KR20130060543A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20130060543A
KR20130060543A KR1020110126650A KR20110126650A KR20130060543A KR 20130060543 A KR20130060543 A KR 20130060543A KR 1020110126650 A KR1020110126650 A KR 1020110126650A KR 20110126650 A KR20110126650 A KR 20110126650A KR 20130060543 A KR20130060543 A KR 20130060543A
Authority
KR
South Korea
Prior art keywords
bearing
magnet
yoke
rotating shaft
suction
Prior art date
Application number
KR1020110126650A
Other languages
Korean (ko)
Inventor
송충현
Original Assignee
엘지이노텍 주식회사
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 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020110126650A priority Critical patent/KR20130060543A/en
Publication of KR20130060543A publication Critical patent/KR20130060543A/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
    • 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
    • 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
    • G11B2220/2537—Optical discs

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  • Motor Or Generator Frames (AREA)

Abstract

The spindle motor includes a bearing assembly including a bearing and a bearing housing that receives the bearing; A stator including a core coupled to the bearing housing and a coil wound around the core; A rotating shaft rotatably inserted into the bearing; A rotor including a yoke coupled to the rotating shaft and a magnet coupled to the yoke facing the core; And a suction magnet coupled to the outer circumferential surface of the rotating shaft facing the bearing assembly, wherein the yoke is provided with a magnet accommodating part to form a receiving groove accommodating the suction magnet.

Description

Spindle Motors {SPINDLE MOTOR}

The present invention relates to a spindle motor.

In recent years, technology development of an optical disk driver (ODD) for reading data recorded on an optical disk or recording data on an optical disk is in progress.

The optical disk driver includes a spindle motor, an optical pickup module, a stepping motor, and the like.

The spindle motor serves to rotate the optical disk at a very high speed, the stepping motor moves the optical pickup module in the radial direction of the optical disk, and the optical pickup module writes data to or reads data from the optical disk.

The spindle motor includes a rotating shaft which is rotated, the rotating shaft being coupled to the rotor and the rotor including a caution device coupled to the inner circumferential surface of the optical disk.

In the conventional spindle motor, the rotor is coupled to the rotating shaft, but when the coupling force of the rotor and the rotating shaft is weak, the rotor and the rotating shaft are relatively moved by an impact or vibration applied to the rotor or the rotating shaft from the outside, thereby causing a fatal driving failure. .

The present invention provides a spindle motor that prevents movement of the rotor and the rotating shaft by external shock and / or vibration to prevent the drive failure.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

In one embodiment, the spindle motor comprises a bearing assembly comprising a bearing and a bearing housing for receiving the bearing; A stator including a core coupled to the bearing housing and a coil wound around the core; A rotating shaft rotatably inserted into the bearing; A rotor including a yoke coupled to the rotating shaft and a magnet coupled to the yoke facing the core; And a suction magnet coupled to the outer circumferential surface of the rotating shaft facing the bearing assembly, wherein the yoke is provided with a magnet accommodating part to form a receiving groove accommodating the suction magnet.

According to the spindle motor according to the present invention, in order to improve the coupling strength of the rotor and the rotary shaft to the rotary shaft to which the rotor is coupled, the suction magnet is pressed and the suction magnet is coupled to the rotor, so that the rotor is rotated with respect to the rotary shaft by external shock or vibration. It has an effect of suppressing or preventing a defect generated by moving.

1 is a cross-sectional view of a spindle motor according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion 'A' of FIG. 1.
3 is an exploded perspective view illustrating the fixing part, the bearing assembly, and the washer of FIG. 1.
4 is a cross-sectional view of a spindle motor according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. The definitions of these terms should be interpreted based on the contents of the present specification and meanings and concepts in accordance with the technical idea of the present invention.

1 is a cross-sectional view of a spindle motor according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion 'A' of FIG. 1. 3 is an exploded perspective view illustrating the fixing part, the bearing assembly, and the washer of FIG. 1.

1 to 3, the spindle motor 600 according to an embodiment of the present invention includes a bearing assembly 100, a stator 300, a rotation shaft 400, a rotor 500, and a suction magnet 550. It includes. In addition, the spindle motor 600 may further include a base plate 200 for fixing the bearing assembly 100.

The bearing assembly 100 includes a bearing 110 and a bearing housing 120.

The bearing 110 is formed in a cylindrical shape having an outer circumferential surface and an inner circumferential surface facing the outer circumferential surface. In one embodiment of the present invention, the bearing 110 may include an oil-impregnated sintered alloy bearing.

The inner circumferential surface of the bearing 110 serves to rotatably support the rotating shaft 400 to be described later.

The bearing housing 120 has a cylindrical shape with an open top surface, and the bearing housing 120 includes a side plate 122 and a bottom plate 124. In addition, the bearing housing 120 may further include a washer 128 and a thrust bearing 130.

The side plate 122 of the bearing housing 120 is formed in a cylindrical shape.

The bottom plate 124 of the bearing housing 120 is formed at the bottom of the side plate 122. In one embodiment of the present invention, the bottom plate 124 is formed of an upper bottom plate facing the bottom of the bearing 110 and a lower bottom plate that is not in contact with the bottom of the bearing 110.

The thrust bearing 130 which is in contact with the end of the rotation shaft 400 is disposed on the lower bottom plate of the bearing housing 120, and the upper bottom plate formed on the upper bottom plate prevents the detachment of the rotation shaft 400 in a donut shape. Washer 128 is disposed. The diameter of the outer circumferential surface of the washer 128 is formed to a diameter less than or equal to the diameter of the outer circumferential surface of the bearing 130.

A flange portion 126 is formed at an open upper end of the bearing housing 120 into which the bearing 110 is inserted. The flange portion 126 extends from an upper end of the bearing housing 120 to an upper surface of the stator 300 to be described later. do. The flange part 126 presses the stator 300 to prevent the stator 300 from being separated from the bearing housing 120.

In one embodiment of the present invention, all of the flange portion 126 may press the stator 300 to fix the stator 300. Alternatively, a portion of the flange portion 126 may press the stator 300, and the rest of the flange portion 126 may extend to the upper surface of the bearing 110.

Referring back to FIG. 1, the stator 300 includes a core 310 and a coil 330.

The core 310 is coupled to the outer circumferential surface of the bearing housing 120, and is formed by stacking a plurality of core pieces having a thin thickness. A through hole in which the side plate 122 of the bearing housing 120 is inserted is formed at the center of the core 310, and the core 310 may be press-fitted to the outer circumferential surface of the bearing housing 120.

The coil 330 constituting the stator 300 is wound around the core 310.

The rotary shaft 400 is inserted into the rotary shaft hole of the bearing 110 so as to be rotatable, and the lower end of the rotary shaft 400 is disposed on the thrust bearing 130 disposed on the lower bottom plate of the bottom plate 124 of the bearing housing 120. Is placed on.

In addition, a washer 128 disposed on the upper bottom plate is disposed in the groove formed at the lower end of the rotating shaft 400, and the rotating shaft 400 may be prevented from being separated from the bearing 110 by the washer 128.

Referring back to FIG. 1, the rotor 500 includes a yoke 510 and a magnet 520.

The yoke 510 is formed in a cylindrical shape with a lower opening, and the yoke 510 includes an upper plate 512 and a side plate 516.

The yoke upper plate 512 is formed in a disc shape, and a yoke burring portion 514 is formed at the center of the yoke upper plate 512 to be coupled to the rotation shaft 400. In one embodiment of the present invention, the yoke burring portion 514 may be adhered to the rotating shaft 400 by pressing or adhesive.

Meanwhile, a magnet accommodating part 560 is formed around the yoke burring part 512 to form an accommodating groove 555 for accommodating the suction magnet 550 to be described later.

The storage groove 555 formed by the magnet housing 560 may be, for example, a donut-shaped space.

The magnet accommodating part 560 may be formed by protruding the periphery of the yoke burring part 514 of the yoke upper plate 512 from the inner side of the yoke upper plate 512 toward the outer side facing the inner side. The magnet accommodating part 560 and the yoke burring part 512 may be formed by press working, respectively.

In one embodiment of the present invention, the thickness of the magnet housing portion 560 and the upper plate 512 of the yoke 510 formed by press working or the like are formed to the same thickness.

The side plate 516 of the yoke 510 extends from the edge of the top plate 512 of the yoke 510 in a direction surrounding the core 310.

The magnet 520 is disposed facing the core 310 on the inner side of the side plate 516 of the yoke 510.

The suction magnet 560 is coupled to the rotary shaft 400, and the suction magnet 560 is coupled to the rotary shaft 400 corresponding between the bearing assembly 120 and the rotor 500. The suction magnet 560 is adhered to the outer circumferential surface of the rotating shaft 400 by, for example, press fitting and / or an adhesive.

In one embodiment of the present invention, the suction magnet 560 is, for example, is formed in a donut shape that is pressed into the rotary shaft 400 and accommodated in the receiving groove 555 formed by the magnet receiving portion 560. Alternatively, the suction magnet 560 may be formed in various shapes accommodated in the receiving groove 555 formed by the magnet accommodating part 560 in addition to the donut shape.

An adhesive 557 may be applied to the accommodating groove 555 of the magnet accommodating part 560, as shown in FIG. 2, and the magnet accommodating part 560 and the suction of the yoke 510 are applied by the adhesive 557. The magnets 560 are firmly bonded to each other. Meanwhile, the adhesive 557 is disposed in a space formed by the yoke burring portion 514, the suction magnet 560, and the rotation shaft 400 of the yoke 510.

In one embodiment of the present invention, the suction magnet 560 is fixed to the outer circumferential surface of the rotating shaft 400 by an indentation or adhesive, and the magnet receiving portion 560 of the yoke 510 is coupled to the suction magnet 560 Even if an impact or vibration is applied to the rotating shaft 400 or the rotor 500 from the outside, the defect that the rotor 500 is moved from the rotating shaft 400 can be prevented.

In one embodiment of the present invention, in order to prevent relative movement of the rotor 500 and the rotating shaft 400, the suction magnet 560 should be coupled to the outer circumferential surface of the rotating shaft 400, the suction magnet 560 is a suction force In order to generate the magnetic material, a magnetic material may be disposed in the bearing 110 facing the suction magnet 560. Alternatively, in order to work with the suction magnet 560, a portion of the flange portion 126 of the bearing housing 120, which is a magnetic body, may be extended toward the upper surface of the bearing 110 as described above.

1 and 3, the bearing assembly 120 may include a fixing part 150 in order to further improve the suction force by the suction magnet 560. The fixing part 150 may include a magnetic material that works with the suction magnet 560 to generate a suction force.

The fixing part 150 may include a first fixing part 152 and a second fixing part 154.

The first fixing part 152 may be formed, for example, in a cylindrical shape, and the first fixing part 152 may be interposed between the outer surface of the bearing 110 and the inner surface of the bearing housing 120. The first fixing part 152 may be press-fitted between the bearing 110 and the bearing housing 120.

The lower end of the first fixing part 152 press-fitted between the bearing 110 and the bearing housing 120 is disposed on the upper bottom plate of the bottom plate of the bearing housing 120, and the inner circumferential surface of the first fixing part 152 is It is disposed facing the outer surface of the washer 128, which can reduce the volume of the bearing housing 120 somewhat.

The second fixing part 154 may extend or bend from the upper end of the first fixing part 152 to face the suction magnet 560 along the upper surface of the bearing 110.

In one embodiment of the present invention, the second fixing part 154, for example, may be formed in a doughnut shape. Alternatively, the second fixing part 154 may be formed in various shapes other than the donut shape.

On the other hand, the spindle motor 600 according to an embodiment of the present invention may further include a base plate 200.

The base plate 200 includes a circuit board 220 connected to the coil 330 of the stator 300. The base plate 200 has a burring portion 234 coupled to the outer circumferential surface of the bearing housing 120. The end of the burring portion 234 supports the lower surface of the core 310 of the stator 300.

Although the suction magnet 550 is housed in the magnet accommodating part 560 formed by pressing the upper plate 512 of the yoke 510 in one embodiment of the present invention, as shown in FIG. 4. The magnet accommodating part 560 reduces the thickness of the portion corresponding to the suction magnet 550 by an etching process or a half blanking process instead of a press process to form an accommodating groove, and fixes the suction magnet 550 to the accommodating groove by an adhesive or the like. You may.

As described in detail above, in order to improve the coupling strength of the rotor and the rotating shaft to the rotating shaft to which the rotor is coupled, the suction magnet is pressed and the suction magnet is coupled to the rotor to move the rotor with respect to the rotating shaft by external shock or vibration. It has the effect of suppressing or preventing the defects generated by.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

600 ... spindle motor 100 ... bearing assembly
200 ... base plate 300 ... stator
400 ... rotation shaft 500 ... rotator
550 suction magnet

Claims (12)

A bearing assembly comprising a bearing and a bearing housing accommodating the bearing;
A stator including a core coupled to the bearing housing and a coil wound around the core;
A rotating shaft rotatably inserted into the bearing;
A rotor including a yoke coupled to the rotating shaft and a magnet coupled to the yoke facing the core; And
A suction magnet coupled to an outer circumferential surface of the rotating shaft facing the bearing assembly,
And a magnet accommodating portion formed in the yoke to form an accommodating groove for accommodating the suction magnet. The method of claim 1,
And the magnet accommodating portion is formed by protruding an inner surface of the yoke corresponding to the suction magnet toward an outer surface facing the inner surface. The method of claim 1,
The magnet accommodating portion is formed by reducing the thickness of the yoke corresponding to the suction magnet. The method of claim 1,
And said suction magnet, said yoke and said rotating shaft housed in said magnet housing portion are bonded by an adhesive. 5. The method of claim 4,
The adhesive is a spindle motor filled in the space formed by the yoke, the suction magnet and the rotary shaft. The method of claim 1,
A portion of the upper end of the bearing housing presses the core and the remainder of the upper end of the bearing housing faces the suction magnet. The method of claim 1,
And a fixing part including a first fixing part interposed between the bearing housing and the bearing and a second fixing part extending from the first fixing part to an upper surface of the bearing and disposed to face the suction magnet. motor. The method of claim 7, wherein
The first fixing part is formed in a cylindrical shape, the second fixing part is a spindle motor formed in a doughnut shape. 9. The method of claim 8,
The fixing unit spindle motor including a magnetic material for generating a suction force by the suction magnet. The method of claim 7, wherein
The bearing assembly includes a washer disposed on a lower surface of the bearing and inserted into a groove formed on an outer circumferential surface of the rotating shaft, wherein an outer circumferential surface of the washer is disposed in an inner circumferential surface of the first fixing part. The method of claim 1,
The suction magnet is a spindle motor pressed into the outer peripheral surface of the rotating shaft. The method of claim 1,
And a base plate having a burring portion coupled to the bearing housing.
KR1020110126650A 2011-11-30 2011-11-30 Spindle motor KR20130060543A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110126650A KR20130060543A (en) 2011-11-30 2011-11-30 Spindle motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110126650A KR20130060543A (en) 2011-11-30 2011-11-30 Spindle motor

Publications (1)

Publication Number Publication Date
KR20130060543A true KR20130060543A (en) 2013-06-10

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ID=48858953

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110126650A KR20130060543A (en) 2011-11-30 2011-11-30 Spindle motor

Country Status (1)

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KR (1) KR20130060543A (en)

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