JPH07201560A - Magnetic field generating method and apparatus - Google Patents
Magnetic field generating method and apparatusInfo
- Publication number
- JPH07201560A JPH07201560A JP5337893A JP33789393A JPH07201560A JP H07201560 A JPH07201560 A JP H07201560A JP 5337893 A JP5337893 A JP 5337893A JP 33789393 A JP33789393 A JP 33789393A JP H07201560 A JPH07201560 A JP H07201560A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- electromagnet
- superconducting bulk
- magnetic
- magnetic flux
- 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.)
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- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気浮上等に使用され
る磁場発生装置に関して強力で安定して磁場が得られる
超電導バルクを使用する磁場発生方法及び装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field generating method used for magnetic levitation and the like, and a magnetic field generating method and apparatus using a superconducting bulk capable of obtaining a strong and stable magnetic field.
【０００２】[0002]
【従来の技術】従来の高性能な磁場発生方法は、例えば
特願平04-087521 号公報に開示されているが、希土類等
の永久磁石を電磁石に張り付けた構造（永久磁石併用電
磁石）であり、電磁石及び永久磁石で発生する磁場を重
畳させて高性能を実現させている。この様にして出来上
がった電磁石は永久磁石から常時磁場が発生しているた
め、磁場を完全になくすことができない。故に、永久磁
石併用電磁石は制作加工，据付工事，運転，メンテナン
ス等において常時磁場が発生しているため作業・操業が
非常に複雑で難しい。また、永久磁石の表面磁束密度は
最大０．４５テスラ程度であり省電力，高性能化におい
て限界がある。なお、電磁石によりその磁気回路上の永
久磁石を励磁，消磁する方法が考えられるが電磁石の起
磁力を永久磁石の保持力の約５倍程度にする必要がある
上に励磁する時発生する永久磁石への電磁力を支持する
構造が必要であり装置が大変大型で実現が難しく問題が
ある。2. Description of the Related Art A conventional high-performance magnetic field generation method is disclosed in, for example, Japanese Patent Application No. 04-087521, which has a structure in which a permanent magnet such as a rare earth element is attached to an electromagnet (electromagnet used with permanent magnet). , Superimposing magnetic fields generated by electromagnets and permanent magnets to achieve high performance. In the electromagnet thus produced, the magnetic field is always generated from the permanent magnet, so the magnetic field cannot be completely eliminated. Therefore, electromagnets combined with permanent magnets are extremely complicated and difficult to work and operate because magnetic fields are constantly generated during production processing, installation work, operation, maintenance, etc. Further, the surface magnetic flux density of the permanent magnet is about 0.45 tesla at the maximum, and there is a limit in saving power and improving performance. A method of exciting and demagnetizing a permanent magnet on the magnetic circuit with an electromagnet can be considered, but the magnetomotive force of the electromagnet needs to be about 5 times the holding force of the permanent magnet and the permanent magnet generated when excited. There is a problem that it is difficult to realize because the device is very large and it is necessary to have a structure to support the electromagnetic force.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上述のような
問題を解決し、永久磁石の替わりに酸化物系超電導バル
クを永久磁石化させて使用することにより、電磁石の性
能，サイズ等を上げることなく電磁石と超電導バルクの
磁束を重畳させて電磁石単体で発生できる磁場以上の強
磁場を発生させるとともに、その作用を利用して電磁石
の電流を弱くした場合でも電磁石単体で発生できる限界
の磁場を発生させる方法及び装置を実現するものであ
る。SUMMARY OF THE INVENTION The present invention solves the above problems and improves the performance, size, etc. of an electromagnet by using an oxide-based superconducting bulk as a permanent magnet instead of a permanent magnet. Without superimposing the magnetic flux of the electromagnet and the superconducting bulk without generating a strong magnetic field that is greater than the magnetic field that can be generated by the electromagnet alone, even if the action is used to weaken the current of the electromagnet, the limit magnetic field that can be generated by the electromagnet alone is generated. The present invention realizes a generating method and apparatus.
【０００４】[0004]
【課題を解決するための手段】その１は、銅線，アルミ
ニウム線または超電導線からなる電磁石において、その
発生磁場の磁気回路上に設置した超電導バルクを電磁石
により着磁し永久磁石化することにより電磁石と超電導
バルクの発生磁場を重畳させより強い磁場を発生させる
とともに、強磁性体のフレームにより超電導バルク及び
磁場印加対象物に磁場が集中するようにした強磁場を得
ることを特徴とする超電導バルクを使用する磁場発生方
法である。[Means for Solving the Problems] The first is to use an electromagnet made of a copper wire, an aluminum wire or a superconducting wire, by magnetizing a superconducting bulk installed on a magnetic circuit of a magnetic field generated by the electromagnet to form a permanent magnet. A superconducting bulk characterized by obtaining a stronger magnetic field by superimposing the magnetic fields generated by an electromagnet and a superconducting bulk to generate a stronger magnetic field and concentrating the magnetic field on the superconducting bulk and the magnetic field application target by the frame of a ferromagnetic material. Is a magnetic field generation method using.
【０００５】その２は、銅線，アルミニウム線または超
電導線からなる電磁石において、その発生磁場の磁気回
路上に設置され電磁石により初期着磁された超電導バル
クと超電導バルク及び磁場印加対象物に磁場が集中する
ように強磁性体のフレームで磁気回路を構成した永久磁
石化された超電導バルクを配置したことを特徴とする磁
場発生装置である。The second is an electromagnet consisting of a copper wire, an aluminum wire or a superconducting wire. It is a magnetic field generation device characterized in that a superconducting bulk made into a permanent magnet, which constitutes a magnetic circuit with a frame of a ferromagnetic material, is arranged so as to concentrate.
【０００６】[0006]
【作用】超電導バルク体が永久磁石として機能する原理
は、超電導体による磁束のピンニングによるものであ
る。超電導体を十分高い磁場中で臨界温度以下に冷却
後、外部磁場を取り去ると超電導体内には、その臨界電
流密度（Ｊｃ）、及びサイズに依存した量の磁束が捕捉
される。この捕捉された磁束がバルク超電導体を永久磁
石のように振る舞わせるのである。捕捉される磁束の分
布は、均質なバルクの場合、図２のようになり、磁束密
度の勾配が臨界電流密度に対応した値となる。すなわ
ち、臨界電流密度が高いほど（勾配が急なほど）、また
バルクサイズが大きいほど中央部のピーク値（最大捕捉
磁束密度）が大きくなることが分かる。The principle that the superconducting bulk body functions as a permanent magnet is due to pinning of magnetic flux by the superconductor. After the superconductor is cooled to a temperature below the critical temperature in a sufficiently high magnetic field and the external magnetic field is removed, the critical current density (Jc) and the amount of magnetic flux depending on the size are trapped in the superconductor. This trapped magnetic flux makes the bulk superconductor behave like a permanent magnet. The distribution of the trapped magnetic flux is as shown in FIG. 2 in the case of a homogeneous bulk, and the gradient of the magnetic flux density has a value corresponding to the critical current density. That is, it can be seen that the higher the critical current density (the steeper the gradient) and the larger the bulk size, the larger the peak value (maximum trapped magnetic flux density) in the central portion.
【０００７】臨界電流密度はピンニング力と比例関係に
あるのでピンニングの強い材料ほど最大捕捉磁束密度も
上昇することになる。これが、ピンニングとの関係を表
している。このことをもう一歩推し進めて、図２のよう
な仮定をもとに計算式を考えるとバルク超電導体の磁束
密度の計算ができる。例えば、ディスク状の試料での表
面の最大捕捉磁束密度は次のような式で表される。Since the critical current density has a proportional relationship with the pinning force, the material having stronger pinning has a higher maximum trapped magnetic flux density. This shows the relationship with pinning. Taking this one step further and considering the calculation formula based on the assumption shown in FIG. 2, the magnetic flux density of the bulk superconductor can be calculated. For example, the maximum trapped magnetic flux density on the surface of a disk-shaped sample is expressed by the following equation.
【０００８】[0008]
【数１】 [Equation 1]
【０００９】ここで、μ0 は真空中の透磁率（４π×１
０-7），Ｊはバルク全体にわたる臨界電流密度（Ａ／ｍ
2 ），Ｌは超電導体の厚み（ｍ），Ｒは超電導体の半径
（ｍ）である。Here, μ 0 is the magnetic permeability in vacuum (4π × 1)
0 -7 ), J is the critical current density (A / m
2 ) and L are the thickness (m) of the superconductor and R is the radius (m) of the superconductor.
【００１０】この式からも、捕捉磁束密度は臨界電流密
度が高いほど、またバルクサイズが大きいほど高くなる
ことが判る。すでに市販されている単一粒化されたディ
スク状の超電導バルク試料の特性を測定した結果、例え
ば４５ｍｍφ×１５ｍｍのサイズでは最大捕捉磁束密度
は０．８テスラで臨界電流密度は約７×１０3 Ａ／ｃｍ
2 であることがわかった。その結果単一粒化であれば最
大捕捉磁束密度は上述の計算式によりほぼ予想できるこ
とがわかった。From this equation, it can be seen that the trapped magnetic flux density increases as the critical current density increases and the bulk size increases. As a result of measuring the characteristics of a single-granulated disc-shaped superconducting bulk sample that has already been commercially available, for example, in the case of a size of 45 mmφ × 15 mm, the maximum trapped magnetic flux density is 0.8 tesla and the critical current density is about 7 × 10 3. A / cm
Turned out to be 2 . As a result, it was found that the maximum trapped magnetic flux density can be almost predicted by the above calculation formula if the particles are made into a single grain.
【００１１】この結論は通常の永久磁石の磁束密度がサ
イズに依存しないということと大きな違いがある。又現
在の高性能な永久磁石（ＮｄＦｅＢ系）の表面磁束密度
が約０．４５テスラであり超電導バルク磁石は現状にお
いても永久磁石を上回ると特性であり、超電導バルク磁
石では磁石を強力にしようとすれば、大きくするだけで
よいということになる。This conclusion differs greatly from the fact that the magnetic flux density of an ordinary permanent magnet does not depend on the size. In addition, the current high-performance permanent magnet (NdFeB system) has a surface magnetic flux density of about 0.45 tesla, and the superconducting bulk magnet has a characteristic that it exceeds the permanent magnet even under the present circumstances. If you do that, you just have to make it larger.
【００１２】現在のところ臨界電流密度が１０×１０3
Ａ／ｃｍ2 または直径１００ｍｍφ，厚さ２０ｍｍの超
電導バルクの単一粒化した試料が成功しており、上述の
式を用いて計算すると図３のようになる。サイズが直径
１００ｍｍφ，厚さ２０ｍｍの場合現状の臨界電流密度
７×１０3 Ａ／ｃｍ2 であっても、また、臨界電流密度
が１×１０4 Ａ／ｃｍ2 の場合現在のサイズ４５ｍｍφ
×１５ｍｍであっても、１枚のバルクで表面磁束密度は
１テスラを越えると予想されより一層磁束密度の向上が
期待される。At present, the critical current density is 10 × 10 3.
A / cm 2 or a superconducting bulk single-grained sample having a diameter of 100 mmφ and a thickness of 20 mm has been successful, and is calculated using the above equation, as shown in FIG. When the size is 100 mmφ and the thickness is 20 mm, the current critical current density is 7 × 10 3 A / cm 2 , and when the critical current density is 1 × 10 4 A / cm 2 , the current size is 45 mmφ.
Even if it is × 15 mm, the surface magnetic flux density is expected to exceed 1 Tesla in one bulk, and further improvement in magnetic flux density is expected.
【００１３】なお、超電導バルクを重ねることにより超
電導バルク表面の磁束密度は同じ厚みの超電導バルクの
磁束密度と同等の値となる。By stacking the superconducting bulks, the magnetic flux density on the surface of the superconducting bulk becomes the same value as the magnetic flux density of the superconducting bulks having the same thickness.
【００１４】次に、本発明における超電導バルクを使用
した電磁石の原理を説明する。Next, the principle of the electromagnet using the superconducting bulk in the present invention will be described.
【００１５】着磁した超電導バルクに外部磁場を与える
と最初の磁場と逆向きの磁場が発生し電磁石と超電導バ
ルクとの磁場が重畳されない。故に常電導状態の超電導
バルクを電磁石の磁場が発生する磁気回路上に設置し、
かつ電磁石の磁束が効率よく超電導バルクに捕捉される
ように磁性体フレームで囲う構造にする。その後、短時
間で電磁石の電流を定格の数倍まで上昇させ、冷却させ
て電磁石の電流を定格まで下げることにより、電磁石の
連続で発生できる磁場と超電導バルクで捕捉された磁場
とが重畳されて強力な磁場が発生する。When an external magnetic field is applied to the magnetized superconducting bulk, a magnetic field in the direction opposite to the initial magnetic field is generated and the magnetic fields of the electromagnet and the superconducting bulk are not superposed. Therefore, the superconducting bulk in the normal conducting state is installed on the magnetic circuit where the magnetic field of the electromagnet is generated.
In addition, the magnetic body frame is used so that the magnetic flux of the electromagnet can be efficiently captured by the superconducting bulk. After that, the current of the electromagnet is increased to several times the rated value in a short time, and the current of the electromagnet is lowered to the rated value by cooling, so that the magnetic field that can be continuously generated by the electromagnet and the magnetic field captured by the superconducting bulk are superimposed. A strong magnetic field is generated.
【００１６】なお、磁場が必要でない場合は、電磁石の
電源を切り、冷媒を抜き取ることにより超電導バルクは
常電導状態に転移し消磁させることができる。If a magnetic field is not required, the superconducting bulk can be transferred to the normal conducting state and demagnetized by turning off the power of the electromagnet and extracting the refrigerant.
【００１７】また、超電導バルクを着磁した後電磁石の
発生磁束を下げる（電流を定格以下に下げる）ことによ
り電磁石単体で発生できる磁束を確保しながら電磁石の
省電力化を実現することができる。Further, by reducing the magnetic flux generated by the electromagnet after magnetizing the superconducting bulk (reducing the current below the rated value), it is possible to realize the power saving of the electromagnet while securing the magnetic flux that can be generated by the electromagnet alone.
【００１８】なお、上記の方法において超電導バルクを
冷却して超電導状態にした後に磁場を加えることでも磁
束はトラップされる。このことより、電磁石として超電
導電磁石を使用する場合においては、上記の方法で当初
高負荷率（高運転電流）で超電導バルクを着磁した後に
負荷率（運転電流）を下げることにより安定して強力な
磁束を発生させることができる。In the above method, the magnetic flux is trapped also by cooling the superconducting bulk to bring it into a superconducting state and then applying a magnetic field. Therefore, when superconducting electromagnets are used as electromagnets, the superconducting bulk is initially magnetized at a high load factor (high operating current) by the above method, and then the load factor (operating current) is lowered to ensure stable and strong operation. A strong magnetic flux can be generated.
【００１９】上記本発明の方法によれば、省電力で強力
な磁場発生が可能となる。According to the above method of the present invention, it is possible to generate a strong magnetic field while saving power.
【００２０】[0020]
【実施例】本発明の実施例を図面を参照しながら以下に
説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２１】実施例１ 図１において符号１はＹ−Ｂａ−Ｃｕ−Ｏ系の酸化物超
電導体（直径１００ｍｍ×厚さ１５ｍｍ）、符号２は液
体窒素中でも使用可能なテレフタル酸系のポリエステル
樹脂を焼き付けた合成エナメル線で作られた円筒型電磁
石（断面２５ｍｍ×９５ｍｍ，ターン数５００ター
ン）、符号３はその電磁石で発生する磁束を集束させる
ための鉄の強磁性体フレーム（内極１００ｍｍφ，外極
５０ｍｍ）でありそれらより構成された磁場発生装置を
準備した。Example 1 In FIG. 1, reference numeral 1 is a Y—Ba—Cu—O type oxide superconductor (diameter 100 mm × thickness 15 mm), and reference numeral 2 is a terephthalic acid type polyester resin that can be used even in liquid nitrogen. Cylindrical electromagnet made of baked synthetic enameled wire (section 25 mm × 95 mm, number of turns 500 turns), reference numeral 3 is an iron ferromagnetic frame (inner pole 100 mmφ, outer for concentrating the magnetic flux generated by the electromagnet). A magnetic field generator having a pole of 50 mm) and composed of them was prepared.
【００２２】この様に構成された磁場発生装置を図１の
符号４の円筒型冷凍容器に設置し外部電源により約４０
０Ａの電流を通電すると同時に液体窒素を注入し超電導
体の臨界温度以下に冷却し超電導バルクに磁束をトラッ
プさせた。その後に、電流を定格値（約３０Ａ）に下げ
て冷却容器の底から３０ｍｍ離れた位置の半径方向の磁
束密度を測定した。The magnetic field generator configured as described above is installed in a cylindrical freezing container denoted by reference numeral 4 in FIG.
At the same time when a current of 0 A was applied, liquid nitrogen was injected to cool the superconductor below the critical temperature and trap the magnetic flux in the superconducting bulk. After that, the current was reduced to the rated value (about 30 A) and the magnetic flux density in the radial direction at a position 30 mm away from the bottom of the cooling container was measured.
【００２３】図４にその結果を示す。図より明らかな様
に、超電導バルクを内蔵した電磁石は後述する（比較例
１）従来の電磁石に比べて約２倍強の磁束を発生させて
おり、強磁場を発生させるために有効な方法であること
が判る。更に、コイル電流を下げた場合（定格の５０
％）において、超電導バルクの磁場が重畳され電磁石単
体の定格発生磁束を維持できる。これは、省電力のため
に有効な方法であることが判る。The results are shown in FIG. As is clear from the figure, the electromagnet containing the superconducting bulk generates a magnetic flux that is about twice as strong as that of the conventional electromagnet described later (Comparative Example 1), and is an effective method for generating a strong magnetic field. I know there is. Furthermore, when the coil current is reduced (rated 50
%), The magnetic field of the superconducting bulk is superposed, and the rated generated magnetic flux of the electromagnet alone can be maintained. This proves to be an effective method for saving power.
【００２４】又、Ｙ−Ｂａ−Ｃｕ−Ｏ系の超電導バルク
の利用は現有する超電導バルクのうち唯一液体窒素温度
以上の臨界温度をもつためで、従って液体窒素で冷却す
ることにより容易で安価な方法を採用した。Further, the use of the Y-Ba-Cu-O-based superconducting bulk is because only one of the existing superconducting bulks has a critical temperature higher than the liquid nitrogen temperature. Therefore, it is easy and inexpensive to cool with liquid nitrogen. Adopted the method.
【００２５】更に、超電導体はＹ−Ｂａ−Ｃｕ−Ｏ系に
限らずいかなる超電導バルクでもよく極低温，高温の超
電導バルクでもよくいずれにおいても上記と同様の効果
が得られる。なお、液体ヘリウムを冷媒として使用する
ことにより超電導バルクの臨界電流密度を向上させ使用
することもできる。Further, the superconductor is not limited to the Y-Ba-Cu-O system, and may be any superconducting bulk, or may be a superconducting bulk at extremely low temperature or high temperature, and the same effect as above can be obtained. By using liquid helium as a refrigerant, it is possible to improve the critical current density of the superconducting bulk and use it.
【００２６】なお、本実施例の装置は安価に仕上げるた
めに非常に簡易な装置にしているが、メンテナンス性向
上，冷媒蒸発量低減等から熱シールド用冷凍機または冷
媒貯蔵タンクを設置する場合がある。Although the apparatus of this embodiment is a very simple apparatus in order to finish at low cost, a heat shield refrigerator or a refrigerant storage tank may be installed in order to improve maintainability and reduce the amount of refrigerant evaporation. is there.
【００２７】比較例１ 超電導バルクの替わりに内極に強磁性体を継ぎ足し、冷
凍容器を使用しない以外は実施例１と同様にした電磁石
を準備して、外部電源により電流を定格値（約１０Ａ）
で通電し電磁石の底から３０ｍｍ離れた位置の半径方向
の磁束密度を測定した。Comparative Example 1 An electromagnet was prepared in the same manner as in Example 1 except that a ferromagnetic material was added to the inner pole instead of the superconducting bulk, and a refrigerating container was not used, and a current was supplied from an external power source at a rated value (about 10 A). )
Then, the magnetic flux density in the radial direction at a position 30 mm away from the bottom of the electromagnet was measured.
【００２８】図４にその結果を示す。図より明らかな様
に、従来の電磁石は超電導バルクを内蔵した電磁石に比
べて発生磁束密度は約１／２に低下する。The results are shown in FIG. As is clear from the figure, the generated magnetic flux density of the conventional electromagnet is reduced to about 1/2 of that of the electromagnet incorporating the superconducting bulk.
【００２９】実施例２ 内極を７０ｍｍφに縮小した以外は実施例１と同様にし
た電磁石を準備し、円筒型冷凍容器に設置し外部電源に
より約４００Ａの電流を通電すると同時に液体窒素を注
入し超電導体の臨界温度以下に冷却し超電導バルクに磁
束をトラップさせた。その後に、電流を定格値（約３０
Ａ）に下げて冷却容器の底から３０ｍｍ離れた位置の半
径方向の磁束密度を測定した。Example 2 An electromagnet similar to that of Example 1 was prepared except that the inner pole was reduced to 70 mmφ, placed in a cylindrical freezing container, and an electric current of about 400 A was applied from an external power source, and at the same time liquid nitrogen was injected. Magnetic flux was trapped in the superconducting bulk by cooling below the critical temperature of the superconductor. After that, change the current to the rated value (about 30
The magnetic flux density in the radial direction at a position 30 mm apart from the bottom of the cooling container was measured by lowering it to A).
【００３０】図４から明らかな様に、実施例１に比べて
約８０％程度となるが、比較例１に比べて１．７倍程度
の強い磁場を発生している。これは、内極の径が縮小さ
れたため同一仕様の電磁石であるにもかかわらず発生磁
束が減少したため磁場は弱くなっているが超電導バルク
を設置することにより磁場が重畳されることが判った。As is clear from FIG. 4, the magnetic field is about 80% of that of the first embodiment, but a strong magnetic field of about 1.7 times that of the first comparative example is generated. It was found that the magnetic field is weak because the magnetic flux generated is reduced because the generated magnetic flux is reduced because the diameter of the inner pole is reduced and the electromagnet has the same specifications, but the magnetic field is superposed by installing the superconducting bulk.
【００３１】比較例２ 内極を４０ｍｍφに縮小した以外は実施例１と同様にし
た電磁石を準備し、円筒型冷凍容器に設置し外部電源に
より約４００Ａの電流を通電すると同時に液体窒素を注
入し超電導体の臨界温度以下に冷却し超電導バルクに磁
束をトラップさせた。その後に、電流を定格値（約３０
Ａ）に下げて冷却容器の底から３０ｍｍ離れた位置の半
径方向の磁束密度を測定した。Comparative Example 2 An electromagnet similar to that of Example 1 was prepared except that the inner pole was reduced to 40 mmφ, placed in a cylindrical freezing container, and an electric current of about 400 A was applied by an external power source, and at the same time liquid nitrogen was injected. Magnetic flux was trapped in the superconducting bulk by cooling below the critical temperature of the superconductor. After that, change the current to the rated value (about 30
The magnetic flux density in the radial direction at a position 30 mm apart from the bottom of the cooling container was measured by lowering it to A).
【００３２】図４から明らかな様に、比較例１に比べて
同レベルの発生磁場になる。これは、内極の径が縮小さ
れたため同一仕様の電磁石であるにもかかわらず発生磁
束が減少したため磁場は弱くなり超電導バルクに捕捉さ
れる磁束が低減され磁場の重畳効果が少ないことが判っ
た。As is apparent from FIG. 4, the generated magnetic field has the same level as that of Comparative Example 1. This is because it was found that the magnetic field was weakened because the magnetic flux generated decreased even though it was an electromagnet of the same specifications because the diameter of the inner pole was reduced, the magnetic flux trapped in the superconducting bulk was reduced, and the magnetic field superimposing effect was small. .
【００３３】この発明の本質は、従来の永久磁石以上の
表面磁束密度をもつ超電導バルクを利用して強力な磁場
を発生させる有効な構造を発明したことであり、同時に
銅線等を液体窒素に浸すことによりコイルの電流密度を
向上させ（同一サイズで約３倍）高性能または小型化を
実現したことである。電磁石の厚みが一定である場合、
内極はなるべく超電導バルク以上のサイズとし内極の直
下に設置するのが好ましい。なお、実施例は円筒型磁場
発生装置を示したがレーストラック型等色々な構造の磁
場発生装置でも同じ効果を出すことが出来る。The essence of the present invention is to invent an effective structure for generating a strong magnetic field by utilizing a superconducting bulk having a surface magnetic flux density higher than that of a conventional permanent magnet. At the same time, a copper wire or the like is converted into liquid nitrogen. Immersion improves the current density of the coil (about three times the same size) and achieves high performance or miniaturization. If the thickness of the electromagnet is constant,
It is preferable that the inner pole has a size larger than that of the superconducting bulk, and that the inner pole is installed immediately below the inner pole. Although the embodiment has shown the cylindrical magnetic field generator, the same effect can be obtained with a racetrack type magnetic field generator having various structures.
【００３４】[0034]
【発明の効果】本発明は、電力消費量を著しく減少させ
るのでランニングコストを低減できまた小規模で強磁場
を発生することができる方法及び装置を実現するもので
ある。Industrial Applicability The present invention realizes a method and apparatus capable of reducing the running cost by significantly reducing the power consumption and generating a strong magnetic field on a small scale.
【図１】 本発明の超電導バルクを利用した磁場発生装
置の例を示す一部断面を説明する図である。FIG. 1 is a diagram illustrating a partial cross section showing an example of a magnetic field generator using a superconducting bulk of the present invention.
【図２】 超電導体内部での磁場分布を説明する図であ
る。FIG. 2 is a diagram for explaining a magnetic field distribution inside a superconductor.
【図３】 超電導バルクの臨界電流密度、サイズに依る
最大捕捉磁束密度を説明する図である。FIG. 3 is a diagram illustrating the critical current density of a superconducting bulk and the maximum trapped magnetic flux density depending on the size.
【図４】 実施例及び比較例の磁束密度分布図である。FIG. 4 is a magnetic flux density distribution diagram of an example and a comparative example.
【図５】 従来の電磁石の例（比較例１）を示す一部断
面を説明する図である。FIG. 5 is a diagram illustrating a partial cross section showing an example of a conventional electromagnet (Comparative example 1).
【図６】 本発明で超電導バルクと強磁性体の位置関係
を変えた例（実施例２）を示す一部断面を説明する図で
ある。FIG. 6 is a diagram illustrating a partial cross section showing an example (Example 2) in which the positional relationship between the superconducting bulk and the ferromagnetic material is changed in the present invention.
【図７】 本発明で超電導バルクと強磁性体の位置関係
を変えた例（比較例２）を示す一部断面を説明する図で
ある。FIG. 7 is a diagram illustrating a partial cross section showing an example (Comparative Example 2) in which the positional relationship between the superconducting bulk and the ferromagnetic material is changed in the present invention.
１…Ｙ−Ｂａ−Ｃｕ−Ｏ系超電導バルク、 ２…電磁
石、３…強磁性体フレーム、 ４…
冷凍容器、５…液体窒素、
６…スペース、７…断熱材、
８…電流ブスバー、９…電流リード、
１０…支持機構。1 ... Y-Ba-Cu-O-based superconducting bulk, 2 ... electromagnet, 3 ... ferromagnetic material frame, 4 ...
Frozen container, 5 ... Liquid nitrogen,
6 ... space, 7 ... heat insulating material,
8 ... current bus bar, 9 ... current lead,
10 ... Support mechanism.
Claims (2)
らなる電磁石において、その発生磁場の磁気回路上に設
置した超電導バルクを電磁石により着磁し永久磁石化す
ることにより電磁石と超電導バルクの発生磁場を重畳さ
せより強い磁場を発生させるとともに、強磁性体のフレ
ームにより超電導バルク及び磁場印加対象物に磁場が集
中するようにした強磁場を得ることを特徴とする超電導
バルクを使用する磁場発生方法。1. An electromagnet comprising a copper wire, an aluminum wire or a superconducting wire, wherein the superconducting bulk installed on the magnetic circuit of the generated magnetic field is magnetized by the electromagnet to become a permanent magnet, thereby generating a magnetic field generated by the electromagnet and the superconducting bulk. A magnetic field generation method using a superconducting bulk, characterized in that a strong magnetic field is generated by superimposing the superconducting bulk and an object to which the magnetic field is applied by superimposing a stronger magnetic field.
らなる電磁石において、その発生磁場の磁気回路上に設
置され電磁石により初期着磁された超電導バルクと超電
導バルク及び磁場印加対象物に磁場が集中するように強
磁性体のフレームで磁気回路を構成した永久磁石化され
た超電導バルクを配置したことを特徴とする磁場発生装
置。2. An electromagnet comprising a copper wire, an aluminum wire or a superconducting wire, wherein the magnetic field is concentrated on the superconducting bulk and the superconducting bulk and the object to which the magnetic field is applied, which is installed on the magnetic circuit of the generated magnetic field and is initially magnetized by the electromagnet. As described above, a magnetic field generator characterized by arranging a superconducting bulk made into a permanent magnet in which a magnetic circuit is constituted by a ferromagnetic frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5337893A JPH07201560A (en) | 1993-12-28 | 1993-12-28 | Magnetic field generating method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5337893A JPH07201560A (en) | 1993-12-28 | 1993-12-28 | Magnetic field generating method and apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07201560A true JPH07201560A (en) | 1995-08-04 |
Family
ID=18312994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5337893A Withdrawn JPH07201560A (en) | 1993-12-28 | 1993-12-28 | Magnetic field generating method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07201560A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248810A (en) * | 1998-02-27 | 1999-09-17 | Rikagaku Kenkyusho | Nuclear magnetic resonance equipment |
| JP2007258447A (en) * | 2006-03-23 | 2007-10-04 | Aisin Seiki Co Ltd | Superconducting magnetic field generator and sputtering film forming apparatus |
| JP2009170565A (en) * | 2008-01-15 | 2009-07-30 | Hitachi Ltd | Magnet magnetization system and magnetized superconducting magnet |
| EP3726544A1 (en) | 2019-04-18 | 2020-10-21 | Bruker Switzerland AG | Superconducting magnet apparatus and method for magnetizing a superconductor bulk magnet by field cooling through a ferromagnetic shield |
-
1993
- 1993-12-28 JP JP5337893A patent/JPH07201560A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11248810A (en) * | 1998-02-27 | 1999-09-17 | Rikagaku Kenkyusho | Nuclear magnetic resonance equipment |
| JP2007258447A (en) * | 2006-03-23 | 2007-10-04 | Aisin Seiki Co Ltd | Superconducting magnetic field generator and sputtering film forming apparatus |
| JP2009170565A (en) * | 2008-01-15 | 2009-07-30 | Hitachi Ltd | Magnet magnetization system and magnetized superconducting magnet |
| US8179218B2 (en) | 2008-01-15 | 2012-05-15 | Hitachi, Ltd. | Magnetizing system and superconducting magnet to be magnetized therewith |
| EP3726544A1 (en) | 2019-04-18 | 2020-10-21 | Bruker Switzerland AG | Superconducting magnet apparatus and method for magnetizing a superconductor bulk magnet by field cooling through a ferromagnetic shield |
| US10998127B2 (en) | 2019-04-18 | 2021-05-04 | Bruker Switzerland Ag | Superconducting magnet apparatus and method for magnetizing a superconductor bulk magnet by field cooling through a ferromagnetic shield |
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