KR20130113133A - Spindle motor - Google Patents

Abstract

The present invention relates to a spindle motor. In the spindle motor according to the present invention, by using a bearing as a rotating shaft, the shaft system can be formed longer than in the prior art, thereby preventing occurrence of wobble and skew due to unstable rotation of the rotor. There is an effect of extending life and improving reliability through stable rotation. In addition, the thrust structure and the anti-rotation structure are formed on the upper part in accordance with this change, thereby preventing the shaft system from being shortened.

Description

Spindle Motors {SPINDLE MOTOR}

The present invention relates to a spindle motor.

The spindle motor can easily maintain the rotational characteristics as the shaft rotates while maintaining a constant contact area with the bearings, and thus requires a high speed rotation such as a hard disk drive (HDD) and an optical disk drive (ODD). Is widely used as a driving means of a recording medium.

Such spindle motors typically include an armature, a main magnet that generates electromagnetic forces between the armature, a rotor including a shaft, and a stator rotatably supporting the rotor through bearings.

In addition, the rotor may include a disk chucking device to fix the disk of the recording medium, the rotor is rotated by the electromagnetic force generated between the armature and the main magnet disk of the recording medium mounted on the disk fixing device To record and play back.

Meanwhile, as described above, the spindle motor forms an axis system through contact between the shaft and the bearing, and the longer the axis system is, the higher the stability of rotation can be and the stability is also secured in terms of characteristics with an external set. On the other hand, as the shaft system becomes shorter, a wobble phenomenon and a skew occur, which causes a defect.

The reason for the shortening of the shaft system is that the shaft is typically used as the rotating shaft, and the stopper structure is formed in the lower portion of the shaft in order to prevent injury of the rotor.

This is disclosed in detail in (Patent Document 1), that is, a rotor (Rotor) is installed on the upper portion of the shaft and uses it as a rotating shaft. And by forming a ring-shaped reduction portion formed in the lower end of the shaft, by installing a stopper in the inner lower portion of the holder that accommodates the bearing in contact with the shaft therein so that the reduction portion is caught by the stopper, Preventing rotor injuries.

Therefore, in the conventional spindle motor including the (Patent Document 1), the length of the shaft system in which the shaft is formed in contact with the bearing is inevitably shortened by the rotor and the anti-floating structure, thereby causing the shaking and tilting of the rotor. Phenomenon occurs.

In addition, a single layer, that is, a thrust is formed in the lower part of the shaft, which is formed in order to improve rotational characteristics of the shaft of the conventional spindle motor including the patent document 1, which also shortens the length of the shaft system. It acts as a factor.

KR 2011-0010231 A

Therefore, in the present invention, the shaft system of the spindle motor is shortened by a stopper structure for preventing the injuries of the rotor, and the reduction of the rotational characteristics such as the shaking phenomenon occurs due to the shortening of the shaft system, thereby improving the problem of causing the defect. It is for.

An aspect of the present invention is to provide a spindle motor which can easily extend the length of the shaft system to prevent deterioration of rotational characteristics.

In order to achieve the above point of view,

Spindle motor according to the present invention includes a stator including a shaft;

An armature comprising a core provided in the stator; And

A rotor including a bearing rotatably provided on the shaft, a rotor case installed on an upper portion of the bearing, and a main magnet provided on the rotor case so as to face the core;

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In the spindle motor according to the present invention, the rotor case is a disk portion disposed on the upper portion of the armature, the opening portion formed in the center of the disk portion, the fixed portion and the horizontal portion refracted in the lower direction from the opening fixed to the upper portion of the bearing And characterized in that it comprises a coupling portion refracted in the downward direction on the outer diameter of the disc portion.

In the spindle motor according to the present invention, a cover portion covering the axial upper side of the rotor case is disposed at the upper end of the shaft.

In the spindle motor according to the present invention, a thrust washer is provided between the cover part and the shaft.

In the spindle motor according to the present invention, the shaft is provided with a groove portion at the upper portion, a stopper is provided in the rotor case is characterized in that one end of the stopper is inserted into the groove portion.

In the spindle motor according to the present invention, the core is provided with a suction magnet facing the rotor case.

In the spindle motor according to the present invention, the upper portion of the rotor case is characterized in that the disk chucking device is provided.

According to the present invention, unlike the prior art, by using the bearing as a rotating shaft, the shaft system formed by contacting the bearing and the shaft has an effect of lengthening, through which the shaking (Wobble) phenomenon due to unstable rotation of the rotor, etc. It is possible to prevent the occurrence of the stable rotation characteristics can be maintained to extend the life.

In addition, the rotor is installed on the upper portion of the bearing through the horizontal portion and the fixed portion refracted in the rotor case downward, it is easy to thin the overall height of the spindle motor.

In addition, the cover part is provided at the upper end of the shaft to cover the upper side in the axial direction of the rotor case, so that external foreign matters and the like can easily be prevented, and when the thrust washer is provided between the cover part and the shaft, The stable rotation of the electrons is possible, thereby improving reliability through securing improved quality.

On the other hand, the floating structure of the rotor is formed on the top of the shaft, it is possible to easily prevent the injury of the rotor without shortening the length of the shaft system. And it is more easy to prevent injury if the suction magnet includes a suction magnet.

1 is a cross-sectional view of a spindle motor according to an embodiment of the present invention.
Figure 2 is a cross-sectional view showing a floating structure of the spindle motor according to an embodiment of the present invention.
Figure 3 is a sectional view showing that the disk chucking device is installed in the spindle motor according to an embodiment of the present invention.

Specific aspects and specific technical features of the present invention will become more apparent from the following detailed description and embodiments associated with the accompanying drawings. Meanwhile, in describing the present invention, detailed descriptions of related well-known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

1, the spindle motor 1 according to the present invention includes a stator including a shaft, an armature including a core provided in the stator 10, and the shaft. Bearing (11) rotatably provided in the (11), a rotor case (Rotor case) provided on the upper portion of the bearing 31 and the main magnet provided in the rotor case 32 to face the core 21 ( Rotor including a Main Magnet).

The stator 10 is for supporting the armature 20 and the rotor 30, and typically includes a base plate 12 and a holder 13 provided on the base plate 12, the base plate ( 12, the shaft 11 is installed in the axial direction.

The armature 20 is provided with a core 21 in the holder 13, the coil 22 is wound around the core 21 to generate an electromagnetic force between the main magnet 33, the rotor 30 ) Is rotated, the circuit board 12a is provided on the base plate 12 for power supply at this time.

The rotor 30 is rotated by the electromagnetic force generated between the core 21, and is usually provided in the rotor case 32 and the rotor case 32, the main magnet 33 is disposed opposite to the core 21 ). At this time, the rotor case 32 is installed on the top of the bearing 31 rotatably provided in the stator 10 while maintaining a constant contact section on the shaft (11).

That is, the spindle motor 1 according to the present invention does not use the shaft 11 as a rotating shaft, unlike the prior art, and installs the rotor case 32 in the bearing 31 to use it as the rotating shaft. ) And the shaft (H) is formed in contact with the length of the shaft (H) is long to improve the rotation characteristics of the rotor (30).

Here, as described above, the shaft system H refers to a portion where the bearing 31 and the shaft 11 contact each other, and as the shaft system H is longer, rotational safety of the rotor 30 may be improved. While the stability is secured in terms of characteristics with the external set, the shorter the shaft system, the more the wobble and skew of the rotor 30 occur, which causes a defect.

Therefore, the spindle motor 1 according to the present invention uses the bearing 31 as a rotating shaft to ensure the maximum length of the shaft system (H). In addition, by arranging the cover part 34 at the upper end of the shaft 11 in accordance with the change of the rotational shaft so as to cover the upper side of the rotor case 32 in the axial direction, foreign matter or the like penetrates into the spindle motor 1. To prevent contamination.

Meanwhile, the spindle motor 1 according to the present invention further includes a thrust washer 35 to maintain stable rotational characteristics of the rotor 30 through contact with the upper end of the shaft 11, and furthermore, the rotor ( In order to prevent the injury of the 30) to form an injury prevention structure on the upper portion of the shaft (11).

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

As shown in FIG. 1, the stator 10 forms a press-fit part 12b on a base plate 12 provided with a circuit board 12a so that the shaft 11 is orthogonally installed in the press-fit part 12b. Done. And the holder 13 is installed on the base plate 12 around the shaft 11.

The armature 20, which receives external power through the circuit board 12a, is provided with a core 21 at a locking portion 13a formed in a step shape on the outside of the holder 13, and the core 31 The coil 22 is wound around a pole of the pole to generate an electromagnetic force between the main magnet 33 and the main magnet 33.

The rotor 30 forms a shaft system H by inserting a bearing 31 into the holder 13 so that the shaft 11 is located at the center thereof, and spaces the holder 13 from the bearing 31. By interposing oil or the like between them, easy rotation is achieved, and a rotor case is installed on the bearing 31 and then facing the core 31 inside the rotor case 32. The main magnet 33 is to be provided.

Herein, the rotor case 32 will be described in more detail. The rotor case 32 is disposed above the armature 20 to form an opening 32b in the center of the disc portion 32a on which the disk is mounted. In the opening part 32b, the fixing part 32c and the horizontal part 32d are refracted in the downward direction, and the fixing part 32c and the horizontal part 32d are fixed to the upper part of the bearing 31 to be installed. In addition, the coupling portion 32e is bent to the outer diameter of the disc portion 32b in a downward direction to provide the main magnet 33 inside the coupling portion 32e.

Accordingly, the rotor case 32 has the main magnet 33 and the core 21 provided inside the coupling part 32e using the bearing 31 forming the shaft system H between the shaft 11 as the rotation axis. It is rotated by the electromagnetic force generated between and.

As shown in FIG. 2, the cover part 34 is provided in the vertical part 32f formed in the upper direction in the opening part 32b formed in the center of the rotor case 32. Accordingly, the cover part 34 is disposed on the upper end of the shaft 11 to seal the inside of the spindle motor 1 which is opened to the outside by the opening 32b. In addition, a thrust washer 35 is provided inside the cover part 34 to contact the upper end of the shaft 11.

In addition, a stopper is provided on the vertical part 32f, and a groove part 11a is formed on the shaft 11 corresponding to the vertical part 32f, thereby forming a floating prevention structure of the rotor 30.

That is, the stopper 36 prevents the injuries of the rotor 30 through interference with the shaft 11, and the stopper 36 is formed in the groove 11a formed in the shaft 11. One end is inserted. Accordingly, when the rotor 30 is injured, the groove 11a is caught and stopped by the stopper while the shaft 11 is injured, thereby preventing injury.

In addition, as the anti-floating structure of the rotor 30, the suction magnet 37 is installed on the upper portion of the core 21 facing the rotor case 32 to prevent the rotor 30 from rising.

Meanwhile, in the spindle motor 1 according to the present invention, as shown in FIG. 3, a disk chucking device 40 is installed on the rotor case 32. That is, the disk chucking device 40 is installed in the upper axial direction of the rotor case 32, the claw member 41 is free to move in the radial direction to hold the disk in the disk chucking device 40 ) Is provided.

Therefore, the spindle motor 1 including the disk chucking device 40 supplies external power to the armature 20 through the circuit board 12a, thereby preventing the electromagnetic force generated between the main magnet 33 and the core 31. As a result, the rotor 30 rotates the bearing 31 as the rotary shaft, thereby recording and reproducing the disc of the recording medium mounted on the disc chucking device 40 via the claw member 41.

Although the present invention has been described in detail through specific embodiments, this is for explaining the present invention in detail, and the spindle motor according to the present invention is not limited thereto, and a general knowledge of the art within the technical spirit of the present invention is provided. It is obvious that modifications and improvements are possible by those who have them.

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.

1-spindle motor 10-stator
11-shaft 11a-groove
12-Base Plate 12a-Circuit Board
12b-Indent 13-Holder
13a-latch 20-armature
21-core 22-coil
30-rotor 31-bearing
32-rotor case 32a-disc part
32b-opening 32c-fixing
32d-horizontal 32e-mating
32f-Vertical 33-Main Magnet
34-Cover 35-Thrust Washers
36-Stopper 37-Suction Magnet
40-Disc Chucking Device 41-Claw Member
H-shaft

Claims (7)

A stator including a shaft;
An armature comprising a core provided in the stator; And
A rotor including a bearing rotatably provided on the shaft, a rotor case installed on an upper portion of the bearing, and a main magnet provided on the rotor case so as to face the core;
Spindle motor comprising a.
The method according to claim 1,
The rotor case includes a disc portion disposed on the upper portion of the armature, an opening formed in the center portion of the disc portion, a fixed portion and a horizontal portion refracted in a downward direction from the opening portion fixed to the upper portion of the bearing, and downward in an outer diameter of the disc portion. Articulated joints;
Spindle motor comprising a.
The method according to claim 2,
Spindle motor, characterized in that the cover portion is disposed on the upper end of the shaft in the axial direction of the rotor case.
The method according to claim 3,
Spindle motor, characterized in that the thrust washer is provided between the cover portion and the shaft.
The method according to any one of claims 1 to 4,
The shaft is a spindle motor, characterized in that the groove is formed in the upper portion, the stopper (Stopper) is provided in the rotor case is inserted into one of the groove portion.
The method according to claim 5,
Spindle motor, characterized in that the core is provided with a suction magnet facing the rotor case.
The method according to claim 2,
Spindle motor, characterized in that the upper portion of the rotor case is provided with a disk chucking device.

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