KR20130114884A - Spindle motor and hard disk drive including the same - Google Patents

Spindle motor and hard disk drive including the same Download PDF

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Publication number
KR20130114884A
KR20130114884A KR1020120037285A KR20120037285A KR20130114884A KR 20130114884 A KR20130114884 A KR 20130114884A KR 1020120037285 A KR1020120037285 A KR 1020120037285A KR 20120037285 A KR20120037285 A KR 20120037285A KR 20130114884 A KR20130114884 A KR 20130114884A
Authority
KR
South Korea
Prior art keywords
magnet
spindle motor
sleeve
shaft
facing
Prior art date
Application number
KR1020120037285A
Other languages
Korean (ko)
Inventor
김재혁
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 KR1020120037285A priority Critical patent/KR20130114884A/en
Publication of KR20130114884A publication Critical patent/KR20130114884A/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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds
    • 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

PURPOSE: A spindle motor and a hard disk drive including the same are provided to reduce the radial vibration of a rotating member. CONSTITUTION: A spindle motor includes a sleeve (112), a base member (133), a hub (121), and a magnet. A sleeve has a shaft (111) which is protruded in the upwardly axial direction, and has a bearing gap which is filled with oil by being formed between shafts supporting the shaft to be rotatable. The base member is equipped with a mounting unit (136) which is protruded in the upper side axial direction for the sleeve to be fixed on the inside of the mounting unit. The hub is fixed on the upper side of the shaft, and comprises a main wall unit (126). The magnet is provided on at least one side between the outside of the main wall unit and the inside of the mounting unit.

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 driving device capable of driving the disk, and a small motor is used for the disk driving device.

The compact motor has a fluid dynamic bearing assembly, and a bearing gap is formed between the rotating member and the fixed member of the fluid dynamic bearing assembly by a predetermined interval, and the fluid is generated from the oil by interposing oil in the bearing gap. The rotary member is supported by the pressure.

The oil is filled in the bearing gap between the rotating member and the fixing member, and the oil is sealed while forming a gas-liquid interface at a predetermined position.

Here, since the spindle motor using the fluid dynamic air ring assembly forms a dynamic pressure bearing by oil (lubricating fluid) interposed between the fixed member and the rotating member, vibration or vibration of the rotating member occurs due to external impact or vibration, and thus rotation. There is a problem that the rotational reliability of the member may be degraded.

The prior art document described below discloses a suction yoke 35 which interacts with the rotor magnet 43 to prevent over-injury of the hub 42, but this does not reduce the radial vibration of the rotating member. .

Korean Laid-Open Patent Publication No. 2011-0073402

The present invention is to solve the above problems, to provide a spindle motor that can reduce the radial vibration of the rotating member by the additional force acting in the radial direction.

Spindle motor according to an embodiment of the present invention is a shaft protruding upward in the axial direction and filled with oil in a bearing gap formed between the shaft and the sleeve for supporting the shaft rotatably; A base member having a mounting portion protruding upward in an axial direction and fixed to the inner surface of the mounting portion; A hub fixed to an upper side of the shaft, the inner side having a circumferential wall portion at least partially facing the outer side of the sleeve and the outer side extending axially downward to at least a portion facing the inner side of the mounting portion; And a magnet provided on at least one of an outer surface of the circumferential wall portion facing each other and an inner surface of the mounting portion to prevent radial vibration of the member rotating in a magnetic interaction between the mating members facing each other. have.

In the spindle motor according to an embodiment of the present invention, the mating member facing the magnet may be formed of at least a portion of the mating member facing the magnet.

In the spindle motor according to an embodiment of the present invention, the magnet is provided in a ring shape and may be provided in a circumferential direction on at least one of an outer side surface of the circumferential wall portion and an inner side surface of the mounting portion.

In the spindle motor according to an embodiment of the present invention, a labyrinth seal may be formed between the circumferential wall portion and the mounting portion facing each other.

In the spindle motor according to an embodiment of the present invention, a gas-liquid interface may be formed between the outer surface of the sleeve and the inner surface of the circumferential wall.

Spindle motor according to another embodiment of the present invention is a fixed member that is mounted so that the rotation member is mounted to the rotational axis of the motor relative system; And a member which is provided on at least a portion of an axial surface in which the fixing member and the rotating member face each other, and which is provided on at least one surface of the fixing member and the rotating member to rotate in a magnetic interaction with a mating member facing each other. It may include; a magnet to prevent the radial vibration of the.

In one embodiment of the present invention, a hard disk drive includes a spindle motor according to an embodiment of the present invention for rotating a disk by a power applied through a substrate; A magnetic head for recording and reproducing data of the disk; And a head driver for moving the magnetic head to a predetermined position on the disk.

The present invention provides a spindle motor capable of reducing vibrations that may occur in the radial direction with the addition of a simple member.

1 is a schematic cross-sectional view showing a spindle motor according to the first embodiment of the present invention,
2 is a schematic perspective view showing a base member of the spindle motor according to the first embodiment of the present invention,
3 is a schematic cross-sectional view showing a spindle motor according to a second embodiment of the present invention,
4 is a schematic perspective view showing a hub of the spindle motor according to the second embodiment of the present invention;
5 is a schematic cross-sectional view showing a spindle motor according to a third embodiment of the present invention,
6 is a conceptual diagram illustrating a magnet arrangement relationship of a spindle motor according to a third embodiment of the present invention.
7 is a schematic cross-sectional view of a disk drive apparatus 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 the first embodiment of the present invention, Figure 2 is a schematic perspective view showing a base member of the spindle motor according to the first embodiment of the present invention.

1 and 2, the spindle motor 100 according to the first 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 a 121, a base member 133, and a core 131 on which the coil 132 is wound. It may also include a magnet 141 to reduce the vibration in the radial direction.

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.

First, when defining a term for the direction, the axial direction refers to the up and down direction with respect to the shaft 111, as seen 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 addition, in the following description, the rotating member is a rotating member including a shaft 111, a rotor 120 including a hub 121, a magnet 125 mounted thereto, and the fixing member is other than the rotating member. The member may be a member fixed relative to the rotating member such as the sleeve 112, the stator 130, the base member, and the like.

In addition, the communication path with the outside at the interface of the oil means a passage that is connected to the outside of the motor at the oil interface and the air may be allowed to enter the communication path.

The sleeve 112 may support the shaft 111 such that an upper end of the shaft 111 protrudes upward in the axial direction. The main sleeve 112-1 may be formed by forging Cu or Al, or sintering Cu—Fe alloy powder or SUS powder. However, the present invention is not limited thereto and may be manufactured in various ways.

Here, the shaft 111 is inserted to have a small gap with the shaft hole of the sleeve 112 serves as a bearing gap (C), the bearing gap is filled with oil and the outer diameter of the shaft 111 and the At least one of the inner diameter of the sleeve 112 may be provided up and down, and the rotation of the rotor 120 may be smoothly supported by the radial dynamic pressure bearing formed by the radial dynamic pressure groove 114 when the shaft 111 rotates.

The radial dynamic pressure groove 114 is formed on the inner surface of the sleeve 112 that is inside the shaft hole of the sleeve 112, the shaft 111 when the shaft 111 is rotated the sleeve 112 Pressure is formed to rotate smoothly and spaced apart from each other at a predetermined interval.

However, the radial dynamic pressure groove 114 is not limited to being provided on the inner side of the sleeve 112 as mentioned above, it is also possible to be provided on the outer diameter of the shaft 111, the number is also limited Make sure you don't.

The radial dynamic pressure groove 114 may be any one of a herringbone shape, a spiral shape, and a screw shape, and the shape may be any shape as long as it generates a radial dynamic pressure.

The sleeve 112 may include a circulation hole 117 formed to communicate the upper and lower portions of the sleeve 112 so that the pressure of the oil in the fluid dynamic bearing assembly 110 may be dispersed to maintain equilibrium. In addition, the air bubbles and the like existing in the fluid dynamic bearing assembly 110 may be moved to be discharged by circulation.

Here, the lower end of the sleeve 112 is provided with a stopper 111a provided to protrude radially outward at the lower end of the shaft 111 so that the stopper 111a is caught by the lower end surface of the sleeve 112 and the shaft It is possible to limit the injuries of the 111 and the rotor 120.

The spindle motor 100 according to the first embodiment of the present invention utilizes a fluid bearing, and is generally provided with a pair of radial dynamic grooves 114 up and down to form two fluid dynamic bearings for stability of rotation. can do. However, in the case of a spindle motor using a fluid dynamic pressure bearing, since the rotating member must float to a predetermined height so as to be able to rotate without contacting the bottom plate (in this embodiment, the cover member 113) It can be pumped downward.

Alternatively, thrust dynamic pressure grooves may be provided to form thrust dynamic pressure bearings. Referring to FIG. 1, a thrust dynamic pressure groove may be provided on a bottom surface of the shaft 111 or an upper surface of the cover portion such that a thrust dynamic pressure bearing is formed between the shaft 111 and the cover member 113. Thrust dynamic pressure grooves may be provided on the top surface of the stopper 111a or the bottom surface of the sleeve 112 so that a thrust dynamic pressure bearing is formed between the top surface of the 111a and the bottom surface of the sleeve 112.

On the other hand, between the upper and lower radial dynamic pressure groove 114, the bearing gap between the sleeve 112 and the shaft 111 is formed in at least one of the sleeve 112 and the shaft 111 is wider than the other portion The groove portion reservoir portion 115 may be provided. Although the reservoir portion 115 is illustrated in the circumferential direction on the inner circumferential surface of the sleeve 112 in the drawing, the present invention is not limited thereto, and the reservoir portion 115 may be provided in the circumferential direction on the outer circumferential surface of the shaft 111.

Meanwhile, a cover member 113, which receives oil, may be coupled to the sleeve 112 while maintaining a gap in a lower axial direction of the sleeve 112.

The cover member 113 may function as a bearing for receiving oil in the gap between the sleeve 112 and supporting 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, and a hub 121 having an outer circumferential surface of a ring-shaped magnet 125 corresponding to each other at a predetermined interval with the core 131 to be described later. ) May be included.

In other words, the hub 121 may be a rotating member coupled to the shaft 111 to rotate in conjunction with the shaft 111.

Here, the magnet 125 may be provided as a permanent magnet in which the N pole and the S pole are alternately magnetized in the 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 125 may be coupled to the inner peripheral surface 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 for sealing 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 portion 126 is formed to be tapered so that the gap with the outer surface of the sleeve 112 is widened toward the lower side in the axial direction to facilitate the sealing of oil. In addition, the outer surface of the sleeve 112 may be formed to be tapered to facilitate the sealing of oil.

Further, the outer surface of the circumferential wall portion 126 may be formed to correspond to the inner surface 136 of at least a portion of the mounting portion 134 protruding upward from the base member 133. In addition, a magnetic force may be formed between the circumferential wall portion 126 and the mounting portion 136 facing each other to prevent vibration or vibration in the radial direction. This will be described later in the description of the stator 130.

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

In other words, the stator 130 may be a fixed structure including a coil 132 for generating a predetermined magnitude of electromagnetic force when power is applied and a plurality of cores 131 on which the coil 132 is wound.

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

The outer circumference of the sleeve 112 is fixed to the base member 133 and the core 131 to which the coil 132 is wound can be inserted and the inner surface of the base member 133 or the sleeve 112 may be coated with an adhesive.

In addition, the base member 133 is provided with a mounting portion 134 protruding upward in the axial direction, the core 131 is mounted on the outer surface, the sleeve 112 described above is fixed to a portion of the inner surface. The other part 136 may be formed to face the outer surface of the main wall portion 126.

In addition, a magnetic force may be formed between the circumferential wall portion 126 and the mounting portion 136 facing each other to prevent vibration or vibration in the radial direction.

That is, the magnet 141 may be provided on the inner surface of the mounting part 136 facing the main wall part 126 so that the main wall part 126 and the attraction force may be generated. Accordingly, a portion of the circumferential wall portion 126 that faces the magnet 141 may be formed of a magnetic material. Alternatively, an additional member of magnetic material may be fixed to an outer surface of the main wall 126.

In addition, the magnet 141 is provided in a ring shape so that the magnetic force is formed in the front direction may be continuously provided in the circumferential direction on the inner surface of the mounting portion 136. Of course, the magnet 141 may be formed to be continuously arranged in the circumferential direction so that a plurality of pieces of the magnet 141 may have a predetermined interval even though the magnet 141 is not continuous in the circumferential direction.

In addition, the circumferential wall portion 126 and the mounting portion 136 facing each other may be formed at narrow intervals to form a labyrinth seal.

3 is a schematic sectional view showing a spindle motor according to the second embodiment of the present invention, and FIG. 4 is a schematic perspective view showing a hub of the spindle motor according to the second embodiment of the present invention.

3 and 4, the spindle motor according to the second embodiment of the present invention is different from the first embodiment in that the magnet 142 is provided on the outer surface of the main wall portion 126. Since the configurations are all the same, only different configurations can be described in detail, and description of the same configuration can be omitted.

The outer surface of the main wall portion 126 may be formed to correspond to the inner surface 136 of at least a portion of the mounting portion 134 protruding upward from the base member 133.

In addition, the base member 133 is provided with a mounting portion 134 protruding upward in the axial direction, the core 131 is mounted on the outer surface, the sleeve 112 described above is fixed to a portion of the inner surface. The other part 136 may be formed to face the outer surface of the main wall portion 126.

In addition, a magnetic force may be formed between the circumferential wall portion 126 and the mounting portion 136 facing each other to prevent vibration or vibration in the radial direction.

That is, the magnet 142 may be provided on the outer surface of the main wall part 126 facing the mounting part 136 so that the mounting part 136 and the attraction force may be generated. Accordingly, a portion of the mounting portion 136 that faces the magnet 142 may be formed of a magnetic material. Alternatively, an additional member of magnetic material may be fixed to the outer surface of the mounting portion 136.

In addition, the magnet 142 may be provided in a ring shape so that the magnetic force is formed in the front direction, and may be continuously provided in the circumferential direction on the outer surface of the main wall part 126. Of course, the magnet 142 may be formed to be continuously arranged in the circumferential direction so that a plurality of pieces of the magnet 142 may have a predetermined interval even though the magnet 142 is not continuous in the circumferential direction.

In addition, the circumferential wall portion 126 and the mounting portion 136 facing each other may be formed at narrow intervals to form a labyrinth seal.

5 is a schematic cross-sectional view illustrating a spindle motor according to a third embodiment of the present invention, and FIG. 6 is a conceptual diagram illustrating a magnet arrangement relationship of the spindle motor according to the third embodiment of the present invention.

5 and 6, the spindle motor according to the third exemplary embodiment of the present invention has a magnet 142 in that both the outer surface of the main wall portion 126 and the inner surface of the mounting portion 136 are provided. Since only the differences with the first and second embodiments are all the same, other configurations are the same, and only the configurations with differences can be described in detail and the description of the same configuration can be omitted.

The outer surface of the main wall portion 126 may be formed to correspond to the inner surface 136 of at least a portion of the mounting portion 134 protruding upward from the base member 133.

In addition, the base member 133 is provided with a mounting portion 134 protruding upward in the axial direction, the core 131 is mounted on the outer surface, the sleeve 112 described above is fixed to a portion of the inner surface. The other part 136 may be formed to face the outer surface of the main wall portion 126.

In addition, a magnetic force may be formed between the circumferential wall portion 126 and the mounting portion 136 facing each other to prevent vibration or vibration in the radial direction.

That is, the magnets 143a and 143b may be provided on the outer surface of the circumferential wall portion 126 and the inner surface of the mounting portion 136 that face each other.

In other words, magnets 143a and 143b are provided on the outer side surface of the circumferential wall portion 126 and the inner side surface of the mounting portion 136, which face each other, thereby attracting force between the mounting portion 136 and the circumferential wall portion 126. Or repulsive force can be generated. Since the magnet must be provided with the north pole and the south pole essentially, the attraction force or repulsive force can be applied depending on the arrangement of the magnets facing each other.

That is, when the N and S poles of the magnets 143a and 143b are arranged in the axial direction as shown in FIG. 6A and 6B, the same polarity is provided in the magnets 143a and 143b facing each other. They may be arranged to face each other (a) or to face different polarities (b). In the former case, there is a difference that mutual repulsive force acts, and in the latter case, mutual attraction force acts, but both can form a magnetic force in the radial direction to reduce vibration or vibration of the rotating member.

Next, in the case where the N pole and the S pole of the magnets 143a and 143b are formed so as to be arranged in the radial direction as shown in FIG. 6 (c) (d), the same in the magnets 143a and 143b facing each other. The polarities may face each other (c), or the other polarities may face each other (d). In the former case, there is a difference that mutual repulsive force acts, and in the latter case, mutual attraction force acts, but both can form a magnetic force in the radial direction to reduce vibration or vibration of the rotating member.

In addition, the magnets 143a and 143b are provided in a ring shape so that the magnetic force is formed in all directions, and are continuously provided in the circumferential direction on the inner surface of the mounting portion 136 and the outer surface of the circumferential wall portion 126. Can be. Of course, the magnets 143a and 143b may be formed so as to be continuously arranged in the circumferential direction so that a plurality of pieces of the magnets 143a and 143b may have a predetermined interval even though they are not continuous in the circumferential direction.

In addition, the circumferential wall portion 126 and the mounting portion 136 facing each other may be formed at narrow intervals to form a labyrinth seal.

Meanwhile, although the magnets are provided in the main wall part 126 that is a part of the rotating member and the mounting part 136 that is a part of the fixing member in FIG. 1 to FIG. 6, the present invention is not limited thereto and the fixing member and the rotating member face each other. As long as it is a part to which a magnet is formed, a radial vibration and a vibration can be reduced.

That is, the magnet is provided on at least a portion of the axial surfaces of the fixing member and the rotating member facing each other, provided on at least one surface of the fixing member and the rotating member magnetic mutually between the mating member facing It is possible to prevent radial vibration of the rotating member.

Referring to FIG. 7, the recording disk driving apparatus 800 in which the spindle motors 100, 200 and 300 are mounted according to the present invention is a hard disk driving apparatus, and the spindle motors 100, 200 and 300 are provided. The head transfer unit 810 and the housing 820 may be included.

The spindle motors 100, 200 and 300 have all the features of the motor of the present invention as described above, and can carry a recording disc 830.

The head transfer unit 810 may transfer the head 815 for detecting information of the recording disc 830 mounted on the spindle motors 100, 200 and 300 to the surface of the recording disc to be detected.

Here, the head 815 may be disposed on the support part 817 of the head transfer part 810.

The housing 820 of the motor mounting plate 822 and the motor mounting plate 822 to form an inner space for accommodating the spindle motor 100, 200, 300 and the head transfer unit 810. It may include a top cover 824 to shield the top.

100, 200, 300: spindle motor
110: fluid dynamic bearing assembly
111: shaft
112: sleeve
113: cover member
120: Rotor
121: hub
122: first cylindrical wall portion
123: disc
124: second cylindrical wall portion
130: stator
141,142,143a, 143b: magnet

Claims (7)

A sleeve protruding upward in the axial direction and filled with oil in a bearing gap formed between the shaft and supporting the shaft rotatably;
A base member having a mounting portion protruding upward in an axial direction and fixed to the inner surface of the mounting portion;
A hub fixed to an upper side of the shaft, the inner side having a circumferential wall portion at least partially facing the outer side of the sleeve and the outer side extending axially downward to at least a portion facing the inner side of the mounting portion; And
A spindle motor including a magnet provided on at least one of an outer surface of the circumferential wall portion facing each other and an inner surface of the mounting portion to prevent radial vibration of the member rotating in a magnetic interaction between the mating members facing each other. .
The method of claim 1,
The mating member facing the magnet is at least a portion facing the magnet is a spindle motor formed of a magnetic material.
The method of claim 1,
The magnet is provided in a ring shape is provided in the circumferential direction on at least one of the outer surface of the circumferential wall portion and the inner surface of the mounting portion.
The method of claim 1,
And a labyrinth seal between the circumferential wall portion and the mounting portion that face each other.
The method of claim 1,
And a gas-liquid interface is formed between the outer surface of the sleeve and the inner surface of the circumferential wall.
A fixed member in which a shaft system of the motor is mounted and the rotating member is mounted to be relatively rotatable; And
A member which is provided on at least a portion of an axial surface in which the fixing member and the rotating member face each other, and which is provided on at least one surface of the fixing member and the rotating member to rotate in a magnetic interaction with a mating member facing each other. And a magnet to prevent radial vibration of the spindle motor.
The spindle motor according to any one of claims 1 to 6, wherein the disk rotates by a power source applied through the substrate;
A magnetic head for recording and reproducing data of the disk; And
And a head driver for moving the magnetic head to a predetermined position on the disk.
KR1020120037285A 2012-04-10 2012-04-10 Spindle motor and hard disk drive including the same KR20130114884A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120037285A KR20130114884A (en) 2012-04-10 2012-04-10 Spindle motor and hard disk drive including the same

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