JP2010098828A - Method and apparatus for manufacturing stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing a stator wherein it is possible to annularly arrange split cores with accuracy and facilitate maintenance. <P>SOLUTION: Split cores 11 are annularly arranged on the outer circumference side of core metal 23 and an annular jig 22 is placed on the outer circumference side of the split cores 11 so that the entire split cores 11 are covered therewith. The outer tapered surface 25a of a shaft 25 and the inner tapered surfaces 24a of pressure tabs 24 are slid against each other by moving the shaft 25 upward in the axial direction. As a result, each pressure tab 24 is pressed outward in the radial direction and each split core 11 is moved outward in the radial direction by each pressure tab 24. Each split core 11, moved outward in the radial direction, is brought into contact with the inner circumferential surface 22d of the annular jig 22 and its outward movement in the radial direction is thereby arrested. At the same time, each split core is sandwiched between the inner circumferential surface 22d of the annular jig 22 and the outer circumferential surface 24d of each pressure tab 24. As a result, the split cores 11 are evenly pressed along the circumferential direction and annularly arranged with accuracy. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

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

  Conventionally, a stator of a brushless motor includes a stator core having an annular portion and a plurality of tooth portions projecting radially inward from the annular portion, and coils each having a winding wound around each tooth portion. is there. 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 annularly arranged in the taper ring, and the taper 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 division | segmentation core is uniformly pressurized along the circumferential direction, and this division | segmentation core is circularized with high precision.
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 An object of the present invention is to provide a stator manufacturing method and a stator manufacturing apparatus that can annularly split a split core with high accuracy and can easily perform maintenance.

  In order to achieve the above object, the invention according to claim 1 is a method for manufacturing a stator in which a stator core is constituted by a plurality of divided cores, on the outer peripheral side of the first member that can be expanded and contracted in the radial direction. A first arrangement step of arranging the divided cores in an annular shape, and a second arrangement of arranging a cylindrical second member that restricts the radially outward movement of the divided cores on the outer peripheral side of the divided cores. And pressurizing the split core by pressing the split core and moving the split core outward in the radial direction by bringing the diameter of the first member into contact with the inner peripheral surface of the second member. The gist is to include a process and a joining process for joining the divided cores after the pressurizing process.

  According to this invention, after the first placement step and the second placement step are performed, the split core moves radially outward in the pressurizing step, and the outer peripheral surface of each split core is the second Contact the inner peripheral surface of the member. Accordingly, each divided core is sandwiched between the inner peripheral surface of the second member and the outer peripheral surface of the first member, and is uniformly pressed along the circumferential direction. That is, the split cores are restricted from moving further radially inward or radially outward, and for example, some split cores may move radially inward or radially outward relative to other split cores. The split core can be annularized with high accuracy. And a highly accurate stator can be manufactured by joining the split cores annularized with high precision in a joining process. Further, since the second member is arranged on the outer peripheral side of the split core, unlike the case where each claw member is assembled to the taper holder by the guide bolt as in the prior art, the second member can be easily removed. It becomes possible. Therefore, maintenance of the second member can be easily performed, and maintenance of the first member can be performed by removing the second member and further removing the split core.

The gist of the invention according to claim 2 is that, in the invention according to claim 1, the first arranging step is performed by reducing the diameter of the first member from the inner diameter of the divided core. .
According to this invention, when the first arrangement step is performed, the first member has a smaller diameter than the inner diameter of the divided core, so that the divided core is arranged annularly on the outer peripheral side of the first member. It becomes easy.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the first member includes a shaft and a plurality of members arranged on an outer peripheral side of the shaft and capable of expanding and contracting in the radial direction. A pressure piece, and an inner peripheral surface of the pressure piece is an inner tapered surface that increases in diameter toward one end side in the axial direction, and an outer peripheral surface of the shaft is one end side in the axial direction. The pressure increasing step presses the pressure piece by sliding the inner tapered surface and the outer tapered surface by the movement of the shaft, The gist of the present invention is that the pressing is performed by pressing the split core by moving the pressing piece radially outward.

  According to this invention, the pressure piece is pressed by sliding the inner tapered surface of the pressure piece and the outer tapered surface of the shaft by the movement of the shaft, and the pressure piece is moved radially outward. Therefore, the pressure piece moved outward in the radial direction presses the split core and moves it outward in the radial direction. Therefore, a pressing force acts uniformly on each divided core along the radially outer side and the circumferential direction, and each divided core can be annularized with higher accuracy.

The gist of the invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the joining step is a welding step of welding the divided cores.
According to this invention, it is possible to fix the split cores in an annular state with high precision by welding both circumferential surfaces of adjacent split cores. 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.

  The invention according to claim 5 is the invention according to claim 4, wherein the second member is formed with an outer through hole extending in the radial direction and extending in the radial direction, and the welding step includes The gist is that the outer through hole formed in the second member is arranged through the outer through hole in a state where the outer through hole is arranged corresponding to the joint portion between the divided cores.

  According to this invention, even if it is in the state where the second member is arranged so as to cover the entire divided core, the adjacent divided cores via the outer through holes corresponding to the positions of the joints between the divided cores. Both circumferential surfaces can be welded.

  The invention according to claim 6 is a stator manufacturing apparatus in which a stator core is configured by a plurality of divided cores, and is arranged on the inner peripheral side of the divided cores, and can be expanded and contracted in the radial direction, and the diameter of the expanded cores. A first member having a pressing surface that presses the inner peripheral surface of the split core at the time, and a cylindrical shape that is disposed on the outer peripheral side of the split core and restricts movement of the split core radially outward With the second member and the first member disposed on the inner peripheral side of the split core and the second member disposed on the outer peripheral side of the split core, the first member is The gist of the present invention is that it is provided with a motion imparting means for expanding the diameter.

  According to the present invention, the first member is expanded in diameter by the action applying means, the split core is pressed by the pressing surface of the first member, and moved radially outward, and the outer peripheral surface of each split core is It contacts the inner peripheral surface of the second member. Accordingly, each divided core is sandwiched between the inner peripheral surface of the second member and the outer peripheral surface of the first member, and is uniformly pressed along the circumferential direction. That is, the split cores are restricted from moving further radially inward or radially outward, and for example, some split cores may move radially inward or radially outward relative to other split cores. The split core can be annularized with high accuracy. Further, since the second member is arranged on the outer peripheral side of the split core, unlike the case where each claw member is assembled to the taper holder by the guide bolt as in the prior art, the second member can be easily removed. It becomes possible. Therefore, maintenance of the second member can be easily performed, and maintenance of the first member can be performed by removing the second member and further removing the split core.

  The invention according to claim 7 is the invention according to claim 6, wherein the first member is a shaft, and a plurality of pressure pieces that are arranged on an outer peripheral side of the shaft and are expandable and contractable in a radial direction. The inner peripheral surface of the pressure piece is an inner tapered surface that increases in diameter toward the one end side in the axial direction, and the outer peripheral surface of the shaft expands toward the one end side in the axial direction. The first member is slid by the movement of the shaft to slide the outer taper surface and the inner taper surface by the movement imparting means. The gist is to press the divided core by moving the pressure piece radially outward by the diameter expansion operation.

  According to this invention, the pressure piece is pressed by sliding the inner tapered surface of the pressure piece and the outer tapered surface of the shaft by the movement of the shaft, and the pressure piece is moved radially outward. Therefore, the pressure piece moved outward in the radial direction presses the split core and moves it outward in the radial direction. Therefore, a pressing force acts uniformly on each divided core along the radially outer side and the circumferential direction, and each divided core can be annularized with higher accuracy.

  The invention according to an eighth aspect is the invention according to the seventh aspect, wherein the plurality of pressurizing pieces are mounted in a state of being annularly arranged with respect to the shaft by an annular member that can be elastically expanded and contracted in a radial direction. The gist is that

  According to this invention, a plurality of pressurization pieces can be put together by attaching a plurality of pressurization pieces with respect to a shaft by an annular member. Even if the pressure piece is pressed by sliding the inner taper surface of the pressure piece and the outer taper surface of the shaft by the movement of the shaft, the annular member can be elastically expanded and contracted in the radial direction. The piece can move in the radial direction while being mounted on the shaft.

  The invention according to claim 9 is the invention according to any one of claims 6 to 8, wherein when the second member is disposed on the outer peripheral side of the split core, the split cores are arranged together. The gist of the present invention is that an outer through-hole is formed at a position corresponding to the joint portion in the radial direction while penetrating the second member in the radial direction.

  According to this invention, the circumferentially both surfaces of the adjacent split cores are welded via the outer through holes corresponding to the positions of the joints between the split cores, so that the split cores are fixed in a highly annularized state. can do. 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.

  According to the present invention, the split core can be circularized with high accuracy, and maintenance can be easily performed.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
First, before describing the manufacturing method and manufacturing apparatus of the stator according to the present embodiment, a brushless motor including a stator manufactured by the manufacturing method and manufacturing apparatus 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. Each divided core 11 is formed by laminating a plurality of (for example, several tens) electromagnetic steel sheets in the axial direction of the divided core 11, and the electromagnetic steel sheets are caulked in the axial direction and integrated. 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. 7, the manufacturing apparatus 21 includes a cored bar 23 as a columnar first member and an annular jig 22 as a cylindrical second member.

  As shown in FIG. 3A, the inner peripheral surface 22d of the annular jig 22 is formed with an inner tapered surface 22a whose diameter increases toward the lower side in the axial direction. Further, as shown in FIGS. 3A and 3B, on the side surface of the annular jig 22, there are twelve outer through holes 22b extending in the radial direction and along the lower side in the axial direction along the circumferential direction. Are formed at equal intervals. In addition, a positioning recess 22c having a circular shape when viewed from the end surface is formed at the edge of the annular jig 22 on the lower end surface in the axial direction.

  As shown in FIG. 4, the cored bar 23 has a rod shape in which the lower side in the axial direction has the same diameter, the upper side in the axial direction has a substantially conical shape, and the diameter of the shaft 25 decreases toward the upper side in the axial direction. It is comprised from the pressure nail | claw 24 as a divided | segmented pressure piece.

  The lower side in the axial direction of the shaft 25 is accommodated in the cored bar base 31, and the upper side in the axial direction of the shaft 25 is exposed from the cored bar base 31 through a cored bar holder 32 attached to the upper surface of the cored bar base 31. Has been. In addition, a spring 33 for urging the shaft 25 downward in the axial direction is accommodated in the metal core base 31. The upper end of the spring 33 is in contact with the lower surface of the metal core holder 32, and the lower end of the spring 33 is in contact with a spring stopper 27 fixed to the lower end of the shaft 25. The spring stopper 27 is fixed to the lower end of the shaft 25 by being fastened together by a fixing nut 28. A cap 26 is provided at the upper end of the shaft 25. A portion of the outer peripheral surface of the shaft 25 that is exposed from the core metal base 31 is formed with an outer tapered surface 25a that increases in diameter toward the lower side in the axial direction.

  On the outer periphery of the outer tapered surface 25a of the shaft 25, the pressure claws 24 are connected in the circumferential direction and arranged in an annular shape. The inner peripheral surface of each pressure claw 24 is an inner tapered surface 24a that increases in diameter toward the lower side in the axial direction. The outer tapered surface 25a of the shaft 25 and the inner tapered surface 24a of each pressure claw 24 are in contact with each other, and the movement of the shaft 25 upward in the axial direction causes the outer tapered surface 25a of the shaft 25 and the pressure claw 24 to move. The inner taper surface 24a is slid. As the shaft 25 moves upward in the axial direction, the inner tapered surface 24a of the pressure claw 24 is reduced in diameter, so that the force that the shaft 25 presses the pressure claw 24 radially outward acts. The pressure claw 24 moves outward in the radial direction.

  Each pressure claw 24 is annularly arranged on the outer periphery of the outer tapered surface 25 a of the shaft 25 by attaching both end portions in the axial direction to the shaft 25 by the annular member 34. As shown in FIGS. 5A and 5B, the annular member 34 is formed in an annular shape having an abutment portion 34a, and screw holes 34b penetrating in the radial direction are spaced at equal intervals along the circumferential direction. Is formed. The annular member 34 is made of a thin metal material. As shown in FIG. 4, each annular member 34 is disposed at a stepped portion 24 b of each pressure claw 24 and is fixed to each pressure claw 24 with a screw (not shown). Since each of the pressure claws 24 can be elastically expanded and contracted, the pressure claws 24 are attached to the shaft 25 even when the pressure claws 24 are pressed radially outward by the shaft 25. It can move in the radial direction.

  A cored bar lock 35 is provided between the pressure claw 24 and the cored bar holder 32, and the cored bar lock 35 is fitted with a positioning recess 24 c that is recessed in the lower end surface of the pressured claw 24. Alignable positioning pins 35a are provided. Therefore, the pressure claw 24 is positioned by fitting the positioning recess 24 c of the pressure claw 24 and the positioning pin 35 a of the cored bar lock 35. A support portion 35 b that supports the stator 3 is provided on the outer peripheral surface of the cored bar lock 35.

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 a first arrangement step, as shown in FIG. 6, each divided core 11 in a state in which a winding 15 is wound around each tooth portion 13 is formed into a substantially annular shape, and each divided core 11 is a core metal 23. Each of the split cores 11 is arranged on the support portion 35b so as to be positioned on the outer peripheral side. At this time, the shaft 25 is pulled downward in the axial direction by a spring 33 that biases downward in the axial direction. Accordingly, since the shaft 25 is slightly moved downward in the axial direction, the outer tapered surface 25a of the shaft 25 and the inner tapered surface 24a of the pressure claw 24 slide, and the axially upper side of the outer tapered surface 25a is shifted. The pressure claw 24 is slightly moved inward in the radial direction along the reduced diameter portion. Therefore, the outer diameter of the core metal 23 is smaller than the inner diameter of the split core 11 (stator core 10), and the split core 11 is easily arranged in an annular shape on the outer peripheral side of the core metal 23. Moreover, in the state which has arrange | positioned the division | segmentation core 11 to the outer peripheral side of the metal core 23, it has the positional relationship where each division | segmentation core 11 and each pressurization nail | claw 24 each opposed.

  Next, as a second arrangement step, as shown in FIG. 7, the annular jig 22 is arranged so as to cover the entire divided core 11. At this time, the positioning recess 22c of the annular jig 22 is fitted with a positioning pin 31a provided on the upper surface of the core metal base 31, and the annular jig is fitted by the fitting of the positioning recess 22c and the positioning pin 31a. 22 is positioned with respect to the cored bar base 31. In this state, a slight gap is provided between the inner peripheral surface 22 d of the annular jig 22 and the outer peripheral surface 11 a of the split core 11.

  As described above, in the state where the split core 11 and the annular jig 22 are installed on the metal core 23 as described above, the shaft 25 is first pushed upward by a force acting on the upper side in the axial direction of the spring 33. Here, in the present embodiment, the force acting on the upper side in the axial direction of the spring 33 serves as the operation applying means. As the shaft 25 moves upward in the axial direction, the outer tapered surface 25a of the shaft 25 and the inner tapered surface 24a of the pressure claw 24 are slid. As the shaft 25 moves upward in the axial direction, the inner tapered surface 24a of the pressure claw 24 is reduced in diameter, so that the force that the shaft 25 presses the pressure claw 24 radially outward acts. Then, each pressure claw 24 is pressed outward in the radial direction. When each pressure claw 24 is pressed radially outward, the outer peripheral surface 24d (pressing surface) of each pressure claw 24 comes into contact with the inner peripheral surface of each divided core 11, and each divided core 11 is radially outer. Is pressed. And the outer peripheral surface 11a of each division | segmentation core 11 pressed to the radial direction outer side contacts the inner peripheral surface 22d of the cyclic | annular jig | tool 22, and the movement to the radial direction outer side in the division | segmentation core 11 is controlled. Accordingly, each divided core 11 is sandwiched between the inner peripheral surface 22d of the annular jig 22 and the outer peripheral surface 24d of each pressure claw 24 and is uniformly pressed along the circumferential direction. That is, the split core 11 is restricted from moving further radially inward or radially outward, and for example, some of the split cores 11 move radially inward or radially outward of other split cores 11. Therefore, the split core 11 can be circularized with high accuracy.

  Subsequently, as a welding process, both ends in the circumferential direction of the split core 11 exposed to the outside from the outer through hole 22b of the annular jig 22 are fixed by laser welding. Thereby, each divided core 11 is fixed in a state of being circularized with high accuracy, and the stator 3 with high accuracy can be manufactured.

In the above embodiment, the following effects can be obtained.
(1) While arrange | positioning the division | segmentation core 11 cyclically | annularly on the outer peripheral side of the metal core 23, the cyclic | annular jig | tool 22 is arrange | positioned so that the division core 11 whole may be covered on the outer peripheral side of the division | segmentation core 11. And by moving the shaft 25 upward in the axial direction, the outer tapered surface 25a of the shaft 25 and the inner tapered surface 24a of the pressure claw 24 are slid, and each pressure claw 24 is pressed radially outward, Each pressure claw 24 moves each divided core 11 radially outward. Each of the split cores 11 that has moved outward in the radial direction comes into contact with the inner peripheral surface 22d of the annular jig 22 so as to be restricted from moving outward in the radial direction. The claw 24 is sandwiched between the outer peripheral surfaces 24d and is pressed uniformly along the circumferential direction. That is, the split core 11 is restricted from moving further radially inward or radially outward, and for example, some of the split cores 11 move radially inward or radially outward of other split cores 11. Therefore, the split core 11 can be circularized with high accuracy. A highly accurate stator can be manufactured by welding the split cores 11 that are annularized with high precision in a welding process. Further, since the annular jig 22 is arranged on the outer peripheral side of the split core 11, unlike the conventional case where each claw member is assembled to the taper holder by the guide bolt, the annular jig 22 is easily attached. Detachable. Therefore, even if fume (smoke containing oil) generated due to the influence of oil remaining in the split core 11 by welding adheres to the metal core 23 and the annular jig 22, maintenance of the annular jig 22 is easy. In addition to removing the annular jig 22 and further removing the split core 11, maintenance of the cored bar 23 can also be performed.

  (2) When the split core 11 is arranged on the outer peripheral side of the cored bar 23, the shaft 25 is pulled downward in the axial direction by a spring 33 that biases downward in the axial direction. Accordingly, since the shaft 25 is slightly moved downward in the axial direction, the outer tapered surface 25a of the shaft 25 and the inner tapered surface 24a of the pressure claw 24 slide, and the axially upper side of the outer tapered surface 25a is shifted. The pressure claw 24 is slightly moved inward in the radial direction along the reduced diameter portion. Therefore, the outer diameter of the core metal 23 is smaller than the inner diameter of the split core 11 (stator core 10), and the split core 11 is easily arranged in an annular shape on the outer peripheral side of the core metal 23.

  (3) When the shaft 25 moves upward in the axial direction, the outer tapered surface 25a of the shaft 25 and the inner tapered surface 24a of the pressure claw 24 slide, and the shaft 25 moves the pressure claw 24 radially outward. Press. And when the pressurization nail | claw 24 moves to radial direction outer side, the division | segmentation core 11 is moved to radial direction outer side. Therefore, a pressing force acts uniformly on each divided core 11 along the radially outer side and the circumferential direction, and each divided core 11 can be annularized with higher accuracy.

  (4) Twelve outer through holes 22b that penetrate in the radial direction and extend along the lower side in the axial direction are formed on the side surface of the annular jig 22 at equal intervals along the circumferential direction. It is formed in the position corresponding to. Therefore, at the time of a welding process, the circumferential direction both surfaces of the division | segmentation core 11 which adjoins via the outer side through-hole 22b can fix the division | segmentation cores 11 in the state circularized with high precision. 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. The shape of the split core 11 can be simplified as compared with the case where the engaging convex part and the engaging concave part are engaged with each other by forming the joint concave part and pressurizing each of the split cores arranged annularly. Moreover, even if it is the state arrange | positioned so that the cyclic | annular jig | tool 22 may cover the division core 11 whole like this embodiment, the circumferential direction both surfaces of the division | segmentation core 11 which adjoins via the outer through-hole 22b are welded. can do.

  (5) Since the plurality of pressure claws 24 are attached to the shaft 25 by the annular member 34, the plurality of pressure claws 24 can be combined. Further, the shaft 25 moves upward in the axial direction to slide the inner tapered surface 24a of the pressure claw 24 and the outer tapered surface 25a of the shaft 25, and the shaft 25 presses the pressure claw 24 radially outward. However, since the annular member 34 can be elastically expanded and contracted in the radial direction, the pressure claw 24 can be moved radially outward while being attached to the shaft 25.

In addition, you may change the said embodiment as follows.
In the embodiment, the divided cores 11 are fixed by laser welding, but not limited thereto, the divided cores 11 may be fixed by other welding such as arc welding.

  In the embodiment, the annular member 34 is formed of a thin metal plate and is formed in an annular shape having the abutment portion 34a. However, the present invention is not limited to this. For example, the annular member 34 is configured by an elastic member such as rubber. You may form in an annular | circular shape.

  In embodiment, although the welding process which fixes each division | segmentation core 11 by laser welding as a joining process was applied, it is not restricted to this. For example, an engagement convex portion is formed on one end side in the circumferential direction of the divided annular portion 12 of each divided core 11, and an engagement concave portion that engages with the engagement convex portion is formed on the other circumferential side, and arranged annularly. By pressurizing each of the divided cores 11 in a pressurizing step, the engagement convex portions and the engagement concave portions may be engaged to fix the divided cores 11 to each other.

  In the embodiment, the annular jig 22 is arranged so as to cover the entire divided core 11, but not limited thereto, the movement of the divided core 11 in the radial direction can be restricted, and the divided cores 11 can be connected to each other. The annular jig 22 may be configured to cover a part of the split core 11 as long as it can be circularized with high accuracy.

  In the present embodiment, the number of the pressure claws 24 is twelve, which is the same number as the divided cores 11. However, the number of the pressure claws 24 is not limited to this. There may be more or less than twelve as long as pressure can be applied.

(A) is a top view of the brushless motor in this embodiment, (b) is the sectional view on the AA line in Fig.1 (a). (A) is the top view which looked at the stator from the holder side, (b) is the BB sectional drawing in Fig.2 (a). (A) is a longitudinal cross-sectional view of an annular jig, and (b) is a cross-sectional view taken along the line CC in FIG. The partial cross section figure of a metal core. (A) is a top view of an annular member, (b) is a front view of an annular member. The partial cross section figure which shows the state where the 1st arrangement | positioning process was performed. The partial sectional view showing the state where the 2nd arrangement process was performed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Stator, 10 ... Stator core, 11 ... Split core, 11a ... Outer peripheral surface, 21 ... Manufacturing apparatus, 22 ... Ring jig as 2nd member, 22b ... Outer through-hole, 22d ... Inner peripheral surface, 23 ... First 1 is a metal core, 24 is a pressure claw as a pressure piece, 24a is an inner tapered surface, 24d is an outer peripheral surface as a pressing surface, 25 is a shaft, 25a is an outer tapered surface, and 34 is an annular member.

Claims (9)

A stator manufacturing method in which a stator core is constituted by a plurality of divided cores,
A first disposing step of annularly disposing the split cores on the outer peripheral side of the first member that can expand and contract in the radial direction;
A second disposing step of disposing a cylindrical second member that restricts the radially outward movement of the split core on the outer peripheral side of the split core;
Pressing the split core to move it radially outward by expanding the diameter of the first member, and bringing the outer peripheral surface of the split core into contact with the inner peripheral surface of the second member;
A stator manufacturing method comprising: a joining step of joining the split cores after the pressurizing step.   2. The method for manufacturing a stator according to claim 1, wherein the first arrangement step is performed by reducing the diameter of the first member from an inner diameter of the divided core. The first member includes a shaft and a plurality of pressure pieces that are arranged on the outer peripheral side of the shaft and can be expanded and contracted in the radial direction.
The inner peripheral surface of the pressure piece is an inner tapered surface that increases in diameter toward the one end side in the axial direction, and the outer peripheral surface in the shaft includes an outer tapered surface that increases in diameter toward the one end side in the axial direction. And
In the pressing step, the pressure piece is pressed by sliding the inner tapered surface and the outer tapered surface by moving the shaft, and the pressure piece is moved radially outward, The method for manufacturing a stator according to claim 1 or 2, wherein the stator core is pressed by a pressure piece.   The method for manufacturing a stator according to any one of claims 1 to 3, wherein the joining step is a welding step of welding the divided cores. The second member is formed with an outer through hole extending in the radial direction and extending in the radial direction,
The said welding process is performed through the said outer through-hole in the state which has arrange | positioned the said outer through-hole formed in the said 2nd member corresponding to the junction part of the said split cores. Stator manufacturing method. A stator manufacturing apparatus in which a stator core is configured by a plurality of divided cores,
A first member that is disposed on the inner peripheral side of the divided core, is radially expandable and contractible, and has a pressing surface that presses the inner peripheral surface of the divided core during diameter expansion;
A cylindrical second member that is disposed on the outer peripheral side of the split core and restricts the radially outward movement of the split core;
Giving an operation to increase the diameter of the first member in a state where the first member is disposed on the inner peripheral side of the split core and the second member is disposed on the outer peripheral side of the split core. And a stator manufacturing apparatus. The first member includes a shaft and a plurality of pressure pieces that are arranged on the outer peripheral side of the shaft and can be expanded and contracted in the radial direction.
The inner peripheral surface of the pressure piece is an inner tapered surface that increases in diameter toward the one end side in the axial direction, and the outer peripheral surface in the shaft includes an outer tapered surface that increases in diameter toward the one end side in the axial direction. And
The first member is expanded by the operation applying means by sliding the outer tapered surface and the inner tapered surface by the movement of the shaft so that the pressure piece is pressed to expand the diameter. The stator manufacturing apparatus according to claim 6, wherein the split core is pressed by moving the pressing piece radially outward.   The stator manufacturing apparatus according to claim 7, wherein the plurality of pressure pieces are mounted in a state of being annularly arranged with respect to the shaft by an annular member that can be elastically expanded and contracted in a radial direction.   The second member penetrates the second member in the radial direction and extends in the axial direction at a position corresponding to the joint between the divided cores when arranged on the outer peripheral side of the divided core. The stator manufacturing apparatus according to any one of claims 6 to 8, wherein a hole is formed.

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