KR20100135015A

KR20100135015A - Motor

Info

Publication number: KR20100135015A
Application number: KR1020090053436A
Authority: KR
Inventors: 강상선
Original assignee: 삼성전기주식회사
Priority date: 2009-06-16
Filing date: 2009-06-16
Publication date: 2010-12-24

Abstract

The motor is started. Rotor to which the magnet is coupled, shaft coupled to the rotor, sleeve for rotatably supporting the shaft, stator facing the magnet, base on which the outer circumferential surface is pressed against a part of the inner circumferential surface of the stator, and the remaining part of the inner circumferential surface of the stator The motor including the adhesive interposed between the outer circumferential surface and the support part can improve the stator fixing structure, reduce the micro vibration of the motor, and further improve the RRO of the hard disk drive.

Description

Motor {Motor}

The present invention relates to a motor.

A hard disk drive (HDD) is a storage device that consists of electronic devices and mechanical devices, which converts digital electronic pulses into more permanent magnetic fields to record and read data. It is widely used as an auxiliary storage device of a computer system because it can access at a high speed.

Recently, with the development of head technology, the storage density of hard disk drive is rapidly increasing. Therefore, it is more important to keep track mis-registration (TMR) performance at an appropriate level while ensuring the stability of the writing and reading function of the head. It became important.

Factors affecting TMR performance include repeatable run out (RRO) and non repeatable run out (NRRO). Among these, RRO is mainly caused by eccentricity of tracks to the center of the disc, deformation of the disc, or slight vibration at a specific driving frequency of the spindle motor, which is a disc drive. RRO acts as a disturbance in servo control, causing a reduction in the servo control performance of the head.

The present invention provides a disk drive motor capable of reducing RRO.

According to an aspect of the present invention, a rotor to which a magnet is coupled, a shaft coupled to the rotor, a sleeve rotatably supporting the shaft, a stator facing the magnet, and a base on which a support portion is formed in which an outer circumferential surface is pressed into a part of the inner circumferential surface of the stator. And an adhesive interposed between the remaining portion of the inner circumferential surface of the stator and the outer circumferential surface of the support portion.

Here, a step may be formed on the outer circumferential surface of the support to fill the adhesive.

According to the embodiment of the present invention, by improving the fixing structure of the stator, it is possible to reduce the fine vibration of the motor, and further improve the RRO of the hard disk drive.

The features and advantages of the present invention will become apparent from the following drawings and detailed description of the invention.

Hereinafter, embodiments of the motor according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and duplicate description thereof It will be omitted.

1 is a cross-sectional view showing a motor 100 according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a part of the motor 100 according to an embodiment of the present invention. As shown in Figure 1 and 2, the motor 100 according to an embodiment of the present invention, by improving the fixing structure of the stator 140, can reduce the micro-vibration of the motor 100, further It can improve the RRO of hard disk drive.

The motor 100 of the present embodiment may be, for example, a brushless DC electric motor using a drive unit for a hard disk drive.

The rotor 130 has a cylindrical shape with an open lower side, and covers the stator 140 of the motor 100 as a whole. The shaft 120 is coupled to the center thereof, and the magnet 132 is coupled to the inner circumferential surface thereof.

One end of the shaft 120 is coupled to the center of the rotor 130, the other end is rotatably supported by the sleeve 150. The flange portion 122 is formed on the outer circumferential surface of the upper side of the shaft 120. The flange portion 122 covers the upper side of the sleeve 150.

The sleeve 150 has a cylindrical shape as a whole, and accommodates the shaft 120 therein to rotatably support the shaft 120. The sleeve 150 may be, for example, a hydrodynamic bearing, and may include a cap 152 that covers the edge of the flange portion 122 on the upper side of the sleeve 150. Lubricant is interposed between the shaft 120, the sleeve 150, the flange portion 122, and the cap 152 to smoothly rotate the shaft 120.

The stator 140 includes an annular core and a coil 142 wound around the teeth and teeth extending at regular intervals outward of the core. The core of the stator 140 is inserted into the support part 160 of the base 110, which will be described later, and is supported by the base 110.

The base 110 provides a space in which the components forming the motor 100 can be accommodated and support the components. An annular support portion 160 is formed in the center of the motor 100. The support 160 has a cylindrical shape formed in the center of the base 110.

The sleeve 150 is inserted and supported in the hollow part formed at the center of the support part 160. That is, the inner circumferential surface of the support unit 160 supports the outer circumferential surface of the sleeve 150. The outer circumferential surface of the support unit 160 supports the inner circumferential surface of the core of the stator 140.

The support part 160 may include a press-fit part 162 and a bonding part 164 having different outer diameters from each other. The press-fit part 162 is press-fitted under the inner circumferential surface of the core of the stator 140 to support the stator 140. The adhesive 170 is filled between the bonding portion 164 and the upper side of the inner circumferential surface of the core of the stator 140.

The adhesive 170 may fix the stator 140 to the base 110, and may serve as a kind of dust absorbing material because the material has a lower rigidity than the stator 140 and the base 110. Thus, the adhesive 170 may prevent the vibration generated in the stator 140 from being transmitted to the base 110.

At this time, of course, the adhesive 170 may be partially interposed between the press-fit portion 162 and the core.

The outer diameter of the bonding portion 164 is smaller than the outer diameter of the press-fit portion 162 so that the adhesive 170 is interposed between the core and the core. Therefore, a step 166 is formed on the outer circumferential surface of the support part 160 by the press-fit part 162 and the bonding part 164.

There may be a gap between the indentation portion 162 and the bonding portion 164 and the core of the stator 140. For example, between the outer circumferential surface of the indentation portion 162 and the inner circumferential surface of the core of the stator 140. It may have a gap of 60 micrometers or less, and may have a gap of 60 micrometers or more between the outer circumferential surface of the bonding portion 164 and the inner circumferential surface of the core of the stator 140.

Therefore, the motor 100 of the present embodiment is formed in the stator 140 by forming a double-bonded structure of the stator 140 is a part of the inner circumferential surface of the stator 140 by the press-fit, the other part is bonded by the adhesive 170 It is possible to suppress the micro vibrations.

Furthermore, if the motor 100 of the present embodiment is applied to a hard disk drive, the disk can be stably driven, thereby preventing the occurrence of RRO that can occur in a specific driving frequency band.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

1 is a cross-sectional view showing a motor according to an embodiment of the present invention.

2 is a cross-sectional view showing a part of a motor according to an embodiment of the present invention.

100: motor 110: base

120: shaft 130: rotor

140: stator 150: sleeve

160: support portion 162: press-fit portion

164: bonding unit 166: step

Claims

A rotor to which the magnet is coupled;

A shaft coupled with the rotor;

A sleeve rotatably supporting the shaft;

A stator opposing the magnet;

A base having an outer circumferential surface formed therein with a support portion press-fitted into a part of the inner circumferential surface of the stator; And

And an adhesive interposed between the remaining portion of the inner circumferential surface of the stator and the outer circumferential surface of the support portion.

The method of claim 1,

The motor, characterized in that the step is formed on the outer peripheral surface of the support so that the adhesive is filled.