KR20130015439A

KR20130015439A - Sindle motor

Info

Publication number: KR20130015439A
Application number: KR1020110077432A
Authority: KR
Inventors: 지중근
Original assignee: 삼성전기주식회사
Priority date: 2011-08-03
Filing date: 2011-08-03
Publication date: 2013-02-14

Abstract

Spindle motor according to the present invention is a shaft that forms the center of rotation of the rotor, a sleeve for receiving the shaft, rotatably supporting the shaft, the shaft is integrally coupled to the central portion and the upper end of the shaft to correspond to one end surface of the sleeve The hub coupled to one side is formed with a flange surface, one side is coupled to the outer circumferential surface of the sleeve, the other side is coupled to the base and the one end in the upper direction of the base coil wound coil wound on the other side It includes a lamp formed on the flange surface of the. In addition, by forming the air bearing in the tapered shape of the even number of lamps, there is an effect that the operation reliability and performance of the spindle motor due to the balance of the operation of the rotor is improved.

Description

Spindle Motor

The present invention relates to a spindle motor.

In general, a spindle motor belongs to a brushless DC motor (BLDC). In addition to a motor for a hard disk drive, a spindle motor includes a laser beam scanner motor for a laser printer, a motor for a floppy disk drive (FDD) And a motor for an optical disk drive such as a DVD (Digital Versatile Disk).

In devices requiring high capacity and high speed, such as hard disk drives, in order to minimize the occurrence of noise and non-repetitive run out (NRRO), which is a vibration generated when ball bearings are employed, fluids with less driving friction than conventional ball bearings Spindle motors with dynamic bearings are widely used. Hydrodynamic bearings basically form a thin oil film between the rotating body and the fixed body to support the rotating body and the fixed body with the pressure generated during rotation, so that the friction load is reduced because the rotating body and the fixed body do not contact each other. Therefore, in the spindle motor to which the fluid dynamic bearing is applied, the shaft of the motor for rotating the disk is maintained by the lubricating oil (hereinafter referred to as 'working fluid') only by the dynamic pressure (pressure returned to the oil pressure center by the centrifugal force of the rotating shaft). It is distinguished from a ball bearing spindle motor supported by a shaft ball steel ball.

Noise reduction technology is widely used, such as the spindle motor using the hydrodynamic bearing as described above. Also, as the HDD spindle motor is applied to a wide range of products such as netbooks, mobile phones, game machines, MP3, Research into miniaturization and low current has been actively conducted. In particular, it is applied to a large number of portable products, there are various problems, such as a decrease in the operation reliability and product performance due to the vibration or noise of the spindle motor according to the miniaturization and thinning.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a tapered lamp in the rotational direction of the spindle motor to alleviate the operating noise by reducing vibration characteristics, thereby reducing the operational reliability of the spindle motor It is to provide a spindle motor for improving performance.

Spindle motor according to the present invention is a shaft that forms the center of rotation of the rotor, a sleeve for receiving the shaft, rotatably supporting the shaft, the shaft is integrally coupled to the central portion and the upper end of the shaft to correspond to one end surface of the sleeve The hub coupled to one side is formed with a flange surface, one side is coupled to the outer circumferential surface of the sleeve, the other side is coupled to the base and the one end in the upper direction of the base coil wound coil wound on the other side It includes a lamp formed on the flange surface of the.

Here, the ramp is characterized in that the tapered so that the forming height in the vertical direction from the flange surface in the direction in which the rotor rotates gradually lower.

In addition, the lamp is characterized in that the even number is formed along the flange surface of the hub, the position is symmetrical to each other.

In addition, the lamp is characterized in that formed integrally on the flange surface of the hub.

In addition, one surface of the base facing the flange surface of the hub is formed to be spaced apart in parallel to each other.

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, by forming an air bearing portion between the flange surface of the hub of the spindle motor and the base surface facing the spindle motor in the rotational direction of the spindle motor, there is an effect of reducing the noise and vibration characteristics generated during operation of the spindle motor.

In addition, by forming an even number of ramps on the flange surface of the hub facing the one end surface in the upper direction of the base of the spindle motor, there is an effect of maintaining the rotational balance during the rotational drive of the spindle motor.

In addition, by forming an even number of lamps tapered in a direction coinciding with the rotational direction, an air bearing part is formed between one end surface of the base facing the lamp formed on the flange surface of the hub, so that the rotation of the rotor is driven. The balance has the effect of improving the operating reliability and performance of the spindle motor.

In addition, by forming an even number of ramps on the flange surface of the hub facing the one end surface of the upper direction of the base, the hub of the spindle motor is fixed to the base by the lift force generated by the ramp when the rotor rotates. There is an effect of maintaining the rotational balance of the entire spindle motor by rotating in the gap.

1 is a cross-sectional view of a spindle motor according to the present invention;
2 is a cross-sectional view of AA of FIG. 1; And
3 is a perspective view of a lamp according to the 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. Also, the terms "one side,"" first, ""first,"" second, "and the like are used to distinguish one element from another, no. In addition, "upper" and "lower" of the present invention shall mean the upper and lower parts based on the axial direction. 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 cross-sectional view of the spindle motor according to the present invention, FIG. 2 is a cross-sectional view of the lamp during operation of the spindle motor according to the present invention as a cross-sectional view of FIG. Is a perspective view of the lamp according.

The spindle motor according to the present invention includes a shaft 11 constituting the rotation center of the rotor 10, a sleeve 22 accommodating and supporting the shaft 11 and rotatably supporting the shaft 11, and the shaft 11 is integrally formed at the center thereof. Coupled to the one end of the shaft (22) to correspond to one end surface of the sleeve 22, the flange 12 (12a) formed on one side end, one side is coupled to the outer peripheral surface of the sleeve 22 And formed on the flange surface 12a of the hub 12 facing and spaced apart from one end surface in the upper direction of the base 21 to which the core 23 wound around the winding coil is wound on the other side of the base 21. And a lamp 30 to be used.

As shown in FIG. 1, the shaft 11 forms a central axis in which the spindle motor rotates, and generally has a cylindrical shape. A thrust plate 50 for forming a thrust bearing by a hydrodynamic bearing is inserted so as to be orthogonal to the upper portion of the shaft 11. Here, although the thrust plate 50 is formed to be formed on the upper side of the shaft 11, it can be inserted into the lower end of the shaft 11 orthogonally installed. The thrust plate 50 may be separate laser welding or the like for fixing to the shaft 11, but it is apparent to those skilled in the art that the thrust plate 50 may be press-fitted by applying a predetermined pressure to the thrust plate 50. In order to form a thrust copper bearing by a hydrodynamic bearing, a thrust plate 50 may be provided with a dynamic pressure generating groove (not shown).

The sleeve 22 is configured to rotatably support the shaft 11 and has a hollow cylindrical shape as a whole. The sleeve 22 has an outer surface of the coupled shaft 11 and a bearing surface facing the thrust plate 50 to the hydrodynamic bearing. The thrust dynamic pressure bearing part is formed. A thrust dynamic pressure part for forming a thrust dynamic pressure bearing part may be provided with a thrust dynamic pressure generating groove (not shown) in the thrust plate 50 or the shaft 11 forming a bearing surface. Between the outer circumferential surface of the sleeve 22 and the shaft 11 facing each other, a radial hydrodynamic bearing part by a hydrodynamic bearing is formed. A radial dynamic pressure generating groove (not shown) is formed on an outer circumferential surface of the sleeve 22 facing the shaft 11 so as to form a radial hydrodynamic bearing part, and a working fluid (between the outer circumferential surface of the sleeve 22 and the shaft 11) is formed. Oils may be used, for example). The radial dynamic pressure generating groove maintains a non-contact state between the shaft 11 and the sleeve 22 by generating fluid dynamic pressure using a fluid stored between the sleeve 22 and the shaft 11 when the shaft 11 rotates. . The radial dynamic pressure generating groove may be formed on the outer circumferential surface of the shaft 11 forming the radial dynamic pressure bearing portion by the fluid dynamic bearing.

The hub 12 is coupled at the top of the shaft 11 so that the shaft 11 is integrally coupled to the central portion and corresponds to one end surface of the sleeve 22. The lamp 30 is located on the flange surface 12a formed at one end of the hub 12. Here, the flange face 12a of the hub 12 is formed to face one end face formed in the upper direction of the base 21, and the gap between the flange face 12a and one face of the base 21 that faces the face 21 is constant. It is characterized by being formed. In addition, the magnet 12 is attached to the hub 12 so as to correspond to the core 23 wound around the winding coil while being coupled to the shaft 11 upper portion.

The base 21 is coupled to the outer circumferential surface of the sleeve 22 so that the sleeve 22 including the shaft 11 is coupled to the inside. On the other side opposite to one side of the base 21, the core 23 wound around the winding coil is coupled to a position corresponding to the magnet 13 formed on the hub 12. The base 21 serves to support the overall structure at the bottom of the spindle motor, and the manufacturing method may be manufactured by a press working or die-casting method. The material by press working may be a metal of various materials such as aluminum and steel, but is preferably formed to have rigidity. The flange surface 12a of the hub 12 is formed so as to face at one end in the upper direction of the base 21 with a predetermined gap. Between the tapered lamp 30 formed on the flange face 12a and one end face of the base 21 facing each other, the air bearing part (Air) is formed by the airflow formed in the direction opposite to the rotation direction when the spindle motor is operated. Bearing 40 is formed. A detailed description of the air bearing unit 40 will be described later.

The lamp 30 is disposed between the one end surface formed in the upper direction of the base 21 and the flange surface 12a of the hub 12 facing a predetermined gap, and is formed on the flange surface 12a of the hub 12. do. When the rotation of the rotor 10 of the spindle motor including the hub 12 is characterized in that it has a tapered shape in the rotational direction. That is, as shown in Figure 2, the hub 12 is tapered so that the forming height in the vertical direction from the flange surface 12a of the lamp 30 provided on the flange surface 12a toward the a direction in which the rotation 12 is gradually lowered. It is done. The tapered shape of the lamp 30 can produce the effect of forming the air bearing portion 40 during the operation of the motor, thereby reducing the vibration during operation, thereby reducing the operating noise.

Specifically, as shown in Figure 2, the spindle motor is operated to rotate in the a direction. When the spindle motor rotates in the a direction, a gap difference between one end face of the base 21 facing by the tapered ramp 30 formed on the flange face 12a of the hub 12 occurs. That is, the portion where the gap between the tapered surface of the lamp 30 and the one end surface of the base 21 is relatively large due to the tapered shape forms a relatively slow air flow to form a small pressure, and a portion where the gap is relatively small. The rapid flow of air creates a relatively large pressure. Therefore, the air bearing portion 40 is formed in which the effect of the air bearing in the large pressure portion by the relative pressure difference, the lift force (lift force) is generated by this pressure difference. Since the lamp 30 is formed in an even number of symmetrical structures, the lifting force is generally balanced so that the rotor 10 and the stator 20 at the time of rotation driving may achieve an overall balance. That is, the gap formed between the flange surface 12a of the hub 12 and the one end surface of the base 21 facing the flange 12 by the air bearing portion 40 generated at the high speed rotation can be kept constant. In addition, the lamp 30 is formed to be evenly symmetrical to the flange 12a of the hub 12, so that it is possible to properly maintain the balance of the overall force, thereby reducing the noise and vibration characteristics generated during the rotational drive of the spindle motor Can be.

As shown in Figure 3, the lamp 30 according to the present invention is formed in an even number, the hub 12 is formed so as to symmetrically correspond to the flange surface 12a, respectively, the lamp 30 is tapered in the rotation direction Is formed. The arrangement shape of the lamp 30 shown in FIG. 3 illustrates an embodiment, and the number of the lamps 30 is not limited thereto, and various embodiments may be possible with an even number of symmetrical arrangements. That is, it is obvious to those skilled in the art that the number can be appropriately selected according to the rotation characteristics such as 2, 4, 6, ..2n, and the degree of tapering can be appropriately changed in design.

The configuration and operation relationship of the spindle motor according to an embodiment of the present invention will be described briefly with reference to FIG. 1 as follows.

The rotor 10 is composed of a shaft 11 and a hub 12 to which a magnet 13 is attached, which is a rotating shaft and is rotatable. The stator 20 includes a base 21, a sleeve 22, and a core ( 23 and the pulling plate 24 may be included. The core 23 and the magnet 13 are attached to the outer side of the base 21 and the inner side of the hub 12, respectively, where the core 23 generates a magnetic field as a magnetic field is formed when current flows. . The magnet 13 facing the magnet is repeatedly magnetized with the N pole and the S pole to form an electrode corresponding to the variable electrode generated in the core 23. The core 23 and the magnet 13 are generated by the repulsive force by the electromagnetic force due to the linkage of the magnetic flux, thereby driving the spindle motor of the present invention by rotating the hub 12 and the shaft 11 coupled thereto. In addition, a pulling plate 24 is formed on the base 21 so as to correspond to the magnet 13 in the axial direction in order to prevent the floating of the motor. The pulling plate 24 allows a stable rotational drive by allowing the magnet 13 and the attraction force to act. In particular, the present invention further includes a lamp 30 on the flange face 12a of the hub 12, thereby reducing vibration characteristics and noise, thereby enabling a more stable rotational drive.

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 scope of the invention as defined by the appended claims. It will be apparent that modifications and improvements can be made by those skilled in the art.

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.

10: rotor 11: shaft
12: hub 12a: flange face
13: magnet 20: stator
21: base 22: sleeve
30: lamp 40: air bearing portion
50: thrust plate a: direction of rotation
b: airflow direction

Claims

A shaft forming a rotation center of the rotor;
A sleeve for receiving the shaft and supporting the shaft rotatably;
A hub integrally coupled to the shaft and coupled at an upper portion of the shaft to correspond to one end surface of the sleeve and having a flange surface formed at one end thereof;
One side is coupled to the outer circumferential surface of the sleeve, the other side is the base coil is wound winding coil coupled; And
A lamp formed on a flange surface of the hub facing away from one end surface in an upper direction of the base;
Spindle motor comprising a.

The method according to claim 1,
The ramp motor is characterized in that the spindle motor is tapered so that the forming height in the vertical direction from the flange surface gradually decreases in the direction in which the rotor rotates.

The method according to claim 1,
The ramp motor is an even number is formed along the flange surface of the hub, the spindle motor, characterized in that formed in a symmetrical position.

The method according to claim 1,
And the ramp is integrally formed on the flange face of the hub.

The method according to claim 1,
Spindle motor, characterized in that the one end surface of the base facing the flange surface of the hub are spaced apart in parallel to each other.