JP5117825B2 - Stator manufacturing method, stator and brushless motor - Google Patents

Description

  The present invention relates to a stator manufacturing method, a stator, and a brushless motor including the stator.

  In a brushless motor having a configuration in which a rotor having permanent magnets arranged in the circumferential direction rotates with respect to a stator having a stator core having a plurality of radially extending teeth and a coil wound around the teeth, the rotor rotates. The accompanying reaction force acts on the tip of the teeth to vibrate the stator in the circumferential direction. As a result, noise due to vibration is generated in the brushless motor. In particular, when the stator core is configured by arranging the divided cores each having a tooth in the circumferential direction, each of the divided cores may vibrate, and noise due to the vibration may increase. In a vehicle equipped with such a brushless motor, noise due to the vibration of the stator may become noise in the passenger compartment. Therefore, in order to suppress the noise in the passenger compartment, it is desired to reduce the vibration of the brushless motor during driving.

Therefore, a brushless motor having a configuration for reducing vibration during driving has been proposed. For example, in a brushless motor described in Patent Document 1, a vibration damping member made of resin is filled between teeth each having a coil wound thereon, and the vibration in the circumferential direction of the stator is suppressed by the vibration damping member. ing.
JP 2000-253606 A

  By the way, when manufacturing the stator described in Patent Document 1, generally, a stator core around which a coil is wound is placed in a molding die, and the molding die is filled with resin by an injection molding machine. The resin that becomes the vibration damping member is filled between the teeth around which the coil is wound. When the stator is manufactured in this way, a dedicated molding die, an injection molding machine, and the like are required, so that the equipment cost is increased. In addition, when the core is placed in the mold and the vibration damping member is filled, burrs are generated in the vicinity of the split surface of the mold, and thus a deburring process for removing the burrs is added. For this reason, the number of processes when manufacturing the stator is increased, leading to a decrease in productivity. Therefore, there is a problem that the manufacturing cost increases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a stator manufacturing method capable of reducing vibrations and manufacturing costs, a stator, and a brushless motor including the stator. There is.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a stator core in which a plurality of divided cores each having teeth arranged so as to extend radially are arranged in an annular shape so that the tips of the teeth are inside. And a plurality of coils each wound around the teeth, and a vibration damping member made of resin interposed between the teeth around which the coils are wound, which is a direct or indirect manufacturing method. A plurality of the divided cores connected to each other so as to be rotatable in a straight line so that the plurality of teeth are parallel to each other, or arranged in an arc shape so that the tips of the teeth are on the outer peripheral side, An arrangement step of arranging the melted vibration damping member between the teeth around which the wire is wound and a rotation of the split core so that the front ends of the adjacent teeth approach each other. Then, while pressing the vibration damping member with the adjacent teeth, an annularization step of forming the plurality of divided cores in an annular shape so that the tips of the teeth are inside, and solidifying the vibration damping member The gist is that it comprises a solidification step.

  According to the method, in the arranging step, the plurality of divided cores are arranged in a straight line so that the plurality of teeth are parallel or in an arc shape so that the tips of the teeth are on the outer peripheral side, and the coil is wound. A melted vibration damping member is placed between the teeth. In the circularization step, the split cores are rotated so that the tip portions of adjacent teeth approach each other, and the vibration damping member is pressed by the adjacent teeth, and a plurality of the tips of the teeth are placed inside. The split core is formed into an annular shape. Therefore, in the arrangement step and the circularization step, it is not necessary to use a dedicated molding die or an injection molding machine in order to interpose the vibration damping member between the teeth around which the coil is wound. Further, since the stator core is not disposed in the mold and the vibration damping member is not interposed between adjacent teeth, no burr is generated. Therefore, it is not necessary to perform the deburring process. As a result, the facility cost can be reduced, the productivity can be improved, and the manufacturing cost can be reduced. In the brushless motor having the stator manufactured by the manufacturing method of the present invention, even if a force that vibrates the stator in the circumferential direction acts on the teeth, the vibration in the circumferential direction of the stator is caused by the vibration damping member. It is suppressed. Moreover, since the positional relationship between the adjacent divided cores is maintained by the solidified vibration damping member, the vibration in the circumferential direction of each divided core is suppressed. Further, when the vibration damping member melted by the adjacent teeth around which the coils are wound is pressed from both sides in the circumferential direction in the annular process, the vibration damping member diffuses into the gaps of the coil and at the same time, the reaction force causes the coil to move. Press against the circumferential side of the teeth. Therefore, the position of the coil with respect to the teeth is stabilized.

  According to a second aspect of the present invention, in the stator manufacturing method according to the first aspect, a plurality of types of vibration damping members having different hardnesses are disposed between the adjacent teeth, and the teeth are disposed in the arranging step. The gist of the present invention is to dispose the vibration damping member having higher viscosity and higher rigidity than the vibration damping member disposed on the distal end side of the tooth.

  According to this method, since the vibration damping member disposed on the base end side of the teeth has a higher viscosity than the vibration damping member disposed on the distal end side of the teeth, the leakage of the vibration damping member to the outer peripheral side of the stator core. Is suppressed. Further, since the vibration damping member disposed on the base end side of the teeth is higher in rigidity than the vibration damping member disposed on the tip end side of the teeth, the outer periphery of the stator core (the base end side portion of each tooth) The rigidity can be increased. Furthermore, vibration of the teeth can be more effectively damped by disposing a vibration damping member having a rigidity lower than that of the vibration damping member disposed on the base end side of the teeth on the distal end side of the teeth that are more likely to vibrate. it can. Further, by arranging a plurality of types of vibration damping members having different rigidity (Young's modulus) between adjacent teeth around which coils are wound, the vibration damping effect can be enhanced.

  According to a third aspect of the present invention, in the stator manufacturing method according to the second aspect, in the annularization step, the divided cores are rotated so that the tip portions of the adjacent teeth approach each other, and are adjacent to each other. By pressing the vibration damping member with the teeth, the vibration damping member disposed on the proximal end side of the teeth and the vibration damping member disposed on the distal end side of the teeth are in close contact with each other in the radial direction. Its gist is to be combined.

  According to this method, in the arranging step, the plurality of types of vibration damping members arranged between the teeth around which the coils are wound are different in rigidity and are tightly coupled to each other in the radial direction. Enhanced.

  According to a fourth aspect of the present invention, in the stator manufacturing method according to the second or third aspect, the first vibration damping member and the first vibration damping member are disposed between the adjacent teeth. Two types of the vibration damping members, which are a low-viscosity and high-elasticity second vibration damping member, are interposed, and in the arranging step, after arranging the first vibration damping member on the base end side of the teeth, The gist is to arrange the second vibration damping member on the tip side of the teeth.

  According to this method, since the second vibration damping member disposed on the distal end side of the tooth is more elastic than the first vibration damping member disposed on the proximal end side of the tooth, the portion on the distal end side of the tooth It is easy to absorb the vibration in the circumferential direction. Accordingly, a higher vibration damping effect can be obtained. In addition, the second vibration damping member disposed on the distal end side of the teeth is less viscous than the first vibration damping member disposed on the proximal end side of the teeth, and thus is easily diffused by the gap between the coils. Furthermore, since there are two types of vibration damping members arranged between adjacent teeth, complication of the arrangement process is suppressed.

According to a fifth aspect of the present invention, a plurality of split cores each having teeth arranged so as to extend radially are respectively wound around the teeth, and a stator core that is annularly arranged so that the tips of the teeth are inside. And a plurality of types of vibration damping members having different hardnesses interposed between the teeth around which the coils are wound, and between the teeth adjacent in the circumferential direction, the plurality of types The gist of the invention is that the vibration damping member is disposed, and that the vibration damping member having a rigidity higher than that of the vibration damping member disposed on the distal end side of the teeth is disposed on the proximal end side of the teeth . .

  According to this configuration, in the brushless motor provided with the stator of the present invention, the circumferential direction of the stator when the motor is driven by the plurality of types of vibration damping members having different hardness interposed between the teeth around which the coil is wound. Vibration is suppressed. Moreover, since the positional relationship between the adjacent divided cores is maintained by the vibration damping member, the circumferential vibration in each divided core is suppressed. In order to dispose the vibration damping member between the teeth, first, a plurality of divided cores connected directly or indirectly are linearly arranged so that the plurality of teeth are parallel, or the tips of the teeth are on the outer peripheral side. It arrange | positions so that it may become arc shape, and the vibration damping member of the melted state is arrange | positioned between the teeth with which the coil was wound. Then, rotate the split cores so that the tips of adjacent teeth approach each other, and press the vibration attenuating member with the adjacent teeth while annularly forming the split cores so that the tips of the teeth are inside. By shaping, the vibration damping member can be disposed between the teeth around which the coil is wound. If it does in this way, in order to interpose a vibration damping member between the teeth by which the coil was wound, it is not necessary to use an exclusive shaping | molding die, an injection molding machine, etc. Further, since the stator core is not disposed in the mold and the vibration damping member is not disposed between adjacent teeth, no burr is generated. Therefore, it is not necessary to perform the deburring process. As a result, the facility cost can be reduced, the productivity can be improved, and the manufacturing cost can be reduced. When the vibration damping member in a melted state by adjacent teeth around which the coil is wound is pressed from both sides in the circumferential direction, the vibration damping member diffuses into the gap between the coils and at the same time, the reaction force causes the coil to move in the circumferential direction of the teeth. Press against the side. Therefore, the position of the coil with respect to the teeth is stabilized.

  According to this configuration, the vibration damping member disposed on the proximal end side of the teeth is higher in rigidity than the vibration damping member disposed on the distal end side of the teeth, so the outer peripheral portion of the stator core (the proximal end side of each tooth). ) Can be increased in rigidity. Furthermore, vibration of the teeth can be more effectively damped by disposing a vibration damping member having a rigidity lower than that of the vibration damping member disposed on the base end side of the teeth on the distal end side of the teeth that are more likely to vibrate. it can. Further, by arranging a plurality of types of vibration damping members having different rigidity (Young's modulus) between adjacent teeth around which coils are wound, the vibration damping effect can be enhanced.

According to a sixth aspect of the present invention, in the stator of the fifth aspect, the vibration damping members adjacent in the radial direction between the teeth adjacent in the circumferential direction are tightly coupled to each other in the radial direction. It is a summary.

  According to the same configuration, the plurality of types of vibration damping members disposed between the teeth each having the coil wound thereon have different rigidity and are tightly coupled to each other in the radial direction, thereby further enhancing the vibration damping effect.

According to a seventh aspect of the invention, in the stator of the fifth or sixth aspect , between the adjacent teeth, the first vibration damping member and the hardness are smaller than those of the first vibration damping member. In addition, two types of vibration damping members, ie, a second vibration damping member having high elasticity, are interposed, the first vibration damping member is disposed on the proximal end side of the teeth, and the first vibration damping member is disposed on the distal end side of the teeth. The gist is that two vibration damping members are arranged.

  According to this configuration, the second vibration damping member disposed on the distal end side of the tooth is smaller in hardness and elastic than the first vibration damping member disposed on the proximal end side of the tooth. It is easy to absorb the vibration in the circumferential direction at the tip side. Accordingly, a higher vibration damping effect can be obtained. In addition, since there are two types of vibration damping members disposed between adjacent teeth, it is easy to place the vibration damping members when the stator is manufactured.

The gist of the invention described in claim 8 is that it includes the stator according to any one of claims 5 to 7 and a rotor disposed inside the stator.
According to this configuration, during the rotation of the rotor, vibration generated in the stator such as magnetic vibration is attenuated by the vibration damping member. Therefore, noise caused by the vibration of the stator can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the stator which can reduce a vibration while reducing a manufacturing cost, a stator, and the brushless motor provided with this stator can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a cross-sectional view of the brushless motor of this embodiment. As shown in FIG. 1, an annular stator 2 is fixed to an inner peripheral surface of a housing case 1 having a bottomed cylindrical shape. As shown in FIG. 2, the stator core 3 constituting the stator 2 is composed of twelve divided cores 4 having a T shape when viewed from the axial direction and arranged in the circumferential direction. As shown in FIG. 3A, each divided core 4 includes a connecting and fixing portion 4a having an arc shape when viewed from the axial direction, and a radially inner side from a substantially central portion in the circumferential direction of the connecting and fixing portion 4a. The first and second core sheets 5 and 6 having a T shape when viewed from the axial direction are alternately laminated in the plate thickness direction. Note that the split core 4 shown in FIG. 1 is shown with the first and second core sheets 5 and 6 omitted.

  As shown in FIG. 3 (b), in the first core sheet 5, one end portion in the circumferential direction of the arc-shaped first laminated fixing portion 5a to be the connection fixing portion 4a (on the right side in FIG. 3 (b)). The first connecting recess 5b is formed in the circumferential direction in a circular arc shape, and the other circumferential end (the left end in FIG. 3 (b)) The 1st connection convex part 5c which protruded circularly in the direction is formed. On the other hand, as shown in FIG. 3 (c), the second core sheet 6 is formed in a line-symmetric shape with respect to the first core sheet 5 when viewed from the axial direction, and forms an arcuate shape that serves as a connection fixing portion 4a. A second connecting convex portion 6b protruding in an arc shape in the circumferential direction is formed at one circumferential end of the second laminated fixing portion 6a (the right end in FIG. 3C). At the other end in the circumferential direction (the left end in FIG. 3C), a second connection recess 6c is formed that is recessed in an arc shape in the circumferential direction. And as shown to Fig.3 (a), the 1st core sheet 5 and the 2nd core sheet 6 which were laminated | stacked alternately by the plate | board thickness direction are crimped and integrated in the plate | board thickness direction.

  The divided cores 4 formed by laminating the first and second core sheets 5 and 6 are axially disposed at both ends in the circumferential direction of the connection fixing portion 4a by the first and second lamination fixing portions 5a and 6a. A concavity and convexity shape continuous to each other is formed, and adjacent divided cores 4 are arranged by fitting the concavities and convexities at the end portions in the circumferential direction of the connection fixing portion 4a. In the state in which the concave and convex portions of the circumferential ends of the adjacent coupling fixing portions 4a are fitted to each other, the second coupling convex portion 6b is fitted into the first coupling concave portion 5b, and the first coupling convex portion 5c is the second coupling concave portion. Fits 6c. The adjacent split cores 4 are guided by the first and second connecting convex portions 5c and 6b and the first and second connecting concave portions 5b and 6c, and are centered on the end in the circumferential direction of the connecting and fixing portion 4a. Are mutually rotatable.

  Further, as shown in FIGS. 4A and 4B, each divided core 4 has an insulator 7 that covers a portion other than the radially outer side surface of each divided core 4 and the tip end surface of the teeth 4b. It is mounted from both sides in the axial direction. The insulator 7 includes an end surface covering portion 7a that covers one end surface in the axial direction of the tooth 4b in the split core 4, a pair of side surface covering portions 7b that respectively cover both side surfaces in the circumferential direction of the tooth 4b, and a connection fixing portion 4a. A connection covering portion 7c that covers the surface on the side of the teeth 4b is integrally formed. Further, a prevention wall 7d that extends in the circumferential direction on the coupling fixing portion 4a and is erected in the axial direction is integrally formed at an end portion on the radially outer side of the end surface covering portion 7a. One end portion in the circumferential direction of the prevention wall 7d (the left end portion in FIG. 4B) is formed with a connecting recess 7e that is recessed in an arc shape in the circumferential direction, and the other end portion in the circumferential direction (see FIG. 4 (b) is integrally formed with a connecting projection 7f having a substantially cylindrical shape extending in the axial direction. The insulators 7 respectively attached to the split cores 4 adjacent to each other in the circumferential direction are connected so as to be rotatable around the connection convex portion 7f by engaging the connection convex portion 7f in the connection concave portion 7e. . That is, the twelve divided cores 4 are indirectly connected via the insulator 7.

  Then, as shown in FIG. 2, the coils 9 are wound around the teeth 4 b of the divided cores 4 to which the insulators 7 are mounted by winding the conductive wires 8 from above the insulators 7 in a concentrated manner. ing. In FIG. 2, only the teeth 4 b of the three divided cores 4 among the 12 divided cores 4 are illustrated by broken lines. The prevention wall 7d prevents the coils 9 from protruding outward in the radial direction, and each coil 9 is connected to an external drive circuit (not shown). Furthermore, the twelve divided cores 4 are arranged in the circumferential direction so that the tips of the teeth 4b face inward and the teeth 4b extend radially, and are formed in an annular shape. And the connection fixing | fixed part 4a of the 12 division | segmentation cores 4 (namely, stator core 3) shape | molded by the annular | circular shape comprises a cylindrical shape, and the outer peripheral surface of each connection fixing | fixed part 4a is the inside of the housing case 1 (refer FIG. 1). It is in pressure contact with the peripheral surface.

  Two types of vibration damping members having different properties, that is, first and second vibration damping members 11 and 12 are interposed between the teeth 4b around which the coils 9 are wound. The first vibration damping member 11 disposed on the base end side of each tooth 4b is a resin having higher rigidity than the second vibration damping member 12 disposed on the distal end side of the tooth 4b. For example, an epoxy resin is used. Used. Further, the second vibration damping member 12 is a resin (resin having a large Young's modulus) having a hardness smaller than that of the first vibration damping member 11 and having a large elasticity. For example, a silicon resin is used. The first and second vibration damping members 11 and 12 in this embodiment are both thermosetting resin materials.

  As shown in FIG. 5, the first and second vibration damping members 11 and 12 are wound with the coil 9 when the 12 divided cores 4 are formed in an annular shape so that the teeth 4b are inside. The teeth 4b are sandwiched and pressed from both sides in the circumferential direction. Therefore, the first and second vibration damping members 11 and 12 are diffused into the gap of the coil 9 by being pressed by the teeth 4b on both sides in the circumferential direction around which the coil 9 is wound, and each of the first and second vibration damping members 11 and 12 is caused by the reaction force. The coil 9 is pressed against the side surface in the circumferential direction of the tooth 4b.

  As shown in FIG. 1, a rotor 21 is rotatably disposed inside the stator 2. The rotor 21 is pivotally supported by a pair of bearings 23 a and 23 b provided respectively at the center of the bottom of the housing case 1 and the radial center of the end frame 22 that closes the opening of the housing case 1. The shaft 24, a cylindrical rotor yoke 25 fixed to the rotating shaft 24, and a plurality of permanent magnets 26 fixed to the outer peripheral surface of the rotor yoke 25. The plurality of permanent magnets 26 are opposed to the stator 2 in the radial direction. An annular sensor rotor 27 is fixed to the end of the rotating shaft 24 on the end frame 22 side, and an annular sensor is disposed on the end frame 22 so as to face the sensor rotor 27 in the radial direction. The stator 28 is fixed. The sensor rotor 27 and the sensor stator 28 constitute a resolver 29. The resolver 29 is for detecting the rotation state (rotation position, rotation speed, etc.) of the rotor 21 with respect to the stator 2, and a drive circuit provided with a position detection signal corresponding to the rotation state of the rotor 21 outside the brushless motor. (Not shown).

  In the brushless motor configured as described above, when the rotor 21 is rotated by energizing the coil 9, the sensor rotor 27 is rotated together with the rotating shaft 24. Then, the resolver 29 outputs a rotation detection signal corresponding to the rotation state of the sensor rotor 27, that is, the rotation state of the rotor 21 to a drive circuit (not shown). The drive circuit energizes the coil 9 based on the input rotation detection signal.

Next, the manufacturing method of said stator 2 with which a brushless motor is equipped is demonstrated. The stator 2 is manufactured through an arrangement process, an annularization process, and a solidification process.
First, in the arrangement step, the first and second vibration damping members 11 and 12 are arranged between the teeth 4b around which the coils 9 are wound. More specifically, as shown in FIG. 6, the twelve divided cores 4 connected via the insulator 7 are linearly arranged so that the twelve teeth 4b are parallel to each other. In the twelve divided cores 4 arranged in this manner, the interval between the tips of the adjacent teeth 4b is adjacent to the stator core 3 (see FIG. 2) in which the twelve divided cores 4 are arranged in an annular shape. It is wider than the interval between the tips of the teeth 4b. And in the dispenser 31, the 1st vibration damping member 11 is arrange | positioned in order by predetermined amount between the teeth 4b by which the coil 9 was wound. At this time, the first vibration damping member 11 is in a molten state and has a lower viscosity than the second vibration damping member 12 disposed later. Further, the first vibration damping member 11 is disposed between the adjacent teeth 4b on the base end side portion of the teeth 4b, that is, in the vicinity of the joint of the connecting and fixing portions 4a of the adjacent divided cores 4. Next, the second vibration attenuating member 12 is sequentially arranged by the dispenser 32 between the adjacent teeth 4b after the first vibration attenuating member 11 is arranged. At this time, the second vibration damping member 12 is in a melted state, and is disposed between the adjacent teeth 4b at the tip side of the teeth 4b.

  Next, in the annularization step, the twelve divided cores 4 on which the first and second vibration damping members 11 and 12 are arranged are formed from a linear shape into an annular shape. More specifically, the adjacent divided cores 4 are rotated so that the tips of the teeth 4b approach each other, and the twelve divided cores 4 are formed in an annular shape so that the tips of the teeth 4b face inward. Deploy. At this time, the first vibration damping member 11 and the second vibration damping member 12 are pressed from both sides in the circumferential direction by the teeth 4b around which the coil 9 is wound. As a result, the first and second vibration damping members 11 and 12 are diffused into the gap between the coils 9 wound around the teeth 4b on both sides, and are in close contact with each other in the radial direction. The coil 9 wound around each tooth 4b is pressed in the circumferential direction by the reaction force when pressing the first and second vibration damping members 11 and 12, and is pressed against the circumferential side surface of the tooth 4b. It is done.

  Next, in the solidification step, the 12 divided cores 4 formed into an annular shape in the annularization step, that is, the stator core 3 are heated in a state in which roundness is ensured with a jig or the like, and the first and second cores are heated. The vibration damping members 11 and 12 are solidified. Thus, the stator 2 is completed. The completed stator 2 is fixed to the inner peripheral surface of the housing case 1 by shrink fitting.

As described above, according to the present embodiment, the following operational effects are obtained.
(1) In the arranging step, the twelve divided cores 4 are arranged linearly so that the twelve teeth 4b are parallel, and the melted first and first teeth 4b around which the coil 9 is wound Two vibration damping members 11 and 12 are arranged. Then, in the annularization step, the split core 4 is rotated so that the tips of the adjacent teeth 4b come close to each other, and the first and second vibration damping members 11 and 12 are pressed by the adjacent teeth 4b. The twelve divided cores 4 are formed in an annular shape so that the tips of the teeth 4b are inside. Therefore, in the arrangement process and the circularization process, a dedicated molding die, an injection molding machine or the like is used to interpose the first and second vibration damping members 11 and 12 between the teeth 4b around which the coil 9 is wound. You don't have to. Further, since the stator core 3 is not disposed in the mold and the first and second vibration damping members 11 and 12 are not interposed between the adjacent teeth 4b, no burrs are generated. Therefore, it is not necessary to perform the deburring process. As a result, the facility cost can be reduced, the productivity can be improved, and the manufacturing cost can be reduced. And in the brushless motor provided with the stator 2, even if a force that vibrates the stator 2 in the circumferential direction acts on the teeth 4b, the circumferential direction of the stator 2 by the first and second vibration damping members 11 and 12 Vibration is suppressed. Therefore, the vibration of the brushless motor at the time of driving is reduced, and the noise in the passenger compartment can be kept small in a vehicle equipped with the brushless motor. Moreover, since the positional relationship between the adjacent divided cores 4 is maintained by the solidified first and second vibration damping members 11 and 12, vibrations in the circumferential direction of the divided cores 4 are suppressed. Furthermore, when the first and second vibration damping members 11 and 12 melted by the adjacent teeth 4b around which the coil 9 is wound are pressed from both sides in the circumferential direction in the annular process, the first and second vibrations are generated. The damping members 11 and 12 diffuse into the gap between the coils 9 and simultaneously press the coils 9 against the circumferential side surfaces of the teeth 4b by a reaction force. Therefore, the position of the coil 9 with respect to the teeth 4b is stabilized.

  (2) Since the first vibration damping member 11 disposed on the base end side of the tooth 4b is thicker than the second vibration damping member 12 disposed on the distal end side of the tooth 4b, the outer periphery of the stator core 3 Leakage of the first vibration damping member 11 to the side can be suppressed. Further, since the first vibration damping member 11 is higher in rigidity than the second vibration damping member 12, the rigidity in the outer peripheral portion of the stator core 3 (that is, the twelve connection fixing portions 4a) can be increased. Furthermore, the vibration of the teeth 4b is more effective by disposing the second vibration damping member 12 having a rigidity lower than that of the vibration damping member disposed on the base end side of the teeth 4b on the distal end side of the teeth 4b that is more easily vibrated. Can be attenuated. Further, when two kinds of first and vibration damping members 11 and 12 having different rigidity and elasticity (Young's modulus) are arranged between adjacent teeth 4b around which the coil 9 is wound, the first and second vibration damping members are arranged. Since the vibrations 11 and 12 mutually dampen vibrations, the vibration damping effect can be enhanced.

  (3) In the arranging step, the two types of first and second vibration damping members 11 and 12 arranged between the teeth 4b around which the coil 9 is wound are different in rigidity and are tightly coupled to each other in the radial direction. The Accordingly, in the completed stator 2, the effect of attenuating the mutual vibration between the first and second vibration damping members 11 and 12 becomes higher, so that the stator 2 formed by the first and second vibration damping members 11 and 12 is used. The vibration damping effect is further enhanced.

  (4) Since the second vibration damping member 12 disposed on the distal end side of the tooth 4b is more elastic than the first vibration damping member 11 disposed on the proximal end side of the tooth 4b, the distal end side of the tooth 4b. It is easy to absorb the vibration in the circumferential direction at the part. Accordingly, a higher vibration damping effect can be obtained. Further, since the second vibration damping member 12 disposed on the distal end side of the tooth 4b has a lower viscosity than the first vibration damping member 11 disposed on the proximal end side of the tooth 4b, the second vibration damping member 12 is diffused by the gap of the coil 9. Easy to do. Therefore, the second vibration damping member 12 and the coil 9 can be easily integrated. Furthermore, since there are two types of vibration damping members respectively disposed between the adjacent teeth 4b, complication of the arrangement process is suppressed.

  (5) The first and second vibration damping members 11 and 12 are diffused into the gap of the coil 9 by being pressed by the teeth 4b on both sides in the circumferential direction around which the coil 9 is wound in the circularization step. . Therefore, the first and second vibration damping members 11 and 12 do not completely fill the gap between the teeth 4b around which the coil 9 is wound. In general, a conventional stator provided with a vibration damping member made of resin also has a resin layer formed on both end surfaces in the axial direction of the stator core. Therefore, since the stator 2 manufactured through the arrangement process and the annular process of the present embodiment requires a small amount of resin to be used as the first and second vibration damping members 11 and 12, the manufacturing cost is further reduced. can do.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, two types of vibration damping members (that is, the first and second vibration damping members 11 and 12) are arranged between the teeth 4b around which the coil 9 is wound. The vibration damping member may be arranged. In this case, in the arrangement step, the same effects as (2) of the above-described embodiment can be obtained by arranging the plurality of vibration damping members on the proximal end side of the teeth 4b in order from the highest in rigidity.

  In the above embodiment, the first and second vibration damping members 11 and 12 disposed between the teeth 4b around which the coil 9 is wound are tightly coupled to each other in the radial direction. However, the first and second vibration damping members 11 and 12 respectively disposed between the teeth 4b around which the coil 9 is wound may be separated in the radial direction.

  In the above embodiment, the first vibration damping member 11 disposed on the distal end side of the tooth 4b has higher rigidity than the second vibration damping member 12 disposed on the distal end side of the tooth 4b. However, the plurality of types of vibration damping members disposed between the teeth 4b may be disposed in any order regardless of their properties.

  In the above embodiment, two types of vibration damping members (that is, the first and second vibration damping members 11 and 12) are arranged between the teeth 4b around which the coil 9 is wound. There may be only one type of vibration damping member disposed in the.

  In the above embodiment, the first and second vibration damping members 11 and 12 are arranged between the teeth 4b using the dispensers 31 and 32 in the arrangement step. However, the equipment used to arrange the first and second vibration damping members 11 and 12 may use equipment other than the dispensers 31 and 32 as long as the mold is not required.

  In the above embodiment, in the arranging step, the twelve divided cores 4 are arranged in a straight line so that the teeth 4b are parallel. However, the twelve divided cores 4 may be arranged in an arc shape so that the tips of the teeth 4b are on the outer peripheral side. The “straight shape” here is a state in which the interval between the tips of the teeth 4b is more open than the state in which the stator core 3 is configured by arranging the 12 divided cores 4 in an annular shape. This includes a substantially straight line shape in which the interval is narrower than when the 12 teeth 4b are arranged in parallel. This is because even in such a case, it is possible to dispose the vibration damping members 11 and 12 between the teeth 4b by the dispensers 31 and 32.

  In the above embodiment, the twelve divided cores 4 constituting the stator core 3 are connected via the insulators 7 attached to each of them. However, the 12 divided cores 4 should just be connected directly or indirectly so that rotation is mutually possible at least in an arrangement | positioning process and an annularization process. Therefore, for example, the adjacent divided cores 4 may be directly connected to each other at the end in the circumferential direction of the connection fixing portion 4a so as to be rotatable. Further, for example, the adjacent divided cores 4 may be indirectly connected via a jig in the arranging step and the circularizing step.

  In the above embodiment, the split core 4 is formed by alternately stacking the first and second core sheets 5 and 6 in the plate thickness direction. However, the split core 4 may be formed by sintering a magnetic metal powder.

  In the above embodiment, the stator core 3 is composed of twelve divided cores 4, but the number of divided cores 4 constituting the stator core 3 is not limited to twelve.

Sectional drawing of a brushless motor. The top view of a stator. (A) is a perspective view of a split core, (b) is a plan view of a first core sheet, and (c) is a plan view of a second core sheet. (A) is a perspective view of the division | segmentation core with which the insulator was mounted | worn, (b) is a top view of the division | segmentation core connected via the insulator. The partial expanded sectional view of a stator. The schematic diagram for demonstrating the manufacturing method of a stator.

Explanation of symbols

  2 ... Stator, 3 ... Stator core, 4 ... Split core, 4b ... Teeth, 9 ... Coil, 11 ... First vibration damping member (vibration damping member), 12 ... Second vibration damping member (vibration damping member), 21 ... rotor.

Claims (8)

A stator core formed by annularly arranging a plurality of divided cores each having teeth arranged so as to extend radially, such that the tips of the teeth are inside;
A plurality of coils wound respectively on the teeth;
A method for manufacturing a stator comprising a vibration damping member made of a resin interposed between the teeth around which the coil is wound,
The plurality of divided cores that are directly or indirectly connected to each other so as to be rotatable are arranged in a straight line so that the plurality of teeth are parallel or in a circular arc shape so that the tips of the teeth are on the outer peripheral side. An arrangement step of arranging the melted vibration damping member between the teeth around which the coil is wound;
The divided cores are rotated so that the tip portions of the adjacent teeth approach each other, and the vibration damping member is pressed by the adjacent teeth, and the plurality of the divided portions are arranged so that the tips of the teeth are inside. An annularization step for forming the core into an annular shape;
A stator manufacturing method comprising: a solidifying step of solidifying the vibration damping member. In the manufacturing method of the stator according to claim 1,
Between the adjacent teeth, a plurality of types of the vibration damping members having different hardnesses are disposed,
In the arranging step, the vibration damping member having higher viscosity and higher rigidity than the vibration damping member arranged on the distal end side of the teeth is arranged on the proximal end side of the teeth. Method. In the manufacturing method of the stator according to claim 2,
In the annularization step, the split cores are rotated so that the tip portions of the adjacent teeth approach each other, and the vibration damping member is pressed by the adjacent teeth, so that the base end side of the teeth is reached. The stator manufacturing method, wherein the arranged vibration damping member and the vibration damping member arranged on the tip end side of the teeth are tightly coupled to each other in the radial direction. In the stator manufacturing method according to claim 2 or 3,
Between the adjacent teeth, there are interposed two types of vibration damping members, a first vibration damping member and a second vibration damping member having lower viscosity and higher elasticity than the first vibration damping member. ,
In the arranging step, after the first vibration damping member is arranged on the proximal end side of the teeth, the second vibration damping member is arranged on the distal end side of the teeth. A stator core formed by annularly arranging a plurality of divided cores each having teeth arranged so as to extend radially, such that the tips of the teeth are inside;
A plurality of coils wound respectively on the teeth;
A plurality of types of vibration damping members with different hardness interposed between the teeth around which the coil is wound ;
The plurality of types of vibration damping members are disposed between the teeth adjacent in the circumferential direction, and the base end side of the teeth is more rigid than the vibration damping member disposed on the distal end side of the teeth. A stator having a large vibration damping member . The stator according to claim 5 , wherein
The stator according to claim 1, wherein the vibration damping members adjacent in the radial direction between the teeth adjacent in the circumferential direction are tightly coupled to each other in the radial direction. The stator according to claim 5 or 6 ,
Between the adjacent teeth, there are interposed two types of vibration damping members: a first vibration damping member and a second vibration damping member that is smaller in hardness and elastic than the first vibration damping member. A stator in which a first vibration damping member is disposed on the proximal end side of the teeth and the second vibration damping member is disposed on the distal end side of the teeth. A brushless motor comprising the stator according to any one of claims 5 to 7 and a rotor disposed inside the stator.

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