KR20130107507A - Base for spindle motor and spindle motor having the same - Google Patents

Abstract

PURPOSE: A base for a spindle motor and the spindle motor including the same are provided to improve the turbulent flow of air between a disc and the same, to reduce noise, and to lower non-repeatable runout (NRRO). CONSTITUTION: A base (150) for a spindle motor includes an air flow groove (151) at one side thereof, and the one side faces a disc. The air flow groove corresponds to the circumferential direction of the disc.

Description

Base for spindle motor and spindle motor comprising same {base for Spindle Motor and Spindle Motor having the same}

The present invention relates to a spindle motor base and a spindle motor comprising the same.

In general, a spindle motor used as a driving device for a recording disk such as a hard disk has a lubricating fluid such as oil stored between a rotating part and a fixed part at the time of rotation of the motor. It is used in various ways.

More specifically, since a spindle motor equipped with a hydrodynamic bearing that maintains axial rigidity of the shaft only by the centrifugal force of the lubricating oil is based on winsimic force, there is no metal friction and the stability is increased at high speeds, thereby reducing noise and vibration. It is mainly used in high-end optical disk devices and magnetic disk devices because it is less likely to occur and the high-speed rotation of the rotating body is smoother than a motor having a ball bearing.

The patent document described in the following prior art document is a spindle motor having a hydrodynamic bearing, in which a disk is attached to a hub and rotates. However, as a result of this, turbulence of air is generated between the base and the disk, which causes noise and non-repeatable runout (NRRO).

US Patent No. 6534890

The present invention has been made to solve the above problems, in the spindle motor, as the air flow groove is formed on one surface of the base opposite to the disk air is formed by the air flow groove formed in the base during the rotation of the disk It is to provide a base and spindle motor for a spindle motor that can be flowed and the turbulent flow of air generated between the disk and the base can be improved, thereby reducing noise and lowering non-repeatable runout (NRRO).

Spindle motor base according to an embodiment of the present invention is a spindle motor base on which the disk is mounted, the base is an air flow groove is formed on one surface facing the disk, the air flow groove corresponds to the circumferential direction of the disk It is formed to be.

The air flow groove of the base for the spindle motor according to an embodiment of the present invention may be formed in a plurality at equal intervals from the center of the base in the radially outward direction.

Spindle motor according to an embodiment of the present invention includes a rotating shaft, a hub and a magnet and a disk-mounted rotating portion, a sleeve for rotatably supporting the rotating shaft, a base to which the sleeve is coupled, opposed to the magnet and the base And a spindle motor fixedly coupled to the armature including an armature consisting of a core and a coil, and filled with oil to form a hydrodynamic bearing portion between the rotating part and the fixed part, wherein the base is disposed on one surface of the disk opposite to the disk. An air flow groove is formed, and the air flow groove is formed to correspond to the circumferential direction of the disk.

The air flow groove of the spindle motor according to an embodiment of the present invention may be formed in a plurality of equal intervals from the center of the base to the radially outward.

The base of the spindle motor according to an embodiment of the present invention may further include a pulling plate mounted on one surface opposite to 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 the spindle motor, as the air flow groove is formed on one surface of the base facing the disc, air is flowed by the air flow groove formed in the base when the disc rotates, which is generated between the disc and the base. The turbulent flow of air can be improved, resulting in a base and spindle motor for the spindle motor that can reduce noise and lower non-repeatable runout (NRRO).

1 is a plan view schematically showing a base for a spindle motor according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a spindle motor according to an 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 is also to be understood that the terms "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, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view schematically showing a base for a spindle motor according to an embodiment of the present invention. As shown, the base 50 is provided with an air flow groove 51 facing the disk (not shown) to be mounted. In addition, the air flow groove 51 may be formed to correspond to the rotation direction of the disk. That is, it may be formed to correspond to the circumferential direction of the disk, a plurality of radially outward from the center of the base 50 may be formed at equal intervals. 1 shows that three air flow grooves 51 are formed as one embodiment according to this.

In this way, the turbulent flow of the fluid generated between the disk and the base mounted on the spindle motor can be improved, thereby reducing the noise and lowering the non-repeatable runout (NRRO) base. You can get it.

2 is a cross-sectional view schematically showing a spindle motor according to an embodiment of the present invention. As shown in the drawing, the spindle motor 100 includes a rotating part including a rotating shaft 110, a hub 120 and a magnet 130, and a clamping member 170, a sleeve 140, a base 150, and an armature 160. ) And a cover including a cover 180, and oil, which is a working fluid, is injected to form a hydrodynamic bearing between the rotating part and the fixed part.

More specifically, in the rotating part, the rotating shaft 110 is coupled to the hub 120 at the upper portion, the clamping member 170 is coupled to the upper end, the fixing member 111 for fixing the clamping member 170 ) Is coupled to the rotating shaft (110). In addition, the fixing member 111 may be formed of a screw coupling member formed with a thread, in this case, the rotating shaft 110 is formed with a screw thread for the screw coupling member is screwed.

In addition, the hub 120 is a cylindrical portion 121 is fixed to the upper portion of the rotating shaft 110, a disc portion 122 extending radially outward from the cylindrical portion 121, and the disc portion 122 It consists of a side wall portion 123 extending downward in the axial direction of the rotary shaft at the radially outer end of the seal, and a sealing portion 124 extending downward in the axial direction of the rotary shaft, opposing the outer peripheral portion of the sleeve.

In addition, the magnet 130 having an annular ring shape is mounted on the inner circumferential surface of the side wall part 123 so as to face the armature 160 including the core 161 and the coil 162.

In addition, a disk D may be mounted on an outer circumferential surface of the side wall portion 123, and the disk D may be mounted on the hub such that a plurality of disks D do not overlap with each other by the space 190.

Next, in the fixing portion, the sleeve 140 supports the rotating shaft 110 to be rotatable. In addition, the sleeve 140 is a minute gap is formed between the rotating shaft 110, the oil is injected into the minute gap is formed a radial bearing (Radial Bearing) (not shown). In addition, the radial dynamic bearing may be formed on the upper and lower portions of the sleeve.

In addition, a dynamic pressure generating groove (not shown) is selectively formed at upper and lower portions of the inner circumferential surface of the sleeve 140 or upper and lower portions of the outer circumferential surface of the rotation shaft 110 to form the radial dynamic bearing portion RB.

In addition, the sleeve 140 has an oil circulation hole 141 connecting the upper and lower surfaces of the sleeve 140 so that the oil injected to form the hydrodynamic bearing portion circulates through the rotating shaft system. It can be formed in the direction.

In addition, an armature 160 including the core 161 and the coil 162 is fixed to the outer circumferential portion of the base 150 by indentation or adhesion to face the magnet 130.

In addition, the base 150 is formed with an air flow groove 151 on one surface opposite to the disk (D).

The air flow groove 151 may be formed to correspond to the rotation direction of the disk. That is, it may be formed to correspond to the circumferential direction of the disk, it may be formed in a plurality at equal intervals from the center of the base 150 to the radially outward.

In addition, a pulling plate 152 is mounted on the base 150 so as to face the magnet 130 with respect to the axial direction of the rotating shaft, and the pulling plate 152 is rotated by the attraction force of the magnet 130. Prevent injuries

The cover 180 is for sealing the oil injected to form the hydrodynamic bearing, and is coupled to the lower inner circumferential surface of the sleeve 140.

As such, as the spindle motor according to the exemplary embodiment of the present invention flows air by an air flow groove formed in the base during rotation of the disk, turbulent flow of the fluid generated between the disk and the base may be improved. This can reduce noise and lower non-repeatable runout (NRRO).

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 present invention. It is obvious that the modification and the modification are possible.

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.

50: base 51: air flow groove
100: spindle motor 110: rotation axis
111: fixing member 120: hub
121: cylindrical portion 122:
123: side wall portion 124: sealing portion
130: Magnet 140: Sleeve
141: oil circulation hole 150: base
151: air flow groove 152: pulling plate
160: armature 161: core
162 coil 170 clamping member
180: cover 190: spacer

Claims (5)

The base for the spindle motor on which the disk is mounted,
The base is an air flow groove is formed on one surface facing the disk, the air flow groove is formed for the spindle motor base to correspond to the circumferential direction of the disk.
The method according to claim 1,
The air flow groove
A base for a spindle motor, characterized in that formed in a plurality at equal intervals radially outward from the center of the base.
An arm including a rotating shaft, a hub and a magnet, and a disk-mounted rotating part, a sleeve for rotatably supporting the rotating shaft, a base to which the sleeve is coupled, an armature opposed to the magnet and fixedly coupled to the base and composed of a core and a coil. A spindle motor including a fixed part including oil, and a fluid dynamic bearing part formed between the rotating part and the fixed part by filling with oil,
The base has an air flow groove is formed on one surface facing the disk, the air flow groove is a spindle motor formed to correspond to the circumferential direction of the disk.
The method according to claim 3,
The air flow groove
Spindle motor, characterized in that formed in a plurality at equal intervals radially outward from the center of the base.
The method according to claim 3,
And the base further includes a pulling plate mounted on one surface opposite the magnet.

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