KR20130031664A - Spindle motor - Google Patents
Spindle motor Download PDFInfo
- 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
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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
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- 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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
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
In the rotating unit, the rotating
The
In addition, the
In addition, in the fixing part, the
In addition, the
More specifically, the radial dynamic pressure bearing portion (RB) is a minute gap is formed between the
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
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
In addition, the
In addition, an
In addition, the
The
In addition, the sealing
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
More specifically, the
In addition, the rotating
More specifically, the radial dynamic pressure bearing portion (RB) is a minute gap is formed between the
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
In addition, the second radial dynamic pressure bearing part RB2 includes a dynamic
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
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.
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120:
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Claims (10)
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.
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.
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.
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.
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 fixing unit further comprises a base fixed to the sleeve, the armature is mounted so as to face the magnet.
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.
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.
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 fixing unit further comprises a base fixed to the sleeve, the armature is mounted so as to face the magnet.
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 |
Family
ID=48180761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020110095371A KR20130031664A (en) | 2011-09-21 | 2011-09-21 | Spindle motor |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20130031664A (en) |
-
2011
- 2011-09-21 KR KR1020110095371A patent/KR20130031664A/en not_active Application Discontinuation
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