KR20130031664A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20130031664A
KR20130031664A KR1020110095371A KR20110095371A KR20130031664A KR 20130031664 A KR20130031664 A KR 20130031664A KR 1020110095371 A KR1020110095371 A KR 1020110095371A KR 20110095371 A KR20110095371 A KR 20110095371A KR 20130031664 A KR20130031664 A KR 20130031664A
Authority
KR
South Korea
Prior art keywords
sleeve
dynamic pressure
rotating shaft
spindle motor
pressure bearing
Prior art date
Application number
KR1020110095371A
Other languages
Korean (ko)
Inventor
김정우
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 KR1020110095371A priority Critical patent/KR20130031664A/en
Publication of KR20130031664A publication Critical patent/KR20130031664A/en

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Classifications

    • 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
    • G11B19/2036—Motors characterized by fluid-dynamic bearings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • 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 is provided to increase shafting stiffness by forming a radial dynamic pressure bearing unit in a minute gap between a sleeve and a thrust plate at a right angle to a shaft, thereby reducing RRO(Repeat Run Out). CONSTITUTION: A spindle motor(100) comprises a rotation unit including a rotary shaft(110), a thrust plate(120), a hub(130) and a magnet(140); a fixed unit including a sleeve(150), a base(160), an armature(170), a cover(180) and a sealing member(190); and a fluid dynamic pressure bearing unit formed by being filled with working fluid. The spindle motor is formed with a radial dynamic pressure bearing unit(RB) which is a fluid dynamic pressure bearing unit formed by being filled with working fluid. The radial dynamic pressure bearing unit is formed with a minute gap between the rotary shaft and the sleeve at a right angle to the rotary shaft; with a first fluid dynamic pressure bearing unit(RB1) by being filled with working fluid; with a minute gap between the thrust plate and the sleeve; and with a second dynamic pressure bearing unit(RB2) by being filled with working fluid.

Description

Spindle Motor

The present invention relates to a spindle motor.

In general, a spindle motor used as a driving device of a recording disk such as a hard disk includes a lubricating fluid such as oil stored in a gap between a rotating shaft and a sleeve when the motor rotates, and a fluid dynamic bearing using dynamic pressure generated therefrom. It is used in various ways.

More specifically, a spindle motor equipped with a fluid dynamic pressure bearing that maintains axial rigidity of the shaft only by the moving pressure of the lubricating oil by centrifugal force is based on the thrust force. Therefore, there is no metal friction, And it is mainly applied to high-end optical disc apparatuses and magnetic disc apparatuses, since the high-speed rotation of the rotating object is smoother than the motor having the ball bearing.

In addition, the spindle motor having a hydrodynamic bearing according to the prior art has a limit of axial rigidity as the radial hydrodynamic bearing portion is formed only at an interval between the rotating shaft and the sleeve opposite thereto, thereby reducing the repeat run out (RRO). It has a problem that cannot be solved.

The present invention has been made to solve the above problems, in addition to the radial dynamic bearing portion between the rotating shaft and the sleeve, the axial rigidity in forming the radial dynamic bearing portion in the minute interval of the sleeve and the thrust plate in the orthogonal direction of the rotating shaft It is to provide a spindle motor that can increase and, accordingly, reduce the repeat run out (RRO).

The spindle motor according to the first embodiment of the present invention comprises a rotating part including a rotating shaft, a hub, and a magnet, a fixing part including a sleeve supporting the rotating shaft and an armature opposed to the magnet, and forming a hydrodynamic bearing part. To the working fluid is filled, the rotating part includes a thrust plate coupled to the rotating shaft, the radial dynamic pressure bearing portion is formed in the minute interval of the sleeve and the thrust plate in the direction orthogonal to the rotating shaft.

In addition, the radial dynamic pressure bearing part has a dynamic pressure generating groove formed on an opposite surface of the thrust plate in the orthogonal direction of the rotation shaft in the sleeve.

In addition, the radial dynamic pressure bearing portion has a dynamic pressure generating groove formed on the surface opposite to the sleeve in the orthogonal direction of the rotation shaft in the thrust plate.

In addition, a minute gap is formed between the rotating shaft and the sleeve, the working fluid is filled in the minute gap is further formed a radial hydrodynamic bearing portion, the radial dynamic bearing portion is formed on the inner peripheral surface of the sleeve and the outer peripheral surface of the rotating shaft opposite thereto Optionally, a dynamic pressure generating groove is formed.

In addition, two dynamic pressure generating grooves are selectively formed at the upper and lower portions of the inner circumferential surface of the sleeve or at the upper and lower portions of the outer circumferential surface of the rotating shaft.

In addition, the fixing unit is fixed to the sleeve, the spindle motor further comprises a base on which the armature is mounted so as to face the magnet.

Spindle motor according to a second embodiment of the present invention comprises a rotating part including a rotating shaft, a hub and a magnet, a fixing part including a sleeve for supporting the rotating shaft and an armature opposed to the magnet, and forms a hydrodynamic bearing part. In order to fill the working fluid, the rotary shaft includes a rotary shaft portion inserted into the sleeve and the hub is coupled, and a flange portion extending in the radial direction of the rotary shaft portion to be located above the sleeve, A radial dynamic pressure bearing portion is formed at a small interval between the sleeve and the flange portion of the rotating shaft in an orthogonal direction of.

In addition, the radial dynamic pressure bearing portion has a dynamic pressure generating groove formed on an opposite surface of the flange portion in the orthogonal direction of the rotation shaft in the sleeve.

In addition, the radial dynamic pressure bearing portion has a dynamic pressure generating groove formed on the surface opposite to the sleeve in the orthogonal direction of the rotating shaft in the flange portion.

In addition, the fixing portion further includes a base fixed to the sleeve, the armature is mounted so as to face the magnet.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention, in addition to the radial dynamic bearing portion between the rotating shaft and the sleeve, the radial dynamic bearing portion is formed at the minute gap between the sleeve and the thrust plate in the orthogonal direction of the rotating shaft, thereby increasing the axial rigidity, and accordingly RRO (Repeat Run Out) To provide a spindle motor that can reduce the.

1 is a schematic cross-sectional view of a spindle motor according to a first embodiment of the present invention.
Figure 2 is a use state diagram schematically showing the dynamic pressure generated by the fluid dynamic bearing portion of the spindle motor shown in FIG.
3 is a schematic cross-sectional view of a spindle motor according to a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It will be further understood that terms such as " first, "" second," " one side, "" other," and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the coupling structure of the rotating shaft and the thrust plate and the spindle motor including the same.

1 is a schematic cross-sectional view of a spindle motor according to a first embodiment of the present invention. As shown in the drawing, the spindle motor 100 includes a rotating part including a rotating shaft 110, a thrust plate 120, a hub 130, and a magnet 140, a sleeve 150, a base 160, and an armature 170. ), The cover 180 and the fixing member including the sealing member 190, and the working fluid is filled to form a hydrodynamic bearing.

In the rotating unit, the rotating shaft 110 includes a rotating shaft 111 and a support 112. In addition, the hub 130 is coupled to the upper end of the rotary shaft 111, the thrust plate 120 is coupled between the hub 130 and the support 112.

The hub 130 is a cylindrical portion 131 is fixed to the upper end of the rotating shaft 110, a disk portion 132 extending radially outward from the cylindrical portion 131, the radially outer side of the disk portion 132 It consists of a side wall portion 133 extending downward in the axial direction of the rotation axis at the end.

In addition, the magnet 140 made of an annular ring shape is mounted on the inner circumferential surface of the side wall portion 133 so as to face the armature 170.

In addition, in the fixing part, the sleeve 150 supports the rotation shaft 110 to be rotatable, and the sleeve 150 is fixed to the base 160.

In addition, the spindle motor 100 according to the first embodiment of the present invention is formed with a radial hydrodynamic bearing portion RB, which is a hydrodynamic bearing portion by a working fluid.

More specifically, the radial dynamic pressure bearing portion (RB) is a minute gap is formed between the rotary shaft 110 and the sleeve 150 in the orthogonal direction of the rotary shaft 110, the working fluid is filled in the minute interval A first radial hydrodynamic bearing part RB1 is formed, a microgap is formed between the thrust plate 120 and the sleeve 150, and a working fluid is filled in the microgap, so that the second radial hydrodynamic bearing part RB2 is formed. ) Is formed.

To this end, the first radial dynamic pressure bearing portion (RB1) is made of a dynamic pressure generating groove is selectively formed on the inner peripheral surface of the sleeve and the outer peripheral surface of the rotating shaft opposite thereto. In addition, two dynamic pressure generating grooves may be selectively formed at the upper and lower portions of the inner circumferential surface of the sleeve or at the upper and lower portions of the outer circumferential surface of the rotating shaft.

In addition, the second radial dynamic pressure bearing part RB2 has a dynamic pressure generating groove 152 formed on an opposite surface of the thrust plate 120 in the orthogonal direction of the rotation shaft in the sleeve 150.

In addition, the second radial dynamic pressure bearing part RB2 is formed by forming a dynamic pressure generating groove (not shown) on an opposite surface of the sleeve 150 in the orthogonal direction of the rotation shaft 110 in the thrust plate 120. It may be.

In addition, the sleeve 150 has a fluid circulation hole 153 is connected to the upper and lower surfaces so that the working fluid (Oil) circulates in the axial direction of the rotation axis.

In addition, an armature 170 composed of a core 171 and a coil 172 is fixed to the outer circumferential portion of the base 160 by pressing or bonding, so as to face the magnet 140, and the base 160 as described above. The sleeve 150 is fixed to the inner circumferential portion of) by pressing or bonding.

In addition, the spindle motor 100 according to the first embodiment of the present invention is positioned to be opposed to the magnet 140 in the axial direction and fixed to the base 160 in order to prevent injuries of the hub 130. The suction plate 161 may be further included.

The cover 180 supports the lower end of the rotation shaft 110 and is fixed to the lower inner circumferential surface of the sleeve 150 to seal the working fluid injected to form the fluid dynamic bearing.

In addition, the sealing member 190 is coupled to the thrust plate 120 and the sleeve 150 to prevent the leakage of the working fluid. More specifically, the sealing member 190 supports the upper end of the thrust plate 120 and is coupled to the inner circumferential surface of the upper end of the sleeve 150.

Figure 2 is a use state diagram schematically showing the dynamic pressure generated by the fluid dynamic bearing portion of the spindle motor shown in FIG. As shown, dynamic pressure is generated by the first radial dynamic bearing part RB1 and the second radial dynamic bearing part RB2 as shown by the arrow. In addition, the rotational system rigidity is increased by the second radial dynamic pressure bearing part RB2, so that the RRO is reduced, thereby enabling stable driving.

3 is a schematic cross-sectional view of a spindle motor according to a second embodiment of the present invention. As shown, the spindle motor 200 according to the second embodiment does not have a thrust plate separately from the spindle motor 100 according to the first embodiment shown in FIG. It is implemented.

More specifically, the spindle motor 200 may include a rotating part including a rotating shaft 210, a hub 230, and a magnet 240, a sleeve 250, a base 260, an armature 270, a cover 280, and It consists of a fixed portion including a sealing member 290, the working fluid is filled to form a hydrodynamic bearing portion.

In addition, the rotating shaft 210 is composed of a rotating shaft portion 211 and the flange portion (212). The rotary shaft portion 211 is inserted into and coupled to the sleeve 250 and the hub 230 is coupled to the flange portion 212 of the rotary shaft portion 211 so as to be positioned above the sleeve 250. Extend radially. In addition, a radial dynamic pressure bearing portion is formed at a minute interval between the sleeve 250 and the flange portion 212 of the rotating shaft 210 in the direction perpendicular to the rotating shaft.

More specifically, the radial dynamic pressure bearing portion (RB) is a minute gap is formed between the rotating shaft 210 and the sleeve 250 in the orthogonal direction of the rotating shaft 210, the working fluid is filled in the small interval is filled A first radial hydrodynamic bearing portion RB1 is formed, a minute gap is formed between the flange portion 212 of the rotary shaft and the sleeve 250, and a working fluid is filled in the minute gap to form a second radial hydrodynamic bearing part ( RB2) is formed.

To this end, the first radial dynamic bearing portion (RB1) is made of a dynamic pressure generating groove is selectively formed on the inner peripheral surface of the sleeve 250 and the outer peripheral surface of the rotating shaft 210 opposite thereto. In addition, two dynamic pressure generating grooves 251 may be formed at upper and lower portions of the inner circumferential surface of the sleeve 250, or two may be selectively formed at upper and lower portions of the outer circumferential surface of the rotating shaft.

In addition, the second radial dynamic pressure bearing part RB2 includes a dynamic pressure generating groove 252 formed on an opposite surface of the flange part 212 of the rotation shaft in the sleeve 250 in the direction perpendicular to the rotation shaft.

In addition, the second radial dynamic pressure bearing part RB2 may have a dynamic pressure generating groove (not shown) on an opposite surface of the sleeve 250 in a direction orthogonal to the rotation shaft 210 in the flange portion 212 of the rotation shaft 210. ) May be formed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be apparent that modifications and improvements can be made by those skilled in the art.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100, 200: spindle motor 110, 210: axis of rotation
120: thrust plate 130, 230: hub
140, 240: Magnet 150, 250: Sleeve
160, 260: base 170, 270: armature
180, 280: cover 190, 290: sealing member

Claims (10)

A spindle motor comprising a rotating part including a rotating shaft, a hub and a magnet, a fixing part including a sleeve for supporting the rotating shaft and an armature opposed to the magnet, and a working fluid filled to form a hydrodynamic bearing part.
The rotating part includes a thrust plate coupled to the rotating shaft,
Spindle motor, characterized in that the radial dynamic pressure bearing portion is formed in the minute interval between the sleeve and the thrust plate in the direction perpendicular to the rotation axis.
The method according to claim 1,
And said radial dynamic pressure bearing portion is formed with a dynamic pressure generating groove formed on an opposite surface of said thrust plate in the orthogonal direction of said rotation shaft in said sleeve.
The method according to claim 1,
And said radial dynamic pressure bearing portion is formed with a dynamic pressure generating groove formed on an opposing surface of said sleeve in the orthogonal direction of said rotation shaft in said thrust plate.
The method according to claim 1,
A minute gap is formed between the rotating shaft and the sleeve, a working fluid is filled in the minute gap, and a radial dynamic bearing part is further formed. Spindle motor, characterized in that the dynamic pressure generating groove is formed.
The method of claim 4,
Two of the dynamic pressure generating grooves are formed on the upper and lower portions of the inner circumferential surface of the sleeve or on the upper and lower portions of the outer circumferential surface of the rotating shaft.
The method according to claim 1,
The fixing unit further comprises a base fixed to the sleeve, the armature is mounted so as to face the magnet.
A spindle motor comprising a rotating part including a rotating shaft, a hub and a magnet, a fixing part including a sleeve for supporting the rotating shaft and an armature opposed to the magnet, and a working fluid filled to form a hydrodynamic bearing part.
The rotation axis is
A rotating shaft portion inserted into the sleeve and coupled to the hub; And
A flange portion extending in a radial direction of the rotary shaft portion so as to be positioned above the sleeve portion,
Spindle motor, characterized in that the radial dynamic pressure bearing portion is formed in the minute interval of the sleeve and the flange portion of the rotary shaft in the orthogonal direction of the rotary shaft.
The method of claim 7,
And said radial dynamic pressure bearing portion is formed with a dynamic pressure generating groove in an opposite surface of said flange portion in the orthogonal direction of said rotational shaft in said sleeve.
The method of claim 7,
And said radial dynamic pressure bearing portion is provided with a dynamic pressure generating groove in a surface opposite to said sleeve in a direction orthogonal to said rotating shaft in said flange portion.
The method of claim 7,
The fixing unit further comprises a base fixed to the sleeve, the armature is mounted so as to face the magnet.
KR1020110095371A 2011-09-21 2011-09-21 Spindle motor KR20130031664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110095371A KR20130031664A (en) 2011-09-21 2011-09-21 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110095371A KR20130031664A (en) 2011-09-21 2011-09-21 Spindle motor

Publications (1)

Publication Number Publication Date
KR20130031664A true KR20130031664A (en) 2013-03-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110095371A KR20130031664A (en) 2011-09-21 2011-09-21 Spindle motor

Country Status (1)

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