JPS61215974A - Magnetic core for magnetic sensor - Google Patents

Abstract

PURPOSE:To improve the sensitivity, permeability and response for the high frequency by fixing the twisted cable of plural amorphous magnetic alloy wires with adhesives, inserting plural cables into a non-magnetic microtube and fixing with the adhesives. CONSTITUTION:A cable 1 is formed by twisting plural amorphous magnetic alloy wires. Next, the cable 1 wound to a cable drum 2 is extended and shifted by adding the force in the shaft direction by a pinch roll 3 and a take-out roll 6. By an adhesives alloying machine 4, the adhesives are applied, dried and fixed by a lamp 5 for drying, the rigid and rod-shaped cable 1 is cut to the prescribed length with a cutter 7 and a fixing cable 8 is formed. Further, plural cables 8 are inserted to a non-magnetic microtube, fixed with the adhesives, and the magnetic core for the magnetic sensor. Since the magnetic core is composed of the amorphous magnetic alloy, the core has high sensitivity, high permeability and high response for high frequency, and the characteristic change for the temperature change is also small, and therefore, temperature compensation goes to be unnecessary.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、計測用の磁気センサに用いられる磁気センサ
用磁心に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic core for a magnetic sensor used in a magnetic sensor for measurement.

〔従来の技術〕[Conventional technology]

従来、磁気センナ用磁心としては、パーマロイ（商標名
）とフェライトが多く使用されている。Conventionally, Permalloy (trade name) and ferrite are often used as magnetic cores for magnetic sensors.

パーマロイは切削による加工で、フェライトは焼結して
、円筒状に形成し、両端にネジをきり、他の部材と締結
、連動させて使用していた。Permalloy was processed by cutting, and ferrite was sintered and formed into a cylindrical shape, with threads cut at both ends and used by fastening and interlocking with other parts.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし、ト述のパーマロイは感度は高いが、透磁性およ
び高周波に対する応答性が低く高周波に使用できないと
いう特性を有する。However, although the above-mentioned permalloy has high sensitivity, it has low magnetic permeability and low responsiveness to high frequencies, making it unusable for high frequencies.

また、フェライトは高周波に対する応答性が高いが透磁
性および感度が低く、また温度変化によ・る特性変化が
大きく温度補償を必要とする問題点がある。Further, although ferrite has high responsiveness to high frequencies, it has low magnetic permeability and sensitivity, and also has the problem that its characteristics change greatly due to temperature changes, requiring temperature compensation.

本発明はヒ述の問題点を解決するために提案されたもの
で、感度が高く、透磁性および高周波に対して応答性が
高く、温度変化に安定的な磁気センサ用磁心を提供する
ことを目的とする。The present invention was proposed in order to solve the above-mentioned problems, and aims to provide a magnetic core for a magnetic sensor that has high sensitivity, high magnetic permeability and high frequency response, and is stable against temperature changes. purpose.

〔問題点を解決するための手段〕[Means for solving problems]

本発明者等が鋭意研究の結果、アモルファス磁性合金は
感度が高く、高周波に対して応答性が良く、温度変化に
安定的であるということを知見した。As a result of extensive research, the present inventors have found that amorphous magnetic alloys have high sensitivity, good responsiveness to high frequencies, and are stable against temperature changes.

しかし、アモルファス磁性合金はその生成過程から、リ
ボンと称される厚さ３０〜４０ｇｍの薄帯と０．１８φ
ｍｍ以下のワイヤしか得られない特性を有する。However, due to its production process, amorphous magnetic alloys consist of thin strips with a thickness of 30 to 40 gm, called ribbons, and 0.18 φ
It has characteristics that can only be obtained with wires of mm or less.

このため剛性がなく、微小なためこのワイヤを磁心とし
て使用することは取扱いが困難である。Because of this, it lacks rigidity and is so small that it is difficult to use this wire as a magnetic core.

特に、ワイヤは径は一定であり、エツジ効果がないとい
う特徴を有するが、ワイヤを磁心として使用する場合、
単線では感度が不足し、素線を束ねて磁心体積を増やし
て感度を増加させることが必要である。In particular, wire has a constant diameter and has no edge effect, but when wire is used as a magnetic core,
A single wire lacks sensitivity, and it is necessary to increase the sensitivity by bundling the wires to increase the volume of the magnetic core.

また、磁心として使用する場合、端面を揃えて同じ長さ
のものを束ねる必要があるが、０．ｌｔｂ　ｍ　ｍ程度
のものを複数本を束ねて使用することは、微細、軽量で
取扱いが難しい。Also, when using it as a magnetic core, it is necessary to bundle pieces of the same length with their end faces aligned, but 0. It is difficult to use a plurality of pieces of about ltbmm in size in a bundle because they are small and lightweight.

しかし、Ｉ：述のように素線ワイヤは剛性なく、軽いた
め、単純に束ねることが困難である。However, I: As mentioned above, bare wires have no rigidity and are light, so it is difficult to simply bundle them.

そこで、先に複数本撚り合せたケーブルを作成し、これ
を取り扱うことを考えた。Therefore, I first thought of creating a cable by twisting multiple strands together and handling this cable.

本発明は上述の知見に基づいて成立するもので、複数本
のアモルファス磁性合金ワイヤを撚り合わせてケーブル
とし、該ケーブルを接着剤で固着し、該固着ケーブルを
非磁性マイクロチューブに複数本挿入し、接着剤で固着
したものである。The present invention was established based on the above-mentioned knowledge, and involves twisting a plurality of amorphous magnetic alloy wires together to form a cable, fixing the cable with adhesive, and inserting a plurality of the fixed cables into a non-magnetic microtube. , fixed with adhesive.

〔作用〕[Effect]

次に、本発明の作用について説明すると、アモルファス
磁性合金から成るためその特性は高感度、高透磁性およ
び高周波に対する高応答性であり、また、温度変化に対
する特性変化が小さく温度補償を不要とする。Next, to explain the operation of the present invention, since it is made of an amorphous magnetic alloy, its characteristics are high sensitivity, high magnetic permeability, and high responsiveness to high frequencies.In addition, the characteristics change due to temperature changes are small and temperature compensation is not required. .

さらに、高透磁性であるためインダクタンスが大きくな
るのでコイル巻数が少なくて済みコイル外径が小さく、
さらに、細いアモルファス磁性合金から成るため磁心外
径も小さくなるためセンサ外径も小さくでき、小型軽量
化が可能である。Furthermore, since it has high magnetic permeability, the inductance increases, so the number of turns of the coil is small, and the outer diameter of the coil is small.
Furthermore, since it is made of a thin amorphous magnetic alloy, the outer diameter of the magnetic core is smaller, so the outer diameter of the sensor can also be smaller, making it possible to make it smaller and lighter.

この小型軽量化により、測定時における可動体である被
測定体あるいは磁気センサ用磁心の慣性力が小さくなる
ため支持枠の強度も小さくてよく、機械的応答性もよく
なる。Due to this reduction in size and weight, the inertial force of the movable object to be measured or the magnetic core for the magnetic sensor is reduced during measurement, so the strength of the support frame may be reduced, and mechanical responsiveness is improved.

また、非磁性マイクロチューブを外装とするためセンナ
用磁心として容易に加工、取付けができる。In addition, since the non-magnetic microtube is used as the exterior, it can be easily processed and installed as a magnetic core for senna.

〔実施例〕〔Example〕

以下１本発明を図面を参照してその実施例に基づいて説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments with reference to the drawings.

ｉｉ図（ａ）（ｂ）（’ｃ）（ｄ）（１）断面図にｔｔ
本発明の実施例が示される。ii Figures (a) (b) ('c) (d) (1) tt in cross section
An embodiment of the invention is shown.

まず、ケーブルｌを複数本のアモルファス磁性合金ワイ
ヤを撚り合わせて形成する。First, the cable l is formed by twisting together a plurality of amorphous magnetic alloy wires.

次に、第３図に示されるようにケーブルドラム２に巻回
されたケーブル１をピンチロール３および引取ロール６
により軸線方向の力を加え、伸展移送する。Next, as shown in FIG. 3, the cable 1 wound around the cable drum 2 is transferred to the pinch roll 3 and the
applies an axial force and stretches and transports it.

ここで、接着剤塗布＠４により接着剤を塗布し、乾燥用
ランプ５で乾燥固着する。Here, an adhesive is applied using adhesive application@4 and dried and fixed using a drying lamp 5.

さらに、剛性を有し、棒状となったケーブル１を所定の
長さに切断機７で切断し、固着ケーブル８に形成する。Further, the rigid, rod-shaped cable 1 is cut into a predetermined length by a cutter 7 to form a fixed cable 8.

このため、切断が容易であり、切断長の精度も良い。Therefore, cutting is easy and the precision of the cutting length is also good.

さらに、第２図に示されるように複数本の固着ケーブル
８を非磁性マイクロチューブ９に挿入し、接着剤で固着
し１本実施例である磁気センサ用磁心ｌ】が形成される
。Furthermore, as shown in FIG. 2, a plurality of fixed cables 8 are inserted into the nonmagnetic microtube 9 and fixed with an adhesive to form a magnetic core for a magnetic sensor according to this embodiment.

この非磁性マイクロチューブ９の両端にネジ部１０を切
り、他の部材への連結を行う。Threaded portions 10 are cut at both ends of this nonmagnetic microtube 9 to connect it to other members.

この非磁性マイクロチューブ９はステンレス３１６０黄
銅など周囲のものと熱膨張係数が同じものを選択するの
が好適で、金属なので内外面に容易にネジが切れ、衝撃
に強い。This non-magnetic microtube 9 is preferably made of stainless steel 3160 brass or other material that has the same coefficient of thermal expansion as the surrounding material.Since it is metal, it can be easily threaded on the inner and outer surfaces and is resistant to impact.

構成材との８膨張係数をほぼ等しくすることで０点ドリ
フトを小さくできるなど他より優れた面が多い。It has many advantages over others, such as the ability to reduce zero point drift by making the coefficient of expansion nearly equal to that of the constituent materials.

第１図（ａ）（ｂ）（ｃ）（ｄ）に示されるように、使
用目的に応じて、固着ケーブル８の本数を増減して東ね
るか、さらにワイヤ数の多いケーブルＩを作り、これを
使用してもよい。As shown in FIGS. 1(a), (b), (c), and (d), depending on the purpose of use, you can increase or decrease the number of fixed cables 8, or create a cable I with an even larger number of wires. You may use this.

〔発明の効果〕 本発明は以北説明したように、アモルファス磁性合金か
ら成るためその特性は高感度、高透磁性および高周波に
対する高応答性であり、また、温度変化に対する特性変
化が小さく温度補償を不要とする。[Effects of the Invention] As explained above, since the present invention is made of an amorphous magnetic alloy, its characteristics are high sensitivity, high magnetic permeability, and high response to high frequencies.In addition, the characteristics change with respect to temperature changes are small and temperature compensation is possible. is no longer necessary.

さらに、高透磁性であるためインダクタンスが大きくコ
イル巻数が少なくコイル外径が小さく。Furthermore, because it has high magnetic permeability, it has a large inductance, a small number of coil turns, and a small coil outer diameter.

さらに、細いアモルファス磁性合金から成るため磁心外
径も小さくなるためセンサ外径も小さくでき、局所的測
定も容易となり小型軽量化する。Furthermore, since it is made of a thin amorphous magnetic alloy, the outer diameter of the magnetic core is smaller, so the outer diameter of the sensor can also be made smaller, making local measurements easier and making it smaller and lighter.

被測定体径は磁心外径に関係するため受感部に対して測
定範囲が広く、使用条件の制約が少なくなる。Since the diameter of the object to be measured is related to the outer diameter of the magnetic core, the measurement range is wide with respect to the sensing part, and there are fewer restrictions on usage conditions.

この小型軽量化により、測定時における可動体である被
測定体あるいは磁気センナ用磁心の慣性力が小さくなる
ため支持枠の強度も小さくてよく１機械的応答性もよく
なる。Due to this reduction in size and weight, the inertial force of the movable object to be measured or the magnetic core for the magnetic sensor is reduced during measurement, so the strength of the support frame can be reduced and the mechanical response is also improved.

また、非磁性マイクロチューブを外装とするためセンサ
用磁心として容易に加工、地付けができるという効果を
奏する。Furthermore, since the non-magnetic microtube is used as the exterior, it can be easily processed and installed as a magnetic core for a sensor.

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

第１図は（ａ）（ｂ）（ｃ）（ｄ）は本発明の実施例の
横断面図、第２図は第１図の実施例の部分断面図、第３
図は第１図の製造工程説明図である。 １・・・ケーブル ８・・・固着ケーブル ９・・・非磁性マイクロチューブ １１・・・磁気センサ用磁心1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is a partial sectional view of the embodiment of FIG. 1, and FIG.
The figure is an explanatory diagram of the manufacturing process of FIG. 1. 1... Cable 8... Fixed cable 9... Non-magnetic micro tube 11... Magnetic core for magnetic sensor

Claims (1)

【特許請求の範囲】[Claims] １　複数本のアモルファス磁性合金ワイヤを撚り合わせ
てケーブルとし、該ケーブルを接着剤で固着し、該固着
ケーブルを非磁性マイクロチューブに複数本挿入し、接
着剤で固着したことを特徴とする磁気センサ用磁心。1. A magnetic sensor characterized in that a plurality of amorphous magnetic alloy wires are twisted together to form a cable, the cables are fixed with an adhesive, a plurality of the fixed cables are inserted into a non-magnetic microtube, and the cables are fixed with an adhesive. Magnetic core.