JPH09322474A - Spindle motor of which rotary shaft having magnetic bearings is fixed - Google Patents
Spindle motor of which rotary shaft having magnetic bearings is fixedInfo
- Publication number
- JPH09322474A JPH09322474A JP8206982A JP20698296A JPH09322474A JP H09322474 A JPH09322474 A JP H09322474A JP 8206982 A JP8206982 A JP 8206982A JP 20698296 A JP20698296 A JP 20698296A JP H09322474 A JPH09322474 A JP H09322474A
- Authority
- JP
- Japan
- Prior art keywords
- hub
- magnet
- spindle motor
- magnetic
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/0408—Passive magnetic bearings
- F16C32/0423—Passive magnetic bearings with permanent magnets on both parts repelling each other
- F16C32/0425—Passive magnetic bearings with permanent magnets on both parts repelling each other for radial load mainly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Sliding-Contact Bearings (AREA)
- Motor Or Generator Frames (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】本発明は、ハードディスクド
ライブ(HDD) 等、磁気記録再生装置に使用するスピンド
ルモーターに関するものであって、より詳しくは、回転
軸がハウジングアセンブリに固定されたまま、ハブのみ
が回転する磁気ベアリングを有する回転軸が固定された
スピンドルモーターに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor used in a magnetic recording / reproducing apparatus such as a hard disk drive (HDD), and more particularly, to a hub only with a rotary shaft fixed to a housing assembly. The present invention relates to a spindle motor having a fixed rotating shaft having a magnetic bearing that rotates.
【０００２】[0002]
【従来の技術】一般に、ハードディスクドライブ(HDD)
又は磁気記録再生装置に使用するスピンドルモーター
は、図１に示したようなボールベアリング(Ball Bearin
g)タイプが多く使用されている。最近は、図２のような
オイル動圧流体ベアリング（又はエア動圧流体ベアリン
グ）も開発されて使用しているが、これらのベアリング
は次のような短所がある。2. Description of the Related Art Generally, a hard disk drive (HDD)
Alternatively, the spindle motor used in the magnetic recording / reproducing apparatus is a ball bearing (Ball Bearin) as shown in FIG.
g) Type is often used. Recently, oil dynamic pressure fluid bearings (or air dynamic pressure fluid bearings) as shown in FIG. 2 have been developed and used, but these bearings have the following disadvantages.
【０００３】即ち、図１に示したボールベアリング(a)
の場合、回転軸(b) の上下段に各々一つずつ一対を使用
しており、第１に、ボールの精度により回転程度が異な
り、第２に、騒音及び振動が大きく、第３に、潤滑油
（グリース）の粒子が飛散してハードディスクを損傷さ
せるので、これを遮るためのシール(Seal)、又は密閉構
造(e) が必要であり、第４に、高速回転に限界があるの
みならず、寿命が短く、第五に、衝撃に弱い。That is, the ball bearing (a) shown in FIG.
In this case, one pair is used for each of the upper and lower stages of the rotating shaft (b). First, the degree of rotation differs depending on the accuracy of the ball, second, noise and vibration are large, and third, Lubricating oil (grease) particles scatter and damage the hard disk, so a seal (Seal) or a sealed structure (e) to block this is required. Fourth, if there is only a limit to high speed rotation Fifth, it is vulnerable to shock.
【０００４】又、図２で示した動圧ベアリング(c) は、
回転軸(b) とハブ(d) との間に空隙を維持したまま、内
部にグルーブ溝又は櫛歯状加工等をしてオイル又はエア
として動圧を発生させて、これを維持するものであっ
て、第１に、オイル防止構造が必要であり、第２に、起
動及び停止時、金属接触音が発生し、第３に、摩擦が大
きく、第４に、低速回転が不安定であり、第５に、温度
特性が不均一である。Further, the dynamic pressure bearing (c) shown in FIG.
While maintaining a gap between the rotating shaft (b) and the hub (d), groove grooves or comb teeth are internally processed to generate dynamic pressure as oil or air, which is maintained. That is, firstly, an oil prevention structure is required, secondly, metal contact noise is generated at the time of starting and stopping, thirdly, friction is large, and fourthly, low speed rotation is unstable. Fifth, the temperature characteristics are non-uniform.
【０００５】それ以外に、上記２種類の従来ベアリング
は共に製作し難く、価格が高い短所がある。In addition to the above, the conventional bearings of the above two types are both difficult to manufacture, and are expensive.
【０００６】[0006]
【発明が解決しようとする課題】従って、本発明は、上
記のような従来の種々の問題を解決するために案出した
ものであって、本発明の目的は、回転軸とハブの内筒部
との間に磁性を有する磁石を介装して、互いに同じ極が
有する斥力と、他の極が有する引力とにより互いに摩擦
無しに回転する、磁気ベアリングを有する回転軸が固定
されたスピンドルモーターを提供することにある。SUMMARY OF THE INVENTION Therefore, the present invention has been devised in order to solve the various conventional problems described above, and an object of the present invention is to provide an inner cylinder for a rotating shaft and a hub. Spindle motor having a fixed rotating shaft having a magnetic bearing, in which a magnet having magnetism is interposed between the two parts and rotating without friction due to a repulsive force of the same pole and an attractive force of the other pole. To provide.
【０００７】[0007]
【課題を解決するための手段】そして、これのための特
徴的な構成は内側にステータを有し、中央に回転軸が立
設されたハウジングアセンブリと、その上で外筒部の内
周縁に回転子マグネットを有するまま、内筒部が上記回
転軸に嵌め込まれて回転するハブとから構成されたスピ
ンドルモーターにおいて、上記回転軸に上下に極が異な
る各々の軸部磁石を挿着し、上記ハブの内筒部の内周面
に上下に極が異なる各々のハブ部磁石を付着して、上記
磁石の斥力及び引力によりハブが浮上したまま、接触無
しに回転できる磁気ベアリングを有する回転軸が固定さ
れたスピンドルモーターに存する。A characteristic structure therefor is a housing assembly having a stator inside and a rotating shaft standing upright in the center, and on the inner peripheral edge of the outer cylinder portion on the housing assembly. A spindle motor having a rotor magnet and an inner cylinder part fitted into the rotating shaft and rotating with a hub. In the spindle motor, shaft members each having different poles are vertically attached to the rotating shaft. By attaching hub magnets having different poles vertically to the inner peripheral surface of the inner cylinder of the hub, a revolving shaft having a magnetic bearing that can rotate without contact while the hub is levitated by the repulsive force and attractive force of the magnet It exists in a fixed spindle motor.
【０００８】[0008]
【発明の実施の形態】図３は、本発明によるスピンドル
モーターを示す断面図であって、内側にステータ(11)を
有し、中央に回転軸(3) が立設されたハウジングアセン
ブリ(1) と、その上で外筒部(22)の内周縁に回転子マグ
ネット(23)を有したまま、内筒部(21)が上記の回転軸
(3) に嵌め込まれて回転するハブ(2) とを備えている。FIG. 3 is a cross-sectional view showing a spindle motor according to the present invention, which has a housing (1) having a stator (11) inside and a rotating shaft (3) standing upright in the center. ), And with the rotor magnet (23) provided on the inner peripheral edge of the outer tubular portion (22) above the inner tubular portion (21),
It has a hub (2) which is fitted into (3) and rotates.
【０００９】ハウジングアセンブリ(1) に固定された上
記回転軸(3) には、上下に極が異なる各々の軸部磁石(4
a),(4b) を挿着し、又上記ハブ(2) の内筒部(21)の内周
面には、これと同様に、上下に極が異なる各々のハブ部
磁石(5a)、（5b) を付設している。The rotary shaft (3) fixed to the housing assembly (1) has shaft magnets (4
a) and (4b) are attached, and on the inner peripheral surface of the inner cylindrical portion (21) of the hub (2), similarly, each hub magnet (5a) with different poles is arranged vertically. (5b) is attached.
【００１０】より詳しく言えば、上記回転軸(3) の中段
には、上下一対の軸部磁石(4a)、（4b) を結合するが、
この磁石は円筒形であって軸を嵌め合わせて結合したも
のであり、上下極の配列が上半部Ｎ極、下半部Ｓ極で互
いに異なっている。More specifically, a pair of upper and lower shaft magnets (4a) and (4b) are connected to the middle stage of the rotating shaft (3).
This magnet has a cylindrical shape and has shafts fitted to each other and coupled to each other. The arrangement of upper and lower poles is different between the upper half N pole and the lower half S pole.
【００１１】さらに、ハブ(2) の内筒部(21)の内周面に
も、上下一対のハブ部磁石(5a)、(5b)を付設している
が、これらも、同様に円筒形であって、上下の極は、上
記回転軸(3) の軸部磁石のように上方がＮ極、下方がＳ
極に配列されている。Further, a pair of upper and lower hub magnets (5a) and (5b) are attached to the inner peripheral surface of the inner cylindrical portion (21) of the hub (2), and these magnets also have a cylindrical shape. As for the upper and lower poles, like the shaft magnet of the rotating shaft (3), the upper pole is the N pole and the lower pole is the S pole.
It is arranged in a pole.
【００１２】従って、本発明の回転軸(3) と、ハブ(2)
は、図３に詳細に示されているように、上半部のＮ極と
Ｎ極が有する水平方向の斥力、及びＳ極とＳ極が有する
水平方向の斥力により、互いに触れない状態で回転でき
るものであり、これら磁石の極は上下を逆にしても同一
である。Therefore, the rotating shaft (3) of the present invention and the hub (2)
As shown in detail in FIG. 3, the N-poles rotate without touching each other due to the horizontal repulsive forces of the N poles and N poles in the upper half and the horizontal repulsive forces of S poles and S poles. Yes, the poles of these magnets are the same when turned upside down.
【００１３】又、図４に示したように、上記軸部上側の
磁石(4a)は、その磁気中心(A) がハブ部上側の磁石(5a)
が有する磁気中心(B) より低い位置にあるため、下方に
斥力及び引力を受け、軸部下側の磁石(4b)は、その磁気
中心(C) がハブ部下側の磁石(5b)が有する磁気中心(D)
より高い位置にあるため、上方に斥力及び引力を受け
る。Further, as shown in FIG. 4, the magnet (4a) on the upper side of the shaft portion has its magnetic center (A) on the magnet (5a) on the upper side of the hub portion.
Since it is located lower than the magnetic center (B) of the magnet, it receives repulsive force and attractive force downward, and the magnet (4b) below the shaft has a magnetic center (C) that is lower than that of the magnet (5b) below the hub. Center (D)
Since it is at a higher position, it receives repulsive force and attractive force upward.
【００１４】それ故に、これらの軸部磁石(4a)、(4b)と
ハブ部磁石(5a)、(5B)は互いに均衡が取れた状態で浮上
して安定されており、回転する時も、このような力は変
わらないものであり、この時、磁石の磁力を強くするほ
ど、強性も強く調節できるものである。Therefore, the shaft magnets (4a), (4b) and the hub magnets (5a), (5B) are floated and stabilized in a balanced state, and when rotating, Such force does not change, and at this time, the stronger the magnetic force of the magnet, the stronger the strength can be adjusted.
【００１５】一方、本発明は、図５〜図１１に示された
ように他の態様でも実施することができる。On the other hand, the present invention can be implemented in other modes as shown in FIGS.
【００１６】図５は、上下側ハブ部磁石(5a)、(5b)の境
界部分に円周溝(5c)を形成して、ここに相対する磁石と
の中段部分の隙間を大きくしたものである。In FIG. 5, a circumferential groove (5c) is formed at the boundary between the upper and lower hub magnets (5a) and (5b) to increase the gap between the magnet and the middle stage. is there.
【００１７】このようにすると、その上下部の磁力が有
する力は、コリオリ効果により両方のフラックスが強く
なるので、磁力の有効部分が有する斥力をより強くする
ことができる。With this arrangement, the magnetic force of the upper and lower portions of the magnetic flux strengthens both fluxes due to the Coriolis effect, so that the repulsive force of the effective portion of the magnetic force can be increased.
【００１８】又、図６は、本発明のハブ部磁石(5a)、(5
b)の内側に非磁性体の金属板材(6)を付設したものであ
って、その内側の中心にある軸部磁石(4a)、(4b)に対し
て磁力の程度を管理できるようにしたものである。FIG. 6 shows the hub magnets (5a), (5
A non-magnetic metal plate (6) is attached inside b) so that the degree of magnetic force can be controlled for the shaft magnets (4a), (4b) at the center of the inside. It is a thing.
【００１９】又、図７は、図６のようにハブ部磁石(5
a)、(5b)の内側に非磁性体の金属板材(6) を付設する
が、その金属板材(6) の中段部で図５のように円周溝(6
a)を形成したものであって、磁力の程度を管理しながら
コリオリの効果があるようにしたものである。Further, FIG. 7 shows the hub magnet (5
A non-magnetic metal plate (6) is attached to the inside of (a) and (5b).
A) is formed so that the Coriolis effect can be achieved while controlling the degree of magnetic force.
【００２０】又、図８は、回転軸(3) の周りに軸部磁石
を嵌め込むのではなく、軸部磁石(4a)、(4b)を円柱形に
して回転軸(3) の中段部を構成したものであって、回転
軸の回りに軸部磁石を嵌め込むことにより、直径が小さ
くなるので、縮小指向的な設計に従うことができるよう
になる。Further, in FIG. 8, the shaft magnets are not fitted around the rotary shaft (3), but the shaft magnets (4a), (4b) are formed into a cylindrical shape, and the middle stage portion of the rotary shaft (3) is shown. Since the diameter is reduced by fitting the shaft magnet around the rotary shaft, it is possible to comply with the reduction-oriented design.
【００２１】又、図９は、ハブ部磁石(5a)、(5b)に非磁
性体の金属板材(6) を付設するものではあるが、内周縁
ではなく、外周縁に付着することにより、やはり磁力の
程度を管理できるようにするものである。Further, in FIG. 9, the hub magnets (5a), (5b) are provided with a non-magnetic metal plate material (6), but by attaching to the outer peripheral edge instead of the inner peripheral edge, After all, it makes it possible to control the degree of magnetic force.
【００２２】又、図１０は、図８のようにハブ部磁石(5
a)、(5b)の内側に非磁性体の金属板材(6) を付設し、そ
の金属板材(6) の中段部に円周溝(6a)を形成するが、こ
れに対応する軸部の磁石(4a)、(4b)にも円筒面の中段で
円周溝(4c)を形成することで、磁力の程度を管理しなが
らコリオリ効果がより大きくなるようにしたものであ
る。Further, FIG. 10 shows the hub magnet (5
A non-magnetic metal plate (6) is attached inside a) and (5b), and a circumferential groove (6a) is formed in the middle part of the metal plate (6). By forming the circumferential groove (4c) on the magnets (4a) and (4b) in the middle stage of the cylindrical surface, the Coriolis effect is further increased while controlling the degree of magnetic force.
【００２３】さらに、図１１は、ハブ(2) の内底面に鉄
(Fe)材の磁力遮断板材(7) を付設したものであって、上
記軸部磁石(4a)、（4b) 及びハブ部磁石(5a)、(5b)から
出る磁力がハードディスクドライブの他の部分に影響を
及ばないように配慮したものである。Further, FIG. 11 shows that the inner bottom surface of the hub (2) is made of iron.
A magnetic force blocking plate material (7) of (Fe) material is attached, and the magnetic force emitted from the shaft magnets (4a), (4b) and the hub magnets (5a), (5b) is different from that of other hard disk drives. It is designed so that it does not affect the parts.
【００２４】[0024]
【発明の効果】以上、詳細に説明した通り、本発明は、
従来の一般的なベアリングの代わりに、固定されている
回転軸(3) の軸部の磁石(4a)、(4b)と、内筒部(21)の中
のハブ部磁石(5a)、(5b)としてベアリング機能を遂行す
るようにしたため、回転時は勿論、停止時にも接触が無
いものであり、従って、騒音及び振動が無いのみなら
ず、低速及び高速で回転が均一な長所があり、温度変化
による特性変化が少なく、非同期回転振幅が大変小さ
く、特に磁石の材質を金属、プラスチック、ゴム等多様
に選択でき、又その強度及び隙間、長さ等を適当に変更
してモーターの特性に合わせて設計するのが容易である
ので、広く使用され得るものである。As described above, the present invention provides:
Instead of the conventional general bearing, the magnets (4a), (4b) of the shaft part of the fixed rotating shaft (3) and the hub magnets (5a), ((a) of the inner cylinder part (21) Since the bearing function is performed as 5b), there is no contact not only at the time of rotation but also at the time of stop. Therefore, not only there is no noise and vibration, but there is an advantage that the rotation is uniform at low speed and high speed. Characteristic change due to temperature change is small, asynchronous rotation amplitude is extremely small, magnet material can be selected from various materials such as metal, plastic, rubber, etc. Also, strength, gap, length, etc. can be changed appropriately for motor characteristics. It can be widely used because it is easy to design together.
【００２５】なお、本件発明の思想を上記実施形態によ
って具体的に説明したが、本発明は上記実施形態に限定
されるものではなく、その要旨を逸脱しない範囲内で種
々変更できることはいうまでもない。Although the idea of the present invention has been specifically described by the above embodiment, it is needless to say that the present invention is not limited to the above embodiment and can be variously modified without departing from the scope of the invention. Absent.
【図１】 ボールベアリングを有する従来のスピンドル
モーターの断面図。FIG. 1 is a sectional view of a conventional spindle motor having a ball bearing.
【図２】 動圧ベアリングを有する従来のスピンドルモ
ーターの断面図。FIG. 2 is a sectional view of a conventional spindle motor having a dynamic pressure bearing.
【図３】 本発明によるスピンドルモーターの断面図。FIG. 3 is a sectional view of a spindle motor according to the present invention.
【図４】 本発明の要部断面図。FIG. 4 is a sectional view of a main part of the present invention.
【図５】 本発明の他の実施形態を示す断面図。FIG. 5 is a sectional view showing another embodiment of the present invention.
【図６】 本発明の他の実施形態を示す断面図。FIG. 6 is a sectional view showing another embodiment of the present invention.
【図７】 本発明の他の実施形態を示す断面図。FIG. 7 is a sectional view showing another embodiment of the present invention.
【図８】 本発明の他の実施形態を示す断面図。FIG. 8 is a cross-sectional view showing another embodiment of the present invention.
【図９】 本発明の他の実施形態を示す断面図。FIG. 9 is a cross-sectional view showing another embodiment of the present invention.
【図１０】 本発明の他の実施形態を示す断面図。FIG. 10 is a cross-sectional view showing another embodiment of the present invention.
【図１１】 本発明の他の実施形態を示す断面図。FIG. 11 is a cross-sectional view showing another embodiment of the present invention.
１：ハウジングアセンブリ ２：ハブ ３：回転軸 ４ａ、４ｂ：軸部磁石 ４ｃ：円周溝 ５ａ、５ｂ：ハブ部磁石 ６：金属部材 ７：磁力遮断板材 1: Housing assembly 2: Hub 3: Rotating shaft 4a, 4b: Shaft magnet 4c: Circumferential groove 5a, 5b: Hub magnet 6: Metal member 7: Magnetic force blocking plate material
Claims (10)
設されたハウジングアセンブリと、その上で外筒部の内
周縁に回転子マグネットを有するまま、内筒部が上記回
転軸に嵌め込まれて回転するハブとから構成されたスピ
ンドルモーターにおいて、 上記回転軸に上下に極が異なる各々の軸部磁石を挿着
し、 上記ハブの内筒部の内周面に上下に極が異なる各々のハ
ブ部磁石を付設して、 上記磁石の斥力及び引力によりハブが浮上したまま、接
触無しに回転できるようにしたことを特徴とする、磁気
ベアリングを有する回転軸が固定されたスピンドルモー
ター。1. A housing assembly having a stator inside and a rotating shaft standing upright in the center, and a rotor magnet on the inner peripheral edge of an outer cylindrical portion above the housing assembly, while the inner cylindrical portion is attached to the rotating shaft. In a spindle motor composed of a hub that is fitted and rotates, each shaft magnet having different poles vertically is inserted and attached to the rotating shaft, and the poles are vertically different on the inner peripheral surface of the inner cylindrical portion of the hub. A spindle motor having a fixed rotating shaft having a magnetic bearing, wherein each hub magnet is attached so that the hub can be rotated without contact while the hub is levitated by the repulsive force and attractive force of the magnet.
した時、その外側のハブ部の磁石も上下Ｎ、Ｓに同様に
配列して相互内外側の磁石の斥力が大きく作用するよう
にしたことを特徴とする請求項１記載のスピンドルモー
ター。2. When the shaft magnets of the rotating shaft are arranged in the upper and lower N and S, the magnets of the outer hub are also arranged in the upper and lower N and S in the same manner, so that the repulsive forces of the magnets inside and outside are large. The spindle motor according to claim 1, wherein the spindle motor is formed.
部磁石の磁性中心より高くし、上記下側のハブ部磁石の
磁性中心が下側の軸部磁石の磁性中心より低くして、各
々の斥力が軸部磁石の中段地点に向かって作用するよう
になされることを特徴とする請求項１記載のスピンドル
モーター。3. The magnetic center of the upper hub magnet is made higher than the magnetic center of the upper shaft magnet, and the magnetic center of the lower hub magnet is made lower than the magnetic center of the lower shaft magnet. The spindle motor according to claim 1, wherein each repulsive force acts toward a middle stage of the shaft magnet.
円周溝を形成して、その上下部分の磁力が、コリオリ効
果によりさらに有効になるようにしたことを特徴とする
請求項１記載のスピンドルモーター。4. A circumferential groove is formed on the inner side surface of the hub magnet from the intermediate upper contact portion so that the magnetic forces at the upper and lower portions of the circumferential groove are made more effective by the Coriolis effect. 1. The spindle motor according to 1.
周溝を形成して、その上下部分の磁力が、コリオリ効果
によりさらに有効になるようにしたことを特徴とする請
求項１記載のスピンドルモーター。5. A circular groove is formed on the outer peripheral surface from the intermediate upper contact portion of the shaft magnet so that the magnetic forces at the upper and lower portions thereof are more effective due to the Coriolis effect. 1. The spindle motor according to 1.
板材を接合して、磁力の程度を管理するようにしたこと
を特徴とする請求項１記載のスピンドルモーター。6. The spindle motor according to claim 1, wherein a thin non-magnetic metal plate material is joined to the inner peripheral surface of the hub magnet to control the degree of magnetic force.
に接合して、磁力の程度を管理するようにしたことを特
徴とする請求項６記載のスピンドルモーター。7. The spindle motor according to claim 6, wherein the non-magnetic metal plate material is joined to the outer peripheral surface of the hub magnet to control the degree of magnetic force.
形成して、その外側上下部分の磁力が、コリオリ効果に
よりさらに有効になるようにしたことを特徴とする請求
項６又は７記載のスピンドルモーター。8. A circumferential groove is formed at the middle height of the non-magnetic metal plate material so that the magnetic forces at the outer upper and lower portions thereof are further effective by the Coriolis effect. 7. The spindle motor according to 7.
中段部を構成したことを特徴とする請求項１記載のスピ
ンドルモーター。9. The spindle motor according to claim 1, wherein the shaft magnet is formed in a cylindrical shape to form a middle portion of the rotary shaft.
ることを遮断するため、磁力遮断板材を付設したことを
特徴とする請求項１記載のスピンドルモーター。10. The spindle motor according to claim 1, wherein a magnetic force blocking plate member is attached to the inner bottom surface of the hub to block the leakage of the magnetic force to the outside.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1996-18440 | 1996-05-29 | ||
| KR1019960018440A KR100224534B1 (en) | 1996-05-29 | 1996-05-29 | Magnetic bearing of spindle motor with a fixed rotary axis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09322474A true JPH09322474A (en) | 1997-12-12 |
| JP2873209B2 JP2873209B2 (en) | 1999-03-24 |
Family
ID=19460040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8206982A Expired - Fee Related JP2873209B2 (en) | 1996-05-29 | 1996-08-06 | Spindle motor with fixed rotating shaft with magnetic bearing |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2873209B2 (en) |
| KR (1) | KR100224534B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327142C (en) * | 2003-06-17 | 2007-07-18 | 财团法人工业技术研究院 | Magnetic bearing structure |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010064335A (en) * | 1999-12-29 | 2001-07-09 | 송재인 | Motor for driving optical disk |
| KR100401096B1 (en) * | 2000-06-24 | 2003-10-10 | 삼성전기주식회사 | Thrust magnetic bearing motor |
| KR101254147B1 (en) * | 2011-04-20 | 2013-04-18 | (주)계양정밀 | Turbo-charger having magnetic bearing |
| US9438089B2 (en) * | 2014-03-06 | 2016-09-06 | Baker Hughes Incorporated | Systems and methods for preventing rotation of rotor bearings in a stator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH054756U (en) * | 1991-06-27 | 1993-01-22 | 日本ビクター株式会社 | Spindle motor |
| JPH06235421A (en) * | 1993-02-05 | 1994-08-23 | Koyo Seiko Co Ltd | Spindle motor |
-
1996
- 1996-05-29 KR KR1019960018440A patent/KR100224534B1/en not_active IP Right Cessation
- 1996-08-06 JP JP8206982A patent/JP2873209B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH054756U (en) * | 1991-06-27 | 1993-01-22 | 日本ビクター株式会社 | Spindle motor |
| JPH06235421A (en) * | 1993-02-05 | 1994-08-23 | Koyo Seiko Co Ltd | Spindle motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327142C (en) * | 2003-06-17 | 2007-07-18 | 财团法人工业技术研究院 | Magnetic bearing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2873209B2 (en) | 1999-03-24 |
| KR970077917A (en) | 1997-12-12 |
| KR100224534B1 (en) | 1999-11-01 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |