 4B, the upper member 31 is formed in a bottomed cylindrical shape, and the inner periphery thereof has an axially lower side (the other end side in the axial direction). The 1st inner side taper surface 33 which diameter-expands as it goes to is formed. The cylindrical portion 34 of the upper member 31 penetrates in the radial direction and the lower side in the axial direction, and 12 first outer through holes 35 along the axial direction are formed at equal intervals along the circumferential direction. Has been. Further, a knockout bolt 37 is provided on the upper bottom 36 of the upper member 31 so as to protrude on the side opposite to the axially open end (upper side in FIG. 4A).

  On the other hand, as shown in FIGS. 4C and 4D, the lower member 32 is formed in a cylindrical shape having the same diameter as the upper member 31, and has an axial upper side (one axial end) on the inner periphery thereof. A second inner tapered surface 41 is formed which increases in diameter toward the side. The cylindrical portion 34 of the lower member 32 penetrates in the radial direction and the upper side in the axial direction, and 12 second outer through holes 42 along the axial direction are formed at equal intervals in the circumferential direction. Has been. Further, an installation hole 44 penetrating in the axial direction is formed at the center of the lower bottom 43 of the lower member 32. In the present embodiment, the first outer through hole 35 and the second outer through hole 42 constitute an outer through hole.

  As shown in FIGS. 5A and 5B, the pressurizing jig 23 includes a substantially cylindrical holding member 51 and a plurality of holding members 51 arranged in an annular shape and held by the holding member 51 so as to be movable in the radial direction. And a pressure piece 52. Specifically, as shown in FIG. 6, a plurality of insertion holes 54 penetrating in the radial direction and extending along the axial direction are formed in the side wall 53 of the holding member 51 at equal intervals in the circumferential direction. In addition, a plurality of inner through holes 55 penetrating in the radial direction and extending in the axial direction are formed between the insertion holes 54 in the side wall 53. Each inner through hole 55 is the same as each first outer through hole 35 and each second outer through hole 42 in a state where the upper member 31 and the lower member 32 are externally fitted to both ends of the pressing jig 23 in the axial direction. It is formed so that arrangement | positioning is possible on a radial direction line | wire. The outer diameter of the holding member 51 is smaller than the inner diameter at the upper end of the inner periphery of the upper member 31 and the inner diameter at the lower end of the inner periphery of the lower member 32.

  As shown in FIGS. 7A and 7B, the pressure pieces 52 are formed in a substantially quadrangular prism shape, and each pressure piece 52 is inserted in each insertion hole 54 so as to be movable in the radial direction. It has become so. On the radially outer side of the holding member 51 in each pressing piece 52, that is, on the radially outer side (right side in FIG. 7) in a state where each pressing piece 52 is arranged in an annular shape, from the approximate center to both ends in the axial direction. A first outer tapered surface 56 and a second outer tapered surface 57 are formed, whose thickness in the radial direction becomes thinner as they go. In the present embodiment, the first outer tapered surface 56 is in surface contact with the first inner tapered surface 33, and the second outer tapered surface 57 is in surface contact with the second inner tapered surface 41. Further, an inner curved surface 58 corresponding to the curvature of the outer periphery of the stator 3 (stator core 10) is formed on the radially inner side (left side in FIG. 7) of the holding member 51 in the pressing piece 52. Further, step portions 59 are formed on both ends of the inner curved surface 58 in the axial direction so that the radial thickness of the pressure piece 52 is thinner than the axial center. In the present embodiment, the first and second inner tapered surfaces 33 and 41 and the first and second outer tapered surfaces 56 and 57 constitute a tapered surface.

  In this embodiment, as shown in FIG. 3, the pressurizing jig 23 includes an annular member 61 that can be elastically contracted, and each pressurizing piece 52 is fixed to the annular member 61 at both axial ends thereof. The holding member 51 is annularly arranged. Specifically, as shown in FIGS. 8A and 8B, the annular member 61 is formed in an annular shape having an abutment portion 62, and a screw hole 63 penetrating in the radial direction is provided along the circumferential direction. It is formed at equal intervals. The annular member 61 is made of a thin metal plate material. Each annular member 61 is disposed in a stepped portion 59 of each pressure piece 52 and is fixed to each pressure piece 52 with a screw (not shown). Further, the circumferential length of the abutment portion 62 is formed to be substantially equal to the interval between the adjacent pressing pieces 52 held by the holding member 51. Each pressure piece 52 can be attached to and detached from each insertion hole 54 of the holding member 51 while being integrated with each annular member 61 by elastic deformation of each annular member 61. In the state where each annular member 61 is not elastically reduced in diameter, the outer diameter defined at both axial ends of each pressing piece 52 is the inner diameter at the lower end (opening end) and the lower side at the inner periphery of the upper member 31. The inner diameter at the upper end (opening end) of the inner periphery of the member 32 is smaller than the inner diameter at the upper end of the inner periphery of the upper member 31 and the inner diameter at the lower end of the inner periphery of the lower member 32.

  Furthermore, as shown in FIG. 9, the manufacturing apparatus 21 includes a core bar 71 installed in the installation hole 44 of the lower member 32. Specifically, the cored bar 71 includes a pedestal portion 72 fitted into the installation hole 44, and an inner mold portion 74 as an inner mold member provided on the pedestal portion 72 via a connecting portion 73. The inner mold part 74 is formed in a columnar shape having substantially the same diameter as the inner diameter of the stator core 10, and the tips of the tooth parts 13 of the pressed divided cores 11 come into contact with each other. In addition, the cored bar 71 is provided with a plurality of (three in the present embodiment) positioning members 75 that protrude from the upper end of the pedestal 72 in the axial direction at equal intervals in the circumferential direction. ing. At least one tip of each positioning portion 75 is formed with an engaging convex portion 75a. Here, the above-described bobbin 14 is formed with engagement concave portions (not shown) corresponding to the engagement convex portions 75a of the positioning portions 75. Then, when each divided core 11 before pressurization arranged in a substantially annular shape is inserted into the inner mold portion 74, the engaging convex portion 75 a of the positioning portion 75 is engaged with the engaging concave portion, and Positioning in the circumferential direction relative to the lower member 32 is performed, and positioning in the axial direction is supported by each positioning portion 75. Specifically, in a state in which each of the divided cores 11 arranged in a substantially annular shape is supported by the positioning portion 75, both circumferential ends of each divided core 11, that is, both circumferential ends of the divided core 11 in the stator core 10 are the first outer side. It is exposed from the through hole 35, the second outer through hole 42 and the inner through hole 55.

Next, the manufacturing method of the stator 3 provided in the brushless motor 1 will be described focusing on the annular formation of each divided core 11 and its fixing.
First, as shown in FIGS. 10A and 10B, a cored bar 71 is installed on the lower member 32 (see FIG. 9), and each division in a state in which the winding 15 is wound around each tooth portion 13 is performed. The core 11 is formed in a substantially annular shape, and the inner mold portion 74 is disposed on the inner peripheral side thereof, so that the divided cores 11 are supported by the positioning portion 75. In the arranging step, the pressing jig 23 is arranged around each divided core 11 supported by the positioning portion 75. The pressurizing jig 23 is arranged so that the circumferential position of each inner through hole 55 of the holding member 51 and the circumferential position of each second outer through hole 42 of the lower member 32 coincide with each other. Mounted on the second inner tapered surface 41 of the member 32. At this time, each pressurizing piece 52 is located at the approximate center in the circumferential direction of each divided annular portion 12.

  Next, in the pressurizing step, as shown in FIG. 3, the upper member 31 is added so that the circumferential position of each first outer through hole 35 and the circumferential position of each second outer through hole 42 coincide. Cover the pressure jig 23 from above. Then, the upper member 31 is pressed downward by the pressing device (not shown) so as to be close to the lower member 32, that is, the upper member 31 and the lower member 32 (operation jig 22) are pressed against the pressure jig 23. To move in the axial direction. Accordingly, the first inner tapered surface 33 of the upper member 31 and the first outer tapered surface 56 of the pressure piece 52, and the second inner tapered surface 41 of the lower member 32 and the second outer tapered surface 57 of the pressure piece 52. And the force on the radial center side acts on each pressing piece 52 from the upper member 31 and the lower member 32, respectively. Then, as shown in FIG. 11, the annular member 61 is elastically reduced in diameter, and each pressing piece 52 is moved in the radial direction to press each divided core 11. By doing in this way, each division | segmentation core 11 is uniformly pressed along the circumferential direction by each pressurization piece 52, and each division | segmentation core 11 is cyclic | annularized with high precision.

  Subsequently, in the welding process, both circumferential ends of the split core 11 exposed to the outside from the first outer through holes 35, the second outer through holes 42, and the inner through holes 55 are fixed by laser welding. Thereby, each divided core 11 is fixed in a state of being annularized with high accuracy, and the stator 3 is manufactured. After the welding process, for example, an operator holds the knockout bolt 37, removes the upper member 31, and takes out the stator 3.

As described above, according to the present embodiment, the following effects can be obtained.
(1) The manufacturing apparatus 21 includes a cylindrical operation jig 22 and a pressure jig 23 to which the operation jig 22 is fitted. The pressing jig 23 has a cylindrical holding member 51 in which each divided core 11 is disposed on the inner peripheral side and a plurality of insertion holes 54 penetrating in the radial direction are formed, and the insertion holes 54 are moved in the radial direction. And a plurality of pressurizing pieces 52 inserted in a possible manner. Then, the operation jig 22 fitted on the pressure jig 23 is fitted to the outer side in the radial direction of the holding member 51 and the inner periphery of the operation jig 22 (the upper member 31 and the lower member 32) in each pressure piece 52. The first and second inner tapered surfaces 33 and 41 and the first and second outer tapered surfaces 56 and 57 that move the pressure pieces 52 inward in the radial direction in accordance with the axial movement are formed. Therefore, when the operating jig 22 fitted on the pressurizing jig 23 is pressed in the axial direction and moved in the axial direction, each pressurizing piece 52 moves inward in the radial direction. Thereby, each division | segmentation core 11 arrange | positioned at the inner peripheral side of the holding member 51 is pressed uniformly along the circumferential direction, and each division | segmentation core 11 can be cyclic | annularized with high precision. Further, since the operation jig 22 is externally fitted to the pressurizing jig 23, each pressurizing piece 52 together with the holding member 51 is different from the conventional case where the split claw is provided on the taper holder by the guide bolt. It can be easily separated from the operation jig 22. Therefore, maintenance of the manufacturing apparatus 21, particularly removal of dust between the first and second inner tapered surfaces 33 and 41 and the first and second outer tapered surfaces 56 and 57, which are likely to generate wear powder due to sliding, is performed. It can be done easily. Furthermore, since each pressing piece 52 is held by the holding member 51, each divided core 11 is compared with the case where the dividing claw (pressing piece) is assembled to the taper holder (operation jig) by a guide bolt as in the prior art. The sliding resistance at the time of circularization can be reduced, and the decrease in the circularization accuracy of the split core 11 can be prevented.

  (2) Since the cylindrical inner mold portion 74 is provided on the inner peripheral side of each divided core 11, each divided core 11 moves further inward in the radial direction by the teeth portion 13 coming into contact with the inner mold portion 74. Be regulated. For this reason, each of the split cores 11 is abutted against the inner mold portion 74 by being pressed by each of the pressure pieces 52, and for example, some of the split cores 11 are prevented from moving radially inward from the other split cores 11. Thus, it is possible to prevent the roundness of the stator 3 from being lowered.

  (3) The holding jig 51 (the upper member 31 and the lower member 32) is formed with a plurality of first and second outer through holes 35 and 42 that extend in the radial direction and extend in the axial direction. In addition, a plurality of inner through-holes 55 extending in the radial direction and extending along the axial direction are formed so as to be arranged on the same radial line as the first and second outer through-holes 35 and 42. And the circumferential direction both ends of the division | segmentation core 11 which adjoins via the 1st and 2nd outer side through-holes 35 and 42 and the inner side through-hole 55 are laser-welded, and the division | segmentation cores 11 were fixed in the state cyclic | annularized highly accurately. . Therefore, for example, as in the prior art, an engagement convex portion is formed on one side in the circumferential direction of the divided annular portion of each divided core and an engagement concave portion that engages with the engagement convex portion on the other side in the circumferential direction, By pressurizing each of the split cores arranged in an annular shape, the shape of the split core 11 can be simplified as compared with the case where the engaging convex portion and the engaging concave portion are engaged. By welding, there is a risk that fumes (smoke containing oil) generated due to the oil remaining in the split core 11 adhere to the jig. In this respect, in this embodiment, since the operation jig 22 and the pressure jig 23 can be easily separated, it is difficult to reduce the work efficiency even if the frequency of maintenance is increased, and the adverse effects of welding are minimized. To the limit.

  (4) The pressing jig 23 includes an annular member 61 that can be elastically reduced in diameter, and each pressing piece 52 is fixed to the annular member 61 and arranged annularly. Each pressure piece 52 is made detachable from each insertion hole 54 integrally with the annular member 61 by elastic deformation of the annular member 61. Since each pressing piece 52 can be attached to and detached from the holding member 51 in a state of being integrated with the annular member 61, each pressing piece 52 and the holding member 51 can be easily separated, and maintenance of the manufacturing apparatus 21 can be performed. In particular, it is possible to more easily remove dust between the holding member 51 and each pressure piece 52.

  (5) A cylindrical upper member 31 that is externally fitted to the upper side of the pressing jig 23 in the axial direction and a cylindrical lower part that is externally fitted to the lower side of the pressing jig 23 in the axial direction. The side member 32 is configured. In addition, the first outer tapered surface 56 and the second outer tapered surface 57 in which the radial thickness of each pressing piece 52 becomes thinner toward the both ends in the axial direction toward the radially outer side of the holding member 51 in each pressing piece 52. Formed. Further, a first inner tapered surface 33 that increases in diameter toward the lower side in the axial direction is formed on the inner periphery of the upper member 31, and a first diameter that increases in diameter toward the upper side in the axial direction is formed on the inner periphery of the lower member 32. 2 The inner tapered surface 41 was formed. For this reason, since the upper member 31 and the lower member 32 are externally fitted to the pressurizing jig 23, a force on the inner side in the radial direction acts on each pressurizing piece 52 from both ends in the axial direction. The pressure piece 52 moves radially inward in a state parallel to the axial direction. Therefore, a pressing force acts uniformly on each divided core 11 along the axial direction, and each divided core 11 can be circularized with higher accuracy.

  (6) A positioning unit that supports each of the divided cores 11 arranged in a substantially annular shape in the lower member 32 and relatively positions the divided cores 11 and the lower member 32 in the axial direction and the circumferential direction. A mandrel 71 having 75 is provided. For this reason, the positioning core 75 is positioned in the axial direction and the circumferential direction with respect to the lower member 32 to support each divided core 11, so that each divided core 11 can be easily disposed in the lower member 32.

  (7) Since the first outer tapered surface 56 is in surface contact with the first inner tapered surface 33 and the second outer tapered surface 57 is in surface contact with the second inner tapered surface 41, the upper member 31 and the lower member 32 and the pressure applied to each taper surface of each pressure piece 52 can be reduced, and the durability of these members can be improved.

In addition, you may implement each said embodiment in the following aspects.
In the above embodiment, the insertion hole 54 of the holding member 51 is formed along the axial direction. However, the present invention is not limited to this. For example, the insertion hole is formed so as to be inclined in the circumferential direction along the axial direction. The pressure piece may be shaped to match the insertion hole.

-In above-mentioned embodiment, although each division | segmentation core 11 was fixed by laser welding, you may fix each division | segmentation core 11 not only by this but by other weldings, such as arc welding.
In the above embodiment, the annular member 61 is formed of a thin metal material and is formed in an annular shape having the abutment portion 62. However, the present invention is not limited to this. For example, the annular member 61 is configured by an elastic member such as rubber. You may form in an annular | circular shape.

  In the above embodiment, the first outer tapered surface 56 is in surface contact with the first inner tapered surface 33 and the second outer tapered surface 57 is in surface contact with the second inner tapered surface 41. It is not necessary to make surface contact.

  In the above embodiment, the first outer taper surface 56 and the second outer taper surface 57 are formed on each pressure piece 52, the first inner taper surface 33 is formed on the upper member 31, and the second inner taper is formed on the lower member 32. A surface 41 was formed. However, the present invention is not limited thereto, and the inner peripheral surfaces of the upper member and the lower member are formed parallel to the axial direction, the first outer tapered surface 56 is in contact with the lower end of the upper member, and the second outer tapered surface 57 is the lower side. You may make it contact the upper end of a member linearly. Further, the radially outer surface of each pressure piece is formed in parallel with the axial direction, the upper end of each pressure piece is in contact with the first inner tapered surface 33 of the upper member 31, and the lower end of each pressure piece is the lower side. You may make it contact the 2nd inner side taper surface 41 of the member 32. FIG.

  In the above embodiment, the operation jig 22 is configured by the upper member 31 and the lower member 32. However, the present invention is not limited thereto, and only the jig having the first inner tapered surface 33 that is longer in the axial direction than the upper member 31. Alternatively, the operation jig 22 may be configured. In this case, it is preferable to form only the first outer tapered surface 56 on the radially outer side of the pressure piece 52.

In the above embodiment, the installation hole 44 penetrating in the axial direction is formed in the lower member 32. However, the present invention is not limited to this, and a recess may be formed instead of the installation hole 44 and the cored bar 71 may be provided in the recess. Good.
In the above-described embodiment, the core member 71 is provided on the lower member 32. However, the present invention is not limited to this, and the lower member 32 is formed in a bottomed cylindrical shape, and each divided core 11 disposed in a substantially annular shape is disposed below the core member 71. You may make it mount in a bottom part.

  In the above embodiment, the first inner tapered surface 33, the second inner tapered surface 41, the first outer tapered surface 56, and the second outer tapered surface 57 are formed in a tapered shape with a constant gradient along the axial direction. However, the present invention is not limited to this, and it may be formed in a tapered shape whose gradient changes along the axial direction.

  -In above-mentioned embodiment, although each split core 11 was fixed by laser welding, it is not restricted to this. For example, an engaging convex portion is formed on one side in the circumferential direction of the divided annular portion 12 of each divided core 11, and an engaging concave portion that engages with the engaging convex portion is formed on the other circumferential side, and arranged in an annular shape. By pressurizing each divided core 11 in a pressurizing step, the engagement convex portion and the engagement concave portion may be engaged with each other to fix the respective divided cores. By configuring each divided core in this way, the stator 3 can be manufactured without going through a welding process.

(A) The top view of a brushless motor, (b) AA sectional view taken on the line in Fig.1 (a). (A) The top view which looked at the stator from the holder side, (b) The BB sectional drawing in FIG.2 (b). The partial cross section figure which looked at the manufacturing apparatus in the state where the stator was arranged inside from the front. (A) The partial sectional view which looked at the upper member from the front, (b) The bottom view of the upper member, (c) The top view of the lower member, (d) The partial sectional view which looked at the lower member from the front. (A) The top view of a pressurization jig, (b) The partial sectional view which looked at the pressurization jig from the front. The partial sectional view which looked at the holding member from the front. (A) Top view of a pressure piece, (b) Side view of a pressure piece. (A) Top view of annular member, (b) Front view of annular member. The partial sectional view which looked at the lower member provided with the metal core from the front. (A) The top view of the lower member in the state where each divided core is supported by the alignment part, (b) The partial cross section which looked at the lower member in the state where each divided core was supported by the alignment part from the front Figure. The partial cross section figure which looked at the manufacturing apparatus of the state which pressed each division | segmentation core from the front.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Stator, 10 ... Stator core, 11 ... Divided core, 13 ... Teeth part, 16 ... Coil, 21 ... Manufacturing apparatus, 22 ... Operation jig, 23 ... Pressing jig, 31 ... Upper member, 32 ... Lower member 33 ... first inner tapered surface, 35 ... first outer through hole, 41 ... second inner tapered surface, 42 ... second outer through hole, 51 ... holding member, 52 ... pressure piece, 54 ... insertion hole, 55 ... inner through hole, 56 ... first outer tapered surface, 57 ... second outer tapered surface, 61 ... annular member, 74 ... inner mold part, 75 ... positioning part.

Claims (8)

A stator core configured by arranging a plurality of divided cores each having a tooth portion in an annular shape so that a distal end side of the tooth portion faces radially inward, and a plurality of coils wound around the tooth portions, respectively. A stator manufacturing apparatus,
A cylindrical operation jig,
A pressure jig on which the operation jig is fitted,
The pressurizing jig includes a cylindrical holding member in which each of the divided cores is disposed on the inner peripheral side and a plurality of insertion holes penetrating in the radial direction is formed, and the insertion holes are movable in the radial direction. With a plurality of inserted pressure pieces,
At least one of the radially outer side of the holding member and the inner periphery of the operation jig in each of the pressure pieces, each of the operation jigs fitted on the pressure jig is moved in the axial direction as the operation jigs are axially moved. An apparatus for manufacturing a stator, wherein a taper surface for moving a pressure piece radially inward is formed.   The stator manufacturing apparatus according to claim 1, further comprising a cylindrical inner member disposed on an inner peripheral side of each of the divided cores. The operation jig is formed with a plurality of outer through holes extending in the radial direction and extending in the radial direction,
2. The holding member is disposed on the same radial line as each of the outer through holes, and has a plurality of inner through holes penetrating in the radial direction and extending along the axial direction. Or the stator manufacturing apparatus according to 2. The pressurizing jig includes an annular member capable of elastic contraction,
Each of the pressure pieces is fixed to the annular member and arranged in an annular shape,
The stator according to any one of claims 1 to 3, wherein the pressure pieces are detachable from the insertion holes integrally with the annular member by elastic deformation of the annular member. manufacturing device. The operation jig includes a cylindrical first member that is fitted on one end side in the axial direction of the pressure jig, and a second cylindrical member that is fitted on the other end side in the axial direction of the pressure jig. Consisting of parts,
A first outer taper surface and a second outer taper surface are formed on the radially outer sides of the holding members in the respective pressure pieces, and the thicknesses of the pressure pieces in the radial direction become thinner toward both ends in the axial direction. ,
A first inner tapered surface that increases in diameter toward the other end in the axial direction is formed on the inner periphery of the first member, and expands toward the one end in the axial direction on the inner periphery of the second member. The stator manufacturing apparatus according to any one of claims 1 to 4, wherein a second inner tapered surface is formed.   The second member is provided with a positioning member that supports the divided cores and relatively positions the divided cores and the second member in the axial direction and the circumferential direction. The stator manufacturing apparatus according to claim 5. A stator core configured by arranging a plurality of divided cores each having a tooth portion in an annular shape so that a distal end side of the tooth portion faces radially inward, and a plurality of coils wound around the tooth portions, respectively. A method for manufacturing a stator, comprising:
An arrangement step of arranging a pressure jig having a cylindrical holding member that holds a plurality of pressure pieces in a radially movable manner around each of the divided cores;
By pressing the cylindrical operation jig externally fitted to the pressure jig in the axial direction and moving in the axial direction, the holding member in the pressure piece in the radial direction outside and the operation jig in the operation jig A stator manufacturing method comprising: a pressing step of moving each pressing piece radially inward by a tapered surface formed on at least one of the circumferences.   In the state where the stator core is pressurized in the pressurizing step, a plurality of outer through holes formed in the operation jig in the radial direction and formed along the axial direction, and the same diameter as the outer through holes. And a welding step of welding each of the divided cores via a plurality of inner through-holes that are arranged on a direction line and penetrate the holding member in the radial direction and are formed along the axial direction. The stator manufacturing method according to claim 7.

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