JPS63157641A - Uniaxial control type magnetic bearing device - Google Patents

Uniaxial control type magnetic bearing device

Info

Publication number
JPS63157641A
JPS63157641A JP30344786A JP30344786A JPS63157641A JP S63157641 A JPS63157641 A JP S63157641A JP 30344786 A JP30344786 A JP 30344786A JP 30344786 A JP30344786 A JP 30344786A JP S63157641 A JPS63157641 A JP S63157641A
Authority
JP
Japan
Prior art keywords
bearing
bearing box
thrust
flange
auxiliary
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.)
Pending
Application number
JP30344786A
Other languages
Japanese (ja)
Inventor
Wataru Mizutani
亘 水谷
Makoto Okano
真 岡野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP30344786A priority Critical patent/JPS63157641A/en
Publication of JPS63157641A publication Critical patent/JPS63157641A/en
Pending legal-status Critical Current

Links

Landscapes

  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

PURPOSE:To obtain the light and simple structure of a rotary shaft for a high-speed rotary body, by a method wherein an auxiliary bearing device, supported elastically, is provided in the title device. CONSTITUTION:A bearing box 15 is supported elastically against both of the directions of a thrust and a radial force by an elastic body 16 for restricting the thrust, whose one end is fixed to an auxiliary bearing supporting table 17, and a radial damper 18, in order to absorb and restrain the vibrations of a rotary shaft 2. The annular section 18A of the radial damper 18 is fitted to the peripheral rim of a shaft hole 7A and the tip end of a bearing holding section 18B is brought in contact with the peripheral surface of the flange section 15A of an auxiliary bearing box to support the flange section 7 on the bearing box holding section 18B by elasticity. In order not to rotate the bearing box 15 together with the rotary shaft, a fixing screw 20, fixing the auxiliary bearing supporting table 17 to the flange 7, is fitted loosely into a clearance hole 15C whereby the bearing box 15 moves slightly into the axial direction thereof. A shim member 21, interposed between the large flange part 15B of the bearing box 15 and the flange 7, is indented with corrugated grooves to obtain shock absorbing effect against a minute movement of the bearing box 15 in the direction of the thrust thereof.

Description

【発明の詳細な説明】 (a業上の利用分野) 本発明は、1 fIh制御型磁気軸受装置に関し、詳し
くは、高速回転体の軸を安定した回転状態に支承するた
めに補助軸受装置を設けた1軸制御型磁気軸受装置に関
する。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a 1 fIh control type magnetic bearing device, and more specifically, to an auxiliary bearing device for supporting the shaft of a high-speed rotating body in a stable rotational state. The present invention relates to a single-axis controlled magnetic bearing device.

(従来の技術) 従来、高速回転する軸を支承するのに使用される磁気軸
受として一般的なのは多軸制御型磁気軸受であり、その
−例を第4図に示す。ここで、1はモータ、2はその回
転軸であり、軸2の両端部には電磁石を用いたラジアル
軸受3およびスラスト軸受4が配置され、更に軸2のラ
ジアル方向の姿勢を制御するために更にラジアル位置セ
ンサ5が軸2に近接して配設されている。なお6はモー
タ1の外殻ケーシングである。
(Prior Art) Conventionally, a multi-axis control type magnetic bearing has been commonly used as a magnetic bearing to support a shaft rotating at high speed, and an example thereof is shown in FIG. Here, 1 is a motor, 2 is its rotating shaft, and a radial bearing 3 and a thrust bearing 4 using electromagnets are arranged at both ends of the shaft 2. Furthermore, in order to control the attitude of the shaft 2 in the radial direction, Furthermore, a radial position sensor 5 is arranged close to the shaft 2. Note that 6 is an outer shell casing of the motor 1.

しかし、かかる多軸制御型磁気軸受装置においては、ス
ラスト方向と共にラジアル方向の51’+b方向につい
て、制御されねばならず、制御回路が著しく複雑となり
、更にはセンサの数も多く高価となり、また、電磁石を
数多くラジアル方向ならびに軸方向に配列させるため軸
受部が太くなって軸2自体の構造もa雑で太くかつ長く
なる。
However, in such a multi-axis control type magnetic bearing device, control must be performed in the 51'+b direction of the radial direction as well as the thrust direction, and the control circuit becomes extremely complex, and furthermore, the number of sensors is large, making it expensive. Since a large number of electromagnets are arranged in the radial and axial directions, the bearing portion becomes thicker, and the structure of the shaft 2 itself becomes rough, thick, and long.

従って、回転軸2が重く、また長くなることによって曲
げモーメントに対する固有振動数が低くなり、それ以上
の高速回転の実現が困難となるが、これに対して1軸制
御型磁気軸受は、スラスト板と電磁石若しくは永久磁石
との組合せによりてスラスト方向の1@しか制御しない
ので、制御回路および構造が共に簡単ですむという利点
を有°している。
Therefore, as the rotating shaft 2 becomes heavier and longer, the natural frequency with respect to the bending moment becomes lower, making it difficult to achieve higher rotation speeds.On the other hand, single-axis control type magnetic bearings Since only 1@ of the thrust direction is controlled by the combination of the magnet and the electromagnet or permanent magnet, it has the advantage that both the control circuit and the structure are simple.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、従来の1@h制御型磁気軸受装置にあっ
ては、その回転軸のラジアル方向の剛性を高く保つこと
ができないために、回転軸および軸受の剛性によって生
じる共振周波数が問題で、この共振周波数を乗越えて高
速回転が得られるようにする必要がある。
However, in the conventional 1@h control type magnetic bearing device, it is not possible to maintain high rigidity of the rotating shaft in the radial direction, so the problem is the resonance frequency caused by the rigidity of the rotating shaft and the bearing. It is necessary to overcome the frequency and obtain high-speed rotation.

すなわち、本発明の目的は、回転軸をできるだけ短く、
かつ軽量になし、しかもその特性を生かすために小型で
しかも高精度の軸受機能を発揮することのできる補助軸
受袋紐を具えた1軸制御型磁気軸受装置を提供すること
にある。
That is, the purpose of the present invention is to make the rotation axis as short as possible.
To provide a single-axis control type magnetic bearing device which is lightweight and equipped with an auxiliary bearing bag string, which is compact to take advantage of its characteristics and can exhibit a high-precision bearing function.

〔問題点を解決するための手段〕 かかる目的を達成するために、本発明は、回転体に設け
たスラスト板とスラスト板の対向位置に配設された磁石
とにより回転体の回転軸をスラスト方向およびラジアル
方向に対して浮揚状態に保つ1!ll1b制御型磁気軸
受装置において、スラストラジアルコンバインド型軸受
を有する軸受箱と、軸受箱をスラスト方向およびラジア
ル方向に弾性支持する部材とからなる補助軸受を回転軸
の両端部に設けたことを特徴とする。
[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for thrusting the rotating shaft of the rotating body using a thrust plate provided on the rotating body and a magnet disposed at a position opposite to the thrust plate. 1 to keep it buoyant with respect to direction and radial direction! The ll1b control type magnetic bearing device is characterized in that auxiliary bearings each consisting of a bearing box having a thrust-radial combined type bearing and a member that elastically supports the bearing box in the thrust direction and the radial direction are provided at both ends of the rotating shaft. do.

(作 用〕 本発明によれば、回転軸の両端部において、補助軸受を
収納した軸受箱が回転軸を回転中心線に保つように弾性
支持され、しかも補助軸受によって回転軸が補助的にス
ラスト方向およびラジアル方向に枢支されるので、共振
周波数発生回転にあっても弾性支持体を介して軸の振れ
回りが抑制され、また、起動時においてもモータの引力
にかかわりなく、回転軸を中心線に一致させた状態に保
つととができる。
(Function) According to the present invention, the bearing box housing the auxiliary bearings is elastically supported at both ends of the rotating shaft so as to keep the rotating shaft on the center line of rotation, and the auxiliary bearings provide additional thrust to the rotating shaft. Since it is pivoted in both the direction and the radial direction, the rotation of the shaft is suppressed through the elastic support even during rotation that generates a resonance frequency, and even during startup, the rotation axis remains centered regardless of the attractive force of the motor. If you keep it in line with the line, you can see.

〔実施例〕〔Example〕

゛以下に、図面に基づいて本発明の実施例を詳細かつ具
体的に説明する。
Embodiments of the present invention will be described below in detail and specifically based on the drawings.

第1図は本発明の一実施例を示す。本例は高周波モータ
への適用例を示し、ここで、IAおよびIBはモータl
のロータおよびステータ、11はロータIAの両端部に
配設されたスラスト板、12はスラスト板11の対向位
置に配置された電磁石であって、電磁石12の方はケー
シング6両端のフランジ部7に固定される。また、回転
軸2はロータIAが固定された太径部2Aと、テーバ部
2Bと細径部2Cとで構成され、一方の細径部2Cの軸
端には回転軸2のスラスト方向の位置を制御するための
位置センサ13が配設されている。
FIG. 1 shows an embodiment of the invention. This example shows an example of application to a high frequency motor, where IA and IB are motor l
11 is a thrust plate disposed at both ends of the rotor IA, 12 is an electromagnet disposed opposite the thrust plate 11, and the electromagnet 12 is attached to the flange portion 7 at both ends of the casing 6. Fixed. The rotating shaft 2 is composed of a large diameter portion 2A to which the rotor IA is fixed, a tapered portion 2B, and a narrow diameter portion 2C. A position sensor 13 is provided for controlling.

14は補助軸受、15は補助軸受14が装填されるカー
トリッジ型の軸受箱であって、本例では補助軸受14の
一方の端部をテーパ形となって、更に回転軸2との間に
は微細なすき間が保たれるようになして、好適にはカー
ボン、2硫化モリブデン等の固定潤滑剤によって形成す
る。なお、このような固体潤滑剤によって形成する代り
に玉軸受を用いるようにしてもよい。
14 is an auxiliary bearing, and 15 is a cartridge-type bearing box into which the auxiliary bearing 14 is loaded. It is preferably formed using a fixed lubricant such as carbon or molybdenum disulfide so that fine gaps are maintained. Note that instead of forming the solid lubricant, a ball bearing may be used.

かくしてこのような補助軸受、14によりスラスト方向
と共にラジアル方向に対しても支持することができ、か
つ、回転IThh2の共振時に軽く軸2に接触してその
ふれ回り振動を抑制することができ、しかも高速回転時
にあって軸2に大きい負荷がかかるようなことがない。
Thus, such an auxiliary bearing 14 can provide support in the radial direction as well as in the thrust direction, and can lightly contact the shaft 2 during resonance of the rotation IThh2 to suppress its whirling vibration. A large load is not applied to the shaft 2 during high-speed rotation.

また、停電時等においてもこれらの補助軸受14を介し
て軸2が軸支される。
Further, even during a power outage, the shaft 2 is supported via these auxiliary bearings 14.

ついで、軸受箱15を弾性支持する構造を第2図および
第3図によって説明する。回転軸2の双方の細径部2C
に設けられた軸受箱15は軸2の振動を吸収抑制するた
めにラジアル方向およびスラスト方向の両方向に対して
弾性支持される。すなわち、16は補助軸受支持台17
に一端が固定されたスラスト抑え用の弾性体、18はラ
ジアル方向の抑えばね(以下でラジアルダンパという)
である、なおスラスト抑えの弾性体16は板ばね、コイ
ルばね若しくはゴム等で構成される。また、ラジアルダ
ンパ18の方は例えば燐青銅等のばね材の丸棒から十分
精度よく芯出しされて、第3図に示すような形態に削り
出されるもので、環状部18Aと均等に内部に向けて絞
られた形状の歯形を有する軸受箱保持部18Bとを具え
ている。
Next, a structure for elastically supporting the bearing box 15 will be explained with reference to FIGS. 2 and 3. Both narrow diameter portions 2C of the rotating shaft 2
A bearing box 15 provided in the shaft 2 is elastically supported in both the radial direction and the thrust direction in order to absorb and suppress vibrations of the shaft 2. That is, 16 is an auxiliary bearing support stand 17
18 is a radial direction restraining spring (hereinafter referred to as a radial damper).
The thrust suppressing elastic body 16 is composed of a leaf spring, a coil spring, rubber, or the like. The radial damper 18 is centered precisely from a round bar of spring material such as phosphor bronze, and is machined into the shape shown in FIG. The bearing housing holding portion 18B has a tooth profile that is narrowed toward the bearing housing.

かくして、ラジアルダンパ18の環状部18Aをフラン
ジ部7の軸孔7A周縁部に心を合わせて精度よく嵌着さ
せると共に、軸受箱保持部18Bの先端部を補助軸受箱
15の端部に形成したつば部15Aの周面に接触させ、
軸受箱保持部18Bの有する弾性により軸受箱15をフ
ランジ部7に弾性支持させることができる。
In this way, the annular portion 18A of the radial damper 18 is aligned with the peripheral edge of the shaft hole 7A of the flange portion 7 and fitted with high accuracy, and the tip of the bearing box holding portion 18B is formed at the end of the auxiliary bearing box 15. in contact with the circumferential surface of the flange portion 15A,
The bearing housing 15 can be elastically supported by the flange portion 7 due to the elasticity of the bearing housing holding portion 18B.

更にまた、軸受箱15が回転!i[l12と共に回転し
てしまわないようにするために、軸受箱15の大つば部
15Bには複数のばか孔15Cが設けられており、補助
軸受支持台17をフランジ7に固定する取付けねじ20
をばか孔15Cに遊嵌させることにより軸受箱15の軸
方向の微動のみが許容される。21は軸受箱15の大つ
ば部15Bとフランジ部7の外面との間に介装されるシ
ム部材であり、例えばテフロン等を成形して、波形の溝
を刻設することにより軸受箱15のスラスト方向の微移
動に対して緩衝効果を得ることができる。
Furthermore, the bearing box 15 rotates! In order to prevent the bearing box 15 from rotating together with the flange 7, a plurality of holes 15C are provided in the large flange 15B of the bearing box 15.
By loosely fitting the bearing box 15 into the hole 15C, only slight movement of the bearing box 15 in the axial direction is allowed. Reference numeral 21 denotes a shim member interposed between the large brim portion 15B of the bearing box 15 and the outer surface of the flange portion 7. For example, the shim member 21 is made of Teflon or the like and is engraved with wave-shaped grooves. A buffering effect can be obtained against slight movement in the thrust direction.

なお、以上の説明により全体的な構成について述べてき
たが、ラジアルダンパ18のくし歯状となした軸受箱保
持部18Bを形成するにあたっては、その歯の先端部の
内外を適切に薄くなるよう切・削することにより任意の
強さのばね性を保たせることが可能である。また、補助
軸受14が摩耗し、取換えを要する場合は、取付けねじ
20を取外すだけでカートリッジ型とした軸受箱15を
予備のものと交換することができ、極めて、便利である
Although the overall structure has been described above, when forming the comb-shaped bearing box holding portion 18B of the radial damper 18, it is necessary to make the inside and outside of the tips of the teeth appropriately thin. By cutting and cutting, it is possible to maintain a desired level of springiness. Further, when the auxiliary bearing 14 becomes worn and needs to be replaced, the cartridge-shaped bearing box 15 can be replaced with a spare one by simply removing the mounting screw 20, which is extremely convenient.

ついで、このように構成した1@h制御型磁気軸受装置
の動作について説明する。まず始動にあたっでは、位置
センサ13を介しての制御により、スラスト荷重 転軸2を浮揚させた状態に保ち、ついでモータ1を駆動
回転させるが、その際磁気的吸引力により軸2がラジア
ル方向に引付けられよりとする。
Next, the operation of the 1@h control type magnetic bearing device configured as described above will be explained. First, when starting, the thrust load rotating shaft 2 is kept in a floating state by control via the position sensor 13, and then the motor 1 is driven and rotated. I am attracted to it.

しかし、補助軸受装置が、ばね力によって軸2を正しい
中心釉線上に保っているので、上述の吸引力に打勝って
そのままの状態を支持することができ、更にはシム21
の潤滑効果によって円滑な起動を達成することができる
However, since the auxiliary bearing device maintains the shaft 2 on the correct center glaze line by the spring force, it is possible to overcome the above-mentioned suction force and support the shaft 2 as it is, and furthermore, the shim 2
Smooth start-up can be achieved due to the lubrication effect of

次に回転数が上昇し、共振周波数に達すると、回転軸2
は大きく振動しようとする゛が、このような振動もまた
、補助軸受装置を設けたことによって、抑制されるので
かかる共振域を乗越えて高速回転を実施することができ
る。
Next, when the rotation speed increases and reaches the resonant frequency, the rotating shaft 2
However, such vibrations are also suppressed by providing the auxiliary bearing device, making it possible to overcome the resonance region and perform high-speed rotation.

また、停電等により磁気軸受の機能が停止されたり外乱
によって激しい振動が発生したりすることがあっても、
補助軸受装置がかかる振動を抑制し、また同時にスラス
ト荷重を分担するので、モータの回転に支障をきたすよ
うなことがない。
In addition, even if the magnetic bearing function is stopped due to a power outage or other disturbances cause severe vibration,
Since the auxiliary bearing device suppresses such vibrations and at the same time shares the thrust load, there is no problem in the rotation of the motor.

なお、以上の説明では本発明を高周波モータに適用した
場合について述べそきたが、本発明の適用はこれに限ら
れるものではなく、この種の高速回転体を有する機器に
広く適用できることはいうまでもない。
In the above explanation, the present invention has been applied to a high-frequency motor, but the present invention is not limited to this, and it goes without saying that the present invention can be widely applied to devices having high-speed rotating bodies of this type. Nor.

〔発明の効果〕〔Effect of the invention〕

以上説明してきたように、本発明によれば、弾性支持さ
れる補助軸受装置を設けたことによって高速回転体の回
転軸を軽量かつ短くシンプルな構造とすることカーでき
、多軸制御型の磁気軸受とした場合に比べて軸長を半減
させることが可能となり、コストを著しく低減させるこ
とが可能となった。
As explained above, according to the present invention, by providing an elastically supported auxiliary bearing device, the rotating shaft of a high-speed rotating body can be made lightweight, short and simple in structure, and a multi-axis controlled magnetic Compared to a bearing, the shaft length can be halved, making it possible to significantly reduce costs.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明1軸制御型磁気軸受装置の構成の一例を
示す断面図、 第2図はその磁気軸受装置に設けた補助軸受装置の構成
の一例を示す断面図、 第3図は第2図に示す補助軸受装置の一部を分解して示
すS、′1視図、 第4図は多軸制御型磁気(’+b受装置の構成の一例を
示す断面図である。 1・・・モータ、 2・・・回転軸、 2A・・・大径部、 2B・・・テーパ部、 2C・・・細径部、 6・・・ケーシング、 7・・・フランジ部、 7A・・・軸孔、 11・・・スラスト板、 12・・・電磁石、 13・・・位置センサ、 14・・・補助軸受、 15・・・軸受箱、 15A・・・つば部、 15B・・・大つば部、 15C・・・ばか孔、 16・・・弾性体、 17・・・軸受支持台、 18・・・ラジアルダンノゼ、 18A・・・環状部、 18B・・・軸受箱保持部、 20・・・取付けねじ、 21−・・シム部材。 指定代理人 工業技術院電子技術総合研究所長第1図
FIG. 1 is a sectional view showing an example of the configuration of a single-axis control type magnetic bearing device according to the present invention, FIG. 2 is a sectional view showing an example of the configuration of an auxiliary bearing device provided in the magnetic bearing device, and FIG. Fig. 2 is an exploded view of a part of the auxiliary bearing device, and Fig. 4 is a sectional view showing an example of the configuration of a multi-axis controlled magnetic ('+b) bearing device. 1.・Motor, 2...Rotating shaft, 2A...Large diameter part, 2B...Tapered part, 2C...Small diameter part, 6...Casing, 7...Flange part, 7A... Shaft hole, 11...Thrust plate, 12...Electromagnet, 13...Position sensor, 14...Auxiliary bearing, 15...Bearing box, 15A...Brim portion, 15B...Large brim Part, 15C... Dull hole, 16... Elastic body, 17... Bearing support base, 18... Radial Danose, 18A... Annular part, 18B... Bearing box holding part, 20. ...Mounting screw, 21-...Shim member. Designated agent Director, Electronics Technology Research Institute, Agency of Industrial Science and Technology Figure 1

Claims (1)

【特許請求の範囲】 回転体に設けたスラスト板と該スラスト板の対向位置に
配設された磁石とにより前記回転体の回転軸をスラスト
方向およびラジアル方向に対して浮揚状態に保つ1軸制
御型磁気軸受装置において、 スラストラジアルコンバインド型軸受を有する軸受箱と
、該軸受箱を前記スラスト方向およびラジアル方向に弾
性支持する部材とからなる補助軸受を前記回転軸の両端
部に設けたことを特徴とする1軸制御型磁気軸受装置。
[Scope of Claims] Single-axis control that maintains the rotating shaft of the rotating body in a floating state with respect to the thrust direction and the radial direction by a thrust plate provided on the rotating body and a magnet placed opposite the thrust plate. type magnetic bearing device, characterized in that auxiliary bearings consisting of a bearing box having a thrust-radial combined type bearing and a member that elastically supports the bearing box in the thrust direction and the radial direction are provided at both ends of the rotating shaft. A single-axis controlled magnetic bearing device.
JP30344786A 1986-12-19 1986-12-19 Uniaxial control type magnetic bearing device Pending JPS63157641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30344786A JPS63157641A (en) 1986-12-19 1986-12-19 Uniaxial control type magnetic bearing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30344786A JPS63157641A (en) 1986-12-19 1986-12-19 Uniaxial control type magnetic bearing device

Publications (1)

Publication Number Publication Date
JPS63157641A true JPS63157641A (en) 1988-06-30

Family

ID=17921103

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30344786A Pending JPS63157641A (en) 1986-12-19 1986-12-19 Uniaxial control type magnetic bearing device

Country Status (1)

Country Link
JP (1) JPS63157641A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02280646A (en) * 1989-04-20 1990-11-16 Toshiba Corp Magnetic bearing type electric rotary machine
JPH0434853U (en) * 1990-07-16 1992-03-24
CN110107594A (en) * 2019-04-22 2019-08-09 江苏大学 A kind of electromagnetic bearing twin-screw hydraulic turbine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58190250A (en) * 1982-04-29 1983-11-07 Mitsubishi Electric Corp Underwater motor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58190250A (en) * 1982-04-29 1983-11-07 Mitsubishi Electric Corp Underwater motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02280646A (en) * 1989-04-20 1990-11-16 Toshiba Corp Magnetic bearing type electric rotary machine
JPH0434853U (en) * 1990-07-16 1992-03-24
CN110107594A (en) * 2019-04-22 2019-08-09 江苏大学 A kind of electromagnetic bearing twin-screw hydraulic turbine

Similar Documents

Publication Publication Date Title
JPH03128650A (en) Spindle motor
JPS58142025A (en) Spindle device
JPS63157641A (en) Uniaxial control type magnetic bearing device
JP2975628B2 (en) Gas bearing structure
JPS59188351A (en) Dynamic pressure type bearing motor
JPH10318254A (en) Pre-load giving device for bearing
JP2632305B2 (en) Motor spindle
JPH03272317A (en) Gas bearing structure
JPS60252820A (en) Journal bearing device
JPH102329A (en) Bearing device
JPH0716569U (en) Outer rotor type motor
JPH0735139A (en) Superconductive magnetic bearing unit
KR100207987B1 (en) Hemispherical bearing system using magnetic material
JPH11187617A (en) Concentric biaxial simultaneous rotation device means
JPH0327747A (en) Rotational driving gear for polygon mirror
JPH0623021U (en) Rotating body support device for polygon mirror
JP2001157407A (en) Small-sized motor provided with helicoidal pre-load adjusting mechanism
JPH09329137A (en) Ball bearing device
JPH0757079B2 (en) Spindle motor
JPH03128649A (en) Spindle motor
JPH03159537A (en) Rotor and bearing structure therefor
JPS60261996A (en) On-vehicle wind generator
JPS649664B2 (en)
JPS62279560A (en) Disk driving device
JPH07236252A (en) Dynamic-pressure bearing turning gear