JP3192207B2 - Magnetic bearing - Google Patents
Magnetic bearingInfo
- Publication number
- JP3192207B2 JP3192207B2 JP09779392A JP9779392A JP3192207B2 JP 3192207 B2 JP3192207 B2 JP 3192207B2 JP 09779392 A JP09779392 A JP 09779392A JP 9779392 A JP9779392 A JP 9779392A JP 3192207 B2 JP3192207 B2 JP 3192207B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- bearing
- shaft
- field applying
- applying means
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- F16C32/0436—Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part
- F16C32/0438—Passive magnetic bearings with a conductor on one part movable with respect to a magnetic field, e.g. a body of copper on one part and a permanent magnet on the other part with a superconducting body, e.g. a body made of high temperature superconducting material such as YBaCuO
-
- 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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/40—Application independent of particular apparatuses related to environment, i.e. operating conditions
- F16C2300/62—Application independent of particular apparatuses related to environment, i.e. operating conditions low pressure, e.g. elements operating under vacuum conditions
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軸に固着された永久磁
石製の磁場印加手段から超電導体製の軸受体に磁場を印
加して、前記磁場印加手段と軸受体との間に働く斥力に
よって軸を支持する磁気軸受に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repulsive force acting between a magnetic field applying means and a bearing by applying a magnetic field to a superconductor bearing from a magnetic field applying means made of a permanent magnet fixed to a shaft. And a magnetic bearing for supporting the shaft.
【０００２】[0002]
【従来の技術】軸受の技術は、接触式のものと非接触式
のものとに大別することができる。前者の接触式のもの
としては、例えば、ころを介して軸を支持するころ軸受
等が旧知であり、後者の非接触式のものとしては、空気
圧を利用するものや、磁力を利用するものが知られてい
る。2. Description of the Related Art The technology of bearings can be broadly classified into contact type and non-contact type. As the former contact type, for example, a roller bearing that supports a shaft through a roller is an old knowledge, and as the latter non-contact type, a type using air pressure or a type using magnetic force are used. Are known.
【０００３】磁力を利用する軸受としては、電磁石を使
用するものの他に、最近では、永久磁石と超電導体とを
組合わせて使用する磁気軸受も研究されている。非接触
式の軸受は、いずれも、機械的な接触による摩耗がない
という利点がある。しかし、電磁石を使用するものは、
コイルの発熱によってガスを発生するという難点があ
り、そのために、空気圧を利用するものと同様に、真空
環境で使用するには困難がある。[0003] As bearings utilizing magnetic force, in addition to those using electromagnets, recently, magnetic bearings using a combination of a permanent magnet and a superconductor have been studied. Each of the non-contact type bearings has an advantage that there is no wear due to mechanical contact. However, those using electromagnets
There is a drawback in that gas is generated by the heat generated by the coil, and therefore, there is a difficulty in using it in a vacuum environment as in the case of using air pressure.
【０００４】これに対して、永久磁石と超電導体とを組
合わせて使用する磁気軸受は、電磁石を使用するものと
は異なり、コイルの発熱によるガスの発生といった問題
がなく、真空環境での使用にも適するため、最近では、
実用化に向けて、盛んに研究がなされるようになってき
た。[0004] On the other hand, a magnetic bearing using a combination of a permanent magnet and a superconductor is different from the one using an electromagnet in that there is no problem such as generation of gas due to heat generation of a coil, and use in a vacuum environment. In recent years,
Research has been actively pursued for practical use.
【０００５】[0005]
【発明が解決しようとする課題】ところで、これまで、
永久磁石と超電導体とを組合わせて使用する磁気軸受と
しては、超電導体に磁場を印加するために支持対象の軸
上に固着された永久磁石製の磁場印加手段と、この磁場
印加手段に対峙するように前記軸が挿通する軸受箱内に
配備された超電導体製の軸受体と、この軸受体を冷却し
て超電導状態にする冷却手段とを備え、超電導状態にあ
る前記軸受体とこの軸受体に対峙する磁場印加手段との
間に働く斥力によって前記軸を支持する構成のものが研
究されてきた。By the way, until now,
As a magnetic bearing using a combination of a permanent magnet and a superconductor, a magnetic field applying unit made of a permanent magnet fixed on a shaft to be supported to apply a magnetic field to the superconductor, and facing the magnetic field applying unit A bearing member made of a superconductor disposed in a bearing box through which the shaft is inserted, and cooling means for cooling the bearing member to a superconducting state, wherein the bearing member and the bearing in the superconducting state are provided. A structure in which the shaft is supported by a repulsive force acting between the magnetic field applying means facing the body has been studied.
【０００６】ところが、超電導体は、常電導状態から超
電導状態に移行させるための冷却処理時に磁場が印加さ
れていると、その時に印加されている磁場と同方向に磁
化されるという性質がある。However, when a magnetic field is applied during a cooling process for shifting from a normal conducting state to a superconducting state, the superconductor has a property of being magnetized in the same direction as the magnetic field applied at that time.
【０００７】そのため、前述の構成の磁気軸受におい
て、軸受体に磁場印加手段が近接した状態で軸受体の冷
却処理を実行すると、冷却処理後の軸受体は、磁場印加
手段が作用させる磁場と同方向に磁化された状態になっ
て、結局、軸受体と磁場印加手段との間に所望の斥力が
得られなくなり、非接触の軸受としての機能が果たせな
くなるという問題が生じる。Therefore, in the magnetic bearing having the above-described configuration, when the cooling process of the bearing body is executed in a state where the magnetic field applying means is close to the bearing body, the bearing body after the cooling process has the same magnetic field as the magnetic field applied by the magnetic field applying means. As a result, a desired repulsive force cannot be obtained between the bearing body and the magnetic field applying means, and the function as a non-contact bearing cannot be achieved.
【０００８】従って、超電導体を利用した磁気軸受の実
用化には、軸受体が不利に磁化されないように、軸受体
を常電導状態から超電導状態に冷却する技術の開発が不
可欠となり、この点が今後の課題とされていた。Therefore, in order to put a magnetic bearing using a superconductor into practical use, it is essential to develop a technology for cooling the bearing body from a normal conducting state to a superconducting state so that the bearing body is not disadvantageously magnetized. It was a future issue.
【０００９】本発明は、前記事情に鑑みてなされたもの
で、超電導体製の軸受体を常電導状態から超電導状態に
冷却処理する期間に該軸受体が磁場印加手段の影響で不
利に磁化されてしまうことがなく、したがって、超電導
状態にある軸受体と該軸受体に対峙する磁場印加手段と
の間には所望の斥力を得ることができて、非接触の軸受
としての実用化値の高い磁気軸受を提供することを目的
とする。The present invention has been made in view of the above circumstances, and during the period in which a superconductor bearing body is cooled from a normal conducting state to a superconducting state, the bearing body is disadvantageously magnetized by the influence of the magnetic field applying means. Therefore, a desired repulsive force can be obtained between the superconducting bearing body and the magnetic field applying means facing the bearing body, and the value of practical use as a non-contact bearing is high. It is an object to provide a magnetic bearing.
【００１０】[0010]
【課題を解決するための手段】請求項１に記載の磁気軸
受は、超電導体に磁場を印加するために支持対象の軸上
に固着された永久磁石製の磁場印加手段と、この磁場印
加手段に対峙するように前記軸が挿通する軸受箱内に配
備された超電導体製の軸受体と、この軸受体を冷却して
超電導状態にする冷却手段とを備えて、超電導状態にあ
る前記軸受体とこの軸受体に対峙する磁場印加手段との
間に働く斥力によって前記軸を支持するものである。According to a first aspect of the present invention, there is provided a magnetic bearing, comprising: a magnetic field applying means made of a permanent magnet fixed on a shaft to be supported to apply a magnetic field to a superconductor; A bearing member made of a superconductor disposed in a bearing box through which the shaft is inserted so as to face the bearing, and cooling means for cooling the bearing member to a superconducting state, wherein the bearing member in a superconducting state is provided. The shaft is supported by a repulsive force acting between the magnetic field applying means facing the bearing body.
【００１１】具体的には、前記軸受体を常電導状態から
超電導状態に移行させるための前記冷却手段による冷却
処理期間には前記軸を軸線方向に移動操作して、超電導
状態の時に磁場印加手段との間に所定の斥力を生ぜしめ
るために印加する磁場が前記軸受体に作用することを防
止する軸移動手段を装備したことを特徴とする。More specifically, during the cooling process by the cooling means for shifting the bearing body from the normal conducting state to the superconducting state, the shaft is moved in the axial direction during the cooling process, and the magnetic field applying means is operated in the superconducting state. And a shaft moving means for preventing a magnetic field applied to generate a predetermined repulsive force between the bearing member and the bearing member from acting on the bearing body.
【００１２】請求項２に記載の磁気軸受は、請求項１に
記載の磁気軸受を改善したもので、支持対象の軸には、
前記磁場印加手段が軸の軸線方向に沿って複数箇所に装
備される。A magnetic bearing according to a second aspect is an improvement of the magnetic bearing according to the first aspect.
The magnetic field applying means is provided at a plurality of locations along the axial direction of the shaft.
【００１３】そして、前記軸移動手段は、前記軸受体を
常電導状態から超電導状態に移行させるための前記冷却
手段による冷却処理期間に、超電導状態のときに印加す
べき磁場と逆向きの磁場が作用するように、軸受体に近
接する磁場印加手段を軸の移動によって切り換える。[0013] The shaft moving means may include a magnetic field in a direction opposite to a magnetic field to be applied in the superconducting state during a cooling process by the cooling means for shifting the bearing body from the normal conducting state to the superconducting state. In order to operate, the magnetic field applying means close to the bearing body is switched by moving the shaft.
【００１４】[0014]
【作用】請求項１に記載の磁気軸受では、常電導状態か
ら超電導状態に移行させるための冷却処理期間には、磁
場印加手段が対応する軸受体から離間された状態に保持
されて、超電導状態の時に磁場印加手段との間に所定の
斥力を生ぜしめるために印加する磁場が冷却処理時に作
用することが防止される。In the magnetic bearing according to the first aspect, during the cooling processing period for shifting from the normal conducting state to the superconducting state, the magnetic field applying means is maintained in a state separated from the corresponding bearing body, and the superconducting state is maintained. In this case, the magnetic field applied to generate a predetermined repulsion between the magnetic field applying means and the magnetic field applying means is prevented from acting during the cooling process.
【００１５】従って、互いに対峙する軸受体と磁場印加
手段との間に得るべき磁気反力が、軸受体を常電導状態
から超電導状態に移行させるための冷却処理によって弱
められてしまうことがなく、軸受体とこれに対峙した磁
場印加手段との間に働く斥力によって軸を非接触状態で
支持することが可能になり、真空環境での使用に適した
磁気軸受の実用化が可能になる。Accordingly, the magnetic reaction force to be obtained between the bearing body and the magnetic field applying means facing each other is not weakened by the cooling process for shifting the bearing body from the normal conducting state to the superconducting state. The shaft can be supported in a non-contact state by a repulsive force acting between the bearing body and the magnetic field applying means facing the bearing body, so that a magnetic bearing suitable for use in a vacuum environment can be put to practical use.
【００１６】請求項２に記載の磁気軸受では、常電導状
態から超電導状態に移行させるための冷却処理期間に
は、磁場印加手段が対応する軸受体の基準の位置からず
れることによって、超電導状態の時に磁場印加手段との
間に所定の斥力を生ぜしめるために印加される磁場とは
逆向きの磁場が冷却処理時に作用し、冷却処理時の印加
磁場による磁化作用によって、冷却処理後の軸受体と磁
場印加手段とは、互いに同じ極性の磁極同士が対峙する
結果となり、これによって、互いに対峙する軸受体と磁
場印加手段との間に得るべき磁気反力が、強められる。In the magnetic bearing according to the second aspect, during the cooling process period for shifting from the normal conducting state to the superconducting state, the magnetic field applying means is shifted from the reference position of the corresponding bearing body, so that the superconducting state is changed. At the time, a magnetic field opposite to the magnetic field applied to generate a predetermined repulsive force between the magnetic field applying means and the magnetic field applying means acts at the time of cooling processing, and the magnetizing action by the applied magnetic field at the time of cooling processing causes the bearing body after the cooling processing As a result, the magnetic poles having the same polarity face each other, and the magnetic reaction force to be obtained between the bearing body and the magnetic field applying means facing each other is strengthened.
【００１７】従って、軸受体とこれに対峙した磁場印加
手段との間に働く斥力によって軸を非接触状態で支持す
ることが可能になり、真空環境での使用に適した磁気軸
受の実用化が可能になる。Therefore, the shaft can be supported in a non-contact state by the repulsive force acting between the bearing body and the magnetic field applying means facing the bearing body, so that a magnetic bearing suitable for use in a vacuum environment can be practically used. Will be possible.
【００１８】[0018]
【実施例】図１は、本発明に係る磁気軸受の一実施例の
構成を示したものである。この一実施例の磁気軸受は、
超電導体に磁場を印加するために支持対象の軸１上に固
着された２つの永久磁石製の磁場印加手段２，３と、こ
の磁場印加手段２，３に対峙するように前記軸１が挿通
する軸受箱４内に配備された超電導体製の軸受体５，６
と、これらの軸受体５，６を冷却して超電導状態にする
冷却手段（図示略）と、この冷却手段によって前記軸受
体５，６を常電導状態から超電導状態に移行させる冷却
処理期間に前記軸１を軸線方向に移動操作する軸移動手
段８とを具備した構成で、超電導状態にある前記軸受体
５，６とこれらの軸受体に対峙する磁場印加手段２，３
との間に働く斥力によって前記軸１を支持する。FIG. 1 shows the configuration of an embodiment of a magnetic bearing according to the present invention. The magnetic bearing of this embodiment is
Two permanent magnet-made magnetic field applying means 2 and 3 fixed on a shaft 1 to be supported to apply a magnetic field to the superconductor, and the shaft 1 is inserted so as to face the magnetic field applying means 2 and 3. Bearing bodies 5 and 6 disposed in bearing housing 4
A cooling means (not shown) for cooling these bearing bodies 5 and 6 to a superconducting state, and the cooling means for cooling the bearing bodies 5 and 6 from a normal conducting state to a superconducting state by the cooling means. A shaft moving means 8 for moving the shaft 1 in the axial direction, the bearings 5 and 6 being in a superconducting state, and magnetic field applying means 2 and 3 facing these bearings.
The shaft 1 is supported by a repulsive force acting between the shaft 1 and the shaft 1.
【００１９】前記軸１は非磁性体で形成された中実の丸
軸で、一実施例の磁気軸受は前記軸１に対するスラスト
軸受として機能するものである。以下、一実施例の各構
成要素について詳述する。The shaft 1 is a solid round shaft formed of a non-magnetic material, and the magnetic bearing of one embodiment functions as a thrust bearing for the shaft 1. Hereinafter, each component of the embodiment will be described in detail.
【００２０】前記磁場印加手段２，３は、それぞれ軸１
の軸線方向に離間して装備されている。磁場印加手段２
は、２つのリング状の永久磁石２１，２２を組合わせた
構成である。そして、内側の磁石２１では、図１で上側
がＮ極，下側がＳ極に設定されている。また、外側の磁
石２２では、図１で上側がＳ極，下側がＮ極に設定され
ている。The magnetic field applying means 2 and 3 each have a shaft 1
Are spaced apart in the axial direction. Magnetic field applying means 2
Is a configuration in which two ring-shaped permanent magnets 21 and 22 are combined. In the inner magnet 21, the upper side is set to the N pole and the lower side is set to the S pole in FIG. In the outer magnet 22, the upper side is set to the S pole and the lower side is set to the N pole in FIG.
【００２１】磁場印加手段３は、３つのリング状の永久
磁石３１，３２，３３を組合わせた構成である。そし
て、一番内側の磁石３１の外径は磁場印加手段２におけ
る磁石２１と等しくされ、中間の磁石３２の外径は磁場
印加手段２における磁石２２と等しくされている。しか
し、磁石３１の極性は、磁石２１とは逆で、図１で上側
がＳ極，下側がＮ極に設定されている。また、磁石３２
の極性は、磁石２２とは逆で、図１で上側がＮ極，下側
がＳ極に設定されている。また、磁石３３の極性は、図
１で上側がＳ極，下側がＮ極に設定されている。The magnetic field applying means 3 has a configuration in which three ring-shaped permanent magnets 31, 32, and 33 are combined. The outer diameter of the innermost magnet 31 is made equal to the magnet 21 in the magnetic field applying means 2, and the outer diameter of the middle magnet 32 is made equal to the magnet 22 in the magnetic field applying means 2. However, the polarity of the magnet 31 is opposite to that of the magnet 21, and the upper side in FIG. 1 is set to the S pole and the lower side to the N pole. Also, the magnet 32
Is opposite to that of the magnet 22, and the upper side is set to the N pole and the lower side is set to the S pole in FIG. In addition, the polarity of the magnet 33 is set to the S pole on the upper side and the N pole on the lower side in FIG.
【００２２】これらの磁場印加手段２，３に使用する永
久磁石は、Ｎｄ−Ｆｅ−Ｂ系のもので、これらの磁場印
加手段２，３によって印加する磁場は、各磁場印加手段
２，３の表面部で３．７ｋＧ（ガウス）である。The permanent magnets used for these magnetic field applying means 2 and 3 are of the Nd--Fe--B type, and the magnetic field applied by these magnetic field applying means 2 and 3 is It is 3.7 kG (Gauss) at the surface.
【００２３】前記軸受箱４は、前記軸受体５，６を固定
支持する支持枠であり、内径Ｄ0 ＝１００ｍｍ，軸線方
向の長さＬ0 ＝１５０ｍｍの非磁性体製の円筒体であ
る。The bearing box 4 is a support frame for fixing and supporting the bearing bodies 5 and 6, and is a cylindrical body made of a non-magnetic material having an inner diameter D 0 = 100 mm and a length L 0 = 150 mm in the axial direction.
【００２４】前記軸受体５，６は、Ｙ1.8 Ｂａ2.4 Ｃｕ
3.4 Ｏx 組成の粉を、まず、５ｉｎｃｈの金型を使って
面圧１００トンで成型して直径が５インチで厚さが２０
ｍｍの円盤状の素材に形成し、この素材を所定の熱処理
後に、所定の切削加工を行うことによって、所望の寸法
形状にした。The bearing members 5 and 6 are made of Y 1.8 Ba 2.4 Cu
3.4 flour O x composition, first, the diameter and molded at a surface pressure of 100 tons with a mold 5inch is thick at 5 inches 20
mm was formed into a disk-shaped material, and the material was subjected to a predetermined heat treatment after a predetermined heat treatment to obtain a desired size and shape.
【００２５】前記素材に行った熱処理は、まず、１１０
０℃で３０分保持した後、１０００℃から９３０℃まで
１℃／hourの温度勾配で冷却し、さらに、７００℃から
３００℃までは２００時間かけて徐冷するものである。The heat treatment performed on the material was first performed at 110
After holding at 0 ° C. for 30 minutes, the temperature is cooled from 1000 ° C. to 930 ° C. at a temperature gradient of 1 ° C./hour, and then gradually cooled from 700 ° C. to 300 ° C. over 200 hours.
【００２６】以上の熱処理後の素材に対して、切削加工
を行い、軸受体５は、外径が１００ｍｍ、板厚Ｔ1 ＝２
０ｍｍの円盤状で、中央部には、軸１を挿通するための
孔５１と、磁場印加手段２を近接させるための座ぐり部
５２とを備えた構造とした。孔５１は直径Ｄ1 ＝２０ｍ
ｍで、座ぐり部５２は、直径Ｄ2 ＝５０ｍｍ、深さＬ1
＝１０ｍｍである。The material after the above heat treatment is subjected to cutting, and the bearing 5 has an outer diameter of 100 mm and a thickness T 1 = 2.
It has a disk shape of 0 mm, and has a structure provided with a hole 51 for inserting the shaft 1 and a counterbore 52 for bringing the magnetic field applying means 2 close to each other in the center. The hole 51 has a diameter D 1 = 20 m
m, the counterbore 52 has a diameter D 2 = 50 mm and a depth L 1
= 10 mm.
【００２７】軸受体６は、外径が１００ｍｍ、板厚Ｔ2
＝２０ｍｍの円盤状で、中央部には、磁場印加手段３を
近接させるための座ぐり部６１を備えた構造とした。座
ぐり部６１は、直径Ｄ3 ＝７０ｍｍで、深さＬ2 ＝１０
ｍｍである。The bearing 6 has an outer diameter of 100 mm and a thickness T 2.
= 20 mm disk-shaped and provided with a counterbore 61 in the center for bringing the magnetic field applying means 3 close to it. The spot facing portion 61 has a diameter D 3 = 70 mm and a depth L 2 = 10.
mm.
【００２８】これらの軸受体５，６の材料特性は、２ｍ
ｍ角の試料として切り出して評価した結果、最大磁化が
１５００Ｇ（ガウス）であった。The material properties of these bearing bodies 5 and 6 are 2 m
As a result of cutting out and evaluating a sample of m-square, the maximum magnetization was 1500 G (Gauss).
【００２９】前記冷却手段は、図示はしていないが、液
体窒素を使ったガス冷却によって、前記軸受体５，６を
超電導状態まで冷却するものである。Although not shown, the cooling means cools the bearing members 5 and 6 to a superconductive state by gas cooling using liquid nitrogen.
【００３０】前記軸移動手段８は、詳細な構造は示して
いないが、前記軸１を把持する軸把持部８１と、該軸把
持部８１を軸１の軸線方向に進退操作する直線移動制御
装置８２とから構成されている。これらの軸把持部８１
および直線移動制御装置８２は、いずれも、公知の機構
を流用したものでよい。Although the detailed structure of the shaft moving means 8 is not shown, a shaft holding portion 81 for holding the shaft 1 and a linear movement control device for operating the shaft holding portion 81 in the axial direction of the shaft 1. 82. These shaft grips 81
The linear movement control device 82 may use a known mechanism.
【００３１】一実施例の軸移動手段８は、前記軸受体
５，６を常電導状態から超電導状態に移行させるための
冷却手段による冷却処理期間には、図２に示すように、
軸１を図１上で上方側に引き上げて、それぞれの磁場印
加手段２，３を対応する軸受体５，６から離間させる。
また、この一実施例の場合には、軸受体６に対する磁場
印加手段３を軸受体５に近接させた状態にする。As shown in FIG. 2, the shaft moving means 8 according to one embodiment, during the cooling process by the cooling means for shifting the bearing bodies 5 and 6 from the normal conducting state to the superconducting state,
The shaft 1 is pulled upward in FIG. 1 to separate the respective magnetic field applying means 2 and 3 from the corresponding bearing bodies 5 and 6.
Further, in the case of this embodiment, the magnetic field applying means 3 for the bearing body 6 is brought into a state close to the bearing body 5.
【００３２】そして、軸受体５，６を常電導状態から超
電導状態に移行させるための冷却手段による冷却処理期
間が終了したら、軸移動手段８は、再び、軸１を引き下
げて、軸受体５には磁場印加手段２が接近して対峙し、
軸受体６には磁場印加手段３が接近して対峙する、通常
の使用時の状態に戻す。When the cooling period for cooling the bearing members 5 and 6 from the normal conducting state to the superconducting state by the cooling means is completed, the shaft moving means 8 lowers the shaft 1 again, and Means that the magnetic field applying means 2 approaches and confronts,
The magnetic field applying means 3 approaches the bearing body 6 and returns to a state of normal use in which the magnetic field applying means 3 faces the bearing body 6.
【００３３】ところで、前述したように、超電導体は、
常電導状態から超電導状態に移行させるための冷却処理
時に磁場が印加されていると、その時に印加されている
磁場と同方向に磁化されるという性質があるが、一実施
例の磁気軸受では、常電導状態から超電導状態に移行さ
せるための冷却処理期間は、前記軸移動手段８による移
動操作によって、各磁場印加手段２，３をそれぞれの対
応する軸受体５，６から離間させた状態にする。そし
て、軸受体５においては、超電導状態のときに対峙する
磁場印加手段とは極性が逆向きの磁場印加手段３が近接
した状態で冷却が遂行され、また、軸受体６において
は、いずれの磁場印加手段も近接しない状態で冷却が遂
行される。Incidentally, as described above, the superconductor is:
When a magnetic field is applied during the cooling process for shifting from the normal conducting state to the superconducting state, there is a property of being magnetized in the same direction as the magnetic field applied at that time, but in the magnetic bearing of one embodiment, During the cooling process period for shifting from the normal conducting state to the superconducting state, the magnetic field applying means 2 and 3 are separated from the corresponding bearing bodies 5 and 6 by the moving operation by the shaft moving means 8. . In the bearing 5, cooling is performed in a state in which the magnetic field applying means 3 having a polarity opposite to that of the magnetic field applying means facing in the superconducting state is close to the magnetic field applying means. Cooling is performed in a state where the application means is not in close proximity.
【００３４】即ち、何れの軸受体５，６においても、超
電導状態の時に磁場印加手段２，３との間に所定の斥力
を生ぜしめるために印加する磁場が冷却処理時に作用す
ることが防止され、前記軸受体５は、磁場印加手段３に
よる磁場が印加された状態で冷却されることによって、
超電導状態では図２に示したように、磁場印加手段３に
よる磁場と同方向に磁化された状態になる。また、軸受
体６は、磁場が印加されていない状態で冷却されること
によって、磁化されずに超電導状態になる。That is, in any of the bearing bodies 5 and 6, the magnetic field applied to generate a predetermined repulsive force between the bearing bodies 5 and 6 in the superconducting state is prevented from acting during the cooling process. The bearing body 5 is cooled in a state where a magnetic field is applied by the magnetic field applying means 3,
In the superconducting state, as shown in FIG. 2, it is magnetized in the same direction as the magnetic field by the magnetic field applying means 3. In addition, the bearing body 6 is cooled in a state where no magnetic field is applied, so that the bearing body 6 is not magnetized and enters a superconducting state.
【００３５】そして、軸受体５，６を常電導状態から超
電導状態に移行させる冷却処理が終了して、軸移動手段
８によって軸１を元の状態に戻すと、前記軸受体５と磁
場印加手段２とは、冷却処理時における軸受体５の磁化
によって、同じ極性の磁極同士が接近することになり、
軸受体５と磁場印加手段２と間には、大きな斥力が発生
することになる。また、軸受体６は、磁場印加手段３に
よって印加される磁場によって新たに印加磁場と逆方向
に磁化され、その結果、軸受体６と磁場印加手段３との
間に所定の斥力が生じることになる。After the cooling process for shifting the bearing members 5 and 6 from the normal conducting state to the superconducting state is completed and the shaft 1 is returned to the original state by the shaft moving means 8, the bearing body 5 and the magnetic field applying means are returned. 2 means that the magnetic poles of the same polarity approach each other due to the magnetization of the bearing body 5 during the cooling process,
A large repulsive force is generated between the bearing body 5 and the magnetic field applying means 2. Further, the bearing body 6 is newly magnetized in the opposite direction to the applied magnetic field by the magnetic field applied by the magnetic field applying means 3, and as a result, a predetermined repulsive force is generated between the bearing body 6 and the magnetic field applying means 3. Become.
【００３６】以上の結果、一実施例の磁気軸受では、互
いに対峙する軸受体と磁場印加手段との間に得るべき磁
気反力が、各軸受体を常電導状態から超電導状態に移行
させるための冷却処理によって弱められてしまうことが
なく、各軸受体５，６とこれらの軸受体に対峙した磁場
印加手段２，３との間に働く斥力によって軸１を非接触
状態で支持することが可能になる。As a result, in the magnetic bearing of one embodiment, the magnetic reaction force to be obtained between the bearing body and the magnetic field applying means facing each other causes the bearing body to shift from the normal conducting state to the superconducting state. The shaft 1 can be supported in a non-contact state by a repulsive force acting between the bearings 5 and 6 and the magnetic field applying means 2 and 3 facing these bearings without being weakened by the cooling process. become.
【００３７】実際の測定結果では、冷却処理時に軸移動
手段８によって各磁場印加手段２，３を対応する軸受体
５，６から離間させた一実施例では、軸受体５，６から
得られる反発力として２５ｋｇが測定されたのに対し
て、磁場印加手段２，３をそれぞれの軸受体５，６に接
近させたままで冷却処理した場合には、軸受体５，６か
ら得られる反発力の最大値は１２ｋｇ程度で、一実施例
の効果が絶大であることが確認された。According to the actual measurement results, in the embodiment in which the magnetic field applying means 2 and 3 are separated from the corresponding bearing bodies 5 and 6 by the shaft moving means 8 during the cooling process, the repulsion obtained from the bearing bodies 5 and 6 is provided. Although 25 kg was measured as the force, when cooling treatment was performed with the magnetic field applying means 2 and 3 approaching the bearings 5 and 6, the maximum repulsive force obtained from the bearings 5 and 6 was obtained. The value was about 12 kg, and it was confirmed that the effect of one example was enormous.
【００３８】図３は、本発明に係る磁気軸受の他の実施
例の構成を示したものである。この他の実施例の磁気軸
受は、超電導体に磁場を印加するために支持対象の軸１
００上に固着された６つの永久磁石製の磁場印加手段１
０１〜１０６と、これらの磁場印加手段１０１〜１０６
に対峙するように前記軸１００が挿通する軸受箱（図示
略）内に配備された超電導体製の軸受体１１０と、この
軸受体１００を冷却して超電導状態にする冷却手段（図
示略）と、この冷却手段によって前記軸受体１１０を常
電導状態から超電導状態に移行させる冷却処理期間に前
記軸１００を軸線方向に移動操作する軸移動手段８とを
具備した構成で、超電導状態にある前記軸受体１１０と
この軸受体１１０に対峙する各磁場印加手段１０１〜１
０６との間に働く斥力によって前記軸１００を支持す
る。FIG. 3 shows the configuration of another embodiment of the magnetic bearing according to the present invention. The magnetic bearing according to the other embodiment has a shaft 1 to be supported for applying a magnetic field to the superconductor.
Magnetic field applying means 1 made of six permanent magnets fixed on 00
01 to 106 and these magnetic field applying means 101 to 106
A bearing body 110 made of a superconductor provided in a bearing box (not shown) through which the shaft 100 is inserted so as to face the shaft 100, and a cooling means (not shown) for cooling the bearing body 100 to a superconductive state. A shaft moving means 8 for moving the shaft 100 in the axial direction during a cooling process in which the bearing body 110 is shifted from a normal conducting state to a superconducting state by the cooling means. Body 110 and each magnetic field applying means 101 to 1 facing this bearing body 110
The shaft 100 is supported by a repulsive force acting between the shaft 100.
【００３９】前記軸１００は非磁性体で形成された直径
１０ｍｍの中実の丸軸で、この他の実施例の磁気軸受は
前記軸１００に対するラジアル軸受として機能するもの
である。以下、一実施例の各構成要素について詳述す
る。The shaft 100 is a solid round shaft formed of a non-magnetic material and having a diameter of 10 mm, and the magnetic bearing of the other embodiment functions as a radial bearing for the shaft 100. Hereinafter, each component of the embodiment will be described in detail.
【００４０】前記磁場印加手段１０１〜１０６は、Ｎｄ
−Ｆｅ−Ｂ系の永久磁石で、何れも同じ寸法のリング状
を呈しており、それぞれ軸１００の軸線方向に隣接して
装備されている。なお、各磁場印加手段の寸法は、内径
Ｄ5 ＝１０ｍｍ、外径Ｄ6 ＝２０ｍｍ、厚さＴ3 ＝８ｍ
ｍである。また、それぞれの磁場印加手段相互間では、
同じ磁極が隣接するように、各磁場印加手段毎に磁極方
向を設定している。例えば、一番上の磁場印加手段１０
１では、上側の磁極がＳで下側の磁極がＮであるのに対
し、二番目の磁場印加手段１０２では、上側の磁極がＮ
で下側の磁極がＳである。The magnetic field applying means 101 to 106 are composed of Nd
-Fe-B-based permanent magnets, each having a ring shape having the same dimensions, and each being provided adjacent to the shaft 100 in the axial direction. The dimensions of each magnetic field applying means are as follows: inner diameter D 5 = 10 mm, outer diameter D 6 = 20 mm, and thickness T 3 = 8 m.
m. In addition, between the respective magnetic field applying means,
The magnetic pole direction is set for each magnetic field applying means so that the same magnetic pole is adjacent. For example, the top magnetic field applying means 10
1, the upper magnetic pole is S and the lower magnetic pole is N, whereas in the second magnetic field applying means 102, the upper magnetic pole is N
And the lower magnetic pole is S.
【００４１】前記軸受体１１０は、外径Ｄ7 ＝５０ｍ
ｍ、内径Ｄ8 ＝２５ｍｍ、長さＬ3 ＝５０ｍｍの円筒体
で、Ｙ1.8 Ｂａ2.4 Ｃｕ3.4 Ｏx 組成の粉を金型を使っ
て所定寸法の円筒体に成型して、その後、一実施例と同
じ手順の熱処理を施したものである。この軸受体１１０
の材料特性は、２ｍｍ角の試料として切り出して評価し
た結果、最大磁化が１５００Ｇ（ガウス）で、一実施例
と同様であった。The bearing body 110 has an outer diameter D 7 = 50 m.
m, an inner diameter D 8 = 25 mm, a length L 3 = 50 mm, and a powder having a composition of Y 1.8 Ba 2.4 Cu 3.4 O x is molded into a cylinder having a predetermined size by using a mold. The heat treatment was performed in the same procedure as in the example. This bearing body 110
As a result of cutting out a 2 mm square sample and evaluating the material characteristics, the maximum magnetization was 1500 G (Gauss), which was the same as that of the example.
【００４２】なお、軸受体１１０と各磁場印加手段１０
１〜１０６との軸線方向の相対位置関係は、図３に示す
ように、軸受体１１０の端面から寸法Ｌ4 ＝１ｍｍだけ
中に入った位置に一番目の磁場印加手段１０１の端面が
くる状態を基準の位置関係としている。The bearing body 110 and each magnetic field applying means 10
As shown in FIG. 3, the relative positional relationship between the first magnetic field applying means 101 and the first magnetic field applying means 101 is located at a position within the dimension L 4 = 1 mm from the end face of the bearing body 110 as shown in FIG. Is the reference positional relationship.
【００４３】前記冷却手段は、一実施例の場合と同様
で、液体窒素を使ったガス冷却によって、前記軸受体１
１０を超電導状態まで冷却する。The cooling means is the same as in the case of the first embodiment.
10 is cooled to a superconducting state.
【００４４】前記軸移動手段８は、一実施例と同じ構成
のものである。ただし、この他の実施例では、軸移動手
段８は、前記軸受体１１０を常電導状態から超電導状態
に移行させるための冷却手段による冷却処理期間には、
図４に示すように、軸１００を図３上で磁場印加手段の
１個分（即ち、寸法Ｔ3 の分）だけ上方側に引き上げ
て、軸受体１１０の内周面に対峙している各磁場印加手
段を基準の位置関係の時よりも１個分ずらした状態にす
る。The shaft moving means 8 has the same structure as in the embodiment. However, in this other embodiment, during the cooling process by the cooling means for shifting the bearing body 110 from the normal conducting state to the superconducting state,
As shown in FIG. 4, the shaft 100 is lifted up by one magnetic field applying means (that is, the dimension T3) in FIG. 3 and each magnetic field facing the inner peripheral surface of the bearing body 110 is raised. The application means is shifted by one from the reference positional relationship.
【００４５】そして、軸受体１１０を常電導状態から超
電導状態に移行させるための冷却手段による冷却処理期
間が終了したら、軸移動手段８は、再び、軸１００を引
き下げて、元の基準の位置関係に戻す。When the cooling process by the cooling means for shifting the bearing body 110 from the normal conduction state to the superconducting state is completed, the shaft moving means 8 lowers the shaft 100 again to return to the original reference positional relationship. Return to
【００４６】このようにすると、軸受体１１０は、基準
の位置関係の時（即ち、超電導状態で使用するとき）に
対峙する磁場印加手段とは極性が逆向きの磁場印加手段
が近接した状態で冷却が遂行されることになり、冷却処
理時における磁化作用によって、前記軸受体１１０は、
冷却処理が終了して超電導状態になった時には、図４に
示したように、基準の位置関係の時に対峙する各磁場印
加手段に対して同じ極性の磁極同士が接近することにな
り、軸受体１１０と各磁場印加手段１０１〜１０５と間
には、冷却処理時の磁化によってより大きな斥力が発生
することになる。なお、基準の位置関係において６番目
の磁場印加手段１０６が対峙する軸受体１１０の位置
は、冷却処理時に磁化されていないため、磁場印加手段
１０６によって印加される磁場によって新たに印加磁場
と逆方向に磁化され、その結果、所定の斥力を生じさせ
ることになる。In this manner, the bearing body 110 is placed in a state in which the magnetic field applying means whose polarity is opposite to that of the magnetic field applying means facing the reference positional relationship (ie, when used in a superconducting state) is close to the bearing body 110. Cooling will be performed, and the bearing body 110 will be
When the cooling process is completed and the superconducting state is established, as shown in FIG. 4, the magnetic poles of the same polarity approach each other to the magnetic field applying means facing each other at the time of the reference positional relationship. A larger repulsive force is generated between 110 and each of the magnetic field applying units 101 to 105 due to the magnetization during the cooling process. Note that the position of the bearing body 110 facing the sixth magnetic field applying means 106 in the reference positional relationship is not magnetized during the cooling process, and thus the magnetic field applied by the magnetic field applying means 106 causes a new direction opposite to the applied magnetic field. As a result, a predetermined repulsive force is generated.
【００４７】以上の結果、図３に示した他の実施例の磁
気軸受でも、互いに対峙する軸受体と磁場印加手段との
間に得るべき磁気反力が、軸受体１１０を常電導状態か
ら超電導状態に移行させるための冷却処理によって弱め
られてしまうことがなく、軸受体１１０とこれに対峙し
た磁場印加手段１０１〜１０６との間に働く斥力によっ
て軸１００を非接触状態で支持することが可能になる。As a result, even in the magnetic bearing of the other embodiment shown in FIG. 3, the magnetic reaction force to be obtained between the bearing body and the magnetic field applying means facing each other changes the bearing body 110 from the normal conducting state to the superconducting state. The shaft 100 can be supported in a non-contact state by a repulsive force acting between the bearing body 110 and the magnetic field applying means 101 to 106 facing the bearing body 110 without being weakened by the cooling process for shifting to the state. become.
【００４８】なお、本発明に係る磁気軸受において、軸
受体に使用する超電導体は、磁場印加手段との間により
大きな斥力を発生することが求められるため、磁場の印
加によって磁化されやすく、またピンニングポテンシャ
ル（磁束線のピン止め効果）の高いものが好ましく、適
正な材料としては、Ｙ系酸化物超電導体やＴl 系酸化物
超電導体などを挙げることができ、また、本願発明者の
研究によれば、Ｙ系およびＴl 系のいずれの酸化物超電
導体においても、結晶粒が大きいほうが特性が良く、部
分溶融法や溶融法を利用して結晶成長を行うことが好ま
しいという結果が判明している。このような研究成果か
ら、前述の実施例では、軸受体に使用する超電導体とし
て、Ｙ1.8 Ｂａ2.4 Ｃｕ3.4 Ｏx 組成の材料を選定した
が、本発明で軸受体に使用する超電導体は、実施例で使
用した酸化物超電導体、あるいは前述のＹ系およびＴl
系の酸化物超電導体に限定するものではない。In the magnetic bearing according to the present invention, the superconductor used for the bearing body is required to generate a larger repulsive force between the superconductor and the magnetic field applying means. A material having a high potential (pinning effect of magnetic flux lines) is preferable, and suitable materials include Y-based oxide superconductors and Tl-based oxide superconductors. For example, it has been found that the larger the crystal grain, the better the characteristics of the oxide superconductors of both Y-based and Tl-based oxides, and that the crystal growth is preferably performed by using a partial melting method or a melting method. . From such findings, in the illustrated embodiment, as a superconductor for use in the bearing body, has been selected Y 1.8 Ba 2.4 Cu 3.4 O x composition of the material, the superconductor used for the bearing member in the present invention, The oxide superconductor used in the examples, or the aforementioned Y-based and Tl
The invention is not limited to the oxide superconductor of the system.
【００４９】また、以上に説明した実施例では、いずれ
も磁場印加手段を複数段に装備した構成としたが、磁場
印加手段を１段だけにすることも考えられる。In each of the embodiments described above, the magnetic field applying means is provided in a plurality of stages. However, it is also conceivable to provide only one magnetic field applying means.
【００５０】[0050]
【発明の効果】請求項１に記載の磁気軸受では、常電導
状態から超電導状態に移行させるための冷却処理期間に
は、磁場印加手段が対応する軸受体から離間された状態
に保持されて、超電導状態の時に磁場印加手段との間に
所定の斥力を生ぜしめるために印加する磁場が冷却処理
時に作用することが防止される。In the magnetic bearing according to the first aspect, during the cooling process period for shifting from the normal conducting state to the superconducting state, the magnetic field applying means is maintained in a state separated from the corresponding bearing body, In the superconducting state, a magnetic field applied to generate a predetermined repulsion between the magnetic field applying means and the magnetic field applying means is prevented from acting during the cooling process.
【００５１】従って、互いに対峙する軸受体と磁場印加
手段との間に得るべき磁気反力が、軸受体を常電導状態
から超電導状態に移行させるための冷却処理によって弱
められてしまうことがなく、軸受体とこれに対峙した磁
場印加手段との間に働く斥力によって軸を非接触状態で
支持することが可能になり、真空環境での使用に適した
磁気軸受の実用化が可能になる。Accordingly, the magnetic reaction force to be obtained between the bearing body and the magnetic field applying means facing each other is not weakened by the cooling process for shifting the bearing body from the normal conducting state to the superconducting state. The shaft can be supported in a non-contact state by a repulsive force acting between the bearing body and the magnetic field applying means facing the bearing body, so that a magnetic bearing suitable for use in a vacuum environment can be put to practical use.
【００５２】請求項２に記載の磁気軸受では、常電導状
態から超電導状態に移行させるための冷却処理期間に
は、磁場印加手段が対応する軸受体の基準の位置からず
れることによって、超電導状態の時に磁場印加手段との
間に所定の斥力を生ぜしめるために印加される磁場とは
逆向きの磁場が冷却処理時に作用し、冷却処理時の印加
磁場による磁化作用によって、冷却処理後の軸受体と磁
場印加手段とは、互いに同じ極性の磁極同士が対峙する
結果となり、これによって、互いに対峙する軸受体と磁
場印加手段との間に得るべき磁気反力が、強められる。In the magnetic bearing according to the second aspect, during the cooling processing period for shifting from the normal conducting state to the superconducting state, the magnetic field applying means deviates from the corresponding reference position of the corresponding bearing body, so that the superconducting state is changed. At the time, a magnetic field opposite to the magnetic field applied to generate a predetermined repulsive force between the magnetic field applying means and the magnetic field applying means acts at the time of cooling processing, and the magnetizing action by the applied magnetic field at the time of cooling processing causes the bearing body after the cooling processing As a result, the magnetic poles having the same polarity face each other, and the magnetic reaction force to be obtained between the bearing body and the magnetic field applying means facing each other is strengthened.
【００５３】従って、軸受体とこれに対峙した磁場印加
手段との間に働く斥力によって軸を非接触状態で支持す
ることが可能になり、真空環境での使用に適した磁気軸
受の実用化が可能になる。Therefore, the shaft can be supported in a non-contact state by the repulsive force acting between the bearing body and the magnetic field applying means facing the bearing body, and a magnetic bearing suitable for use in a vacuum environment can be put to practical use. Will be possible.
【図１】本発明の一実施例の構成説明図である。FIG. 1 is an explanatory diagram of a configuration of an embodiment of the present invention.
【図２】本発明の一実施例の作用説明図である。FIG. 2 is an operation explanatory view of one embodiment of the present invention.
【図３】本発明の他の実施例の構成説明図である。FIG. 3 is a configuration explanatory view of another embodiment of the present invention.
【図４】本発明の他の実施例の作用説明図である。FIG. 4 is an operation explanatory view of another embodiment of the present invention.
１，１００ 軸 ２，３，１０１〜１０６ 磁場印加手段 ４ 軸受箱 ５，６ 軸受体 ８ 軸移動手段 1,100 shafts 2,3,101 to 106 Magnetic field applying means 4 Bearing box 5,6 Bearing body 8 Axis moving means
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01L 39/00 F16C 32/04 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) H01L 39/00 F16C 32/04
Claims (2)
象の軸上に固着されたリング永久磁石製の磁場印加手段
と、この磁場印加手段に対峙するように前記軸が挿通す
る軸受箱内に配備された超電導体製の軸受体と、この軸
受体を冷却して超電導状態にする冷却手段と、前記軸を
上下に移動させる移動手段と、を備えて、超電導状態に
ある前記軸受体とこの軸受体に対峙する磁場印加手段と
の間に働く斥力によって前記軸を支持する磁気軸受であ
って、前記磁場印加手段である永久磁石は、径の異なる複数の
リング状磁石を同心円状に填め込んで、隣接するリング
状磁石の極性が互いに逆極性となるように配置したもの
であり、 前記軸受体を常電導状態から超電導状態に移行させるた
めの前記冷却手段による冷却処理期間には前記軸を軸線
方向に移動操作できる、ことを特徴とする磁気軸受。1. A magnetic field applying means made of a ring permanent magnet fixed on a shaft to be supported for applying a magnetic field to a superconductor, and a bearing box into which said shaft is inserted so as to face said magnetic field applying means. A bearing member made of a superconductor disposed in a cooling means for cooling the bearing body to a superconducting state ; and
Includes moving means for moving up and down, and a magnetic bearing for supporting the shaft by repulsion acting between the bearing body which is in the superconducting state and the magnetic field applying means which faces the bearing member, the magnetic field applied The permanent magnet, which is a means, has multiple
The ring-shaped magnet is inserted concentrically and the adjacent ring
Magnets arranged so that the polarities of the magnets are opposite to each other
In it, the cooling process period by said cooling means for shifting said bearing body from the normal conducting state to the superconducting state can be moved manipulating the shaft in the axial direction, the magnetic bearing, characterized in that.
象の軸上に固着されたリング状永久磁石製の磁場印加手
段と、この磁場印加手段に対峙するように前記軸が挿通
する軸受箱内に配備された超電導体製の軸受体と、この
軸受体を冷却して超電導状態にする冷却手段と、前記軸
を上下に移動させる移動手段と、を備えて、超電導状態
にある前記軸受体とこの軸受体に対峙する磁場印加手段
との間に働く斥力によって前記軸を支持する磁気軸受で
あって、支持対象の軸に、複数のリング状永久磁石が前記軸を中
心としての軸線方向に沿って隣接して装備され、隣接す
るリング磁石の相対する極性が互いに逆極性となるよう
に配置したものであり、 前記軸受体を常電導状態から超電導状態に移行させるた
めの前記冷却手段による冷却処理期間には、前記軸の移
動手段により軸を引き上げ、冷却終了後は引き下げる、
ことを特徴とする磁気軸受。2. A magnetic field applying means made of a ring-shaped permanent magnet fixed on a shaft to be supported to apply a magnetic field to a superconductor, and a bearing box through which the shaft is inserted so as to face the magnetic field applying means. A bearing member made of a superconductor disposed therein, cooling means for cooling the bearing member to a superconducting state, and the shaft
The provided with a moving means for moving up and down, a magnetic bearing for supporting the shaft by repulsion acting between the bearing body which is in the superconducting state and the magnetic field applying means which faces the bearing member, the support subject A plurality of ring-shaped permanent magnets
Equipped adjacently along the axial direction as the
So that the opposite polarities of the ring magnets are opposite to each other.
The bearing body is shifted from a normal conducting state to a superconducting state.
During the cooling process by the cooling means, the shaft is moved.
The shaft is pulled up by the moving means and lowered after cooling is completed.
A magnetic bearing characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09779392A JP3192207B2 (en) | 1992-04-17 | 1992-04-17 | Magnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09779392A JP3192207B2 (en) | 1992-04-17 | 1992-04-17 | Magnetic bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05299706A JPH05299706A (en) | 1993-11-12 |
| JP3192207B2 true JP3192207B2 (en) | 2001-07-23 |
Family
ID=14201692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09779392A Expired - Fee Related JP3192207B2 (en) | 1992-04-17 | 1992-04-17 | Magnetic bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3192207B2 (en) |
-
1992
- 1992-04-17 JP JP09779392A patent/JP3192207B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05299706A (en) | 1993-11-12 |
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