JP5858728B2 - Disk rotation motor and disk drive apparatus provided with the same - Google Patents

Description

  The present invention relates to a disk rotation motor and a disk drive device including the same, and more particularly to a disk rotation motor that can be manufactured by a simple method and a disk drive device including the same.

  When recording or reading information on a recording medium on which information such as an optical disk or a magneto-optical disk is recorded, the disk is rotated using a disk drive device. The disk drive device includes a disk rotation motor for rotating the disk. A technique related to a conventional disk rotation motor is disclosed in, for example, Patent Document 1 below.

  In Patent Document 1 below, a shaft, an impeller formed by insert molding on the shaft, a sleeve that constitutes a sliding bearing together with the shaft, a bearing holding portion in which the sleeve is press-fitted and fixed, and an outer peripheral side surface of the bearing holding portion are fixed. A blower fan including a stator is disclosed. The stator includes a stator core, an insulator, and a coil wound around the stator core via the insulator. The inner diameter side end portion of the insulator includes a protruding portion that protrudes toward the impeller beyond the bearing holding portion. The large diameter portion of the impeller is hooked in the axial direction on the protruding portion of the insulator, so that the shaft is prevented from coming off the sleeve.

JP 2007-236189 A

  In recent years, there has been a strong demand for lower prices for disk rotation motors. In order to reduce the price of the disk rotation motor, it is necessary to manufacture the disk rotation motor by a simple method. For example, the number of parts of a disk rotation motor can be reduced, or the method of processing the parts that make up a disk rotation motor can be compared to a press process rather than a relatively complicated (expensive) method such as cutting. It is necessary to use a simple (inexpensive) method. Furthermore, when assembling the parts, it is necessary to adopt a relatively easy (inexpensive) fastening method represented by press-fitting instead of a complicated fastening method, and to maintain assembly accuracy. The conventional technology has room for further improvement in terms of simplifying the manufacturing method. In particular, in Patent Document 1, since the insulator has a configuration protruding toward the impeller beyond the bearing holding portion, the shape of the insulator is complicated.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a disk rotation motor that can be manufactured by a simple method and a disk drive device including the same.

A disk rotating motor according to one aspect of the present invention includes a rotating shaft, a bearing that rotatably supports the rotating shaft on an outer diameter side of the rotating shaft, and a stator that fixes the bearing, and the stator has an outer periphery of the bearing. A stator core attached to the surface, a coil wound around the stator core, and an insulator that insulates the stator core and the coil from each other, the rotating shaft includes a groove formed on an outer peripheral surface of the rotating shaft, and the insulator includes the groove The engaging portion is formed at an inner diameter side end portion of the insulator, and the insulator is formed between the insulator main body formed between the stator core and the coil, and the insulator main body and the engaging portion. An extension part extending along the extension direction of the rotating shaft, and the bearing is a concave part recessed toward the inner diameter side at the end part of the outer peripheral surface of the bearing, and the extension part It includes a recess for engaging.

  In the disk rotating motor, preferably, the engaging portion includes a curved chamfered portion formed at a boundary between one surface of the engaging portion and an inner diameter side end surface of the engaging portion, and the other of the engaging portions. And the corner portion formed at the boundary between the inner surface and the inner diameter side end surface of the engaging portion, and the radius of curvature of the chamfered portion is larger than the radius of curvature of the corner portion.

  Preferably, the disk rotating motor further includes a bracket that supports one end of the rotating shaft, and the groove is formed at a position between the bearing and the bracket.

  Preferably, in the disk rotating motor, the stator core includes first and second plates stacked along the extending direction of the rotating shaft, and the first plate is formed along the extending direction of the rotating shaft. And a bent portion that is bent from the stacked portion toward the second plate on the inner diameter side of the stacked portion and that is in contact with the outer peripheral surface of the bearing.

  A disk drive device according to another aspect of the present invention includes the above-described disk rotation motor and a control unit that controls the drive state of the disk rotation motor.

  ADVANTAGE OF THE INVENTION According to this invention, the disk rotation motor which can be manufactured by a simple method, and the disk drive device provided with the same can be provided.

1 is a block diagram showing a configuration of a disk drive device according to an embodiment of the present invention. It is a bottom view which shows typically the structure of the disk rotation motor in one embodiment of this invention. It is a cross-sectional perspective view which follows the IV-IV line of FIG. It is sectional drawing which follows the IV-IV line of FIG. FIG. 3 is a perspective view showing a configuration of an insulator 26 when viewed from the side facing the rotor 10. It is a perspective view which shows the structure of the insulator 26 at the time of seeing from the side which faces the bracket 23. FIG. FIG. 5 is a perspective view showing a configuration of a plate 52 or 53 when viewed from the side facing the rotor 10. FIG. 3 is a perspective view showing a configuration of a bracket 23 when viewed from the side facing the rotor 10. It is a perspective view which shows the 1st process of the manufacturing method of the disk rotation motor in one embodiment of this invention, and is the perspective view at the time of seeing the obtained stator core 21 from the side which faces the rotor 10. FIG. It is a perspective view which shows the 1st process of the manufacturing method of the disk rotation motor in one embodiment of this invention, and is a perspective view at the time of seeing the obtained stator core 21 from the side which faces the bracket 23. FIG. It is a perspective view which shows the 2nd process of the manufacturing method of the disk rotation motor in one embodiment of this invention, and is the perspective view at the time of seeing the winding assembly obtained from the side which faces the rotor 10 is there. It is a perspective view which shows the 2nd process of the manufacturing method of the disk rotation motor in one embodiment of this invention, and is the perspective view at the time of seeing the winding assembly obtained from the side which faces the bracket 23. is there. It is a perspective view which shows the 3rd process of the manufacturing method of the disk rotation motor in one embodiment of this invention. It is a perspective view which shows the 4th process of the manufacturing method of the disk rotation motor in one embodiment of this invention. It is a perspective view which shows the 5th process of the manufacturing method of the disk rotation motor in one embodiment of this invention. It is sectional drawing which shows typically the structure of the retaining washer part 26a vicinity in the disk rotation motor of the 1st modification of this invention. It is sectional drawing which shows typically the structure of the disk rotation motor in the 2nd modification of this invention. FIG. 3 is a perspective view showing a configuration of a plate 51 when viewed from the side facing the rotor 10. It is a perspective view which shows the structure of the plate 51 at the time of seeing from the side which faces the bracket 23. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the following description, “outer diameter side” means the outer diameter side when the rotation axis of the disk rotation motor is centered, and “inner diameter side” means the rotation axis of the disk rotation motor. It means the inner diameter side when it is the center. The “outer peripheral surface” means the outer peripheral surface when the rotation axis of the disk rotation motor is centered, and the “inner peripheral surface” is the inner periphery when the rotation axis of the disk rotation motor is the center. It means the circumference.

  FIG. 1 is a block diagram showing a configuration of a disk drive device according to an embodiment of the present invention.

  Referring to FIG. 1, the disk drive apparatus according to the present embodiment includes a motor 100 as a disk rotation motor and a control unit 200 that controls the drive state of the motor 100 such as on / off and rotation speed.

  2 to 4 are diagrams schematically showing the configuration of the disk rotation motor in one embodiment of the present invention. 2 is a bottom view, FIG. 3 is a sectional perspective view taken along line IV-IV in FIG. 2, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

  2 to 4, the motor 100 mainly includes a rotor 10, a stator 20, and a bearing 30. The rotor 10 is rotatable with respect to the stator 20. The bearing 30 supports the rotor 10 so as to be rotatable with respect to the stator 20.

  The rotor 10 includes a rotor frame 11, a magnet 12, and a shaft 13 that is a rotating shaft. The rotor frame 11 prevents leakage of the magnetic field from the inside of the rotor frame 11, and is made of, for example, a magnetic material. The rotor frame 11 includes a turntable portion 11a and a side wall portion 11b. The turntable portion 11a extends, for example, in a direction (lateral direction in FIG. 4) perpendicular to the extending direction of the shaft 13 (hereinafter sometimes referred to as the axial direction). The turntable portion 11a has a circular shape when seen in a plan view. A hole 60 for passing the shaft 13 is provided at the center of the turntable portion 11 a, and the rotor frame 11 is fixed to the shaft 13 at the hole 60. The side wall part 11b extends from the outer diameter side end part of the turntable part 11a toward the bracket 23 of the stator 20 (downward in FIG. 4). The side wall part 11b has a cylindrical shape.

  The magnet 12 is attached to the inner peripheral surface of the side wall portion 11b. The magnet 12 has an annular shape, and regions magnetized in the N pole and regions magnetized in the S pole are alternately provided at regular intervals along the circumferential direction. The magnet 12 is attached to the rotor frame 11 so as to face the stator 20.

  The shaft 13 extends in the longitudinal direction in FIG. 4 so as to penetrate the central portion of the rotor frame 11. The rotor frame 11 can rotate with the shaft 13 about the shaft 13. The shaft 13 is rotatably supported by a bearing 30 disposed on the outer diameter side of the shaft 13. The shaft 13 includes a groove 13a formed on the outer peripheral surface near the lower end in FIG. The groove 13 a is formed at a position between the bearing 30 and the bracket 23.

  The stator 20 includes a stator core 21 (core), a stator coil 22, a bracket 23, a bottom plate 24, a thrust plate 25, and insulators 26 and 27. The stator core 21 is attached to the outer peripheral surface of the bearing 30 and is fixed to the bracket 23 by, for example, burring caulking. Stator core 21 includes a plurality of teeth 21a formed to extend radially from the inner diameter side toward the outer diameter side. The stator coil 22 is wound around each of the plurality of tooth portions 21a. The bottom plate 24 is made of a magnetic material, for example, and is fixed to a surface of the bracket 23 on the rotor 10 side. The thrust plate 25 is circular, for example, and includes a contact surface that contacts the lower end of the shaft 13 in FIG. The thrust plate 25 receives a load in the thrust direction of the shaft 13.

  The stator core 21 has holes 21b (core center holes) formed in the center thereof and holes 21c (periphery) formed at a plurality of positions (for example, three locations) on the circumference centered on the holes 21b. Through-hole). Each of the hole 21b and the hole 21c penetrates the stator core 21 in the axial direction. A bearing 30 is press-fitted into the hole 21 b, and thereby the bearing 30 is fixed to the stator core 21.

  The stator core 21 has a structure in which a plurality of plates are laminated in the axial direction. Stator core 21 is constituted by a plate (laminated core) having two types of shapes, for example, plates 52 and 53. Each of the plates 52 and 53 is in contact with each other, and is laminated in this order along the axial direction from the rotor frame 11 side (upper side in FIG. 4) to the bracket 23 side (lower side in FIG. 4). . The number of each of the plates 52 and 53 is arbitrary.

  Insulators 26 and 27 insulate stator core 21 and stator coil 22 from each other. The insulators 26 and 27 are formed so as to cover the entire surface of the stator core 21. The insulator 26 covers the lower part of the stator core 21 in FIG. The insulator 27 covers the upper part of the stator core 21 in FIG. Each of the stator coils 22 is wound around the plurality of teeth portions 21a (core salient poles) with the insulator 26 or 27 interposed therebetween. The insulators 26 and 27 are preferably made of a flexible material such as a resin material.

  The bearing 30 is made of, for example, a porous material containing metal oil. The bearing 30 includes a recess 30a that is recessed toward the inner diameter side at the lower end in FIG. 4 on the outer peripheral surface.

  The motor 100 further includes an alignment member 41 and a cushion rubber 42. The turntable portion 11a has an inner diameter side end portion 11c bent upward in FIG. The alignment member 41 is fixed to the outer peripheral surface of the inner diameter side end portion 11c. A spring (not shown) is provided between the alignment member 41 and the inner diameter side end portion 11c, and the alignment member 41 is biased in the outer diameter direction. The cushion rubber 42 is disposed on the upper surface of the turntable portion 11a in FIG. When the disk 80 is set in the disk drive device, the disk 80 is disposed on the cushion rubber 42 so that the hole 80 a at the center thereof is fitted into the alignment member 41. The alignment member 41 fixes the disk 80 by pressing the inner peripheral surface of the hole 80a of the disk 80 by the action of a spring. The cushion rubber 42 suppresses the vibration of the disk 80 in the vertical direction in FIG.

  5 and 6 are perspective views showing the configuration of the insulator 26. FIG. 5 is a view when viewed from the side facing the rotor 10, and FIG. 6 is a view when viewed from the side facing the bracket 23.

  4 to 6, the insulator 26 includes a retaining washer 26a (an example of an engaging part), a bearing engaging part 26b (an example of an extending part), an inner diameter part 26c, and a plurality of teeth. A portion 26d (an example of an insulator body), a core covering portion 26e, and a partition portion 26f are included. Each of the retaining washer part 26a, the bearing engaging part 26b, the inner diameter part 26c, the plurality of tooth parts 26d, the core covering part 26e, and the partition part 26f is integrally formed.

  The retaining washer 26a is provided at the inner diameter side end of the insulator 26 and protrudes toward the inner diameter side. The retaining washer portion 26 a is engaged with the groove 13 a of the shaft 13. The retaining washer portion 26a prevents the shaft 13 from slipping upward in FIG.

  The bearing engaging portion 26b is formed between the outer diameter side end portion of the retaining washer portion 26a and the inner diameter side end portion of the inner diameter portion 26c, and extends downward in FIG. 4 along the axial direction from the inner diameter portion 26c. It extends to. The bearing engaging portion 26b is engaged with the recess 30a together with a part of the retaining washer portion 26a.

  The inner diameter portion 26c has a circular shape and extends in the outer diameter direction from the upper end portion in FIG. 4 of the bearing engagement portion 26b. A plurality of holes 21 c are formed in the inner diameter portion 26 c at positions that are internally compatible with the holes 21 c formed in the plates 52 and 53.

  Each of the plurality of tooth portions 26d is formed to extend radially from the inner diameter portion 26c toward the outer diameter side. Each of the plurality of tooth portions 26d has a shape corresponding to each of the plurality of tooth portions 21a of the stator core 21, and covers the lower surfaces of the plurality of tooth portions 21a in FIG. Each of the plurality of tooth portions 26 d is formed between the stator core 21 and the stator coil 22.

  The core covering portion 26e extends upward in FIG. 4 from the circumferential end portion of each of the plurality of tooth portions 26d. The core covering portion 26e covers the circumferential side surface of each of the plurality of tooth portions 26d.

  The partition portion 26f has an annular shape, and protrudes downward in FIG. 4 at the boundary between the inner diameter portion 26c and the plurality of tooth portions 26d.

  The insulator 27 has members corresponding to the plurality of tooth portions 26d, the core covering portion 26e, and the partition portion 26f in the insulator 26, and the retaining washer portion 26a, the bearing engaging portion 26b, and the like in the insulator 26, There is no member corresponding to the inner diameter part 26c.

  FIG. 7 is a perspective view showing the configuration of the plate 52 or 53 when viewed from the side facing the rotor 10.

  4 and 7, plates 52 (cores with large through holes) and 53 (cores with small through holes) have a flat plate shape and are laminated to each other along the axial direction. The plate 52 has a plurality of teeth 21a, holes 21b, and holes 21c. A plurality of teeth portions 21a and holes 21b and 21c are formed in the plate 53. The hole 21c in the plate 52 has a diameter d1, and the hole 21c in the plate 53 has a diameter d2. The diameter d2 is smaller than the diameter d1. The diameter d1 is slightly larger than the diameter of the burring portion 23d of the bracket 23. The diameter d2 is large enough to allow the burring portion 23d of the bracket 23 and the hole 21c of the plate 53 to engage with each other.

  FIG. 8 is a perspective view showing the configuration of the bracket 23 when viewed from the side facing the rotor 10.

  4 and 8, the bracket 23 includes a first bottom 23a, a second bottom 23b, a third bottom 23c, a burring portion 23d, an outer edge 23e, and the like. The first to third bottom portions 23 a to 23 c are formed at the center portion of the bracket 23, and support the lower end portion of the shaft 13 in FIG. 4. The first bottom portion 23a is at a position closest to the lower end portion in FIG. 4 of the shaft 13 in the bracket 23, and extends in the lateral direction in FIG. The second bottom portion 23b extends in the axial direction between the outer diameter side end portion of the first bottom portion 23a and the inner diameter side end portion of the third bottom portion 23c. The third bottom 23c extends in the lateral direction in FIG. 4 from the upper end of the second bottom 23b. The outer edge portion 23e extends from the outer diameter side end portion of the third bottom portion 23c to a position on the outer diameter side of the outer diameter side end portion of the stator core 21. Holes are formed at equal intervals in a plurality of positions (for example, three locations) on the circumference around the first bottom 23a in the outer edge 23e, and burring portions 23d are formed around each hole. Yes. The burring portion 23d is formed at a position corresponding to the hole 21c. Each of the burring portions 23d extends in a direction (upward direction in FIG. 4) from the outer edge portion 23e toward the stator core 21.

  The first bottom portion 23 a comes into contact with the thrust plate 25 on the surface opposite to the contact surface with the shaft 13 in the thrust plate 25. The second bottom 23 b surrounds the outer periphery of the thrust plate 25. A bottom plate 24 is formed on the outer edge portion 23e. The burring portion 23 d is inserted into the hole 21 c of the plate 53. The upper end portion of the burring portion 23 d is deformed in the outer diameter direction of the hole 21 c of the plate 53. Thereby, the stator core 21 is directly fastened to the bracket 23.

  The motor 100 may further include an attraction magnet (not shown) that stabilizes the position of the rotor 10 in the axial direction by attracting the rotor 10 magnetically. The attraction magnet may be fixed to the outer peripheral surface of the bearing 30 so as to be in contact with the plate 52 of the stator core 21, for example.

  The inner wall surface of the stator core 21 that comes into contact with the bearing 30 is preferably subjected to an insulation treatment and an oilproof treatment. In particular, by applying an oilproof treatment to the inner wall surface of the stator core 21, it is possible to prevent the metal oil contained in the bearing 30 from penetrating into the plates 52 and 53 due to capillary action.

  Next, an example of a method for manufacturing the disk rotation motor in the present embodiment will be described with reference to FIGS. In FIGS. 13 and 14, the bearing 30 is illustrated in a simplified manner, and the recess 30 a is not illustrated.

  Referring to FIGS. 9 and 10, first, plates 52 and 53 are manufactured by performing plastic working such as press working on one metal flat plate, for example. Next, the stator core 21 is produced by laminating the plates 52 and 53.

  Referring to FIGS. 11 and 12, next, after covering stator core 21 with insulators 26 and 27, stator coil 22 is wound around each of a plurality of tooth portions 21 a of stator core 21. Thereby, a winding assembly is obtained.

  Referring to FIG. 13, subsequently, each of the holes 21 c of the stator core 21 is fitted into each of the burring portions 23 d of the bracket 23 as indicated by an arrow A <b> 1. Then, the winding assembly is mounted on the bracket 23 by caulking each of the burring portions 23d.

  Referring to FIG. 14, subsequently, as indicated by an arrow A <b> 2, the bearing 30 is inserted into the hole 21 b of the stator core 21, and the bearing 30 is press-fitted and fixed to the stator core 21.

  Thereafter, the end of the stator coil 22 is connected to a substrate (not shown) on the bracket 23 by soldering. Thereby, the stator 20 as shown in FIG. 15 is obtained.

  Referring to FIG. 4, subsequently, a suction magnet (not shown) is mounted at a predetermined position as necessary. Next, the rotor 10 is mounted on the stator 20 by inserting the shaft 13 into the bearing 30. At this time, the retaining washer portion 26a of the insulator 26 is engaged with the groove 13a. In particular, when the insulator 26 is made of a flexible material such as a resin material, the retaining washer 26a is deformed when the shaft 13 is inserted into the hole 21b, and the retaining washer 26a is inserted into the groove 13a. As a result, the retaining washer 26a returns to its shape. As a result, the rotor 10 is prevented from coming off from the stator 20. Thereafter, the alignment member 41 and the cushion rubber 42 are installed on the rotor frame 11, and the motor 100 is completed.

  In the present embodiment, a retaining washer 26 a that is a part of the insulator 26 attached to the stator core 21 is larger than the outer diameter of the bottom of the groove 13 a formed in the shaft 13 and the diameter of the outer peripheral surface of the shaft 13. It is formed smaller than (outer diameter). Since this retaining washer portion 26a constitutes a mechanism for preventing the rotor 10 from coming off, parts for preventing the shaft 13 from coming off become unnecessary, and the number of parts can be reduced. Further, since the bearing 30 is directly fixed to the stator core 21 without using the bearing housing, the inner diameter side of the insulator 26 does not interfere with the bearing housing, and the retaining washer portion 26a is easily provided at the inner diameter side end portion of the insulator 26. Insulator 26 can be made into a simple shape. As a result, the disk rotation motor can be manufactured by a simple method.

[Modification]
Then, the modification of embodiment of this invention is demonstrated. In addition, since the structure of the modified example other than the structure demonstrated below is the same as that of the above-mentioned embodiment, the same code | symbol is attached | subjected to the same member and the description is not repeated.

  FIG. 16 is a cross-sectional view schematically showing a configuration in the vicinity of the retaining washer 26a in the disk rotating motor according to the first modification of the present invention. FIG. 16 is a cross-sectional view taken along a plane including the rotation axis.

  Referring to FIG. 16, a retaining washer portion 26a of the insulator 26 includes a chamfered portion 90 formed at a boundary between a surface (upper surface in FIG. 16) facing the bearing 30 side and an inner diameter side end surface, and the bracket 23 side. It includes a square portion 91 formed at the boundary between the facing surface (the lower surface in FIG. 16) and the inner diameter side end surface. The chamfered portion 90 is a portion that is chamfered into a curved surface, and the square portion 91 is a portion that is not chamfered. The radius of curvature of the chamfered portion 90 is larger than the radius of curvature of the angular portion 91.

  According to this modification, the upper surface side in FIG. 16 of the retaining washer portion 26a has a curved surface shape, and the lower surface side in FIG. 16 has a planar shape, so that the insulator 26 can be easily inserted into the groove 13a. And the insulator 26 is difficult to come off from the groove 13a.

  FIG. 17 is a cross-sectional view schematically showing the configuration of a disk rotation motor in a second modification of the present invention.

  Referring to FIG. 17, the motor 100 of this modification is different from the motor of the above-described embodiment in that the stator core 21 further includes a plate 51. The plate 51 is laminated on the plate 52 at the upper end portion of the stator core 21 in FIG.

  18 and 19 are perspective views showing the configuration of the plate 51. FIG. 18 is a diagram when viewed from the side facing the rotor 10, and FIG. 19 is a diagram when viewed from the side facing the bracket 23.

  With reference to FIGS. 17-19, the plate 51 (inner bending core with a large through-hole) includes a laminated portion 51a and a cylindrical bent portion 51b. The stacked portion 51a has a flat plate shape and is stacked on the plate 52 along the axial direction. A plurality of teeth portions 21a and holes 21c are formed in the stacked portion 51a. The bent portion 51b is bent from the stacked portion 51a toward the plate 52 on the inner diameter side of the stacked portion 51a. The bent portion 51b extends in the axial direction and forms a hole 21b. The bearing 30 is fastened to the bent portion 51 b by press fitting, and the inner peripheral surface of the bent portion 51 b is in contact with the outer peripheral surface of the bearing 30. The outer peripheral surface of the bent portion 51 b is in contact with the inner diameter side ends of the plates 52 and 53. The bent portion 51 b extends between the inner diameter side ends of the plates 52 and 53 and the bearing 30. The hole 21c has a diameter d1.

  The bent portion 51b of the plate 51 does not need to cover the inner diameter side ends of all the plates 52 and 53, but is long enough to allow the stator core 21 fixed to the bearing 30 to exhibit a desired mounting strength. It is desirable to have a thickness.

  According to this modification, a cylindrical wall surface is provided between the bearing 30 and the stator core 21 by the bent portion 51 b obtained by bending a part of the plate 51 constituting the stator core 21. As a result, the metal oil of the bearing 30 is prevented from being absorbed by the stator core 21.

[Others]
The disk rotation motor of the present invention may be a shaft fixed type motor, a plane facing type motor, or the like in addition to the shaft rotation type motor as in the above embodiment.

  The above-described embodiments can be combined as appropriate. For example, the disk rotating motor may include the insulator 26 including the retaining washer portion 26a illustrated in FIG. 16 and the stator core 21 including the plate 51 illustrated in FIGS.

  The above-described embodiment is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Rotor 11 Rotor frame 11a Turntable part of rotor frame 11b Side wall part of rotor frame 11c Inner diameter side end part of turntable part 12 Magnet 13 Shaft 13a Shaft groove 20 Stator 21 Stator core 21a Teeth part 21b, 21c Stator core hole 22 Stator Coil 23 Bracket 23a, 23b, 23c Bracket bottom 23d Bracket burring 23e Bracket outer edge 24 Bottom plate 25 Thrust plate 26, 27 Insulator 26a Insulator retaining washer 26b Insulator bearing engaging portion 26c Insulator inner diameter 26d Insulator teeth 26e Insulator core covering 26f Insulator partition 30 Bearing 30a Bearing Concave portion 41 Alignment member 42 Cushion rubber 51, 52, 53 Plate 51a Plate stack portion 51b Plate bent portion 60 Hole in turntable portion 80 Disc 80a Hole in disc 90 Chamfered portion of retaining washer portion 91 Retaining washer portion Square part 100 Motor 200 Control part d1, d2 Diameter

Claims (5)

A rotation axis;
A bearing that rotatably supports the rotary shaft on the outer diameter side of the rotary shaft;
A stator for fixing the bearing,
The stator is
A stator core attached to the outer peripheral surface of the bearing;
A coil wound around the stator core;
An insulator that insulates the stator core and the coil from each other;
The rotating shaft includes a groove formed on an outer peripheral surface of the rotating shaft, the insulator includes an engaging portion that engages with the groove, and the engaging portion is formed at an inner diameter side end of the insulator ,
The insulator includes an insulator body formed between the stator core and the coil, and an extending portion extending along the extending direction of the rotating shaft between the insulator body and the engaging portion. In addition,
The bearing is a disk rotation motor including a recess that is recessed toward the inner diameter side at an end portion of the outer peripheral surface of the bearing and that engages with the extending portion .   The engaging portion includes a curved chamfered portion formed at a boundary between one surface of the engaging portion and an inner diameter side end surface of the engaging portion; the other surface of the engaging portion; 2. The disk rotation motor according to claim 1, further comprising: a corner portion formed at a boundary with an inner diameter side end surface of the joint portion, wherein a radius of curvature of the chamfered portion is larger than a radius of curvature of the corner portion. . A bracket for supporting one end of the rotating shaft;
The disk rotation motor according to claim 1, wherein the groove is formed at a position between the bearing and the bracket. The stator core includes first and second plates stacked along the extending direction of the rotating shaft,
The first plate is
A laminated portion laminated on the second plate along the extending direction of the rotating shaft;
Wherein a bent bent portion towards said from the laminated portion at the inner diameter side of the laminate the second plate, and a bent portion that contacts the outer peripheral surface of the bearing, claim 1-3 2. The disk rotation motor according to item 1. A disk rotating motor according to any one of claims 1-4, and a control unit for controlling the driving state of the disk rotating motor, the disk drive device.

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