JPH0746647B2 - Magnetic field generator - Google Patents
Magnetic field generatorInfo
- Publication number
- JPH0746647B2 JPH0746647B2 JP59122267A JP12226784A JPH0746647B2 JP H0746647 B2 JPH0746647 B2 JP H0746647B2 JP 59122267 A JP59122267 A JP 59122267A JP 12226784 A JP12226784 A JP 12226784A JP H0746647 B2 JPH0746647 B2 JP H0746647B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- coil
- field generating
- magnetic
- solenoid type
- 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.)
- Expired - Lifetime
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)
- Electromagnets (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はソレノイド型磁界発生コイルを用いて磁界を発
生する装置に関するものである。更に詳しく述べれば、
発生磁界を強化することを可能とした構造を有する磁界
発生装置に関するものである。The present invention relates to an apparatus for generating a magnetic field using a solenoid type magnetic field generating coil. More specifically,
The present invention relates to a magnetic field generator having a structure capable of strengthening a generated magnetic field.
（従来技術とその問題点） 表面に垂直な強い一軸性磁気異方性を有する磁性材料薄
片中に存在する磁気バブルを利用した磁気バルブ素子に
於いては、通常磁気バブルを安定に保持する目的のため
に、磁性材料薄片に垂直なバブル保持磁界（以下バイア
ス磁界と称する）が必要である。バイアス磁界を発生す
るには、永久磁石を用いる方法やソレノイド型中空コイ
ルを用いる方法がよく知られている。特に、磁気バブル
素子の諸特性を測定・評価する際には、前記バイアス磁
界を変化させることが重要である。従ってこの目的のた
めには、バイアス磁界の発生は、印加する電流値で自由
に強度が変えられるソレノイド型コイルを用いるのが一
般的である。(Prior art and its problems) In a magnetic valve element using a magnetic bubble existing in a thin piece of magnetic material having a strong uniaxial magnetic anisotropy perpendicular to the surface, the purpose of normally maintaining a stable magnetic bubble Therefore, a bubble holding magnetic field (hereinafter referred to as a bias magnetic field) perpendicular to the magnetic material thin film is required. For generating a bias magnetic field, a method using a permanent magnet and a method using a solenoid type hollow coil are well known. In particular, it is important to change the bias magnetic field when measuring and evaluating various characteristics of the magnetic bubble element. Therefore, for this purpose, the generation of the bias magnetic field is generally performed by using a solenoid type coil whose strength can be freely changed by the applied current value.
一方、磁気バブル素子、特に磁気バブルを情報の担体と
して利用する磁気バブルメモリ素子では情報の高密度化
のために、用いる磁気バブルの径を微小化することが行
なわれてきた。磁気バブルを微小化するに伴って、一般
にはその磁性材料の飽和磁化Msを大きくする必要があ
る。飽和磁化が大きくなると、これに従って磁気バブル
を安定に保持するバイアス磁界も大きくなる。例えば、
磁性材料として磁性ガーネット膜を用いた場合、磁気バ
ブル直径が３μｍ程度のときはバイアス磁界としては、
150Oe程度であったのが、２μｍ直径の磁気バブルを保
持するバイアス磁界は約250Oe、１μｍ直径に対しては3
50Oe程度必要とする。更に0.5μｍ直径の磁気バブルを
安定に保持するには600Oe程度のバイアス磁界が必要と
なる。On the other hand, in a magnetic bubble element, particularly in a magnetic bubble memory element that uses a magnetic bubble as a carrier for information, the diameter of the magnetic bubble used has been miniaturized in order to increase the density of information. With the miniaturization of magnetic bubbles, it is generally necessary to increase the saturation magnetization Ms of the magnetic material. As the saturation magnetization increases, the bias magnetic field that stably holds the magnetic bubble also increases accordingly. For example,
When a magnetic garnet film is used as the magnetic material, and the magnetic bubble diameter is about 3 μm, the bias magnetic field is
Although it was about 150 Oe, the bias magnetic field that holds the magnetic bubbles of 2 μm diameter is about 250 Oe and 3
Needs about 50 Oe. Further, a bias magnetic field of about 600 Oe is required to stably hold a 0.5 μm diameter magnetic bubble.
この様に、微小磁気バブルを利用した磁気バブル素子を
評価するには、高いバイアス磁界が必要とされる。高い
バイアス磁界を発生するには、磁界発生コイルに大きな
電流を印加すれば良いが、単純なコイルではコイルに発
生するジュール熱は電流値の自乗に比例するため、バイ
アス磁界の上昇に伴い急激にコイルの温度が上昇し、安
定に磁気バブル素子の評価・測定が行なえなくなる欠点
を有している。As described above, a high bias magnetic field is required to evaluate a magnetic bubble element using a minute magnetic bubble. In order to generate a high bias magnetic field, it is sufficient to apply a large current to the magnetic field generating coil, but with a simple coil, the Joule heat generated in the coil is proportional to the square of the current value, so it rapidly increases as the bias magnetic field rises. There is a drawback that the temperature of the coil rises and stable evaluation and measurement of the magnetic bubble element cannot be performed.
（発明の目的） 本発明の目的は、上記の欠点を取り除くため、ソレノイ
ド型磁界発生コイルで発生する磁界の単位電流当りの強
度を大きくすることにより、同一発生磁界に要する印加
電流値を下げ、コイルの発熱を抑制する磁界発生装置を
提供することにある。(Object of the invention) In order to eliminate the above drawbacks, the object of the present invention is to increase the strength per unit current of the magnetic field generated in the solenoid type magnetic field generating coil, thereby lowering the applied current value required for the same generated magnetic field, It is to provide a magnetic field generation device that suppresses heat generation of a coil.
（発明の構成） 上記目的を達成するために、本発明は、中空のソレノイ
ド型磁界発生コイルを２個、コイル間隙を設けて、対置
したヘルムホルツ型磁界発生コイルを有し、前記２個の
中空のソレノイド型磁界発生コイルの外側面に前記２個
の中空のソレノイド型磁界発生コイルと中心軸を共有す
る高透磁率軟強磁性体円筒状枠材を１個設け、前記高透
磁率軟強磁性体円筒状枠材の前記コイル間隙に対応する
個所の一部に開孔を設けたものである。(Structure of the Invention) In order to achieve the above object, the present invention has two hollow solenoid type magnetic field generating coils, and a Helmholtz type magnetic field generating coil opposed to each other with a coil gap provided therebetween. On the outer surface of the solenoid type magnetic field generating coil, one high permeability soft ferromagnetic cylindrical frame member sharing the central axis with the two hollow solenoid type magnetic field generating coils is provided. An opening is provided in a part of a portion corresponding to the coil gap of the body cylindrical frame member.
（構成の詳細な説明） 本発明は、上述の構成をとることにより、従来技術の欠
点を克服するものである。一般に、第１図に示す様にソ
レノイド型磁界発生コイル１に電流を印加して、磁界を
発生させると、ソレノイド型磁界発生コイル１の中空部
12では中心軸に沿って一方向の磁界21が発生する。磁束
の連続性の一般原理に基き、このソレノイド型磁界発生
コイル１の外側には、中空部12での磁界方向と逆向きの
磁界が広く分布して存在している。本発明の原理は、こ
の外側に広く分布して存在する磁束を、ソレノイド型磁
界発生コイル１の外側に設けた高透磁率軟強磁性体円筒
状枠材に吸収させることによりこの高透磁率軟強磁性体
円筒状枠材をソレノイド型磁界発生コイル１の外の磁界
方向に磁化させ、その磁化の分だけ磁束密度を増大させ
て、ソレノイド型磁界発生コイル１内の磁界をも増強さ
せることにある。(Detailed Description of Configuration) The present invention overcomes the drawbacks of the prior art by adopting the above configuration. Generally, when a current is applied to the solenoid type magnetic field generating coil 1 to generate a magnetic field as shown in FIG.
At 12, a unidirectional magnetic field 21 is generated along the central axis. Based on the general principle of magnetic flux continuity, a magnetic field opposite to the magnetic field direction in the hollow portion 12 is widely distributed outside the solenoid type magnetic field generating coil 1. The principle of the present invention is that the magnetic flux existing widely distributed on the outer side is absorbed by the high-permeability soft ferromagnetic cylindrical frame material provided on the outer side of the solenoid-type magnetic field generating coil 1, so that the high-permeability soft The ferromagnetic cylindrical frame material is magnetized in the magnetic field direction outside the solenoid type magnetic field generating coil 1, and the magnetic flux density is increased by the amount of the magnetization to enhance the magnetic field in the solenoid type magnetic field generating coil 1. is there.
第２図を用いて本発明の原理を説明する。第２図では、
ソレノイド型磁界発生コイル1a,1bを中心軸を共有して
コイル間隙20を隔てて対置したヘルムホルツ型磁界発生
コイルの外側に、高透磁率軟強磁性体円筒状枠材2a,2b
を設けてある。磁界を印加すべき試料５は、このヘルム
ホルツ型磁界発生コイルのコイル間隙20の中央に置く。
ソレノイド型磁界発生コイル1a,1bに、磁界発生用電流
を通じると、ソレノイド型磁界発生コイル1a,1bにより
発生するコイル外の磁束は、前述の如く高透磁率軟強磁
性体円筒状枠材2a,2bに吸収され、これにより、高透磁
率軟強磁性体円筒状枠材2a,2bは磁化方向３に示す方向
に磁化される。この磁化により磁束は増加し、これがソ
レノイド型磁界発生コイル1a,1b内の磁束21に加わり、
ソレノイド型磁界発生コイル1a,1b内の磁束密度即ち、
磁界強度が増大する。The principle of the present invention will be described with reference to FIG. In Figure 2,
On the outside of the Helmholtz type magnetic field generating coil in which the solenoid type magnetic field generating coils 1a and 1b are opposed to each other with the central axis shared and the coil gap 20 is provided, the high permeability soft ferromagnetic cylindrical frame members 2a and 2b are provided.
Is provided. The sample 5 to which a magnetic field is applied is placed in the center of the coil gap 20 of this Helmholtz type magnetic field generating coil.
When a magnetic field generating current is passed through the solenoid type magnetic field generating coils 1a and 1b, the magnetic flux outside the coils generated by the solenoid type magnetic field generating coils 1a and 1b is the high permeability soft ferromagnetic cylindrical frame member 2a as described above. , 2b, whereby the high-permeability soft ferromagnetic cylindrical frame members 2a, 2b are magnetized in the direction indicated by the magnetization direction 3. This magnetization increases the magnetic flux, which adds to the magnetic flux 21 in the solenoid type magnetic field generating coils 1a and 1b,
Magnetic flux density in the solenoid type magnetic field generating coils 1a, 1b,
The magnetic field strength increases.
具体的には、ソレノイド型磁界発生コイル1a又は1bの寸
法が内径32mm、外径95mm、厚さが15mmでコイル間隙20の
大きさが16mmの場合、肉厚3mmのNiZn磁性フェライトか
らなる高透磁率軟強磁性体円筒状枠材2a,2bを設ける
と、これがない場合に比べて、同じ印加電流値で約10％
の発生磁界の増大がみられた。換言すれば、同じ磁界強
度を得るには約10％少ない電流でよく、このために消費
電力は約20％減少する。Specifically, when the solenoid type magnetic field generating coil 1a or 1b has an inner diameter of 32 mm, an outer diameter of 95 mm and a thickness of 15 mm and the coil gap 20 has a size of 16 mm, a high permeability of 3 mm thick NiZn magnetic ferrite is used. When the magnetic susceptibility soft ferromagnetic cylindrical frame materials 2a and 2b are provided, it is about 10% at the same applied current value compared to the case without this.
An increase in the magnetic field generated by was observed. In other words, about 10% less current is needed to achieve the same magnetic field strength, which reduces power consumption by about 20%.
（実施例） 次に本発明の実施例を第３図（Ａ），（Ｂ）を用いて説
明する。第３図（Ａ）は本実施例の立面図、第３図
（Ｂ）は平面図である。本実施例の磁界発生コイルとし
ては第１の実施例と同様に、ソレノイド型磁界発生コイ
ル1a,1bを対置したヘルムホルツ型磁界発生コイルを用
いている。高透磁率軟強磁性体円筒状枠材２は、ヘルム
ホルツ型磁界発生コイルの外側全体を覆っている。試料
５の取り出し等の便宜のため、高透磁率軟強磁性体円筒
状枠材２はその一部にヘルムホルツ型磁界発生コイルの
コイル間隙20に対応して開孔2cがあけられている。(Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS. 3 (A) and 3 (B). FIG. 3A is an elevational view of this embodiment, and FIG. 3B is a plan view. As the magnetic field generating coil of the present embodiment, a Helmholtz type magnetic field generating coil in which solenoid type magnetic field generating coils 1a and 1b are opposed to each other is used as in the first embodiment. The high permeability soft ferromagnetic cylindrical frame member 2 covers the entire outside of the Helmholtz type magnetic field generating coil. For convenience of taking out the sample 5 and the like, the high-permeability soft ferromagnetic cylindrical frame member 2 is provided with an opening 2c at a part thereof corresponding to the coil gap 20 of the Helmholtz type magnetic field generating coil.
本実施例では、コイル間隙20も殆んど高透磁率軟強磁性
体円筒状枠材２で橋絡されているため、コイル間隙20で
の磁束の高透磁率軟強磁性体円筒状枠材２の外へのにじ
み出しのロスが減少し、そのために高透磁率軟強磁性体
円筒状枠材２の磁化は一層大きくなり、同一電流での発
生磁界強度が更に増加する。In this embodiment, since the coil gap 20 is also almost bridged by the high permeability soft ferromagnetic cylindrical frame member 2, the high permeability soft ferromagnetic cylindrical frame member of the magnetic flux in the coil gap 20 is used. The loss of bleeding out of No. 2 to the outside is reduced, so that the magnetization of the high permeability soft ferromagnetic cylindrical frame member 2 is further increased, and the strength of the generated magnetic field at the same current is further increased.
（発明の効果） 以上に述べた様に、本発明を用いれば、単位電流あたり
の発生磁界強度が大きく、従って同じ磁界強度では、ソ
レノイド型磁界発生コイルの部分での消費電力の少ない
磁界発生装置が実現される。本発明の高透磁率軟強磁性
体円筒状枠材としては、前述の高透磁率を有する磁性フ
ェライトのみならず、パーマロイの如き高透磁率金属材
料を用いても本発明の効果を容易に得られることは、そ
の原理からみて当然である。(Effects of the Invention) As described above, according to the present invention, the magnetic field strength generated per unit current is large, and therefore, with the same magnetic field strength, the magnetic field generation device consumes less power in the solenoid type magnetic field generation coil. Is realized. The high-permeability soft ferromagnetic cylindrical frame material of the present invention is not limited to the above-mentioned magnetic ferrite having a high magnetic permeability, and the effects of the present invention can be easily obtained by using a high-permeability metal material such as permalloy. It is natural to be seen from the principle.
第１図及び第２図は本発明の原理を説明する図、第３図
（Ａ），（Ｂ）は本発明の実施例を示す図である。 図に於いて、 1,1a,1bはソレノイド型磁界発生コイル、2,2a,2bは高透
磁率軟強磁性体円筒状枠材、2cは開孔、３は磁化方向、
５は試料、12は中空部分、20はコイル間隙、21は磁束で
ある。1 and 2 are diagrams for explaining the principle of the present invention, and FIGS. 3 (A) and 3 (B) are diagrams showing an embodiment of the present invention. In the figure, 1,1a, 1b are solenoid type magnetic field generating coils, 2,2a, 2b are high permeability soft ferromagnetic cylindrical frame members, 2c are apertures, 3 is the magnetization direction,
5 is a sample, 12 is a hollow part, 20 is a coil gap, and 21 is a magnetic flux.
Claims (2)
個、コイル間隙を設けて、対置したヘルムホルツ型磁界
発生コイルを有し、前記２個の中空のソレノイド型磁界
発生コイルの外側面に前記２個の中空のソレノイド型磁
界発生コイルと中心軸を共有する高透磁率軟強磁性体円
筒状枠材を１個設け、前記高透磁率軟強磁性体円筒状枠
材の前記コイル間隙に対応する個所の一部に開孔を設け
たことを特徴とする磁界発生装置。1. A hollow solenoid type magnetic field generating coil comprising two coils.
Each has a Helmholtz type magnetic field generating coil opposed to each other with a coil gap provided, and shares the central axis with the two hollow solenoid type magnetic field generating coils on the outer surface of the two hollow solenoid type magnetic field generating coils. One of the high permeability soft ferromagnetic cylindrical frame members is provided, and an opening is provided at a part of the high permeability soft ferromagnetic cylindrical frame member corresponding to the coil gap. Magnetic field generator.
トで構成されている特許請求の範囲第１項記載の磁界発
生装置。2. The magnetic field generator according to claim 1, wherein the high permeability soft ferromagnetic cylindrical frame member is made of ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59122267A JPH0746647B2 (en) | 1984-06-14 | 1984-06-14 | Magnetic field generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59122267A JPH0746647B2 (en) | 1984-06-14 | 1984-06-14 | Magnetic field generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS612306A JPS612306A (en) | 1986-01-08 |
| JPH0746647B2 true JPH0746647B2 (en) | 1995-05-17 |
Family
ID=14831725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59122267A Expired - Lifetime JPH0746647B2 (en) | 1984-06-14 | 1984-06-14 | Magnetic field generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0746647B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0680821B2 (en) * | 1989-05-01 | 1994-10-12 | 株式会社東芝 | High sensitivity triac |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5517345B2 (en) * | 1972-02-17 | 1980-05-10 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5517345U (en) * | 1978-07-21 | 1980-02-04 |
-
1984
- 1984-06-14 JP JP59122267A patent/JPH0746647B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5517345B2 (en) * | 1972-02-17 | 1980-05-10 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS612306A (en) | 1986-01-08 |
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