KR20130015891A - Base assembly for motor and hard disk drive including the same - Google Patents

Base assembly for motor and hard disk drive including the same Download PDF

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Publication number
KR20130015891A
KR20130015891A KR1020110078213A KR20110078213A KR20130015891A KR 20130015891 A KR20130015891 A KR 20130015891A KR 1020110078213 A KR1020110078213 A KR 1020110078213A KR 20110078213 A KR20110078213 A KR 20110078213A KR 20130015891 A KR20130015891 A KR 20130015891A
Authority
KR
South Korea
Prior art keywords
base
magnet
motor
base assembly
disk
Prior art date
Application number
KR1020110078213A
Other languages
Korean (ko)
Inventor
이현철
전일근
최태영
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 KR1020110078213A priority Critical patent/KR20130015891A/en
Publication of KR20130015891A publication Critical patent/KR20130015891A/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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • 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
    • G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
    • 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 base assembly for a motor and a hard disk drive including the same are provided to fix the magnet of a voice coil motor to a base. CONSTITUTION: A motor base assembly includes a motor base(100), a magnet(120), and a separation preventing part(115). The magnet is arranged in the motor base. The separation preventing part is protruded from the base to restrain the movement of the magnet.

Description

Base assembly for motor and hard disk drive including the same

The present invention relates to a motor base assembly and a hard disk drive including the same, and more particularly, to a motor base assembly and a hard disk drive including the improved structure of a magnet for providing a driving force to the base and the magnetic head. It is about.

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

In such a hard disk drive, a base is provided with a head drive unit, that is, a head stack assembly (HSA), which allows the magnetic head to be moved on a disc, and the magnetic head rises a predetermined height from the recording surface of the disc by the head drive unit. It performs its function while moving to the desired position.

In addition, the head driving unit uses a voice coil motor (VCM) for driving force of the magnetic head, the voice coil motor (VCM) generates a driving force by the electromagnetic interaction of the coil and the magnets located above and below the coil. Let's go.

Here, the yoke is required for the coupling with the base and the magnetic flux density is improved, and the yoke should be firmly fixed to the base for reasons such as strong pulling force between the magnets and prevention of detachment due to external impact.

As described above, the yoke required for improving the fixing force and the magnetic flux density of the magnet of the voice coil motor (VCM) may be applied to a base manufactured by a die-casting method, but if the base itself has magnetism, the yoke May not be required.

That is, when the base is manufactured by using a press or forging method using a material having magnetic properties, the yoke applied to the base by a die-casting method may not be necessary.

In other words, when the base is provided with magnetism, the magnet used in the voice coil motor (VCM) may be directly coupled to the base, and in this process, the magnetism of the magnet should not be affected.

However, the magnetism of the magnet may be reduced in the heating process for bonding bonding when the magnet and the base are combined, and this phenomenon may lead to deterioration of the performance of the voice coil motor.

Therefore, when the magnet provided to the voice coil motor is directly coupled to the base, there is an urgent need to study that the magnetism of the magnet is not affected, and the coupling force is increased to prevent detachment by external impact.

An object of the present invention includes a base assembly for a motor to improve the performance and productivity by increasing the coupling force while not affecting the magnetism of the magnet when the magnet of the voice coil motor (VCM) directly coupled to the base; It is to provide a hard disk drive.

Motor base assembly according to an embodiment of the present invention is a motor base; A magnet disposed on the motor base to provide driving force to a magnetic head; And a departure prevention part protruding from the base to restrain the movement of the magnet.

The separation preventing part of the base assembly for a motor according to an embodiment of the present invention may be formed in plural to support an outer surface of the magnet.

The release preventing portion of the base assembly for a motor according to an embodiment of the present invention may be formed by recessing the bottom surface of the base and protruding the top surface.

The release preventing portion of the base assembly for a motor according to an embodiment of the present invention may support at least one of the upper surface and the outer surface of the magnet by pressing an end projecting to the upper surface of the base.

The separation preventing part of the base assembly for a motor according to an embodiment of the present invention may be formed by bending a predetermined region of the base.

The separation prevention part of the base assembly for a motor according to an embodiment of the present invention may be formed to protrude to the other surface by recessing a predetermined region of the bent one surface to support the outer surface of the magnet.

The outer surface of the magnet of the motor base assembly according to an embodiment of the present invention may be formed to be inclined downward in the outward direction.

One surface of the separation preventing part facing the outer surface of the magnet of the base assembly for a motor according to an embodiment of the present invention may correspond to each other.

The detachment preventing part of the base assembly for a motor according to an embodiment of the present invention may be formed such that the bottom surface of the base protrudes to protrude an upper surface, and one surface corresponds to an outer surface of the magnet by pressing the protruding portion.

The motor base of the motor base assembly according to an embodiment of the present invention may be formed by press working.

Hard disk drive according to another embodiment of the present invention is a motor base assembly; A spindle motor coupled to the motor base to rotate the disk; A magnetic head for recording and reproducing data of the disk; And a head driving unit which moves the magnetic head to a predetermined position on the disk by electromagnetic interaction by the magnet and the coil.

According to the motor base assembly and the hard disk drive including the same according to the present invention, the magnet of the voice coil motor (VCM) can be simply and firmly coupled to the base.

In addition, in the process of coupling the magnet of the voice coil motor to the base so that the magnet magnetism is not affected, it is possible to prevent performance degradation of the voice coil motor.

1 is a schematic exploded perspective view showing a hard disk drive including a base assembly for a motor according to an embodiment of the present invention.
Figure 2 is a schematic perspective view showing a base assembly for a motor according to an embodiment of the present invention.
Figure 3 is a schematic cross-sectional view showing a coupling process of the motor base and the magnet according to the line AA of Figure 2;
Figure 4 is a schematic cross-sectional view showing another coupling process of the motor base and the magnet according to the line AA of Figure 2;
5 to 8 is a schematic cross-sectional view showing another coupling process of the motor base and the magnet according to the line AA of FIG.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. 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 falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

1 is a schematic exploded perspective view showing a hard disk drive including a base assembly for a motor according to an embodiment of the present invention, Figure 2 is a schematic perspective view showing a base assembly for a motor according to an embodiment of the present invention. .

1 and 2, a hard disk drive 600 according to the present invention includes a base assembly for a motor 100 (hereinafter referred to as a base assembly), a spindle motor 200, and a head driving unit 300 for moving a magnetic head. It may include.

The base assembly 100 includes a base for motor 110 (hereinafter referred to as a base), a magnet 120 provided to a voice coil motor (VCM) 350, and a separation prevention part for coupling the magnet 120 to the base 110. 115 may be included.

First, when defining a term for a direction, an axial upper or lower direction may mean a direction from the upper surface of the base 110 toward the cover 500 or the opposite direction.

In the hard disk drive 600 according to the present invention, the base 110 may refer to a housing which forms an appearance together with the cover 500, and includes a disk arranging unit 112 and a magnet arranging unit 114. can do.

Here, the base 110 and the cover 500 may be coupled to a plurality of screws 501 are fastened to the holes 111 formed in the base 110.

The disk disposition unit 112 is a portion in which the disk D coupled to the spindle motor 200, which will be described later, is disposed and may be formed in a circular shape as a whole to correspond to the shape of the disk D.

In detail, the disc placement unit 112 may refer to an area in which a portion of the base 110 protrudes downward in the axial direction to accommodate the disc D.

The magnet disposition part 114 is a part to which the magnet 120 of the voice coil motor (VCM) 350 constituting the head driving part 300 is coupled, and the departure preventing part 115 is fixed to fix the magnet 120. Can be formed.

Here, the magnet 120 may provide a driving force to the magnetic head by electromagnetic interaction with the coil 310 provided to the voice coil motor (VCM, 350), the base 110 according to the present invention is magnetic Since it may be provided, the yoke, which is a separate fastening member, may not be required for coupling with the base 110 and increasing magnetic flux density.

In other words, the base 110 according to the present invention can be formed by a forging or pressing process, the plate-like steel, that is, the base, that is, cold rolled steel (SPCC, SPCE, etc.), hot rolled steel sheet, stainless steel or boron Alternatively, a lightweight alloy steel sheet such as magnesium alloy may be placed in a press die and manufactured by a predetermined press pressure.

That is, the shape of the internal space formed by the combination of the upper mold and the lower mold for press or forging is implemented in a shape corresponding to the base 110 according to the present invention to form the base 110 according to the present invention in one step. It can manufacture.

However, after the basic base shape is manufactured in one pressing process, the base 110 of the final book may be formed by bending and additional pressing processes.

Therefore, the base 110 according to the present invention is produced by a post-processing method to remove burrs generated by die-casting after die-casting of aluminum (Al). Alternatively, the base 110 itself may be provided with magnetism because it is manufactured by pressing a cold rolled steel sheet (SPCC, SPCE, etc.), hot rolled steel sheet, stainless steel, or a lightweight alloy steel sheet such as boron or magnesium alloy as a matrix. .

Therefore, the magnet 120 of the voice coil motor (VCM) 350 may be directly coupled to the base 110 without a yoke, which is a separate fastening member, for coupling with the base 110 and increasing magnetic flux density.

At this time, in order to directly fix the magnet 120 to the base 110, the base 110 may be provided with a departure prevention portion 115 protruding.

The departure preventing unit 115 may be formed in plural numbers to restrain the movement of the magnet 120, and may support the outer surface of the magnet 120 to restrain the movement of the magnet 120.

That is, the departure preventing unit 115 may be formed to correspond to the outer surface of the magnet 120, it may be pressed into the magnet 120 in the space formed by the departure preventing unit 115.

Therefore, the magnet 120 may be restrained in the axial direction and the horizontal movement by the departure preventing unit 115.

A manufacturing method and a structure of the departure preventing unit 115 will be described later in detail with reference to FIGS. 3 to 8.

The spindle motor 200 is for rotating the disk D, and is fixedly installed at the center of the disk arranging unit 112. The disk D may be coupled to the spindle motor 200 and may have a recording surface on which data is recorded by rotating with the rotation of the spindle motor 200.

Here, a clamp 210 for fastening the disk D to the spindle motor 200 may be fastened to the upper end of the spindle motor 200 by a screw 215.

In addition, although FIG. 1 illustrates a configuration in which one disk D is mounted on the spindle motor 200, this is merely an example, and one or more disks D may be mounted on the spindle motor 200. Can be. When a plurality of disks (D) is mounted in this way, a ring-shaped spacer for maintaining the distance between the disks (D) may be disposed between the disks (D).

The head driver 300 is called a head stack assembly (HSA), and mounts a magnetic head (not shown) and moves the magnetic head (not shown) to a predetermined position to record data on the disk D, or It may be a configuration for reading the data recorded on the disk (D).

The head driving unit 300 may be composed of a voice coil motor (VCM) 350, a swing arm 320, and a suspension 330, and the suspension 330 is a front end of the swing arm 320. It can be fixedly coupled to.

In addition, the head driving unit 300 may be rotatably coupled around the pivot axis of the base 110. When the disk D rotates at a high speed in the upper portion of the disk arrangement 112, the magnetic head ( Not shown) performs a function of reproducing or recording data on the recording surface of the disc D. FIG.

Here, the voice coil motor (VCM, 350) is configured to provide rotational power to the head drive unit 300, the voice coil motor (VCM, 350) is the upper side of the VCM coil 310 of the head drive unit 300 And magnets 120 and 130 disposed on the lower side.

 The magnet 130 disposed on the upper side of the VCM coil 310 may be coupled to the yoke 135 to increase the magnetic flux density and to fix the base 110, and the magnet 130 disposed on the lower side may be described above. As described above, the base 110 may be directly fixed to the base 110 by the separation preventing unit 115 formed in the magnet arrangement 114 of the base 110.

The voice coil motor (VCM) 350 is controlled by a servo control system, and according to Fleming's left hand law, due to the interaction of a current input by the VCM coil 310 and a magnetic field formed by the magnet 120. The head drive unit 300 is rotated about the pivot axis in the direction.

Here, the start command of the operation of the hard disk drive 600 according to the present invention is input, the disk D starts to rotate, the voice coil motor (VCM, 350) rotates the swing arm 320 in a counterclockwise direction The magnetic head (not shown) is moved onto the recording surface of the disc D.

On the contrary, when an operation stop command of the hard disk drive 600 is input, the voice coil motor VCM rotates the swing arm 320 clockwise so that a magnetic head (not shown) Get out of (D).

A magnetic head (not shown) off the recording surface of the disk D is parked in a lamp 340 provided on the outside of the disk D.

3 is a schematic cross-sectional view illustrating a coupling process between a motor base and a magnet according to line AA of FIG. 2.

Referring to FIG. 3, the base 110 including the disc placing portion 112 and the magnet placing portion 114 is formed by a pressing or forging process and an additional machining process (bending or pressing process).

Thereafter, the bottom surface of the magnet placement unit 114 is pressed to form the departure preventing unit 115 to recess the bottom surface of the magnet placement unit 114 (see FIG. 3A).

As described above, by recessing the bottom surface of the magnet placement unit 114, the top surface of the magnet placement unit 114 may protrude upward in the axial direction, and the protruding portion may constitute the departure preventing unit 115.

Here, the departure preventing unit 115 may be formed in plural to correspond to the outer surface of the magnet 120, the magnet 120 is pressed into the space formed by the departure preventing unit 115, the magnet 120 ) May be fixed to the base 110 (see FIGS. 3B and 3C).

As a result, the magnet 120 may be constrained in the axial direction and the horizontal direction by the separation preventing unit 115, and may improve the performance of the voice coil motor VCM 350.

In addition, since the adhesive is not required for the coupling of the magnet 120 and the base 110, it is possible to prevent the problem that the magnetism of the magnet 120 may be reduced due to the heating process for curing the adhesive.

In addition, when the magnet 120 is bonded to the base 110 by an adhesive, in order to prevent a decrease in magnetism of the magnet 120 as described above, the magnet in a non-magnetic state is bonded to the base by an adhesive and then hardened. Although it may be magnetized afterwards, in this case, there is a problem in that additional magnetization equipment is additionally required.

However, the base assembly 100 according to the present invention is coupled to the base 110 by a method of directly injecting the magnet 120 magnetized without adhesive into the inner space by the departure preventing unit 115, thereby separate magnetization. No equipment is required and the magnetism of the magnet 120 is reduced in advance.

4 is a schematic cross-sectional view showing another coupling process of a motor base and a magnet according to line AA of FIG. 2.

Referring to FIG. 4, the bottom surface of the magnet placement unit 114 is pressed to form the departure preventing portions 115a and 115b on the base 110 to dent the bottom surface of the magnet placement unit 114 (FIG. 4 (FIG. a)).

As described above, by recessing the bottom surface of the magnet placement unit 114, the top surface of the magnet placement unit 114 may protrude upward in the axial direction, and the degree of protrusion may be formed thicker than the thickness of the magnet 120 ( See FIG. 4 (b)).

Thereafter, the magnet 120 may be seated in an inner space formed by the protruding portion, and the end portion of the protruding portion may be pressed downward in the axial direction.

Therefore, the pressurized portion may contact the outer surface of the magnet 120 to support the outer surface of the magnet 120 more effectively (see FIG. 4C).

That is, the departure preventing part 115a may protrude from the upper surface of the base 110, and may maximize the supporting force for supporting the outer surface of the magnet 120 through pressure fixing to the lower side in the axial direction.

However, unlike the above, the end portion protruding from the upper surface of the base 110 may be supported by the pressing process toward the lower side in the axial direction, so that the upper surface of the magnet 120 may be supported. It may also function as a locking jaw to restrain the movement of the magnet 120 (see Fig. 4 (c ')).

5 to 8 is a schematic cross-sectional view showing another coupling process of the motor base and the magnet according to the line AA of FIG.

Referring to FIG. 5, the separation preventing part 115c for fixing the magnet 120 to the base 110 may be formed by cutting a predetermined area of the magnet disposing part 114 by punching and then bending the upper portion in the axial direction. (See FIG. 5 (a)).

That is, the departure preventing part 115c may be formed by bending a predetermined region of the magnet arranging part 114.

Here, the departure preventing part 115c formed by bending to the upper surface of the base 110 may have an inner space corresponding to or smaller than the outer surface of the magnet 120 (see FIG. 5 (b)).

Thereafter, the magnet 120 may be firmly coupled to the base 110 by pressing the magnet 120 into the inner space formed by the separation preventing part 115c.

Referring to FIG. 6, it may further include a protrusion 115d-1 for pressing and supporting the outer surface of the magnet 120 in comparison with the separation preventing unit 115c described with reference to FIG. 5.

That is, in the departure preventing part 115d-1 according to FIG. 6, the predetermined area of the magnet arranging part 114 is bent (see FIGS. 6 (a) and 6 (b)) in an inward direction. It may be provided with a projection 115d-1 projecting on the other surface by recessing (see Fig. 6 (c)).

Therefore, by maximizing the supporting force for supporting the outer surface of the magnet 120 of the departure preventing portion 115d due to the protrusion (115d-1), to improve the fixing force with the base 110 of the magnet 120 Can be.

Referring to FIG. 7, an outer surface of the magnet 120 ′ used in the voice coil motor VCM 350 may be inclined downward in an outward direction.

Therefore, the release preventing part 115e formed by pressing the end portion protruding from the upper surface of the base 110 downward in the axial direction may pressurize and support the outer surface of the magnet 120 ′ which is formed to be inclined.

At this time, since the outer surface of the magnet 120 'is formed to be inclined, the lower side of the magnet 120' is fixed to the base 110 more effectively by the engaging force with the end of the separation prevention portion 115e formed by being pressed. Can be.

Referring to FIG. 8, the departure preventing part 115f may be formed by pressing an end projecting from the upper surface of the base 110 downward in the axial direction, and the separation preventing part facing the outer surface of the magnet 120 ′. One surface of 115f may correspond to each other.

To this end, a separate jig G is required to press the outside of the departure preventing part 115f to the inside, and by inserting the departure preventing part 115f into the inner space of the jig G. The departure prevention part 115f may be bent inward.

Therefore, the detachment preventing part 115f and the outer surface of the magnet 120 'may be in contact with each other, and the magnet 120' may be stably fixed to the base 110.

Through the above embodiment, the motor base assembly 100 and the hard disk drive 600 including the same according to the present invention is a base having magnetic magnets 120 and 120 'of the voice coil motor (VCM, 350). Simple but firmly coupled to 110.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that such modifications or variations are within the scope of the appended claims.

100: base assembly for the motor 110: base base for the motor
112: disk arrangement section 114: magnet arrangement section
115, 115a, 115b, 115c, 115d, 115e, 115f: Breakaway prevention part
120: magnet 200: spindle motor
300: head drive portion 500: cover

Claims (11)

A motor base;
A magnet disposed on the motor base to provide driving force to a magnetic head; And
The base assembly for a motor comprising a; departure preventing portion protruding from the base to restrain the movement of the magnet.
The method of claim 1,
The base assembly for the motor to support the outer surface of the magnet is formed of a plurality of separation prevention portion.
The method of claim 1,
The departure prevention part is a base assembly for a motor is formed by recessing the bottom surface of the base and protruding the upper surface.
The method of claim 3,
The release preventing unit is a base assembly for a motor for supporting at least one of the upper surface and the outer surface of the magnet by pressing the end protruding to the upper surface of the base.
The method of claim 1,
The departure prevention part is a motor base assembly formed by bending a predetermined region of the base.
The method of claim 5,
The departure preventing part is formed to protrude to the other surface by recessing a predetermined region of the bent one surface to support the outer surface of the magnet.
The method of claim 1,
The outer surface of the magnet base assembly for the motor is formed inclined downward in the outward direction.
The method of claim 7, wherein
One side of the separation prevention portion facing the outer surface of the magnet base assembly for the motor corresponding to each other.
The method of claim 7, wherein
The release preventing part recesses the bottom surface of the base to protrude an upper surface, and pressurizes the protruding portion so that one surface is formed to correspond to the outer surface of the magnet.
The method of claim 1,
The base for the motor is formed by the press working base assembly for the motor.
A base assembly for a motor according to any one of claims 1 to 10;
A spindle motor coupled to the motor base to rotate the disk;
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 by electromagnetic interaction by the magnet and the coil.
KR1020110078213A 2011-08-05 2011-08-05 Base assembly for motor and hard disk drive including the same KR20130015891A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110078213A KR20130015891A (en) 2011-08-05 2011-08-05 Base assembly for motor and hard disk drive including the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110078213A KR20130015891A (en) 2011-08-05 2011-08-05 Base assembly for motor and hard disk drive including the same

Publications (1)

Publication Number Publication Date
KR20130015891A true KR20130015891A (en) 2013-02-14

Family

ID=47895608

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110078213A KR20130015891A (en) 2011-08-05 2011-08-05 Base assembly for motor and hard disk drive including the same

Country Status (1)

Country Link
KR (1) KR20130015891A (en)

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