JPS601813A - Superconductive coil device - Google Patents

Abstract

PURPOSE:To obtain a device having excellent efficiency through lightening, etc. by determining the pitches of support members so as to be kept within stress allowed regarding the performance of a coil and arranging the support members at irregular pitches in the unequal distribution of electromagnetic force of a coil rectilinear section. CONSTITUTION:When a coil rectilinear section is regarded as a beam, both ends thereof are fixed by support members 3, the pitches l of the support members are in inverse proportion to the square root of electromagnetic force W, and the bending stress of a coil is set at a fixed value, thus naturally determining the pitches of the support members according to the magnitude of electromagnetic force. That is, bending stress is not kept constant when then support members are arranged at regular intervals because the distribution of electromagnetic force is not kept constant in the race track type coil. Consequently, there is possibility of which stress of allowable stress or more of the coil is generated in a section of large electromagnetic force in the end section of the coil rectilinear section. Accordingly, the support members 3 are arranged at irregular pitches of l3<l2<l1 in which pitches reduce with an approach to the end section of the coil rectilinear section.

Description

【発明の詳細な説明】 この発明は、超電導コイル装置に関するものであり、も
う少し詳しくいうと、磁気浮上車などに搭載されるレー
ストラック形の超電導コイル装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting coil device, and more specifically, to a racetrack-type superconducting coil device mounted on a magnetically levitated vehicle or the like.

従来、この種の超電導コイル装置は第１図、第２図に示
す構成でなり、図において、レーストラック形状の超電
導コイルｌは冷却用液体ヘリウムが貯蔵された内槽コに
収納され、超電導コイルｌは内槽２内に複数個の支持部
材３で支持されている。また、超電導コイルの直線部に
発生する電磁力を支えるための補強板弘が内槽コに溶接
などで取付けられている。支持部材３には液体もしくは
ガスヘリウムの流路穴３ａが設げられている。Conventionally, this type of superconducting coil device has the configuration shown in Figs. 1 and 2. In the figure, a racetrack-shaped superconducting coil l is housed in an inner tank storing liquid helium for cooling, and the superconducting coil 1 is supported within the inner tank 2 by a plurality of support members 3. Additionally, a reinforcing plate is attached to the inner tank by welding or the like to support the electromagnetic force generated in the straight section of the superconducting coil. The support member 3 is provided with flow passage holes 3a for liquid or gas helium.

以上の構成において、超電導コイル／を励磁したときの
電磁力は、第７図に示すごとく、分布荷重ｗ　、　％Ｗ
　、として発生する。なお、この電磁力はレーストラッ
ク全周に発生するが１図示では／／４１周のみ６分割し
て単位長さ当りの平均分布荷重で示している。この電磁
力は、レーストラック形コイルにおいては、力の大きさ
は必ずｗｊ＜ｗ、２＜ｗｊ＜　Ｗ　４＋＜　Ｗ　ｓ　＜
　Ｗ　Ａの関係があり、レーストラック直線部中央から
半円形部先端まで、順次大きい値となっている。In the above configuration, the electromagnetic force when the superconducting coil is excited is distributed load w, %W, as shown in Figure 7.
, occurs as. This electromagnetic force is generated all around the race track, but in one diagram, only //41 laps are divided into six and shown as an average distributed load per unit length. In a racetrack coil, this electromagnetic force always has a magnitude of wj < w, 2 < wj < W 4+ < W s <
There is a relationship of WA, and the values increase successively from the center of the racetrack straight section to the tip of the semicircular section.

これらコイルに発生する電磁力のうち、半円形部に働く
力Ｗ、〜Ｗ６は円形状に放射線上に働く力なので、フー
プ力ｆとなって超電導コイルｌ自体の引張り剛性でほと
んどバランスが保たれる。しかし、コイル直線部両辺間
では図において撥力が発生し、この力は超電導コイルｌ
から支持部材３を介して内槽コに伝えられ、補強板ダの
引張り剛性でバランスが保たれる。Among the electromagnetic forces generated in these coils, the forces W and ~W6 that act on the semicircular portion are forces that act in a circular radial manner, so they become the hoop force f and are almost balanced by the tensile rigidity of the superconducting coil l itself. It will be done. However, as shown in the figure, a repulsive force is generated between both sides of the coil straight section, and this force
This is transmitted to the inner tank via the support member 3, and the balance is maintained by the tensile rigidity of the reinforcing plate.

ここで、支持部材３間のコイル直線部では、第３図に示
すごとく分布荷重Ｗがかかることになり、曲げ応力が発
生することになる。この曲げ応力が大きいと、コイル性
能に影響を与えると共に含浸されたコイルなどでは表面
にクラックを生じやすいという問題があった。Here, a distributed load W is applied to the coil straight portion between the supporting members 3 as shown in FIG. 3, and bending stress is generated. If this bending stress is large, there is a problem that it affects the coil performance and that cracks are likely to occur on the surface of impregnated coils.

したがって、コイル直線部全面に支持部材３を配置して
コイル曲げ応力が生じないよう忙することが考えられる
が、磁気浮上車搭載用などでは軽量化に及することにな
ると共に、コイルの液体ヘリウムによる冷却効率が悪く
なり得策ではない。Therefore, it is conceivable to arrange the supporting member 3 over the entire straight part of the coil to prevent coil bending stress from occurring, but this would lead to weight reduction when used in magnetic levitation vehicles, etc., and the liquid helium of the coil would be reduced. This is not a good idea as it will reduce the cooling efficiency.

この発明は、以上の事情に鑑みなされたもので、コイル
直線部の均一でない電磁力分布において、コイル性能上
許容される応力内圧入るよう支持部材ピッチを決め、不
等ピッチに配置することにより、上記従来のものの問題
を解消した超電導コイル装置を提供することを目的とす
るものである。This invention was made in view of the above circumstances, and by determining the pitch of the supporting members and arranging them at uneven pitches so that the internal stress pressure that is permissible for the coil performance is contained in the non-uniform electromagnetic force distribution of the straight part of the coil, It is an object of the present invention to provide a superconducting coil device that solves the above-mentioned problems of the conventional device.

以下、この発明の基本となる支持部材ピッチ配置の決め
方について説明する。第３図において、コイル直線部を
支持部材３で両端固定のノ・すと考えると、支持部材ピ
ッチｔと電磁力Ｗによって発生する曲げ応力との関係は
次式で表わされる。Hereinafter, a method of determining the supporting member pitch arrangement, which is the basis of this invention, will be explained. In FIG. 3, assuming that the coil straight portion is fixed at both ends with support members 3, the relationship between the support member pitch t and the bending stress generated by the electromagnetic force W is expressed by the following equation.

ｌコ （コ）式から支持部材ピッチは ｔ：支持部材ピッチ（＊ｍ　） Ｗ：電磁力（ｋｌＦ／間） Ｍ：最大曲げモーメント（ｋｇ／ｙ＋ｍ）２：コイルの
断面係数（−） σ：コイルの曲げ応力（ｋｙ　／　−）（Ｊ）式におい
て、支持部材ピッチｔは電磁力Ｗの平方根に反比例する
ことになり、コイルの曲げ応力を一定値に設定すること
により、電磁力の大きさによって支持部材ピッチはおの
ずと決定することができる。From the formula, the supporting member pitch is: t: Supporting member pitch (*m) W: Electromagnetic force (klF/distance) M: Maximum bending moment (kg/y+m) 2: Coil section modulus (-) σ: In the coil bending stress (ky/-) (J) equation, the supporting member pitch t is inversely proportional to the square root of the electromagnetic force W, and by setting the coil bending stress to a constant value, the magnitude of the electromagnetic force can be The supporting member pitch can be naturally determined by .

言いかえれば、前述のごとく、レーストラック形コイル
では電磁力分布が一定ではないので支持部材ピッチを等
間隔に配置したのでは曲げ応力が一定にならないで、コ
イル直線部の端部で電磁力の大きい部位では、コイルの
許容応力以上の応力が発生するおそれがある。In other words, as mentioned above, the electromagnetic force distribution in racetrack coils is not constant, so even if the supporting member pitches are arranged at equal intervals, the bending stress will not be constant, and the electromagnetic force will be reduced at the ends of the straight parts of the coil. In large parts, stress exceeding the allowable stress of the coil may occur.

よって、第７図に一実施例として示したように、コイル
直線部の端部処至るほどピッチがホさくなる１、＜１コ
くｔｌの不等ピッチに支持部材３．を配置する。具体的
には、実験などでめたコイルの許容曲げ応力以下の値を
設定し、（３）式により支持部材３のピッチを決めれば
、各支持部材間において応力が一定な超電導コイルを得
ることができる。Therefore, as shown in one embodiment in FIG. 7, the supporting members 3 are arranged at irregular pitches of <1 tl, with the pitch becoming thinner toward the ends of the straight coil portion. Place. Specifically, by setting a value below the allowable bending stress of the coil determined through experiments and determining the pitch of the supporting members 3 using equation (3), it is possible to obtain a superconducting coil with constant stress between each supporting member. Can be done.

なお、レーストラックの半円形部においては、前述した
とおり電磁力はコイル部にフープ力となって働きコイル
の引張り剛性でもつため、磁気浮上車用などでは推進力
、振動などで発生する力を支えることができる適当な支
持部材ピッチを設定すればよい。　ゝ 以上のように、この発明は、レーストラック形コイルの
直線部支持部材ピッチを電磁力によって発生する曲げ応
力が一定となるよう決めるので軽量化などから効率のよ
い超電導コイル装置を提供できる効果を有する。In addition, in the semicircular part of a race track, as mentioned above, the electromagnetic force acts as a hoop force on the coil part and has the tensile rigidity of the coil, so in magnetic levitation vehicles etc., the force generated by propulsive force, vibration, etc. What is necessary is to set an appropriate support member pitch that can support the structure. As described above, the present invention has the effect of providing an efficient superconducting coil device due to weight reduction, etc., because the pitch of the straight part support members of the racetrack coil is determined so that the bending stress generated by electromagnetic force is constant. have

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

第１図は従来のものの正断面図、第２図は第１図のｎ−
ｎ線に沿う平面での拡大断面図、第３図は第１図の部分
拡大正断面図、第７図はこの発明の一実施例の一部正断
面図である。 ｌ・・超電導コイル、コ・・内槽、Ｊ・・支持部材、３
ａ・・流路穴、グ・・補強板。 なお、各図中、同一符号は同−又は相当部分を示す。 代理人　大　岩　増　雄 光２図 ｖ）３図 幣４図Figure 1 is a front cross-sectional view of the conventional one, and Figure 2 is the n-
FIG. 3 is a partially enlarged front sectional view of FIG. 1, and FIG. 7 is a partially front sectional view of an embodiment of the present invention. L...Superconducting coil, C...Inner tank, J...Support member, 3
a...Flow path hole, g...reinforcement plate. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masu Oiwa Yumitsu 2 illustrations v) 3 illustrations 4 illustrations

Claims (1)

【特許請求の範囲】[Claims] （１）　液体ヘリウムを貯蔵した内槽と、この内槽に収
納された超電導コイルと、この超電導コイルを前記内槽
に支持する複数の支持部材とでなるレーストラック形の
超電導コイル装置において、前記超電導コイル直線部に
電磁力により発生する前記直線部の曲げ応力に応じて不
等ピッチに配設された前記支持部材を備えてなることを
特徴とする超電導コイル装置。 （コ）不等ピッチが、直線部の中央部から端部方向へ徐
々にピッチが小となる特許請求の範囲第１項記載の超電
導コイル装置。(1) A racetrack type superconducting coil device comprising an inner tank storing liquid helium, a superconducting coil housed in the inner tank, and a plurality of supporting members supporting the superconducting coil in the inner tank, A superconducting coil device comprising: a superconducting coil straight section, the support members being arranged at uneven pitches in accordance with bending stress of the straight section generated by electromagnetic force. (g) The superconducting coil device according to claim 1, wherein the unequal pitch gradually becomes smaller from the center of the straight portion toward the ends.