JP2009258048A - Current sensor - Google Patents

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JP2009258048A
JP2009258048A JP2008110213A JP2008110213A JP2009258048A JP 2009258048 A JP2009258048 A JP 2009258048A JP 2008110213 A JP2008110213 A JP 2008110213A JP 2008110213 A JP2008110213 A JP 2008110213A JP 2009258048 A JP2009258048 A JP 2009258048A
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hole
connector
current sensor
conductor
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JP5107779B2 (en
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Emi Kageyama
絵未 蔭山
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Yazaki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a current sensor which enhances manufacturing efficiency and assembling efficiency. <P>SOLUTION: A shield 6 which is arranged at circumference of Z axis of a wire 2 is partitioned into two at X axis direction. Each of partitioned shields 61, 62 is arranged at the similar shape mutually so as to become line symmetry by setting a straight line L1 in alignment with X axis as axis of symmetry. A housing case 7 which holds the shield 6 is prepared so that a connector 5 may be project in accordance with Z axis direction from a connector through-hole 73. The housing case 7 is prepared so that the connector through-hole 73 and a wire through-hole 74 may be partitioned along X axis. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電流センサに係り、特に、電流が流れる導体と、前記導体の長手方向を軸として軸周りを囲むように配置されたシールド板と、前記導体に電流が流れたときに発生する磁界の磁束密度を検出して電気信号に変換する磁電変換素子と、を有する電流センサに関するものである。   The present invention relates to a current sensor, and in particular, a conductor through which a current flows, a shield plate disposed so as to surround the axis around the longitudinal direction of the conductor, and a magnetic field generated when a current flows through the conductor. The present invention relates to a current sensor having a magnetoelectric conversion element that detects and converts the magnetic flux density into an electric signal.

上述した電流センサとして、例えば図８に示すようなものが一般的に知られている（例えば特許文献１〜４）。同図に示すように、電流センサ１０は、電流が流れる電線２（導体）と、電線２の長手方向を軸として軸周りを囲むように配置された環状の収容ケース７と、を有している。上記収容ケース７内には、電線２の長手方向を軸として軸周りを囲むように配置された環状のコア（図示せず）と、コアのギャップ内に配置された磁電変換素子としてのホール素子（図示せず）と、が収容されている。収容ケース７は、その中央に電線２を貫通して保持する電線貫通孔７４（導体貫通孔）が設けられている。   As the above-described current sensor, for example, the one shown in FIG. 8 is generally known (for example, Patent Documents 1 to 4). As shown in the figure, the current sensor 10 has an electric wire 2 (conductor) through which an electric current flows, and an annular housing case 7 arranged so as to surround the axis around the longitudinal direction of the electric wire 2 as an axis. Yes. In the housing case 7, an annular core (not shown) arranged so as to surround the axis around the longitudinal direction of the electric wire 2, and a hall element as a magnetoelectric conversion element arranged in the gap of the core (Not shown). The housing case 7 is provided with an electric wire through hole 74 (conductor through hole) for penetrating and holding the electric wire 2 at the center thereof.

上述した構成の電流センサ１０は、電線２に電流が流れるとその電流に応じた磁束密度の磁界が発生する。ホール素子は、コアにより収束された磁界の磁束密度を電気信号に変換して、電流に応じた信号として出力する。また、コアは、外部からの磁界の影響をシールドする機能も有している。しかしながら、上記電線２の端部にかしめられる端子部Ｔは大きいものが多く、この端子部Ｔを収容ケース７中央に設けた電線貫通孔７４に通すことができない。このため、上述した電流センサ１０は、収容ケース７の電線貫通孔７４に電線２を通した後に、電線２の端部に端子部Ｔをかしめる必要があり、電線２の収容ケース７に対する取り付けが非常に煩雑であった。   In the current sensor 10 having the above-described configuration, when a current flows through the electric wire 2, a magnetic field having a magnetic flux density corresponding to the current is generated. The Hall element converts the magnetic flux density of the magnetic field converged by the core into an electric signal and outputs it as a signal corresponding to the current. The core also has a function of shielding the influence of an external magnetic field. However, the terminal portion T that is crimped to the end portion of the electric wire 2 is often large, and the terminal portion T cannot be passed through the electric wire through hole 74 provided in the center of the housing case 7. For this reason, the above-described current sensor 10 needs to crimp the terminal portion T to the end of the electric wire 2 after passing the electric wire 2 through the electric wire through hole 74 of the accommodating case 7, and the electric wire 2 is attached to the accommodating case 7. Was very cumbersome.

このような問題を解決するために、コア又はケースを分割する電流センサが提案されている（特許文献５、６）。この電流センサによれば、電線の端部に端子部をかしめた状態でコア又はケースに取り付けることができる。しかしながら、上述した電流センサは、コア又はケースを複数のパーツに分割している。このため、１つのコア又はケースを構成する複数のパーツを別々の製造工程で製造した後に組み立てる必要があり、製造効率、組み付け効率が悪い、という問題があった。
特開２００１−６６３２８号公報 特開２００６−７８２５５号公報 特開２００５−３０８５２７号公報 特開２００３−１２１４７６号公報 特開平９−２９２４１３号公報 特開２００１−８３１８４号公報 In order to solve such a problem, a current sensor that divides a core or a case has been proposed (Patent Documents 5 and 6). According to this current sensor, it can be attached to the core or the case with the terminal portion crimped to the end portion of the electric wire. However, the current sensor described above divides the core or case into a plurality of parts. For this reason, it is necessary to assemble a plurality of parts constituting one core or case in different manufacturing processes, and there is a problem that manufacturing efficiency and assembly efficiency are poor.
JP 2001-66328 A JP 2006-78255 A JP 2005-308527 A JP 2003-121476 A JP-A-9-292413 JP 2001-83184 A

そこで、本発明は、上記のような問題点に着目し、製造効率及び組み付け効率の向上を図った電流センサを提供することを課題とする。   Accordingly, the present invention focuses on the above-described problems, and an object thereof is to provide a current sensor that improves manufacturing efficiency and assembly efficiency.

上記課題を解決するためになされた請求項１記載の発明は、電流が流れる導体と、前記導体の長手方向を軸として軸周りを囲むように配置された前記長手方向と直交する分割方向に２分割されたシールド板と、前記導体に電流が流れたときに発生する磁界の磁束密度を検出して電気信号に変換する磁電変換素子と、を有する電流センサにおいて、前記シールド板が、前記２分割された各々が互いに同一形状となり、かつ、前記２分割された各々が前記分割方向に沿った直線を対称軸として線対称となるように、設けられたことを特徴とする電流センサに存する。   The invention according to claim 1, which has been made to solve the above-mentioned problems, includes a conductor through which an electric current flows and a dividing direction orthogonal to the longitudinal direction arranged so as to surround the axis around the longitudinal direction of the conductor. A current sensor comprising: a divided shield plate; and a magnetoelectric conversion element that detects a magnetic flux density of a magnetic field generated when a current flows through the conductor and converts the magnetic signal into an electric signal. The current sensor is provided so that each of the two parts has the same shape, and each of the two divided parts is line-symmetrical with respect to a straight line along the dividing direction.

請求項２記載の発明は、前記導体が貫通する導体貫通孔を分割するように前記分割方向に分割された前記シールド板を収容する収容ケースと、前記磁電変換素子に電気的に接続されたコネクタと、を有する電流センサであって、前記磁電変換素子が、前記シールド板に囲まれた空間に配置されるように設けられ、前記コネクタが、前記収容ケースに設けたコネクタ貫通孔から前記長手方向に沿って突出するように設けられ、そして、前記収容ケースが、前記コネクタ貫通孔を分割するように設けられたことを特徴とする請求項１に記載の電流センサに存する。   According to a second aspect of the present invention, there is provided a housing case for housing the shield plate divided in the dividing direction so as to divide a conductor through hole through which the conductor passes, and a connector electrically connected to the magnetoelectric transducer The magnetoelectric conversion element is provided so as to be disposed in a space surrounded by the shield plate, and the connector extends from a connector through-hole provided in the housing case in the longitudinal direction. The current sensor according to claim 1, wherein the housing case is provided so as to divide the connector through hole.

請求項３記載の発明は、前記収容ケースを構成する一対の分割ケース同士を係止するための一対の係止手段が、前記導体貫通孔及び前記コネクタ貫通孔を挟むように前記一対の分割ケースの各々に設けられ、そして、前記導体貫通孔が、前記一対の係止手段のうちの前記コネクタ貫通孔とは反対側の係止手段に最も近づけて設けられたことを特徴とする請求項２に記載の電流センサに存する。   According to a third aspect of the present invention, the pair of split cases is configured such that a pair of locking means for locking the pair of split cases constituting the housing case sandwich the conductor through hole and the connector through hole. And the conductor through-hole is provided closest to the locking means on the opposite side of the connector through-hole of the pair of locking means. In the current sensor.

請求項４記載の発明は、前記磁電変換素子が、予め測定された前記導体と前記シールド板との間において前記導体に電流が流れたときに発生する磁界の磁束密度の変化が最小となる位置に配置されていることを特徴とする請求項１〜３何れか１項に記載の電流センサに存する。   According to a fourth aspect of the present invention, the magnetoelectric conversion element is a position where a change in magnetic flux density of a magnetic field generated when a current flows between the conductor and the shield plate measured in advance is minimized. The current sensor according to any one of claims 1 to 3, wherein the current sensor is disposed in a position.

以上説明したように請求項１記載の発明によれば、シールド板が、２分割された各々が同一形状となり、かつ、２分割された各々が分割方向及び長手方向の両方に直交する方向に対称となるように、設けられているので、２分割した各々を同じ製造工程で製造することができる。また、２分割された各々の分割方向及び長手方向の両方に直交する方向の配置を気にする必要がない。これにより、製造効率及び組み付け効率の向上を図ることができる。   As described above, according to the first aspect of the present invention, each of the two divided shield plates has the same shape, and each of the two divided plates is symmetrical in the direction perpendicular to both the dividing direction and the longitudinal direction. Therefore, each of the two parts can be manufactured in the same manufacturing process. Further, there is no need to worry about the arrangement in the direction perpendicular to both the dividing direction and the longitudinal direction of each of the two divided parts. Thereby, the improvement of manufacturing efficiency and assembly | attachment efficiency can be aimed at.

請求項２記載の発明によれば、コネクタが、収容ケースに設けたコネクタ貫通孔から長手方向に沿って突出するように設けられ、そして、収容ケースが、コネクタ貫通孔を分割するように設けられているので、磁気変換素子をシールド板に囲まれた空間に配置しても簡単にコネクタを収容ケースから突出するように収容ケースに取り付けることができる。   According to the second aspect of the present invention, the connector is provided so as to protrude along the longitudinal direction from the connector through-hole provided in the housing case, and the housing case is provided so as to divide the connector through-hole. Therefore, even if the magnetic conversion element is disposed in the space surrounded by the shield plate, the connector can be easily attached to the housing case so as to protrude from the housing case.

請求項３記載の発明によれば、導体貫通孔が、一対の係止手段のうちのコネクタ貫通孔とは反対側の係止手段に最も近づけて設けられているので、導体を可能な限りシールド板に近づけて設けることができる。これにより、収容ケースの伸縮や振動などにより、磁電変換素子の配置位置が変動しても誤差を小さく抑えることができ、精度良く電流を測定することができる。   According to the invention of claim 3, since the conductor through hole is provided closest to the locking means on the side opposite to the connector through hole of the pair of locking means, the conductor is shielded as much as possible. It can be provided close to the plate. Thereby, even if the arrangement position of the magnetoelectric transducer varies due to expansion / contraction or vibration of the housing case, the error can be kept small, and the current can be measured with high accuracy.

請求項４記載の発明によれば、磁電変換素子が、予め測定された導体とシールド板との間において導体に電流が流れたときに発生する磁界の磁束密度の変化が最小となる位置に配置されているので、磁束密度の変化が平坦な位置に磁電変換素子を配置できるため、ガタツキによる測定誤差を小さくすることができる。   According to the invention of claim 4, the magnetoelectric conversion element is disposed at a position where the change in the magnetic flux density of the magnetic field generated when a current flows between the conductor and the shield plate measured in advance is minimized. Therefore, since the magnetoelectric conversion element can be arranged at a position where the change of the magnetic flux density is flat, the measurement error due to the backlash can be reduced.

以下、本発明の実施形態を図１〜図４に基づいて説明する。図１などに示すように、本発明の電流センサ１は、導体としての電線２と、磁電変換素子としてのホールＩＣ３と、回路基板４と、コネクタ５と、シールド板としてのシールド６と、収容ケース７と、を備えている。電線２は、電流が流れる芯線とこの芯線を覆う被覆部とから構成された被覆電線である。ホールＩＣ３は、電線２に電流が流れたときに発生する磁界の磁束密度を検出して電気信号に変換する。ホールＩＣ３は、回路基板４上に搭載される。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. As shown in FIG. 1 and the like, the current sensor 1 of the present invention includes an electric wire 2 as a conductor, a Hall IC 3 as a magnetoelectric conversion element, a circuit board 4, a connector 5, a shield 6 as a shield plate, and a housing. And a case 7. The electric wire 2 is a covered electric wire composed of a core wire through which a current flows and a covering portion that covers the core wire. The Hall IC 3 detects the magnetic flux density of a magnetic field generated when a current flows through the electric wire 2 and converts it into an electric signal. The Hall IC 3 is mounted on the circuit board 4.

回路基板４は、平板状に形成されている。回路基板４は、その表面にホールＩＣ３の端子と、後述するコネクタ５と、を接続するための図示しない導電パターンが形成されている。コネクタ５は、図示しない電源供給端子及び出力端子と、これら端子を収容するコネクタハウジング５１と、から構成されている。電源供給端子は、ホールＩＣ３への電源を供給するための端子である。出力端子は、ホールＩＣ３からの電気信号を出力するための端子である。電源供給端子及び出力端子は、一端が上記回路基板４を介してホールＩＣ３に電気的に接続され、他端がコネクタハウジング５１の開口から露出するように設けられている。   The circuit board 4 is formed in a flat plate shape. On the surface of the circuit board 4, a conductive pattern (not shown) for connecting the terminals of the Hall IC 3 and a connector 5 described later is formed. The connector 5 includes a power supply terminal and an output terminal (not shown) and a connector housing 51 that accommodates these terminals. The power supply terminal is a terminal for supplying power to the Hall IC 3. The output terminal is a terminal for outputting an electrical signal from the Hall IC 3. The power supply terminal and the output terminal are provided such that one end is electrically connected to the Hall IC 3 through the circuit board 4 and the other end is exposed from the opening of the connector housing 51.

コネクタハウジング５１は、図２に示すように、筒状に形成されていて、搭載部５１１と、コネクタ部５１２と、ケース嵌合溝５１３と、から構成されている。搭載部５１１は、回路基板４上に搭載されている。コネクタ部５１２は、図１に示すように、後述する収容ケース７のコネクタ貫通孔７３（図２）から突出して相手側コネクタとコネクタ接続する。ケース嵌合溝５１３は、搭載部５１１−コネクタ部５１２間に設けられ、後述する収容ケース７のコネクタ貫通孔７３の縁部と嵌合する。   As illustrated in FIG. 2, the connector housing 51 is formed in a cylindrical shape, and includes a mounting portion 511, a connector portion 512, and a case fitting groove 513. The mounting portion 511 is mounted on the circuit board 4. As shown in FIG. 1, the connector 512 protrudes from a connector through hole 73 (FIG. 2) of the housing case 7 to be described later and is connected to the mating connector. The case fitting groove 513 is provided between the mounting portion 511 and the connector portion 512, and fits with an edge portion of a connector through hole 73 of the housing case 7 described later.

シールド６は、電線２の長手方向であるＺ軸の周りを囲むように配置される。シールド６は、断面略矩形状の環状に形成されていて、Ｚ軸方向（長手方向）と直交するＸ軸方向（分割方向）に２分割された一対の分割シールド６１、６２から構成されている。一対の分割シールド６１、６２は各々、コの字型に設けられると共に互いに同一形状に設けられている。一対の分割シールド６１、６２は、図３に示すように、Ｘ軸方向に沿った直線Ｌ１を対称軸とした線対称に形成されている。また、シールド６は、Ｘ軸、Ｚ軸の両方に直交するＹ軸方向に対向する一対のギャップＧ１、Ｇ２が設けられている。   The shield 6 is disposed so as to surround the Z axis that is the longitudinal direction of the electric wire 2. The shield 6 is formed in an annular shape having a substantially rectangular cross section, and includes a pair of split shields 61 and 62 that are divided into two in the X-axis direction (division direction) orthogonal to the Z-axis direction (longitudinal direction). . The pair of split shields 61 and 62 are provided in a U-shape and are provided in the same shape. As shown in FIG. 3, the pair of split shields 61 and 62 are formed in line symmetry with a straight line L1 along the X-axis direction as a symmetry axis. In addition, the shield 6 is provided with a pair of gaps G1 and G2 that face each other in the Y-axis direction orthogonal to both the X-axis and the Z-axis.

収容ケース７は、樹脂などの絶縁部材で箱型に設けられている。図２に示すように、収容ケース７のＺ軸方向に対向する一対の面にはそれぞれ、電線２が貫通する一対の電線貫通孔７４が設けられている。また、収容ケース７のＺ軸方向に対向する一対の面の一方には、コネクタ５が貫通して突出されるコネクタ貫通孔７３が設けられている。上記コネクタ貫通孔７３及び電線貫通孔７４は、Ｙ軸方向に沿って並んで設けられている。収容ケース７は、シールド６と同様にＸ軸方向（分割方向）に２分割された一対の分割ケース７１、７２から構成されている。   The housing case 7 is provided in a box shape with an insulating member such as resin. As shown in FIG. 2, a pair of electric wire through-holes 74 through which the electric wire 2 penetrates is provided on each of the pair of surfaces facing the Z-axis direction of the housing case 7. In addition, a connector through hole 73 through which the connector 5 protrudes is provided on one of the pair of surfaces facing the Z-axis direction of the housing case 7. The connector through hole 73 and the wire through hole 74 are provided side by side along the Y-axis direction. Similar to the shield 6, the housing case 7 is composed of a pair of split cases 71 and 72 that are split in the X-axis direction (split direction).

上記一対の分割ケース７１、７２はそれぞれ、図２及び図４に示すように、受皿状に設けられている。一対の分割ケース７１、７２は、上記電線貫通孔７４及びコネクタ貫通孔７３がＸ軸方向に分割されるように設けられている。分割ケース７１には、コネクタ貫通孔７３及び電線貫通孔７４を挟むようにＹ軸方向に並んで配置された一対の係止凸部７５（＝係止手段）が設けられている。また、分割ケース７１には、一対の突出部７６と、この突出部７６に設けられた一対の係止孔７７と、が設けられている。一対の突出部７６は、分割ケース７１のＺ軸方向に対向する一対の面のうちコネクタ貫通孔７３が設けられていない面に設けられている。一対の突出部７６は、分割ケース７２に向かって突出して設けられ、Ｙ軸方向に並んで配置されている。   The pair of split cases 71 and 72 are each provided in a tray shape as shown in FIGS. 2 and 4. The pair of split cases 71 and 72 are provided so that the wire through hole 74 and the connector through hole 73 are divided in the X-axis direction. The split case 71 is provided with a pair of locking projections 75 (= locking means) arranged side by side in the Y-axis direction so as to sandwich the connector through hole 73 and the wire through hole 74. In addition, the split case 71 is provided with a pair of protrusions 76 and a pair of locking holes 77 provided in the protrusions 76. The pair of projecting portions 76 are provided on the surface of the split case 71 where the connector through hole 73 is not provided, of the pair of surfaces facing in the Z-axis direction. The pair of protrusions 76 are provided so as to protrude toward the split case 72 and are arranged side by side in the Y-axis direction.

一方、分割ケース７２には、図２に示すように、一対の突出部７８（＝係止手段）と、一対の突出部７８に設けた一対の係止孔７９と、が設けられている。一対の突出部７８は、分割ケース７２のコネクタ貫通孔７３及び電線貫通孔７４を挟むようにＹ軸方向に並んで配置されている。一対の突出部７８は、分割ケース７１に向かって突出して設けられ、Ｙ軸方向に沿って配置されている。一対の係止孔７９は、分割ケース７１に設けた一対の係止凸部７５と係止するように設けられている。また、分割ケース７２には、Ｚ軸方向に対向する一対の面のうちコネクタ貫通孔７３が設けられていない面にＹ軸方向に並んで配置された一対の係止凸部（図示せず）が設けられている。この図示しない一対の係止凸部は、分割ケース７１に設けた係止孔７７と係止するように設けられている。   On the other hand, as shown in FIG. 2, the split case 72 is provided with a pair of protrusions 78 (= locking means) and a pair of locking holes 79 provided in the pair of protrusions 78. The pair of projecting portions 78 are arranged side by side in the Y-axis direction so as to sandwich the connector through hole 73 and the wire through hole 74 of the split case 72. The pair of projecting portions 78 are provided so as to project toward the split case 71 and are disposed along the Y-axis direction. The pair of locking holes 79 are provided so as to lock with the pair of locking projections 75 provided in the split case 71. The split case 72 has a pair of locking projections (not shown) arranged side by side in the Y-axis direction on a surface where the connector through hole 73 is not provided among the pair of surfaces facing the Z-axis direction. Is provided. The pair of locking projections (not shown) are provided so as to lock with locking holes 77 provided in the split case 71.

また、図４に示すように、分割ケース７１、７２にはそれぞれ、基板支持溝８０と、シールド固定ピン８１と、が設けられている。基板支持溝８０は、分割ケース７１、７２のＺ軸方向に対向する内面にＸ軸方向に沿って設けられている。シールド固定ピン８１は、分割ケース７１、７２の内面にＹ軸方向に突出して設けられていて、図３に示すように、上記分割シールド６１、６２のギャップＧ１、Ｇ２の端面と嵌合する。   As shown in FIG. 4, each of the divided cases 71 and 72 is provided with a substrate support groove 80 and a shield fixing pin 81. The substrate support groove 80 is provided along the X-axis direction on the inner surfaces of the split cases 71 and 72 facing the Z-axis direction. The shield fixing pins 81 are provided on the inner surfaces of the split cases 71 and 72 so as to protrude in the Y-axis direction, and fit with the end faces of the gaps G1 and G2 of the split shields 61 and 62 as shown in FIG.

次に、上述した構成の電流センサ１の組み立て手順について説明する。まず、分割ケース７１のシールド固定ピン８１に分割シールド６１のギャップＧ１、Ｇ２の端面を嵌合させて、分割ケース７１に分割シールド６１を取り付ける。同様に、分割ケース７２のシールド固定ピン８１に分割シールド６２のギャップＧ１、Ｇ２の端面を嵌合させて、分割ケース７２に分割シールド６２を取り付ける。次に、分割ケース７１と分割ケース７２とをＸ軸方向に沿って互いに近づけて、分割ケース７１の係止凸部７５と分割ケース７２の係止孔７９とを係止させると共に分割ケース７１の係止孔７７と分割ケース７２の図示しない係止凸部とを係止させて、分割ケース７１と分割ケース７２とを固定する。このとき、分割ケース７１、７２にそれぞれ設けた電線貫通孔７４間に電線２を挟んで電線２を保持する。これにより、電線２のＺ軸周りをシールド６が囲むように配置される。   Next, a procedure for assembling the current sensor 1 having the above-described configuration will be described. First, the split shield 61 is attached to the split case 71 by fitting the end faces of the gaps G <b> 1 and G <b> 2 of the split shield 61 to the shield fixing pin 81 of the split case 71. Similarly, the split shield 62 is attached to the split case 72 by fitting the end faces of the gaps G1 and G2 of the split shield 62 to the shield fixing pins 81 of the split case 72. Next, the split case 71 and the split case 72 are brought close to each other along the X-axis direction to lock the locking projection 75 of the split case 71 and the locking hole 79 of the split case 72 and the split case 71. The split case 71 and the split case 72 are fixed by locking the lock hole 77 and a lock projection (not shown) of the split case 72. At this time, the electric wire 2 is held with the electric wire 2 sandwiched between the electric wire through holes 74 provided in the split cases 71 and 72, respectively. Thereby, it arrange | positions so that the shield 6 may surround the Z-axis periphery of the electric wire 2. FIG.

また、分割ケース７１、７２に設けた基板支持溝８０内に回路基板４を差し込むようにすると共に分割ケース７１、７２に設けたコネクタ貫通孔７３の縁部をコネクタ５に設けたケース嵌合溝５１３に差し込むようにして、収容ケース７に回路基板４及びこれに接続されたコネクタ５を取り付ける。これにより、シールド６に囲まれた空間にホールＩＣ３が配置される。   A case fitting groove in which the circuit board 4 is inserted into the board support groove 80 provided in the split cases 71 and 72 and the edge of the connector through hole 73 provided in the split cases 71 and 72 is provided in the connector 5. The circuit board 4 and the connector 5 connected thereto are attached to the housing case 7 so as to be inserted into the storage case 513. Thereby, the Hall IC 3 is arranged in the space surrounded by the shield 6.

上述した電流センサ１によれば、２分割された分割シールド６１、６２の各々が互いに同一形状となり、かつ、２分割された分割シールド６１、６２の各々がＸ軸（分割方向）に沿った直線Ｌ１を対称軸として線対称となるように、シールド６が設けられている。これにより、分割シールド６１、６２を同じ製造工程で製造することができる。また、分割シールド６１、６２のＹ軸方向の両端をひっくり返しても同じ形状であるため、Ｙ軸方向の配置を気にする必要がない。これにより、製造効率及び組み付け効率の向上を図ることができる。   According to the current sensor 1 described above, each of the two divided shields 61 and 62 has the same shape, and each of the two divided shields 61 and 62 is a straight line along the X axis (dividing direction). The shield 6 is provided so as to be line symmetric with respect to L1 as an axis of symmetry. Thereby, the division | segmentation shields 61 and 62 can be manufactured in the same manufacturing process. In addition, even if the both ends of the split shields 61 and 62 in the Y-axis direction are turned over, the shape is the same, so there is no need to worry about the arrangement in the Y-axis direction. Thereby, the improvement of manufacturing efficiency and assembly | attachment efficiency can be aimed at.

また、上述した電流センサ１によれば、コネクタ５が、収容ケース７に設けたコネクタ貫通孔７３からＺ軸方向に沿って突出するように設けられ、そして、収容ケース７が、コネクタ貫通孔７３を分割するように設けられている。これにより、ホールＩＣ３をシールド６に囲まれた空間に配置しても簡単にコネクタ５を収容ケース７から突出するように収容ケース７に取り付けることができる。また、コネクタ貫通孔７３以外の部分については分割ケース７１、７２を互いに同一形状に設けることができるので、製造効率の向上を図ることができる。   Further, according to the current sensor 1 described above, the connector 5 is provided so as to protrude from the connector through hole 73 provided in the housing case 7 along the Z-axis direction, and the housing case 7 is provided with the connector through hole 73. It is provided to divide. Thus, even if the Hall IC 3 is arranged in a space surrounded by the shield 6, the connector 5 can be easily attached to the housing case 7 so as to protrude from the housing case 7. Further, since the divided cases 71 and 72 can be provided in the same shape with respect to portions other than the connector through hole 73, the manufacturing efficiency can be improved.

次に、上述した電流センサ１のホールＩＣ３の配置位置の詳細について図５及び図６を参照して説明する。本発明者は、上述した図１〜図４に示す電流センサ１を用いて、ホールＩＣ３の位置がシールド６の中心位置Ｐｃ（図３参照）からＸ軸方向、Ｙ軸方向、Ｚ軸方向のそれぞれにずらしたときの電流測定誤差を測定した。結果を図５に示す。同図に示すように、Ｘ軸方向、Ｙ軸方向、Ｚ軸方向の３方向を比べるとＹ軸方向のズレによる電流測定誤差が最も大きくなることが分かった。   Next, details of the arrangement position of the Hall IC 3 of the current sensor 1 described above will be described with reference to FIGS. The inventor uses the current sensor 1 shown in FIGS. 1 to 4 described above, and the position of the Hall IC 3 extends from the center position Pc of the shield 6 (see FIG. 3) in the X axis direction, the Y axis direction, and the Z axis direction. The current measurement error when shifted to each was measured. The results are shown in FIG. As shown in the figure, it was found that the current measurement error due to the deviation in the Y-axis direction was the largest when the three directions of the X-axis direction, the Y-axis direction, and the Z-axis direction were compared.

次に、本発明者は、シールド６−電線２間の距離Ｌ２（図３参照）が３．５mm、６mm、８．５mm、１１mmの電流センサ１をそれぞれ作製して、中心位置Ｐｃを通りＹ軸方向に沿った直線Ｌ３上の配置位置におけるホールＩＣ３の検出磁束密度を測定した。結果を図６に示す。同図に示すように、ホールＩＣ３の検出磁束密度は、電線２から離れるに従って減少して最小となり、その後、シールド６のギャップＧ１からの漏れ磁束の影響により電線２から離れてシールド６の上端に近づくに従って増加する。同図から明らかなように、磁束密度の変化が最小となる位置Ｐmin付近は電線２付近やシールド６付近に比べて磁束密度の変化が平坦である。即ち、位置ＰminにホールＩＣ３を配置すれば、振動などによるホールＩＣ３のＹ軸方向の位置ズレが発生しても磁束密度の変化が少なく、電流測定誤差が小さくなる、ということが分かった。そこで、本実施形態ではホールＩＣ３は、予め測定した磁束密度の変化が最小となる位置に配置する。なお、この磁束密度の変化が最小となる位置Ｐminは、図６に示すように距離Ｌ２によって異なる。また、位置Ｐminは、シールド６の形状などによっても異なる。   Next, the present inventor manufactured current sensors 1 having a distance L2 between the shield 6 and the electric wire 2 (see FIG. 3) of 3.5 mm, 6 mm, 8.5 mm, and 11 mm, respectively, and passed through the center position Pc. The detected magnetic flux density of the Hall IC 3 at the arrangement position on the straight line L3 along the axial direction was measured. The results are shown in FIG. As shown in the figure, the detected magnetic flux density of the Hall IC 3 decreases and becomes the minimum as the distance from the electric wire 2 increases, and then the distance from the electric wire 2 to the upper end of the shield 6 due to the influence of the leakage magnetic flux from the gap G1 of the shield 6 Increases as you get closer. As is clear from the figure, the change in the magnetic flux density is flat in the vicinity of the position Pmin where the change in the magnetic flux density is minimum compared to the vicinity of the electric wire 2 and the vicinity of the shield 6. That is, it has been found that if the Hall IC 3 is arranged at the position Pmin, even if the Hall IC 3 is displaced in the Y-axis direction due to vibration or the like, the change in magnetic flux density is small and the current measurement error is small. Therefore, in the present embodiment, the Hall IC 3 is arranged at a position where the change in magnetic flux density measured in advance is minimized. Note that the position Pmin at which the change in the magnetic flux density is minimum differs depending on the distance L2, as shown in FIG. Further, the position Pmin varies depending on the shape of the shield 6 and the like.

このように配置すれば、ホールＩＣ３の配置位置が多少変動しても磁束密度の変化が平坦な領域内にホールＩＣ３を配置することができる。従って、周囲温度の変化に起因してホールＩＣ３を保持するケースの伸縮や振動などにより、ホールＩＣ３の配置位置が変動しても上述したように磁束密度の変化が小さいため、ホールＩＣ３の出力変動はほとんどなく、精度良く電流を測定することができる。   If arranged in this way, the Hall IC 3 can be arranged in a region where the change in magnetic flux density is flat even if the arrangement position of the Hall IC 3 slightly varies. Therefore, since the change in magnetic flux density is small as described above even if the arrangement position of the Hall IC 3 fluctuates due to expansion / contraction or vibration of the case holding the Hall IC 3 due to the change in the ambient temperature, the output fluctuation of the Hall IC 3 is small. The current can be measured with high accuracy.

次に、上述した電流センサ１の電線２の配置位置の詳細について図７を参照して説明する。本発明者は、上述した図１〜図４に示す電流センサ１を用いて、シールド６−電線２間の距離Ｌ２を変えたときのガタツキによる誤差を測定した。結果を図７に示す。なお、ホールＩＣ３は、各距離Ｌ２におけるＹ軸方向の磁束密度の変化が最小となる位置Ｐminに配置した。同図に示すように、電線２をシールド６に近づけるに従ってガタツキによる誤差が小さくなることが分かった。そこで、本発明の実施形態では、一対の係止凸部７５及び一対の突出部７８のうちコネクタ貫通孔７３とは反対側、即ち下端側の係止凸部７５及び突出部７８に最も近づけて電線貫通孔７４を設けた。これにより、電線２を可能な限りシールド６下端に近づけることができる。このように配置すれば、ホールＩＣ３を保持するケースの伸縮や振動などにより、ホールＩＣ３の配置位置が変動しても誤差を小さく抑えることができ、精度良く電流を測定することができる。   Next, the detail of the arrangement position of the electric wire 2 of the current sensor 1 described above will be described with reference to FIG. The inventor measured an error due to rattling when the distance L2 between the shield 6 and the electric wire 2 was changed using the current sensor 1 shown in FIGS. The results are shown in FIG. The Hall IC 3 is arranged at a position Pmin where the change in the magnetic flux density in the Y-axis direction at each distance L2 is minimized. As shown in the figure, it was found that the error due to rattling becomes smaller as the electric wire 2 is brought closer to the shield 6. Therefore, in the embodiment of the present invention, the pair of locking projections 75 and the pair of projections 78 are closest to the locking projections 75 and the projections 78 on the side opposite to the connector through hole 73, that is, the lower end side. An electric wire through hole 74 was provided. Thereby, the electric wire 2 can be brought as close to the lower end of the shield 6 as possible. With this arrangement, even if the arrangement position of the Hall IC 3 fluctuates due to expansion / contraction or vibration of the case that holds the Hall IC 3, the error can be suppressed small, and the current can be measured with high accuracy.

なお、上述した実施形態では、ホール素子ＩＣがシールド６上端寄りに設けられていて、電線貫通孔７４を下端側の係止凸部７５及び突出部７８に最も近づけて設けることにより、電線２がシールド６下端に可能な限り近づけるように配置していたが、本発明はこれに限ったものではない。例えば、ホール素子ＩＣがシールド６の下端寄りに設けられている場合は、電線貫通孔７４を上端側の係止凸部７５及び突出部７８に最も近づけて設けることにより、電線２をシールド６上端に可能な限り近づけるように配置してもよい。   In the above-described embodiment, the Hall element IC is provided near the upper end of the shield 6, and the electric wire 2 is formed by providing the electric wire through hole 74 closest to the locking convex portion 75 and the protruding portion 78 on the lower end side. Although it has been arranged as close as possible to the lower end of the shield 6, the present invention is not limited to this. For example, in the case where the Hall element IC is provided near the lower end of the shield 6, the electric wire 2 is provided at the upper end of the shield 6 by providing the electric wire through hole 74 closest to the upper-side locking convex portion 75 and the protruding portion 78. May be arranged as close as possible.

また、上述した実施形態では、シールド６を断面略矩形状に設けていたが、本発明はこれに限ったものではない。シールド６の断面形状としては、分割シールド６１、６２を互いに同一形状にすることができ、かつ、分割シールド６１、６２を互いに直線Ｌを対称軸として線対称にすることができる形状であればよい。   In the above-described embodiment, the shield 6 is provided with a substantially rectangular cross section, but the present invention is not limited to this. The cross-sectional shape of the shield 6 may be any shape as long as the split shields 61 and 62 can have the same shape as each other, and the split shields 61 and 62 can be symmetrical with respect to each other with the straight line L as the symmetry axis. .

また、前述した実施形態は本発明の代表的な形態を示したに過ぎず、本発明は、実施形態に限定されるものではない。即ち、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。   Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

本発明の電流センサの一実施の形態を示す斜視図である。It is a perspective view which shows one Embodiment of the current sensor of this invention. 図１に示す電流センサの分解斜視図である。It is a disassembled perspective view of the current sensor shown in FIG. 図１に示す電流センサのＩ−Ｉ線断面図である。It is the II sectional view taken on the line of the current sensor shown in FIG. 図１に示す収容ケースの部分拡大斜視図である。It is a partial expansion perspective view of the storage case shown in FIG. ホールＩＣの位置をシールド６の中心位置ＰｃからＸ軸方向、Ｙ軸方向、Ｚ軸方向のそれぞれにずらしたときの電流測定誤差を測定した結果を示すグラフである。It is a graph which shows the result of having measured the current measurement error when the position of Hall IC is shifted in the X-axis direction, the Y-axis direction, and the Z-axis direction from the center position Pc of the shield 6, respectively. シールド−電線間の距離が３．５mm、６mm、８．５mm、１１mmの電流センサをそれぞれ作製して、中心位置を通りＹ軸方向に沿った直線上の配置位置におけるホールＩＣ３の検出磁束密度を測定した結果を示すグラフである。Current sensors with shield-to-wire distances of 3.5 mm, 6 mm, 8.5 mm, and 11 mm were prepared, respectively, and the detected magnetic flux density of Hall IC 3 at the position on the straight line passing through the center position along the Y-axis direction. It is a graph which shows the measurement result. シールド−電線間の距離を変えたときのガタツキによる誤差を測定した結果を示すグラフである。It is a graph which shows the result of having measured the error by rattling when changing the distance between a shield and an electric wire. 従来の電流センサの一例を示す斜視図である。It is a perspective view which shows an example of the conventional current sensor.

符号の説明Explanation of symbols

１ 電流センサ
２ 電線（導体）
３ ホールＩＣ（磁電変換素子）
５ コネクタ
６ シールド（シールド板）
７ 収容ケース
７３ コネクタ貫通孔
７４ 電線貫通孔（導体貫通孔） 1 Current sensor 2 Electric wire (conductor)
3 Hall IC (magnetoelectric transducer)
5 Connector 6 Shield (Shield plate)
7 Housing case 73 Connector through hole 74 Electric wire through hole (conductor through hole)

Claims (4)

電流が流れる導体と、前記導体の長手方向を軸として軸周りを囲むように配置された前記長手方向と直交する分割方向に２分割されたシールド板と、前記導体に電流が流れたときに発生する磁界の磁束密度を検出して電気信号に変換する磁電変換素子と、を有する電流センサにおいて、
前記シールド板が、前記２分割された各々が互いに同一形状となり、かつ、前記２分割された各々が前記分割方向に沿った直線を対称軸として線対称となるように、設けられた
ことを特徴とする電流センサ。 Occurs when current flows through a conductor through which current flows, a shield plate that is divided into two in a dividing direction orthogonal to the longitudinal direction, and is arranged so as to surround the axis around the longitudinal direction of the conductor. In a current sensor having a magnetoelectric conversion element that detects a magnetic flux density of a magnetic field to be converted into an electric signal,
The shield plate is provided so that each of the two divided parts has the same shape, and each of the two divided parts is line-symmetric with respect to a straight line along the dividing direction. And current sensor. 前記導体が貫通する導体貫通孔を分割するように前記分割方向に分割された前記シールド板を収容する収容ケースと、前記磁電変換素子に電気的に接続されたコネクタと、を有する電流センサであって、
前記磁電変換素子が、前記シールド板に囲まれた空間に配置されるように設けられ、
前記コネクタが、前記収容ケースに設けたコネクタ貫通孔から前記長手方向に沿って突出するように設けられ、そして、
前記収容ケースが、前記コネクタ貫通孔を分割するように設けられた
ことを特徴とする請求項１に記載の電流センサ。 A current sensor having a housing case for housing the shield plate divided in the dividing direction so as to divide a conductor through-hole through which the conductor passes, and a connector electrically connected to the magnetoelectric transducer. And
The magnetoelectric conversion element is provided to be disposed in a space surrounded by the shield plate,
The connector is provided so as to protrude from the connector through hole provided in the housing case along the longitudinal direction; and
The current sensor according to claim 1, wherein the housing case is provided so as to divide the connector through hole. 前記収容ケースを構成する一対の分割ケース同士を係止するための一対の係止手段が、前記導体貫通孔及び前記コネクタ貫通孔を挟むように前記一対の分割ケースの各々に設けられ、そして、
前記導体貫通孔が、前記一対の係止手段のうちの前記コネクタ貫通孔とは反対側の係止手段に最も近づけて設けられた
ことを特徴とする請求項２に記載の電流センサ。 A pair of locking means for locking the pair of split cases constituting the housing case is provided in each of the pair of split cases so as to sandwich the conductor through hole and the connector through hole; and
The current sensor according to claim 2, wherein the conductor through hole is provided closest to a locking means opposite to the connector through hole of the pair of locking means. 前記磁電変換素子が、予め測定された前記導体と前記シールド板との間において前記導体に電流が流れたときに発生する磁界の磁束密度の変化が最小となる位置に配置されている
ことを特徴とする請求項１〜３何れか１項に記載の電流センサ。 The magnetoelectric conversion element is disposed at a position where a change in magnetic flux density of a magnetic field generated when a current flows between the conductor and the shield plate measured in advance is minimized. The current sensor according to any one of claims 1 to 3.
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