JPH03175604A - High-temperature superconductive permanent magnet - Google Patents
High-temperature superconductive permanent magnetInfo
- Publication number
- JPH03175604A JPH03175604A JP31602989A JP31602989A JPH03175604A JP H03175604 A JPH03175604 A JP H03175604A JP 31602989 A JP31602989 A JP 31602989A JP 31602989 A JP31602989 A JP 31602989A JP H03175604 A JPH03175604 A JP H03175604A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnet
- critical
- permanent magnet
- superconductive
- 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
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims 2
- 239000002887 superconductor Substances 0.000 abstract description 10
- 230000004907 flux Effects 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract 1
- 230000005284 excitation Effects 0.000 description 9
- 230000002085 persistent effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002595 magnetic resonance imaging Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
この発明は高温超電導永久磁石、例えば磁気共鳴イメー
ジング等に用いられる高温超電導永久磁石に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a high temperature superconducting permanent magnet, for example, a high temperature superconducting permanent magnet used for magnetic resonance imaging and the like.
［従来の技術］
第３図は、例えば特開昭６１−４９４０３号公報に示さ
れた従来の超電導磁石を示す断面図であり、図において
（１）は超電導磁石、（２）は永久電流スイッチ、（３
）は電流リードである。[Prior Art] Fig. 3 is a sectional view showing a conventional superconducting magnet disclosed in, for example, Japanese Patent Application Laid-Open No. 61-49403, in which (1) is a superconducting magnet and (2) is a persistent current switch. ,(3
) is the current lead.
超電導永久磁石は永久電流スイッチを用い、外部電源よ
り所定の磁界まで励磁している。しかし、永久電流スイ
ッチを用いる場合、超電導線端部に、超電導接続が必要
であり、また、任意の磁界分布を得るために超電導線を
種々の形状に巻線し、それぞれに永久電流スイッチを設
け、個々に励磁する必要がある。Superconducting permanent magnets use persistent current switches and are excited to a predetermined magnetic field by an external power source. However, when using a persistent current switch, a superconducting connection is required at the end of the superconducting wire, and in order to obtain an arbitrary magnetic field distribution, the superconducting wire is wound into various shapes, and a persistent current switch is attached to each. , must be individually excited.
［発明が解決しようとする課題］
従来の超電導永久磁石は、以上のように永久電流スイッ
チを用い、外部電源より所定の磁界まで励磁していたの
で、超電導線端部において、超電導接続が必要であり、
また、任意の磁界分布を得るために超電導線を種々の形
状に巻線し、それぞれに永久電流スイッチを設け、個々
に励磁をするため複雑な作業を必要とするという課題が
あった。[Problem to be solved by the invention] Conventional superconducting permanent magnets use persistent current switches as described above and are excited to a predetermined magnetic field from an external power supply, so superconducting connections are required at the ends of superconducting wires. can be,
Another problem was that in order to obtain an arbitrary magnetic field distribution, superconducting wires were wound into various shapes, each with a persistent current switch, and complicated work required to excite each one individually.
この発明は、上記のような課題を解決するためになされ
たもので、永久電流スイッチを必要とせず、−度の励磁
作業で任意の磁界分布を得ることを目的とする。This invention was made to solve the above-mentioned problems, and aims to obtain an arbitrary magnetic field distribution with -degree excitation work without requiring a persistent current switch.
［課題を解決するための手段］
この発明に係る高温Ｍ電導永久磁石は、高温超電導永久
磁石を冷却後に臨界磁界の２倍以上の外部磁界を印加す
ることにより、臨界状態で励磁するようにしたものであ
る。[Means for Solving the Problems] The high-temperature superconducting permanent magnet according to the present invention is made to be excited in a critical state by applying an external magnetic field that is twice or more of the critical magnetic field after cooling the high-temperature superconducting permanent magnet. It is something.
［作用］
この発明における高温超電導永久磁石は、磁石が任意形
状に一体化成形されているため、巻線工程が無くなり超
電導接続が不要である。また、臨界状態で励磁するため
、臨界磁界の２倍以上の外部磁界を印加するだけの単純
な作業でよく、高温超電導体内はほぼ均一な電流分布を
有するので、任意形状に加工することにより任意の磁界
分布を得ることができる。[Function] In the high temperature superconducting permanent magnet of the present invention, since the magnet is integrally molded into an arbitrary shape, there is no need for a winding process and no superconducting connection is required. In addition, since the magnetization is carried out in a critical state, it is only necessary to apply an external magnetic field that is twice or more than the critical magnetic field, and since the high-temperature superconductor has a nearly uniform current distribution, it can be processed into any desired shape. magnetic field distribution can be obtained.
［実施例ゴ 以下、この発明の一実施例を図について説明する。[Example Go An embodiment of the present invention will be described below with reference to the drawings.
第１図はこの発明の一実施例を示す断面図であり、図に
おいて、（１）は例えばイツトリウム系酸化物超電導体
からなる超電導磁石、（４）は励磁用磁石である。FIG. 1 is a sectional view showing one embodiment of the present invention, in which (1) is a superconducting magnet made of, for example, a yttrium-based oxide superconductor, and (4) is an excitation magnet.
次に具体的な実施例の励磁方法について説明する。先ず
、超電導磁石を臨界温度（例えばイツトリウム系酸化物
の場合９５Ｋ）以下に冷却したのち、第２図のように外
部磁界をＪより増加させると臨界磁界Ｂｅｌ：により超
電導磁石内部に磁束が侵入しはじめる。さらに磁界を増
加させＢｅｌの約２倍Ｂｅ２： Ｌ”’Ｑ超電導体全体
が臨界状態になり、均一な超電導電流が流れている。こ
の状態より外部磁界をゼロまで減少させても、超電１ｆ
ｆＱ石内部に侵入した磁束はほとんど減少せずに閉じ込
められる（Ｎ）。また、第２図に示すように、Ｂｅ２を
越える外部磁界を印加しても、同じ効果が得られること
から、励磁時の外部磁界は精度の無いものでも良い。ま
た、外部磁界がゼロになった状態で励磁用の磁石（４）
は取り外しても良い。Next, the excitation method of a specific example will be explained. First, after cooling the superconducting magnet to below the critical temperature (for example, 95 K in the case of yttrium oxide), when the external magnetic field is increased from J as shown in Figure 2, magnetic flux invades the inside of the superconducting magnet due to the critical magnetic field Bel:. Start. By further increasing the magnetic field, the entire Be2:L"'Q superconductor enters a critical state, which is about twice as high as Bel, and a uniform superconducting current flows. Even if the external magnetic field is reduced from this state to zero, the superconductor 1f
The magnetic flux that has entered the inside of the fQ stone is confined with almost no reduction (N). Further, as shown in FIG. 2, the same effect can be obtained even if an external magnetic field exceeding Be2 is applied, so the external magnetic field during excitation may not be accurate. Also, when the external magnetic field is zero, the excitation magnet (4)
may be removed.
なお、この発明に係る高温超電導体はイツトリウム系に
限らず、例えばビスマス系、タリウム系などの他の酸化
物超電導体、または、ニオブ系の金属系超電導体であっ
てもよく、上記実施例と同様の効果を奏する。The high-temperature superconductor according to the present invention is not limited to yttrium-based superconductors, but may be other oxide superconductors such as bismuth-based or thallium-based, or niobium-based metal superconductors. It has a similar effect.
また、励磁方法として磁界をかけた状態で超電導磁石を
冷却し磁束を閉じ込める方法を用いてもよく、上記実施
例と同様の効果を奏する。Further, as an excitation method, a method may be used in which the superconducting magnet is cooled while a magnetic field is applied to confine the magnetic flux, and the same effect as in the above embodiment can be obtained.
［発明の効果コ
以上のように、この発明によれば、超電導永久磁石を一
体化成形したので、任意の形状を容易に得ることができ
、励磁作業及び装置が簡単になる効果がある。[Effects of the Invention] As described above, according to the present invention, since the superconducting permanent magnet is integrally molded, any shape can be easily obtained, and the excitation work and device are simplified.
第１図はこの発明の一実施例による高温超電導永久磁石
を示す断面図、第２図はこの発明の一実施例の励磁方法
を説明するための外部磁界−磁石内部磁界特性を示す特
性図、第３図は従来の超電導永久磁石を示す断面図であ
る。
図において、（１）は超電導磁石、（２）は永久電流ス
イ゛ツチ、（３）は電流リード、（４）は励磁用磁石で
ある。
なお、各図中、同一符号は同一または相当部分を示す。FIG. 1 is a cross-sectional view showing a high-temperature superconducting permanent magnet according to an embodiment of the present invention, and FIG. 2 is a characteristic diagram showing external magnetic field-magnet internal magnetic field characteristics for explaining the excitation method of an embodiment of the present invention. FIG. 3 is a sectional view showing a conventional superconducting permanent magnet. In the figure, (1) is a superconducting magnet, (2) is a persistent current switch, (3) is a current lead, and (4) is an excitation magnet. In each figure, the same reference numerals indicate the same or corresponding parts.
Claims (1)
温超電導永久磁石において、この高温超電導永久磁石を
冷却後に、臨界磁界の２倍以上の外部磁界を印加するこ
とにより、臨界状態で励磁することを特徴とする高温超
電導永久磁石。In a high-temperature superconducting permanent magnet formed into an arbitrary shape by integral molding or split molding, the high-temperature superconducting permanent magnet is excited in a critical state by applying an external magnetic field more than twice the critical magnetic field after cooling. A high-temperature superconducting permanent magnet characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31602989A JPH03175604A (en) | 1989-12-04 | 1989-12-04 | High-temperature superconductive permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31602989A JPH03175604A (en) | 1989-12-04 | 1989-12-04 | High-temperature superconductive permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03175604A true JPH03175604A (en) | 1991-07-30 |
Family
ID=18072460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31602989A Pending JPH03175604A (en) | 1989-12-04 | 1989-12-04 | High-temperature superconductive permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03175604A (en) |
-
1989
- 1989-12-04 JP JP31602989A patent/JPH03175604A/en active Pending
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