JPS60126803A - Cylindrical coil - Google Patents

Abstract

PURPOSE:To reduce residual stress and thermal stress of a cylindrical coil by a method wherein a metal cylinder is cut spirally, and the sectional area of the conductor per one turn is increased in the axial direction in proportion to approaching to the ends. CONSTITUTION:Conductors 7a, 7b, 7c, 8 and magnet end parts 9 are formed according to machining from a cylindrical copper pipe. Machining thereof is performed by cutting a groove spirally. Layer insulation 10 is performed to the cut groove to be fixed. Thicknesses of the first conductors 7a, the second conductors 7b, the third conductors 7c, the central part conductors 8 are made thicker in proportion to approaching to the ends.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は強磁場を発生する円筒形コイルに関する。[Detailed description of the invention] [Technical field of invention] The present invention relates to a cylindrical coil that generates a strong magnetic field.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

従来の円筒形、多層コイルの１例を第１図に示す。 An example of a conventional cylindrical multilayer coil is shown in FIG.

マグネットは単層巻きの独立した円筒状コイルな同窓的
に複数個盤べて構成して鼠る。単層巻きのコイルは巻回
された導体（１）と円環状のマグネット端部（３）より
構成される。その単層のコイルは導体間の間隙（２）を
設けて並べられる。この導体間の間隙（２）には冷却媒
体を流し導体（１）に通電することによって生ずるジュ
ール熱をとりさる。このマグネ“ツ゛トはその他に単層
のコイル間を電気的に接続する渡り導体（４）、複数個
のコイルを支持する押え板（５）、冷却媒体を収納する
容器（６）より構成される。The magnet is composed of multiple independent cylindrical coils with single-layer winding. A single-layer coil is composed of a wound conductor (1) and an annular magnet end (3). The single layer coils are arranged with gaps (2) between the conductors. A cooling medium is passed through the gap (2) between the conductors to remove Joule heat generated by energizing the conductor (1). This magnet tube also consists of a crossover conductor (4) that electrically connects the single-layer coils, a holding plate (5) that supports multiple coils, and a container (6) that stores the cooling medium. Ru.

導体（１）を巻回して規定の半径に巻き上げ、ターン間
の絶縁を施した後マグネット端部（３）と冶金的に接続
する。マグネットの運転中、導体（１）は磁場Ｘ電流の
電磁力をうける。この電磁力は半径方向に拡張する力（
フープ力）が主成分である。この電゛磁力によって導体
は高い応力にさらされる。導体（１）はジュール発熱に
よって温度上昇をきたし、やはり導体は半径方向に拡が
る。また導体（１）は巻回によって成形したため塑性加
工をしたことに逓りその残留応力は大きい。The conductor (1) is wound to a specified radius, and after providing insulation between turns, it is metallurgically connected to the magnet end (3). During operation of the magnet, the conductor (1) is subjected to the electromagnetic force of the magnetic field and current. This electromagnetic force is a radially expanding force (
hoop force) is the main component. This electromagnetic force exposes the conductor to high stress. The temperature of the conductor (1) increases due to Joule heat generation, and the conductor also expands in the radial direction. Further, since the conductor (1) was formed by winding, the residual stress was large as a result of the plastic working.

このようなことを考えると従来のコイルには次のような
欠点がある。　□ ■　マグネット端部（３）は容量が大きいので電流密度
も低い従がって温度上昇も小さい。一方導体（１）の両
端は電流密度が高く温度上昇も大きい。そのためマグネ
ット端部（３）と導体（１）の温度差が太きく、その間
に働くせん断芯力が大き込。Considering this, conventional coils have the following drawbacks. □ ■ Since the magnet end (3) has a large capacity, the current density is low and therefore the temperature rise is also small. On the other hand, both ends of the conductor (1) have a high current density and a large temperature rise. Therefore, there is a large temperature difference between the magnet end (3) and the conductor (1), and the shear core force acting between them is large.

■　導体（１）には残留応力が大きい。一方導体（１）
に印加される応力は高いのでその寿命は短かい。■ Conductor (1) has large residual stress. One conductor (1)
Since the stress applied to it is high, its lifespan is short.

■　またマグネット端部（３）と導体（１）の応力も前
者が低く、後者が高い。このことはそれぞれの半径方向
の伸びが違うことを意味し、その間に働くせん断芯力が
大きいことを意味する。このためその部分の絶縁材がは
かれることなどの欠点があった。■ Also, the stress at the magnet end (3) and the conductor (1) is low in the former and high in the latter. This means that the elongation in each radial direction is different, and the shear core force acting between them is large. This had the disadvantage that the insulating material in that area was peeled off.

〔発明の目的〕[Purpose of the invention]

本発明は残留応力および熱応力の少い円筒形コイルを提
供することを目的とする。An object of the present invention is to provide a cylindrical coil with low residual stress and thermal stress.

〔発明の概要〕[Summary of the invention]

上記の目的を達成するために本発明の円筒形コイルは金
属円筒をスパイラル状に切削し、軸方向端部における１
ターンあたりの導体断面積を端へ近づくに従って次第に
大きくなるように形成して、素材が円筒であることを利
用して残留応力を低減し、また、端部における大きい導
体断面積を利用して温度上昇したがって熱応力の抑制す
る。In order to achieve the above object, the cylindrical coil of the present invention is produced by cutting a metal cylinder into a spiral shape,
The cross-sectional area of the conductor per turn is formed so that it gradually increases as it approaches the end, and the cylindrical material is used to reduce residual stress, and the large cross-sectional area of the conductor at the end is used to reduce the temperature. The increase thus suppresses thermal stress.

〔発明の実施例〕[Embodiments of the invention]

本発明の１実施例を第２図に示す。これは第１図に示す
ような複数個の円筒状コイルのうちの単層のコイルであ
る。One embodiment of the invention is shown in FIG. This is a single-layer coil among a plurality of cylindrical coils as shown in FIG.

第２図に於てまず導体（７ａ　、７ｂ　、７ｃ　、８　
）とマグネット端部（９）は円筒状の銅バイブより機械
加工によってつくる。この機械加工は放電加工の１種で
あるワイヤカットまたは数値制御旋盤等によってらせん
状に溝を削ることによっておこなう。また削られた溝に
はレア絶縁（１（ｌｌを施し固着する。In Figure 2, we first look at the conductors (7a, 7b, 7c, 8
) and the magnet end (9) are made by machining from a cylindrical copper vibrator. This machining is performed by cutting a spiral groove using a wire cut, which is a type of electric discharge machining, or a numerically controlled lathe. In addition, apply rare insulation (1 (ll) to the cut groove and fix it.

らせん状の溝を加工する時コイルの端部側から数えて１
タ一ン目導体（７ａ）　、　２タ一ン目導体（７ｂ）・
、３タ一ン目導体（７Ｃ）の導体の厚みをマグネッ゛ト
の中央部導体（８）のそれに比べて８　＜　７ｃ　（７
ｂ　（７ａの順に徐々に厚くする。When machining a spiral groove, count from the end of the coil.
First tan conductor (7a), second tan first conductor (7b)
, compare the thickness of the third terminal conductor (7C) with that of the center conductor (8) of the magnet, and find that 8 < 7c (7
b (Gradually thicken in the order of 7a.

第２図では７ｍ　、　７ｂ　、　７ｃの３ターンにっ込
て徐々に導体の厚みを変えるように描いであるがこれは
任意の複数ターンで良い。In Fig. 2, the thickness of the conductor is shown to be gradually changed in three turns of 7m, 7b, and 7c, but any number of turns may be used.

このような構造とすると端部側の導体７ａ　、　７ｂ、
７Ｃはマグネット中央部導体（８）に比べて温度上昇も
小さく、かつ応力も小さいことになる。また円筒状銅パ
イプより旋削によって削っているので導体に残る残留応
力も小さい。With such a structure, the end side conductors 7a, 7b,
7C has a smaller temperature rise and smaller stress than the magnet center conductor (8). In addition, since the conductor is cut by turning from a cylindrical copper pipe, the residual stress remaining in the conductor is small.

本発明によればマグネット端部（３）と１ターン目の導
体（７ａ）が冶金的接続なしで１体ものであるので冶金
的接続による強１度低下がない。また１〜３タ一ン目導
体が厚いので端部に向かって温度、応力とも除々に下が
る。このことはマグネット端部（９）と１タ一ン目導体
の半径方向伸び差が小さくせん断芯力が小さいことを意
味しレア絶縁部のハガレなども生じな−０また全て機械
加工によってコイルを形成するのでコイルの精度も良い
。特にターン間のギャップが一様でレア絶縁α〔も一様
に接着し接着強度も高い。According to the present invention, the magnet end (3) and the first turn conductor (7a) are one piece without metallurgical connection, so there is no decrease in strength due to metallurgical connection. Also, since the first to third terminal conductors are thick, the temperature and stress gradually decrease toward the ends. This means that the difference in radial elongation between the magnet end (9) and the first conductor is small, and the shear core force is small, so peeling of the rare insulation part does not occur. The precision of the coil is also good because it is formed. In particular, the gaps between turns are uniform, the rare insulation α is also adhered uniformly, and the adhesive strength is high.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明の円筒形コイルは金属円筒か
ら削り出し、軸方向端部の導体断面積を中央部より大と
したので残留応力と熱応力が低減される。As explained above, the cylindrical coil of the present invention is machined from a metal cylinder, and the conductor cross-sectional area at the axial ends is larger than that at the center, so residual stress and thermal stress are reduced.

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

第１図は従来の円筒形コイルを用いたマグネット装置の
斜視断面図、第２図は本発明の一実施例の円筒形コイル
の斜視断面図である。 ７ａ　、７ｂ　、　７Ｃ，８−・・導体、９・・・端部
、１０・・・レア絶縁。 代理人弁理士　則　近　憲　佑　（ほか１名）第１図 第２図FIG. 1 is a perspective sectional view of a conventional magnet device using a cylindrical coil, and FIG. 2 is a perspective sectional view of a cylindrical coil according to an embodiment of the present invention. 7a, 7b, 7C, 8--conductor, 9... end, 10... rare insulation. Representative Patent Attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2

Claims (1)

【特許請求の範囲】[Claims] 金属円筒をスパイラル状に切削し軸方向端部におけるＪ
ターンあたりの導体断面積を端へ近づくに従って次第に
大きくなるように形成したことを特徴とする円筒形コイ
ル。　”Cutting a metal cylinder into a spiral shape and cutting J at the axial end
A cylindrical coil characterized in that the conductor cross-sectional area per turn is formed so that it gradually increases as it approaches the end. ”