JPS61222208A - Electromagnet apparatus - Google Patents
Electromagnet apparatusInfo
- Publication number
- JPS61222208A JPS61222208A JP60062136A JP6213685A JPS61222208A JP S61222208 A JPS61222208 A JP S61222208A JP 60062136 A JP60062136 A JP 60062136A JP 6213685 A JP6213685 A JP 6213685A JP S61222208 A JPS61222208 A JP S61222208A
- Authority
- JP
- Japan
- Prior art keywords
- yokes
- gap
- spacer
- return
- electromagnet
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
各種の磁気計測例えば高分解能の核磁気共鳴(NMR)
測定に使用する電磁石装置に利用する。[Detailed description of the invention] [Industrial application field] Various magnetic measurements such as high-resolution nuclear magnetic resonance (NMR)
Used in electromagnetic equipment used for measurements.
NMR測定に使用する電磁石装置としては第3図に示す
ようなピッター型電磁石装置がある。この装置はギャッ
プ部1を挿んで0型の鉄心1.ヨーク2の補極3が対向
し、前記ヨーク2にコイル4. 。As an electromagnet device used for NMR measurement, there is a Pitter type electromagnet device as shown in FIG. This device inserts the gap part 1 and inserts the 0 type iron core 1. A commutating pole 3 of the yoke 2 faces the yoke 2, and a coil 4. .
4′を巻回したものである。このコイルに通電すればイ
ヤッゾ部1に磁束を発生するようにしたものである。4' is wound. When this coil is energized, magnetic flux is generated in the Iazzo section 1.
高分解能の蘭測定を行うには磁場の均一度安定度の極め
て高いものが要求される。しかし乍ら第3図のような電
磁石装置ではヨークがQ型であシ組立て上精度のよいギ
ャップの平行出しができないこと、又ギャップ部の機械
的の安定性が良くないという欠点がある。即ちコイルに
通電して磁場を発生すると、その磁場により左右のヨー
クがスペーサを介在させて突き合せ前記2個の電磁石の
間にギャップを構成せしめた電磁石装置を提供するもの
である。In order to perform high-resolution measurements, extremely high homogeneity and stability of the magnetic field are required. However, the electromagnetic device shown in FIG. 3 has a Q-shaped yoke, which makes it impossible to accurately align the gap in parallel during assembly, and the mechanical stability of the gap is poor. That is, when a coil is energized to generate a magnetic field, the left and right yokes abut each other with a spacer interposed therebetween due to the magnetic field, thereby forming a gap between the two electromagnets.
上述のNi −Fe合金等は熱膨張係数が純鉄に比し極
めて小さい。このためNi−Fe合金をスペーサとして
ギャップ間に挿入し、ギャップ間を機械的に締めつけれ
ばギャップの間隔は熱的に変動することなく略一定の間
隔に保持することができる。The above-mentioned Ni--Fe alloy and the like have an extremely small coefficient of thermal expansion compared to pure iron. Therefore, by inserting a Ni--Fe alloy as a spacer between the gaps and mechanically tightening the gaps, the gaps can be maintained at substantially constant intervals without being thermally fluctuated.
第1図は本発明による電磁石装置の1実施例を示す断面
図(、)と上面斜視図を示す。2,2′は夫々断面が凸
状の筒状の主ヨークを示す。4,41は夫夫主ヨーク2
,2′の突部に巻装されたコイルである。5,5′はリ
ング状のリターンヨークでデルドアによってヨーク2,
2′に取シ付けられ、該リターンヨーク5,5′と主ヨ
ークの突部の側壁との間に構成される空所にコイル4,
4′が挿入固定される。図においてこのようにして構成
され″た上下の電磁石A、Bは同形のものである。この
電磁石A。FIG. 1 shows a cross-sectional view (,) and a top perspective view showing one embodiment of an electromagnetic device according to the present invention. Reference numerals 2 and 2' indicate cylindrical main yokes each having a convex cross section. 4,41 is husband husband yoke 2
, 2' is a coil wound around the protrusion. 5, 5' is a ring-shaped return yoke, which is attached to yoke 2 by Deldoor.
2', and a coil 4, is installed in a space formed between the return yokes 5, 5' and the side wall of the protrusion of the main yoke.
4' is inserted and fixed. In the figure, the upper and lower electromagnets A and B constructed in this manner have the same shape.
Bを主ヨークの突部をギャップ1を挿んで突き合わせ、
リターンヨークの突き合わせ部分のギャップの間に35
%Ni −Fe合金よシなるスペーサ6を介在させ上下
の電磁石を強固に締め付は本発明による電磁石装置が完
成される。本発明による電磁石装置は上述のような構造
を有し上方の電磁石Aと下方の電磁石Bは対象的に配置
されるから磁極の平行度が容易に得られて主ヨークのギ
ャップ1の設計高と同じ高さのリング状のスペーサ6を
上下のリターンヨークに当接させて間挿すれば上下ヨー
ク間の磁気ギャップは極めて正確に形成される。さらに
このスペーサは35 at%のNi −Fe合金で熱膨
張係数はI X 10−6であるから鉄心で構成された
ヨーク、リターンヨークの15X10−6よりは大幅に
小さい。第2図は本発明の他の実施例でスペーサ6の外
周にリング状の炭素鋼で構成された芯出しヨーク8を挿
着して締めつけたものである。Butt B with the protrusion of the main yoke through gap 1,
35 between the gap between the return yoke butt parts
The electromagnet device according to the present invention is completed by firmly tightening the upper and lower electromagnets by interposing a spacer 6 made of %Ni--Fe alloy. The electromagnet device according to the present invention has the above-described structure, and since the upper electromagnet A and the lower electromagnet B are arranged symmetrically, the parallelism of the magnetic poles can be easily obtained and the design height of the gap 1 of the main yoke can be adjusted. If ring-shaped spacers 6 of the same height are inserted in contact with the upper and lower return yokes, the magnetic gap between the upper and lower yokes can be formed extremely accurately. Furthermore, this spacer is made of a 35 at% Ni--Fe alloy and has a thermal expansion coefficient of I.times.10.sup.-6, which is significantly smaller than the 15.times.10-6 of a yoke or return yoke made of an iron core. FIG. 2 shows another embodiment of the present invention in which a ring-shaped centering yoke 8 made of carbon steel is inserted and tightened around the outer periphery of the spacer 6.
このような構造で高さ15副外径16.5cIn中心の
ギャップ間隔111R1Eとした最大2,200ガウス
を発生する電磁石でヨーク中心5寵φでの磁場内で±2
X 10−5の均一度を得た。またこれを間磁力計に
組込んだところ経時的安定度は第4図に示す如< 1
ppm以下のものが得られた。With this structure, the height is 15, the secondary outer diameter is 16.5cIn, the gap distance is 111R1E at the center, and the electromagnet generates a maximum of 2,200 Gauss.
A uniformity of X 10-5 was obtained. In addition, when this was incorporated into a magnetometer, the stability over time was as shown in Figure 4.
ppm or less was obtained.
以上本発明について説明したが1本発明によればヨーク
間のギャップの平行度の良好なものが得られる他、その
ギャップ間隔を得るためのスペーサを熱膨張係数が純鉄
よシ大幅に小さい35〜36% Ni −Fe合金所謂
インバー合金を用いることによって空間的均一度および
経時的安定度を著しく改善することができた。The present invention has been described above.1 According to the present invention, not only can the gap between the yokes have good parallelism, but also the spacer for obtaining the gap distance has a coefficient of thermal expansion that is significantly smaller than that of pure iron35. ~36% By using a Ni-Fe alloy, the so-called Invar alloy, it was possible to significantly improve spatial uniformity and stability over time.
第1図は本発明の1実施例を°示す(、)は断面図(b
)は上面斜視図、第2図は本願発明の他の実施例を示す
。左手分は右手分と同形なので断面は省略する。
第3図は従来の電磁石装置の概略図で(a)百断面図、
(b)は側面図を示す。第4図は本発明を蘭磁力計に組
み込んで測定したときの経時的安定度を示す。
図において
l:ギャップ、2.2:主ヨーク、4.4’:コイル、
5,5’:リターンコイル、6:スペーサ。
7二ぎルト、8:芯出しヨーク。
第1図
第2図
Z′Figure 1 shows one embodiment of the present invention (,) is a sectional view (b).
) is a top perspective view, and FIG. 2 shows another embodiment of the present invention. The left hand part has the same shape as the right hand part, so the cross section is omitted. Figure 3 is a schematic diagram of a conventional electromagnetic device; (a) sectional view;
(b) shows a side view. FIG. 4 shows the stability over time when the present invention was incorporated into a Lan magnetometer and measured. In the figure, l: gap, 2.2: main yoke, 4.4': coil,
5, 5': return coil, 6: spacer. 72 gilt, 8: Centering yoke. Figure 1 Figure 2 Z'
Claims (1)
周に嵌装されたリング状のリターンヨークと前記主ヨー
クの突部とリターンヨークの間に挿入されたコイルとよ
りなる電磁石2個を前記リング状の2個のリターンヨー
クの間に低熱膨張係数を有する磁性合金よりなるスペー
サを介在させて突き合せ前記2個の電磁石の間にギャッ
プを構成せしめたことを特徴とする電磁石装置。 2、前記スペーサは熱膨張係数が1×10^−^6以下
である特許請求の範囲第1項記載の電磁石装置。 3、前記スペーサは36%Ni−Fe合金である特許請
求の範囲第1項記載の電磁石装置。[Claims] 1. A cylindrical main yoke with a convex cross section, a ring-shaped return yoke fitted around the outer periphery of the main yoke, and a ring-shaped return yoke inserted between the protrusion of the main yoke and the return yoke. A gap is formed between the two electromagnets by interposing a spacer made of a magnetic alloy having a low coefficient of thermal expansion between the two ring-shaped return yokes and interposing two electromagnets each consisting of a coil. An electromagnetic device featuring: 2. The electromagnet device according to claim 1, wherein the spacer has a coefficient of thermal expansion of 1×10^-^6 or less. 3. The electromagnet device according to claim 1, wherein the spacer is a 36% Ni-Fe alloy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60062136A JPS61222208A (en) | 1985-03-28 | 1985-03-28 | Electromagnet apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60062136A JPS61222208A (en) | 1985-03-28 | 1985-03-28 | Electromagnet apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61222208A true JPS61222208A (en) | 1986-10-02 |
Family
ID=13191364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60062136A Pending JPS61222208A (en) | 1985-03-28 | 1985-03-28 | Electromagnet apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61222208A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6340888B1 (en) | 1998-09-02 | 2002-01-22 | Sumitomo Special Metals Co., Ltd. | Magnetic field generator for MRI |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614145A (en) * | 1979-07-16 | 1981-02-10 | Jeol Ltd | Magnet unit for nuclear magnetic resonator or the like |
-
1985
- 1985-03-28 JP JP60062136A patent/JPS61222208A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5614145A (en) * | 1979-07-16 | 1981-02-10 | Jeol Ltd | Magnet unit for nuclear magnetic resonator or the like |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6340888B1 (en) | 1998-09-02 | 2002-01-22 | Sumitomo Special Metals Co., Ltd. | Magnetic field generator for MRI |
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