JP3984451B2 - Motor and disk device - Google Patents

Motor and disk device Download PDF

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Publication number
JP3984451B2
JP3984451B2 JP2001341692A JP2001341692A JP3984451B2 JP 3984451 B2 JP3984451 B2 JP 3984451B2 JP 2001341692 A JP2001341692 A JP 2001341692A JP 2001341692 A JP2001341692 A JP 2001341692A JP 3984451 B2 JP3984451 B2 JP 3984451B2
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JP
Japan
Prior art keywords
bracket
stator
peripheral
fixed
motor
Prior art date
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Expired - Fee Related
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JP2001341692A
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Japanese (ja)
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JP2003153481A (en
Inventor
佳樹 岡山
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日本電産株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor, and more particularly, to a motor in which a bracket constituting a stationary member is formed by pressing or the like, or a thin member formed for miniaturization and thickness reduction.
[0002]
[Prior art]
A disk device in a hard disk or the like has a motor for rotation driving arranged concentrically with a recording disk to be rotated. The motor mainly includes a fixed side member such as a shaft and a base member, a rotor that is rotatably supported by the fixed side member and on which a recording disk is mounted, and a stator that is fixed to the fixed side member. Yes. The stator is provided with an armature coil, and the rotor is provided with a rotor magnet facing the stator, and the rotor is rotated by the electromagnetic action of both.
[0003]
In such a motor, a bracket is provided as a member constituting the stationary member. The bracket mainly supports the stator and is formed in a disc shape to constitute the bottom surface portion of the motor.
A conventional bracket is generally a machined product formed by cutting, but as shown in Japanese Patent Laid-Open No. 7-245903, the bracket may be formed by pressing to reduce costs. It has been broken. FIG. 1 shows the apparatus disclosed in the publication. This device is fixed to a rotor hub 1 having a rotor magnet fixed to the inner periphery thereof, a shaft 2 that rotatably supports the rotor hub 1 and having a flange portion 2a formed at the lower end, and a flange portion 2a of the shaft 2. A stator 3 and a bracket 5 for fixing the shaft 2 to the lower chassis 4 are provided. These members are attached to the upper chassis 7 by a pair of screw members 6a and 6b.
[0004]
[Problems to be solved by the invention]
The bracket formed by pressing as described above has to be thin, especially in the case of a so-called shaft fixing type motor that fixes the shaft to the center of the bracket, and the shaft and the bracket are fastened. A sufficient strength cannot be obtained in the part. Therefore, as shown in the publication, a flange portion 2a is provided at the lower end portion of the shaft 2, and the bracket 5 and the shaft 2 are fastened via the flange portion 2a. Further, since the bracket is thin, the rigidity in the axial direction and the tilt direction is lowered, which may affect the recording / reproducing accuracy of the disk due to vibration. For this reason, even if the bracket is formed by pressing, another member or the like for increasing the rigidity is required.
[0005]
Therefore, in the conventional device, even if the bracket is pressed and the processing cost is reduced, the processing cost of other parts is increased or the number of parts is increased to compensate for the lowering of the rigidity. Cannot be achieved.
In addition, the bracket is formed by cutting to reduce the size and thickness, and the thickness of the member may be reduced. Similarly, the bracket made of such a thin member also has low axial and inclined rigidity. The motor may be prone to vibration.
[0006]
An object of the present invention is to prevent vibrations from occurring even when a bracket made of a thin member is used.
[0007]
[Means for Solving the Problems]
A motor according to a first aspect includes a stationary member, a rotor, and a stator. The fixed side member is fixed to the fixed member main body and the fixed member main body. Formed by pressing a plate member It has a bracket made of a thin member. The rotor is rotatably supported by the fixed member and has a magnet on the outer periphery. The stator has a coil fixed to the bracket and facing the magnet of the rotor. The bracket extends in the direction of the rotation axis of the rotor, is fixed to be sandwiched between the fixing member main body and the radial end surface of the stator, and extends in a direction that is continuous with the cylinder and intersects the rotation axis. And a bottom surface portion that contacts the end surface of the stator in the rotation axis direction so as to suppress deformation in the rotation axis direction.
[0008]
In this motor, the rotor rotatably supported by the fixed side member is rotated by electromagnetic action between the rotor magnet and the stator. At this time, the bracket to which the stator is fixed is made of a thin member, and its own rigidity (the rigidity in the rotation axis direction and the inclination direction) is relatively low. Therefore, there is a possibility that the fastening strength with the other fixed side member is insufficient.
[0009]
However, according to the present invention, the cylindrical portion is formed in the bracket, and the cylindrical portion is sandwiched between the fixing member main body and the radial end surface of the stator, so that the fastening strength of the bracket with the fixing member main body is increased. Can be high. Moreover, since the bottom surface portion of the bracket is in contact with the axial end surface of the stator and the cylindrical portion is in contact with the radial end surface of the stator, deformation in the rotation axis direction and the inclination direction is suppressed, so that the rotation shaft The rigidity in the direction and the tilt direction can be improved.
[0010]
Thus, in the present invention, even if the bracket is formed of a thin member, the fastening strength and rigidity of the bracket with respect to the fixing member main body can be improved by devising the structure of the bracket itself and the arrangement with the stator. Therefore, when the thin member is pressed to form the bracket, the processing cost can be reduced, the rigidity can be improved without using a separate member, and the manufacturing cost as a whole can be suppressed. Further, by forming the bracket with a thin member, the motor can be reduced in size and thickness.
[0011]
According to a second aspect of the present invention, in the motor of the first aspect, the bottom surface of the bracket is different from the stator receiving portion in contact with the axial end surface of the stator and the stator receiving portion so as to be separated from the end surface of the stator in the rotational axis direction. And a disk portion formed on the surface.
Here, the bottom surface of the bracket is composed of a stator receiving portion and a disc portion having different heights, the stator receiving portion abuts on the axial end surface of the stator, and the disc portion is formed between the axial end surface of the stator. The formed space serves as a relief for the coil protruding from the axial end surface of the stator.
[0012]
In this case, as compared with the case where the bottom surface of the bracket is flush with the entire surface, the rigidity becomes higher and contact between the armature coil of the stator and the bottom surface of the bracket can be avoided without changing the shape of the stator. it can.
According to a third aspect of the present invention, in the motor according to the first aspect, the stator includes a contact portion that is in contact with the bottom surface portion of the bracket and a contact portion that is formed so as to be separated from the bottom surface portion of the bracket. And a contact portion. The bottom surface of the bracket is formed so that the contact portion with the stator and the non-contact portion are flush with each other.
[0013]
In this case, since the bottom surface of the bracket is flush, the shape of the bracket is simpler and easier to process and the length of the cylindrical portion is longer than when the bottom surface is provided with a step. (See FIGS. 2 and 4), and the fastening strength between the bracket and the fixing member main body can be further increased.
A motor according to a fourth aspect is the motor according to the first aspect, wherein the magnet of the rotor is disposed on the outer peripheral side of the stator.
[0014]
A motor according to a fifth aspect is the motor according to the fourth aspect, wherein the fixing member body is a shaft fixed to the central portion of the bracket, and the cylindrical portion of the bracket is formed on the inner peripheral portion of the bracket and is formed on the inner peripheral surface. The shaft is fixed, and the inner peripheral end surface of the stator is fixed to the outer peripheral surface.
The motor according to a sixth aspect is the motor according to the first aspect, wherein the magnet of the rotor is disposed on the inner peripheral side of the stator.
[0015]
The motor according to a seventh aspect is the motor according to the sixth aspect, wherein the fixing member body is a base member to which the outer peripheral portion of the bracket is fixed, and the cylindrical portion of the bracket is formed on the outer peripheral portion of the bracket, The member is fixed, and the outer peripheral end surface of the stator is fixed to the inner peripheral surface. Here, the base member is a member (for example, a chassis) that constitutes a part of a device on which the motor is mounted.
[0016]
The motor according to an eighth aspect is the motor according to any one of the first to seventh aspects, wherein the stator is a portion of 20% or more of the inner / outer diameter difference L (R1-R2) when the outer diameter is R1 and the inner diameter is R2. The end surface in the axial direction is in contact with the bottom surface of the bracket.
Here, a substantial portion of the end surface in the axial direction of the stator is in contact with the bottom surface portion of the bracket, thereby achieving sufficient rigidity of the bracket.
[0017]
A disk device according to a ninth aspect includes the motor according to any one of the first to eighth aspects, and a recording disk mounted on the rotor.
In this disk device, since the bracket can be manufactured with a thin member without lowering the rigidity, the cost can be reduced and the size and thickness can be reduced.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
(1) Structure
FIG. 2 is a schematic cross-sectional configuration diagram of the motor 10 in which the first embodiment of the present invention is employed. The motor 10 is a motor that is mounted on a disk device and rotationally drives a recording disk or the like. The O-O line in FIG.
[0019]
In FIG. 2, the motor 10 mainly includes a fixed side member 12 fixed to an opening formed in the chassis 11 of the disk device, a rotor 13 rotatable relative to the fixed side member 12, and a fixed side member 12. And a stator 14 fixed to the head.
The stationary member 12 has a shaft 15 and a bracket 16 to which the shaft 15 is fixed at the center.
[0020]
The bracket 16 is a thin disk-shaped member formed by pressing a plate member, and in order from the inner peripheral portion, the inner peripheral cylindrical portion 20, the stator receiving portion 21, the circular plate portion 22, and the outer peripheral cylindrical portion 23. And the flange portion 24 is continuously provided.
The inner peripheral cylindrical portion 20 is formed to extend in the rotation axis direction, and a shaft 15 is fixed to the inner peripheral surface thereof. The stator receiving portion 21 and the disc portion 22 constitute a bottom surface portion of the bracket 16, extend from the lower end portion of the inner peripheral cylindrical portion 20 in a direction perpendicular to the rotation axis, and are formed in steps. The stator receiving portion 21 is in contact with an end surface (hereinafter referred to as a bottom surface) 14 a in the rotation axis direction of the stator 14, and the disc portion 22 is provided apart from the bottom surface of the stator 14. The outer peripheral cylindrical portion 23 is formed in parallel with the inner peripheral cylindrical portion 20, and a flange portion 24 is formed further outward from the upper end portion of the outer peripheral cylindrical portion 23. Then, the outer peripheral surface of the outer peripheral cylindrical portion 23 abuts against the end surface of the opening of the chassis 11 to perform centering (radial positioning), and the lower surface of the outer peripheral portion of the flange portion 24 is fixed to the chassis 11 with screws. .
[0021]
The rotor 13 has a rotor hub 30 that is rotatably supported on the shaft 15 by two bearings 25 and 26 and on which a disk is mounted. The inner peripheral surface of a cylindrical yoke 31 provided on the outer peripheral portion of the rotor hub 30. A rotor magnet 32 is provided. A recording disk is placed on the upper surface of the rotor hub 30.
[0022]
The stator 14 includes a stator core 33 formed by laminating magnetic plates and an armature coil 34 wound around the stator core 33. The stator core 33 is composed of an annular portion and a plurality of magnetic pole portions extending radially outward from the outer peripheral side of the stator core and spaced apart in the circumferential direction, and a coil 34 is wound around each of the magnetic pole portions. Such a stator 14 is disposed inward of the rotor 13, and an end face on the outer peripheral side faces the rotor magnet 32 via a predetermined gap. The stator 14 and the rotor magnet 32 constitute a magnetic circuit unit for applying a rotational force to the rotor 13.
[0023]
Further, the end surface on the inner peripheral side of the stator 14 (more precisely, the inner peripheral surface of the annular portion of the stator core 33) is fixed to the outer peripheral surface of the inner peripheral cylindrical portion 20 of the bracket 16. That is, the inner peripheral cylindrical portion 20 of the bracket 16 is fixed to the shaft 15 so as to be sandwiched between the shaft 15 and the inner peripheral end surface of the stator 14. Further, as described above, a part of the bottom surface of the stator 14 is received by the stator receiving portion 21 of the bracket 16, and details of this portion are shown in FIG. As shown in this figure, when the outer diameter of the stator 14 is R1, the inner diameter is R2, and the inner / outer diameter difference (R2-R1) is L, the bottom surface of the stator 14 is received by the stator receiving portion 21. It is desirable to set the dimensions so that the length C in the radial direction is 20% or more of L. In this embodiment, C is about 40% of L.
[0024]
Above the shaft 15, a seal cap 35 is provided on the upper end surface of the rotor hub 30 in order to prevent lubricant such as grease for lubricating the bearings 25 and 26 from scattering into the disk chamber. Yes.
(2) Operation
When the coil 34 of the stator 14 is energized, a magnetic circuit is formed between the stator 14 and the rotor 13, whereby the rotor 13 rotates around the shaft 15.
[0025]
In such a rotational operation, if the axial rigidity of the bracket 16 is insufficient, the bracket 16 cannot stably support the shaft 15 due to the rotational force of the rotor 13, and the entire motor vibrates to record the disk. Or it will adversely affect regeneration.
However, in the present embodiment, the stator receiving portion 21 on the bottom surface of the bracket 16 is in contact with a portion that occupies about 40% of the difference between the inner and outer diameters of the stator 14 in the radial direction. The rigidity of the bottom part is reinforced. For this reason, compared with the case where the stator 14 and the bracket 16 are not contact | abutting, the rigidity of the bracket 16 becomes high and the bad influence to the apparatus by a vibration can be suppressed. Further, at the fastening portion between the bracket 16 and the shaft 15, the inner peripheral cylindrical portion 20 formed on the bracket 16 is fastened to the shaft 15 so as to be sandwiched between the shaft 15 and the inner peripheral end surface of the stator 14. Therefore, the fastening strength between them is high.
[0026]
Further, the disk portion 22 on the bottom surface portion of the bracket 16 is formed at a position lower than the position of the stator receiving portion 21, and a coil 34 protruding from the bottom surface 14 a of the stator 14 is formed in an annular recess formed by this stepped portion. Thus, the stator 14 can fix the stator core 33 in a flat shape. In addition, by forming this stepped portion, the rigidity becomes higher than when the bottom surface portion is flush.
[0027]
[Second Embodiment]
FIG. 4 shows a second embodiment of the present invention. In this embodiment, the configurations of the bracket 40 and the stator 50 are different, and the other configurations are the same as those of the first embodiment.
In FIG. 4, the bracket 40 constituting the fixed side member is a thin disk-shaped member formed by pressing a plate member as described above, and the inner circumferential cylindrical portion 41, in order from the inner circumferential portion, The bottom portion 42, the outer cylindrical portion 43, and the flange portion 44 are continuously provided.
[0028]
The inner peripheral cylindrical portion 41 is formed extending in the rotation axis direction, and the shaft 15 is fixed to the inner peripheral surface thereof. Further, the bottom surface portion 42 is formed to extend from the lower end portion of the inner peripheral cylindrical portion 41 in a direction orthogonal to the rotation axis. The bottom surface 50a of the stator 50 is in contact with a part on the inner peripheral side of the bottom surface portion 42, that is, a portion within a predetermined range from the inner peripheral cylindrical portion 41 outward. The outer peripheral cylindrical portion 43 is formed in parallel with the inner peripheral cylindrical portion 41, and a flange portion 44 is further formed outward from the upper end portion of the outer peripheral cylindrical portion 43. And the outer peripheral surface of the outer periphery cylindrical part 43 contact | abuts to the opening part end surface of the chassis 11, and the outer peripheral part lower surface of the flange part 44 is being fixed to the chassis 11 with the screw | thread.
[0029]
The stator 50 includes a stator core 51 and an armature coil 52, and is disposed on the inner side of the rotor so that the end face on the outer peripheral side faces the rotor magnet 32 via a predetermined gap. The stator core 51 has a step difference between an inner peripheral portion (inner peripheral side of the annular portion) and an outer peripheral portion (magnetic pole portion). In FIG. 4, the outer peripheral side of the annular portion and the inner peripheral side of the magnetic pole portion are separated. The height of the magnetic pole portion is increased in an inclined manner toward the outside in the radial direction. As described above, a part on the inner peripheral side (the inner peripheral surface of the annular part) abuts on a part of the bottom part 42 of the bracket 40, and the outer peripheral part is separated from the bottom part 42 of the bracket 40. This prevents the coil 52 protruding from the bottom surface 50 a of the stator 50 from interfering with the bottom surface portion 42.
[0030]
Further, as in the first embodiment, the end surface on the inner peripheral side of the stator 50 is fixed to the outer peripheral surface of the inner peripheral cylindrical portion 41 of the bracket 40, and the inner peripheral cylindrical portion 41 of the bracket 40 is connected to the shaft 15 and the stator 50. It is being fixed to the shaft 15 so that it may be pinched | interposed with an internal peripheral end surface.
In this case as well, when the outer diameter of the stator 50 is R1, the inner diameter is R2, and the inner / outer diameter difference (R2-R1) is L, the bottom surface of the stator 50 is in contact with the bottom surface portion 42 of the bracket 40. It is desirable to set the dimensions so that the radial length C is 20% or more of L. In this second embodiment, it is about 30%.
[0031]
In the second embodiment, since the bottom surface portion 42 of the bracket 40 is in contact with the bottom surface of the stator 50 as in the above-described embodiment, the rigidity of the bracket 40 is reinforced. For this reason, the bad influence to the apparatus by vibration can be suppressed. The fastening strength between the bracket 40 and the shaft 15 is also high. In particular, in this embodiment, since the bottom surface of the bracket 40 is formed flush, the inner peripheral cylindrical portion 41 can be lengthened without increasing the overall height of the device as compared with the first embodiment. The fastening strength is further improved. Moreover, since the shape of the bracket 40 is simple, it is easy to process.
[0032]
[Third Embodiment]
FIG. 5 shows a third embodiment of the present invention. This embodiment differs from the previous embodiment in the configuration of the bracket and the stator, and the other configurations are the same.
In FIG. 5, the bracket 60 constituting the fixed side member is basically the same as that of the second embodiment, and the inner peripheral cylindrical portion 61, the bottom surface portion 62, the outer peripheral cylindrical portion 63, and the flange are sequentially arranged from the inner peripheral portion. It has the part 64 continuously. In addition, the stator 65 includes a flat stator core 66 and an armature coil 67 that are not formed with a stepped portion similar to the first embodiment. A plurality of openings 62 a for avoiding interference with the coil 67 are provided in the bottom surface portion 62 of the bracket 60 at equal angular intervals in the circumferential direction corresponding to the arrangement of the coils 67. This part is in contact with the bottom surface of the stator 65.
[0033]
Here, in addition to the same effects as those of the first embodiment, the length of the inner peripheral cylindrical portion 61 of the bracket 60 can be secured longer, and the coil 67 and the bracket 60 can be connected without bending the core 66 of the stator 65. Interference can be avoided.
[Fourth Embodiment]
FIG. 6 shows a fourth embodiment of the present invention. The motor 70 in this embodiment includes a fixed side member 71 fixed to the chassis 11, a rotor 72 rotatable with respect to the fixed side member 71, and a stator 73 fixed to the fixed side member 71.
[0034]
The fixed side member 71 includes a bracket 74 fixed to an opening formed in the chassis 11 and outer rings 75a and 76a of two bearings 75 and 76 for rotatably supporting the rotor 72 with respect to the bracket 74. Have.
As described above, the bracket 74 is a thin disk-shaped member formed by pressing a plate member, and in order from the inner peripheral portion, the inner peripheral cylindrical portion 81, the bottom surface portion 82, the outer peripheral cylindrical portion 83, and the flange. The portion 84 is continuously provided. The inner peripheral cylindrical portion 81 is formed to extend in the rotation axis direction, and bearing outer rings 75a and 76a are fixed to the inner peripheral surface thereof. Further, the bottom surface portion 82 is formed to extend from the lower end portion of the inner peripheral cylindrical portion 81 in a direction orthogonal to the rotation axis, and a part on the inner peripheral side of the bottom surface portion 82, that is, outward from the inner peripheral cylindrical portion 81. The bottom surface of the stator 73 is in contact with a portion within a predetermined range. The outer peripheral cylindrical portion 83 is formed in parallel with the inner peripheral cylindrical portion 81, and a flange portion 84 is further formed outward from the upper end portion of the outer peripheral cylindrical portion 83. The outer peripheral surface of the outer peripheral cylindrical portion 83 abuts on the end surface of the opening of the chassis 11, and the lower surface of the outer peripheral portion of the flange portion 84 is fixed to the chassis 11.
[0035]
The rotor 72 is rotatably supported on the inner peripheral cylindrical portion 81 of the bracket 74 by the above-described two bearings 75 and 76, and a circle provided on the upper end portion of the rotor shaft portion 85. It has a plate-like rotor hub 86, a cylindrical yoke 87 provided on the outer peripheral portion of the rotor hub 86, and a rotor magnet 88 provided on the inner peripheral surface of the yoke 87.
[0036]
The stator 73 includes a stator core 90 and an armature coil 91, and is disposed inwardly of the rotor 72 so that the outer peripheral end face faces the rotor magnet 88 with a predetermined gap. As in the second embodiment, the stator core 90 is stepped between the inner peripheral portion and the outer peripheral portion, and the height of the outer peripheral portion is higher. The bottom surface of the inner peripheral side part abuts on a part of the bottom surface part 82 of the bracket 74, and the outer peripheral side part is separated from the bottom surface part 82 of the bracket 74. As a result, the coil 91 is prevented from interfering with the bottom surface portion 82.
[0037]
The end surface on the inner peripheral side of the stator 73 is fixed to the outer peripheral surface of the inner peripheral cylindrical portion 81 of the bracket 74, and the inner peripheral cylindrical portion 81 of the bracket 74 is defined by the bearing outer rings 75 a and 76 a and the inner peripheral end surface of the stator 73. It is fixed to bearing outer rings 75a and 76a as fixed side members so as to be sandwiched.
Also in this embodiment, when the outer diameter of the stator 73 is R1, the inner diameter is R2, and the inner / outer diameter difference (R2-R1) is L, the bottom surface of the stator 73 is in contact with the bottom surface portion 82 of the bracket 74. It is desirable to set the dimensions so that the radial length C of the portion is 20% or more of L. In the fourth embodiment, it is about 40%.
[0038]
Even in such an embodiment, the same effects as those of the above-described embodiments can be obtained, and in particular, since the length of the inner peripheral cylindrical portion 81 of the bracket 74 can be ensured longer, the fastening strength of the bracket with respect to the bearing becomes higher.
[Fifth Embodiment]
FIG. 7 shows a fifth embodiment of the present invention. The motor 100 in this embodiment includes a fixed side member 101 fixed to the chassis 11, a rotor 102 that is rotatable with respect to the fixed side member 101, and a stator 103 fixed to the fixed side member 102.
[0039]
The fixed-side member 101 includes a shaft 104 and a bracket 105 in which the shaft 104 is fixed to the center portion and the outer peripheral portion is fixed to the chassis 11.
As described above, the bracket 105 is a thin disk-shaped member formed by pressing a plate member. The bracket 105 has a hole in which the shaft 104 is fixed at the center and extends in a direction perpendicular to the axial direction. A plate-shaped bottom surface portion 106, a cylindrical portion 107 extending axially upward from the outer periphery of the bottom surface portion 106, and a flange portion 108 extending from the upper end portion of the cylindrical portion 107 to the outer peripheral side are continuously provided. The outer peripheral surface of the cylindrical portion 107 is in contact with the opening end face of the chassis 11, and the flange portion 108 is fixed to the upper surface of the chassis 11. Further, a bottom surface of the stator 103 described later is in contact with a part of the outer peripheral side of the bottom surface portion 106, that is, a predetermined region inward from the cylindrical portion 107.
[0040]
The rotor 102 includes a rotor hub 112 that is rotatably supported on the shaft 104 by two bearings 110 and 111 and on which a disk is mounted, and a rotor magnet 113 that is provided in a substantially lower half region of the outer peripheral surface of the rotor hub 112. ing. The stator 103 includes a stator core 115 and an armature coil 116. The stator core 115 is composed of an annular portion and a plurality of magnetic pole portions extending radially inward from the inner peripheral side of the stator core and spaced apart in the circumferential direction, and coils 116 are wound around the magnetic pole portions. Such a stator 103 is disposed on the outer side of the rotor 112, and the end surface on the inner peripheral side faces the rotor magnet 113 with a predetermined gap therebetween. The stator core 115 has a step difference between an inner peripheral side portion (magnetic pole portion) and an outer peripheral side portion (outer peripheral side of the annular portion), and the inner peripheral side portion where the coil 116 is provided is higher. Then, the bottom surface of the outer peripheral side part abuts on a part of the bottom surface part 106 of the bracket 105, and the inner peripheral side part is separated from the bottom surface part 106 of the bracket 105.
[0041]
An end face on the outer peripheral side of the stator 103 (more precisely, an outer peripheral face of the annular part of the stator core 115) is fixed to an inner peripheral face of the cylindrical part 107 of the bracket 105, and the cylindrical part 107 of the bracket 105 is an open end face of the chassis 11. And the outer peripheral end surface of the stator 103.
Also in this embodiment, when the outer diameter of the stator 103 is R1, the inner diameter is R2, and the inner / outer diameter difference (R2-R1) is L, the bottom surface of the stator 103 is in contact with the bottom surface portion 106 of the bracket 105. It is desirable to set the dimensions so that the radial length C of the portion is 20% or more of L. In this embodiment, it is about 40%.
[0042]
In such an embodiment, the same effects as those of the above-described embodiments can be obtained.
[Sixth Embodiment]
FIG. 8 shows a sixth embodiment of the present invention. The motor 120 in this embodiment includes a bracket 121 fixed to the chassis 11, a rotor 122 rotatable with respect to the bracket 121, and a stator 123 fixed to the bracket 121.
[0043]
As described above, the bracket 121 is a thin disk-shaped member formed by pressing a plate member, and an inner peripheral cylindrical portion 125 and an inner peripheral cylindrical portion 125 extending in the axial direction in order from the inner peripheral side. A disc-shaped bottom surface portion 126 extending in a direction orthogonal to the axial direction from a lower end portion of the bottom surface portion, an outer peripheral cylindrical portion 127 extending in parallel to the inner peripheral cylindrical portion 125 in the axial direction from the outer peripheral end portion of the bottom surface portion 126, and an outer peripheral cylindrical portion A flange portion 128 extending from the upper end portion of 127 to the outer peripheral side is continuously provided. The outer peripheral surface of the outer peripheral cylindrical portion 127 abuts on the opening end surface of the chassis 11, and the flange portion 128 is fixed to the upper surface of the chassis 11. Further, the bottom surface of the stator 123 is in contact with a part of the outer peripheral side of the bottom surface portion 126, that is, a predetermined region inward from the outer peripheral cylindrical portion 127.
[0044]
The rotor 122 includes a rotor shaft 132 that is rotatably supported by the inner peripheral cylindrical portion 125 of the bracket 121 by two bearings 130 and 131, a rotor hub 133 that is mounted on the upper end portion of the rotor shaft 132 and on which a disk is mounted, and a rotor hub. And a rotor magnet 134 attached to 133. The rotor hub 133 includes a disc portion extending in a direction orthogonal to the axial direction and a cylindrical yoke provided at the outer end of the disc portion, and the rotor magnet 134 is fixed to the outer peripheral surface of the lower portion of the yoke. . The disc is fixed to the rotor hub 133.
[0045]
The stator 123 has the same configuration as that of the stator 103 shown in FIG. 7, and the same effect can be obtained.
[Other Embodiments]
As mentioned above, although the embodiment of the disk drive motor of the present invention has been described, the present invention is not limited to the above embodiment, and can be changed without departing from the gist of the present invention. For example, each of the brackets is a thin member having low rigidity due to being formed by pressing, but is not limited to this, and is formed by cutting to reduce the size and thickness. In addition, the present invention can be applied even when the thickness is reduced to the same level of rigidity. In addition, the bracket in each of the above-described embodiments is fixed to the chassis of the disk device, but is applicable even if the bracket and the chassis are integrally formed. Further, the above motors are all for driving a recording disk, but the present invention is not limited to this, and can be applied to other uses (such as a fan motor for cooling personal computers).
[0046]
[Disk device to which motor of each embodiment is applied]
FIG. 9 shows a schematic diagram of an internal configuration of a general disk device 150. The interior of the housing 151 forms a clean space with extremely small amounts of dust and the like, and a motor 153 on which a disc-shaped disk plate 152 for storing information is mounted is installed. In addition, a head moving mechanism 154 for reading / writing information from / to the disk plate 152 is disposed inside the housing. The head moving mechanism includes a head 155 for reading / writing information on the disk plate, an arm 156 for supporting the head, and The actuator unit 157 moves the head and arm to a required position on the disk plate.
[0047]
【The invention's effect】
As described above, according to the motor of the present invention, the cylindrical portion is formed in the bracket, and this cylindrical portion is sandwiched between the fixing member main body and the radial end surface of the stator. While increasing the fastening strength , Ma Since the bottom of the bracket and the bottom of the stator are in contact, Formed by pressing a plate member Even if a bracket made of a thin member is used, the rigidity in the rotation axis direction and the tilt direction can be increased without using a separate member, and vibrations and the like can be prevented. For this reason, a bracket can be formed by press work and the manufacturing cost of a motor can be held down. In addition, the thickness of the bracket can be reduced to reduce the size and thickness of the motor.
[0048]
Furthermore, according to the disk device of the present invention, in addition to being able to rotate the disk stably, it is possible to reduce the cost or reduce the size and thickness.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a conventional motor.
FIG. 2 is a schematic cross-sectional configuration diagram of a motor according to the first embodiment of the present invention.
FIG. 3 is a partial view of FIG.
FIG. 4 is a schematic sectional view of a motor according to a second embodiment of the present invention.
FIG. 5 is a schematic cross-sectional configuration diagram of a motor according to a third embodiment of the present invention.
FIG. 6 is a schematic sectional view of a motor according to a fourth embodiment of the present invention.
FIG. 7 is a schematic cross-sectional configuration diagram of a motor according to a fifth embodiment of the present invention.
FIG. 8 is a schematic cross-sectional configuration diagram of a motor according to a sixth embodiment of the present invention.
FIG. 9 is a schematic diagram showing an embodiment of a disk device of the present invention.
[Explanation of symbols]
10, 70, 100, 120 Motor
11 Chassis
12, 71, 101 Fixed side member
13, 72, 102, 122 rotor
14, 50, 65, 73, 103, 123 Stator
15 shaft
16, 40, 60, 74, 105, 121 Bracket
20, 41, 61, 81 Inner cylindrical part
21 Stator receptacle
22 disc part
42, 62, 82, 106, 126 Bottom
107,127 outer cylindrical part
150 disk unit

Claims (9)

  1. A stationary member having a stationary member main body and a bracket made of a thin member formed by pressing a plate member fixed to the stationary member main body;
    A rotor that is rotatably supported by the stationary member and has a rotor magnet on the outer periphery;
    A stator having a coil fixed to the bracket and facing the rotor magnet;
    The bracket extends in the direction of the rotation axis of the rotor, is formed so as to be sandwiched between the fixing member main body and the radial end surface of the stator, and the bracket is continuous with the cylinder and intersects the rotation axis. A bottom surface portion that is formed extending in a direction to be in contact with an end surface of the stator in the rotation axis direction so that deformation in the rotation axis direction is suppressed.
    motor.
  2. The bottom surface portion of the bracket includes a stator receiving portion that contacts the axial end surface of the stator, and a disk portion that is formed in a step difference from the stator receiving portion so as to be separated from the end surface of the stator in the rotational axis direction. The motor according to claim 1.
  3. The stator includes a contact portion that contacts the bottom surface portion of the bracket, and a non-contact portion that is formed stepwise with the contact portion so as to be separated from the bottom surface portion of the bracket,
    The bottom portion of the bracket is formed such that the contact portion and the non-contact portion with the stator are flush with each other.
    The motor according to claim 1.
  4. The motor according to claim 1, wherein the rotor magnet is disposed on an outer peripheral side of the stator.
  5. The fixing member body is a shaft fixed to a central portion of the bracket;
    The cylindrical portion of the bracket is formed on the inner peripheral portion of the bracket, the shaft is fixed to the inner peripheral surface, and the inner peripheral end surface of the stator is fixed to the outer peripheral surface.
    The motor according to claim 4.
  6. The motor according to claim 1, wherein the rotor magnet is disposed on an inner peripheral side of the stator.
  7. The fixing member main body is a base member to which an outer peripheral portion of the bracket is fixed, and a cylindrical portion of the bracket is formed on an outer peripheral portion of the bracket, the base member is fixed to an outer peripheral surface, and the The motor according to claim 6, wherein an outer peripheral end face of the stator is fixed.
  8. 2. The stator has an axial end face that is 20% or more of an inner / outer diameter difference L (R 1 −R 2) when the outer diameter is R 1 and the inner diameter is R 2. The motor according to any one of 7 to 7.
  9. A motor according to any one of claims 1 to 8,
    A recording disk mounted on the rotor;
    A disk device with
JP2001341692A 2001-11-07 2001-11-07 Motor and disk device Expired - Fee Related JP3984451B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001341692A JP3984451B2 (en) 2001-11-07 2001-11-07 Motor and disk device

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Application Number Priority Date Filing Date Title
JP2001341692A JP3984451B2 (en) 2001-11-07 2001-11-07 Motor and disk device

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JP2003153481A JP2003153481A (en) 2003-05-23
JP3984451B2 true JP3984451B2 (en) 2007-10-03

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Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013066357A (en) * 2011-08-31 2013-04-11 Nippon Densan Corp Motor and disk drive device
JP2013066356A (en) * 2011-08-31 2013-04-11 Nippon Densan Corp Motor and disk drive device
CN203118465U (en) 2012-03-01 2013-08-07 日本电产株式会社 Spindle motor and disk driving device
US8693138B2 (en) 2012-05-10 2014-04-08 Nidec Corporation Base unit
JP2014002821A (en) 2012-06-19 2014-01-09 Nippon Densan Corp Base plate, base unit, motor and disk drive
JP2014003830A (en) 2012-06-19 2014-01-09 Nippon Densan Corp Base plate, base unit, motor, disk driving device, and manufacturing method of base plate
US8699180B2 (en) 2012-06-22 2014-04-15 Nidec Corporation Motor and disk drive apparatus
US8755145B2 (en) 2012-07-06 2014-06-17 Nidec Corporation Base unit, motor and disk drive apparatus
US9148036B2 (en) 2012-07-27 2015-09-29 Nidec Corporation Base member of a motor which includes specific surface structure
US8711515B2 (en) 2012-08-31 2014-04-29 Nidec Corporation Stopper, motor, and disk drive apparatus
JP2014096884A (en) 2012-11-08 2014-05-22 Nippon Densan Corp Spindle motor and disk drive device
JP2014096883A (en) 2012-11-08 2014-05-22 Nippon Densan Corp Spindle motor and disk Drive device
US8587896B1 (en) 2013-01-03 2013-11-19 Nidec Corporation Motor and disk drive apparatus
US8665557B1 (en) 2013-03-13 2014-03-04 Nidec Corporation Spindle motor and disk drive apparatus
US8576512B1 (en) 2013-03-13 2013-11-05 Nidec Corporation Spindle motor and disk drive apparatus
JP2014216040A (en) 2013-04-28 2014-11-17 日本電産株式会社 Spindle motor and disk drive device

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