JPH01308970A - Photocurrent sensor - Google Patents
Photocurrent sensorInfo
- Publication number
- JPH01308970A JPH01308970A JP63140041A JP14004188A JPH01308970A JP H01308970 A JPH01308970 A JP H01308970A JP 63140041 A JP63140041 A JP 63140041A JP 14004188 A JP14004188 A JP 14004188A JP H01308970 A JPH01308970 A JP H01308970A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- magnetic
- magnetic core
- gap
- magnetic field
- 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
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Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は主として、ケーブル等を流れる導体電流を計測
するのに使用される光電流センサに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention primarily relates to a photocurrent sensor used to measure conductor current flowing through a cable or the like.
（従来技術）
従来、光学式の電流計測方法としては、ファラデー効果
を応用した光磁界センサを、ケーブル等の電流路の周囲
に配置し、その電流路を流れる導体電流に応じて発生す
る磁界の量から電流値を検出する方法があった。(Prior art) Conventionally, as an optical current measurement method, an optical magnetic field sensor that applies the Faraday effect is placed around a current path such as a cable, and the magnetic field sensor that is generated in response to the conductor current flowing through the current path is measured. There was a method to detect the current value from the amount.
この電流計測に使用される光磁界センサは例えば第１１
図に示すような構成になっている。これは、発光素子Ａ
からの光波が光ファイバＢによって光コネクタＣに導か
れ、平行ビームとなって口ラドレンズＤを通して偏光子
Ｅに入射し、偏光子Ｅからの出力光は直線偏光波となっ
てファラデー素子Ｆに入射する。ファラデー素子Ｆには
ケーブル等の電流路０を流れる被測定電流Ｉにより発生
した磁界Ｈが光波伝搬方向に加わり、偏光面は磁界強度
に比例して回転する（この現象をファラデー効果という
）。The optical magnetic field sensor used for this current measurement is, for example, the 11th
The configuration is as shown in the figure. This is light emitting element A
The light wave from is guided to the optical connector C by the optical fiber B, becomes a parallel beam and enters the polarizer E through the front lens D, and the output light from the polarizer E becomes a linearly polarized light wave and enters the Faraday element F. do. A magnetic field H generated by a current to be measured I flowing through a current path 0 such as a cable is applied to the Faraday element F in the light wave propagation direction, and the plane of polarization rotates in proportion to the magnetic field strength (this phenomenon is called the Faraday effect).
第１１図の旋光子Ｇは、検光子Ｊと偏光子Ｅとの間に相
対的に４５度の偏光面角度を与えるものであり、検光子
Ｊからの出力光の強度はファラデー効果による偏光面の
回転により、被測定電流Ｉによって発生した磁界Ｈによ
り変化する。この出力光はロッドレンズＫに入射し、更
に光コネクタＬを通して光ファイバＭに入射し、同ファ
イバＭによって受光素子Ｎへ導かれ、同素子Ｎにより光
／電気変換される。この変換量を検出すれば磁界強度、
即ち、被測定電流路Ｐを流れる被測定電流Ｉを測定する
ことができる。The optical rotator G in Fig. 11 provides a relative plane of polarization angle of 45 degrees between the analyzer J and the polarizer E, and the intensity of the output light from the analyzer J is determined by the polarization plane due to the Faraday effect. As the current I rotates, the magnetic field H generated by the current I to be measured changes. This output light is incident on a rod lens K, further incident on an optical fiber M through an optical connector L, guided by the fiber M to a light receiving element N, and optically/electrically converted by the element N. Detecting this conversion amount determines the magnetic field strength.
That is, the current to be measured I flowing through the current path to be measured P can be measured.
尚、上記ファラデー素子Ｆにはビスマスゲルマニウムオ
キサイド単結晶や希土類ガーネット単結晶等の光学結晶
が用いられている。Incidentally, for the Faraday element F, an optical crystal such as a bismuth germanium oxide single crystal or a rare earth garnet single crystal is used.
又低電流を高精度に計測する場合は第１２図及び第１３
図に示すように、けい素鋼等の磁性コアＰのギヤツブＱ
中に、第１１図の光磁界センサＲを組込んで電流を計測
する。この場合、被測定電流路に対してギヤツブＱ中に
発生する磁界ＨｇはＨｇ”Ｉ／ （（１２＋ １１ ／
ル））終 ；磁性体（コア）の透磁率
ＩＩ 、ギャップ長
１２；鉄心中の平均磁路長
と表わされるので、光磁界センサＲによりギヤツブＱ中
の磁界Ｈｇを検出することにより、電流路０を流れる被
測定電流Ｉを計測することが可能となる。In addition, when measuring low current with high precision, see Figures 12 and 13.
As shown in the figure, a gear Q of a magnetic core P made of silicon steel, etc.
The optical magnetic field sensor R shown in FIG. 11 is incorporated inside to measure the current. In this case, the magnetic field Hg generated in the gear Q with respect to the current path to be measured is Hg''I/((12+11/
(Le)) End; Magnetic permeability II of the magnetic body (core); Gap length 12; Average magnetic path length in the iron core. It becomes possible to measure the current to be measured I flowing through 0.
なお、磁性コアＰのギヤツブＱ中の磁界Ｈｇは、電流路
０の周辺に単に発生する磁界Ｈに比べて数倍〜１０数倍
大きいので、低電流を高精度に計測することができる。Note that the magnetic field Hg in the gear Q of the magnetic core P is several to ten times larger than the magnetic field H simply generated around the current path 0, so that low current can be measured with high precision.
更に定電流路Ｏ以外の線路電流により発生する磁界の影
響を排除することができる。Furthermore, the influence of magnetic fields generated by line currents other than the constant current path O can be eliminated.
（発明が解決しようとする課１１）
しかしながら前記した従来の光学式の電流計測方法は次
のような問題があった。(Issue 11 to be Solved by the Invention) However, the conventional optical current measurement method described above has the following problems.
■、第１４図（ギャップ９部分の側面図）、第１５図（
ギャップ９部分の正面図）のように、ギャップＱの中心
付近は漏れ磁界が少なく、周辺になる程大きくなるため
、中心と周辺とで発生磁界強度が異なる（ギャップ長に
もよるが周辺磁界は中心磁界のｌＯ〜２０ダウンする）
、このため光磁界センサＲの感度のバラツキ（出力誤差
）を無くするためには、第１１図の光磁界センサＲにお
けるファラデー素子Ｆが、精度良くギャップＱの中心に
位置するように、光磁界センサＲをギヤツブＱ内に配置
しなければならなず１面倒であった■、光電流センサは
既設の電流路０の外周に配置できるようにするため、通
常は磁性コアＰを第１３図のようにＰａ、Ｐｂ、Ｐｃの
三つに分割されている。このためギヤツブＱ中の最適位
置に精度良く光磁界センサＲを配置し、しかも磁性コア
Ｐａ、Ｐｂ、Ｐｃ＋７）端面Ｓ＋ 、Ｓ２ 、Ｓ３．３
４が位置ズレしないように結合する必要があり面倒であ
った。■, Figure 14 (side view of gap 9), Figure 15 (
As shown in the front view of the gap 9 section), the leakage magnetic field is small near the center of the gap Q, and increases toward the periphery, so the generated magnetic field strength differs between the center and the periphery (although it depends on the gap length, the surrounding magnetic field is center magnetic field lO~20 down)
, Therefore, in order to eliminate variations in sensitivity (output error) of the magneto-optical field sensor R, it is necessary to adjust the magneto-optical field so that the Faraday element F in the magneto-optical field sensor R shown in FIG. The sensor R had to be placed inside the gear Q, which was troublesome. However, in order to be able to place the photocurrent sensor on the outer periphery of the existing current path 0, the magnetic core P is usually placed as shown in Figure 13. It is divided into three parts: Pa, Pb, and Pc. For this reason, the optical magnetic field sensor R is placed at an optimal position in the gear Q with high precision, and the magnetic core Pa, Pb, Pc+7) end faces S+, S2, S3.3
It was troublesome because it was necessary to connect the parts 4 so that they would not be misaligned.
（発明の目的）
本発明は前記の各種問題点を解決し、光磁界センサＲを
ギャップＱの所定位置に正確に取付けることができ、ま
た、磁性コアの端面ｓ、、ｓ２、Ｓ３ 、Ｓｓ間の位置
ズレも防止できる光電流センサを実現することにある。(Objective of the Invention) The present invention solves the various problems mentioned above, allows the optical magnetic field sensor R to be accurately mounted at a predetermined position in the gap Q, and also enables The object of the present invention is to realize a photocurrent sensor that can also prevent positional deviation.
（問題点を解決するための手段）
前記問題点を解決するための本発明を第１図〜第９図の
実施例に基づいて説明する。(Means for Solving the Problems) The present invention for solving the above problems will be explained based on the embodiments shown in FIGS. 1 to 9.
本発明のうち請求項第１の光電流センサは、第１図に示
される一部の磁性コア１を第４図の固定金具２に固定し
、第１図に示される他の二つの磁性コア３．４をギヤー
２プ５を設けて第３図の他の固定金具６に固定すると共
に同ギャップ５内に光磁界センサ７を配置固定し、夫々
の固定金具２．６の外周を第５図のように、夫々の接合
面８．９を残して樹脂１０でモールドしてセンサ本体１
１、１２とし、この二つのセンサ本体１１．１２の接合
面８，９を重合して位置合せビン１３により結合するこ
とにより１両センサ本体１１．１２の磁性コアｌの一方
の端面１ａと磁性コア３の端面３ａ、磁性コアｌの他方
の端面１ｂと磁性コア４の端面４ａとが位置合せされる
ようにしたものである。A photocurrent sensor according to claim 1 of the present invention has a part of the magnetic core 1 shown in FIG. 1 fixed to the fixing fitting 2 shown in FIG. 4, and the other two magnetic cores shown in FIG. 3.4 is provided with a gear 2 peg 5 and fixed to another fixing metal fitting 6 shown in FIG. As shown in the figure, the sensor body 1 is molded with resin 10 leaving the joint surfaces 8 and 9.
1 and 12, and by overlapping the bonding surfaces 8 and 9 of these two sensor bodies 11.12 and joining them with the alignment pin 13, one end surface 1a of the magnetic core l of the two sensor bodies 11.12 and the magnetic The end surface 3a of the core 3, the other end surface 1b of the magnetic core 1, and the end surface 4a of the magnetic core 4 are aligned.
本発明のうち請求項第２の光電流センサは請求項第１の
光電流センサにおいて、光磁界センサ７におけるファラ
デー素子１４（第８図）が前記ギャップ５の中心に位置
するように配置されてなるものである。A photocurrent sensor according to a second aspect of the present invention is the photocurrent sensor according to the first aspect, wherein the Faraday element 14 (FIG. 8) in the optical magnetic field sensor 7 is arranged so as to be located at the center of the gap 5. It is what it is.
未発明のうち請求項第３の光電流センサは請求項第１又
は第２の光電流センサにおいて、結合されるセンサ本体
１１．１２の接合面８，９間にパッキング１５を配置し
て、同接合面８，９間を防水、防塵構造としたものであ
る。Among the uninvented claims, the photocurrent sensor of claim 3 is the photocurrent sensor of claim 1 or 2, in which a packing 15 is disposed between the bonding surfaces 8 and 9 of the sensor bodies 11 and 12 to be combined, and the photocurrent sensor is the same. The space between the joint surfaces 8 and 9 has a waterproof and dustproof structure.
（実施例）
第１図は本発明の分′Ｍ型光電流センサの原理図であり
、これは三つの磁性コア１，３．４のうち二つの磁性コ
ア３と４の間にギャップ５を設け、このギャップ５内に
光磁界センサ７を配置しである。(Example) Fig. 1 is a diagram showing the principle of the minute M type photocurrent sensor of the present invention, which has a gap 5 between two magnetic cores 3 and 4 among three magnetic cores 1 and 3.4. A magneto-optical field sensor 7 is disposed within this gap 5.
第２図は本発明の光電流センサの一実施例である。これ
は二つのセンサ本体１１．１２を、ケーブル等の電流路
０の外側に配置して、固定ネジ１７により固定してなる
ものである。FIG. 2 shows an embodiment of the photocurrent sensor of the present invention. This consists of two sensor bodies 11 and 12 arranged outside a current path 0 such as a cable and fixed with fixing screws 17.
、二つのセンサ本体１１．１２のうち一方のセンサ本体
１１は、第７図ｃ、ｄの固定金具２の二枚の側壁板１８
ａ、１８ｂ間に同図ａに示される半円状の磁性コアｌを
同図すのように嵌入し、同磁性コアｌの両端部１９ａ、
１９ｂを固定金具２の基板２０に形成されている通孔２
１に差し込んで、同図すのように磁性コア１の両端面１
ａ、１ｂを基板２０の底面２０ａと同一面にしである。, one of the two sensor bodies 11 and 12 is attached to the two side wall plates 18 of the fixing fitting 2 shown in FIGS. 7c and 7d.
A semicircular magnetic core l shown in figure a is inserted between a and 18b as shown in the figure, and both ends 19a of the magnetic core l are
19b is the through hole 2 formed in the substrate 20 of the fixture 2.
1 and both end surfaces 1 of the magnetic core 1 as shown in the same figure.
a and 1b are flush with the bottom surface 20a of the substrate 20.
そして、この第７図すの状態で固定金具２及び磁性コア
ｌの外周を第５図のようにウレタン、シリコーン等の樹
脂１０でモールドしである。この場合、接合面８（基板
２０の底面２０ａ及び磁性コアｌの端面１ａ、ｌｂ）は
樹脂ｌＯでモールドせずに外部に露出させである。Then, in the state shown in FIG. 7, the outer periphery of the fixture 2 and the magnetic core I is molded with a resin 10 such as urethane or silicone as shown in FIG. In this case, the bonding surfaces 8 (the bottom surface 20a of the substrate 20 and the end surfaces 1a, lb of the magnetic core 1) are not molded with resin 1O and are exposed to the outside.
第２図における他方のセンサ本体１２は、第６図ｃ、ｄ
の固定金具６の二枚の側壁板２１ａ、２１ｂ間に第６図
ａに示されるｌ／４円形の磁性コア３．４を同図すのよ
うに適宜間隔離して（ギャップ５を設けて）ｔｅ入し、
各磁性コア３．４の両端部２２ａ、２２ｂを固定金具６
の基板２３に形成されている通孔２４に差し込んで、同
図すのように磁性コア３．４の端面３ａ、４ａを基板２
３の底面２３ａと同一面にしである。The other sensor main body 12 in FIG. 2 is shown in FIGS.
The 1/4 circular magnetic core 3.4 shown in FIG. 6a is separated between the two side wall plates 21a and 21b of the fixing fitting 6 by an appropriate distance (a gap 5 is provided) as shown in the same figure. Enter te,
Fixing metal fittings 6
The magnetic core 3.4 is inserted into the through hole 24 formed in the substrate 23, and the end surfaces 3a, 4a of the magnetic core 3.4 are inserted into the substrate 23 as shown in the figure.
It is on the same surface as the bottom surface 23a of No. 3.
また、第６Ｖ！Ｊｂ、ｃノ側壁板２１ａ、２１ｂの切欠
き部２５（磁性コア３．４の間のギャップとなる箇所）
に第３図、第４図のように光磁界センサ７を装着しであ
る。Also, the 6th V! Notches 25 of Jb and C side wall plates 21a and 21b (locations that serve as gaps between magnetic cores 3.4)
As shown in FIGS. 3 and 4, an optical magnetic field sensor 7 is attached to the sensor.
そして、第３図、第４図の状態で固定金具６及び磁性コ
ア３．４の外周を第５図、第８図、第９図のようにウレ
タン、シリコーン等の樹脂１０でモールドしである。こ
の場合、接合面９（基板２３の底面２３ａ及び磁性コア
３，４の端面３ａ。Then, in the state shown in FIGS. 3 and 4, the outer periphery of the fixing fitting 6 and the magnetic core 3.4 is molded with a resin 10 such as urethane or silicone as shown in FIGS. 5, 8, and 9. . In this case, the bonding surface 9 (the bottom surface 23a of the substrate 23 and the end surfaces 3a of the magnetic cores 3 and 4).
４ａ）は樹脂１０でモールドせずに外部に露出させであ
る。4a) is not molded with resin 10 and is exposed to the outside.
また、第４図のようにセンサ本体１２の固定金具６の基
板２３の底面２３ａには、磁性コア３．４の端面３ａ、
４ａを囲むようにリング状の収納溝２５が形成され、そ
の収納溝２５内に第５図。Further, as shown in FIG. 4, on the bottom surface 23a of the substrate 23 of the fixing fitting 6 of the sensor main body 12, the end surface 3a of the magnetic core 3.4,
A ring-shaped storage groove 25 is formed to surround 4a, and inside the storage groove 25, as shown in FIG.
第９図のように０リング等のパー、キング１５を嵌入し
て、両センサ本体１１．１２の接合面８と９を接合した
ときに、再接合面８．９間へ塵芥や水などが侵入しない
ようにしである。As shown in Fig. 9, when a parer or king 15 such as an O-ring is inserted and the joint surfaces 8 and 9 of both sensor bodies 11.12 are joined, dust, water, etc. may enter between the re-joining surfaces 8.9. This is to prevent intrusion.
又センサ本体１２の固定金具６の基板２３には第４図、
第５図のように位置合せピン１３が突設され、他方のセ
ンサ本体１１の固定金具２の基板２０には第３図、第５
図のように差し込み孔２８が開設されている。この差し
込み孔２８に前記の位置合せピン１３を差し込むと、セ
ンサ本体１１に内蔵されている磁性コア１の端面１ａ、
１ｂと、センサ本体１２に内蔵されている磁性２コア３
．４の端面３ａ、４ａが高精度に位置合せされるように
しである。In addition, the substrate 23 of the fixing metal fitting 6 of the sensor body 12 has the markings shown in FIG.
A positioning pin 13 is provided protrudingly as shown in FIG.
An insertion hole 28 is provided as shown in the figure. When the alignment pin 13 is inserted into the insertion hole 28, the end face 1a of the magnetic core 1 built in the sensor body 11,
1b, and two magnetic cores 3 built into the sensor body 12.
．． The end surfaces 3a and 4a of the cylindrical member 4 are aligned with high precision.
ちなみに、位置合せビン１３を使用せずに、単に磁性コ
アｌ、３．４と光磁界センサ７とを樹脂１０でモールド
しただけでは、磁界コア３．４間のギャップ５の中心に
光磁界センサ７を正確に配置することは困難であり、同
センサ７の感度低下やバラツキを招くことになる。この
ようになると磁性コア１と３の間、磁性コアｌと４の間
の磁路に悪影響が出て、ギャップ５中に発生する磁界量
の低下につながる。By the way, if the magnetic cores 1, 3.4 and the optical magnetic field sensor 7 are simply molded with the resin 10 without using the alignment bin 13, the optical magnetic field sensor will be placed in the center of the gap 5 between the magnetic cores 3.4. It is difficult to accurately arrange the sensor 7, which leads to a decrease in sensitivity and variations in the sensor 7. If this happens, the magnetic paths between the magnetic cores 1 and 3 and between the magnetic cores 1 and 4 will be adversely affected, leading to a decrease in the amount of magnetic field generated in the gap 5.
また、センサ本体１１と１２の接合面７．８を単に重合
して固定しただけでは、接合面７．８間に塵芥や水が侵
入して、磁性コア１．３，４が錆たり腐食したりする。Furthermore, if the bonding surfaces 7.8 of the sensor bodies 11 and 12 are simply overlapped and fixed, dust and water may enter between the bonding surfaces 7.8 and the magnetic cores 1.3, 4 may rust or corrode. or
この場合も、磁性コアｌと３の間、磁性コア１と４の間
の磁路に悪影響が出て、ギャップ５中に発生する磁界量
の低下につながる。In this case as well, the magnetic paths between the magnetic cores 1 and 3 and between the magnetic cores 1 and 4 are adversely affected, leading to a decrease in the amount of magnetic field generated in the gap 5.
第３図〜第５図の光磁界センサ７は、第８図のようにセ
ンサケース３０に内蔵されおり、同センサ７内にはファ
ラデー素子１４が内蔵されており、しかも、このファラ
デー素子１４は磁界コア３と４の間のギャップ５内にお
いて、内磁界コア３と４の中心と一致するように正確に
固定されている。The optical magnetic field sensor 7 shown in FIGS. 3 to 5 is built in a sensor case 30 as shown in FIG. 8, and a Faraday element 14 is built in the sensor 7. It is precisely fixed within the gap 5 between the magnetic field cores 3 and 4 so as to coincide with the centers of the inner magnetic field cores 3 and 4.
なお、第８図、第９図において、３１は光コネクタ、３
２は光ファイバ、３３は光フアイバケーブル、３４はキ
ャップ、第３図〜第５図の３５はセンサ取付はプレート
である。In addition, in FIGS. 8 and 9, 31 is an optical connector, 3
2 is an optical fiber, 33 is an optical fiber cable, 34 is a cap, and 35 in FIGS. 3 to 5 is a sensor mounting plate.
第１Ｏ図は上記実施例を用いてケーブルの導体電流を測
定した結果である。同図において横軸は導体電流、縦軸
はセンサ出力を示す、これより。FIG. 1O shows the results of measuring the conductor current of the cable using the above embodiment. In the figure, the horizontal axis shows the conductor current, and the vertical axis shows the sensor output.
導体電流Ｏ〜５００Ａの広いダイナミックレンジにおい
て、非常に良好な直線性が得られていることが明らかで
ある。It is clear that very good linearity is obtained over a wide dynamic range of conductor currents from 0 to 500 A.
（発明の効果） 本発明の光電流センサは次のような各種効果がある。(Effect of the invention) The photocurrent sensor of the present invention has the following various effects.
■。二つのセンサ本体１１．１２を位置決めピン１３で
連結するので、磁性コアｌ、３．４を高精度に位置合せ
することができ、光磁界センサ７を磁気コア３，４間の
ギャップ５の中心に正確に配置することができる。この
ため光磁界センサ７の感度低下やバラツキなどが発生し
にくくなり、ギャップ５中に発生する磁界量が低下しな
い。■. Since the two sensor bodies 11.12 are connected by the positioning pin 13, the magnetic cores 1 and 3.4 can be aligned with high precision, and the optical magnetic field sensor 7 can be positioned at the center of the gap 5 between the magnetic cores 3 and 4. can be placed accurately. Therefore, a decrease in sensitivity and variations in the sensitivity of the optical magnetic field sensor 7 are less likely to occur, and the amount of magnetic field generated in the gap 5 does not decrease.
■、磁性コアｌ、３．４を固定金具２．６に固定しであ
るので、ギャップ５中に光磁界センサ７が正確に配置さ
れ、高精度の電流検出が可能となる。(2) Since the magnetic core 1, 3.4 is fixed to the fixture 2.6, the optical magnetic field sensor 7 is accurately placed in the gap 5, allowing highly accurate current detection.
■、二つのセンサ本体１１．１２を分離できるようにし
であるので、既設のケーブル等の電流路０を切り離すこ
となく、同電流路０の外側に簡易に取付けて（導体）電
流を精度良く検出することができる。■Since the two sensor bodies 11 and 12 can be separated, they can be easily installed outside the current path 0 of existing cables, etc. to accurately detect the current (conductor). can do.
■、磁性コア３．４の夫々の端面３ａ、４ａの外周にパ
ツキン１５を設けであるので、接合面８．９間が防塵、
防水構造になり、磁性コア１．３．４の錆や腐食を防止
でさ、バラツキのない電流測定が可能となる。(2) A gasket 15 is provided on the outer periphery of each end surface 3a, 4a of the magnetic core 3.4, so that the area between the joint surfaces 8.9 is dust-proof.
The waterproof structure prevents rust and corrosion of the magnetic core 1.3.4, making it possible to measure current without variation.
■、接合面８．９を除いた部分を樹脂ｌＯでモールドし
であるので、防水性はもちろん、耐候性も向上する。(2) Since the parts other than the joint surface 8.9 are molded with resin lO, not only waterproof properties but also weather resistance are improved.
第１図は本発明の光電流センサの一例を示す原理図、第
２図は同センサの一例を示す外観図、第３図及び第４図
は同センサのモールドする前の説明図、第５図はモール
ドしたセンサ本体の説明図、第６図及び第７図のａ−ｄ
は磁気コアを固定金具に取付ける過程の説明図、第８図
は一方のセンサ本体の平面説明図、第９図は同センサ本
体の側面図、第１０図は本発明の光電流センサにより測
定された導体電流の説明図、第１１図は光磁界センサの
一例を示す説明図、第１２図は従来の光電流センサの原
理説明図、第１３図は従来の他の光電流センサの原理説
明図、第１４図は第１３図のギャップにおける磁界の側
面説明図、第１５図は同磁界の正面説明図である。
１．３．４は磁性コア
ｌａ、ｌｂ、３ａ、４ａは磁性コアの端面２．６は固定
金具
５はギャップ
７は光磁界センサ
８．９は接合面
ｉｏは樹脂
１１．１２はセンサ本体
１３は位置合せビン
１４はファラデー素子
１５はパッキングFIG. 1 is a principle diagram showing an example of the photocurrent sensor of the present invention, FIG. 2 is an external view showing an example of the same sensor, FIGS. 3 and 4 are explanatory diagrams of the same sensor before molding, and FIG. The figures are explanatory diagrams of the molded sensor body, a-d in Figures 6 and 7.
8 is an explanatory diagram of the process of attaching the magnetic core to the fixture, FIG. 8 is an explanatory plan view of one sensor body, FIG. 9 is a side view of the sensor body, and FIG. 11 is an explanatory diagram showing an example of a photomagnetic field sensor, FIG. 12 is an explanatory diagram of the principle of a conventional photocurrent sensor, and FIG. 13 is an explanatory diagram of the principle of another conventional photocurrent sensor. , FIG. 14 is a side explanatory view of the magnetic field in the gap of FIG. 13, and FIG. 15 is a front explanatory view of the same magnetic field. 1.3.4 is the magnetic core la, lb, 3a, 4a is the end face of the magnetic core 2.6 is the fixing fitting 5 is the gap 7 is the optical magnetic field sensor 8.9 is the joint surface io is the resin 11.12 is the sensor body 13 The alignment bin 14 is the Faraday element 15, and the packing
Claims (3)
つの磁性コア３、４をギャップ５を設けて固定金具６に
固定すると共に同ギャップ５内に光磁界センサ７を配置
固定し、夫々の固定金具２、６の外周を夫々の接合面８
、９を残して樹脂１０でモールドしてセンサ本体１１、
１２とし、この二つのセンサ本体１１、１２の接合面８
、９同士を重合して位置合せピン１３により結合するこ
とにより、両センサ本体１１、１２の磁性コア１の一方
の端面１ａと磁性コア３の端面３ａ、磁性コア１の他方
の端面１ｂと磁性コア４の端面４ａとが位置合わせされ
るようにしたことを特徴とする光電流センサ。(1) A part of the magnetic core 1 is fixed to the fixture 2, and the other two magnetic cores 3 and 4 are fixed to the fixture 6 with a gap 5 provided, and the optical magnetic field sensor 7 is arranged within the gap 5. fix the outer peripheries of the respective fixing fittings 2 and 6 to the respective joint surfaces 8.
, leaving 9 and molding with resin 10 to form a sensor body 11,
12, and the joint surface 8 of these two sensor bodies 11 and 12
, 9 are overlapped and connected by the alignment pin 13, one end surface 1a of the magnetic core 1 of both sensor bodies 11, 12, the end surface 3a of the magnetic core 3, and the other end surface 1b of the magnetic core 1 are magnetically connected. A photocurrent sensor characterized in that an end surface 4a of a core 4 is aligned.
ァラデー素子１４が前記ギャップ５の中心に位置するよ
うに配置されたことを特徴とする光電流センサ。(2) The photocurrent sensor according to claim 1, wherein the Faraday element 14 in the photomagnetic field sensor 7 is arranged so as to be located at the center of the gap 5.
本体１１、１２の接合面８、９間にパッキング１５を配
置して、接合面８、９間を防水、防塵構造としたことを
特徴とする光電流センサ。(3) In claim 1 or 2, the packing 15 is arranged between the joint surfaces 8 and 9 of the sensor bodies 11 and 12 to be combined, so that the joint surfaces 8 and 9 have a waterproof and dustproof structure. Features of photocurrent sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63140041A JPH01308970A (en) | 1988-06-07 | 1988-06-07 | Photocurrent sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63140041A JPH01308970A (en) | 1988-06-07 | 1988-06-07 | Photocurrent sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01308970A true JPH01308970A (en) | 1989-12-13 |
Family
ID=15259596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63140041A Pending JPH01308970A (en) | 1988-06-07 | 1988-06-07 | Photocurrent sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01308970A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5732167A (en) * | 1995-04-04 | 1998-03-24 | Matsushita Electric Industrial Co., Ltd. | Optical fiber sensor for measuring a magnetic field or electric current and method for making the same |
-
1988
- 1988-06-07 JP JP63140041A patent/JPH01308970A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5732167A (en) * | 1995-04-04 | 1998-03-24 | Matsushita Electric Industrial Co., Ltd. | Optical fiber sensor for measuring a magnetic field or electric current and method for making the same |
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