JP2016167959A - Stator and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit a stator core from inclining relative to a stator core holding member.SOLUTION: A stator 14 includes a stator core 30 having an annular part 42 and main teeth parts 44 and sub teeth parts 46 which extend from the annular part 42 in a radial direction. The stator 14 includes a stator base 36 having a bearing holder part 58 which is fitted in the annular part 42 and a flange part 60 extending from an end part at one side of the bearing holder part 58 to a radial outer side. Further, the stator 14 includes a stator cover 38 fixed to the bearing holder part 58. The stator core 30 is sandwiched between the stator base 36 and the stator cover 38 to restrict inclination of the stator core 30 relative to the bearing holder part 58.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stator and a motor.

  Patent Document 1 discloses a so-called outer rotor type brushless motor. This brushless motor includes a stator and a rotor that rotates by receiving a rotating magnetic field of the stator. Further, the stator core constituting a part of the stator is fixed to the stator core holding member by press-fitting a part of the stator core holding member (center piece) into the axial center portion of the stator core.

Japanese Patent Laying-Open No. 2015-8553

  However, if the stator core is fixed to the stator core holding member in a state of being inclined with respect to the stator core holding member, it is conceivable that abnormal noise is generated when the rotor rotates.

  An object of the present invention is to obtain a stator and a motor that can prevent the stator core from being inclined with respect to the stator core holding member in consideration of the above facts.

  The stator according to claim 1 is a stator core having an annular portion formed in an annular shape, and a tooth portion extending radially from the annular portion, and a cylinder that is formed in a cylindrical shape and press-fitted into the annular portion. A first stator core holding member having a ring-shaped portion, and a flange portion extending radially outward from an end portion on one side of the cylindrical portion, and a side on which the flange portion is disposed with respect to the stator core A second stator core holding member that is provided on the opposite side and is fixed to the cylindrical portion and restricts the inclination of the stator core with respect to the cylindrical portion by sandwiching the stator core with the first stator core holding member; It is equipped with.

  According to the stator of the first aspect, the cylindrical portion of the first stator core holding member is press-fitted into the annular portion of the stator core, so that the stator core is held by the first stator core holding member. Further, the second stator core holding member is fixed to the cylindrical portion of the first stator core holding member, so that the stator core is sandwiched between the first stator core holding member and the second stator core holding member. Thereby, the inclination with respect to the cylindrical part of a stator core can be suppressed.

  The stator according to claim 2 is a stator core having an annular portion formed in an annular shape, and a tooth portion extending in a radial direction from the annular portion, and a cylinder that is formed in a cylindrical shape and press-fitted into the annular portion. A cylindrical portion, a flange portion extending radially outward from one end of the cylindrical portion, and an inclination of the stator core with respect to the cylindrical portion by being in contact with the stator core. A first stator core holding member having a first restriction portion for restriction; and a first stator core holding member provided on a side opposite to the side on which the flange portion is disposed with respect to the stator core, wherein the first restriction portion abuts on the stator core. And a second stator core holding member having a second restricting portion that restricts the inclination of the stator core with respect to the tubular portion by contacting the surface opposite to the surface on which the stator core is located.

  According to the stator of the second aspect, the cylindrical portion of the first stator core holding member is press-fitted into the annular portion of the stator core, whereby the stator core is held by the first stator core holding member. Moreover, the inclination with respect to the cylindrical part of a stator core is suppressed because the 1st control part provided in the flange part of the 1st stator core holding member contact | abuts to a stator core. Further, the second restricting portion of the second stator core holding member abuts on the surface of the stator core opposite to the surface on which the first restricting portion abuts, whereby the inclination of the stator core with respect to the cylindrical portion is restricted. That is, in the present invention, the stator core is sandwiched between the first restricting portion of the first stator core holding member and the second restricting portion of the second stator core holding member, thereby suppressing the inclination of the stator core with respect to the cylindrical portion. Can do.

  A stator according to a third aspect is the stator according to the second aspect, wherein the first restricting portion and the second restricting portion are formed in a convex shape toward the stator core side.

  According to the stator of the third aspect, the first restricting portion and the second restricting portion are formed in a convex shape toward the stator core side, so that the first restricting portion and the second restricting portion are desired for the stator core. It can be made easy to contact with the position. Thereby, the precision of the inclination with respect to the cylindrical part of a stator core can be improved.

  According to a fourth aspect of the present invention, in the stator according to any one of the first to third aspects, the radially outer surface of the cylindrical portion is formed in a convex shape toward the radially outer side. And centering portions arranged at equal intervals along the circumferential direction.

  According to the stator of the fourth aspect, since the centering portion is formed on the outer peripheral surface of the cylindrical portion, the core between the stator core and the cylindrical portion is pressed when the cylindrical portion is press-fitted into the annular portion of the stator core. It can be done easily.

  The stator according to claim 5 is the stator according to any one of claims 2 to 4, wherein at least one of the first restricting portion and the second restricting portion is the annular portion in the teeth portion. Is in contact with the opposite end.

  According to the stator of claim 5, at least one of the first restricting portion and the second restricting portion is brought into contact with the end portion of the teeth portion on the side away from the annular portion, thereby tilting the stator core with respect to the tubular portion. Accuracy can be improved.

  The stator according to claim 6 is the stator according to any one of claims 2 to 5, wherein the teeth portion includes a main teeth portion around which a coil is formed, and the coil is formed around the main tooth portion. It is considered as a sub-tooth portion that is not made, and the first restriction portion and the second restriction portion are in contact with the sub-tooth portion.

  According to the stator of the sixth aspect, the first restricting portion and the second restricting portion are brought into contact with the sub-tooth portion where the coil is not formed, whereby the contact area between the first restricting portion and the stator core and the second restricting portion are set. The contact area between the portion and the stator core can be easily ensured.

  The stator according to claim 7 is the stator according to any one of claims 2 to 6, wherein the first restricting portion and the second restricting portion are arranged at equal intervals along a circumferential direction. Yes.

  According to the stator of the seventh aspect, the stator core is balanced between the first restricting portion and the second restricting portion by arranging the first restricting portion and the second restricting portion at equal intervals along the circumferential direction. It becomes possible to pinch well.

  A stator according to an eighth aspect is the stator according to any one of the second to seventh aspects, wherein the second restricting portion is formed in a convex shape toward the stator core side and the first. 2 A deformable portion is provided that is deformed by pressing the stator core holding member toward the stator core side.

  According to the stator of the eighth aspect, when the second stator core holding member is pressed toward the stator core side, the deformable portion provided in the second restricting portion is deformed. Thereby, it is possible to suppress unintended bending of the second stator core holding member during assembly of the stator.

  A stator according to a ninth aspect is the stator according to any one of the first to eighth aspects, wherein the stator core is formed by laminating electromagnetic steel plates formed in a plate shape.

  By the way, in a stator core in which the number of laminated electromagnetic steel sheets is reduced in order to reduce the size of the motor in the axial direction, when the cylindrical portion of the first stator core holding member is press-fitted into the annular portion of the stator core, the stator core is It is easy to incline against. However, in the present invention according to claim 9, the stator core is sandwiched between the first stator core holding member and the second stator core holding member, so that the inclination of the stator core with respect to the cylindrical portion can be suppressed. .

  A motor according to a tenth aspect is rotatably supported by the stator according to any one of the first to ninth aspects, a bearing member fixed to the cylindrical portion, and the bearing member. And a rotor that rotates in response to a magnetic field generated by the stator.

  According to the motor of the tenth aspect, by suppressing the inclination of the stator core with respect to the cylindrical portion, it is possible to suppress the generation of abnormal noise during the operation of the motor.

It is a disassembled perspective view which decomposes | disassembles and shows a brushless motor. It is a plane sectional view showing a stator and a rotor. It is a sectional side view which shows the cross section of the brushless motor cut | disconnected along the line corresponding to CC line shown by FIG. It is an expanded sectional side view which expands and shows the site | part pinched between the 1st control part of a holder bearing and the 2nd control part of a stator cover in a stator core. It is a top view which shows the stator cover which concerns on a modification.

  A brushless motor according to an embodiment of the present invention will be described with reference to FIGS. In addition, the arrow Z direction, the arrow R direction, and the arrow C direction that are appropriately shown in the drawing indicate the axial direction, radial direction, and circumferential direction of the brushless motor, respectively. In the following description, when only the axial direction, the radial direction, and the circumferential direction are indicated, the axial direction, radial direction, and circumferential direction of the brushless motor are indicated unless otherwise specified.

  As shown in FIG. 1, the brushless motor 10 as a motor according to the present embodiment includes a rotor 12, a stator 14, a motor holder 16, and a cover 18.

(Configuration of rotor 12)
The rotor 12 includes a rotor housing 20 and a shaft 22 and a rotor magnet 24 fixed to the rotor housing 20. The rotor housing 20 is formed in a cylindrical shape, and the rotor housing 20 is bent in the axial direction from the top wall portion 26 formed in a substantially disc shape and the radially outer end of the top wall portion 26. And a cylindrical portion 28 extending as a result. A shaft 22 is fixed to the center of the top wall portion 26 of the rotor housing 20 by press-fitting. A rotor magnet 24 is fixed to the inner peripheral surface of the cylindrical portion 28 of the rotor housing 20. The rotor magnet 24 is a ring magnet formed in a cylindrical shape. The rotor magnet 24 includes an N-pole magnet portion having an N-pole on the circumferential inner surface and an S-pole on the circumferential inner surface. The S pole magnet portions thus formed are alternately magnetized along the circumferential direction.

(Configuration of stator 14)
As shown in FIG. 1 and FIG. 2, the stator 14 includes a stator core 30 formed by laminating and integrating electromagnetic steel sheets punched into a predetermined shape in the axial direction, and the main of each of the stator cores 30. And a coil 34 formed by winding a conductive winding 32 around the tooth portion 44. Further, the stator 14 includes a stator base 36 and a stator cover 38 as a first stator core holding member and a second stator core holding member that hold the stator core 30.

  The stator core 30 is formed by an annular portion 42 having a circular press-fit hole 40 in an axial center portion, and a radial winding extending from the annular portion 42 toward the outside in the radial direction, and a conductive winding is wound. Six main teeth portions 44 as teeth portions around which coils are formed, and six sub teeth portions as teeth portions that extend radially outward from the annular portion 42 and have no coils formed around them. 46. The main teeth portion 44 includes a winding portion 48 that extends in the radial direction and the winding 32 is wound thereon, and a main teeth tip portion 50 that extends in the circumferential direction from the radially outer end of the winding portion 48. By having it, it is formed in a substantially T shape when viewed in the axial direction. Further, the six main teeth portions 44 are arranged at equal intervals along the circumferential direction. Further, the sub-teeth portion 46 has an axially extending portion 52 that extends in the axial direction, and extends from the radially outer end of the axially extending portion 52 in the circumferential direction and has a circumferential width dimension that is the main of the main teeth portion 44. By having a sub-tooth tip 54 set smaller than the circumferential width dimension of the tooth tip 50, the tooth tip 50 is formed in a substantially T-shape when viewed in the axial direction. Further, the sub teeth portions 46 are arranged between the main teeth portions 44 and are arranged at equal intervals along the circumferential direction.

  As shown in FIGS. 1 and 3, the stator base 36 is fixed with a pair of bearings 56 as bearing members that support an intermediate portion in the axial direction of the shaft 22, and the stator core 30 is fixed to the outer peripheral portion by press-fitting. The bearing holder part 58 as a cylindrical part and a flange part 60 extending in the radial direction from the other axial end of the bearing holder part 58 are provided.

  The bearing holder portion 58 is formed in a cylindrical shape through which the shaft 22 is inserted, and a pair of bearings 56 arranged at intervals in the axial direction are fixed to the inner peripheral portion of the bearing holder portion 58 by press fitting. Has been. Further, the other axial side portion of the outer peripheral portion of the bearing holder portion 58 is a stator core press-fit fixing portion 62 to which the annular portion 42 of the stator core 30 is fixed by press-fitting. The stator core press-fit fixing portion 62 is formed with a plurality of centering portions 64 that are formed in a convex shape toward the radially outer side and are formed in a rectangular shape with the axial direction as the longitudinal direction when viewed from the radially outer side. (In this embodiment, three centering portions 64 are formed). Moreover, the several centering part 64 is arrange | positioned at equal intervals along the circumferential direction. The annular portion 42 of the stator core 30 is press-fitted into the stator core press-fit fixing portion 62 so that the inner peripheral surface of the annular portion 42 of the stator core 30 and the radially outer surface of the centering portion 64 come into close contact with each other. Yes. In addition, the inner peripheral surface of the annular portion 42 of the stator core 30 and the radially outer surface of the centering portion 64 are in contact with each other so that the stator core 30 is centered with respect to the bearing holder portion 58. Furthermore, in this embodiment, the fitting force between the annular portion 42 of the stator core 30 and the bearing holder portion 58 is adjusted by adjusting the shapes and the like of the plurality of centering portions 64.

  In addition, a portion on one axial side of the outer peripheral portion of the bearing holder portion 58 is a stator cover press-fit fixing portion 66 to which a stator cover 38 described later is fixed by press-fitting.

  The flange portion 60 includes a disc portion 68 formed in a disc shape, and three tongue pieces that extend from the outer peripheral portion of the disc portion 68 toward the radially outer side and are equally spaced along the circumferential direction. 70. Each of the three tongue pieces 70 is provided with a first restricting portion 72 that protrudes from the surface on one side in the axial direction of the tongue piece 70 toward the one side in the axial direction. The three first restricting portions 72 are formed in a cylindrical shape having a flat surface on one side in the axial direction, and are arranged at equal intervals along the circumferential direction. When the annular portion 42 of the stator core 30 is press-fitted into the bearing holder portion 58, as shown in FIGS. 2 to 4, the surface on the other side in the axial direction of the sub-tooth portion 46 is the first restricting portion 72. This is in contact with the surface 72A on one side in the axial direction. Thereby, the inclination with respect to the stator base 36 of the stator core 30 is suppressed. In the present embodiment, the three first restricting portions 72 abut each of the three sub-tooth portions 46 arranged at intervals of 120 deg along the circumferential direction among the six sub-tooth portions 46. It is like that. Moreover, in this embodiment, the three 1st control parts 72 contact | abut to the edge part on the side spaced apart from the cyclic | annular part 42 in the sub teeth part 46. As shown in FIG.

  A motor holder 16 that supports the stator base 36 is provided between the stator base 36 and the cover 18 described above. The motor holder 16 is formed in a disk shape whose axial direction is the thickness direction, and the shaft center part of the motor holder 16 has the shape of the outer edge of the disk part 68 and the tongue piece part 70 of the stator base 36. A support hole 74 is formed as an inner edge. The disk portion 68 and the tongue piece portion 70 of the stator base 36 are disposed in the support hole 74, so that the position of the stator base 36 in the circumferential direction with respect to the motor holder 16 is regulated.

  As shown in FIGS. 1 and 3, the stator cover 38 is provided on the opposite side of the stator core 30 from the side on which the flange portion 60 of the stator base 36 is disposed. A disk portion 76 formed in a plate shape is provided. A circular press-fitting hole 78 into which a stator cover press-fitting fixing part 66 provided in the stator base 36 is press-fitted is formed at the axial center of the disc part 76. Further, the disk portion 76 is provided with three second restricting portions 80 that protrude from the surface on the other side in the axial direction of the disk portion 76 toward the other side in the axial direction. The three second restricting portions 80 are formed in a cylindrical shape having the same direction as the axial direction of the brushless motor 10 as the axial direction, and are arranged at equal intervals along the circumferential direction. In the present embodiment, in the state where the stator cover 38 is fixed to the stator base 36, the three second restricting portions 80 and the three first restricting portions 72 of the stator base 36 are located at the same positions in the circumferential direction and the radial direction. It is supposed to be located in.

  As shown in FIGS. 3 and 4, the second restricting portion 80 is formed in a convex shape from the radial center of the second restricting portion 80 toward the other side in the axial direction, and in the protruding direction. The crushing protrusion 82 is provided as a deformable portion having a substantially spherical end. When the stator cover 38 is moved to the other side in the axial direction and the stator cover press-fit fixing portion 66 provided in the stator base 36 is press-fitted into the press-fit hole 78 of the stator cover 38, the shaft of the sub-tooth portion 46 is The crushing protrusions 82 of the second restricting portions 80 come into contact with the surface on one side in the direction. As a result, the stator core 30 is sandwiched between the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38. As a result, the inclination of the stator core 30 with respect to the stator base 36 is suppressed.

  In the present embodiment, the stator cover 38 is excessively pressed in the other axial direction in a state where the crushing protrusions 82 of the second restricting portions 80 are in contact with the surface on the one axial side of the sub-tooth portion 46. Then, the crushing protrusion 82 is crushed (plastically deformed).

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  As shown in FIGS. 1 to 3, in the brushless motor 10 of the present embodiment, the energization of each coil 34 of the stator 14 is switched by a control device (not shown), whereby a rotating magnetic field is generated in the stator 14. And the rotor 12 rotates in response to the rotating magnetic field.

  Here, in the present embodiment, the stator core 30 is held on the stator base 36 by press-fitting the bearing holder portion 58 of the stator base 36 into the annular portion 42 of the stator core. Further, the first restricting portion 72 provided on the flange portion 60 of the stator base 36 abuts against the surface on the other axial side of the sub-tooth portion 46 of the stator core 30, so that the inclination of the stator core 30 with respect to the bearing holder portion 58 is inclined. It is suppressed. Further, the second restricting portion 80 (the crushing protrusion portion 82) of the stator cover 38 abuts against the surface on one side in the axial direction of the sub-tooth portion 46 of the stator core 30, so that the inclination of the stator core 30 with respect to the bearing holder portion 58 is restricted. Has been. That is, in the present embodiment, the stator core 30 is sandwiched between the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38, thereby suppressing the inclination of the stator core 30 with respect to the bearing holder portion 58. can do. Thereby, generation | occurrence | production of the abnormal noise at the time of the action | operation of the brushless motor 10 can be suppressed.

  In the present embodiment, the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38 are formed in a convex shape toward the stator core 30 side. In addition, the second restricting portion 80 can be easily brought into contact with a desired position of the stator core 30. Thereby, the precision of the inclination with respect to the bearing holder part 58 of the stator core 30 can be improved.

  Furthermore, in the present embodiment, according to the stator 14, since the centering portion 64 is formed on the outer peripheral surface of the bearing holder portion 58, when the bearing holder portion 58 is press-fitted into the annular portion 42 of the stator core 30, The stator core 30 and the bearing holder portion 58 can be easily centered.

  In the present embodiment, the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38 are brought into contact with the end portion on the side away from the annular portion 42 in the sub-tooth portion 46. The accuracy of the inclination with respect to the bearing holder part 58 of the stator core 30 can be improved.

  Further, in the present embodiment, the first restricting portion 72 is brought into contact with the sub-tooth portion 46 where the coil 34 is not formed by bringing the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38 into contact with each other. And the contact area between the stator core 30 and the contact area between the second restricting portion 80 and the stator core 30 can be easily secured. Thereby, the stator cover 38 is pressed toward the stator core 30 side, and a sufficient area for deforming the crushing protrusion 82 of the second restricting portion 80 can be secured. As a result, by deforming the crushing protrusion 82 and holding the stator core 30, it is possible to suppress unintended bending of the disc portion 76 of the stator cover 38 and the like when the stator 14 is assembled. Further, if the first restriction portion 72 of the data base 36 and the second restriction portion 80 of the stator cover 38 are to be brought into contact with the main teeth tip portion 50, it is necessary to change the shape of the insulator in the radial tip side in a complicated manner. is there. However, when the sub teeth 46 are brought into contact with each other, no coil is formed around the sub teeth 46, so that it is not necessary to cover the sub teeth 46 with an insulator (not shown). Therefore, the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38 can be easily brought into contact with the sub-tooth portion 46 without forming the insulator in a complicated shape.

  Further, in the present embodiment, the stator core 30 and the first restricting portion 72 are arranged by arranging the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38 at equal intervals along the circumferential direction. It can be sandwiched between the second restricting portion 80 and the balance. In addition to this, in the present embodiment, the three first restricting portions 72 and the three second restricting portions 80 are arranged at the same positions in the circumferential direction and the radial direction. As a result, the stator core 30 can be sandwiched between the first restricting portion 72 and the second restricting portion 80 in a more balanced manner. Thereby, the inclination with respect to the bearing holder part 58 of the stator core 30 can be suppressed further.

  By the way, in the stator core 30 in which the number of laminated electromagnetic steel sheets is reduced in order to reduce the size of the brushless motor 10 in the axial direction, when the bearing holder portion 58 of the stator base 36 is press-fitted into the annular portion 42 of the stator core, the stator core 30. Is easy to tilt with respect to the bearing holder portion 58. However, in the present embodiment, the stator core 30 is sandwiched between the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38, so that the stator core 30 is supported with respect to the bearing holder portion 58. Tilt can be suppressed. Thereby, generation | occurrence | production of the noise in the action | operation of the said brushless motor 10 can be suppressed, achieving size reduction of the brushless motor 10 in the axial direction.

  Further, in the stator 14 of the present embodiment, the stator core 30 is sandwiched between the first restricting portion 72 of the stator base 36 and the second restricting portion 80 of the stator cover 38. By the way, in order to hold the stator core on the stator base, there is a configuration in which the annular portion of the stator core is entirely press-fitted into a bearing holder portion provided on the stator base. On the other hand, in the present embodiment, the stator core 30 is sandwiched between the first restricting portion 72 and the second restricting portion 80, so that it is possible to change to partial press-fitting by the centering portion 64. Accuracy can be improved.

  In addition, although this embodiment demonstrated the example which formed the stator core 30 by laminating | stacking and integrating an electromagnetic steel plate, this invention is not limited to this. Moreover, although this embodiment demonstrated the example which comprised the stator 14 and the brushless motor 10 using the stator core 30 which has the main teeth part 44 around which the coil 34 is formed, and the sub teeth part 46 in which a coil is not formed. However, the present invention is not limited to this. For example, by machining a magnetic metal, a stator and a brushless motor can be configured using a stator core having only a teeth portion around which a coil 34 is formed.

  Moreover, although this embodiment demonstrated the example which has arrange | positioned three 1st control parts 72 and three 2nd control parts 80 in the same position of the circumferential direction and radial direction, this invention is not limited to this. The arrangement of the first restricting portion 72 and the second restricting portion 80 may be appropriately set in consideration of the shape of the stator core 30 and the like.

  Furthermore, although this embodiment demonstrated the example which provided the crushing protrusion part 82 in the front-end | tip part of the 2nd control part 80, this invention is not limited to this. Whether or not the crushing protrusion 82 is provided at the tip of the second restricting portion 80 may be set as appropriate in consideration of the rigidity of the disc portion 76 of the stator cover 38.

  In the present embodiment, the example in which the first restriction portion 72 of the stator base 36 and the second restriction portion 80 of the stator cover 38 are brought into contact with the sub-tooth portion 46 where the coil 34 is not formed has been described. The invention is not limited to this. For example, the inclination of the stator core 30 relative to the bearing holder portion 58 may be suppressed by bringing the first restriction portion 72 of the stator base 36 and the second restriction portion 80 of the stator cover 38 into contact with the main teeth tip portion 50.

  Furthermore, although this embodiment demonstrated the example which provided the centering part 64 in the outer peripheral surface of the bearing holder part 58, this invention is not limited to this. Whether or not the centering portion 64 is provided may be set as appropriate in consideration of the required coaxiality between the bearing holder portion 58 and the stator core 30.

  Further, in the present embodiment, the example in which the stator 14 is configured by using the stator cover 38 in which the second restricting portion 80 is erected in the shape of the disc portion 76 formed in the disc shape has been described. It is not limited to this. For example, as shown in FIG. 5, it has a plurality of plate-like portions 84 that extend radially outward in the radial direction and are equally spaced along the circumferential direction. 2 A stator can also be constituted by using a stator cover 86 as a second stator core holding member in which the restricting portion 80 is erected.

  Furthermore, in this embodiment, although the example which supported the stator base 36 on the motor holder 16 was demonstrated, this invention is not limited to this. For example, the stator base 36 and the motor holder 16 can be configured as one member.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

DESCRIPTION OF SYMBOLS 10 ... Brushless motor (motor), 12 ... Rotor, 14 ... Stator, 30 ... Stator core, 34 ... Coil, 36 ... Stator base (first stator core holding member), 38 .... Stator cover (second stator core holding member), 42 ... annular part, 44 ... main teeth part (teeth part), 46 ... sub teeth part (tooth part), 56 ... bearing (bearing) Member), 58... Bearing holder portion (tubular portion), 60... Flange portion, 64... Centering portion, 72. ... Crushing projection (deformable part), 86 ... Stator cover (second stator core holding member)

Claims (10)

A stator core having an annular portion formed in an annular shape and a tooth portion extending in a radial direction from the annular portion;
A first stator core holding member that is formed in a cylindrical shape and has a cylindrical portion that is press-fitted into the annular portion; and a flange portion that extends radially outward from an end portion on one side of the cylindrical portion; ,
The stator core is provided on a side opposite to the side where the flange portion is disposed and is fixed to the cylindrical portion, and the stator core is sandwiched between the stator core holding member and the stator core. A second stator core holding member that restricts inclination with respect to the tubular portion;
With a stator. A stator core having an annular portion formed in an annular shape and a tooth portion extending in a radial direction from the annular portion;
A cylindrical portion that is formed into a cylindrical shape and is press-fitted into the annular portion; a flange portion that extends radially outward from an end portion on one side of the cylindrical portion; A first stator core holding member having a first restricting portion that restricts the inclination of the stator core with respect to the cylindrical portion by contacting the stator core;
The stator core is provided on a side opposite to the side on which the flange portion is disposed, and contacts the surface of the stator core opposite to the surface on which the first restricting portion is in contact. A second stator core holding member having a second restricting portion for restricting the inclination with respect to the tubular portion;
With a stator.   The stator according to claim 2, wherein the first restriction portion and the second restriction portion are formed in a convex shape toward the stator core side.   The center part which is convexly formed toward the radial direction outer side and is arranged at equal intervals along the circumferential direction is formed on the radially outer surface of the cylindrical part. The stator according to claim 3.   The at least one of the said 1st control part and the said 2nd control part is contact | abutting to the edge part on the opposite side to the said cyclic | annular part in the said teeth part. Stator. The teeth portion is a main teeth portion around which a coil is formed and a sub teeth portion around which the coil is not formed,
The stator according to any one of claims 2 to 5, wherein the first restricting portion and the second restricting portion are in contact with the sub-tooth portion.   The stator according to any one of claims 2 to 6, wherein the first restricting portion and the second restricting portion are arranged at equal intervals along a circumferential direction.   The second restricting portion is provided with a deformable portion that is formed in a convex shape toward the stator core side and is deformed by pressing the second stator core holding member toward the stator core side. The stator according to any one of claims 2 to 7.   The stator according to any one of claims 1 to 8, wherein the stator core is formed by laminating electromagnetic steel plates formed in a plate shape. A stator according to any one of claims 1 to 9,
A bearing member fixed to the tubular portion;
A rotor that is rotatably supported by the bearing member and that rotates by receiving a magnetic field generated by the stator.
With motor.

Images