JP4220727B2 - Air core coil - Google Patents

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JP4220727B2
JP4220727B2 JP2002168572A JP2002168572A JP4220727B2 JP 4220727 B2 JP4220727 B2 JP 4220727B2 JP 2002168572 A JP2002168572 A JP 2002168572A JP 2002168572 A JP2002168572 A JP 2002168572A JP 4220727 B2 JP4220727 B2 JP 4220727B2
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thin wire
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JP2004014925A (en
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章 岡田
井上　　悟
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Description

【０００１】
【発明の属する技術分野】
この発明は、例えば電流センサ等に用いられる空芯コイルに関するもので、特に絶縁性の基板を用いて形成された空芯コイルに関するものである。
【０００２】
【従来の技術】
一般に、空芯コイルは、導体中を流れる電流を測定する電流センサに用いられることが多い。この空芯コイルは、導線が非磁性体の巻芯に巻回されて形成されたものである。この電流センサにおいては、空芯コイルが導体を囲って配置される。導体中を電流が流れると導体周りに磁束を発生するが、この磁束が空芯コイルの導線と錯交することにより、空芯コイルの導線にこの磁束変化に比例した誘導電流が流れる。電流センサは、この誘導電流を測定することにより導体中の電流を導出するのである。空芯コイルは磁性体の鉄芯等を有していないので、鉄心等による磁気飽和が無く、電流センサに用いられると幅広い電流範囲の測定が可能となる。
【０００３】
図１３は、従来の空芯コイルの構成を示す模式的な斜視図である。図１３において、空芯コイル１００は、樹脂等の非磁性体である基板１０１と、この基板１０１に設けられたコイル線１０２とを備えている。基板１０１は、導体が貫通する円形の基板開口部１０３を有している。コイル線１０２は、基板開口部１０３の周囲においてこの周方向に沿って金属箔等である導電性細線１０４が巻回されて形成されている。コイル線１０２は、基板１０１の両面に基板開口部１０３から略放射状に複数設けられた細線部１０４ａと、この両面の細線部１０４ａのそれぞれの端部同士を基板１０１を貫通して接続する複数の接続細線部１０４ｂとを有している。接続細線部１０４ｂは、基板１０１を厚さ方向に貫通する貫通孔に金属メッキされることにより形成されている。コイル線１０２は、基板１０１の両面に設けられた複数の細線部１０４ａが基板１０１を貫通する接続細線部１０４ｂにより電気的に直列に接続されて構成されたものである。従って、コイル線１０２は、基板１０１の両面で細線部１０４ａが露出した状態で基板１０１に埋め込まれている。
【０００４】
この空芯コイル１００は、導体を流れる電流による磁界だけでなく、外部からの磁界によっても誘導電流を発生する。この外部磁界による誘導電流は、導体の電流を測定する上で障害となるもので、電流センサの測定誤差の原因となる。この外部磁界による誘導電流の発生を抑制するための方法として、コイル線１０２の巻き進み方向と逆方向に巻き戻したコイル線をコイル線１０２に接続してコイル線１０２に発生する誘導起電力と逆方向の誘導起電力を巻き戻したコイル線に発生させて誘導起電力同士を相殺させる方法がある。従って、空芯コイル１００は、外部磁界による誘導電流の発生を抑制するために、コイル線１０２及び基板１０１にそれぞれ鏡面対称である巻き戻しのコイル線及び基板１０１’を備えた空芯コイル１００’がこの空芯コイル１００に貼り付けられて電流センサに用いられている。即ち、コイル線１０２及び巻き戻しのコイル線が電気的に直列に接続されるとともに、図に示されるように、基板１０１’の基板開口部１０３’を基板開口部１０３に揃わせて基板１０１と基板１０１’とが互いに貼り合わされることにより、コイル線１０２の巻き進み方向と逆方向に巻き戻すコイル線が鏡面対称に配置されて外部磁界及び外部電界（以下、外部電磁界という）による誘導起電力を相殺するように電流センサが構成されている。ここで、基板１０１及び基板１０１’には、互いに貼り合わされる面にそれぞれ外部に露出した細線部１０４ａ’及び細線部１０４ａが設けられているので、短絡しないように基板１０１と基板１０１’との間に絶縁層が介在している。
【０００５】
空芯コイル１００は、このような構成となっており、コイル線１０２が基板１０１に設けられているので、コイル線１０２の巻き間隔、即ち互いに隣り合う細線部１０４ａの間隔を容易に一定とすることができる。従って、測定されるべき導体中を流れる電流による磁束がコイル線１０２に均等に誘導起電力を発生させることができ、電流センサの測定精度が高くなっている。
また、空芯コイル１００は、空芯コイル１００’と貼り合わされて用いられているので、外部電磁界による誘導起電力が相殺されて、電流センサの外部電磁界による測定誤差が抑制されている。
【０００６】
【発明が解決しようとする課題】
しかしながら、コイル線１０２が巻き戻しのコイル線に対して異なる位置にあると、コイル線１０２に発生する誘導起電力と巻き戻したコイル線に発生する誘導起電力との間に差が生じ、すべてが相殺されず外部電磁界による誘導起電力の一部が残ってしまう。従って、外部電磁界による測定誤差を小さくするためには、できるだけコイル線１０２と巻き戻しのコイル線との配置位置を近づける必要があるが、従来例では空芯コイル１００と空芯コイル１００’とを貼り合わせる方法をとっていることから、コイル線１０２と巻き戻しのコイル線との配置位置を近づけるにも限界があるという問題点があった。
【０００７】
また、空芯コイル１００と空芯コイル１００’とを貼り合わせる方法では、コイル線１０２及び巻き戻しのコイル線の短絡を防止するために空芯コイル１００及び空芯コイル１００’の間に樹脂等の絶縁層を介在させなければならない。従って、それだけ時間及び労力が必要とされ、空芯コイル１００及び空芯コイル１００’を貼り合わせて電流センサを大量に生産することが困難であるという問題点があった。
【０００８】
また、空芯コイル１００におけるコイル線１０２の巻き数が多くなるとそれだけ多くの部分で誘導起電力が発生するので、電流センサの測定感度も増加する。このことから、コイル線１０２は巻き間隔をできるだけ密にして巻き数が多くなるようにしている。しかしながら、コイル線１０２の巻き間隔を密にするにもコイル線１０２自体の太さがあるため限界があり、また、空芯コイル１００に空芯コイル１００’を貼り合わせて巻き数を多くすることもできるが、空芯コイル１００及び空芯コイル１００’を貼り合わせることによる上記の問題点が発生するため、空芯コイル１００の巻き数を多くして容易に電流センサの測定感度をさらに増加させることは困難であるという問題点があった。
【０００９】
そこでこの発明は、上記のような問題点を解決することを課題とするもので、容易に製作できるとともに巻き数が多く、また外部電磁界による誘導起電力の発生をさらに抑制することができる等の空芯コイルを得ることを目的とする。
【００１０】
【課題を解決するための手段】
この発明に係る空心コイルは、導体に流れる電流を測定するために用いられる空芯コイルであって、中央に基板開口部を有した絶縁性基板と、前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により各前記コイル部に発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ１段ずつ重ねられた重ね基板部とを有し、各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有しており、各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列され、前記巻回方向に沿って視たときに、一方の前記コイル部の前記第１細線部と前記第２細線部との間に、他方の前記コイル部の前記第１細線部あるいは前記第２細線部のいずれかが配置されている。
【００１１】
また、導体に流れる電流を測定するために用いられる空芯コイルであって、中央に基板開口部を有した絶縁性基板と、前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により各前記コイル部に発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ１段ずつ重ねられた重ね基板部とを有し、各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有しており、各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列され、前記巻回方向に沿って視たときに、一方の前記コイル部の前記内径側接続細線部と前記外径側接続細線部との間に、他方の前記コイル部の前記内径側接続細線部あるいは前記外径側接続細線部のいずれかが配置されている。
【００１２】
また、導体に流れる電流を測定するために用いられる空芯コイルであって、中央に基板開口部を有した絶縁性基板と、前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ同数段重ねられた重ね基板部とを有し、前記芯基板部は、前記一面を有する一面側芯基板分割部と、前記他面を有する他面側芯基板分割部とから構成されており、各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有し、前記内径側接続細線部及び前記外径側接続細線部は、それぞれ前記一面側芯基板分割部及び前記他面側芯基板部の間で一面側接続分割部及び他面側接続分割部に分割されており、前記一面側接続分割部及び前記他面側接続分割部は、互いに電気的に接続する導体ランドを前記一面側接続分割部と前記他面側接続分割部との間にそれぞれ有しており、各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列されている。
【００１６】
また、前記巻回方向に沿って視たときに、前記導体が前記コイル線を囲んで絶縁体を介して少なくとも１回巻回されている。
【００１７】
また、前記基板開口部の径方向に沿って複数に分割された分割部から構成された空芯コイルであって、各前記分割部は、前記組み合わせられる際にそれぞれの前記導線を互いに着脱可能に電気的及び機械的に接続する接続手段を有している。
【００１８】
【発明の実施の形態】
実施の形態１．
図１は、この発明の実施の形態１に係る空芯コイルの構成を示す部分斜視図である。図１において、空芯コイル１は、樹脂等の非磁性体で作製された絶縁性基板２と、この絶縁性基板２に設けられたコイル線３とを備えている。絶縁性基板２は、導体が貫通する基板開口部４を中央に有した円板である。この基板開口部４の形状は、貫通する導体の軸線周りに沿った円形状となっている。コイル線３は、この基板開口部４の外周に沿って導線が巻回されて構成された複数（例えば、２つ）のコイル部である巻き戻しコイル部５及び巻き進みコイル部６を有している。この巻き戻しコイル部５と巻き進みコイル部６とは接続点７で電気的に直列に接続されている。この巻き戻しコイル部５及び巻き進みコイル部６は、導体に流れる電流によってそれぞれのコイル部に発生した誘導起電力が電気的に同じ向きになるように巻回されている。
【００１９】
図２は、コイル線３の構成を示す部分拡大図であり、図３は、コイル線３の巻回方向に沿って視たときの巻き戻しコイル部５及び巻き進みコイル部６の配置状態を示す模式図である。図２においては、巻き戻しコイル部５と巻き進みコイル部６との接続点７付近のコイル線３を示している。また、図４は、絶縁性基板の厚さ方向に視たときの空芯コイル１の模式的な正面図である。図１乃至図４において、絶縁性基板２は、巻き戻しコイル部５及び巻き進みコイル部６の導線がともに貫通した芯基板部８と、この芯基板部８の一面９及び他面１０にそれぞれ１段ずつ重ねられた重ね基板部１１とを有している。重ね基板部１１は、芯基板部８の一面９に重ねられた第１重ね基板部１２と、他面１０に重ねられた第２重ね基板部１３とから構成されている。また、図３に示すように、巻き戻しコイル部５及び巻き進みコイル部６は、基板開口部４の外周に沿った巻回方向に沿って視たとき、巻き戻しコイル部５の導線で囲まれる領域と巻き進みコイル部６の導線で囲まれる領域とが一部重なり合うように配置されている。
【００２０】
巻き戻しコイル部５は、芯基板部８の一面９に基板開口部４の円周に沿って略放射状に配列され例えば金属箔で形成された複数の第１細線部である第１戻し細線部１４と、他面１０に基板開口部４の円周に沿って略放射状に配列され例えば金属箔で形成された複数の第２細線部である第２戻し細線部１５とを有している。第１戻し細線部１４は、図４に示すように絶縁性基板２の厚さ方向に沿って視たときに、基板開口部４側の一端部１４ａが第２戻し細線部１５の基板開口部４側の一端部１５ａに重なり、他端部１４ｂがこの重なった第２戻し細線部１５に隣接する第２戻し細線部１５の他端部１５ｂに重なるように配置されている。ここで、図２及び図４において、点線は第２戻し細線部１５を示している。他の各第１戻し細線部１４も同様に配置されている。従って、絶縁性基板２の厚さ方向に沿って視たときに、各第１戻し細線部１４及び各第２戻し細線部１５によって基板開口部４の周りに鋸歯状の模様が形成されている。
【００２１】
また、巻き戻しコイル部５は、芯基板部８を厚さ方向に貫通して第１戻し細線部１４の一端部１４ａ及び第２戻し細線部１５の一端部１５ａを電気的に接続する内径側接続細線部である内径側戻し接続細線部１６と、芯基板部８を厚さ方向に貫通して第１戻し細線部１４の他端部１４ｂ及び第２戻し細線部１５の他端部１５ｂを電気的に接続する外径側接続細線部である外径側戻し接続細線部１７とを有している。この内径側戻し接続細線部１６は、図４において重なっている第１戻し細線部１４の一端部１４ａと第２戻し細線部１５の一端部１５ａとを接続している。外径側戻し接続細線部１７は、同様に図４において重なっている他端部１４ｂと他端部１５ｂとを接続している。また、内径側戻し接続細線部１６及び外径側戻し接続細線部１７は、芯基板部８の厚さ方向に貫通した貫通孔に金属メッキをすることにより形成されている。
【００２２】
従って、巻き戻しコイル部５は、各第１戻し細線部１４及び各第２戻し細線部１５が各内径側戻し接続細線部１６及び各外径側戻し接続細線部１７によって電気的に直列に接続されて形成されているとともに、各第１戻し細線部１４が一面９に露出し、各第２戻し細線部１５が他面１０に露出した状態で芯基板部８に埋め込まれている。
【００２３】
巻き進みコイル部６は、芯基板部８の一面９に重ねられた第１重ね基板部１２の芯基板部８側と反対側の反芯基板部側の重ね面である第１重ね面１８に基板開口部４の外周に沿って略放射状に配列され例えば金属箔で形成された複数の第１細線部である第１進み細線部１９と、芯基板部８の他面１０に重ねられた第２重ね基板部１３の芯基板部８側と反対側の反芯基板部側の重ね面である第２重ね面２０に基板開口部４の外周に沿って略放射状に配列され例えば金属箔で形成された複数の第２細線部である第２進み細線部２１とを有している。
【００２４】
この第１進み細線部１９及び第２進み細線部２１の配置関係も、第１戻し細線部１４及び第２戻し細線部１５の配置関係と同様になっている。即ち、第１進み細線部１９は、図４に示すように、絶縁性基板２の厚さ方向に沿って視たときに、基板開口部４側の一端部１９ａが第２進み細線部２１の基板開口部４側の一端部２１ａに重なり、他端部１９ｂがこの一端部１９ａが重なった第２進み細線部２１に隣接する第２進み細線部２１の他端部２１ｂに重なるように配置されている。他の各第１進み細線部１９も同様に配置されている。ここで、図２及び図４において、点線は第２進み細線部２１を示している。従って、同様の方向に沿って視たときに、基板開口部４の周りには、第１戻し細線部１４及び第２戻し細線部１５と同様にして各第１進み細線部１９及び各第２進み細線部２１によっても鋸歯状模様が形成されている。ここで、各第１進み細線部１９の一端部１９ａ及び各第２進み細線部２１の一端部２１ａは、それぞれ各第１戻し細線部１４の一端部１４ａ及び各第２戻し細線部１５の一端部１５ａよりも基板開口部４に近づけて配置され、各第１進み細線部１９の他端部１９ｂ及び各第２進み細線部２１の他端部２１ｂも、それぞれ各第１戻し細線部１４の他端部１４ｂ及び各第２戻し細線部１５の他端部１５ｂよりも基板開口部４に近づけて配置されている。また、図４において、互いに重なっている他端部１９ｂ及び他端部２１ｂを有する第１進み細線部１９及び第２進み細線部２１がその他端部１９ｂ及び他端部２１ｂを始点としたベクトルであると考えると、そのベクトルの合成方向に基板開口部４の中心点が存在するように各第１進み細線部１９及び各第２進み細線部２１は設けられている。同様に、互いに重なっている他端部１４ｂ及び他端部１５ｂを有する第１戻し細線部１４及び第２戻し細線部１５をその他端部１４ｂ及び他端部１５ｂを始点としたベクトルであると考えて、そのベクトルの合成方向に基板開口部４の中心点が存在するように各第１戻し細線部１４及び各第２戻し細線部１５が設けられている。従って、各第１進み細線部１９、各第２進み細線部２１、各第１戻し細線部１４及び第２戻し細線部１５は、基板開口部４の中心点に向けては配置されていない。
【００２５】
また、巻き進みコイル部６は、芯基板部８、第１重ね基板部１２及び第２重ね基板部１３を厚さ方向に全て貫通して第１進み細線部１９の一端部１９ａ及び第２進み細線部２１の一端部２１ａを電気的に接続する内径側接続細線部である内径側進み接続細線部２２と、芯基板部８、第１重ね基板部１２及び第２重ね基板部１３を厚さ方向に全て貫通して第１進み細線部１９の他端部１９ｂ及び第２進み細線部２１の他端部２１ｂを電気的に接続する外径側進み接続細線部２３とを有している。この内径側進み接続細線部２２は、図４において重なっている第１進み細線部１９の一端部１９ａと第２進み細線部２１の一端部２１ａとを接続している。外径側進み接続細線部２３は、図４において重なっている他端部１９ｂと他端部２１ｂとを接続している。従って、図３に示すように、基板開口部４の外周に沿って視たときに、内径側進み接続細線部２２及び外径側進み接続細線部２３の間に内径側戻し接続細線部１６が配置され、内径側戻し接続細線部１６及び外径側戻し接続細線部１７の間に外径側進み接続細線部２３が配置されている。なお、内径側接続重ね細線部２２及び外径側接続重ね細線部２３は、芯基板部８、第１重ね基板部１２及び第２重ね基板部１３の厚さ方向に全て貫通した貫通孔に金属メッキをすることにより形成されている。
【００２６】
また、接続点７で一端部同士が接続された巻き戻しコイル部５及び巻き進みコイル部６の各他端部がコイル線３の引出部２５、２６となって絶縁性基板２に取り付けられた信号処理回路２７に電気的に接続されている。
【００２７】
この空芯コイル１は、以下のようにして作製される。まず、基板開口部４を有し、ドリル等によって複数の貫通孔が設けられた芯基板部８の一面９及び他面１０に金属箔の第１戻し細線部１４及び第２戻し細線部１５を両端部が貫通孔に接触するように略放射状にプリントする。そして、貫通孔に金属メッキをして巻き戻しコイル部５を形成する。次に、第１重ね基板部１２及び第２重ね基板部１３をそれぞれ一面９及び他面１０に貼り付けて基板を貫通する貫通孔をドリル等により所定の位置に形成する。その後、基本コイル部５と同様にして第１進み細線部１９及び第２進み細線部２１をそれぞれ第１重ね面１８及び第２重ね面２０にプリントし、貫通孔に金属メッキして巻き進みコイル部６を形成する。なお、接続点７の部分、引出部２５、２６の部分は、プリントする際、あるいは金属メッキする際に特別に形成する。その後、出来上がった絶縁性基板２に信号処理回路を取り付けて引出部２５、２６と電気的に接続する。
【００２８】
このように構成された空芯コイル１は、電流センサに用いられる場合、通常、基板開口部４に電流が流れる導体を貫通させて用いられる。導体を電流が流れると導体の軸線周りに磁界が発生し、この磁界の変化により巻き進みコイル部６及び巻き戻しコイル部５のそれぞれの巻き数に応じた誘導起電力が巻き戻しコイル部６及び巻き進みコイル部５のそれぞれに発生する。それぞれの誘導起電力は互いに打ち消し合わない、同じ向きになるように巻き進みコイル部６及び巻き戻しコイル部５が巻回されているので、両方の誘導起電力が足し合わされて大きな誘導電流がコイル線３を流れ、この誘導電流が信号処理回路２７で計測されて導体を流れる電流が算出される。
【００２９】
この空芯コイル１は、巻き進みコイル部６が基板開口部４の外周方向に沿った巻き進み方向に巻回され、巻き戻しコイル部５が巻き進みコイル部６の巻き進み方向とは逆方向に巻き戻していることから、この空芯コイル１は、コイル線３に発生する外部電磁界による誘導起電力を相殺する効果がある。また、図３に示される、巻き戻しコイル部５の導線によって囲まれる領域及び巻き進みコイル部６の導線によって囲まれる領域のそれぞれの位置及び面積を、内径側戻し接続細線部１６、外径側戻し接続細線部１７、内径側進み接続細線部２２及び外径側進み接続細線部２３の配置位置を移動させることにより容易に変更できることから、それぞれの領域が重なって共通する部分を大きくし、しかもその面積を一致させることにより、さらに外部電磁界による測定誤差を小さくすることができる。
【００３０】
また、巻き戻しコイル部５及び巻き進みコイル部６は、第１戻し細線部１４、第２戻し細線部１５、第１進み細線部１９及び第２進み細線部２１がそれぞれ異なる面に形成されていることから、各第１戻し細線部１４、各第２戻し細線部１５、各第１進み細線部１９及び各第２進み細線部２１をそれぞれの面で最大限、密に配列でき、コイル線３の巻回密度を大きくすることができる。このことから、空芯コイル１が用いられる電流センサの測定感度をさらに良くすることができる。
また、この空芯コイル１は、巻き戻しコイル部６及び巻き進みコイル部５の両方の誘導起電力が足し合わされているので、従来例の空芯コイル１００に比べて大きな誘導起電力を発生することができ、電流センサとしての測定感度がさらに良くなる。
【００３１】
また、この空芯コイル１においては、巻き進みコイル部６及び巻き戻しコイル部５の形成は絶縁性基板２の形成とともになされ、この巻き進みコイル部６及び巻き戻しコイル部５が絶縁性基板２に埋め込まれた状態で用いられるので、巻き進みコイル部６及び巻き戻しコイル部５それぞれの巻き間隔も一定に保つことができるとともに、巻き進みコイル部６と巻き戻しコイル部５とを貼り合わせる作業がないので、作業も容易になり、しかもコイル線３の巻き間隔も一定で測定誤差の小さい電流センサを作製することができる。
【００３２】
なお、この空芯コイル１は、コイル線３が巻き戻しコイル部５及び巻き進みコイル部６の２つのコイル部を有している構成となっているが、コイル部の数は２つに限定する必要はなく、３つ以上であっても構わない。この場合、複数のコイル部はすべて電気的に直列に接続され、導体に流れる電流によりコイル部に発生する誘導起電力の向きが電気的に同一となるようにそれぞれ巻回されている。また、重ね基板部１１は芯基板部８の一面９及び他面１０からそれぞれ順に複数のコイル部の数より１つ少ない数だけ重ねられて、各面に各コイル部の第１細線部あるいは第２細線部が形成されている。
【００３３】
また、上記実施の形態においては、巻き戻しコイル部５の内径側戻し接続細線部１６及び外径側戻し接続細線部１７は、それぞれ巻き進みコイル部６の内径側進み接続細線部２２及び外径側進み接続細線部２３よりも基板開口部４からみて離れた位置に配置されているが、このような配置位置に限定される必要はなく、それぞれ巻き進みコイル部６の内径側進み接続細線部２２及び外径側進み接続細線部２３よりも基板開口部４に近い位置に配置されていても構わない。このようにしても、図３の、巻き戻しコイル部５の導線によって囲まれる領域及び巻き進みコイル部６の導線によって囲まれる領域が重なって共通する部分を大きくでき、しかもその面積を一致させることもできる。
さらに、同様の理由で、巻き戻しコイル部５の内径側戻し接続細線部１６と外径側戻し接続細線部１７との間に、巻き進みコイル部６の内径側進み接続細線部２２及び外径側進み接続細線部２３が配置されるようにしても構わない。
【００３４】
また、上記実施の形態においては、使い勝手を良くするため信号処理回路２７が絶縁性基板２に設けられているが、当然のことながら、信号処理回路２７が別になっていても構わない。
【００３５】
実施の形態２．
図５は、この発明の実施の形態２に係る空芯コイルの構成を示す絶縁性基板の厚さ方向に視たときの模式的な正面図である。図５において、この実施の形態２に係る空芯コイル３１は、コイル線３２を備えている。この空芯コイル３１は、実施の形態１の空芯コイル１のコイル線３をコイル線３２に置き換えた構成となっており、コイル３２以外の他の構成は実施の形態１と同様である。
【００３６】
コイル線３２は、基板開口部４の外周に沿って導線が巻回されて構成された複数（例えば、２つ）のコイル部である巻き戻しコイル部３３及び巻き進みコイル部３４を有している。巻き戻しコイル部３３及び巻き進みコイル部３４は、それぞれ実施の形態１の巻き戻しコイル部５及び巻き進みコイル部６と同様の構成となっているが、それぞれの構成要素の形成箇所が異なっている。
【００３７】
即ち、図６は、コイル線３２を巻回方向に沿って視た状態の模式図である。図６において、巻き戻しコイル部３３は、複数の第１戻し細線部１４及び複数の第２戻し細線部１５を有し、各第１戻し細線部１４及び各第２戻し細線部１５を電気的に直列に接続する内径側戻し接続細線部１６及び外径側戻し接続細線部１７を有している。第１戻し細線部１４は芯基板部８の一面９に形成され、第２戻し細線部１５は第２重ね基板部１３の第２重ね面２０に形成されている。また、内径側戻し接続細線部１６及び外径側戻し接続細線部１７は、芯基板部８及び第２重ね基板部１３を貫通して形成されている。
【００３８】
巻き進みコイル部３４は、複数の第１進み細線部１９及び複数の第２進み細線部２１を有し、各第１進み細線部１９及び各第２進み細線部２１を電気的に直列に接続する内径側進み接続細線部２２及び外径側進み接続細線部２３を有している。第１進み細線部１９は第１重ね基板部１２の第１重ね面１８に形成され、第２進み細線部２１は芯基板部８の他面１０に形成されている。また、内径側進み接続細線部２２及び外径側進み接続細線部２３は、第１重ね基板部１２及び芯基板部８を貫通して形成されている。
また、コイル線３２をその巻回方向に沿って視た場合、巻き戻しコイル部３３の内径側戻し接続細線部１６及び外径側戻し接続細線部１７は、巻き進みコイル部３４の内径側進み接続細線部２２及び外径側進み接続細線部２３の間に配置されている。
【００３９】
従って、このような構成の空芯コイル３１は、第１重ね基板部１２あるいは第２重ね基板部１３の厚さを調整し、又は内径側戻し接続細線部１６、外径側戻し接続細線部１７、内径側進み接続細線部２２あるいは外径側進み接続細線部２３を空芯コイル３１の径方向に移動させることにより、実施の形態１と同様の効果を奏するとともに、空芯コイル３１の径方向の幅をさらに小さくすることができるので、例えば電流を測定すべき導体が隣接して配置されている場合のように導体の径方向に装着空間が制限されていても、この空芯コイル３１をその隣接した導体のそれぞれに装着することができ、測定が可能になる。
【００４０】
なお、実施の形態１と同様に、コイル線３２のコイル部は、２つに限定される必要はなく、３つ以上であっても構わない。この場合、芯基板部８には、一面９及び他面１０にそれぞれコイル部の数より１つ少ない数の重ね基板部が重ねられる。
【００４１】
また、図７に示すように、コイル線３２の巻回方向に沿って視たときの巻き戻しコイル部３３の外径側戻し接続細線部１７が巻き進みコイル部３４の外径側進み接続細線部２３よりも基板開口部４からみて外側に配置されてもよい。即ち、内径側進み接続細線部２２と外径側進み接続細線部２３との間に内径側戻り接続細線部１６が配置され、内径側戻り接続細線部１６と外径側戻り接続細線部１７との間に外径側進み接続細線部２３が配置されていてもよい。このようにすれば、空芯コイル３１の径方向及び厚さ方向の寸法調整が一度に可能になる。
【００４２】
実施の形態３．
図８は、この発明の実施の形態３に係る空芯コイルをそのコイル線の巻回方向に沿って視たときの模式図である。図８において、空芯コイル４１は、基板開口部４を有する絶縁性基板４２と、この絶縁性基板４２に設けられ基板開口部４の外周に沿って巻回されたコイル線４３とを備えている。
【００４３】
絶縁性基板４２は、芯基板部４４と、重ね基板部１１とを有している。重ね基板部１１は、実施の形態１と同様であり、芯基板部４４の一面９に重ねられた第１重ね基板部１２と、他面１０に重ねられた第２重ね基板部１３とから構成されている。芯基板部４４は、一面９を有する一面側芯基板分割部４５と、他面１０を有する他面側芯基板分割部４６とから構成されている。一面側芯基板分割部４５及び他面側芯基板分割部４６は、互いに対向して設けられた一面側対向面４７及び他面側対向面４８を有している。
【００４４】
コイル線４３は、基板開口部４の外周に沿って導線が巻回されて形成された巻き戻しコイル部４９及び巻き進みコイル部５０を有している。巻き戻しコイル部４９と巻き進みコイル部５０とは、電気的に直列に接続され、測定される電流による誘導起電力が電気的に同じ向きになるように巻回されている。
【００４５】
巻き戻しコイル部４９は、実施の形態１と同様に、一面９に形成された複数の第１戻し細線部１４と、他面１０に形成された複数の第２戻し細線部１５を有している。また、巻き戻しコイル部４９は、第１戻し細線部１４と第２戻し細線部１５とを電気的に直列に接続する内径側戻し接続細線部５１及び外径側戻し接続細線部５２を有している。
【００４６】
内径側戻し接続細線部５１は、一面側芯基板分割部４５を貫通する一面側接続分割部である一面側戻し接続分割部５３と、他面側芯基板分割部４６を貫通する他面側接続分割部である他面側戻し接続分割部５４とを有している。一面側戻し接続分割部５３は、一面側対向面４７に露出した例えば導電性ペーストの導体ランドである一面側導体ランド５５を有し、他面側戻し接続分割部５４は、他面側対向面４８に露出した例えば導電性ペーストの導体ランドである他面側導体ランド５６を有している。この一面側導体ランド５５と他面側導体ランド５６とが圧接し電気的接続がなされて、内径側戻し接続細線部５１が形成されている。
【００４７】
外径側戻し接続細線部５２も同様に、一面側芯基板分割部４５を貫通する一面側接続分割部である一面側戻し接続分割部５７と、他面側芯基板分割部４６を貫通する他面側接続分割部である他面側戻し接続分割部５８とを有している。一面側戻し接続分割部５７は、一面側対向面４７に露出した例えば導電性ペーストの導体ランドである一面側導体ランド５９を有し、他面側戻し接続分割部５８は、他面側対向面４８に露出した例えば導電性ペーストの導体ランドである他面側導体ランド６０を有している。この一面側導体ランド５９と他面側導体ランド６０とが圧接し電気的接続がなされて、外径側戻し接続細線部５２が形成されている。
【００４８】
巻き進みコイル部５０も、実施の形態１の巻き進みコイル部６と同様に、第１重ね面１８に形成された複数の第１進み細線部１９と、第２重ね面２０に形成された複数の第２進み細線部２１を有している。また、巻き進みコイル部５０は、第１進み細線部１９と第２進み細線部２１とを電気的に直列に接続する内径側進み接続細線部６１及び外径側進み接続細線部６２を有している。
【００４９】
内径側進み接続細線部６１は、一面側芯基板分割部４５を貫通する一面側接続分割部である一面側進み接続分割部６３と、他面側芯基板分割部４６を貫通する他面側接続分割部である他面側進み接続分割部６４とを有している。一面側進み接続分割部６３は、一面側対向面４７に露出した例えば導電性ペーストの導体ランドである一面側導体ランド６５を有し、他面側進み接続分割部６４は、他面側対向面４８に露出した例えば導電性ペーストの導体ランドである他面側導体ランド６６を有している。この一面側導体ランド６５と他面側導体ランド６６とが圧接し電気的接続がなされて、内径側戻し接続細線部６１が形成されている。
【００５０】
外径側進み接続細線部６２も同様に、一面側芯基板分割部４５を貫通する一面側接続分割部である一面側進み接続分割部６７と、他面側芯基板分割部４６を貫通する他面側接続分割部である他面側進み接続分割部６８とを有している。一面側進み接続分割部６７は、一面側対向面４７に露出した例えば導電性ペーストの導体ランドである一面側導体ランド６９を有し、他面側進み接続分割部６８は、他面側対向面４８に露出した例えば導電性ペーストの導体ランドである他面側導体ランド７０を有している。この一面側導体ランド６９と他面側導体ランド７０とが圧接し電気的接続がなされて、外径側進み接続細線部６２が形成されている。
他の構成は実施の形態１と同様である。
【００５１】
ここで、一般に空芯コイルは、上述のように、測定されるべき導体を中央に貫通させ、その導体に流れる電流によって発生する磁束が導体の軸線周りに沿って巻回されたコイル線に鎖交してコイル線に誘導起電力を発生させることにより、その導体に流れる電流を測定する。従って、コイル線に鎖交する磁束が大きいほどコイル線に発生する誘導起電力も大きくなる。この鎖交する磁束の量は、巻回方向に沿って視たときのコイル線の導線に囲まれる領域の面積が大きいほど、多くなる。また、通常、この測定される導体は、平行に隣接して複数配置されることが多いため、空芯コイルは導体に装着する際に導体の軸線方向ではなく径方向の距離の制約を受けやすい。このようなことから、上記の導線に囲まれる領域の面積を大きくするために、その領域の形状が導体の軸線方向に沿って細長く形成される場合がある。
【００５２】
絶縁性基板に形成されたコイル線は、この絶縁性基板にドリル等で貫通孔を形成し金属メッキをすることで上記軸線方向に沿った導線を形成している。しかしながら、この貫通孔の距離が大きくなると、ドリルが折れやすくなる等の不都合が発生するためドリル径が大きくなり、それだけ貫通孔の径も大きくなる。貫通孔の径が大きくなると、それだけ体積をとり絶縁性基板に形成されるコイル線の巻回数が少なくなる。
【００５３】
この実施の形態に係る空芯コイル４１では、内径側戻し接続細線部５１、外径側戻し接続細線部５２、内径側進み接続細線部６１及び外径側進み接続細線部６２は、それぞれ一面側戻し接続細線部５３，５７、一面側進み接続細線部６３，６７と、他面側戻し接続細線部５４，５８、他面側進み接続細線部６４，６８とが一面側対向面４７及び他面側対向面４８の間で電気的に接続されて形成されていることから、ドリルによって一度に内径側戻し接続細線部５１、外径側戻し接続細線部５２、内径側進み接続細線部６１及び外径側進み接続細線部６２の長さの貫通孔を形成する必要はなくなり、一面側戻し接続細線部５３，５７、一面側進み接続細線部６３，６７、他面側戻し接続細線部５４，５８、及び他面側進み接続細線部６４，６８の貫通孔をそれぞれ個別に形成することができるようになる。一面側戻し接続細線部５３，５７、一面側進み接続細線部６３，６７、他面側戻し接続細線部５４，５８、及び他面側進み接続細線部６４，６８の長さは、内径側戻し接続細線部５１、外径側戻し接続細線部５２、内径側進み接続細線部６１及び外径側進み接続細線部６２の長さよりも短いので、それだけ細いドリルで貫通孔を形成でき、巻き数を多くできる。
【００５４】
また、内径側戻し接続細線部５１、外径側戻し接続細線部５２、内径側進み接続細線部６１及び外径側進み接続細線部６２は、それぞれ一面側戻し接続細線部５３，５７、一面側進み接続細線部６３，６７と、他面側戻し接続細線部５４，５８、他面側進み接続細線部６４，６８とが電気的に接続されて全体として長くなるので、それだけ測定される導体の径方向の距離の制約に関係なく図８における上記のコイル線の導線に囲まれる領域の面積を大きくすることができる。
【００５５】
なお、図８における巻き戻しコイル部４９と巻き進みコイル部５０との配置関係は、実施の形態２における巻き戻しコイル部３３と巻き進みコイル部３４との配置関係であっても、同様の効果を奏し、また、それぞれのコイル部の接続細線部が芯基板部４４を貫通する構成となっていれば、例えば巻き進みコイル部が巻き戻しコイル部を囲んで巻回されている構成であっても構わない。
【００５６】
また、実施の形態１と同様に、コイル線４３のコイル部は、２つに限定される必要はなく、３つ以上であっても構わない。この場合、芯基板部４４には、一面９及び他面１０にそれぞれコイル部の数より１つ少ない数の重ね基板部が重ねられる。
【００５７】
なお、上記各実施の形態において、測定される導体は、空芯コイルの基板開口部を貫通するようになっているが、この導体８０を基板開口部の外周に沿ったコイル線の巻回方向に沿ってコイル線を囲みつつ巻き進むようにすれば、コイル線に鎖交する磁束量が増加するので、それだけ測定感度が向上する。この場合、導体は、図９に示すように、例えば銅メッキによりエポキシ樹脂等の絶縁体を塗布した空芯コイルの表面に形成されて構成されてもよい。このようにすることにより、導体８０とコイル線との位置関係が一定になってさらにコイル線に鎖交する磁束量を安定させることができる。
【００５８】
また、上記各実施の形態において、空芯コイルは、絶縁性基板及びコイル線によって円環状に形成されているが、その一部が切り離し可能となっていても構わない。即ち、円環状の空芯コイルは、図１０に示すように、略Ｃ形の分割部である主分割部８１と、この主分割部８１の両端に着脱可能に取り付けられた分割部である切り離し分割部８２とから構成され、主分割部８１及び切り離し分割部８２により全体として円環形状を形成するようになっていても構わない。このような構成であれば、測定される導体を空芯コイルの基板開口部に貫通させる際にわざわざ導体の端部から開口部に挿入させなくても、切り離し分割部８２を主分割部８２から切り離してできた空間から導体を挿入することができるので、既設の導体等のように導体の切断が困難な場合等でも空芯コイルを容易に装着することができる。
【００５９】
主分割部８１と切り離し分割部８２とを接続するために、主分割部８１と切り離し分割部８２の構成が例えば以下のようになっていてもよい。即ち、図１１は、主分割部８１及び切り離し分割部８２が互いに切り離されている状態のそれぞれの端部を模式的に示す部分斜視図であり、図１２は、図１１の矢印８３に沿って視たときのコイル線の接続細線部を形成する貫通孔の状態を示す模式図である。図１０乃至図１２において、主分割部８１の端部はステップ面８４を有する階段状の係合部８５となっており、切り離し分割部８２の端部はステップ面８６を有する階段状の係合部８７となっている。主分割部８１及び切り離し分割部８２が接続される際には、ステップ面８４とステップ面８６とが互いに対向して配置される。切り離し分割部８２の係合部８７には、貫通孔内に形成されるとともにステップ面８４から突出した導電性の接続手段であるピン８８が設けられている。また、主分割部８１の係合部８５には、内面に金属メッキされた貫通孔８９が形成されており、主分割部８１及び切り離し分割部８２が接続される際に、この貫通孔８９にピン８８の突出した部分が挿入されるようになっている。ピン８８は、貫通孔８９に挿入される際に貫通孔８９内面に形成された金属メッキに接触するようになっており、ピン８８及び貫通孔８９内面の金属メッキによりコイル線の接続細線部が構成されるようになっている。このようにして、主分割部８１及び切り離し分割部８２は、コイル線の電気的接続がなされるとともに機械的にも接続されるようになっている。
【００６０】
このピン８８は、主分割部８１の係合部８５に設けられていてもよく、この場合、切り離し分割部８２の係合部８６には、内面に金属メッキされた貫通孔８９が形成される。
また、空芯コイルは、主分割部８１及び切り離し分割部８２の２つの分割部から構成されることに限定される必要はなく、３つ以上の分割部から構成されていても構わない。
【００６１】
【発明の効果】
以上の説明から明らかなように、この発明に係る空心コイルは、導体に流れる電流を測定するために用いられる空芯コイルであって、中央に基板開口部を有した絶縁性基板と、前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により各前記コイル部に発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ１段ずつ重ねられた重ね基板部とを有し、各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有しており、各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列され、前記巻回方向に沿って視たときに、一方の前記コイル部の前記第１細線部と前記第２細線部との間に、他方の前記コイル部の前記第１細線部あるいは前記第２細線部のいずれかが配置されているので、前記導線間隔のピッチが一定の前記コイル線を容易に形成できるとともに、互いに重なり合う前記領域が存在することにより、外部電磁界が各前記コイル部の共通する領域を通るようにすることができ、また各前記コイル部の前記領域の面積を同一に調整することもでき、前記外部電磁界が場所ごとで異なる変化をしていてもその変化に対応して各前記コイル部に互いに相殺する誘導起電力を発生させる効果が大きくなる。また、前記巻回方向に沿って視たときに、前記一方のコイル部の前記領域と前記他方のコイル部の前記領域とを一部重ね合わせて容易に配置させることができる。
【００６２】
また、導体に流れる電流を測定するために用いられる空芯コイルであって、中央に基板開口部を有した絶縁性基板と、前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により各前記コイル部に発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ１段ずつ重ねられた重ね基板部とを有し、各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有しており、各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列され、前記巻回方向に沿って視たときに、一方の前記コイル部の前記内径側接続細線部と前記外径側接続細線部との間に、他方の前記コイル部の前記内径側接続細線部あるいは前記外径側接続細線部のいずれかが配置されているので、前記導線間隔のピッチが一定の前記コイル線を容易に形成できるとともに、互いに重なり合う前記領域が存在することにより、外部電磁界が各前記コイル部の共通する領域を通るようにすることができ、また各前記コイル部の前記領域の面積を同一に調整することもでき、前記外部電磁界が場所ごとで異なる変化をしていてもその変化に対応して各前記コイル部に互いに相殺する誘導起電力を発生させる効果が大きくなる。また、前記巻回方向に沿って視たときに、前記一方のコイル部の前記領域と前記他方のコイル部の前記領域とを一部重ね合わせて容易に配置させることができる。
【００６３】
また、導体に流れる電流を測定するために用いられる空芯コイルであって、中央に基板開口部を有した絶縁性基板と、前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ同数段重ねられた重ね基板部とを有し、前記芯基板部は、前記一面を有する一面側芯基板分割部と、前記他面を有する他面側芯基板分割部とから構成されており、各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有し、前記内径側接続細線部及び前記外径側接続細線部は、それぞれ前記一面側芯基板分割部及び前記他面側芯基板部の間で一面側接続分割部及び他面側接続分割部に分割されており、前記一面側接続分割部及び前記他面側接続分割部は、互いに電気的に接続する導体ランドを前記一面側接続分割部と前記他面側接続分割部との間にそれぞれ有しており、各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列されているので、前記内径側接続細線部及び前記外径側接続細線部を分割して作製でき、容易に前記内径側接続細線部及び前記外径側接続細線部の長さを長くして、前記軸線周りに沿って視たときの前記導線によって囲まれる領域の面積を大きくすることができる。
【００６７】
また、前記巻回方向に沿って視たときに、前記導体が前記コイル線を囲んで絶縁体を介して少なくとも１回巻回されているので、前記巻回方向に沿って視たときの前記コイル線の前記導線に囲まれる領域に前記導体を流れる電流により発生する磁束がさらに多く通り、前記コイル線に流れる誘導起電力が大きくなって測定感度が向上する。
【００６８】
また、前記基板開口部の径方向に沿って複数に分割された分割部から構成された空芯コイルであって、各前記分割部は、前記組み合わせられる際にそれぞれの前記導線を互いに着脱可能に電気的及び機械的に接続する接続手段を有しているので、前記基板開口部に前記導体を貫通させる際に、前記導体を切断する必要なく、前記空芯コイルを前記分割部に分割して容易に前記導体を前記基板開口部に貫通させることができる。
【図面の簡単な説明】
【図１】 この発明の実施の形態１に係る空芯コイルの構成を示す部分斜視図である。
【図２】 コイル線の構成を示す部分拡大図である。
【図３】 図２の空芯コイルをそのコイル線の巻回方向に沿って視たときの模式図である。
【図４】 絶縁性基板の厚さ方向に視たときの空芯コイルの模式的な正面図である。
【図５】 この発明の実施の形態２に係る空芯コイルの構成を示す絶縁性基板の厚さ方向に視たときの模式的な正面図である。
【図６】 図５の空芯コイルをそのコイル線の巻回方向に沿って視たときの模式図である。
【図７】 この発明の実施の形態２の変形例の空芯コイルをそのコイル線の巻回方向に沿って視たときの模式図である。
【図８】 この発明の実施の形態３に係る空芯コイルをそのコイル線の巻き線方向に沿って視たときの模式図である。
【図９】 空芯コイルに導体を巻き付けた状態を示す正面図である。
【図１０】 分割部によって構成された空芯コイルの正面図である。
【図１１】 主分割部及び切り離し分割部が互いに切り離されている状態のそれぞれの端部を模式的に示す部分斜視図である。
【図１２】 図１１の矢印８３に沿って視たときのコイル線の接続細線部を形成する貫通孔の状態を示す模式図である。
【図１３】 従来の空芯コイルの構成を示す模式的な斜視図である。
【符号の説明】
１，３１，４１ 空芯コイル、２，４２ 絶縁性基板、３，３２，４３ コイル線、４ 基板開口部、５，３３，４９ 巻き戻しコイル部（コイル部）、６，３４，５０ 巻き進みコイル部（コイル部）、８，４４ 芯基板部、９ 一面、１０ 他面、１１ 重ね基板部（１２ 第１重ね基板部、１３ 第２重ね基板部）、１４ 第１戻し細線部（第１細線部）、１５ 第２戻し細線部（第２細線部）、１６，５１ 内径側戻し接続細線部（内径側接続細線部）、１７，５２ 外径側戻し接続細線部（外径側接続細線部）、１８ 第１重ね面（重ね面）、１９第１進み細線部（第１細線部）、２０ 第２重ね面（重ね面）、２１ 第２進み細線部（第２細線部）、２２，６１ 内径側進み接続細線部（内径側接続細線部）、２３，６２ 外径側進み接続細線部（外径側接続細線部）、４５ 一面側芯基板分割部、４６ 他面側芯基板分割部、５３，５７ 一面側戻し接続分割部（一面側接続分割部）、５４，５８ 他面側戻し接続分割部（他面側接続分割部）、５５，５９ 一面側導体ランド（導体ランド）、５６，６０ 他面側導体ランド（導体ランド）、６３，６７ 一面側進み接続分割部（一面側接続分割部）、６４，６８ 他面側進み接続分割部（他面側接続分割部）、６５，６９ 一面側導体ランド（導体ランド）、６６，７０ 他面側導体ランド（導体ランド）、８１ 主分割部（分割部）、８２ 切り離し分割部（分割部）。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air-core coil used in, for example, a current sensor, and more particularly to an air-core coil formed using an insulating substrate.
[0002]
[Prior art]
In general, an air-core coil is often used for a current sensor that measures a current flowing in a conductor. The air-core coil is formed by winding a conducting wire around a non-magnetic core. In this current sensor, an air-core coil is disposed around the conductor. When a current flows through the conductor, a magnetic flux is generated around the conductor. When this magnetic flux intersects with the conductor of the air-core coil, an induced current proportional to the change in the magnetic flux flows through the conductor of the air-core coil. The current sensor derives the current in the conductor by measuring this induced current. Since the air-core coil does not have a magnetic iron core or the like, there is no magnetic saturation caused by an iron core or the like, and when used in a current sensor, a wide current range can be measured.
[0003]
FIG. 13 is a schematic perspective view showing a configuration of a conventional air-core coil. In FIG. 13, the air-core coil 100 includes a substrate 101 that is a non-magnetic material such as a resin, and a coil wire 102 provided on the substrate 101. The substrate 101 has a circular substrate opening 103 through which a conductor passes. The coil wire 102 is formed by winding a conductive thin wire 104 such as a metal foil around the substrate opening 103 along the circumferential direction. The coil wire 102 includes a plurality of fine wire portions 104a provided substantially radially from the substrate opening 103 on both surfaces of the substrate 101, and a plurality of end portions of the thin wire portions 104a on both surfaces penetrating through the substrate 101. And a connecting thin wire portion 104b. The connecting thin wire portion 104b is formed by metal plating in a through hole penetrating the substrate 101 in the thickness direction. The coil wire 102 is configured by electrically connecting a plurality of fine wire portions 104 a provided on both surfaces of the substrate 101 in series by connection thin wire portions 104 b penetrating the substrate 101. Therefore, the coil wire 102 is embedded in the substrate 101 with the thin wire portions 104a exposed on both surfaces of the substrate 101.
[0004]
The air-core coil 100 generates an induced current not only by a magnetic field generated by a current flowing through a conductor but also by an external magnetic field. The induced current due to the external magnetic field becomes an obstacle to measuring the current of the conductor, and causes a measurement error of the current sensor. As a method for suppressing the generation of the induced current due to the external magnetic field, an induced electromotive force generated in the coil wire 102 by connecting the coil wire rewound in the direction opposite to the winding advance direction of the coil wire 102 to the coil wire 102 and There is a method of canceling the induced electromotive forces by generating reverse induced electromotive forces in a coiled wire. Therefore, the air-core coil 100 includes an air-core coil 100 ′ having a coil wire 102 and a substrate 101 ′ that are mirror-symmetrical to the coil wire 102 and the substrate 101, respectively, in order to suppress the generation of an induced current due to an external magnetic field. Is affixed to the air-core coil 100 and used for a current sensor. That is, the coil wire 102 and the rewinding coil wire are electrically connected in series, and the substrate opening 103 ′ of the substrate 101 ′ is aligned with the substrate opening 103 as shown in the figure. When the substrate 101 'is bonded to each other, the coil wire to be wound back in the direction opposite to the winding advance direction of the coil wire 102 is arranged in a mirror symmetry, and induced by an external magnetic field and an external electric field (hereinafter referred to as an external electromagnetic field). A current sensor is configured to cancel the power. Here, since the substrate 101 and the substrate 101 ′ are provided with the fine wire portion 104a ′ and the fine wire portion 104a exposed to the outside on the surfaces to be bonded to each other, the substrate 101 and the substrate 101 ′ can be prevented from being short-circuited. An insulating layer is interposed between them.
[0005]
The air-core coil 100 has such a configuration, and since the coil wire 102 is provided on the substrate 101, the winding interval of the coil wire 102, that is, the interval between the adjacent thin wire portions 104a is easily made constant. be able to. Therefore, the magnetic flux generated by the current flowing in the conductor to be measured can generate the induced electromotive force evenly in the coil wire 102, and the measurement accuracy of the current sensor is high.
Further, since the air-core coil 100 is used by being bonded to the air-core coil 100 ′, the induced electromotive force due to the external electromagnetic field is canceled out, and the measurement error due to the external electromagnetic field of the current sensor is suppressed.
[0006]
[Problems to be solved by the invention]
However, if the coil wire 102 is at a different position from the rewinding coil wire, a difference occurs between the induced electromotive force generated in the coil wire 102 and the induced electromotive force generated in the rewinded coil wire. Are not canceled out, and part of the induced electromotive force due to the external electromagnetic field remains. Therefore, in order to reduce the measurement error due to the external electromagnetic field, it is necessary to make the arrangement positions of the coil wire 102 and the rewinding coil wire as close as possible, but in the conventional example, the air core coil 100 and the air core coil 100 ′ Since there is a method of adhering to each other, there is a problem in that there is a limit in bringing the arrangement positions of the coil wire 102 and the rewinding coil wire closer.
[0007]
Further, in the method of bonding the air core coil 100 and the air core coil 100 ′, a resin or the like is interposed between the air core coil 100 and the air core coil 100 ′ in order to prevent a short circuit between the coil wire 102 and the rewinding coil wire. Insulating layer must be interposed. Accordingly, time and labor are required, and it is difficult to produce a large number of current sensors by bonding the air core coil 100 and the air core coil 100 '.
[0008]
In addition, when the number of turns of the coil wire 102 in the air-core coil 100 is increased, an induced electromotive force is generated in that much portion, so that the measurement sensitivity of the current sensor is increased. For this reason, the coil wire 102 has a winding interval as close as possible to increase the number of turns. However, there is a limit to making the winding interval of the coil wire 102 dense, because the thickness of the coil wire 102 itself is limited, and the air core coil 100 'is bonded to the air core coil 100 to increase the number of turns. However, since the above-described problem occurs due to the bonding of the air-core coil 100 and the air-core coil 100 ′, the number of turns of the air-core coil 100 can be increased to easily further increase the measurement sensitivity of the current sensor. There was a problem that it was difficult.
[0009]
Therefore, the present invention has an object to solve the above-described problems, and can be easily manufactured, has a large number of turns, and can further suppress the generation of induced electromotive force due to an external electromagnetic field. It aims at obtaining the air core coil of.
[0010]
[Means for Solving the Problems]
  An air-core coil according to the present invention is an air-core coil used for measuring a current flowing through a conductor, and includes an insulating substrate having a substrate opening in the center, the insulating substrate, and the substrate opening. A plurality of coil portions formed by winding a conductive wire along the axis of the portion, and regions surrounded by the conductive wires of each of the coil portions when viewed along the winding direction are part of each other The coil portions are arranged in an overlapping manner, and the coil portions are connected in series so that the induced electromotive forces generated in the coil portions by the current flowing through the conductor are in the same electrical direction. The insulating substrate is formed from a core substrate portion through which the conductive wire of each coil portion penetrates, and one surface and the other surface of the core substrate portion, respectively.One step at a timeEach of the coil portions is arranged around the axis on either the overlapping surface on the side opposite to the core substrate portion or the one surface of the overlapping substrate portion that is overlapped on the one surface side. A plurality of first thin wire portions arranged in a substantially radial manner, an overlap surface on the side opposite to the core substrate portion of the overlap substrate portion overlaid on the other surface side, and the other surface substantially radially around the axis A plurality of second thin wire portions, an inner diameter side connecting thin wire portion that electrically connects one end portion of the first thin wire portion and one end portion of the second thin wire portion, and the other end of the first thin wire portion. And an outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion electrically connected to the inner diameter side connecting thin wire portion. Each of the first thin wire portions is arranged on a different surface for each of the coil portions, and each of the second thin wire portions is They are arranged in different planes for each serial coil unitWhen viewed along the winding direction, between the first thin wire portion and the second thin wire portion of one of the coil portions, the first thin wire portion or the second of the other coil portion. One of the thin line portions is arranged.
[0011]
  Also,An air-core coil used for measuring a current flowing through a conductor, and having an insulating substrate having a substrate opening in the center, and a conductor provided along the axis of the substrate opening provided on the insulating substrate The coil portions are arranged such that the regions surrounded by the conductive wires of the coil portions partially overlap each other when viewed along the winding direction. And a coil wire configured such that the coil portions are connected in series so that the induced electromotive forces generated in the coil portions by the current flowing through the conductor are in the same electrical direction, The insulating substrate includes a core substrate portion through which the conductive wire of each coil portion penetrates, and an overlapping substrate portion that is overlapped one by one from one surface and the other surface of the core substrate portion, and each coil portion Is heavy on the one side. A plurality of first thin wire portions arranged substantially radially around the axis on one of the overlapping surface on the opposite side of the core substrate portion side and the one surface of the overlapped substrate portion, and the other surface side. A plurality of second fine wire portions arranged substantially radially around the axis, one end portion of the first fine wire portion, and the first on the overlap surface on the side opposite to the core substrate portion side of the overlap substrate portion and the other surface The inner diameter side connecting thin wire portion electrically connecting one end portion of the two thin wire portions, and the first end portion electrically connected to the other end portion of the first thin wire portion and the inner diameter side connecting thin wire portion. It has an outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the two thin wire portions, and each of the first thin wire portions is arranged on a different surface for each of the coil portions. Each of the second thin wire portions is arranged on a different surface for each of the coil portions and viewed along the winding direction. In addition, between the inner diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion of one of the coil portions, either the inner diameter side connecting thin wire portion or the outer diameter side connecting thin wire portion of the other coil portion. Is arranged.
[0012]
  Also,An air-core coil used for measuring a current flowing through a conductor, and having an insulating substrate having a substrate opening in the center, and a conductor provided along the axis of the substrate opening provided on the insulating substrate The coil portions are arranged such that the regions surrounded by the conductive wires of the coil portions partially overlap each other when viewed along the winding direction. And each coil portion is connected in series so that the induced electromotive forces generated by the current flowing through the conductor are in the same electrical direction, and the insulating substrate comprises: And a core substrate portion through which the conducting wire of each coil portion penetrates, and an overlapping substrate portion that is stacked in the same number from one surface and the other surface of the core substrate portion, and the core substrate portion has the one surface. Single-sided core substrate division And the other surface side core substrate dividing portion having the other surface, and each coil portion is overlapped on the one surface side of the overlapping substrate portion on the side opposite to the core substrate portion side and the one surface Any one of the plurality of first thin wire portions arranged substantially radially around the axis, the overlapping surface on the side opposite to the core substrate portion of the overlapping substrate portion stacked on the other surface side, and the other surface A plurality of second thin wire portions arranged substantially radially around the axis, an inner diameter side connecting thin wire portion for electrically connecting one end portion of the first thin wire portion and one end portion of the second thin wire portion, In addition, the other end portion of the first thin wire portion and the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion electrically connected to the inner diameter side connecting thin wire portion are electrically connected. The outer diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion are connected to the outer diameter side connecting thin wire portion. Each of the one-side-side core substrate dividing portion and the other-side-side core substrate portion is divided into a one-surface-side connection dividing portion and an other-surface-side connection dividing portion, and the one-surface-side connection dividing portion and the other-surface-side connection The division part has conductor lands that are electrically connected to each other between the one-surface-side connection division part and the other-surface-side connection division part, and each of the first thin wire parts is different for each coil part. The second thin line portions are arranged on a surface, and are arranged on different surfaces for each of the coil portions.
[0016]
Further, when viewed along the winding direction, the conductor is wound at least once around the coil wire via an insulator.
[0017]
In addition, the air-core coil is composed of a plurality of divided portions divided along the radial direction of the substrate opening, and each of the divided portions can be attached to and detached from each other when being combined. Connection means for electrical and mechanical connection is provided.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a partial perspective view showing a configuration of an air-core coil according to Embodiment 1 of the present invention. In FIG. 1, an air-core coil 1 includes an insulating substrate 2 made of a nonmagnetic material such as a resin, and a coil wire 3 provided on the insulating substrate 2. The insulating substrate 2 is a disc having a substrate opening 4 through which a conductor passes in the center. The substrate opening 4 has a circular shape along the axis of the penetrating conductor. The coil wire 3 includes a rewinding coil unit 5 and a winding coil unit 6 which are a plurality of (for example, two) coil units configured by winding a conductive wire along the outer periphery of the substrate opening 4. ing. The rewinding coil unit 5 and the winding-up coil unit 6 are electrically connected in series at a connection point 7. The rewinding coil unit 5 and the rewinding coil unit 6 are wound so that the induced electromotive forces generated in the respective coil units by the current flowing through the conductors are in the same electrical direction.
[0019]
FIG. 2 is a partially enlarged view showing the configuration of the coil wire 3, and FIG. 3 shows the arrangement state of the rewinding coil unit 5 and the winding advance coil unit 6 when viewed along the winding direction of the coil wire 3. It is a schematic diagram shown. In FIG. 2, the coil wire 3 in the vicinity of the connection point 7 between the rewinding coil unit 5 and the rewinding coil unit 6 is shown. FIG. 4 is a schematic front view of the air-core coil 1 when viewed in the thickness direction of the insulating substrate. 1 to 4, the insulating substrate 2 is formed on the core substrate portion 8 through which the lead wires of the rewinding coil portion 5 and the winding advance coil portion 6 penetrate, and one surface 9 and the other surface 10 of the core substrate portion 8, respectively. And an overlapping substrate portion 11 that is stacked one by one. The overlapping substrate portion 11 is composed of a first overlapping substrate portion 12 overlapped on one surface 9 of the core substrate portion 8 and a second overlapping substrate portion 13 overlapped on the other surface 10. Further, as shown in FIG. 3, the rewinding coil unit 5 and the winding advance coil unit 6 are surrounded by the conducting wire of the rewinding coil unit 5 when viewed along the winding direction along the outer periphery of the substrate opening 4. The region to be wound and the region surrounded by the conducting wire of the winding coil portion 6 are arranged so as to partially overlap.
[0020]
The rewinding coil portion 5 is a first return thin wire portion that is a plurality of first thin wire portions that are substantially radially arranged on the one surface 9 of the core substrate portion 8 along the circumference of the substrate opening portion 4 and formed of, for example, metal foil. 14 and a second return thin wire portion 15 which is a plurality of second thin wire portions formed of, for example, a metal foil, which are arranged substantially radially along the circumference of the substrate opening 4 on the other surface 10. As shown in FIG. 4, the first return thin wire portion 14 has a substrate opening portion of the second return thin wire portion 15 whose one end portion 14 a on the substrate opening portion 4 side is viewed along the thickness direction of the insulating substrate 2. It is arranged so as to overlap one end portion 15a on the 4th side, and the other end portion 14b overlaps the other end portion 15b of the second return thin wire portion 15 adjacent to the overlapped second return thin wire portion 15. Here, in FIG.2 and FIG.4, the dotted line has shown the 2nd return thin wire | line part 15. FIG. The other first return thin wire portions 14 are similarly arranged. Accordingly, when viewed along the thickness direction of the insulating substrate 2, a saw-tooth pattern is formed around the substrate opening 4 by the first return thin wire portions 14 and the second return thin wire portions 15. .
[0021]
Further, the rewinding coil portion 5 penetrates the core substrate portion 8 in the thickness direction and electrically connects the one end portion 14a of the first return thin wire portion 14 and the one end portion 15a of the second return thin wire portion 15. An inner diameter side return connecting thin wire portion 16 which is a connecting thin wire portion, and the other end portion 14b of the first return thin wire portion 14 and the other end portion 15b of the second return thin wire portion 15 penetrating the core substrate portion 8 in the thickness direction. It has an outer diameter side return connecting thin wire portion 17 that is an outer diameter side connecting thin wire portion that is electrically connected. The inner diameter side return connecting thin wire portion 16 connects the one end portion 14a of the first return thin wire portion 14 and the one end portion 15a of the second return thin wire portion 15 that overlap in FIG. Similarly, the outer diameter side return connecting thin wire portion 17 connects the other end portion 14b and the other end portion 15b that overlap in FIG. Further, the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17 are formed by performing metal plating on a through hole penetrating in the thickness direction of the core substrate portion 8.
[0022]
Accordingly, in the rewinding coil unit 5, each first return thin wire portion 14 and each second return thin wire portion 15 are electrically connected in series by each inner diameter side return connection thin wire portion 16 and each outer diameter side return connection thin wire portion 17. In addition, each first return thin wire portion 14 is exposed on one surface 9 and each second return thin wire portion 15 is exposed on the other surface 10 and is embedded in the core substrate portion 8.
[0023]
The winding coil portion 6 is formed on a first overlapping surface 18 that is an overlapping surface on the side opposite to the core substrate portion 8 of the first overlapping substrate portion 12 that is overlapped with one surface 9 of the core substrate portion 8. A plurality of first advanced thin wire portions 19 which are a plurality of first thin wire portions arranged in a substantially radial manner along the outer periphery of the substrate opening 4 and formed of, for example, a metal foil, and a first overlapped portion on the other surface 10 of the core substrate portion 8. The second overlapping surface 20, which is the overlapping surface on the opposite side of the core substrate portion 8 side of the two-layer substrate portion 13, is arranged substantially radially along the outer periphery of the substrate opening 4 and is formed of, for example, a metal foil. And a plurality of second fine wire portions 21 which are a plurality of second fine wire portions.
[0024]
The arrangement relationship between the first advance thin wire portion 19 and the second advance thin wire portion 21 is the same as the arrangement relationship between the first return thin wire portion 14 and the second return thin wire portion 15. That is, as shown in FIG. 4, the first advanced thin wire portion 19 has one end 19 a on the substrate opening 4 side of the second advanced thin wire portion 21 when viewed along the thickness direction of the insulating substrate 2. It is arranged so as to overlap the one end 21a on the substrate opening 4 side, and the other end 19b overlaps the other end 21b of the second advanced fine line 21 adjacent to the second advanced fine line 21 where the one end 19a overlaps. ing. Each other 1st advance fine wire part 19 is also arrange | positioned similarly. Here, in FIGS. 2 and 4, the dotted line indicates the second advanced thin line portion 21. Accordingly, when viewed along the same direction, each of the first advanced thin wire portions 19 and each of the second return wire portions 19 and the second return thin wire portions 15 is formed around the substrate opening 4 in the same manner as the first return thin wire portion 14 and the second return thin wire portion 15. A sawtooth pattern is also formed by the leading thin wire portion 21. Here, one end portion 19a of each first advance thin wire portion 19 and one end portion 21a of each second advance thin wire portion 21 are respectively one end portion 14a of each first return thin wire portion 14 and one end portion of each second return thin wire portion 15. The other end portion 19b of each first advance fine wire portion 19 and the other end portion 21b of each second advance thin wire portion 21 are also arranged closer to the substrate opening 4 than the portion 15a. The other end portion 14 b and the other end portion 15 b of each second return thin wire portion 15 are disposed closer to the substrate opening 4. Further, in FIG. 4, the first advance fine wire portion 19 and the second advance fine wire portion 21 having the other end portion 19b and the other end portion 21b overlapping each other are vectors having the other end portion 19b and the other end portion 21b as starting points. Assuming that there is one, each first advance fine wire portion 19 and each second advance thin wire portion 21 are provided so that the center point of the substrate opening 4 exists in the vector synthesis direction. Similarly, the first return thin wire portion 14 and the second return thin wire portion 15 having the other end portion 14b and the other end portion 15b overlapping each other are considered to be vectors starting from the other end portion 14b and the other end portion 15b. The first return thin wire portions 14 and the second return thin wire portions 15 are provided so that the center point of the substrate opening 4 exists in the vector synthesis direction. Accordingly, each first advance thin wire portion 19, each second advance thin wire portion 21, each first return thin wire portion 14, and each second return thin wire portion 15 are not arranged toward the center point of the substrate opening 4.
[0025]
Further, the winding advance coil portion 6 penetrates all of the core substrate portion 8, the first overlapping substrate portion 12 and the second overlapping substrate portion 13 in the thickness direction, and the one end portion 19a of the first advance thin wire portion 19 and the second advancement portion. The inner diameter side advanced connecting thin wire portion 22 which is the inner diameter side connecting thin wire portion for electrically connecting the one end portion 21a of the thin wire portion 21 and the core substrate portion 8, the first overlapping substrate portion 12, and the second overlapping substrate portion 13 are thickened. It has an outer diameter side advanced connecting thin wire portion 23 that penetrates all in the direction and electrically connects the other end portion 19b of the first advanced fine wire portion 19 and the other end portion 21b of the second advanced fine wire portion 21. The inner diameter side advance connecting thin wire portion 22 connects one end portion 19 a of the first advance thin wire portion 19 and the one end portion 21 a of the second advance thin wire portion 21 that overlap in FIG. 4. The outer diameter side advance connecting thin wire portion 23 connects the other end portion 19b and the other end portion 21b that overlap in FIG. Therefore, as shown in FIG. 3, when viewed along the outer periphery of the substrate opening 4, the inner diameter side return connection thin wire portion 16 is between the inner diameter side advance connection thin wire portion 22 and the outer diameter side advance connection thin wire portion 23. The outer diameter side advanced connecting thin wire portion 23 is disposed between the inner diameter side return connecting thin wire portion 16 and the outer diameter side return connecting thin wire portion 17. In addition, the inner diameter side connection overlapping thin wire portion 22 and the outer diameter side connection overlapping thin wire portion 23 are formed of metal in through-holes penetrating all in the thickness direction of the core substrate portion 8, the first overlapping substrate portion 12, and the second overlapping substrate portion 13. It is formed by plating.
[0026]
In addition, the other end portions of the rewinding coil portion 5 and the winding advance coil portion 6 whose one end portions are connected to each other at the connection point 7 become the lead portions 25 and 26 of the coil wire 3 and are attached to the insulating substrate 2. The signal processing circuit 27 is electrically connected.
[0027]
The air-core coil 1 is manufactured as follows. First, the first return thin wire portion 14 and the second return thin wire portion 15 of metal foil are formed on one surface 9 and the other surface 10 of the core substrate portion 8 having the substrate opening 4 and provided with a plurality of through holes by a drill or the like. It prints substantially radially so that both ends contact the through hole. And the rewinding coil part 5 is formed by metal-plating a through-hole. Next, the first overlapping substrate portion 12 and the second overlapping substrate portion 13 are attached to the one surface 9 and the other surface 10, respectively, and a through hole penetrating the substrate is formed at a predetermined position by a drill or the like. Thereafter, in the same manner as the basic coil portion 5, the first advancement thin wire portion 19 and the second advancement thin wire portion 21 are printed on the first overlap surface 18 and the second overlap surface 20, respectively, and the through-holes are metal-plated and wound up. Part 6 is formed. Note that the connection point 7 and the lead portions 25 and 26 are specially formed when printing or metal plating. Thereafter, a signal processing circuit is attached to the completed insulating substrate 2 and electrically connected to the lead portions 25 and 26.
[0028]
When the air-core coil 1 configured as described above is used in a current sensor, it is usually used by passing a conductor through which a current flows through the substrate opening 4. When a current flows through the conductor, a magnetic field is generated around the axis of the conductor. Due to the change in the magnetic field, the induced electromotive force corresponding to the number of windings of the winding coil unit 6 and the winding coil unit 5 is generated. It occurs in each of the winding advance coil portions 5. Since each of the induced electromotive forces does not cancel each other and the winding advancement coil portion 6 and the rewinding coil portion 5 are wound in the same direction, both induction electromotive forces are added together to generate a large induced current. The induced current is measured by the signal processing circuit 27 through the line 3, and the current flowing through the conductor is calculated.
[0029]
In this air-core coil 1, the winding advance coil portion 6 is wound in the winding advance direction along the outer peripheral direction of the substrate opening 4, and the rewind coil portion 5 is wound forward and is in the direction opposite to the winding advance direction of the coil portion 6. Therefore, the air-core coil 1 has an effect of canceling the induced electromotive force generated by the external electromagnetic field generated in the coil wire 3. Also, the respective positions and areas of the region surrounded by the conducting wire of the rewinding coil unit 5 and the region surrounded by the conducting wire of the rewinding coil unit 6 shown in FIG. Since it can be easily changed by moving the arrangement position of the return connection thin wire portion 17, the inner diameter side advance connection thin wire portion 22 and the outer diameter side advance connection thin wire portion 23, the respective regions overlap to enlarge the common portion, and By matching the areas, the measurement error due to the external electromagnetic field can be further reduced.
[0030]
Further, the rewinding coil unit 5 and the rewinding coil unit 6 have a first return thin wire portion 14, a second return thin wire portion 15, a first advancement thin wire portion 19 and a second advancement thin wire portion 21 formed on different surfaces, respectively. Therefore, each first return fine wire portion 14, each second return fine wire portion 15, each first advance fine wire portion 19 and each second advance fine wire portion 21 can be arranged as densely as possible on each surface, and the coil wire The winding density of 3 can be increased. From this, the measurement sensitivity of the current sensor using the air-core coil 1 can be further improved.
Further, the air-core coil 1 generates a larger induced electromotive force than the air-core coil 100 of the conventional example because the induced electromotive forces of both the rewinding coil unit 6 and the winding-up coil unit 5 are added together. Measurement sensitivity as a current sensor is further improved.
[0031]
In the air-core coil 1, the winding advance coil portion 6 and the rewinding coil portion 5 are formed together with the insulating substrate 2, and the winding advance coil portion 6 and the rewinding coil portion 5 are formed as the insulating substrate 2. Since it is used in an embedded state, the winding interval between the winding advance coil unit 6 and the rewinding coil unit 5 can be kept constant, and the winding coil unit 6 and the rewinding coil unit 5 are bonded together. Therefore, the operation is facilitated, and a current sensor having a small measurement error with a constant winding interval of the coil wire 3 can be manufactured.
[0032]
The air-core coil 1 has a configuration in which the coil wire 3 has two coil parts, a rewinding coil part 5 and a winding advance coil part 6, but the number of coil parts is limited to two. There is no need to do this, and there may be three or more. In this case, all of the plurality of coil portions are electrically connected in series, and are wound so that the directions of induced electromotive forces generated in the coil portions by the current flowing through the conductors are electrically the same. Further, the overlapping substrate portion 11 is overlapped in order from the one surface 9 and the other surface 10 of the core substrate portion 8 by one less than the number of the plurality of coil portions, and the first thin wire portion or the second wire portion of each coil portion is stacked on each surface. Two fine wire portions are formed.
[0033]
In the above-described embodiment, the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17 of the rewinding coil portion 5 are respectively connected to the inner diameter side advance connection thin wire portion 22 and the outer diameter of the winding advance coil portion 6. Although it is arranged at a position farther from the substrate opening 4 than the side advance connecting thin wire portion 23, it is not necessary to be limited to such an arrangement position, and each inner diameter side advance connecting thin wire portion of the winding advance coil portion 6 is not necessary. 22 and the outer diameter side advanced connection thin wire portion 23 may be disposed at a position closer to the substrate opening 4. Even in this case, the area surrounded by the conducting wire of the rewinding coil portion 5 and the region surrounded by the conducting wire of the winding advance coil portion 6 in FIG. You can also.
Furthermore, for the same reason, between the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17 of the rewinding coil portion 5, the inner diameter side advance connection thin wire portion 22 and the outer diameter of the winding advance coil portion 6. You may make it arrange | position the side advance connection thin wire | line part 23. FIG.
[0034]
Further, in the above embodiment, the signal processing circuit 27 is provided on the insulating substrate 2 in order to improve the usability, but it goes without saying that the signal processing circuit 27 may be provided separately.
[0035]
Embodiment 2. FIG.
FIG. 5 is a schematic front view when viewed in the thickness direction of the insulating substrate, showing the configuration of the air-core coil according to Embodiment 2 of the present invention. In FIG. 5, the air-core coil 31 according to the second embodiment includes a coil wire 32. The air-core coil 31 has a configuration in which the coil wire 3 of the air-core coil 1 of the first embodiment is replaced with a coil wire 32, and the other configuration other than the coil 32 is the same as that of the first embodiment.
[0036]
The coil wire 32 has a rewinding coil portion 33 and a winding advance coil portion 34 which are a plurality of (for example, two) coil portions formed by winding a conductive wire along the outer periphery of the substrate opening 4. Yes. The rewinding coil unit 33 and the rewinding coil unit 34 have the same configurations as the rewinding coil unit 5 and the rewinding coil unit 6 of the first embodiment, respectively, but the formation points of the respective components are different. Yes.
[0037]
That is, FIG. 6 is a schematic view of the coil wire 32 as viewed along the winding direction. In FIG. 6, the rewinding coil unit 33 includes a plurality of first return thin wire portions 14 and a plurality of second return thin wire portions 15, and each first return thin wire portion 14 and each second return thin wire portion 15 are electrically connected. Have an inner diameter side return connection thin wire portion 16 and an outer diameter side return connection thin wire portion 17 connected in series. The first return thin wire portion 14 is formed on one surface 9 of the core substrate portion 8, and the second return thin wire portion 15 is formed on the second overlap surface 20 of the second overlap substrate portion 13. Further, the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17 are formed through the core substrate portion 8 and the second overlapping substrate portion 13.
[0038]
The winding advance coil section 34 has a plurality of first advance thin wire sections 19 and a plurality of second advance thin wire sections 21, and the first advance thin wire sections 19 and the second advance thin wire sections 21 are electrically connected in series. The inner diameter side advanced connecting thin wire portion 22 and the outer diameter side advanced connecting thin wire portion 23 are provided. The first advanced thin wire portion 19 is formed on the first overlapping surface 18 of the first overlapping substrate portion 12, and the second advanced thin wire portion 21 is formed on the other surface 10 of the core substrate portion 8. Further, the inner diameter side advanced connecting thin wire portion 22 and the outer diameter side advanced connecting thin wire portion 23 are formed through the first overlapping substrate portion 12 and the core substrate portion 8.
Further, when the coil wire 32 is viewed along the winding direction, the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17 of the rewinding coil portion 33 are advanced on the inner diameter side of the winding advance coil portion 34. It arrange | positions between the connection thin wire | line part 22 and the outer diameter side advance connection thin wire | line part 23. FIG.
[0039]
Therefore, the air-core coil 31 having such a configuration adjusts the thickness of the first overlapping substrate portion 12 or the second overlapping substrate portion 13, or the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17. By moving the inner diameter side advanced connecting thin wire portion 22 or the outer diameter side advanced connecting thin wire portion 23 in the radial direction of the air core coil 31, the same effects as in the first embodiment can be obtained and the radial direction of the air core coil 31 can be achieved. Therefore, even if the mounting space is limited in the radial direction of the conductor as in the case where the conductor whose current is to be measured is arranged adjacently, the air-core coil 31 is Each of the adjacent conductors can be attached and measurement is possible.
[0040]
Similar to the first embodiment, the number of coil portions of the coil wire 32 is not limited to two, and may be three or more. In this case, the number of overlapping substrate portions, which is one less than the number of coil portions, is superimposed on the one surface 9 and the other surface 10 on the core substrate portion 8.
[0041]
Further, as shown in FIG. 7, the outer diameter side return connecting thin wire portion 17 of the rewinding coil portion 33 as viewed along the winding direction of the coil wire 32 is wound and the outer diameter side advanced connecting thin wire of the coil portion 34 is wound. It may be arranged outside the portion 23 as viewed from the substrate opening 4. That is, the inner diameter side return connection thin wire portion 16 is arranged between the inner diameter side advance connection thin wire portion 22 and the outer diameter side advance connection thin wire portion 23, and the inner diameter side return connection thin wire portion 16 and the outer diameter side return connection thin wire portion 17. The outer diameter side advanced connecting thin wire portion 23 may be disposed between the two. In this way, the radial and thickness dimensions of the air-core coil 31 can be adjusted at a time.
[0042]
Embodiment 3 FIG.
FIG. 8 is a schematic diagram when an air-core coil according to Embodiment 3 of the present invention is viewed along the winding direction of the coil wire. In FIG. 8, the air-core coil 41 includes an insulating substrate 42 having a substrate opening 4, and a coil wire 43 provided on the insulating substrate 42 and wound around the outer periphery of the substrate opening 4. Yes.
[0043]
The insulating substrate 42 has a core substrate portion 44 and a stacked substrate portion 11. The stacked substrate unit 11 is the same as that of the first embodiment, and includes a first stacked substrate unit 12 stacked on one surface 9 of the core substrate unit 44 and a second stacked substrate unit 13 stacked on the other surface 10. Has been. The core substrate portion 44 includes a one-surface-side core substrate dividing portion 45 having one surface 9 and an other-surface-side core substrate dividing portion 46 having the other surface 10. The one-surface-side core substrate dividing portion 45 and the other-surface-side core substrate dividing portion 46 have a one-surface-side facing surface 47 and an other-surface-side facing surface 48 that are provided to face each other.
[0044]
The coil wire 43 has a rewinding coil portion 49 and a winding advance coil portion 50 formed by winding a conductive wire along the outer periphery of the substrate opening 4. The rewinding coil unit 49 and the winding-up coil unit 50 are electrically connected in series, and are wound so that the induced electromotive force due to the measured current is in the same electrical direction.
[0045]
The rewinding coil portion 49 has a plurality of first return thin wire portions 14 formed on one surface 9 and a plurality of second return thin wire portions 15 formed on the other surface 10 as in the first embodiment. Yes. In addition, the rewinding coil portion 49 includes an inner diameter side return connection thin wire portion 51 and an outer diameter side return connection thin wire portion 52 that electrically connect the first return thin wire portion 14 and the second return thin wire portion 15 in series. ing.
[0046]
The inner diameter side return connection thin wire portion 51 includes a one-surface-side return connection division portion 53 that is a one-surface-side connection division portion that penetrates the one-surface-side core substrate division portion 45 and an other-surface-side connection that penetrates the other-surface-side core substrate division portion 46. It has the other surface side return connection division part 54 which is a division part. The one-surface-side return connection dividing portion 53 has one-surface-side conductor land 55 that is, for example, a conductive land of conductive paste exposed on the one-surface-side facing surface 47, and the other-surface-side return connection-dividing portion 54 is the other-surface-side facing surface. For example, a conductive land 56 on the other surface side which is a conductive land of conductive paste exposed at 48 is provided. The one-surface-side conductor land 55 and the other-surface-side conductor land 56 are in pressure contact with each other and are electrically connected to form an inner diameter-side return connection thin wire portion 51.
[0047]
Similarly, the outer diameter side return connection thin wire portion 52 has one surface side connection division portion 57 that is one surface side connection division portion that penetrates the one surface side core substrate division portion 45, and the other surface side through the other surface side core substrate division portion 46. It has the other surface side return connection division part 58 which is a surface side connection division part. The one-surface-side return connection dividing portion 57 has a one-surface-side conductor land 59 that is, for example, a conductive land of conductive paste exposed on the one-surface-side facing surface 47, and the other-surface-side return connection-dividing portion 58 is the other-surface-side facing surface. The other surface side conductor land 60 which is a conductor land of, for example, a conductive paste exposed at 48 is provided. The one-surface-side conductor land 59 and the other-surface-side conductor land 60 are in pressure contact with each other to be electrically connected to form an outer diameter side return connection thin wire portion 52.
[0048]
Similarly to the winding advance coil portion 6 of the first embodiment, the winding advance coil portion 50 also includes a plurality of first advance thin wire portions 19 formed on the first overlapping surface 18 and a plurality of winding formed on the second overlapping surface 20. The second advanced thin wire portion 21 is provided. Further, the winding advance coil portion 50 has an inner diameter side advance connection thin wire portion 61 and an outer diameter side advance connection thin wire portion 62 that electrically connect the first advancement fine wire portion 19 and the second advancement fine wire portion 21 in series. ing.
[0049]
The inner diameter side advance connecting thin wire portion 61 is a one surface side advanced connection dividing portion 63 which is a one surface side connection dividing portion penetrating the one surface side core substrate dividing portion 45, and the other surface side connection passing through the other surface side core substrate dividing portion 46. It has the other surface side advance connection division | segmentation part 64 which is a division part. The one-surface-side advanced connection dividing portion 63 has one-surface-side conductor land 65 that is a conductor land of, for example, a conductive paste exposed on the one-surface-side facing surface 47, and the other-surface-side advanced connection-dividing portion 64 is the other-surface-side facing surface. For example, a conductive land 66 on the other surface side which is a conductive land of a conductive paste exposed at 48 is provided. The one-surface-side conductor land 65 and the other-surface-side conductor land 66 are brought into pressure contact and are electrically connected to form an inner diameter-side return connection thin wire portion 61.
[0050]
Similarly, the outer diameter side advanced connection thin wire portion 62 also includes a first surface side advance connection division portion 67 that is a first surface side connection division portion that penetrates the first surface side core substrate division portion 45, and the other surface side core substrate division portion 46. It has the other surface side advance connection division | segmentation part 68 which is a surface side connection division | segmentation part. The one-surface-side advance connection dividing portion 67 has a one-surface-side conductor land 69 that is, for example, a conductive land of conductive paste exposed on the one-surface-side facing surface 47, and the other-surface-side advance connection-dividing portion 68 is the other-surface-side facing surface. The other side conductor land 70 which is a conductor land of, for example, a conductive paste exposed at 48 is provided. The one-surface-side conductor land 69 and the other-surface-side conductor land 70 are brought into pressure contact with each other to be electrically connected to form an outer diameter side advanced connecting thin wire portion 62.
Other configurations are the same as those in the first embodiment.
[0051]
Here, generally, as described above, an air-core coil passes through a conductor to be measured in the center, and a magnetic flux generated by a current flowing through the conductor is chained to a coil wire wound around the axis of the conductor. The induced electromotive force is generated in the coil wire, and the current flowing through the conductor is measured. Therefore, the greater the magnetic flux linked to the coil wire, the greater the induced electromotive force generated in the coil wire. The amount of magnetic flux that interlinks increases as the area of the region surrounded by the conductive wire of the coil wire as viewed along the winding direction increases. In general, a plurality of conductors to be measured are often arranged adjacent to each other in parallel, so that the air-core coil is likely to be constrained by a radial distance rather than an axial direction of the conductor when being mounted on the conductor. . For this reason, in order to increase the area of the region surrounded by the conductive wire, the shape of the region may be formed elongated along the axial direction of the conductor.
[0052]
The coil wire formed on the insulating substrate forms a conductive wire along the axial direction by forming a through hole in the insulating substrate with a drill or the like and performing metal plating. However, when the distance between the through holes is increased, the drill is likely to be broken, so that the diameter of the drill is increased, and the diameter of the through hole is increased accordingly. As the diameter of the through-hole increases, the volume of the coil wire formed on the insulating substrate increases and the number of turns of the coil wire decreases.
[0053]
In the air-core coil 41 according to this embodiment, the inner diameter side return connection thin wire portion 51, the outer diameter side return connection thin wire portion 52, the inner diameter side advance connection thin wire portion 61, and the outer diameter side advance connection thin wire portion 62 are respectively on one surface side. Return connection thin wire portions 53 and 57, one surface side advance connection thin wire portions 63 and 67, and other surface side return connection thin wire portions 54 and 58, other surface side advance connection thin wire portions 64 and 68 are provided on one surface side facing surface 47 and the other surface. Since it is formed by being electrically connected between the side facing surfaces 48, the inner diameter side return connection thin wire portion 51, the outer diameter side return connection thin wire portion 52, the inner diameter side advance connection thin wire portion 61 and the outer It is no longer necessary to form a through hole having the length of the diameter-side advanced connection thin wire portion 62, and the one-surface-side return connection thin-wire portions 53, 57, the one-surface-side advance connection thin-wire portions 63, 67, and the other-surface-side return connection thin-wire portions 54, 58. , And other side advance connecting thin wire portions 64, 68 The through-holes respectively so that it is possible to form individually. The lengths of the one-surface-side return connection thin wire portions 53, 57, the one-surface-side advance connection thin-wire portions 63, 67, the other-surface-side return connection thin-wire portions 54, 58, and the other-surface-side advance connection thin-wire portions 64, 68 Since it is shorter than the length of the connecting thin wire portion 51, the outer diameter side return connecting thin wire portion 52, the inner diameter side advance connecting thin wire portion 61 and the outer diameter side advance connecting thin wire portion 62, a through hole can be formed with such a thin drill, and the number of turns can be reduced. I can do more.
[0054]
Also, the inner diameter side return connection thin wire portion 51, the outer diameter side return connection thin wire portion 52, the inner diameter side advance connection thin wire portion 61 and the outer diameter side advance connection thin wire portion 62 are respectively one surface side return connection thin wire portions 53 and 57, one surface side. The lead connecting thin wire portions 63 and 67, the other surface side return connecting thin wire portions 54 and 58, and the other face side leading connecting thin wire portions 64 and 68 are electrically connected and become longer as a whole. The area of the region surrounded by the conductive wire of the coil wire in FIG. 8 can be increased regardless of the radial distance restriction.
[0055]
8 is the same as the arrangement relationship between the rewinding coil unit 33 and the rewinding coil unit 34 in the second embodiment. In addition, if the connecting thin wire portion of each coil portion passes through the core substrate portion 44, for example, the winding advance coil portion is wound around the rewinding coil portion. It doesn't matter.
[0056]
As in the first embodiment, the number of coil portions of the coil wire 43 is not limited to two, and may be three or more. In this case, on the core substrate portion 44, the number of overlapping substrate portions, which is one less than the number of coil portions, is superimposed on the one surface 9 and the other surface 10, respectively.
[0057]
In each of the above embodiments, the conductor to be measured penetrates the substrate opening of the air-core coil, but the conductor 80 is wound around the outer periphery of the substrate opening. If the coil wire is wound while encircling the coil wire, the amount of magnetic flux linked to the coil wire is increased, so that the measurement sensitivity is improved accordingly. In this case, as shown in FIG. 9, the conductor may be formed by being formed on the surface of an air-core coil coated with an insulator such as an epoxy resin by copper plating, for example. By doing so, the positional relationship between the conductor 80 and the coil wire becomes constant, and the amount of magnetic flux linked to the coil wire can be further stabilized.
[0058]
In each of the above embodiments, the air-core coil is formed in an annular shape by the insulating substrate and the coil wire, but a part of the air-core coil may be separable. That is, as shown in FIG. 10, the annular air-core coil is separated into a main divided portion 81 that is a substantially C-shaped divided portion and a divided portion that is detachably attached to both ends of the main divided portion 81. It is comprised from the division part 82, and the main division part 81 and the separation | segmentation division part 82 may form an annular shape as a whole. With such a configuration, when the conductor to be measured passes through the opening of the substrate of the air-core coil, the separating and dividing portion 82 is separated from the main dividing portion 82 without having to bother inserting the conductor from the end of the conductor into the opening. Since the conductor can be inserted from the separated space, the air-core coil can be easily mounted even when it is difficult to cut the conductor such as an existing conductor.
[0059]
In order to connect the main division unit 81 and the separation division unit 82, the configuration of the main division unit 81 and the separation division unit 82 may be as follows, for example. That is, FIG. 11 is a partial perspective view schematically showing respective end portions in a state where the main division portion 81 and the separation division portion 82 are separated from each other, and FIG. 12 is taken along an arrow 83 in FIG. It is a schematic diagram which shows the state of the through-hole which forms the connection thin wire | line part of a coil wire when it sees. 10 to 12, the end of the main dividing portion 81 is a stepped engagement portion 85 having a step surface 84, and the end of the separation dividing portion 82 is a stepped engagement having a step surface 86. Part 87 is formed. When the main division portion 81 and the separation division portion 82 are connected, the step surface 84 and the step surface 86 are arranged to face each other. The engaging portion 87 of the separation dividing portion 82 is provided with a pin 88 that is formed in the through hole and is a conductive connecting means protruding from the step surface 84. Further, a through hole 89 plated with metal is formed on the inner surface of the engaging portion 85 of the main divided portion 81, and when the main divided portion 81 and the separation divided portion 82 are connected, The protruding portion of the pin 88 is inserted. The pin 88 comes into contact with the metal plating formed on the inner surface of the through-hole 89 when inserted into the through-hole 89, and the connecting thin wire portion of the coil wire is formed by the metal plating on the inner surface of the pin 88 and the through-hole 89. It is configured. In this way, the main division portion 81 and the separation division portion 82 are connected mechanically as well as being electrically connected to the coil wires.
[0060]
The pin 88 may be provided in the engaging portion 85 of the main dividing portion 81. In this case, the engaging portion 86 of the separation dividing portion 82 is formed with a through hole 89 that is metal-plated on the inner surface. .
Further, the air-core coil need not be limited to being constituted by two divided parts, ie, the main divided part 81 and the separating divided part 82, and may be constituted by three or more divided parts.
[0061]
【The invention's effect】
  As is apparent from the above description, the air-core coil according to the present invention is an air-core coil used for measuring a current flowing through a conductor, and includes an insulating substrate having a substrate opening in the center, and the insulation Each of the coil portions when viewed along the winding direction, and having a plurality of coil portions formed by winding a conductive wire around an axis of the substrate opening. The coil portions are arranged so that the regions surrounded by the conductive wires partially overlap each other, and the induced electromotive forces generated in the coil portions by the current flowing through the conductors are electrically in the same direction. A coil wire formed by connecting coil portions in series, and the insulating substrate includes a core substrate portion through which the conductive wire of each coil portion penetrates, and one surface and the other surface of the core substrate portion, respectively.One step at a timeEach of the coil portions is arranged around the axis on either the overlapping surface on the side opposite to the core substrate portion or the one surface of the overlapping substrate portion that is overlapped on the one surface side. A plurality of first thin wire portions arranged in a substantially radial manner, an overlap surface on the side opposite to the core substrate portion of the overlap substrate portion overlaid on the other surface side, and the other surface substantially radially around the axis A plurality of second thin wire portions, an inner diameter side connecting thin wire portion that electrically connects one end portion of the first thin wire portion and one end portion of the second thin wire portion, and the other end of the first thin wire portion. And an outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion electrically connected to the inner diameter side connecting thin wire portion. Each of the first thin wire portions is arranged on a different surface for each of the coil portions, and each of the second thin wire portions is They are arranged in different planes for each serial coil unitWhen viewed along the winding direction, between the first thin wire portion and the second thin wire portion of one of the coil portions, the first thin wire portion or the second of the other coil portion. One of the thin line parts is arrangedTherefore, the coil wire having a constant pitch between the conductive wires can be easily formed, and the presence of the overlapping region makes it possible for an external electromagnetic field to pass through a common region of the coil portions. In addition, the area of each of the coil portions can be adjusted to be the same, and even if the external electromagnetic field varies from place to place, the induction cancels each other in accordance with the change. The effect of generating electromotive force is increased.Further, when viewed along the winding direction, the region of the one coil part and the region of the other coil part can be partly overlapped and easily arranged.
[0062]
  Also,An air-core coil used for measuring a current flowing through a conductor, and having an insulating substrate having a substrate opening in the center, and a conductor provided along the axis of the substrate opening provided on the insulating substrate The coil portions are arranged such that the regions surrounded by the conductive wires of the coil portions partially overlap each other when viewed along the winding direction. And a coil wire configured such that the coil portions are connected in series so that the induced electromotive forces generated in the coil portions by the current flowing through the conductor are in the same electrical direction, The insulating substrate includes a core substrate portion through which the conductive wire of each coil portion penetrates, and an overlapping substrate portion that is overlapped one by one from one surface and the other surface of the core substrate portion, and each coil portion Is heavy on the one side. A plurality of first thin wire portions arranged substantially radially around the axis on one of the overlapping surface on the opposite side of the core substrate portion side and the one surface of the overlapped substrate portion, and the other surface side. A plurality of second fine wire portions arranged substantially radially around the axis, one end portion of the first fine wire portion, and the first on the overlap surface on the side opposite to the core substrate portion side of the overlap substrate portion and the other surface The inner diameter side connecting thin wire portion electrically connecting one end portion of the two thin wire portions, and the first end portion electrically connected to the other end portion of the first thin wire portion and the inner diameter side connecting thin wire portion. It has an outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the two thin wire portions, and each of the first thin wire portions is arranged on a different surface for each of the coil portions. Each of the second thin wire portions is arranged on a different surface for each of the coil portions and viewed along the winding direction. In addition, between the inner diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion of one of the coil portions, either the inner diameter side connecting thin wire portion or the outer diameter side connecting thin wire portion of the other coil portion. Therefore, the coil wire having a constant pitch between the conductors can be easily formed, and the regions overlapping each other exist so that an external electromagnetic field passes through a common region of the coil portions. The area of each of the coil portions can be adjusted to be the same, and even if the external electromagnetic field varies from place to place, each coil corresponds to the change. The effect of generating the induced electromotive forces that cancel each other out at the portion is increased. Further, when viewed along the winding direction, the region of the one coil part and the region of the other coil part can be partly overlapped and easily arranged.
[0063]
  Also,An air-core coil used for measuring a current flowing through a conductor, and having an insulating substrate having a substrate opening in the center, and a conductor provided along the axis of the substrate opening provided on the insulating substrate The coil portions are arranged such that the regions surrounded by the conductive wires of the coil portions partially overlap each other when viewed along the winding direction. And each coil portion is connected in series so that the induced electromotive forces generated by the current flowing through the conductor are in the same electrical direction, and the insulating substrate comprises: And a core substrate portion through which the conducting wire of each coil portion penetrates, and an overlapping substrate portion that is stacked in the same number from one surface and the other surface of the core substrate portion, and the core substrate portion has the one surface. Single-sided core substrate division And the other surface side core substrate dividing portion having the other surface, and each coil portion is overlapped on the one surface side of the overlapping substrate portion on the side opposite to the core substrate portion side and the one surface Any one of the plurality of first thin wire portions arranged substantially radially around the axis, the overlapping surface on the side opposite to the core substrate portion of the overlapping substrate portion stacked on the other surface side, and the other surface A plurality of second thin wire portions arranged substantially radially around the axis, an inner diameter side connecting thin wire portion for electrically connecting one end portion of the first thin wire portion and one end portion of the second thin wire portion, In addition, the other end portion of the first thin wire portion and the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion electrically connected to the inner diameter side connecting thin wire portion are electrically connected. The outer diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion are connected to the outer diameter side connecting thin wire portion. Each of the one-side-side core substrate dividing portion and the other-side-side core substrate portion is divided into a one-surface-side connection dividing portion and an other-surface-side connection dividing portion, and the one-surface-side connection dividing portion and the other-surface-side connection The division part has conductor lands that are electrically connected to each other between the one-surface-side connection division part and the other-surface-side connection division part, and each of the first thin wire parts is different for each coil part. Since each of the second thin wire portions is arranged on a different surface for each of the coil portions, the inner diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion can be divided and manufactured. By increasing the length of the inner diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion, it is possible to increase the area of the region surrounded by the conducting wire when viewed along the axis.
[0067]
Further, when viewed along the winding direction, the conductor is wound at least once around the coil wire via an insulator, so that the conductor when viewed along the winding direction is More magnetic flux generated by the current flowing through the conductor passes through a region surrounded by the conducting wire of the coil wire, and the induced electromotive force flowing through the coil wire is increased to improve measurement sensitivity.
[0068]
In addition, the air-core coil is composed of a plurality of divided portions divided along the radial direction of the substrate opening, and each of the divided portions can be attached to and detached from each other when being combined. Since it has connection means for electrical and mechanical connection, when passing the conductor through the substrate opening, the air core coil is divided into the divided parts without the need to cut the conductor. The conductor can be easily passed through the substrate opening.
[Brief description of the drawings]
FIG. 1 is a partial perspective view showing a configuration of an air-core coil according to Embodiment 1 of the present invention.
FIG. 2 is a partially enlarged view showing a configuration of a coil wire.
3 is a schematic diagram when the air-core coil of FIG. 2 is viewed along the winding direction of the coil wire.
FIG. 4 is a schematic front view of an air-core coil when viewed in the thickness direction of an insulating substrate.
FIG. 5 is a schematic front view showing the configuration of an air-core coil according to Embodiment 2 of the present invention when viewed in the thickness direction of an insulating substrate.
6 is a schematic diagram when the air-core coil of FIG. 5 is viewed along the winding direction of the coil wire.
FIG. 7 is a schematic view of an air core coil according to a modification of the second embodiment of the present invention as viewed along the winding direction of the coil wire.
FIG. 8 is a schematic diagram when an air-core coil according to Embodiment 3 of the present invention is viewed along the winding direction of the coil wire.
FIG. 9 is a front view showing a state where a conductor is wound around an air-core coil.
FIG. 10 is a front view of an air-core coil configured by a dividing unit.
FIG. 11 is a partial perspective view schematically showing respective end portions in a state in which a main division portion and a separation division portion are separated from each other.
12 is a schematic diagram showing a state of a through hole forming a connection thin wire portion of a coil wire when viewed along an arrow 83 in FIG. 11. FIG.
FIG. 13 is a schematic perspective view showing a configuration of a conventional air-core coil.
[Explanation of symbols]
1, 31, 41 Air-core coil, 2, 42 Insulating substrate, 3, 32, 43 Coil wire, 4 Substrate opening, 5, 33, 49 Rewinding coil portion (coil portion), 6, 34, 50 Winding advance Coil portion (coil portion), 8, 44 core substrate portion, 9 one surface, 10 other surface, 11 overlap substrate portion (12 first overlap substrate portion, 13 second overlap substrate portion), 14 first return thin wire portion (first Thin wire portion), 15 Second return thin wire portion (second thin wire portion), 16, 51 Inner diameter side return connection thin wire portion (inner diameter side connection thin wire portion), 17, 52 Outer diameter side return connection thin wire portion (outer diameter side connection thin wire portion) Part), 18 1st overlap surface (overlapping surface), 19 1st advance thin wire | line part (1st thin wire part), 20 2nd overlap surface (overlapping surface), 21 2nd advance thin wire | line part (2nd thin wire part), 22 , 61 Inner diameter side advanced connection thin wire part (Inner diameter side connection thin wire part), 23,62 Outer diameter side advanced connection thin wire part (Outer diameter side connecting thin wire portion), 45 one-surface side core substrate dividing portion, 46 other-surface side core substrate dividing portion, 53, 57 one-surface-side return connection dividing portion (one-surface-side connection dividing portion), 54, 58 other-surface-side return Connection division part (other side connection division part), 55, 59 One side conductor land (conductor land), 56, 60 Other side conductor land (conductor land), 63, 67 One side advance connection division part (one side connection) Divided portion), 64, 68 Other surface side advanced connection divided portion (other surface side connection divided portion), 65, 69 One surface side conductor land (conductor land), 66, 70 Other surface side conductor land (conductor land), 81 Main Dividing unit (dividing unit), 82 Separating dividing unit (dividing unit).

Claims (7)

導体に流れる電流を測定するために用いられる空芯コイルであって、
中央に基板開口部を有した絶縁性基板と、
前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により各前記コイル部に発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、
前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ１段ずつ重ねられた重ね基板部とを有し、
各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有しており、
各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列され、
前記巻回方向に沿って視たときに、一方の前記コイル部の前記第１細線部と前記第２細線部との間に、他方の前記コイル部の前記第１細線部あるいは前記第２細線部のいずれかが配置されていることを特徴とする空芯コイル。An air-core coil used to measure the current flowing through a conductor,
An insulating substrate having a substrate opening in the center;
Each of the coil portions when provided along the winding direction has a plurality of coil portions provided on the insulating substrate and configured by winding a conductive wire around the axis of the substrate opening. The coil portions are arranged so that the regions surrounded by the conductive wires partially overlap each other, and the induced electromotive forces generated in the coil portions by the current flowing through the conductor are electrically in the same direction. A coil wire configured by connecting the coil portions in series,
The insulating substrate has a core substrate portion through which the conductive wire of each of the coil portions penetrates, and a stacked substrate portion that is stacked one by one from one surface and the other surface of the core substrate portion,
Each of the coil portions includes a plurality of first thin wires arranged substantially radially around the axis on either the overlapping surface on the side opposite to the core substrate portion or the one surface of the overlapping substrate portion that is overlapped on the one surface side. A plurality of second thin wire portions arranged substantially radially around the axis on any one of the overlapping surface on the side opposite to the core substrate portion and the other surface of the overlapping substrate portion stacked on the other surface side, An inner diameter side connecting thin wire portion that electrically connects one end portion of the first thin wire portion and one end portion of the second thin wire portion, and an other end portion of the first thin wire portion and the inner diameter side connecting thin wire portion are electrically connected An outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion connected to
Each of the first thin wire portions is arranged on a different surface for each of the coil portions, and each of the second thin wire portions is arranged on a different surface of each of the coil portions,
When viewed along the winding direction, the first thin wire portion or the second thin wire of the other coil portion is between the first thin wire portion and the second thin wire portion of one of the coil portions. Any one of the parts is disposed . 導体に流れる電流を測定するために用いられる空芯コイルであって、
中央に基板開口部を有した絶縁性基板と、
前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により各前記コイル部に発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、
前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ１段ずつ重ねられた重ね基板部とを有し、
各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有しており、
各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列され、
前記巻回方向に沿って視たときに、一方の前記コイル部の前記内径側接続細線部と前記外径側接続細線部との間に、他方の前記コイル部の前記内径側接続細線部あるいは前記外径側接続細線部のいずれかが配置されていることを特徴とする空芯コイル。An air-core coil used to measure the current flowing through a conductor,
An insulating substrate having a substrate opening in the center;
Each of the coil portions when provided along the winding direction has a plurality of coil portions provided on the insulating substrate and configured by winding a conductive wire around the axis of the substrate opening. The coil portions are arranged so that the regions surrounded by the conductive wires partially overlap each other, and the induced electromotive forces generated in the coil portions by the current flowing through the conductor are electrically in the same direction. A coil wire configured by connecting the coil portions in series,
The insulating substrate has a core substrate portion through which the conductive wire of each of the coil portions penetrates, and a stacked substrate portion that is stacked one by one from one surface and the other surface of the core substrate portion,
Each of the coil portions includes a plurality of first thin wires arranged substantially radially around the axis on either the overlapping surface on the side opposite to the core substrate portion or the one surface of the overlapping substrate portion that is overlapped on the one surface side. A plurality of second thin wire portions arranged substantially radially around the axis on any one of the overlapping surface on the side opposite to the core substrate portion and the other surface of the overlapping substrate portion stacked on the other surface side, An inner diameter side connecting thin wire portion that electrically connects one end portion of the first thin wire portion and one end portion of the second thin wire portion, and an other end portion of the first thin wire portion and the inner diameter side connecting thin wire portion are electrically connected An outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion connected to
Each of the first thin wire portions is arranged on a different surface for each of the coil portions, and each of the second thin wire portions is arranged on a different surface of each of the coil portions,
When viewed along the winding direction, between the inner diameter side connection thin wire portion and the outer diameter side connection thin wire portion of one of the coil portions, the inner diameter side connection thin wire portion of the other coil portion or Any one of the outer diameter side connecting thin wire portions is disposed . 導体に流れる電流を測定するために用いられる空芯コイルであって、
中央に基板開口部を有した絶縁性基板と、
前記絶縁性基板に設けられ、前記基板開口部の軸線周りに沿って導線が巻回されて構成された複数のコイル部を有し、前記巻回方向に沿って視たときの各前記コイル部の前記導線によって囲まれる領域が互いに一部重なり合って各前記コイル部が配置されているとともに、前記導体を流れる電流により発生する誘導起電力が電気的に同じ向きになるように各前記コイル部が直列に接続されて構成されたコイル線とを備え、
前記絶縁性基板は、各前記コイル部の前記導線が貫通した芯基板部と、前記芯基板部の一面及び他面からそれぞれ同数段重ねられた重ね基板部とを有し、前記芯基板部は、前記一面を有する一面側芯基板分割部と、前記他面を有する他面側芯基板分割部とから構成されており、
各前記コイル部は、前記一面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記一面の何れかに、前記軸線周りに略放射状に配列された複数の第１細線部、前記他面側に重ねられた前記重ね基板部の反前記芯基板部側の重ね面及び前記他面の何れかに、前記軸線周りに略放射状に配列された複数の第２細線部、前記第１細線部の一端部と前記第２細線部の一端部とを電気的に接続する内径側接続細線部、並びに前記第１細線部の他端部と前記内径側接続細線部に電気的に接続された前記一端部を有する前記第２細線部に隣接する前記第２細線部の他端部とを電気的に接続する外径側接続細線部を有し、
前記内径側接続細線部及び前記外径側接続細線部は、それぞれ前記一面側芯基板分割部及び前記他面側芯基板部の間で一面側接続分割部及び他面側接続分割部に分割されており、前記一面側接続分割部及び前記他面側接続分割部は、互いに電気的に接続する導体ランドを前記一面側接続分割部と前記他面側接続分割部との間にそれぞれ有しており、
各前記第１細線部は前記コイル部ごとに異なる面に配列され、各前記第２細線部は前記コイル部ごとに異なる面に配列されていることを特徴とする空芯コイル。An air-core coil used to measure the current flowing through a conductor,
An insulating substrate having a substrate opening in the center;
Each of the coil portions when provided along the winding direction has a plurality of coil portions provided on the insulating substrate and configured by winding a conductive wire around the axis of the substrate opening. The coil portions are arranged so that the regions surrounded by the conductive wires partially overlap each other, and the coil portions are arranged so that the induced electromotive forces generated by the current flowing through the conductor are in the same electrical direction. A coil wire configured to be connected in series,
The insulating substrate includes a core substrate portion through which the conductive wire of each coil portion penetrates, and an overlapping substrate portion that is overlapped by the same number from one surface and the other surface of the core substrate portion, The one-surface-side core substrate dividing portion having the one surface and the other-surface-side core substrate dividing portion having the other surface,
Each of the coil portions includes a plurality of first thin wires arranged substantially radially around the axis on either the overlapping surface on the side opposite to the core substrate portion or the one surface of the overlapping substrate portion that is overlapped on the one surface side. A plurality of second thin wire portions arranged substantially radially around the axis on any one of the overlapping surface on the side opposite to the core substrate portion and the other surface of the overlapping substrate portion stacked on the other surface side, An inner diameter side connecting thin wire portion that electrically connects one end portion of the first thin wire portion and one end portion of the second thin wire portion, and an other end portion of the first thin wire portion and the inner diameter side connecting thin wire portion are electrically connected An outer diameter side connecting thin wire portion that electrically connects the other end portion of the second thin wire portion adjacent to the second thin wire portion having the one end portion connected to
The inner diameter side connecting thin wire portion and the outer diameter side connecting thin wire portion are respectively divided into a one surface side connection dividing portion and an other surface side connection dividing portion between the one surface side core substrate dividing portion and the other surface side core substrate dividing portion. The one-surface-side connection division portion and the other-surface-side connection division portion each have a conductor land electrically connected to each other between the one-surface-side connection division portion and the other-surface-side connection division portion. And
Each said 1st thin wire | line part is arranged on a different surface for every said coil part, Each said 2nd fine wire part is arranged on a different surface for every said coil part, The air-core coil characterized by the above-mentioned. 前記重ね基板部は、前記一面及び前記他面にそれぞれ１段ずつ重ねられ、
前記巻回方向に沿って視たときに、一方の前記コイル部の前記第１細線部と前記第２細線部との間に、他方の前記コイル部の前記第１細線部あるいは前記第２細線部のいずれかが配置されていることを特徴とする請求項３に記載の空芯コイル。The stacked substrate portion is stacked one step on each of the one surface and the other surface,
When viewed along the winding direction, the first thin wire portion or the second thin wire of the other coil portion is between the first thin wire portion and the second thin wire portion of one of the coil portions. The air core coil according to claim 3 , wherein any one of the portions is arranged. 前記重ね基板部は、前記一面及び前記他面にそれぞれ１段ずつ重ねられ、
前記巻回方向に沿って視たときに、一方の前記コイル部の前記内径側接続細線部と前記外径側接続細線部との間に、他方の前記コイル部の前記内径側接続細線部あるいは前記外径側接続細線部のいずれかが配置されていることを特徴とする請求項３又は請求項４に記載の空芯コイル。The stacked substrate portion is stacked one step on each of the one surface and the other surface,
When viewed along the winding direction, between the inner diameter side connection thin wire portion and the outer diameter side connection thin wire portion of one of the coil portions, the inner diameter side connection thin wire portion of the other coil portion or 5. The air-core coil according to claim 3, wherein any one of the outer diameter side connecting thin wire portions is disposed. 前記巻回方向に沿って視たときに、前記導体が前記コイル線を囲んで絶縁体を介して少なくとも１回巻回されていることを特徴とする請求項１乃至請求項５の何れかに記載の空芯コイル。When viewed along the winding direction, to any one of claims 1 to 5 wherein the conductor is characterized in that it is wound at least 1-turn via an insulator surrounding the coil wire The air-core coil as described. 前記基板開口部の径方向に沿って複数に分割された分割部から構成された空芯コイルであって、
各前記分割部は、前記組み合わせられる際にそれぞれの前記導線を互いに着脱可能に電気的及び機械的に接続する接続手段を有していることを特徴とする請求項１乃至請求項６の何れかに記載の空芯コイル。An air-core coil composed of a divided portion divided into a plurality along the radial direction of the substrate opening,
Each said division | segmentation part has the connection means which connects each said conducting wire detachably electrically and mechanically when the said combination is combined, The any one of Claim 1 thru | or 6 characterized by the above-mentioned. The air-core coil as described in 2.
JP2002168572A 2002-06-10 2002-06-10 Air core coil Expired - Fee Related JP4220727B2 (en)

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