KR100267696B1 - A motor for disk driving - Google Patents

Abstract

PURPOSE: A disk driving motor is provided to reduce a vibration generated from the disk driving motor rotating at a high speed. CONSTITUTION: A rotating shaft(8) is supported by a bearing(13) inserted to a bearing holder(12). A turntable(6) is installed at an upper end portion of the rotating shaft for supporting a disk. A bush(7) is inserted to the rotating shaft to fix the disk. A rotor yoke(2) is fixed to the rotating shaft at the lower end of the turntable by the bush. A driving magnet(3) and an armature core(11) are installed on an inner side of the rotor yoke. A race yoke(4) is installed between the turntable and the rotor yoke for being fixed at the upper end of the rotor yoke. A magnet is formed between the turntable and the race yoke. A balance magnet(14) is formed on an external side of the magnet for facing each other. Herein, an inner diameter of the balance magnet is larger than an outer diameter of the magnet.

Description

Disc Drive Motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive motor, and more particularly, to a disk drive motor that dynamically reduces vibration generated by a disk drive motor rotating at high speed.

The disc drive motor according to the prior art has a rotary shaft 8 supported by a bearing 13 fitted to a bearing holder 12 and a bush on the rotary shaft 8, as shown in the sectional view of the main part of FIG. Rotor yoke 2 fixed by (7), drive magnet (3) installed inside the rotor yoke (2), and turn-table (6) mounted on the upper end of the rotary shaft (8) And a ball formed of a plurality of bearing balls between the turn-table 6 and the rotor yoke 2, and formed between the turn-table 6 and the rotor yoke 2, and the motor Between the magnet 10 for holding the ball by magnetic force when stopped and the turn-table 6 and the rotor yoke 2 so that the ball can roll when the ball springs out in the circumferential direction when the motor rotates at high speed. The lace 5 is formed and a race yoke 4 for fixing the race 5 is formed.

Referring to the operation of the disk drive motor according to the prior art made of the configuration as follows.

First, when the rotating shaft 8 including the rotor yoke 2 is rotated by the rotor force of the driving magnet 3 and the armature core 11, the upper end of the rotating shaft 8 is coupled by the bush 7. The turn-table 6 is also interlocked together to rotate the disk 9 seated by a clamp and a clamp magnet (not shown).

However, in the above operation, when the disk is seated on the turn-table 6 and rotates, vibration occurs due to the eccentricity of the disk or the mass eccentricity of the motor rotor. It affects the performance of SET) and causes READ error.

Therefore, it is necessary to eliminate the unbalance generated by such eccentricity dynamically during the rotation of the motor.

2 and 3 show the arrangement of the balls 9 at the time of stop and rotation of the conventional disc drive motor, respectively.

As shown in FIG. 2, when the motor is stopped, the ball 9 is attached to the magnet by the magnetic force of the magnet 10. However, when the motor rotates as shown in FIG. It moves to (5) plane. At this time, the positions of the balls 9 are moved in a direction to compensate for the weight balance (balance) by itself to be dynamically balanced (balancing).

As described above, in the conventional disc drive motor, there is a problem in that vibrations due to disc eccentricity are generated due to the ball being moved to only one place of the race surface by the centrifugal force when the motor rotates.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a disk drive motor that dynamically reduces vibration generated in a disk drive motor rotating at high speed.

1 is a cross-sectional view of main parts of a disc drive motor according to the prior art.

Figure 2 is a state diagram of the ball arrangement at the stop of the conventional disc drive motor

Figure 3 is a state diagram of the ball arrangement during rotation of the conventional disk drive motor

4 is a sectional view of main parts of a disc driving motor according to an embodiment of the present invention;

5 is a state diagram showing the position of the balance magnet at the stop of the disk drive motor of the present invention;

Figure 6 is a state diagram showing the balance magnet position during rotation of the disk drive motor of the present invention

7 is a sectional view of principal parts of a disc driving motor according to another embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

1 stator 2 rotor yoke

3: driving magnet 4: race yoke

5: race 6: turn-table

7: bush 8: rotating shaft

9: Ball 10: Magnet

11: armature core 12: bearing holder

13: bearing 14, 16: balance magnet

15: inner magnet 17: clamp

18: clamp magnet 19: disk

In order to achieve the above object, the disc drive electric motor of the present invention includes a rotary shaft supported by a bearing fitted to a bearing holder, a turn-table mounted on an upper end of the rotary shaft to support a disk, and on the turn-table. The disc drive motor including a bush inserted into the rotating shaft to fix the disk, a rotor yoke fixed by the bush to the rotating shaft at the bottom of the turn-table, and a driving magnet and an armature core installed inside the rotor yoke. In

A race yoke formed between the turn-table and the rotor yoke and fixed to an upper end of the yoke before rotation,

A magnet formed inside the turn-table and the lace yoke,

It is characterized in that it is provided on the outside so as to face the magnet formed between the turn-table and the race yoke and has a balance magnet having an inner diameter larger than the outer diameter of the magnet.

Here, the outer diameter of the magnet and the inner diameter of the balance magnet are magnetized to the same pole or different poles.

In order to achieve the above object, another disk drive electric motor of the present invention is a rotary shaft supported by a bearing fitted to a bearing holder, a turn-table mounted on an upper end of the rotary shaft to support a disk, and on the turn-table The disc drive motor including a bush inserted into the rotating shaft to fix the disk, a rotor yoke fixed by the bush to the rotating shaft at the bottom of the turn-table, and a driving magnet and an armature core installed inside the rotor yoke. In

A clamp for pressing and holding a disk seated on the turn-table;

A clamp magnet inserted inside the center of the clamp and magnetically coupled to the bush;

It is characterized in that it is provided on the outside to maintain a constant distance from the outer diameter of the clamp magnet face to face and has an inner diameter larger than the outer diameter of the clamp magnet.

The outer diameter of the clamp magnet and the inner diameter of the balance magnet are both magnetized to the same pole or different poles.

In order to achieve the above object, another disc drive electric motor of the present invention is a rotary shaft supported by a bearing fitted to a bearing holder, a turn-table mounted on an upper end of the rotary shaft to support a disk, and on the turn-table A disk inserted into a rotating shaft of the disk to fix the disk, a rotor yoke fixed by the bush to the rotating shaft of the turn-table bottom, a drive magnet and an armature core installed inside the rotor yoke To

A clamp for pressing and holding a disk seated on the turn-table;

A clamp magnet inserted inside the center of the clamp and magnetically coupled to the bush;

An inner magnet having an inner diameter larger than an outer diameter of the clamp magnet inside the clamp,

Maintaining a constant space with the outer diameter of the inner magnet, characterized in that it comprises a balance magnet having an inner diameter larger than the outer diameter of the clamp magnet to face the face.

The outer diameter of the inner magnet and the inner diameter of the balance magnet are both magnetized to the same pole or different poles.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in all the drawings for describing the embodiments having the same function uses the same reference numerals and repeated description thereof will be omitted.

4 is a cross-sectional view illustrating main parts of a disc driving motor according to an embodiment of the present invention, and FIG. 5 is a state diagram showing a balance magnet position when the disc driving motor of the present invention is stopped, and FIG. 6 is a disc drive of the present invention. It is a state figure which shows the balance magnet position at the time of rotation of a motor.

As shown in FIG. 4, the disc drive motor according to the present invention is provided with a rotating shaft 8 supported by a bearing 13 fitted to a bearing holder 12, and mounted on an upper end of the rotating shaft 8 to mount a disk. A turn-table 6 for supporting, a bush 7 inserted into the rotational shaft 8 on the turn-table 6 and fixing the disk, and a rotational shaft 8 below the turn-table 6; Rotor yoke 2 fixed by bush 7, drive magnet 3 and armature core 11 provided inside rotor yoke 2, turn-table 6 and rotor A race yoke 4 formed between the yoke 2 and fixed to an upper end of the yoke 2 before rotation, and a magnet 10 formed between the turn-table 6 and the race yoke 4. The outer alarm of the magnet 10 is installed on the outside so as to face the magnet 10 formed between the turn-table 6 and the race yoke 4. It consists of a balance magnet 14 with a large internal diameter.

Referring to the operation of the disk drive motor according to the present invention made of the above configuration as follows.

The outer diameter side of the magnet 10 is magnetized to the N pole, and the inner diameter side of the balance magnet 14 is magnetized to the N pole so that a repulsive force is generated between the inner magnet 10 and the balance magnet 14.

5 and 6 show that the outer diameter side of the inner magnet 10 and the inner diameter side of the balance magnet 11 are magnetized to the same pole.

As shown in FIG. 5, when the motor is stopped or rotates at low speed, or when there is no mass balance of the driving magnet 3, the inner magnet 10 and the balance magnet 14 face each other with the same pole (N pole). Because of the repulsive force is applied to maintain a constant balance, when the motor is rotated at a high speed when the unbalance occurs in the driving magnet, the balance magnet 14 is moved to the opposite side where the unbalance occurs as shown in Figure 6 automatically maintains the balance .

The disk drive motor of the present invention can achieve the same effect by forming the outer diameter side of the inner magnet 10 and the inner diameter side of the balance magnet 11 as opposite poles.

7 is a cross-sectional view of the main portion of the disc drive motor according to another embodiment of the present invention, which is mounted on a rotary shaft 8 supported by a bearing 13 fitted to a bearing holder 12 and an upper end of the rotary shaft 8. A turn-table 6 for supporting the disk 19, a bush 7 inserted into the rotational shaft 8 on the turn-table 6 to fix the disk, and a lower end of the turn-table 6; A rotor yoke 2 fixed to a rotating shaft 8 of the rotor by a bush, a drive magnet 3 and an armature core 11 provided inside the rotor yoke 2, and the turn-table 6 A clamp 17 for pressing and holding the disk 19 seated thereon, a clamp magnet 18 fitted inside the central portion of the clamp 17 and magnetically coupled to the bush, and the clamp 17 outside the clamp 17. The inner magnet 15 having an inner diameter larger than the outer diameter of the magnet 18, and the outer diameter of the inner magnet 15 Maintaining a prescribed space, and comprises a balance magnet (16) inner diameter is formed larger than the outer diameter of the clamping magnet (18) so that the facing surface.

In addition, both the outer diameter of the inner magnet and the inner diameter of the balance magnet are magnetized to the same pole or the opposite pole to automatically maintain the balance.

In addition, another disk drive motor of the present invention, although not shown in the drawings, a rotating shaft supported by a bearing fitted to a bearing holder, a turn-table mounted on an upper end of the rotating shaft to support a disk, and the turn- A disk drive including a bush inserted into a rotating shaft on a table to fix a disk, a rotor yoke fixed by a bush to a rotating shaft below the turn-table, and a driving magnet and an armature core installed inside the rotor yoke. An electric motor comprising: a clamp for pressing and holding a disk seated on the turn-table, a clamp magnet fitted inside the center of the clamp and magnetically coupled to the bush, and maintaining a constant space with an outer diameter of the clamp magnet and facing each other. It is installed on the outside so that the inner diameter is larger than the outer diameter of the clamp magnet balun One embodiment of the present invention provided with a magnet can implement the same effects as those of the example. Similarly, the outer diameter of the clamp magnet and the inner diameter of the balance magnet are both magnetized to the same pole or the opposite pole, so that the balance can be automatically maintained at high speed.

As described above, according to the disc drive motor according to the present invention, an inner magnet is provided above the rotor yoke, and a balance magnet having a larger inner diameter than the outer diameter of the inner magnet is installed to face the outer diameter of the inner magnet. By magnetizing the outer diameter side of the inner magnet and the inner diameter side of the balance magnet to the same pole or the opposite pole, the balance magnet is moved to the opposite side where the unbalance occurs when the motor rotates at a high speed, thereby having a very excellent effect. .

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims. something to do.

Claims (9)

A rotating shaft supported by a bearing fitted to a bearing holder, a turn-table mounted on an upper end of the rotating shaft to support a disk, a bush inserted into the rotating shaft on the turn-table to fix the disk, and a lower end of the turn-table In a disk drive electric motor comprising a rotor yoke fixed by a bush to a rotating shaft of the rotor, and a drive magnet and an armature core provided inside the rotor yoke, A race yoke formed between the turn-table and the rotor yoke and fixed to an upper end of the yoke before rotation, A magnet formed inside the turn-table and the lace yoke, And a balance magnet installed on the outside so as to face the magnet formed between the turn-table and the race yoke and having a larger inner diameter than the outer diameter of the magnet. The method of claim 1, And an outer diameter of the magnet and an inner diameter of the balance magnet are magnetized to the same pole. The method of claim 1, An outer diameter of the magnet and an inner diameter of the balance magnet are magnetized to different poles. A rotating shaft supported by a bearing fitted to a bearing holder, a turn-table mounted to an upper end of the rotating shaft to support a disk, a bush inserted into the rotating shaft on the turn-table to fix the disk, and a lower end of the turn-table In a disk drive electric motor comprising a rotor yoke fixed by a bush to a rotating shaft of the rotor, and a drive magnet and an armature core provided inside the rotor yoke, A clamp for pressing and holding a disk seated on the turn-table; A clamp magnet inserted inside the center of the clamp and magnetically coupled to the bush; And a balance magnet which is installed on the outside so as to face a surface while maintaining a constant space with the outer diameter of the clamp magnet, the balance magnet having an inner diameter larger than the outer diameter of the clamp magnet. The method of claim 4, wherein And an outer diameter of the clamp magnet and an inner diameter of the balance magnet are magnetized to the same pole. The method of claim 4, wherein And an outer diameter of the clamp magnet and an inner diameter of the balance magnet are magnetized to different poles. A rotating shaft supported by a bearing fitted to a bearing holder, a turn-table mounted on an upper end of the rotating shaft to support a disk, a bush inserted into the rotating shaft on the turn-table to fix the disk, and a lower end of the turn-table In a disk drive electric motor comprising a rotor yoke fixed by a bush to a rotating shaft of the rotor, and a drive magnet and an armature core provided inside the rotor yoke, A clamp for pressing and holding a disk seated on the turn-table; A clamp magnet inserted inside the center of the clamp and magnetically coupled to the bush; An inner magnet having an inner diameter larger than an outer diameter of the clamp magnet inside the clamp, And a balance magnet having an inner diameter larger than the outer diameter of the clamp magnet so as to face a surface while maintaining a constant space with the outer diameter of the inner magnet. The method of claim 7, wherein And an outer diameter of the inner magnet and an inner diameter of the balance magnet are magnetized to the same pole. The method of claim 7, wherein An outer diameter of the inner magnet and an inner diameter of the balance magnet are magnetized to different poles.

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