KR20130066035A

KR20130066035A - Spindle motor

Info

Publication number: KR20130066035A
Application number: KR1020110132695A
Authority: KR
Inventors: 한청운
Original assignee: 엘지이노텍 주식회사
Priority date: 2011-12-12
Filing date: 2011-12-12
Publication date: 2013-06-20

Abstract

PURPOSE: A spindle motor is provided to prevent the eccentricity generation of a turntable by forming a through hole combined with a protrusion. CONSTITUTION: A bearing assembly(20) includes a bearing and a bearing house. The bearing is inserted into a rotation axis(10). The bearing house includes the bearing. A stator(30) is fixed with the bearing housing and includes a core and a coil. A yoke is combined with the rotation axis. A magnet is plated in the yoke facing the core. A rotor(40) includes the yoke and the magnet. A turntable(70) is combined with the yoke. A first combination unit is formed in one of the turntable and the yoke. A second combination unit combined with the first combination unit is formed in one of the turntable and the yoke.

Description

Spindle Motors {SPINDLE MOTOR}

The present invention relates to a spindle motor.

In recent years, optical drive devices (ODDs) for recording data on optical disks or reading data recorded on optical disks have been widely used.

Generally, an optical drive device includes a spindle motor for rotating an optical disk at high speed, an optical pickup module for reading data from or writing data to a rotating optical disk, and a stepping motor for driving the optical pickup module. do.

The spindle motor for rotating the optical disk at high speed operates with a rotating shaft, a bearing housing accommodating a bearing supporting the rotating shaft, a stator including a core wound around the bearing housing, a stator including a coiled winding coil, and a yoke and a stator coupled to the rotating shaft. The rotor includes a magnet and a turn table disposed on an upper surface of the yoke and coupled to the rotating shaft and the yoke.

Conventional turn tables are press-fit to the rotating shaft to reinforce the mechanical strength of the spindle motor, and the yoke and the turn table are bonded to each other by an adhesive.

However, when the turntable and the yoke of the conventional spindle motor are bonded to each other using an adhesive, eccentricity is generated by the application position of the adhesive, the application amount of the adhesive, and the like, and vibration and noise are generated when the rotor is rotated at a high speed.

In addition, when the adhesive is used to bond the turntable and the yoke, the turntable may be easily separated from the yoke by the external force, the height of the turntable may be changed, or rotational run out may occur.

The present invention provides a spindle motor that firmly couples the turntable and the yoke without using an adhesive to prevent rotation unevenness, vibration and noise from occurring.

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 includes a bearing assembly including a bearing into which the rotating shaft is inserted and a bearing housing accommodating the bearing; A stator fixed around the bearing housing and including a core and a coil wound around the core; A rotor including a yoke coupled to the rotating shaft and a magnet disposed on an inner side of the yoke facing the core; And a turn table coupled to the top plate of the yoke, wherein one of the turn table and the yoke is provided with a first coupling part, and the other of the turn table and the yoke is coupled with the first coupling part. 2 joining portions are formed.

According to the spindle motor according to the present invention, by forming a through-hole coupled to the protrusions or protrusions in the yoke and the turn table to combine the yoke and the turn table without an adhesive to prevent the occurrence of eccentricity of the turn table according to the high-speed rotation of the turn table It has the effect of preventing noise and vibration and suppressing or preventing the occurrence of rotational unevenness.

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 a plan view of the yoke of FIG. 1.
4 is a cross-sectional view taken along the line II ′ of FIG. 3.
5 is a cross-sectional view of a spindle motor according to another embodiment of the present invention.
FIG. 6 is an enlarged view of a portion 'B' of FIG. 5.
7 is a plan view illustrating the yoke of FIG. 5.
FIG. 8 is a cross-sectional view taken along the line II ′ of FIG. 7.

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 a plan view of the yoke of FIG. 1. 4 is a cross-sectional view taken along the line II ′ of FIG. 3.

1 to 4, the spindle motor 100 includes a rotating shaft 10, a bearing assembly 20, a stator 30, a rotor 40, and a turn table 70. In addition, the spindle motor 100 may further include a base plate 50, a circuit board 60, and a guard unit 80.

The bearing assembly 20 includes a bearing 21 and a bearing housing 24.

The bearing 21 has a rotation shaft hole in which the rotation shaft 10 is inserted and supports the rotation shaft 10. The bearing 21 may comprise, for example, an oil impregnated sintered bearing.

The bearing housing 24 houses the bearing 21. The bearing housing 24 includes, for example, a bottom plate 22 and a side plate 23. The side plate 23 extends from the edge of the bottom plate 22 and thereby the bearing housing 24 is formed in a cylindrical shape with an upper surface opened.

The stator 30 is fixed around the bearing housing 24. Specifically, the stator 30 is pressed into the side plate 23 of the bearing housing 24.

The stator 30 includes a core 32 and a coil 34.

The core 32 has a through hole inserted into the outer peripheral surface of the side plate 23 of the bearing housing 24 in the center portion. The core 32 is formed by overlapping a plurality of core pieces formed with core portions projecting radially from the outside, and the outer circumferential surface of the side plate 23 of the bearing housing 24 has a core formed by each through hole formed in each core piece ( 32) is inserted into the opening. The coil 34 is wound around the core portion.

The rotary shaft 10 is inserted into the rotary shaft hole of the bearing 21 of the bearing assembly 20, the rotary shaft 10 is rotatably supported by the bearing 21.

2 to 4, the rotor 40 includes a yoke 42 and a magnet 48.

The yoke 42 is formed in a cylindrical shape with a lower opening. The yoke 42 includes a top plate 44 and a side plate 45.

At the rotation center of the upper plate 44 of the yoke 42, a yoke burring portion 42a press-fitted with the outer circumferential surface of the rotation shaft 10 is formed.

The yoke burring part 42a is formed in the direction toward the bearing 21 from the center of the upper plate 44 of the yoke 42, for example, and the yoke burring part 42a is outside the rotating shaft 10 by press-fitting. Are coupled to the sides. As a result, the yoke 42 is rotated together with the rotation shaft 10.

In one embodiment of the present invention, the upper plate 44 of the yoke 42 is formed with a plurality of first coupling portions 46 formed at positions spaced apart from the center of rotation of the top plate 44, the first coupling portion 46 ) Are arranged in a circular shape on the top plate (44).

The first coupling portion 46 includes a burring portion 46a. The burring portion 46a has a hollow pipe shape, and the burring portion 46a is disposed in a direction facing the yoke burring portion 42a from the top plate 44 of the yoke 42, that is, the ten table 70 is disposed. Protrude in the direction.

The magnet 48 is disposed facing the core 32 on the inner side surface of the yoke 42 side plate 45 that is bent from the top plate 44 of the yoke 42 to face the core 32.

Referring to FIG. 1, the turn table 70 serves to record data or to support an optical disk on which data is recorded.

The turn table 70 is disposed on the upper surface 44 of the yoke 42 coupled to the rotation shaft 10, and the turn table 70 is coupled to the rotation shaft 10 and the yoke 42. The turn table 70 may be formed by processing a metal plate or by injecting a synthetic resin.

The second coupling portion 76 is formed on the turn table 70. The second coupling portion 76 is a through hole into which the burring portion 46a of the first coupling portion 46 is inserted, and the diameter of the second coupling portion 76 is the burring portion 46a of the first coupling portion 46. It may be formed below the outer peripheral surface diameter of.

In the state where the burring portion 46a of the first coupling portion 46 formed on the yoke 42 is fitted to the second coupling portion 76 formed on the turn table 70, the rivets pass through the hollow of the burring portion 46a. 77 is inserted and the yoke 42 and the turntable 70 are coupled to each other by machining the rivet 77.

Although in one embodiment of the present invention is shown and described to couple the turn table 70 and yoke 42 to each other using rivets 77, the burring portion 46a of the first coupling portion 46 is different. ) May be press-fit into the second coupling part 76.

Referring back to FIG. 1, the base plate 50 is press-fitted into the side plate 23 of the bearing housing 24 to which the core 32 of the stator 30 is coupled, and the bearing housing 24 to the base plate 50. Burring part for press-fitting into the side plate 23 of () is formed.

The circuit board 60 is disposed on the base plate 50, and the circuit board 60 is electrically connected to the coil 34 of the stator 30.

The careful unit 80 is movably coupled to the rotary shaft 10, and the careful unit 80 is disposed on the upper portion of the turn table 70 coupled to the rotary shaft 10. The careful unit 80 serves to fix the optical disk and fix the rotation center of the optical disk to the rotation center of the rotation shaft.

An elastic member such as a coil spring that elastically supports the guard unit 80 is disposed between the guard unit 80 and the turn table 70.

5 is a cross-sectional view of a spindle motor according to another embodiment of the present invention. FIG. 6 is an enlarged view of a portion 'B' of FIG. 5. 7 is a plan view illustrating the yoke of FIG. 5. FIG. 8 is a cross-sectional view taken along line II ′ of FIG. 7. The spindle motor according to another embodiment of the present invention has substantially the same configuration as the spindle motor shown in FIGS. 1 to 4 except for the structure of the turntable and the yoke. Therefore, redundant description of the same configuration will be omitted, and the same names and the same reference numerals will be given to the same configurations.

The spindle motor 100 includes a rotating shaft 10, a bearing assembly 20, a stator 30, a rotor 40, and a turn table 70. In addition, the spindle motor 100 may further include a base plate 50, a circuit board 60, and a guard unit 80.

5 to 8, a plurality of first coupling parts 78 are formed from a lower surface of the turn table 70 facing the yoke 42, and the first coupling part 78 is a turn table 70. It may include a protrusion protruding from the lower surface of the). The first coupling parts 78 including the protrusions are arranged in a circular position spaced apart from the rotation center of the turn table 70 by a predetermined distance.

On the other hand, the second coupling portion 47 is formed on the upper surface 44 of the yoke 42 corresponding to the first coupling portion 78 protruding from the lower surface of the turn table 70, the second coupling portion 47 For example, may include a through hole penetrating the upper surface 44 of the yoke 42.

The first coupling portion 78 including the protrusion may be coupled to the second coupling portion 47 including the through hole, and the first coupling portion 78 may be pressed into the second coupling portion 47.

Although in the exemplary embodiment of the present invention, the first coupling portion 78 is formed on the turn table 70, and the second coupling portion is press-fitted with the first coupling portion 78 on the upper surface 44 of the yoke 42. Although the forming portion 47 is illustrated and described, the first engaging portion 78, which is different from the projecting portion, is coupled to the second engaging portion 47, and then the first engaging portion protruding from the second engaging portion 47 ( The first engagement portion 78 may be coupled to the yoke 42 by changing the shape 78 by thermal fusion.

As described in detail above, the yoke and the turntable form a through hole coupled to the protrusion or the protrusion, thereby coupling the yoke and the turntable together without an adhesive to prevent eccentricity of the turntable, so that noise caused by the high-speed rotation of the turntable is achieved. And an effect of preventing vibration and suppressing or preventing occurrence of rotational unevenness.

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.

100 ... spindle motor 10 ... spindle
20 ... Bearing assembly 30 ... Stator
40 ... rotor 50 ... base plate
60 ... circuit board 70 ... turn table
80 ... caution unit

Claims

A bearing assembly including a bearing into which a rotating shaft is inserted and a bearing housing accommodating the bearing;
A stator fixed around the bearing housing and including a core and a coil wound around the core;
A rotor including a yoke coupled to the rotating shaft and a magnet disposed on an inner side of the yoke facing the core; And
It includes a turn table coupled to the top plate of the yoke,
The spindle motor of claim 1, wherein a first coupling part is formed at one of the turn table and the yoke, and a second coupling part is formed at the other one of the turn table and the yoke.

The method of claim 1,
The first coupling part includes a burring part protruding from the top plate of the yoke toward the turn table, and the second coupling part includes a through hole into which the burring part is inserted.

The method of claim 2,
The turntable and the yoke are coupled to the spindle motor by a rivet inserted into the hollow of the burring portion.

The method of claim 2,
The burring portion is a spindle motor is pressed into the inner surface formed by the through hole of the turn table.

The method of claim 2,
The first coupling part is a spindle motor having a plurality of circular arrangement based on the rotation center of the yoke.

The method of claim 1,
The first coupling part includes a protrusion protruding from the turn table toward the yoke, and the second coupling part includes a through hole into which the protrusion is inserted.

The method according to claim 6,
The protrusion motor is pressed into the upper surface of the yoke formed by the through hole.

The method according to claim 6,
And a plurality of protrusions arranged in a circle with respect to the rotation center of the turn table.

The method of claim 1,
And a center cone inserted into the rotation shaft and disposed on an upper surface of the turn table, and an elastic member interposed between the center cone and the turn table.