JP5548423B2 - Superconducting coil - Google Patents

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JP5548423B2
JP5548423B2 JP2009245171A JP2009245171A JP5548423B2 JP 5548423 B2 JP5548423 B2 JP 5548423B2 JP 2009245171 A JP2009245171 A JP 2009245171A JP 2009245171 A JP2009245171 A JP 2009245171A JP 5548423 B2 JP5548423 B2 JP 5548423B2
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superconducting coil
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雅載 大保
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本発明は、レーストラック形状の超電導コイルに関する。   The present invention relates to a racetrack-shaped superconducting coil.

超電導マグネットや超電導電動機の界磁コイルとして、レーストラック型超電導コイルを用いる場合がある。レーストラック型超電導コイルにおいては、対向する一対の円弧部と円弧部間で対向する一対の直線部とを有するレーストラック形状の巻枠に超電導線材が巻きつけられる。   A racetrack superconducting coil may be used as a field coil for a superconducting magnet or a superconducting motive. In a racetrack superconducting coil, a superconducting wire is wound around a racetrack-shaped winding frame having a pair of arc portions facing each other and a pair of linear portions facing each other between the arc portions.

レーストラック型超電導コイルの直線部においては、円弧部に比べて超電導線材を巻枠に押し付ける力が加わりにくい。超電導状態を得るために低温に冷却した際、超電導線材が弛み蛇行してしまう。そのため、超電導線材の臨界電流低下等の超電導特性が劣化するという問題が生じてしまう。   In the straight portion of the racetrack superconducting coil, it is difficult to apply a force for pressing the superconducting wire against the winding frame as compared with the arc portion. When cooled to a low temperature to obtain a superconducting state, the superconducting wire loosens and snakes. Therefore, there arises a problem that the superconducting characteristics such as a decrease in the critical current of the superconducting wire are deteriorated.

超電導線材の弛みを解決するため、超電導線材を弛みなく巻くことができるコイル製造装置や、コイルの外周に圧縮力を加える加圧治具を巻いた構造の提案がされている（特許文献１及び２参照）。しかし、提案された解決方法では、製造装置や加圧治具が新たに必要となり、コストの増加を招いてしまう。   In order to solve the slack of the superconducting wire, there has been proposed a coil manufacturing apparatus capable of winding the superconducting wire without slack, and a structure in which a pressing jig for applying a compressive force is wound around the outer periphery of the coil (Patent Document 1 and 2). However, in the proposed solution, a manufacturing apparatus and a pressure jig are newly required, resulting in an increase in cost.

特開２００９−６５１１９号公報JP 2009-65119 A 特許第３０６０５４７号公報Japanese Patent No. 3060547

本発明の目的は、コストの増加を招くことなく、超電導線材の弛みを防止することが可能なレーストラック形状の超電導コイルを提供することにある。   An object of the present invention is to provide a racetrack-shaped superconducting coil capable of preventing a superconducting wire from slackening without causing an increase in cost.

本発明の一態様によれば、中心軸に対して垂直に切った断面において、対向する一対の円弧により、外側に膨らみを有する形状の対向する一対の曲線を繋いだ外周形状を有する環状の巻枠と、巻枠の外周に巻かれた超電導線材とを備え、一対の曲線のそれぞれは、中央部が両端部よりも外側に膨らんだ曲線であり、曲線の両端を結ぶ直線の長さに対する、直線からの中央部の突出厚さの百分率が１．２５％以上、且つ６．２５％以下であり、直線の延伸方向における巻枠の幅が直線の直交方向における巻枠の幅より大きい超電導コイルが提供される。 According to one aspect of the present invention, in a cross section cut perpendicularly to the central axis, an annular winding having an outer peripheral shape connecting a pair of opposing curves having a bulge outward by a pair of opposing arcs. A frame and a superconducting wire wound around the outer periphery of the winding frame, each of the pair of curves is a curve in which the center portion swells outward from both ends, and the length of a straight line connecting both ends of the curve, A superconducting coil in which the percentage of the projecting thickness of the central portion from the straight line is not less than 1.25% and not more than 6.25%, and the width of the winding frame in the extending direction of the straight line is larger than the width of the winding frame in the orthogonal direction of the straight line Is provided.

本発明によれば、コストの増加を招くことなく、超電導線材の弛みを防止することが可能なレーストラック形状の超電導コイルを提供することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the superconducting coil of the race track shape which can prevent the slack of a superconducting wire, without causing the increase in cost.

本発明の実施の形態に係るレーストラック形状の超電導コイルの一例を示す斜視図である。1 is a perspective view showing an example of a racetrack-shaped superconducting coil according to an embodiment of the present invention. 図１に示した超電導コイルのＡ−Ａ断面を示す概略図である。It is the schematic which shows the AA cross section of the superconducting coil shown in FIG. 本発明の実施の形態に係る超電導コイルの超電導線材の一例を示す断面図である。It is sectional drawing which shows an example of the superconducting wire of the superconducting coil which concerns on embodiment of this invention. 従来のレーストラック形状の超電導コイルの一例を示す断面図である。It is sectional drawing which shows an example of the conventional superconducting coil of a racetrack shape. 本発明の実施の形態に係るレーストラック形状の超電導コイルの他の例を示す断面図である。It is sectional drawing which shows the other example of the superconducting coil of the racetrack shape which concerns on embodiment of this invention. 本発明のその他の実施の形態に係る超電導コイルの一例を示す断面図である。It is sectional drawing which shows an example of the superconducting coil which concerns on other embodiment of this invention.

以下図面を参照して、本発明の形態について説明する。以下の図面の記載において、同一または類似の部分には同一または類似の符号が付してある。但し、図面は模式的なものであり、厚みと平面寸法との関係、各層の厚みの比率等は現実のものとは異なることに留意すべきである。したがって、具体的な厚みや寸法は以下の説明を参酌して判断すべきものである。また図面相互間においても互いの寸法の関係や比率が異なる部分が含まれていることは勿論である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

又、以下に示す本発明の実施の形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記のものに特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された技術的範囲内において、種々の変更を加えることができる。   The following embodiments of the present invention exemplify apparatuses and methods for embodying the technical idea of the present invention. The technical idea of the present invention is based on the material and shape of component parts. The structure, arrangement, etc. are not specified below. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

本発明の実施の形態に係る超電導コイルは、図１に示すように、巻枠１０、及び超電導線材１２を備える。巻枠１０は環状で、超電導線材１２は巻枠１０の外周に巻かれる。   The superconducting coil according to the embodiment of the present invention includes a winding frame 10 and a superconducting wire 12 as shown in FIG. The winding frame 10 is annular, and the superconducting wire 12 is wound around the outer periphery of the winding frame 10.

巻枠１０は、図２に示すように、巻枠１０の中心軸に対して垂直に切った断面において、対向する第１及び第２円弧部１４ａ、１４ｂ、及び第１及び第２円弧部１４ａ、１４ｂの間を接続する一対の中間部１６を有する。第１及び第２円弧部１４ａ、１４ｂの外縁は、それぞれ半径Ｒで中心点Ｃａ、Ｃｂの円弧Ａａ、Ａｂである。中間部１６の外縁は、曲線Ａｃである。   As shown in FIG. 2, the reel 10 has first and second arc portions 14 a and 14 b and first and second arc portions 14 a that face each other in a cross section cut perpendicularly to the central axis of the reel 10. , 14b, a pair of intermediate portions 16 are connected. The outer edges of the first and second arc portions 14a and 14b are arcs Aa and Ab having a radius R and center points Ca and Cb, respectively. The outer edge of the intermediate portion 16 is a curve Ac.

曲線Ａｃの両端に結ぶ直線ＳＬに直交する方向において、曲線Ａｃは直線ＳＬから巻枠１０の外側にふくらみを有する曲線である。曲線Ａｃの突出部の厚さはｄである。曲線Ａｃは、例えば、円弧Ａａ、Ａｂよりも大きな曲率半径を有する円弧、楕円弧等の曲線である。   The curve Ac is a curve having a bulge on the outside of the winding frame 10 from the straight line SL in a direction orthogonal to the straight line SL connected to both ends of the curve Ac. The thickness of the protruding portion of the curve Ac is d. The curve Ac is, for example, a curve such as an arc or an elliptical arc having a larger radius of curvature than the arcs Aa and Ab.

巻枠１０は、直線ＳＬの延伸方向に長幅Ｌｆ、及び直線ＳＬの直交方向に短幅Ｗｆを有する。また、対向する直線ＳＬの長さＬは中間部１６の長さで、対向する直線ＳＬ間の間隔Ｗは円弧Ａａ、Ａｂの弦長である。   The winding frame 10 has a long width Lf in the extending direction of the straight line SL and a short width Wf in the orthogonal direction of the straight line SL. Further, the length L of the opposing straight line SL is the length of the intermediate portion 16, and the interval W between the opposing straight lines SL is the chord length of the arcs Aa and Ab.

巻枠１０として、ガラス繊維強化プラスティック（ＧＦＲＰ）、カーボン繊維強化プラスティック（ＣＦＲＰ）、窒化アルミニウム（ＡｌＮ）、及びステンレス鋼、アルミニウム、銅、真鍮等の金属材料が使用可能である。   As the winding frame 10, glass fiber reinforced plastic (GFRP), carbon fiber reinforced plastic (CFRP), aluminum nitride (AlN), and metal materials such as stainless steel, aluminum, copper, and brass can be used.

超電導線材１２は、図３に示すように、テープ状の基板４０上に中間層４２、超電導層４４、及び安定化層４６を含む。例えば、超電導層４４として、通常の超伝導体が使用可能であるが、高温超電導体、特に、ビスマス（Ｂｉ）系酸化物、希土類酸化物等の酸化物系高温超電導体が望ましい。希土類酸化物等として、ガドリニウム（Ｇｄ）、イットリウム（Ｙ）、サマリウム（Ｓｍ）等の希土類元素（ＲＥ）、バリウム（Ｂａ）、及び銅（Ｃｕ）を１：２：３の元素比で含む希土類酸化物（ＲＥＢａ2Ｃｕ3Ｏx、以下においてＲＥ１２３系酸化物超電導体と記す。）等が用いられる。 As shown in FIG. 3, the superconducting wire 12 includes an intermediate layer 42, a superconducting layer 44, and a stabilization layer 46 on a tape-like substrate 40. For example, a normal superconductor can be used as the superconducting layer 44, but a high-temperature superconductor, in particular, an oxide-based high-temperature superconductor such as a bismuth (Bi) -based oxide or a rare earth oxide is desirable. Rare earths containing rare earth elements (RE) such as gadolinium (Gd), yttrium (Y), samarium (Sm), barium (Ba), and copper (Cu) in an element ratio of 1: 2: 3 as rare earth oxides An oxide (REBa 2 Cu 3 O x , hereinafter referred to as RE123-based oxide superconductor) or the like is used.

基板４０として、Ｎｉ合金テープ等が用いられる。中間層４２として、ガドリニウムジルコニウム酸化物（Ｇｄ2Ｚｒ2Ｏ7）、酸化セリウム（ＣｅＯ2）、イットリア安定化ジルコニア（ＹＳＺ）等の酸化物、又はこれらの酸化物の多層膜が用いられる。安定化層４６として、銀（Ａｇ）等の金属が用いられる。 A Ni alloy tape or the like is used as the substrate 40. As the intermediate layer 42, an oxide such as gadolinium zirconium oxide (Gd 2 Zr 2 O 7 ), cerium oxide (CeO 2 ), yttria stabilized zirconia (YSZ), or a multilayer film of these oxides is used. A metal such as silver (Ag) is used as the stabilization layer 46.

従来のレーストラック型超電導コイルでは、図４に示すように、対向する第１及び第２円弧部１１４ａ、１１４ｂと、第１及び第２円弧部１１４ａ、１１４ｂ間で対向する一対の中間部１１６とを有する巻枠１１０に超電導線材１１２が巻きつけられる。   In the conventional racetrack superconducting coil, as shown in FIG. 4, the first and second arc portions 114a and 114b facing each other, and a pair of intermediate portions 116 facing each other between the first and second arc portions 114a and 114b, A superconducting wire 112 is wound around a winding frame 110 having the following structure.

第１及び第２円弧部１１４ａ、１１４ｂの外縁は円弧であるので、第１及び第２円弧部１１４ａ、１１４ｂにおいては、超電導線材１１２を巻枠１１０に押し付ける力が働く。しかし、中間部１１６の外縁は直線であるので、中間部１１６においては、超電導線材１１２を巻枠１１０に押し付ける力が発生しない。そのため、超電導コイルを液体窒素温度等の低温に冷却した際、超電導線材が弛み蛇行してしまう。その結果、超電導線材の臨界電流低下等の超電導特性が劣化してしまう。   Since the outer edges of the first and second arc portions 114a and 114b are arcs, a force pressing the superconducting wire 112 against the winding frame 110 acts on the first and second arc portions 114a and 114b. However, since the outer edge of the intermediate portion 116 is a straight line, no force is generated to press the superconducting wire 112 against the winding frame 110 in the intermediate portion 116. Therefore, when the superconducting coil is cooled to a low temperature such as a liquid nitrogen temperature, the superconducting wire is loosened and meanders. As a result, superconducting characteristics such as a decrease in critical current of the superconducting wire are deteriorated.

実施の形態では、中間部１６の外縁は曲線Ａｃである。したがって、第１及び第２円弧部１４ａ、１４ｂと同様に、中間部１６においても超電導線材１２を巻枠１０に押し付ける力が働く。超電導コイルを低温に冷却しても、超電導線材１２の弛みを防止することができ、超電導線材１２の超電導特性の劣化を防止することが可能となる。   In the embodiment, the outer edge of the intermediate portion 16 is a curve Ac. Therefore, as in the first and second arc portions 14a and 14b, the force that presses the superconducting wire 12 against the reel 10 also acts in the intermediate portion 16. Even if the superconducting coil is cooled to a low temperature, the superconducting wire 12 can be prevented from slackening, and the superconducting characteristics of the superconducting wire 12 can be prevented from deteriorating.

なお、レーストラック形状コイルは、通常用いられる円形コイルに比べると、デッドスペースを減少させることができる。したがって、レーストラック形状の超電導コイルを用いることにより、超電導マグネット、超電導電動機、発電機等を小型化することが可能となる。このような観点から、図２に示した超電導コイルでは、巻枠１０の長幅Ｌｆは、短幅Ｗｆより大きくする。即ち、Ｌｆ＞Ｗｆ＝Ｗ＋２ｄとする。   Note that the racetrack-shaped coil can reduce the dead space as compared to a circular coil that is normally used. Therefore, by using a racetrack-shaped superconducting coil, it is possible to downsize a superconducting magnet, a superconducting motive, a generator, and the like. From such a viewpoint, in the superconducting coil shown in FIG. 2, the long width Lf of the winding frame 10 is made larger than the short width Wf. That is, Lf> Wf = W + 2d.

図１及び図２に示した超電導コイルについて、中間部１６の曲線Ａｃの曲率半径を変えることにより最大距離ｄを変化させて作製し、超電導特性の劣化を評価している。具体的には、巻枠１０は、ＧＦＲＰ製で、第１及び第２円弧部１４ａ、１４ｂの半径Ｒが約３５ｍｍ、直線ＳＬの間隔Ｗが約７０ｍｍ、直線ＳＬの長さＬが約８０ｍｍ、第１及び第２円弧部１４ａ、１４ｂの厚さが約５ｍｍである。巻枠１０に、ＲＥ１２３系酸化物超伝導体を含む厚さが約０．２ｍｍ、幅が約５ｍｍ、全長約５ｍの超電導線材１２が巻きつけられる。The superconducting coil shown in FIGS. 1 and 2 is manufactured by changing the maximum distance d by changing the radius of curvature of the curve Ac of the intermediate portion 16 to evaluate the deterioration of the superconducting characteristics. Specifically, the reel 10 is made of GFRP, the radius R of the first and second arc portions 14a, 14b is about 35 mm, the interval W between the straight lines SL is about 70 mm, the length L of the straight line SL is about 80 mm, The thickness of the first and second arc portions 14a and 14b is about 5 mm. A superconducting wire 12 having a thickness of about 0.2 mm, a width of about 5 mm, and a total length of about 5 m including the RE123-based oxide superconductor is wound around the winding frame 10.

表１に示すように、巻枠１０の中間部１６の曲率半径を変えて、厚さｄがそれぞれ１ｍｍ、３ｍｍ、５ｍｍとした試料Ａ、Ｂ、Ｃを準備した。この場合、厚さｄの長さＬに対する百分率はそれぞれ１．２５％、３．７５％、６．２５％となる。また、比較例として、図４に示したように、中間部が直線である従来のレーストラック型超電導コイルも準備した。

Figure 0005548423
As shown in Table 1, samples A, B, and C having thickness d of 1 mm, 3 mm, and 5 mm, respectively, were prepared by changing the radius of curvature of the intermediate portion 16 of the winding frame 10. In this case, the percentages of the thickness d with respect to the length L are 1.25 %, 3.75 %, and 6.25 %, respectively. As a comparative example, a conventional racetrack superconducting coil having a straight middle portion as shown in FIG. 4 was also prepared.
Figure 0005548423

作製した超電導コイルについて、液体窒素中で臨界電流を測定し、巻線前の超電導線材の臨界電流と比較することにより超電導特性の劣化の有無を判定した。なお、超電導線材の巻線により発生する経験磁場による臨界電流の低下は無視している。   About the produced superconducting coil, the critical current was measured in liquid nitrogen, and the presence or absence of deterioration of superconducting characteristics was judged by comparing with the critical current of the superconducting wire before winding. Note that the decrease in critical current due to the empirical magnetic field generated by the winding of the superconducting wire is ignored.

表１に示すように、中間部１６の外縁を曲線Ａｃとした試料Ａ、Ｂ、Ｃではいずれも超電導特性の劣化はない。一方、中間部１１６の外縁が直線である比較例では、超電導特性が劣化している。また、超電導コイルの臨界電流測定後の外観検査において、試料Ａ、Ｂ、Ｃでは超電導線材１２に異常がなく、比較例では超電導線材１１２が蛇行していることを確認している。   As shown in Table 1, the samples A, B, and C in which the outer edge of the intermediate portion 16 is a curve Ac do not deteriorate the superconducting characteristics. On the other hand, in the comparative example in which the outer edge of the intermediate portion 116 is a straight line, the superconducting characteristics are deteriorated. Further, in the appearance inspection after the measurement of the critical current of the superconducting coil, it was confirmed that the samples A, B, and C had no abnormality in the superconducting wire 12 and the superconducting wire 112 meandered in the comparative example.

このように、実施の形態による超電導コイルでは、中間部１６が曲線Ａｃであるので、中間部１６においても超電導線材１２を巻枠１０に押し付ける力が働く。そのため、超電導コイルを液体窒素温度に冷却しても、超電導線材１２の弛みを防止することができ、超電導線材１２の超電導特性の劣化を防止することができる。   Thus, in the superconducting coil according to the embodiment, since the intermediate portion 16 is the curve Ac, the force that presses the superconducting wire 12 against the winding frame 10 also acts in the intermediate portion 16. Therefore, even if the superconducting coil is cooled to the liquid nitrogen temperature, the superconducting wire 12 can be prevented from slackening, and the superconducting characteristics of the superconducting wire 12 can be prevented from deteriorating.

また、巻枠１０として、超電導線材１２よりも小さな線膨張係数の材料を用いることが望ましい。超電導コイルを低温に冷却する場合、線膨張係数が大きな超電導線材１２のほうが巻枠１０より収縮する。その結果、超電導線材１２には、巻枠１０に対して押し付ける力が作用するため、超電導線材１２の弛みを更に効果的に防止することが可能となる。特に、図３に示したＲＥ１２３系酸化物超伝導体を用いた超電導線材１２では、中間層４２、超電導層４４及び安定化層４６の厚さの総和に比べて、基板４０の厚さのほうが大きい。したがって、巻枠１０が、基板４０より線膨張係数が小さくなるようにする。例えば、基板４０として用いられるＮｉ合金の線膨張係数は、約１１×１０-6Ｋ-1であるので、巻枠１０として線膨張係数が約４×１０-6Ｋ-1のＡｌＮ等が使用可能である。
Moreover, it is desirable to use a material having a smaller linear expansion coefficient than the superconducting wire 12 as the winding frame 10. When the superconducting coil is cooled to a low temperature, the superconducting wire 12 having a larger linear expansion coefficient contracts from the winding frame 10. As a result, the superconducting wire 12 is subjected to a pressing force against the winding frame 10, so that it is possible to more effectively prevent the superconducting wire 12 from loosening. In particular, in the superconducting wire 12 using the RE123-based oxide superconductor shown in FIG. 3, the thickness of the substrate 40 is larger than the total thickness of the intermediate layer 42, the superconducting layer 44, and the stabilizing layer 46. large. Therefore, the reel 10 has a smaller linear expansion coefficient than the substrate 40. For example, since the linear expansion coefficient of the Ni alloy used as the substrate 40 is about 11 × 10 −6 K −1 , AlN or the like having a linear expansion coefficient of about 4 × 10 −6 K −1 is used as the winding frame 10. Is possible.

なお、図１及び図２に示した巻枠１０では、中間部１６の内縁は直線となっている。しかし、中間部１６の内縁は曲線であってもよい。図５に示すように、巻枠１０ａの中間部１６の内縁を曲線Ａｃと相似の曲線としてもよい。   In addition, in the reel 10 shown in FIG.1 and FIG.2, the inner edge of the intermediate part 16 is a straight line. However, the inner edge of the intermediate portion 16 may be a curved line. As shown in FIG. 5, the inner edge of the intermediate portion 16 of the reel 10a may be a curve similar to the curve Ac.

（その他の実施の形態）
上記のように、本発明の実施の形態を記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者にはさまざまな代替実施の形態、実施例及び運用技術が明らかとなろう。 (Other embodiments)
Although the embodiments of the present invention have been described as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

本発明の実施の形態においては、レーストラック形状の超電導コイルについて説明しているが、巻枠に直線部が含まれる超電導コイルにも適用することができる。例えば、矩形状の巻枠では、角部以外の４辺が直線である。この場合、図６に示すように、巻枠１０ｂの４辺を曲線にすればよい。例えば、長幅Ｌを有する外縁においては、点線で示した矩形状の辺から厚さｄの突出部を有する曲線を設ける。短幅Ｌａを有する外縁においては、点線で示した矩形状の辺から厚さｄａの突出部を有する曲線を設ける。ここで、厚さｄの長幅Ｌに対する百分率、及び厚さｄａの短幅Ｌａに対する百分率はともに１．２５％以上とする。 In the embodiment of the present invention, a racetrack-shaped superconducting coil is described, but the present invention can also be applied to a superconducting coil in which a linear portion is included in a winding frame. For example, in a rectangular winding frame, the four sides other than the corners are straight lines. In this case, as shown in FIG. 6, the four sides of the reel 10b may be curved. For example, at the outer edge having the long width L, a curve having a protruding portion having a thickness d from a rectangular side indicated by a dotted line is provided. On the outer edge having the short width La, a curve having a protruding portion having a thickness da from a rectangular side indicated by a dotted line is provided. Here, the percentage of the thickness d to the long width L and the percentage of the thickness da to the short width La are both 1.25 % or more.

このように、本発明はここでは記載していないさまざまな実施の形態等を含むことは勿論である。したがって、本発明の技術的範囲は上記の説明から妥当な特許請求の範囲に係わる発明特定事項によってのみ定められるものである。   As described above, the present invention naturally includes various embodiments that are not described herein. Accordingly, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

本発明は、超電導マグネット、超電導電動機、発電機等に利用することができる。   The present invention can be used for superconducting magnets, superconducting motives, generators, and the like.

１０…巻枠
１２…超電導線材
１４ａ…第１円弧部
１４ｂ…第２円弧部
１６…中間部
４０…基板
４２…中間層
４４…超電導層
４６…安定化層 DESCRIPTION OF SYMBOLS 10 ... Winding frame 12 ... Superconducting wire 14a ... 1st circular arc part 14b ... 2nd circular arc part 16 ... Intermediate | middle part 40 ... Substrate 42 ... Intermediate | middle layer 44 ... Superconducting layer 46 ... Stabilization layer

Claims (5)

中心軸に対して垂直に切った断面において、対向する一対の円弧により、外側に膨らみを有する形状の対向する一対の曲線を繋いだ外周形状を有する環状の巻枠と、
前記巻枠の外周に巻かれた超電導線材とを備え、
前記一対の曲線のそれぞれは、中央部が両端部よりも外側に膨らんだ曲線であり、該曲線の両端を結ぶ直線の長さに対する、前記直線からの前記中央部の突出厚さの百分率が１．２５％以上、且つ６．２５％以下であり、前記直線の延伸方向における前記巻枠の幅が前記直線の直交方向における前記巻枠の幅より大きいことを特徴とする超電導コイル。 In a cross section cut perpendicular to the central axis, an annular winding frame having an outer peripheral shape connecting a pair of opposing curves of a shape having a bulge on the outside by a pair of opposing arcs;
A superconducting wire wound around the outer periphery of the reel,
Each of the pair of curves is a curve in which the central portion swells outward from both ends, and the percentage of the protruding thickness of the central portion from the straight line with respect to the length of the straight line connecting both ends of the curve is 1 A superconducting coil having a width of not less than .25% and not more than 6.25% , wherein the width of the winding frame in the straight line extending direction is larger than the width of the winding frame in the direction perpendicular to the straight line. 前記超電導線材が、高温超電導体を含むことを特徴とする請求項１に記載の超電導コイル。   The superconducting coil according to claim 1, wherein the superconducting wire includes a high-temperature superconductor. 前記高温超電導体が、希土類元素、バリウム及び銅を１：２：３の元素比で含む希土類酸化物であることを特徴とする請求項２に記載の超電導コイル。   3. The superconducting coil according to claim 2, wherein the high-temperature superconductor is a rare earth oxide containing rare earth elements, barium and copper in an element ratio of 1: 2: 3. 前記超電導線材が、前記高温超電導体が堆積されたテープ状基板を更に含むことを特徴とする請求項２又は３に記載の超電導コイル。   The superconducting coil according to claim 2 or 3, wherein the superconducting wire further includes a tape-like substrate on which the high-temperature superconductor is deposited. 前記巻枠が、前記基板より小さな線膨張係数を有することを特徴とする請求項４に記載の超電導コイル。   The superconducting coil according to claim 4, wherein the winding frame has a smaller linear expansion coefficient than the substrate.
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