KR20140021414A - Spindle motor and hard disc drive including the same - Google Patents

Spindle motor and hard disc drive including the same Download PDF

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Publication number
KR20140021414A
KR20140021414A KR1020120087940A KR20120087940A KR20140021414A KR 20140021414 A KR20140021414 A KR 20140021414A KR 1020120087940 A KR1020120087940 A KR 1020120087940A KR 20120087940 A KR20120087940 A KR 20120087940A KR 20140021414 A KR20140021414 A KR 20140021414A
Authority
KR
South Korea
Prior art keywords
magnet
core
spindle motor
hub
axial direction
Prior art date
Application number
KR1020120087940A
Other languages
Korean (ko)
Inventor
황우순
Original Assignee
삼성전기주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020120087940A priority Critical patent/KR20140021414A/en
Publication of KR20140021414A publication Critical patent/KR20140021414A/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • G11B19/2045—Hubs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/56—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks

Abstract

The present invention relates to a spindle motor and a hard disk drive which comprises: a base member; a sleeve mounted to the base member; a shaft mounted to the sleeve to be able to rotate; a hub which is mounted to the top of the shaft to rotate with the shaft, and contains a magnet; and a core mounted to the base member to oppose the magnet, and in which a coil is winded on the outer peripheral surface. The opposing surface of the magnet and the core can be mutually inclined to widen the gap as it goes to the downward axial direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a spindle motor and a hard disk drive including the spindle motor.

The present invention relates to a spindle motor and a hard disk drive including the spindle motor.

A hard disk drive (HDD), which is one of information storage devices, is a device that reproduces data stored on a disk using a read / write head or records data on a disk.

Such a hard disk drive requires a disk drive capable of driving a disk, and a small spindle motor is used for the disk drive.

This compact spindle motor generates a rotational force for rotating the rotating member relative to the fixing member by the interaction between the magnet mounted on the rotating member and the electromagnet assembly (core wound around the outer circumferential surface) mounted on the fixing member.

Here, the disk is mounted on the rotating member (for example, the hub) and fixed by a clamp, and the rotating member (for example, the hub) is deflected axially downward by the pressing force of the clamp, so that the magnet and the core There was a problem that the rotational force may be lowered because the parallelism of the opposing surfaces is shifted.

The present invention has been proposed to solve the above problems, and to provide a spindle motor capable of maximizing the rotational force by preventing the parallelism of the opposite surface of the magnet and the core, even by mounting the clamp.

Spindle motor according to an embodiment of the present invention is a base member; A sleeve mounted to the base member; A shaft rotatably mounted to the sleeve; A hub mounted to an upper end of the shaft and rotating together with the shaft and provided with a magnet; And a core mounted on the base member, the core being wound around an outer circumferential surface thereof, and mounted to face the magnet, wherein the magnet and the opposing surface of the core may be inclined with each other so that an interval becomes wider toward an axial lower side.

In the spindle motor according to an embodiment of the present invention, the hub may be inclined downward in an axial direction when a clamp is mounted on the hub to fix the disk.

In the spindle motor according to an embodiment of the present invention, after the hub is inclined downward in the axial direction, opposite surfaces of the magnet and the core may be parallel to each other.

In the spindle motor according to an embodiment of the present invention, the core may be mounted perpendicular to the axial direction in the radial direction.

In the spindle motor according to an embodiment of the present invention, the magnet may be mounted parallel to the axial direction.

In the spindle motor according to the exemplary embodiment of the present invention, a surface facing the magnet may be cut.

In the spindle motor according to an embodiment of the present invention, the surface facing the magnet may be bent downward in the axial direction.

A spindle motor according to an embodiment of the present invention includes a fixed member; A rotating member mounted to rotate relative to the fixing member; A magnet mounted to the rotating member; And a core mounted on the fixing member, the core being wound around an outer circumferential surface thereof, and mounted to face the magnet. The opposing surfaces of the magnet and the core may be inclined with each other so that an interval becomes wider toward an axial lower side.

According to an aspect of the present invention, there is provided a hard disk drive including: a spindle motor that rotates a disk by a power supplied through a substrate; A magnetic head for recording and reproducing data of the disk; And a head transfer part for moving the magnetic head to a predetermined position on the disc.

According to the present invention, even when the clamp is mounted, it is possible to provide a spindle motor capable of maximizing the rotational force by preventing the parallelism between the opposing surfaces of the magnet and the core from shifting.

1 is a schematic cross-sectional view illustrating a spindle motor according to an embodiment of the present invention,
2 is a view comparing the deflection state of the hub before (a) and after (b) the clamp is mounted on the spindle motor according to an embodiment of the present invention,
3 and 4 are cross-sectional views showing a state in which the clan is mounted on the spindle motor according to an embodiment of the present invention,
5 is a schematic cross-sectional view of a disk drive using a spindle motor according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments which fall within the scope of the inventive concept may be easily suggested, but are also included within the scope of the present invention.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a schematic cross-sectional view showing a spindle motor according to an embodiment of the present invention, Figure 2 is a (b) and (b) of the hub before the clamp is mounted on the spindle motor according to an embodiment of the present invention 3 and 4 are cross-sectional views illustrating a state in which a clamp is mounted on a spindle motor according to an embodiment of the present invention.

1 to 4, a spindle motor 100 according to an embodiment of the present invention includes a fluid dynamic bearing assembly 110 and a hub including a shaft 111, a rotor 120, and a sleeve 112. It may include a stator 130 including a rotor 120 including the 121, a base member 133, and a core 131 on which the coil 132 is wound.

First, when defining terms for the direction, the axial direction refers to the up and down direction with respect to the shaft 111, as shown in Figure 1, the radially outer and inner direction is the hub relative to the shaft 111 A center direction of the shaft 111 may mean the outer end direction of the 121 or the outer end of the hub 121. Also, the circumferential direction may mean a direction of rotation about the rotation axis at a position spaced a predetermined distance in the radial direction about the rotation axis.

In the following description, the rotating member is a rotating member including a shaft 111, a rotor 120 including a hub 121, a magnet 127 mounted thereon, and the like. Such as the sleeve 112, the stator 130, and the base member 133, which are relatively fixed to the rotating member.

The hydrodynamic bearing assembly 110 may include a shaft 111, a sleeve 112, a stopper 111a, and a hub 121, and the hub 121 may be a component constituting the rotor 120 to be described later. At the same time, the fluid dynamic bearing assembly 110 may be configured to constitute.

The sleeve 112 may rotatably support the shaft 111. The sleeve 112 may be formed by forging Cu or Al, or sintering a Cu-Fe alloy powder or an SUS powder. However, the present invention is not limited thereto and may be manufactured in various ways.

Here, the shaft 111 is inserted into the shaft 112 of the sleeve 112 so as to have a minute clearance to form a bearing gap C. The bearing gap C is not limited to the one formed between the shaft 111 and the sleeve 112 and includes a bearing gap formed between the sleeve 112 and the hub 121. The gap of the bearing gap formed between the sleeve 112 and the hub 121 may also be formed to be equal to the gap of the bearing gap formed between the shaft 111 and the sleeve 112.

Upper and lower radial dynamic pressure grooves 114 and 115 may be formed on at least one of the outer diameter of the shaft 111 and the inner diameter of the sleeve 112. The upper and lower radial dynamic pressure grooves 114 and 115 generate fluid dynamic pressure in the radial direction when the shaft 111 rotates to form a radial dynamic pressure bearing thereby smoothly rotating the rotor 120 Can support.

The upper and lower radial dynamic grooves 114 and 115 may be any one of a herringbone shape, a spiral shape, and a thread shape, and any shape may be used as long as it generates radial dynamic pressure.

The sleeve 112 may include a circulation hole 117 formed to communicate the upper and lower portions of the sleeve 112. The circulation hole 117 may maintain the equilibrium by dispersing the pressure of the oil in the fluid dynamic bearing assembly 110, and discharges bubbles, etc. present in the fluid dynamic bearing assembly 110 by circulation. can do.

Here, the lower end of the sleeve 112 may be provided with a stopper 111a protruding radially outward at the lower end of the shaft 111. The stopper 111a may be engaged with the lower end surface of the sleeve 112 to limit the lifting of the shaft 111 and the rotor 120.

In addition, the cover member 113 is coupled to the lower axial direction of the sleeve 112 to cover the shaft hole to prevent the leakage of oil (lubricating fluid) may be provided. The cover member 113 may function as a bearing that receives oil in the shaft hole of the sleeve 112 and supports the lower surface of the shaft 111 as it is.

Since the hub 121 is coupled to the shaft 111 and constituting the fluid dynamic bearing assembly 110 with a rotating member that rotates in association with the shaft 111, the rotor 120 may be configured as follows. The rotor 120 will be described in detail.

The rotor 120 is a rotating structure rotatably provided with respect to the stator 130. The rotor 120 may include a hub 121 having a ring-shaped magnet 127 on its inner circumferential surface corresponding to the core 131 at a predetermined interval.

In other words, the hub 121 is a rotating member that is coupled to the upper end of the shaft 111 and rotates in conjunction with the shaft 111.

Here, the magnet 127 may be provided as a permanent magnet that alternately magnetizes N and S poles in a circumferential direction to generate a magnetic force of a predetermined intensity.

In addition, the hub 121 is a first cylindrical wall portion 122 to be fixed to the upper end of the shaft 111, a disc portion 123 extending radially outward from the end of the first cylindrical wall portion 122, It may include a second cylindrical wall portion 124 protruding downward from the radially outer end of the disc portion 123, the magnet 127 may be coupled to the inner peripheral surface of the second cylindrical wall portion 124. In addition, the hub 121 may include a disk mounting portion 125 protruding radially outward from a lower end of the second cylindrical wall portion 124.

The hub 121 may include a main wall portion 126 extending downward in the axial direction so as to correspond to an upper outer portion of the sleeve 112. In more detail, it may be provided with a main wall portion 126 which extends downward from the disc portion 123 in the axial direction. A gas-liquid interface sealing the oil may be formed between the outer side of the sleeve 112 and the inner side of the circumferential wall 126.

In addition, the inner surface of the circumferential wall 126 is tapered so that the gap between the outer surface of the sleeve 112 and the outer circumferential surface of the sleeve 112 becomes wider toward the lower axial direction, thereby facilitating sealing of the oil. The outer surface of the sleeve 112 may be tapered.

Further, the outer surface of the circumferential wall portion 126 may be formed to correspond to the upper surface 136 of the mounting portion 134 protruding upward from the base member 133.

A thrust dynamic pressure groove 116 may be formed at a portion where the hub 121 and the sleeve 112 face each other. The thrust dynamic pressure groove 116 may be provided in a spiral, herringbone, or spiral shape, and the thrust dynamic pressure groove 116 is not limited in shape as long as it can generate dynamic pressure.

The thrust dynamic groove 116 may generate a thrust fluid dynamic pressure when the shaft 111 rotates relative to the sleeve 112 to form a thrust dynamic bearing between the hub 121 and the sleeve 112. Can be.

The stator 130 may include a core 131, a coil 132, and a base member 133.

In other words, the stator 130 may be a fixing member having a coil 132 generating an electromagnetic force of a predetermined magnitude when power is applied and a plurality of cores 131 through which the coil 132 is wound.

The core 131 is fixedly disposed on an upper portion of the base member 133 on which a printed circuit board (not shown) on which a pattern circuit is printed is disposed, and the upper surface of the base member 133 corresponding to the coil 132 A plurality of coil holes having a predetermined size may be formed to expose the coil 132 downward. The coil 132 may be electrically connected to the printed circuit board (not shown) to receive external power.

In addition, the fluid dynamic pressure bearing assembly 110 may be mounted on the base member 133. The base member 133 may be manufactured by die casting using aluminum (Al) as a material, and may also be manufactured by plastic working (eg, press working) a steel sheet. .

The base member 133 may include a mounting part 134 protruding upward in the axial direction. The core 131 may be mounted on an outer side surface of the mounting unit 134, and the sleeve 112 may be fitted and fixed to an inner side surface thereof. In addition, the upper portion 136 of the inner surface of the mounting portion 134 may be formed so that the outer surface of the main wall portion 126 to face. Between the circumferential wall portion 126 and the upper portion 136 of the mounting portion 134 facing each other may be formed at a sufficiently narrow interval to form a labyrinth seal (Labyrinth seal).

Meanwhile, the disk 141 may be mounted to the hub 121 and the disk 141 may be fixed by the clamp 145 in the spindle motor 100 according to the exemplary embodiment of the present invention.

As shown in FIG. 1, one or more disks 141 may be mounted on the disk mounting unit 125 of the hub 121. When two or more disks 141 are mounted, a spacer 143 may be interposed between the disks 141 to maintain the gap of the disks 141.

The disk 141 mounted on the hub 121 may be fixed to the hub 121 by a clamp 145 mounted by a screw coupling, such as a fixing screw 147. That is, the disk 141 which is located at the uppermost side in the axial direction among the one or more disks 141 may be firmly fixed by being pressed downward in the axial direction by the clamp 145.

In this case, in the spindle motor 100 before mounting the disk 141, the clamp 145, or the like, the hub 121 is in a state where the deflection does not occur in the axially downward direction (see (a) of FIG. 2). In the spindle motor 100 after mounting 141, the clamp 145, and the like, the hub 121 sags downward in the axial direction (see FIG. 2B). Therefore, when deflection of the hub 121 occurs, the parallelism of the opposing surfaces of the magnet 127 mounted on the hub 121 and the core 131 mounted on the base member 133 may be shifted.

In the spindle motor 100 according to an embodiment of the present invention, the magnet 127 is mounted to the hub 121 in parallel with the axial direction, and the core 131 is mounted in the longitudinal direction perpendicular to the axial direction. .

Therefore, in the embodiment of the present invention, the outer end in the radial direction of the core 131 in the spindle motor 100 after the disk 141, the clamp 145, and the like can be parallel to the magnet 127. In the spindle motor 100 according to the outer end of the core 131 may be provided in a cut shape (see Figure 3). Thus, in the spindle motor 100 according to an embodiment of the present invention, the opposing surfaces of the magnet 127 and the core 131 may be inclined with each other so as to have a wider gap toward the lower side in the axial direction.

Alternatively, in the spindle motor 100 after the disk 141, the clamp 145, and the like are mounted, the outer end of the core 131 may be parallel to the magnet 127. In the spindle motor 100 according to the outer end of the core 131 may be provided in a shape bent toward the axial direction downward (see Fig. 4). Thus, in the spindle motor 100 according to an embodiment of the present invention, the opposing surfaces of the magnet 127 and the core 131 may be inclined with each other so as to have a wider gap toward the lower side in the axial direction.

In the embodiment of Figures 1 to 4, the hub has been described centering on the axial rotational structure in which the rotation is coupled to the shaft, it is, of course, also applicable to the axial fixed structure in which the hub is coupled to the sleeve to rotate.

5 is a schematic cross-sectional view of a disk drive apparatus using a spindle motor according to an embodiment of the present invention.

Referring to FIG. 5, the recording disk driving apparatus 800 in which the spindle motor 100 is mounted according to an embodiment of the present invention is a hard disk driving apparatus, and the spindle motor 100, the head conveying unit 810, and the housing ( 820).

The spindle motor 100 has all the features of the spindle motor according to the present invention described above and can mount the recording disk 830.

The head conveyance unit 810 may convey a magnetic head 815 for detecting information of the recording disk 830 mounted on the spindle motor 100 to a surface of a recording disk to be detected.

Here, the magnetic head 815 may be disposed on the support portion 817 of the head conveyance portion 810.

The housing 820 includes a motor mounting plate 822 and a top cover 830 for shielding the upper portion of the motor mounting plate 822 to form an internal space for accommodating the spindle motor 100 and the head conveying unit 810. [ 0.0 > 824 < / RTI >

100: Spindle motor
110: fluid dynamic bearing assembly
120: Rotor
130: stator

Claims (9)

A base member;
A sleeve mounted to the base member;
A shaft rotatably mounted to the sleeve;
A hub mounted to an upper end of the shaft and rotating together with the shaft and provided with a magnet; And
And a core mounted on the base member, the core wound around an outer circumferential surface thereof, and mounted to face the magnet.
Opposite surfaces of the magnet and the core are inclined to each other such that the gap becomes wider toward the lower side in the axial direction. The method of claim 1,
The hub is inclined downward in the axial direction when the disk is mounted on the hub and the clamp is fixed to the disk. 3. The method of claim 2,
The opposite side surfaces of the magnet and the core are parallel to each other after the hub is inclined downward in the axial direction. The method of claim 1,
And the core is mounted perpendicular to the axial direction in the radial direction. The method of claim 1,
The magnet is mounted to the spindle motor parallel to the axial direction. The method of claim 1,
The core is a spindle motor, the surface facing the magnet is cut. The method of claim 1,
The core is a spindle motor, the surface facing the magnet is bent downward in the axial direction. A fixing member;
A rotating member mounted to rotate relative to the fixing member;
A magnet mounted to the rotating member; And
And a core mounted on the fixing member, the coil wound around an outer circumferential surface thereof, and mounted to face the magnet.
Opposite surfaces of the magnet and the core are inclined to each other such that the gap becomes wider toward the lower side in the axial direction. The spindle motor of claim 1, wherein the disk is rotated by a power source applied through the substrate.
A magnetic head for recording and reproducing data of the disk; And
And a head conveyer for moving the magnetic head to a predetermined position on the disk.
KR1020120087940A 2012-08-10 2012-08-10 Spindle motor and hard disc drive including the same KR20140021414A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120087940A KR20140021414A (en) 2012-08-10 2012-08-10 Spindle motor and hard disc drive including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120087940A KR20140021414A (en) 2012-08-10 2012-08-10 Spindle motor and hard disc drive including the same

Publications (1)

Publication Number Publication Date
KR20140021414A true KR20140021414A (en) 2014-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120087940A KR20140021414A (en) 2012-08-10 2012-08-10 Spindle motor and hard disc drive including the same

Country Status (1)

Country Link
KR (1) KR20140021414A (en)

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