KR20080074331A - Spindle motor - Google Patents

Spindle motor Download PDF

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Publication number
KR20080074331A
KR20080074331A KR1020070013230A KR20070013230A KR20080074331A KR 20080074331 A KR20080074331 A KR 20080074331A KR 1020070013230 A KR1020070013230 A KR 1020070013230A KR 20070013230 A KR20070013230 A KR 20070013230A KR 20080074331 A KR20080074331 A KR 20080074331A
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KR
South Korea
Prior art keywords
wall
lower cover
spindle motor
side wall
stator
Prior art date
Application number
KR1020070013230A
Other languages
Korean (ko)
Inventor
김용주
Original Assignee
엘지이노텍 주식회사
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Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070013230A priority Critical patent/KR20080074331A/en
Publication of KR20080074331A publication Critical patent/KR20080074331A/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/16—Centering rotors within the stator; Balancing rotors
    • H02K15/165—Balancing the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/02—Casings or enclosures characterised by the material thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/04—Balancing means

Abstract

A spindle motor is provided to prevent a lower cover from being deformed by bonding the lower cover of a synthetic resin to a turn-table. A spindle motor includes a bearing housing(110), a rotation axis(120), a stator(130), a rotator(140), a turn-table(150), a lower cover(170), and a plurality of balls(160). The bearing housing has a bearing. The rotation axis is supported by the bearing and is rotatably installed. The stator is arranged on an outer circumference of the bearing housing. The rotator is fixed on the rotation axis, and rotates by the action with the stator. The turn-table has a table unit, an inner side wall and an outer side wall. The table unit is coupled to an outer circumference plane of the rotation axis of the rotator. A disk is mounted on the table unit. The inner side wall and the outer wall side of a ring shape are formed on a bottom plane of the table unit to have a predetermined gap. The lower cover of a synthetic resin is coupled to the inner side wall and the outer side wall. The balls are stored in a space which is formed by the inner side wall, the outer side wall and the lower cover.

Description

스핀들 모터 {SPINDLE MOTOR}Spindle Motors {SPINDLE MOTOR}

도 1a는 종래의 스핀들 모터의 단면도.1A is a cross-sectional view of a conventional spindle motor.

도 1b는 도 1a에 도시된 턴테이블과 하부커버의 분리도.FIG. 1B is an exploded view of the turntable and lower cover shown in FIG. 1A;

도 2a는 본 발명의 일 실시예에 따른 스핀들 모터의 단면도.2A is a cross-sectional view of a spindle motor in accordance with one embodiment of the present invention.

도 2b는 도 2a에 도시된 턴테이블과 하부커버의 분리도.Figure 2b is an exploded view of the turntable and the lower cover shown in Figure 2a.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

110 : 베어링하우징 120 : 회전축110: bearing housing 120: rotating shaft

130 : 고정자 140 : 회전자130: stator 140: rotor

150 : 턴테이블 160 : 볼150: turntable 160: ball

170 : 하부커버170: lower cover

본 발명은 스핀들 모터에 관한 것이다.The present invention relates to a spindle motor.

도 1a는 종래의 스핀들 모터의 단면도이고, 도 1b는 도 1a에 도시된 턴테이블과 하부커버의 분리도로서, 이를 설명한다.Figure 1a is a cross-sectional view of a conventional spindle motor, Figure 1b is an exploded view of the turntable and the lower cover shown in Figure 1a, it will be described.

도시된 바와 같이, 베어링하우징(11)에 내장된 베어링(13)에 회전축(15)이 지지되어 회전가능하게 설치된다. 베어링하우징(11)의 외면에는 고정자(17)가 고정되고, 회전축(15)의 외주면에는 고정자(17)와 작용하여 회전하는 회전자(19)가 결합된다.As shown, the rotating shaft 15 is supported on the bearing 13 embedded in the bearing housing 11 so as to be rotatably installed. A stator 17 is fixed to an outer surface of the bearing housing 11, and a rotor 19 that rotates by acting with the stator 17 is coupled to an outer circumferential surface of the rotating shaft 15.

회전축(15)에는 디스크(50)가 탑재되는 합성수지제의 턴테이블(21)이 고정되는데, 턴테이블(21)의 저면에는 상호 소정 간격을 가지는 내측테(21a)와 외측테(21b)가 형성된다. 그리고, 내측테(21a)와 외측테(21b)의 단면(端面)에는 금속제의 하부커버(23)가 압입 결합된다.The rotary shaft 15 is fixed to the turntable 21 made of synthetic resin on which the disk 50 is mounted. On the bottom of the turntable 21, inner edges 21a and outer edges 21b having predetermined intervals are formed. The lower cover 23 made of metal is press-fitted to the end faces of the inner frame 21a and the outer frame 21b.

내측테(21a)와 외측테(21b) 및 하부커버(23)에 의하여 형성되는 공간에는 금속제의 복수의 볼(25)이 저장되는데, 볼(25)은 스핀들 모터의 회전시 편심의 반대방향으로 이동하여 스핀들 모터의 편심으로 인해 발생하는 진동을 저감시킨다. 그리고, 하부커버(23)의 상면에는 하부커버(23)와 볼(25)이 직접 접촉하는 것을 방지하여 소음을 저감하기 위한 고무제의 펠트(27)가 접착된다.In the space formed by the inner frame 21a, the outer frame 21b, and the lower cover 23, a plurality of metal balls 25 are stored. The balls 25 are arranged in the opposite direction of the eccentricity when the spindle motor rotates. To reduce vibration caused by eccentricity of the spindle motor. In addition, the upper surface of the lower cover 23 is bonded with a rubber felt 27 to prevent the lower cover 23 from directly contacting the ball 25 to reduce noise.

상기와 같은 종래의 스핀들 모터는 하부커버(23)가 금속제이므로 합성수지제의 턴테이블(21)에 본딩 결합하지 못하고, 하부커버(23)를 내측테(21a) 및 외측테(21b)에 압입 결합한다. 그런데, 하부커버(23)의 두께가 얇으므로 압입 공정 도중 하부커버(23)가 쉽게 변형되고, 이로인해 하부커버(23)에 접착된 펠트(27)의 평편도가 나빠지므로, 볼(25)이 원활하게 구름운동 하지 못한다. 이로인해 진동 및 소음이 많이 발생하는 단점이 있다.In the conventional spindle motor as described above, since the lower cover 23 is made of metal, the lower cover 23 is not bonded to the turntable 21 made of synthetic resin, and the lower cover 23 is press-coupled to the inner frame 21a and the outer frame 21b. . However, since the thickness of the lower cover 23 is thin, the lower cover 23 is easily deformed during the press fitting process, and thus the flatness of the felt 27 adhered to the lower cover 23 is worsened. This does not cloud smoothly. This has the disadvantage of generating a lot of vibration and noise.

또한, 펠트(27)의 두께가 얇고 폭이 좁으므로 하부커버(23)에 펠트(27)를 평편하게 접착하기 어렵다. 그러므로, 펠트(27)의 평편도가 나빠지고, 이로인해, 볼(25)이 원활하게 구름운동을 하지 못하여, 진동 및 소음이 더욱 많이 발생하는 단점이 있다.In addition, since the thickness of the felt 27 is thin and the width is narrow, it is difficult to flatten the felt 27 to the lower cover 23. Therefore, the flatness of the felt 27 is deteriorated, and thus, the ball 25 does not smoothly move the cloud, there is a disadvantage that more vibration and noise is generated.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위하여 안출된 것으로, 본 발명의 목적은 진동 및 소음을 저감할 수 있는 스핀들 모터를 제공함에 있다.The present invention has been made to solve the problems of the prior art as described above, an object of the present invention to provide a spindle motor that can reduce vibration and noise.

상기 목적을 달성하기 위한 본 발명에 따른 스핀들 모터는, 베어링이 내장된 베어링하우징; 상기 베어링에 지지되어 회전가능하게 설치된 회전축; 상기 베어링하우징의 외주측에 배치된 고정자; 상기 회전축에 고정되며 상기 고정자와 작용하여 회전하는 회전자; 상기 회전자 상측의 상기 회전축 외주면에 결합되며 디스크가 탑재되는 테이블부, 상기 테이블부의 저면에 상호 소정 간격을 가지면서 형성된 링형상의 내측벽및 외측벽을 가지는 턴테이블; 상기 내측벽 및 상기 외측벽에 결합되는 합성수지제의 하부커버; 상기 내측벽과 상기 외측벽 및 상기 하부커버에 의하여 형성되는 공간에 저장되는 복수의 볼을 포함한다.Spindle motor according to the present invention for achieving the above object is a bearing housing built-in bearing; A rotating shaft rotatably supported by the bearing; A stator disposed on an outer circumferential side of the bearing housing; A rotor fixed to the rotation shaft and rotating in action with the stator; A turntable coupled to an outer circumferential surface of the upper side of the rotor and having a table portion on which a disk is mounted, and a ring-shaped inner wall and an outer wall formed at predetermined intervals on a bottom surface of the table portion; A lower cover made of synthetic resin coupled to the inner wall and the outer wall; It includes a plurality of balls stored in the space formed by the inner wall, the outer wall and the lower cover.

이하, 첨부한 도면을 참조하여 본 발명의 일 실시예에 따른 스핀들 모터를 상세히 설명한다.Hereinafter, a spindle motor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2a는 본 발명의 일 실시예에 따른 스핀들 모터의 단면도이다.2A is a cross-sectional view of a spindle motor according to an embodiment of the present invention.

도시된 바와 같이, 상면이 개방된 원통형으로 마련되어 베이스(200)에 기립 설치된 베어링하우징(110)이 마련된다. 베어링하우징(110)의 내주면에는 베어 링(115)이 압입되어 설치되고, 베어링(115)에는 회전축(120)의 하부측이 지지되어 회전가능하게 설치된다.As shown, a bearing housing 110 is provided, the upper surface is provided in an open cylindrical shape standing on the base 200. The bearing 115 is press-fitted to the inner circumferential surface of the bearing housing 110, and the lower side of the rotating shaft 120 is supported to the bearing 115 to be rotatably installed.

베어링하우징(110)의 외주측에는 고정자(130)가 고정되고, 베어링하우징(110) 상측의 회전축(120) 외주면에는 회전자(140)가 고정된다.The stator 130 is fixed to the outer circumferential side of the bearing housing 110, and the rotor 140 is fixed to the outer circumferential surface of the rotating shaft 120 above the bearing housing 110.

고정자(130)는 베어링하우징(110)의 외주면에 고정된 코어(131)와 코어(131)에 권선된 코일(135)을 가지고, 회전자(140)는 저면이 개방된 원통형으로 마련되어 회전축(120)에 고정된 로터요크(141)와 로터요크(141)의 내주면에 접착되어 고정자(130)와 대향하는 마그네트(145)를 가진다. 그리하여, 코일(135)에 전류가 인가되면, 코일(135)과 마그네트(145) 사이에 형성되는 전자기력에 의하여 마그네트(145)가 회전하고, 이로인해 로터요크(141) 및 회전축(120)이 회전하는 것이다.The stator 130 has a core 131 fixed to the outer circumferential surface of the bearing housing 110 and a coil 135 wound on the core 131, and the rotor 140 is provided in a cylindrical shape with an open bottom surface thereof and has a rotating shaft 120. It is attached to the rotor yoke 141 and the inner circumferential surface of the rotor yoke 141 fixed to the) has a magnet 145 facing the stator 130. Thus, when a current is applied to the coil 135, the magnet 145 is rotated by the electromagnetic force formed between the coil 135 and the magnet 145, thereby rotating the rotor yoke 141 and the rotating shaft 120 It is.

로터요크(141) 상측의 회전축(120) 외주면에는 합성수지제의 턴테이블(150)이 고정되어 회전축(120)과 동일하게 회전하며, 턴테이블(150)에는 디스크(50)가 탑재되어 지지된다.The turntable 150 made of synthetic resin is fixed to the outer circumferential surface of the rotating shaft 120 on the upper side of the rotor yoke 141 to rotate in the same manner as the rotating shaft 120, and the disk 50 is mounted on the turntable 150.

회전축(120)의 회전에 의하여 턴테이블(150)이 회전하면, 턴테이블(150)과 디스크(50)의 편심에 의하여 진동이 발생한다. 턴테이블(150)의 내부에는 턴테이블(150) 및 디스크(50)의 편심에 의하여 발생하는 진동을 저감하기 위한 복수의 볼(160)이 저장되는데, 이를 도 2a 및 도 2b를 참조하여 설명한다. 도 2b는 도 2a에 도시된 턴테이블과 하부커버의 분리도이다.When the turntable 150 rotates by the rotation of the rotary shaft 120, vibration is generated by the eccentricity of the turntable 150 and the disk 50. A plurality of balls 160 are stored in the turntable 150 to reduce vibrations generated by the eccentricity of the turntable 150 and the disk 50, which will be described with reference to FIGS. 2A and 2B. FIG. 2B is an exploded view of the turntable and the lower cover shown in FIG. 2A.

도시된 바와 같이, 합성수지제로 형성되는 턴테이블(150)은 중앙부가 회전축(120)에 결합되며 상면에는 디스크(50)가 탑재되는 테이블부(151), 테이블 부(151)의 저면에 상호 소정 간격을 가지면서 형성된 내측벽(153) 및 외측벽(155)을 가진다.As shown, the turntable 150 formed of a synthetic resin has a center portion coupled to the rotation shaft 120 and the table 151 on which the disk 50 is mounted on the upper surface thereof, and a predetermined distance from each other on the bottom surface of the table portion 151. It has an inner wall 153 and an outer wall 155 formed while having.

내측벽(153)과 외측벽(155) 사이의 공간은 하부커버(170)에 의하여 밀폐된다. 상세히 설명하면, 하부커버(170)는 내측벽(153)과 대응되게 형성되어 내측벽(153)의 외주면에 상단부측이 본딩 결합되는 수직판(171)과 수직판(171)의 하단부에서 연장 형성되며 단부측이 외측벽(155)의 내주면에 본딩 결합되는 수평판(175)을 가진다. 이때, 볼은 내측벽(153)과 외측벽(155) 및 하부커버(170)에 의하여 형성되는 밀폐 공간에 저장된다.The space between the inner wall 153 and the outer wall 155 is sealed by the lower cover 170. In detail, the lower cover 170 is formed to correspond to the inner wall 153 and extends from the lower end of the vertical plate 171 and the vertical plate 171 to which the upper end is bonded to the outer circumferential surface of the inner wall 153. And an end side has a horizontal plate 175 bonded to the inner circumferential surface of the outer wall 155. In this case, the ball is stored in a sealed space formed by the inner wall 153, the outer wall 155, and the lower cover 170.

본 실시예에 따른 스핀들 모터는 하부커버(170)가 합성수지제로 마련되어 합성수지제의 턴테이블(150)에 본딩 결합되므로, 하부커버(170)를 턴테이블(150)에 결합할 때, 하부커버(170)가 변형되지 않는다. 따라서, 하부커버(170)의 수평판(173)과 접촉하여 구르는 볼(160)이 원활하게 구름운동한다.In the spindle motor according to the present embodiment, since the lower cover 170 is made of synthetic resin and bonded to the turntable 150 made of synthetic resin, the lower cover 170 is coupled to the turntable 150 when the lower cover 170 is coupled to the turntable 150. No deformation Therefore, the ball 160 rolling in contact with the horizontal plate 173 of the lower cover 170 smoothly moves.

하부커버(170)의 수평판(175)의 상면에는 돌출레일(177)이 형성되고, 돌출레일(177)은 중심부를 기준으로 하측으로 갈수록 폭이 넓어지는 형태로 양측이 경사지게 형성된다. 그리고, 돌출레일(177)의 중심부에 볼(160)이 접촉된다. 그러면, 내측벽(153)과 외측벽(155) 및 하부커버(170)에 의하여 형성되는 공간으로 이물질이 유입되어도, 이물질이 돌출레일(177)의 중심부에 쌓이지 않고, 돌출레일(177)의 중심부 외측으로 흘러가므로, 볼(160)은 이물질의 영향을 받지 않고 구름운동한다.Protruding rails 177 are formed on the upper surface of the horizontal plate 175 of the lower cover 170, the protruding rails 177 is formed to be inclined at both sides in the form of a wider width toward the lower side relative to the center. The ball 160 is in contact with the center of the protruding rail 177. Then, even when foreign matter flows into the space formed by the inner wall 153, the outer wall 155, and the lower cover 170, the foreign matter does not accumulate in the center of the protruding rail 177, and the outside of the center of the protruding rail 177. As it flows into, the ball 160 is clouded without being affected by foreign matter.

턴테이블(150)과 하부커버(170)의 견고한 결합을 위하여, 내측벽(153) 및 외측벽(155)에는 수직판(171)의 상단부측 및 수평판(175)의 단부측이 삽입되어 걸리 는 단면(段面)(153a,155a)이 각각 형성된다. 그리고, 하부커버(170)는 폴리카보네이트(Polycarbonate)로 형성되는 것이 바람직하다.In order to firmly couple the turntable 150 and the lower cover 170, the inner side wall 153 and the outer side wall 155 are inserted into the upper end side of the vertical plate 171 and the end side of the horizontal plate 175. 153a and 155a are formed, respectively. The lower cover 170 is preferably made of polycarbonate.

이상에서 설명한 바와 같이, 본 발명에 따른 스핀들 모터는 턴테이블에 결합되어 볼이 저장되는 공간을 형성하는 하부커버가 합성수지제로 형성되어 턴테이블에 본딩 결합된다. 그러므로, 하부커버를 턴테이블에 결합하여도 하부커버가 변형되지 않으므로, 하부커버와 접촉하여 운동하는 볼이 원활하게 구름운동한다. 이로인해, 진동 및 소음이 저감된다.As described above, the spindle motor according to the present invention is coupled to the turntable, the lower cover forming a space for storing the ball is formed of a synthetic resin is bonded to the turntable. Therefore, since the lower cover is not deformed even when the lower cover is coupled to the turntable, the ball moving in contact with the lower cover smoothly moves. This reduces vibration and noise.

또한, 종래의 스핀들 모터 처럼 펠트가 필요 없으므로, 볼의 운동을 방해하는 펠트의 변형으로 인한 문제점이 해소된다. 그러므로, 진동 및 소음이 더욱 저감된다.In addition, since the felt is not required as in the conventional spindle motor, the problem due to the deformation of the felt that obstructs the movement of the ball is solved. Therefore, vibration and noise are further reduced.

이상에서는, 본 발명의 일 실시예에 따라 본 발명을 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 변경 및 변형한 것도 본 발명에 속함은 당연하다.In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

Claims (4)

베어링이 내장된 베어링하우징;Bearing housings with embedded bearings; 상기 베어링에 지지되어 회전가능하게 설치된 회전축;A rotating shaft rotatably supported by the bearing; 상기 베어링하우징의 외주측에 배치된 고정자;A stator disposed on an outer circumferential side of the bearing housing; 상기 회전축에 고정되며 상기 고정자와 작용하여 회전하는 회전자;A rotor fixed to the rotation shaft and rotating in action with the stator; 상기 회전자 상측의 상기 회전축 외주면에 결합되며 디스크가 탑재되는 테이블부, 상기 테이블부의 저면에 상호 소정 간격을 가지면서 형성된 링형상의 내측벽및 외측벽을 가지는 턴테이블;A turntable coupled to an outer circumferential surface of the upper side of the rotor and having a table portion on which a disk is mounted, and a ring-shaped inner wall and an outer wall formed at predetermined intervals on a bottom surface of the table portion; 상기 내측벽 및 상기 외측벽에 결합되는 합성수지제의 하부커버;A lower cover made of synthetic resin coupled to the inner wall and the outer wall; 상기 내측벽과 상기 외측벽 및 상기 하부커버에 의하여 형성되는 공간에 저장되는 복수의 볼을 포함하는 스핀들 모터.And a plurality of balls stored in a space formed by the inner wall, the outer wall, and the lower cover. 제 1 항에 있어서,The method of claim 1, 상기 하부커버는 상기 내측벽과 대응되게 형성되어 상기 내측벽에 본딩 결합되는 수직판과 상기 수직판의 하단부에서 연장 형성되며 단부측이 상기 외측벽에 본딩 결합되는 수평판을 가지고,The lower cover has a vertical plate which is formed to correspond to the inner wall and bonded to the inner wall and extends from the lower end of the vertical plate and has an end side bonded to the outer wall, 상기 수평판의 상면에는 상기 볼이 접촉하는 돌출레일이 형성된 것을 특징으로 하는 스핀들 모터.Spindle motor, characterized in that the protruding rail contacting the ball is formed on the upper surface of the horizontal plate. 제 2 항에 있어서,The method of claim 2, 상기 돌출레일은 상기 볼이 접촉하는 중심부를 기준으로 하측으로 갈수록 폭이 넓어지는 형태로 경사지게 형성된 것을 특징으로 하는 스핀들 모터.The protruding rail is a spindle motor, characterized in that formed inclined in a shape that is wider toward the lower side with respect to the center of the ball contact. 제 1 항 내지 제 3 항 중, 어느 한 항에 있어서,The method according to any one of claims 1 to 3, 상기 하부커버는 폴리카보네이트(Polycarbonate)로 형성된 것을 특징으로 하는 스핀들 모터.The lower cover is a spindle motor, characterized in that formed of polycarbonate (Polycarbonate).
KR1020070013230A 2007-02-08 2007-02-08 Spindle motor KR20080074331A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101052851B1 (en) * 2009-11-30 2011-07-29 삼성전기주식회사 motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101052851B1 (en) * 2009-11-30 2011-07-29 삼성전기주식회사 motor

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