JP2015011021A

JP2015011021A - Current sensor

Info

Publication number: JP2015011021A
Application number: JP2013139176A
Authority: JP
Inventors: 新一小荒田; Shinichi Koarata
Original assignee: Staf Corp Ltd
Current assignee: Staf Corp Ltd
Priority date: 2013-07-02
Filing date: 2013-07-02
Publication date: 2015-01-19

Abstract

PROBLEM TO BE SOLVED: To provide a current sensor having a structure that makes a relative position of the current sensor and a measurement conductor constant to decrease measurement error.SOLUTION: A current sensor 1 measures an electric current flowing through an electric wire 2 in a state where the electric wire 2 is inserted from an introduction port of a U-shaped space part 3 to the deepest and held at a predetermined position. An induction field generated in a coil is detected by the electric current flowing through the electric wire 2. The current sensor 1 includes: a detection unit 5 for detecting the induction field; and a pair of a first holding unit 6a and a second holding unit 6b vertically arranged for positioning the electric wire 2 to hold and fix it. Since the electric wire 2 is held by the pair of the first holding unit 6a and second holding unit 6b, the relative position of the electric wire 2 and the current sensor 1 is accurate.

Description

本発明は、電線に流れる電流を検出するための電流センサーに関する。特に、電線を接続端子等から取り外すことなく、単に電線に差し込むだけで電流を測定できる構造を有する電流センサーに関する。 The present invention relates to a current sensor for detecting a current flowing in an electric wire. In particular, the present invention relates to a current sensor having a structure capable of measuring a current simply by being inserted into an electric wire without removing the electric wire from a connection terminal or the like.

電線に流れる電流の検出は、その電流によって発生する磁界を検出することで行われている。このような磁界を検出し測定する手段には、磁性体のコアとコイルからなる電線を貫通させて測定する型の電流センサーが知られている。詳しくは、コアにコイルを巻回し、コアで電線を囲むと、電線に流れる電流によって発生する磁界が変化しコイルに電流が流れる。このコイルの電圧値に基づいて、電線に流れる電流値を測定するものである。 Detection of the current flowing through the electric wire is performed by detecting a magnetic field generated by the current. As a means for detecting and measuring such a magnetic field, there is known a current sensor of a type in which an electric wire composed of a magnetic core and a coil is passed through. Specifically, when the coil is wound around the core and the electric wire is surrounded by the core, the magnetic field generated by the current flowing through the electric wire changes, and the current flows through the coil. Based on the voltage value of the coil, the current value flowing through the electric wire is measured.

この原理を利用した電流センサーは、種々の構造を有するものが多数提案されている（例えば、特許文献１及び特許文献２）。特許文献１に記載された計器用変流器は、被測定導体である電線の導入が自在なＵ字形の空間部を有し、このＵ字形に一対の支腕部を備えている。この支腕部は、Ｕ字形の空間部内に導入された電線を保持するために、この空間部に開閉自在な機構である掛止片を備えている。 Many current sensors using this principle have various structures (for example, Patent Document 1 and Patent Document 2). The current transformer for an instrument described in Patent Document 1 has a U-shaped space portion into which an electric wire as a conductor to be measured can be freely introduced, and includes a pair of support arm portions in the U-shape. In order to hold the electric wire introduced into the U-shaped space portion, the support arm portion includes a latch piece that is a mechanism that can be freely opened and closed in the space portion.

この掛止片は、被測定導体を所定位置に把持し押圧するためのスプリングを備えている。また、固定センサアームと可動センサアームを備え、測定時には可動センサアームを開き、被測定導体である電線を押さえアームで所定位置に固定するものも提案されている（特許文献３）。 The latch piece includes a spring for holding and pressing the conductor to be measured at a predetermined position. There has also been proposed a device that includes a fixed sensor arm and a movable sensor arm, opens the movable sensor arm at the time of measurement, and fixes an electric wire, which is a conductor to be measured, at a predetermined position with a holding arm (Patent Document 3).

特開２００３−１３９８０１号公報JP 2003-139801 A 特開平７−１６７８９９号公報JP-A-7-167899 特開２００９−４１９２５号公報JP 2009-41925 A

しかながら、特許文献１〜３に記載された従来の磁気コア式の電流センサーは、Ｕ字状の測定空間の奧の位置に、電線を固定する機構を備えているが、測定するとき、電線への安定した取り付けが困難である。このために、電流センサーと被測定導体である電線との相対位置が測定毎にランダムに変化することである。言い換えると、従来のこれらの電線の固定機構は、電線を磁気コア式である電流センサーの所定の測定位置に固定することと、測定空間の中心線と電線の中心線との角度を一定角度になるように保持できない欠点がある。 However, the conventional magnetic core type current sensors described in Patent Documents 1 to 3 include a mechanism for fixing the electric wire at the position of the ridge of the U-shaped measurement space. It is difficult to attach to the camera stably. For this reason, the relative position between the current sensor and the electric wire that is the conductor to be measured changes randomly every measurement. In other words, these conventional wire fixing mechanisms fix the wire at a predetermined measurement position of a magnetic core type current sensor, and set the angle between the center line of the measurement space and the center line of the wire to a constant angle. There is a drawback that can not be held.

電線の軸中心線が磁気コアの中心線に一致するときと、一致しない斜めのときとは、電流センサーに対する電線の検出有効長さが異なる。このように、電線と電流センサーとの間の相対的な位置と角度が測定するたびに異なると、正しい測定が困難になり、測定誤差が出てくることになる。また、従来の２分割できない磁気コアの場合、磁気コア式の電流センサーを電線に取り付けるとき、電線をその磁気コア内に挿入できないので、電線を接続端子から取り付け、取り外しする必要があり、電気工事資格を有する者が取付け工事をしなくてはならないという制約がある。 The effective detection length of the electric wire with respect to the current sensor differs when the axial center line of the electric wire coincides with the center line of the magnetic core and when it does not coincide. As described above, if the relative position and angle between the electric wire and the current sensor are different each time it is measured, correct measurement becomes difficult and a measurement error occurs. In addition, in the case of a conventional magnetic core that cannot be divided into two parts, when a magnetic core type current sensor is attached to an electric wire, the electric wire cannot be inserted into the magnetic core. There is a restriction that a qualified person must perform installation work.

また、特許文献１〜３に記載の電流センサーの磁気コアの場合、測定時に磁気回路が磁性体による閉回路を構成しない又は、電線と電流センサーとの間の角度が相対的に傾きやすいので、微少な電流の測定は困難であり、かつ測定誤差も大きくなる。
本発明は上述のような技術背景のもとになされたものであり、下記の目的を達成する。
本発明の目的は、電流センサーと被測定導体との相対位置を一定にして、計測誤差が少なくする構造の電流センサーを提供することにある。 In the case of the magnetic core of the current sensor described in Patent Documents 1 to 3, the magnetic circuit does not constitute a closed circuit made of a magnetic material at the time of measurement, or the angle between the electric wire and the current sensor is relatively inclined. It is difficult to measure a minute current, and a measurement error increases.
The present invention has been made based on the technical background as described above, and achieves the following objects.
An object of the present invention is to provide a current sensor having a structure in which a relative position between a current sensor and a conductor to be measured is constant and measurement errors are reduced.

本発明の他の目的は、被測定導体である電線への取り付けと取り外しが容易な構造を有する電流センサーを提供することにある。
本発明の他の目的は、被測定導体である電線の被測定箇所(場所)にしっかり保持することができて、姿勢等が不安定にならない電流センサーを提供することにある。 Another object of the present invention is to provide a current sensor having a structure that can be easily attached to and detached from an electric wire as a conductor to be measured.
Another object of the present invention is to provide a current sensor that can be firmly held at a measurement location (place) of an electric wire that is a conductor to be measured and that does not become unstable in posture or the like.

本発明は、前記目的を達成するため、次の手段を採る。
本発明１の電流センサーは、
本体と、
前記本体に設けられ、磁性材からなるコアと、前記コアに巻かれたコイル又は磁束を検知する検知素子からなる検知部、及び被測定導体を着脱自在に保持固定するための保持部を備え、
前記保持部で前記被測定導体を保持し、前記検知部で前記被測定導体を流れる電流によって発生する磁束の変化に基づいて、前記被測定導体を流れる前記電流又は電力を測定するための電流センサーにおいて、
前記保持部は、前記本体に配置され、前記検知部を挟んでその近傍にそれぞれ配置され、前記被測定導体を両側から挟みこみで前記被測定導体を固定するための第１保持部と第２保持部とからなることを特徴とする。 In order to achieve the above object, the present invention employs the following means.
The current sensor of the present invention 1
The body,
Provided in the main body, comprising a core made of a magnetic material, a coil wound around the core or a detection unit consisting of a detection element for detecting magnetic flux, and a holding unit for detachably holding and fixing the conductor to be measured,
A current sensor for holding the measured conductor in the holding unit and measuring the current or power flowing through the measured conductor based on a change in magnetic flux generated by the current flowing through the measured conductor in the detection unit In
The holding part is disposed in the main body, and is arranged in the vicinity of the detection part, and a first holding part and a second holding part for fixing the measured conductor by sandwiching the measured conductor from both sides. And a holding portion.

本発明２の電流センサーは、
本体と、
前記本体に設けられ、固定磁性材と可動式磁性材からなるコアと、前記固定磁性材に巻かれたコイル又は磁束を検知する検知素子からなる検知部、及び被測定導体を挟み込んで着脱自在に固定するための保持部を備え、
前記保持部で前記被測定導体を保持し、前記検知部で前記被測定導体を流れる電流によって発生する磁束の変化に基づいて、前記被測定導体を流れる前記電流又は電力を測定するための電流センサーにおいて、
前記可動式磁性材は、第１可動式磁性材と第２可動式磁性材とからなり、
前記第１可動式磁性材、及び前記第２可動式磁性材は、前記本体内をそれぞれ移動し、
前記電流センサーの測定時、前記第１可動式磁性材、前記固定磁性材、及び前記第２可動式磁性材が互いに接触して、前記被測定導体を取り囲んで閉じた磁気回路を形成することを特徴とする。 The current sensor of the present invention 2
The body,
A core provided with the fixed magnetic material and a movable magnetic material, a coil wound around the fixed magnetic material, a detection unit consisting of a detection element for detecting magnetic flux, and a conductor to be measured are sandwiched between the core and the measurement subject. It has a holding part for fixing,
A current sensor for holding the measured conductor in the holding unit and measuring the current or power flowing through the measured conductor based on a change in magnetic flux generated by the current flowing through the measured conductor in the detection unit In
The movable magnetic material comprises a first movable magnetic material and a second movable magnetic material,
The first movable magnetic material and the second movable magnetic material move in the body, respectively.
When measuring the current sensor, the first movable magnetic material, the fixed magnetic material, and the second movable magnetic material are in contact with each other to form a closed magnetic circuit surrounding the conductor to be measured. Features.

本発明３の電流センサーは、本発明１において、
前記第１保持部は、前記本体内を移動し、前記被測定導体を保持する方向に第１バネと第２バネでそれぞれ付勢されている第１保持爪と第２保持爪からなり、前記第１保持爪と前記第２保持爪は前記被測定導体を両側から前記第１バネと前記第２バネのバネ圧で挟みこみ固定するものであり、
前記第２保持部は、前記本体内を移動し、前記被測定導体を保持する方向にそれぞれ第３バネと第４バネでそれぞれ付勢されている第３保持爪と第４保持爪からなり、前記第３保持爪と前記第４保持爪は前記被測定導体を両側から前記第３バネと前記第４バネのバネ圧で挟みこみ固定するものであることを特徴とする。 The current sensor of the present invention 3 is the present invention 1,
The first holding portion includes a first holding claw and a second holding claw that are moved in the main body and are urged by a first spring and a second spring in a direction to hold the conductor to be measured, The first holding claw and the second holding claw sandwich and fix the measured conductor from both sides with the spring pressure of the first spring and the second spring,
The second holding portion includes a third holding claw and a fourth holding claw that are moved in the main body and are urged by a third spring and a fourth spring, respectively, in a direction to hold the conductor to be measured. The third holding claw and the fourth holding claw are configured to sandwich and fix the measured conductor from both sides with spring pressures of the third spring and the fourth spring.

本発明４の電流センサーは、本発明２において、
前記第１可動式磁性材は、前記本体内を移動する第１スライダに搭載され、前記検知部測定位置方向に第５バネのバネ圧で付勢されており、
前記第２可動式磁性材は、前記本体を移動する第２スライダに搭載され、前記検知部の測定位置方向に第６バネのバネ圧で付勢されていることを特徴とする。 The current sensor of the present invention 4 is the present invention 2,
The first movable magnetic material is mounted on a first slider that moves within the main body, and is biased by a spring pressure of a fifth spring in the detection unit measurement position direction,
The second movable magnetic material is mounted on a second slider that moves the main body, and is biased by a spring pressure of a sixth spring in the measurement position direction of the detection unit.

本発明５の電流センサーは、本発明１又は２において、
前記検知部は、断面形状がＵ字形状の測定空間を成し、前記測定空間に前記被測定導体が入り込んで前記測定を行うことを特徴とする。 The current sensor of the present invention 5 is the present invention 1 or 2,
The detection section forms a measurement space having a U-shaped cross section, and the measurement conductor performs the measurement by entering the measurement space.

本発明６の電流センサーは、本発明３において、
前記第１保持爪、第２保持爪、第３保持爪、及び第４保持爪は、前記本体内で揺動可能な揺動型保持爪であることを特徴とする。 The current sensor of the sixth aspect of the present invention is the third aspect of the present invention.
The first holding claw, the second holding claw, the third holding claw, and the fourth holding claw are swing-type holding claws that can swing within the main body.

本発明７の電流センサーは、本発明２において、
前記第１可動式磁性材と前記第２可動式磁性材の接触面には、相互に挿入嵌合される凹部と凸部が形成されていることを特徴とする。 The current sensor of the present invention 7 is the present invention 2,
The contact surface of the first movable magnetic material and the second movable magnetic material is formed with a concave portion and a convex portion that are inserted and fitted to each other.

本発明によると、次の効果が奏される。本発明の電流センサーは、計測する電線への取り付けを容易に行える。詳しくは、本発明の電流センサーは、電線に押し付けるのみで、磁気コアの役割をする磁性板で囲まれ、閉じた磁気回路の内部に電線を差し込んで設置できるので、取り付けが容易でかつ正確な計測が可能となった。 According to the present invention, the following effects can be obtained. The current sensor of the present invention can be easily attached to the electric wire to be measured. Specifically, the current sensor of the present invention can be installed by simply pressing it on the electric wire, surrounded by a magnetic plate serving as a magnetic core, and inserted into the closed magnetic circuit so that it can be installed easily and accurately. Measurement became possible.

また、電流を計測するとき、電線を接続端子から取り外した後、再び取り付ける必要がなくなり、電気工事資格者ではなくとも使用が可能になった。更に、本発明の電流センサーによる電線の把持機構は、上下２箇所で電線を把持するので、測定時に電線の保持姿勢、保持位置が一定になるので、正確な計測が可能となった。 Also, when measuring the current, it is no longer necessary to reattach the wires after removing them from the connection terminals, making it possible to use them even if you are not a qualified electrician. Furthermore, since the electric wire gripping mechanism using the current sensor according to the present invention grips the electric wire at two positions, the holding posture and holding position of the electric wire are constant at the time of measurement, so that accurate measurement is possible.

図１は、本発明の第１の実施の形態の電流センサー１の外観を示す斜視図である。FIG. 1 is a perspective view showing an appearance of a current sensor 1 according to a first embodiment of the present invention. 図２は、本発明の第１の実施の形態の電流センサー１の構成部品を示す分解部品図である。FIG. 2 is an exploded parts diagram showing components of the current sensor 1 according to the first embodiment of the present invention. 図３は、本発明の第１の実施の形態の電流センサー１の検知部５を図１のＡ−Ａ線で切断した断面図である。FIG. 3 is a cross-sectional view of the detection unit 5 of the current sensor 1 according to the first embodiment of the present invention, taken along line AA in FIG. 図４は、本発明の第１の実施の形態の電流センサー１の第１保持部６ａの断面を示す断面図である。FIG. 4 is a cross-sectional view showing a cross section of the first holding portion 6a of the current sensor 1 according to the first embodiment of the present invention. 図５は、磁性板７ｃにコイル２０を巻いた例を示す断面図である。FIG. 5 is a cross-sectional view showing an example in which the coil 20 is wound around the magnetic plate 7c. 図６は、本発明の第２の実施の形態の電流センサー１０の検知部の断面を示す断面図である。FIG. 6 is a cross-sectional view showing a cross section of the detection unit of the current sensor 10 according to the second embodiment of the present invention. 図７は、本発明の第３の実施の形態の電流センサー１２の第１保持部の概要を示す概念図である。FIG. 7 is a conceptual diagram showing an outline of the first holding unit of the current sensor 12 according to the third embodiment of the present invention.

本発明の第１の実施の形態である電流センサーを、図面を参照しながら説明する。図１は、本発明の第１の実施の形態である電流センサー１の外観を示す斜視図である。図２は、本発明の第１の実施の形態である電流センサー１を、その構成部品毎に分解した分解部品図である。電流センサー１は、図１に図示するように、被測定導体の電線２に取付けて、電線２を流れる電流を測定するためのものである。 A current sensor according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a current sensor 1 according to a first embodiment of the present invention. FIG. 2 is an exploded part diagram in which the current sensor 1 according to the first embodiment of the present invention is disassembled for each component. As shown in FIG. 1, the current sensor 1 is attached to the electric wire 2 of the conductor to be measured and is used to measure the current flowing through the electric wire 2.

電流センサー１は、断面形状がＵ字の形状を成す溝である空間部３を有し、電流測定時、この空間部３に電線２を差し込み、その中を流れる電流を測定する。詳しくは、電流センサー１には、空間部３の導入口からその空間部３の最奥（Ｕ字の底部）まで電線２を差し込んで、所定位置に保持し、この状態で電線２を流れる電流を測定する。その測定の原理は、上述した通り、電線２内に流れる電流によってコイルに発生する誘導磁界を検知するものである。 The current sensor 1 has a space portion 3 that is a groove having a U-shaped cross section. At the time of current measurement, the electric wire 2 is inserted into the space portion 3 and a current flowing through the space portion 3 is measured. Specifically, in the current sensor 1, the electric wire 2 is inserted from the introduction port of the space portion 3 to the innermost part (bottom of the U-shape) of the space portion 3, held at a predetermined position, and the current flowing through the electric wire 2 in this state Measure. The principle of the measurement is to detect the induced magnetic field generated in the coil by the current flowing in the electric wire 2 as described above.

電流センサー１は、誘導磁界を検知する検知部５（図２を参照。）と、電線２を位置決めし保持固定するための、上下（図示上）に配置された一対の第１保持部６ａ、第２保持部６ｂ等からなる。検知部５と、この上下に配置された第１保持部６ａ、及び第２保持部６ｂは、ケース４に内蔵されている。合成樹脂製のケース４は、ケース本体４ｃ、上蓋４ａ、底蓋４ｂ等からなる（図２を参照。）。 The current sensor 1 includes a detection unit 5 (see FIG. 2) that detects an induced magnetic field, and a pair of first holding units 6a that are disposed above and below (on the drawing) for positioning, holding, and fixing the electric wire 2. It consists of the second holding part 6b and the like. The detection unit 5 and the first holding unit 6 a and the second holding unit 6 b arranged above and below are built in the case 4. The case 4 made of synthetic resin includes a case body 4c, an upper lid 4a, a bottom lid 4b, and the like (see FIG. 2).

ケース本体４ｃは、検知部５及び第１保持部６ａ、第２保持部６ｂ等を収納するための電流センサー１の本体部品である。ケース本体４ｃの前部（図示上）には、前述した断面形状がＵ字の形状である空間部３が形成されている。空間部３の上下には、誘導磁界を検知するときに電線２を固定保持する一対の第１保持部６ａ、第２保持部６ｂが配置され、この第１保持部６ａと第２保持部６ｂの中間部には、誘導磁界を検知する検知部５が配置されている。 The case main body 4c is a main body part of the current sensor 1 for housing the detection unit 5, the first holding unit 6a, the second holding unit 6b, and the like. A space 3 having a U-shaped cross section as described above is formed in the front portion (in the drawing) of the case body 4c. Above and below the space portion 3, a pair of first holding portion 6 a and second holding portion 6 b for fixing and holding the electric wire 2 when detecting an induced magnetic field is disposed, and the first holding portion 6 a and the second holding portion 6 b. In the middle part, a detector 5 for detecting the induced magnetic field is arranged.

上蓋４ａは、ケース本体４ｃの上部を閉じる蓋であり、底蓋４ｂはケース本体４ｃの底部を閉じる蓋である。この底蓋４ｂには後述する回路基板８が搭載されている。上蓋４ａと一体に形成された２個の係止部４ａ’は、ケース本体４ｃに形成された２個の嵌合部４ｃ’に嵌め込むための部分である。２個の係止部４ａ’をそれぞれ嵌合部４ｃ’に嵌め込み、上蓋４ａをケース本体４ｃに固定する。 The upper lid 4a is a lid that closes the upper portion of the case body 4c, and the bottom lid 4b is a lid that closes the bottom of the case body 4c. A circuit board 8 to be described later is mounted on the bottom lid 4b. The two locking portions 4a 'formed integrally with the upper lid 4a are portions for fitting into the two fitting portions 4c' formed on the case body 4c. The two locking portions 4a 'are fitted into the fitting portions 4c', and the upper lid 4a is fixed to the case body 4c.

同様に、底蓋４ｂと一体に形成された４個の係止部４ｂ’は、ケース本体４ｃに形成された４個の嵌合部４ｄ’にそれぞれ嵌め込まれ、底蓋４ｂをケース本体４ｃに固定する。底蓋４ｂ及び上蓋４ａの前部（図示上）には、ケース本体４ｃの空間部３の形状に沿った略Ｕ字形の切欠きが形成されている。 Similarly, the four locking portions 4b ′ formed integrally with the bottom cover 4b are respectively fitted into the four fitting portions 4d ′ formed on the case body 4c, and the bottom cover 4b is attached to the case body 4c. Fix it. A substantially U-shaped notch along the shape of the space 3 of the case body 4c is formed in the front portion (in the drawing) of the bottom lid 4b and the top lid 4a.

〔検知部５〕
ケース本体４ｃの空間部３の最奥（底部）で、かつ検知部５が配置されている位置の断面形状は、略半円形、又はＣ字形を呈している（図３参照）。検知部５は、電線２を流れる電流を検知するものであり、磁気回路を形成するコア、検知コイル２０、回路基板８等からなる。このコアは、図２に図示したように、磁性板７ａ、検知コイル２０が巻かれた磁性板７ｃ、及び磁性板７ｂから構成される。検知コイル２０が巻かれた磁性板７ｃは、ケース本体４ｃ内に固定されている。 [Detector 5]
The cross-sectional shape at the innermost position (bottom) of the space 3 of the case body 4c and the position at which the detection unit 5 is disposed is substantially semicircular or C-shaped (see FIG. 3). The detection part 5 detects the electric current which flows through the electric wire 2, and consists of the core which forms a magnetic circuit, the detection coil 20, and the circuit board 8 grade | etc.,. As shown in FIG. 2, the core includes a magnetic plate 7a, a magnetic plate 7c around which the detection coil 20 is wound, and a magnetic plate 7b. The magnetic plate 7c around which the detection coil 20 is wound is fixed in the case body 4c.

磁性板７ｃの形状は、空間部３の形状に相似するように、断面形状がＵ字状（以下、平行部分を支腕部ともいう。）で、その両端に平坦部を有している。コイルはこのＵ字部分に巻かれている。図３に示すように、磁性板７ｃのケース本体４ｃへの固定は、ケース本体４ｃに形成され、断面形状がＵ字状のスリットに挿入して固定する。そして、磁性板７ｃの両端の平坦部は、後述するケース本体４ｃに形成され、スライダ８ａ、スライド８ｂの案内面４ｄに接している。 The shape of the magnetic plate 7 c is U-shaped in cross section (hereinafter, the parallel portion is also referred to as a support arm portion) so as to be similar to the shape of the space portion 3, and has flat portions at both ends thereof. The coil is wound around this U-shaped part. As shown in FIG. 3, the magnetic plate 7c is fixed to the case body 4c by being inserted into a slit formed in the case body 4c and having a U-shaped cross section. And the flat part of the both ends of the magnetic board 7c is formed in the case main body 4c mentioned later, and is contacting the guide surface 4d of the slider 8a and the slide 8b.

磁性板７ａ、及び磁性板７ｂは、対向して配置され、各々ケース本体４ｃ内に収納されているが、磁性板７ｃとケース本体４ｃとの間で相対的にスライドする可動式の部品である。検知部５は、磁性板７ａ、７ｂを、各々個別に前述のスライドをさせるためのスライド機構を有する。一方のスライド機構は、スライダ８ａ、コイルバネ８ｃ、スライダ蓋８ｅからなる（図２、３参照）。このスライダ８ａには、磁性板７ａが搭載されている。これと対向して配置された他方のスライド機構は、同様に、スライダ８ｂ、コイルバネ８ｄ、スライダ蓋８ｆからなる。 The magnetic plate 7a and the magnetic plate 7b are arranged to face each other and are housed in the case main body 4c, but are movable parts that slide relatively between the magnetic plate 7c and the case main body 4c. . The detection unit 5 has a slide mechanism for causing the magnetic plates 7a and 7b to individually slide as described above. One slide mechanism includes a slider 8a, a coil spring 8c, and a slider lid 8e (see FIGS. 2 and 3). A magnetic plate 7a is mounted on the slider 8a. Similarly, the other slide mechanism arranged opposite to this comprises a slider 8b, a coil spring 8d, and a slider lid 8f.

このスライダ８ｂには、磁性板７ｂの中間部と合致するスリットが形成されており（図３参照）、このスリットに磁性板７ｂが挿入固定して搭載されている。従って、磁性板７ｂの両端は、スライダ８ｂのスリットから露出していることになる。コイルバネ８ｄの一端は、スライダ８ｂに形成された止まり穴に挿入されている。このコイルバネ８ｄは、後部のスライダ蓋８ｆとスライダ８ｂの間に配置されているので（図３参照）、スライダ８ｂはケース本体４ｃに形成された貫通孔の内面である案内面４ｄ上を摺動する。 The slider 8b is formed with a slit that matches the intermediate portion of the magnetic plate 7b (see FIG. 3), and the magnetic plate 7b is inserted and fixed in the slit. Therefore, both ends of the magnetic plate 7b are exposed from the slits of the slider 8b. One end of the coil spring 8d is inserted into a blind hole formed in the slider 8b. Since this coil spring 8d is disposed between the rear slider lid 8f and the slider 8b (see FIG. 3), the slider 8b slides on the guide surface 4d which is the inner surface of the through hole formed in the case body 4c. To do.

同様の構造で、スライダ８ｂに対向して、スライダ８ａがケース本体４ｃに摺動自在に配置されており、コイルバネ８ｃは、後部のスライダ蓋８ｅとスライダ８ａの間に配置されている。スライダ８ａとスライダ８ｂには、この両端部が露出（表面を覆う）するように、板材で作られた磁性板７ａと磁性板７ｂがそれぞれ挿入固定されている（図３参照）。結局、磁性板７ａと磁性板７ｂは、前述した磁性板７ｃの両端の平坦部に接しており、電流測定時、空間部３の入口を塞ぐように配置されていることになる。 With the same structure, the slider 8a is slidably disposed on the case body 4c so as to face the slider 8b, and the coil spring 8c is disposed between the rear slider lid 8e and the slider 8a. A magnetic plate 7a and a magnetic plate 7b made of a plate material are inserted and fixed to the slider 8a and the slider 8b, respectively, so that both end portions are exposed (cover the surface) (see FIG. 3). Eventually, the magnetic plate 7a and the magnetic plate 7b are in contact with the flat portions at both ends of the magnetic plate 7c described above, and are arranged so as to close the entrance of the space portion 3 during current measurement.

磁性板７ａと磁性板７ｂは、磁性体で作られており、磁性体で作られた磁性板７ｃと共に、測定時には閉じた磁気回路を形成する。閉じた磁気回路を形成することにより、測定精度が向上する。以上の構造から理解されるように、検知部５は、測定のために電線２を取り込んだ後は、図３に示すように、磁性板７ａと磁性板７ｂの先端は突き当たって当接して互いに接触し、かつコイルが巻かれた磁性板７ｃの両端部と、磁性板７ａと磁性板７ｂの後端部はそれぞれ互いに接触することになる。 The magnetic plate 7a and the magnetic plate 7b are made of a magnetic material, and together with the magnetic plate 7c made of a magnetic material, form a closed magnetic circuit at the time of measurement. By forming a closed magnetic circuit, the measurement accuracy is improved. As can be understood from the above structure, after detecting the electric wire 2 for measurement, the detection unit 5 abuts against and abuts the tips of the magnetic plate 7a and the magnetic plate 7b as shown in FIG. Both end portions of the magnetic plate 7c in contact with each other and the rear end portions of the magnetic plate 7a and the magnetic plate 7b are in contact with each other.

ケース本体４ｃの前方の上下（図示上）に配置された一対の第１保持部６ａ、第２保持部６ｂは、電線２を上下で保持するための保持機構である。第１保持部６ａ、第２保持部６ｂは、電流センサー１を電線２に固定して保持するためのものである。この一対の第１保持部６ａ、第２保持部６ｂは、検知部５の上下に位置するものであり、同じ把持機構である。言い換えると、第１保持部６ａと第２保持部６ｂは、上下の２箇所で電線２を保持することにより、空間部３の奥（底部）までに差し込まれ、挿入された電線２を所定位置と角度で把持し、電流センサー１に正確に固定する。 A pair of first holding part 6a and second holding part 6b disposed on the top and bottom (in the drawing) in front of the case body 4c is a holding mechanism for holding the electric wire 2 up and down. The 1st holding | maintenance part 6a and the 2nd holding | maintenance part 6b are for fixing the current sensor 1 to the electric wire 2, and holding it. The pair of first holding unit 6a and second holding unit 6b are located above and below the detection unit 5 and are the same gripping mechanism. In other words, the first holding part 6a and the second holding part 6b hold the electric wire 2 at the upper and lower two places, and are inserted into the back (bottom part) of the space part 3 to place the inserted electric wire 2 at a predetermined position. And is fixed to the current sensor 1 accurately.

第１保持部６ａと第２保持部６ｂは互いに所定距離離れている。第１保持部６ａ、第２保持部６ｂは、検知部５の上下に配置されているので、磁性板７ｃの円孔の中心線と、電線２の中心線とが平行になるように、保持固定することができる。前述したように、検知部５、第１保持部６ａ、及び第２保持部６ｂは、ケース本体４ｃに収納されている。また、ケース本体４ｃの内部には、回路基板８が内蔵されている。本例では、回路基板８は、底蓋４ｂに固定されている。 The first holding part 6a and the second holding part 6b are separated from each other by a predetermined distance. Since the 1st holding | maintenance part 6a and the 2nd holding | maintenance part 6b are arrange | positioned at the upper and lower sides of the detection part 5, it hold | maintains so that the centerline of the circular hole of the magnetic board 7c and the centerline of the electric wire 2 may become parallel. Can be fixed. As described above, the detection unit 5, the first holding unit 6a, and the second holding unit 6b are housed in the case body 4c. A circuit board 8 is built in the case body 4c. In this example, the circuit board 8 is fixed to the bottom cover 4b.

回路基板８は、検知部５のコアとコイル２０（図５を参照。）で検知した信号を処理するための電気回路又は電子回路である。コイル２０は、磁性板７ｃに巻かれている。電線２を電流が流れると、その周囲に交番磁界が発生し、この交番磁界の磁束は、磁性板７ｃを含むコアを流れる。この磁束の変化によって、コイル２０に誘導起電力が発生する。回路基板８は、コイル２０に発生した誘導起電力を信号処理して、電線２を流れる電流を計算して出力する。 The circuit board 8 is an electric circuit or an electronic circuit for processing a signal detected by the core of the detection unit 5 and the coil 20 (see FIG. 5). The coil 20 is wound around the magnetic plate 7c. When a current flows through the electric wire 2, an alternating magnetic field is generated around the electric wire 2, and the magnetic flux of the alternating magnetic field flows through the core including the magnetic plate 7c. Due to this change in magnetic flux, an induced electromotive force is generated in the coil 20. The circuit board 8 performs signal processing on the induced electromotive force generated in the coil 20 and calculates and outputs the current flowing through the electric wire 2.

ただし、電線２の電流を検知する手段として、コイル２０の他に種々の半導体素子を利用することができる。例えば、ホール素子、ＧＭＲ(Giant Magneto-Resistance effect)素子、ＡＭＲ（Anisotropic Magneto Resistance)素子、ＴＭＲ(Tunnel Magneto-Resistance effect)素子等の磁界検知素子を利用する場合は、コイル２０が不要になり、その代わり、磁性板７ｃに近傍に又は、磁性板７ｃに接触して又は、磁性板７ｃからなるコアの隙間に、ホール素子、ＧＭＲ、ＡＭＲ、ＴＭＲ素子等の素子が配置され、これらの素子で検知した信号を回路基板８で信号処理する。 However, various semiconductor elements other than the coil 20 can be used as means for detecting the current of the electric wire 2. For example, when a magnetic field detection element such as a Hall element, a GMR (Giant Magneto-Resistance effect) element, an AMR (Anisotropic Magneto Resistance) element, or a TMR (Tunnel Magneto-Resistance effect) element is used, the coil 20 becomes unnecessary. Instead, elements such as Hall elements, GMR, AMR, and TMR elements are arranged in the vicinity of the magnetic plate 7c, in contact with the magnetic plate 7c, or in the gap between the cores made of the magnetic plate 7c. The detected signal is processed by the circuit board 8.

回路基板８はこの検知信号を信号処理して、最終的に、電線２を流れる電流、又は電力を計算して出力する。磁界検知素子としては、磁界の強度に応じて抵抗値が変化する磁気抵抗効果を利用した磁気抵抗素子であるＧＭＲ素子、ＡＭＲ素子、ＴＭＲ素子等を用いることができる。詳しくは、巨大磁気抵抗効果を利用したＧＭＲ素子、特定の磁界方向で抵抗値が変わる効果を利用したＡＭＲ素子、トンネル効果により絶縁体に電流額流れる効果を利用したＴＭＲ素子等を磁界検知素子として利用することができる。 The circuit board 8 processes the detection signal, and finally calculates and outputs the current or power flowing through the electric wire 2. As the magnetic field detecting element, a GMR element, an AMR element, a TMR element, or the like, which is a magnetoresistive element using a magnetoresistive effect whose resistance value changes according to the strength of the magnetic field, can be used. Specifically, a GMR element using a giant magnetoresistive effect, an AMR element using an effect of changing a resistance value in a specific magnetic field direction, a TMR element using an effect of flowing current through an insulator by a tunnel effect, and the like as a magnetic field detection element. Can be used.

電線２に電流が流れた際に発生する磁界に応じて磁気抵抗素子の抵抗が変化する。詳しくは、磁気抵抗素子を貫通するこの磁界の磁束線に応じて、磁気抵抗素子の抵抗が変化し、この抵抗の変化を測定し、回路基板８に出力する。ホール素子の場合は、電線２に電流が流れた際に発生する磁界の磁束は、ホール素子を貫通するとき、ホール効果によるホール電圧がホール素子に発生し、このホール電圧を、回路基板８に出力する。 The resistance of the magnetoresistive element changes according to the magnetic field generated when a current flows through the electric wire 2. Specifically, the resistance of the magnetoresistive element changes according to the magnetic flux lines of this magnetic field that penetrate the magnetoresistive element, and the change in resistance is measured and output to the circuit board 8. In the case of a Hall element, the magnetic flux generated when a current flows through the electric wire 2 generates a Hall voltage due to the Hall effect when passing through the Hall element. This Hall voltage is applied to the circuit board 8. Output.

〔検知部５の機能〕
図３は、本発明の第１の実施の形態の電流センサー１の検知部５の断面Ａ−Ａ（図１参照。）を示す断面図である。図示したように、磁性板７ｃは、ケース本体４ｃの中央付近に位置し、空間部３の奥から入口にかけて配置されている。磁性板７ｃは、測定時には電線２を取り囲むように配置したものである。磁性板７ｃは、前述したように磁性体からなる平板を折り曲げて、電線２を取り囲むような形状であり、半月形状、Ｕ字形状である。 [Function of detection unit 5]
FIG. 3 is a cross-sectional view showing a cross section AA (see FIG. 1) of the detection unit 5 of the current sensor 1 according to the first embodiment of the present invention. As illustrated, the magnetic plate 7c is located near the center of the case body 4c and is arranged from the back of the space 3 to the entrance. The magnetic plate 7c is arranged so as to surround the electric wire 2 at the time of measurement. As described above, the magnetic plate 7c is shaped to surround the electric wire 2 by bending a flat plate made of a magnetic material, and has a half-moon shape and a U-shape.

磁性板７ｃは、本例では四角形の板を略Ｕ字の形状に折り曲げた形状であり、ケース本体４ｃの空間３の奥の略半円形の周りを沿って配置されている。磁性板７ｃは、略円形を半割した略半円形部とその両端が略平行に伸びた両端部（接触部）からなる構造である。磁性板７ｃの両端部は、磁性板７ａ、磁性板７ｂに摺動して接触する部分である。電線２は空間部３に差し込まれるが、磁性板７ｃはケース本体４ｃのスリットに挿入固定されているので、電線２と磁性板７ｃは直接接触することはない（図３参照）。 In this example, the magnetic plate 7c has a shape obtained by bending a square plate into a substantially U shape, and is arranged around a substantially semicircular shape at the back of the space 3 of the case body 4c. The magnetic plate 7c has a structure composed of a substantially semicircular portion obtained by halving a substantially circular shape and both end portions (contact portions) whose both ends extend substantially in parallel. Both end portions of the magnetic plate 7c are portions that slide and come into contact with the magnetic plate 7a and the magnetic plate 7b. Although the electric wire 2 is inserted in the space part 3, since the magnetic plate 7c is inserted and fixed in the slit of the case body 4c, the electric wire 2 and the magnetic plate 7c do not contact directly (refer FIG. 3).

前述したように、測定時には、磁性板７ａと磁性板７ｂの側面は、固定された磁性板７ｃの両端部にそれぞれ接触し、かつその先端面は互いに当接して接触する。これにより、磁性体で作られた磁性板７ａ、磁性板７ｂ、磁性板７ｃが連続して接触した構成になり、閉じた磁気回路を形成する（図３参照）。磁性板７ａと磁性板７ｂは、四角形の磁性板を曲げたものである。本例では、磁性板７ａと磁性板７ｂが互いに接触（当接）する接触端部は、接触面を確保するために、その先端を略Ｌ字形に曲げて形成されている。 As described above, at the time of measurement, the side surfaces of the magnetic plate 7a and the magnetic plate 7b are in contact with both end portions of the fixed magnetic plate 7c, and their tip surfaces are in contact with each other. Accordingly, the magnetic plate 7a, the magnetic plate 7b, and the magnetic plate 7c made of a magnetic material are continuously in contact with each other, and a closed magnetic circuit is formed (see FIG. 3). The magnetic plate 7a and the magnetic plate 7b are formed by bending a rectangular magnetic plate. In this example, the contact end where the magnetic plate 7a and the magnetic plate 7b contact (contact) each other is formed by bending its tip into a substantially L shape in order to secure a contact surface.

磁性板７ａと磁性板７ｂの他の端部は、スライダ８ａとスライダ８ｂに挿入して固定されている（図３参照）。スライダ８ａとスライダ８ｂの動きに伴って、磁性板７ａと磁性板７ｂは互いに離れその間に隙間が生じたり、再び接近し接触したりする。図３に示すように、空間部３の電線２の挿入側（入口）のスライダ８ａとスライダ８ｂの側面は、磁性板７ａと磁性板７ｂでカバーされていない。スライダ８ａとスライダ８ｂには、空間部３の電線２の挿入側は傾斜面が形成されている。 The other end portions of the magnetic plate 7a and the magnetic plate 7b are inserted and fixed to the slider 8a and the slider 8b (see FIG. 3). With the movement of the slider 8a and the slider 8b, the magnetic plate 7a and the magnetic plate 7b are separated from each other, and a gap is formed between them, or they approach and come into contact again. As shown in FIG. 3, the side surfaces of the slider 8a and the slider 8b on the insertion side (entrance) of the electric wire 2 in the space 3 are not covered with the magnetic plate 7a and the magnetic plate 7b. The slider 8a and the slider 8b are formed with inclined surfaces on the insertion side of the electric wire 2 in the space 3.

この傾斜面に電線３が当接され押圧されると、スライダ８ａとスライダ８ｂにそれぞれ分力が働き、スライダ８ａとスライダ８ｂが、スライダバネ８ｃ、８ｄのバネ圧に抗して左右（図３の図示上）に開く。同様に、スライダ８ａとスライダ８ｂには、空間部３の奧側には傾斜面が形成されており、測定が終了し電線２が空間部３から出るときに、スライダ８ａとスライダ８ｂにそれぞれ分力が働き、スライダ８ａとスライダ８ｂが左右に開くことになる。 When the electric wire 3 is brought into contact with and pressed against the inclined surface, a component force is applied to the slider 8a and the slider 8b, respectively, so that the slider 8a and the slider 8b move to the left and right (see FIG. 3) against the spring pressure of the slider springs 8c and 8d. Open on top. Similarly, the slider 8a and the slider 8b have an inclined surface on the heel side of the space portion 3, and when the measurement is finished and the electric wire 2 exits the space portion 3, the slider 8a and the slider 8b are divided into the slider 8a and the slider 8b, respectively. The force works, and the slider 8a and the slider 8b are opened to the left and right.

更に、電線２が空間部３から出ると、スライダ８ａとスライダ８ｂはスライダバネ８ｃ、８ｄのバネ力で閉じる。更に、電線２が空間部３に侵入すると、スライダ８ａとスライダ８ｂはスライダバネ８ｃ、８ｄのバネ力で閉じる。これにより磁性板７ａ、７ｂは接触し、磁性板７ｃと一緒に閉じた磁気回路を形成する。 Further, when the electric wire 2 comes out of the space portion 3, the slider 8a and the slider 8b are closed by the spring force of the slider springs 8c and 8d. Further, when the electric wire 2 enters the space 3, the slider 8a and the slider 8b are closed by the spring force of the slider springs 8c and 8d. As a result, the magnetic plates 7a and 7b come into contact with each other to form a closed magnetic circuit together with the magnetic plate 7c.

〔第１保持部６ａ、第２保持部６ｂ〕
電線２を保持する保持機構は、前述したように、第１保持部６ａと第２保持部６ｂからなり、それぞれ保持爪９ａ、９ｂと保持爪バネ１０ａ、１０ｂからなる。第１保持部６ａは、検知部５とケース蓋４ａの間に設置され、第２保持部６ｂは、検知部５とケース底４ｂの間に設置される。第１保持部６ａと第２保持部６ｂは、同じ構造と同じ機能であるので、以下は、第１保持部６ａのみを例に説明する。 [First holding portion 6a, second holding portion 6b]
As described above, the holding mechanism that holds the electric wire 2 includes the first holding portion 6a and the second holding portion 6b, and includes holding claws 9a and 9b and holding claw springs 10a and 10b, respectively. The first holding unit 6a is installed between the detection unit 5 and the case lid 4a, and the second holding unit 6b is installed between the detection unit 5 and the case bottom 4b. Since the first holding unit 6a and the second holding unit 6b have the same structure and the same function, only the first holding unit 6a will be described below as an example.

図４は、本発明の第１の実施の形態の電流センサー１の第１保持部６ａの断面を示す断面図である。第１保持部６ａの保持爪９ａ、９ｂは、本例では、両方とも同じ板状のものであり、ケース本体４ｃの空間部３の上部に配置されている。ケース本体４ｃの上部には、長方体の内部空間を有し、この内部空間に保持爪９ａ、９ｂが対向して配置されている。保持爪９ａ、９ｂは、ケース本体４ｃと下蓋４ｂとの間で摺動自在に設けられている。この摺動方向は、空間部３の中心方向である。 FIG. 4 is a cross-sectional view showing a cross section of the first holding portion 6a of the current sensor 1 according to the first embodiment of the present invention. In this example, the holding claws 9a and 9b of the first holding portion 6a are both in the same plate shape, and are disposed on the upper portion of the space portion 3 of the case body 4c. At the upper part of the case main body 4c, there is a rectangular internal space, and holding claws 9a, 9b are arranged facing this internal space. The holding claws 9a and 9b are slidably provided between the case main body 4c and the lower lid 4b. This sliding direction is the central direction of the space 3.

即ち、図４に示すように、保持爪９ａ、９ｂの一方の側面は、ケース本体４ｃの壁と平行であるが、ケース本体４ｃの壁までに隙間を有している。この隙間によって、保持爪９ａ、９ｂｆは、互いに空間部３の中心方向へ摺動可能である。保持爪バネ１０ａ、１０ｂの一端は、ケース本体４ｃに係合又は固定され、保持爪バネ１０ａ、１０ｂの他端は、保持爪９ａ、９ｂに係合又は固定される。本例では、保持爪９ａ、９ｂには、保持爪バネ１０ａ、１０ｂの他端を係止するための止まり穴を有する。 That is, as shown in FIG. 4, one side surface of the holding claws 9a and 9b is parallel to the wall of the case body 4c, but has a gap to the wall of the case body 4c. By this gap, the holding claws 9a and 9bf can slide in the center direction of the space portion 3. One end of the holding claw springs 10a, 10b is engaged or fixed to the case body 4c, and the other end of the holding claw springs 10a, 10b is engaged or fixed to the holding claws 9a, 9b. In this example, the holding claws 9a and 9b have blind holes for locking the other ends of the holding claw springs 10a and 10b.

この構造により、電線２を差し込むときに保持爪９ａ、９ｂがスライドして開くと、保持爪バネ１０ａ、１０ｂが圧縮され、保持爪９ａ、９ｂを互いに閉じるための力が蓄えられる。言い換えると、スライドバネ１０ａ、１０ｂは、保持爪９ａ、９ｂをスライドさせるためのものである。１対の保持爪９ａ、９ｂが閉じたとき、その中央部に三角形状の貫通孔が形成され（図４参照）、この貫通孔に入った電線２を両側からスライドバネ１０ａ、１０ｂのバネ力で挟んで保持する。 With this structure, when the holding claws 9a and 9b slide and open when the electric wire 2 is inserted, the holding claw springs 10a and 10b are compressed, and a force for closing the holding claws 9a and 9b is stored. In other words, the slide springs 10a and 10b are for sliding the holding claws 9a and 9b. When the pair of holding claws 9a and 9b are closed, a triangular through hole is formed at the center thereof (see FIG. 4), and the wire 2 entering the through hole is moved from both sides by the spring force of the slide springs 10a and 10b. Hold between.

即ち、保持爪９ａ、９ｂの三角形状を成す傾斜面がテーパーとなり、電線２を奧の方向（空間部３の底部）に配置する力が働き、電線２は、ケース４ｃの空間３の奥のＵ字部を介して磁性板７ｃのコイル２０（図５を参照。）に間接的に接することになる。結局、電線２は、１対の保持爪９ａ、９ｂと磁性板７ｃに挟まれた位置で保持される。ただし、この貫通孔の形状は、電線２が入るようなものであれば任意の形状に形成しても良い。例えば、保持爪９ａ、９ｂによって形成される貫通孔の形状は、三角形、略三角形等の多角形、楕円形等の形状であっても良い。 That is, the triangular inclined surfaces of the holding claws 9a and 9b are tapered, and the force for placing the electric wire 2 in the direction of the heel (the bottom of the space portion 3) works, and the electric wire 2 is located behind the space 3 of the case 4c. It will contact indirectly with the coil 20 (refer FIG. 5) of the magnetic board 7c via a U-shaped part. Eventually, the electric wire 2 is held at a position sandwiched between the pair of holding claws 9a and 9b and the magnetic plate 7c. However, the shape of the through hole may be formed in an arbitrary shape as long as the electric wire 2 can be inserted. For example, the shape of the through hole formed by the holding claws 9a and 9b may be a polygon such as a triangle or a substantially triangle, or a shape such as an ellipse.

また、保持爪９ａと保持爪９ｂが接触する部分で、空間部３の導入側で電線２が差し込まれる入口部分は、傾斜角度を有する傾斜面構造である。電線２がこの傾斜面に接触し、更に力を加えて電線２を押し込むと、押し込むときの力の分力により、１対の保持爪９ａ、９ｂは、両側へ開き隙間ができる。電線２がこのできた隙間から、保持爪９ａ、９ｂの間を通過して、保持爪９ａ、９ｂが形成する貫通孔までに差し込まれる。 Moreover, the entrance part into which the electric wire 2 is inserted on the introduction side of the space 3 at the part where the holding claw 9a and the holding claw 9b are in contact has an inclined surface structure having an inclination angle. When the electric wire 2 comes into contact with the inclined surface and pushes in the electric wire 2 by applying further force, the pair of holding claws 9a and 9b are opened to both sides due to the component force of the pushing-in force. The electric wire 2 passes through the gap between the holding claws 9a and 9b and is inserted into the through hole formed by the holding claws 9a and 9b.

電線２が貫通孔に入ると、保持爪９ａ、９ｂは、両側から保持爪バネ１０ａ、１０ｂによって引き寄せられて、電線２を挟み込み固定する。このようにして保持爪９ａ、９ｂは電線２を両側から挟みこみ固定するものである。同様に、保持爪９ａと保持爪９ｂには、空間部３の奧側は傾斜角度を有する傾斜面構造である。測定が終了し電線２が空間部３、言い換えると保持爪９ａ、９ｂの貫通孔から出るときに、電線２がこの傾斜面に接触し、更に力を加えて電線２を引っ張ると、引っ張るときの力の分力により、１対の保持爪９ａ、９ｂは、両側へ開き隙間ができる。 When the electric wire 2 enters the through hole, the holding claws 9a and 9b are attracted by the holding claw springs 10a and 10b from both sides, and the electric wire 2 is sandwiched and fixed. In this way, the holding claws 9a and 9b sandwich and fix the electric wire 2 from both sides. Similarly, the holding claw 9a and the holding claw 9b have an inclined surface structure in which the heel side of the space portion 3 has an inclination angle. When the measurement is finished and the electric wire 2 comes out of the space portion 3, in other words, through the through holes of the holding claws 9a and 9b, the electric wire 2 comes into contact with the inclined surface, and when the electric wire 2 is pulled by applying further force, Due to the force component, the pair of holding claws 9a and 9b open to both sides to form a gap.

そして、１対の保持爪９ａ、９ｂが左右に開くことになり、その隙間から電線２が保持爪９ａ、９ｂの貫通孔から出る。電線２が貫通孔から出ると、保持爪９ａ、９ｂは、両側から保持爪バネ１０ａ、１０ｂによって引き寄せられて閉じる。図４の例では、電線２は、ケース４の空間部３の奥の略円形部と、保持爪９ａ、９ｂで囲まれて固定されており、保持爪９ａ、９ｂは互い直接接触せず両者の間で隙間がある。更に、保持爪バネ１０ａ、１０ｂが保持爪９ａ、９ｂの両側から力を加え、押している。 Then, the pair of holding claws 9a and 9b open to the left and right, and the electric wire 2 exits from the through holes of the holding claws 9a and 9b through the gap. When the electric wire 2 comes out of the through hole, the holding claws 9a and 9b are attracted and closed by the holding claw springs 10a and 10b from both sides. In the example of FIG. 4, the electric wire 2 is fixed by being surrounded by a substantially circular portion at the back of the space 3 of the case 4 and the holding claws 9a and 9b, and the holding claws 9a and 9b are not in direct contact with each other. There is a gap between them. Further, the holding claw springs 10a and 10b apply force from both sides of the holding claws 9a and 9b to push them.

よって、電線２は空間部３内で移動することなく保持固定される。図４の例では、両者の間に形成される隙間である貫通孔の形状は略三角形の構造になっており、測定できる電線２の許容太さは、この貫通孔の大きさで決定される。即ち、保持爪９ａ、９ｂが接触したときのできる空間で、ケース４の空間部３の奥（底部）の略円形部と、保持爪９ａ、９ｂで囲まれた部分が電線２の最小外径を決定する。この最小外径より太い電線２を、保持爪９ａ、９ｂで保持する。 Therefore, the electric wire 2 is held and fixed without moving in the space 3. In the example of FIG. 4, the shape of the through hole, which is a gap formed between the two, has a substantially triangular structure, and the allowable thickness of the electric wire 2 that can be measured is determined by the size of the through hole. . That is, the space formed when the holding claws 9a and 9b come into contact with each other, and the portion surrounded by the substantially circular portion at the back (bottom) of the space portion 3 of the case 4 and the holding claws 9a and 9b is the minimum outer diameter of the electric wire 2. To decide. The electric wire 2 thicker than the minimum outer diameter is held by the holding claws 9a and 9b.

電線２の最大外径は、空間部３の大きさが決定する。本例のスライダバネ８ｃ、８ｄと保持爪バネ１０ａ、１０ｂは、コイルバネであるが他のバネであってもよく、例えば、板ばねであっても良い。図５は、磁性板７ｃにコイル２０を巻いた例を示す図である。コイル２０は、回路基板８に接続される。コイル２０は、図５に示すように、磁性板７ｃの中央部分の一部に巻かれているが、磁性板７ｃ全体に巻いたものであっても良い。 The maximum outer diameter of the electric wire 2 is determined by the size of the space portion 3. The slider springs 8c and 8d and the holding claw springs 10a and 10b in this example are coil springs, but may be other springs, for example, leaf springs. FIG. 5 is a diagram illustrating an example in which the coil 20 is wound around the magnetic plate 7c. The coil 20 is connected to the circuit board 8. As shown in FIG. 5, the coil 20 is wound around a part of the center portion of the magnetic plate 7c, but may be wound around the entire magnetic plate 7c.

［電流センサー１の機能、作用］
従来の磁気コア式電力センサーは、取り付け時、コアを分割し、電線を磁気コア内に入れていた。本実施の形態の電流センサー１の場合は、電流センサー１を電線２に押しつけ、磁気コア内に電線２を差し込むだけで良い。この電流センサー１は、電線２の横から差し込むための構造を有するので、計測する電力線へ取付けるとき固定する操作をすることもなくなり、電流センサー１を電線２に差し込むだけで取り付けが容易に行えるようになった。 [Function and function of current sensor 1]
When a conventional magnetic core type power sensor is attached, the core is divided and the electric wire is put in the magnetic core. In the case of the current sensor 1 of the present embodiment, it is only necessary to press the current sensor 1 against the electric wire 2 and insert the electric wire 2 into the magnetic core. Since this current sensor 1 has a structure for being inserted from the side of the electric wire 2, there is no need to perform the fixing operation when attaching to the power line to be measured, and the attachment can be easily performed simply by inserting the current sensor 1 into the electric wire 2. Became.

従来の磁気コア式電力センサーの機構と比べると、配線された電線２をそのままにした状態で、取付けと取外しすることができる。また、従来の磁気コア式電力センサーで、特に、分割できない磁気コアを備えたものは、電線を接続部から取り外すための作業が必要であり、電気工事の有資格者がその作業を行わなければならなかった。これに対して、本実施の形態の電流センサー１は、そのように配線工事が必要なく、電気工事の有資格者ではなくても、電流センサー１を電線２に設置、取り外しすることができる。 Compared with the mechanism of the conventional magnetic core type power sensor, it can be attached and detached while the wired electric wire 2 is left as it is. Also, conventional magnetic core type power sensors, especially those with a magnetic core that cannot be divided, require work to remove the electric wires from the connection part, unless a qualified electrician does the work. did not become. On the other hand, the current sensor 1 according to the present embodiment does not require wiring work as described above, and the current sensor 1 can be installed and removed from the electric wire 2 even if it is not a qualified person for electrical work.

言い換えると、本実施の形態の電流センサー１は、これを設置する者は、電力線に直接触れることなく取付けて測定できる。また、従来の磁気コア式電力センサーは、電線を磁気コア内に入れる際に開閉する時、磁気コアを半割して開いてその中に電線を入れてから、開いたコアを閉じるものもある。このコアを閉じるとき、互いに嵌合部の爪が破損することが問題となっていた。本発明の電流センサー１は、クリップ式の第１保持部６ａ、第２保持部６ｂを採用することにより、従来のように爪を有する構造ではないので破損防止ができ、取り扱い易く、信頼性の高い電流センサー１を提供できた。 In other words, the current sensor 1 according to the present embodiment can be installed and measured by a person installing it without directly touching the power line. In addition, when the conventional magnetic core type power sensor is opened and closed when the electric wire is put in the magnetic core, there is also a type in which the magnetic core is halved and opened, the electric wire is put therein, and then the opened core is closed. . When this core is closed, there is a problem that the claws of the fitting portion are damaged. The current sensor 1 according to the present invention employs the clip-type first holding portion 6a and the second holding portion 6b, so that it does not have a claw structure as in the prior art, so that it can be prevented from being damaged, easy to handle, and reliable. High current sensor 1 could be provided.

本実施の形態の電流センサー１は、保持部を有し、電線を磁気コアのＵ字部の底部の位置近傍で確実に保持する。従来の電力センサーは、電線を磁気コア内にはめ込み固定するとき、そのための操作が必要であったが、本実施の形態の場合は電流センサー１を電線２に押し込みするだけで良く、それ以外の操作が必要なくなった。また、本実施の形態の電流センサーは、空間部３を電線２に差し込むだけであるので、測定スペースが狭い電力線への取付けでも簡単にできるようになった。 The current sensor 1 according to the present embodiment has a holding portion and reliably holds the electric wire in the vicinity of the position of the bottom portion of the U-shaped portion of the magnetic core. The conventional power sensor requires an operation for fitting and fixing the electric wire in the magnetic core. However, in the case of the present embodiment, it is only necessary to push the current sensor 1 into the electric wire 2. No need to operate. Moreover, since the current sensor of the present embodiment only needs to insert the space 3 into the electric wire 2, it can be easily attached to a power line having a narrow measurement space.

また、一対の保持部６ａ、６ｂは、電流センサー１を電線に確実に固定し、特に磁性板７ｃが電線２と平行に確実に保持されるので、磁性板７ｃが電線２の位置関係が明確になり、センサー性能が向上する。よって、本例では、０．０３Ａ、３Ｗ程度の小電流からの電流量を計測することが可能になった。これは、従来のセンサーでなかった精度である。特に、空間部３の底部近傍に電力線を配置固定し、Ｕ字状の磁性板７ｃと電線２の位置関係が変化することがないので、このような高い精度が実現でき、電力線に流れる電流を安定して計測できる。 The pair of holding portions 6a and 6b securely fix the current sensor 1 to the electric wire, and in particular, the magnetic plate 7c is securely held in parallel with the electric wire 2, so that the magnetic plate 7c has a clear positional relationship with the electric wire 2. The sensor performance is improved. Therefore, in this example, it is possible to measure the amount of current from a small current of about 0.03 A and 3 W. This is an accuracy that was not possible with conventional sensors. In particular, since the power line is arranged and fixed near the bottom of the space 3 and the positional relationship between the U-shaped magnetic plate 7c and the electric wire 2 does not change, such high accuracy can be realized, and the current flowing through the power line can be reduced. It can be measured stably.

〔第２の実施の形態〕
次に、本発明の第２の実施の形態の電流センサー１１の概要を図６により説明する。電流センサー１１は、上述の第１の実施の形態の電流センサー１と基本的に同じ構造であるので、異なる部分のみを説明する。電流センサー１１は、第１の実施の形態の電流センサー１にあった磁性板７ａ、７ｂがなく、従って、スライダ８ａ、８ｂ、スライダバネ８ｃ、８ｄ、及びスライダ蓋８ｅ、８ｆを備えていない。 [Second Embodiment]
Next, the outline of the current sensor 11 according to the second embodiment of the present invention will be described with reference to FIG. Since the current sensor 11 has basically the same structure as the current sensor 1 of the first embodiment described above, only different parts will be described. The current sensor 11 does not have the magnetic plates 7a and 7b which are the same as those of the current sensor 1 of the first embodiment, and therefore does not include the sliders 8a and 8b, the slider springs 8c and 8d, and the slider lids 8e and 8f.

図６は、本発明の第２の実施の形態の電流センサー１１の検知部の断面を示す断面図である。電流センサー１１の検知部は、磁気回路のコアは磁性板１７ｃのみからなる。磁性板１７ｃは、略Ｕ字タイプである。磁性板１７ｃの終端は略平行の一対の支腕部である。磁性板１７ｃは、四角形の平面の磁性板を、折り曲げてその中心部を断面が略半円形にし、両端部は平行な支腕部にしている。 FIG. 6 is a cross-sectional view showing a cross section of the detection unit of the current sensor 11 according to the second embodiment of the present invention. In the detection unit of the current sensor 11, the core of the magnetic circuit is composed of only the magnetic plate 17c. The magnetic plate 17c is substantially U-shaped. The end of the magnetic plate 17c is a pair of substantially parallel support arms. The magnetic plate 17c is formed by bending a rectangular flat magnetic plate so that the central portion has a substantially semicircular cross section, and both end portions are parallel support arms.

〔第３の実施の形態〕
次に、本発明の第３の実施の形態の電流センサー１２の概要を図７により説明する。電流センサー１２は、上述の第１又は第２の実施の形態の電流センサーと基本的に同じ構造であるので、異なる部分のみを説明する。本発明の電流センサー１２は、第１、２の実施の形態の電流センサー１にあった保持機構が異なる構造である。電流センサー１２の保持機構は、同じ構造と機能を有する第１保持部と第２保持部からなるので、第１保持部のみを例に説明する。 [Third Embodiment]
Next, the outline of the current sensor 12 according to the third embodiment of the present invention will be described with reference to FIG. Since the current sensor 12 has basically the same structure as the current sensor of the first or second embodiment described above, only different parts will be described. The current sensor 12 of the present invention has a structure in which the holding mechanism that is the same as the current sensor 1 of the first and second embodiments is different. Since the holding mechanism of the current sensor 12 includes a first holding unit and a second holding unit having the same structure and function, only the first holding unit will be described as an example.

図７は、本発明の第３の実施の形態の電流センサー１２の第１保持部の概要を示す概念図である。電流センサー１２の第１保持部は、電線２を保持するために、揺動型の保持爪１９ａ、１９ｂと、保持爪バネ１０ａ、１０ｂからなる。保持爪１９ａ、１９ｂは、本例では、両方とも同じ肉厚を有する板状のものであり、ケース本体４ｃの空間部３の上部に配置されている。保持爪１９ａ、１９ｂの一端部はそれぞれ孔を有し、この穴が空間部３の底部側で、ケース本体４ｃに固定されたピン１８ａ、１８ｂに揺動自在に支持されている。 FIG. 7 is a conceptual diagram showing an outline of the first holding unit of the current sensor 12 according to the third embodiment of the present invention. In order to hold the electric wire 2, the first holding portion of the current sensor 12 includes swing-type holding claws 19 a and 19 b and holding claw springs 10 a and 10 b. In this example, the holding claws 19a and 19b are both plate-shaped having the same thickness, and are arranged on the upper portion of the space 3 of the case body 4c. One end of each of the holding claws 19a and 19b has a hole, and this hole is supported on the bottom side of the space 3 by pins 18a and 18b fixed to the case body 4c so as to be swingable.

よって、保持爪１９ａ、１９ｂは、このピン１８ａ、１８ｂを軸にして、ケース本体４ｃ上で揺動可能である。この揺動方向は、ケース本体４ｃの壁方向である。保持爪バネ１０ａ、１０ｂの１端は、ケース本体４ｃに接しており、保持爪バネ１０ａ、１０ｂの他端は、保持爪１９ａ、１９ｂの止まり穴に係合又は固定される。従って、保持爪１９ａ、１９ｂは、保持爪バネ１０ａ、１０ｂのバネ力で常時閉じる方向に付勢されている。この構造により、電線２を差し込むと、この押し込みするときの力の分力により、保持爪１９ａ、１９ｂが両側へ揺動して開き、保持爪バネ１０ａ、１０ｂが圧縮され、保持爪１９ａ、１９ｂを互いに閉じるための力が蓄えられる。 Therefore, the holding claws 19a and 19b can swing on the case body 4c around the pins 18a and 18b. This swinging direction is the wall direction of the case body 4c. One ends of the holding claw springs 10a and 10b are in contact with the case body 4c, and the other ends of the holding claw springs 10a and 10b are engaged or fixed in blind holes of the holding claws 19a and 19b. Accordingly, the holding claws 19a and 19b are urged in a direction to be always closed by the spring force of the holding claw springs 10a and 10b. With this structure, when the electric wire 2 is inserted, the holding claws 19a, 19b swing and open to both sides due to the component force of the pushing, the holding claw springs 10a, 10b are compressed, and the holding claws 19a, 19b The power to close each other is stored.

１対の保持爪１９ａ、１９ｂが閉じたとき、その中央部に三角形状の貫通孔が形成され、この貫通孔に入った電線２を両側から挟んで保持する。また、電線２が保持爪１９ａ、１９ｂの貫通孔から出るときに、電線２が保持爪１９ａ、１９ｂの傾斜面に接触し、更に力を加えて電線２を引っ張ると、引っ張るときの力の分力により、１対の保持爪１９ａ、１９ｂは、両側へ揺動して開き隙間ができる。そして、１対の保持爪１９ａ、１９ｂが左右に開くことになり、その隙間から電線２が保持爪９ａ、９ｂの貫通孔から出る。電線２が貫通孔から出ると、保持爪１９ａ、１９ｂは、両側から保持爪バネ１０ａ、１０ｂによって引き寄せられて閉じる。 When the pair of holding claws 19a and 19b are closed, a triangular through hole is formed at the center thereof, and the electric wire 2 that has entered the through hole is held between both sides. Further, when the electric wire 2 comes out of the through holes of the holding claws 19a and 19b, the electric wire 2 comes into contact with the inclined surfaces of the holding claws 19a and 19b and further pulls the electric wire 2 by applying a force. Due to the force, the pair of holding claws 19a and 19b swing to both sides to form an opening gap. Then, the pair of holding claws 19a and 19b open to the left and right, and the electric wire 2 comes out of the through holes of the holding claws 9a and 9b through the gap. When the electric wire 2 comes out of the through hole, the holding claws 19a and 19b are attracted and closed by the holding claw springs 10a and 10b from both sides.

〔その他〕
上述のように、第１〜第３の実施の形態において、空間部３の奥部はＵ字形をしているが、三角形、略三角形等の多角形、楕円形等の形状であっても良い。磁性板７ａと磁性板７ｂが互いに突き当たって接触している端部は、前述したものは平坦な面であるが、凹部と凸部を形成して、凸部を凹部に挿入する嵌め込み式の構造にしたものでも良い。磁性材の面接触部を凹部と凸部にする理由は、接触面積を増加させて、嵌合部の磁束を安定させることであり、電流センサーの精度を向上させるためである。また、凹部と凸部により、嵌合強度が向上するため、衝撃や振動等に強くなり、接触面のずれを予防できる。 [Others]
As described above, in the first to third embodiments, the inner part of the space 3 is U-shaped, but may be a polygon such as a triangle or a substantially triangle, or a shape such as an ellipse. . The end portion where the magnetic plate 7a and the magnetic plate 7b are in contact with each other is in contact with each other. The above-described end portion is a flat surface, but a recess-and-projection portion is formed, and the projection-type structure is inserted into the recess portion. It may be the one made. The reason why the surface contact portion of the magnetic material is the concave portion and the convex portion is to increase the contact area and stabilize the magnetic flux of the fitting portion, and to improve the accuracy of the current sensor. Moreover, since the fitting strength is improved by the concave portion and the convex portion, the concave portion and the convex portion are strong against impact, vibration, and the like, and the displacement of the contact surface can be prevented.

１…電流センサー
２…電線
３…空間部
５…検知部
４…ケース
４ａ…ケース蓋
４ｂ…ケース底
５…検知部
６ａ…第１保持部、６ｂ…第２保持部
７ａ、７ｂ、７ｃ…磁性板
８ａ、８ｂ…スライダ
８ｃ、８ｄ…スライダバネ
８ｅ、８ｆ…スライダ蓋
９ａ、９ｂ…保持爪
１０ａ、１０ｂ…保持爪バネ
２０…検知コイル DESCRIPTION OF SYMBOLS 1 ... Current sensor 2 ... Electric wire 3 ... Space part 5 ... Detection part 4 ... Case 4a ... Case lid 4b ... Case bottom 5 ... Detection part 6a ... 1st holding part, 6b ... 2nd holding part 7a, 7b, 7c ... Magnetic Plate 8a, 8b ... Slider 8c, 8d ... Slider spring 8e, 8f ... Slider lid 9a, 9b ... Holding claw 10a, 10b ... Holding claw spring 20 ... Detection coil

Claims

The body,
Provided in the main body, comprising a core made of a magnetic material, a coil wound around the core or a detection unit consisting of a detection element for detecting magnetic flux, and a holding unit for detachably holding and fixing the conductor to be measured,
A current sensor for holding the measured conductor in the holding unit and measuring the current or power flowing through the measured conductor based on a change in magnetic flux generated by the current flowing through the measured conductor in the detection unit In
The holding part is disposed in the main body, and is arranged in the vicinity of the detection part, and a first holding part and a second holding part for fixing the measured conductor by sandwiching the measured conductor from both sides. A current sensor comprising: a holding portion.

The body,
A core provided with the fixed magnetic material and a movable magnetic material, a coil wound around the fixed magnetic material, a detection unit consisting of a detection element for detecting magnetic flux, and a conductor to be measured are sandwiched between the core and the measurement subject. It has a holding part for fixing,
A current sensor for holding the measured conductor in the holding unit and measuring the current or power flowing through the measured conductor based on a change in magnetic flux generated by the current flowing through the measured conductor in the detection unit In
The movable magnetic material comprises a first movable magnetic material and a second movable magnetic material,
The first movable magnetic material and the second movable magnetic material move in the body, respectively.
When measuring the current sensor, the first movable magnetic material, the fixed magnetic material, and the second movable magnetic material are in contact with each other to form a closed magnetic circuit surrounding the conductor to be measured. Characteristic current sensor.

In claim 1,
The first holding portion includes a first holding claw and a second holding claw that are moved in the main body and are urged by a first spring and a second spring in a direction to hold the conductor to be measured, The first holding claw and the second holding claw sandwich and fix the measured conductor from both sides with the spring pressure of the first spring and the second spring,
The second holding portion includes a third holding claw and a fourth holding claw that are moved in the main body and are urged by a third spring and a fourth spring, respectively, in a direction to hold the conductor to be measured. The current sensor, wherein the third holding claw and the fourth holding claw sandwich and hold the conductor to be measured from both sides by the spring pressure of the third spring and the fourth spring.

The current sensor according to claim 2,
The first movable magnetic material is mounted on a first slider that moves within the main body, and is biased by a spring pressure of a fifth spring in the detection unit measurement position direction,
The second movable magnetic material is mounted on a second slider that moves the main body, and is biased by the spring pressure of a sixth spring in the measurement position direction of the detection unit.

The current sensor according to claim 1 or 2,
The current sensor characterized in that the detection unit forms a measurement space having a U-shaped cross-section, and the measurement conductor enters the measurement space.

The current sensor according to claim 3.
The current sensor, wherein the first holding claw, the second holding claw, the third holding claw, and the fourth holding claw are swing-type holding claws that can swing in the main body.

The current sensor according to claim 2,
The contact surface of the first movable magnetic material and the second movable magnetic material is formed with a concave portion and a convex portion that are inserted and fitted to each other.