JP2004245776A - Current sensor device - Google Patents

Current sensor device Download PDF

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Publication number
JP2004245776A
JP2004245776A JP2003038121A JP2003038121A JP2004245776A JP 2004245776 A JP2004245776 A JP 2004245776A JP 2003038121 A JP2003038121 A JP 2003038121A JP 2003038121 A JP2003038121 A JP 2003038121A JP 2004245776 A JP2004245776 A JP 2004245776A
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Japan
Prior art keywords
magnetic
sensor
yoke
current
gap
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JP2003038121A
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Japanese (ja)
Inventor
Tomoki Ito
知樹 伊藤
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Denso Corp
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Denso Corp
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Priority to JP2003038121A priority Critical patent/JP2004245776A/en
Publication of JP2004245776A publication Critical patent/JP2004245776A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/207—Constructional details independent of the type of device used

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce restriction of insertion arrangement of a current carrier wherein a measuring current flows, and to reduce material cost of a magnetic yoke. <P>SOLUTION: The magnetic yoke 1 has two magnetic bodies 2, 3 and is constituted circularly as a whole. An aperture 4 for sensor arrangement is formed between one end 2a of one magnetic body 2 and one end 3a of the other magnetic body 3, and an aperture 6 for passage passable by the current carrier 5 wherein the measuring current flows is formed between the other end 2b of one magnetic body 2 and the other end 3b of the other magnetic body 3. A magnetic sensor 7 is arranged in the aperture 4 for sensor arrangement, and the magnetic sensor 7 generates an electric signal corresponding to the intensity of a magnetic field in the aperture 4 for sensor arrangement. The two magnetic bodies 2, 3 of the magnetic yoke 1 and the magnetic sensor 7 are integrated by a resin 8 mold. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、磁気ヨークの空隙内に磁気センサを配置した電流センサ装置に関する。
【０００２】
【従来の技術】
従来の磁気センサ装置としては、被測定電流が流れる電流担体を磁気ヨークで囲い、この磁気ヨークの一部に空隙を設け、この空隙に、該空隙内の磁界の強さに応じた電気信号を発生する磁気センサを配置する構成が知られている（例えば特許文献１）。
【０００３】
【特許文献１】
特開２００２−２１４２７２
【０００４】
【発明が解決しようとする課題】
ところが、空隙に磁気センサを配置した磁気ヨークは、閉ループ状をなしており、電流担体を磁気ヨークに挿入するのは、磁気ヨークの内部空間に軸方向から挿入するしかなく、制約が多い。また、磁気ヨーク自体はＣ字状をなすため、磁気ヨークの材料取りの歩留まりが悪く、結果的に材料コストが増加する欠点があった。
【０００５】
本発明は上記事情に鑑みてなされたものであり、その目的は、被測定電流が流れる電流担体の挿入配置の制約が少なくて、使い勝手が良く、しかも、磁気ヨークの材料取りの歩留まりが良くなって材料コストの低減を図り得る電流センサ装置を提供するにある。
【０００６】
【課題を解決するための手段】
請求項１の発明においては、磁気ヨークを、二つの磁性体から構成したから、磁気ヨークの材料取りの歩留まりが良くなり、材料コストを低減できる。また、この磁気ヨークには、被測定電流を流す電流担体が通過可能な通過用空隙が形成されているから、電流担体の挿入配置の制約が無くなって使い勝手が良い。
【０００７】
この場合、請求項２の発明のように、磁気ヨークの二つの磁性体及び磁気センサを、樹脂モールドにより一体化しても良い。
【０００８】
【発明の実施の形態】
以下、本発明の第１の実施例につき図１を参照して説明する。磁気ヨーク１は、二つの磁性体２、３を有して全体として環状に構成されている。磁性体２、３は強磁性材（例えば鉄、ニッケル、コバルト系材料、）から構成されている。この場合、一方の磁性体２の一端２ａと他方の磁性体３の一端３ａとの間にセンサ配置用空隙４を形成し（便宜上寸法線４にて示す）、一方の磁性体２の他端２ｂと他方の磁性体３の他端３ｂとの間に、被測定電流を流す電流担体５が通過可能な通過用空隙６を形成している。
【０００９】
前記センサ配置用空隙４内には磁気センサ７が配置されており、この磁気センサ７は、例えばホールＩＣチップを樹脂モールドしたもので、センサ配置用空隙４内の磁界の強さに応じた電気信号を発生するものである。そして、磁気ヨーク１の二つの磁性体２、３及び磁気センサ７は、樹脂８のモールドにより一体化されている。なお、前記通過用空隙６はセンサ配置用空隙４と正反対側に位置している。
【００１０】
この実施例においては、磁気センサ７部分における磁界強度は、センサ配置用空隙４の幅（端２ａ及び３ａ間距離）で決まり、もう一つの空隙である通過用空隙６の幅に対しては鈍感である。つまり、センサ配置用空隙４の幅は重要であるが、他の寸法については大まかでも良い。従って電流担体５の位置ずれなどがあっても十分な電流検出が可能である。
【００１１】
この実施例においては、磁気ヨーク１を、二つの磁性体２、３を有して全体として環状に構成したから、磁気ヨーク１の材料取りの歩留まりが良くなり、材料コストを低減できる。また、この磁気ヨーク１には、被測定電流を流す電流担体５が通過可能な通過用空隙６が形成されているから、電流担体５の挿入配置の制約が無くなって使い勝手が良い。
【００１２】
なお、通過用空隙６の形成位置は、前記第１の実施例に限られるものではなく、本発明の第２の実施例として示す図２及び第３の実施例として示す図３のように変更しても良い。また、磁性体２、３及び磁気センサ７は非磁性材製の取付具やケースにより相互に固定した構成としても良い。また磁気ヨークは矩形環状でなく円環状でも良い。
【図面の簡単な説明】
【図１】本発明の第１の実施例を示す電流センサ装置全体の斜視図
【図２】本発明の第２の実施例を示す電流センサ装置全体の斜視図
【図３】本発明の第３の実施例を示す電流センサ装置全体の斜視図
【符号の説明】
１は磁気ヨーク、２、３は磁性体、４はセンサ配置用空隙、５は電流担体、６は通過用空隙、７は磁気センサを示す。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a current sensor device in which a magnetic sensor is arranged in a gap of a magnetic yoke.
[0002]
[Prior art]
As a conventional magnetic sensor device, a current carrier through which a current to be measured flows is surrounded by a magnetic yoke, a gap is provided in a part of the magnetic yoke, and an electric signal corresponding to the strength of a magnetic field in the gap is provided in the gap. A configuration in which a generated magnetic sensor is arranged is known (for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-214272
[0004]
[Problems to be solved by the invention]
However, the magnetic yoke in which the magnetic sensor is disposed in the air gap has a closed loop shape, and the insertion of the current carrier into the magnetic yoke has to be inserted into the internal space of the magnetic yoke from the axial direction, and there are many restrictions. In addition, since the magnetic yoke itself has a C-shape, the yield of material for the magnetic yoke is low, resulting in an increase in material cost.
[0005]
The present invention has been made in view of the above circumstances, and has as its object to reduce restrictions on the insertion arrangement of a current carrier through which a current to be measured flows, to improve ease of use, and to improve the yield of material removal of a magnetic yoke. To provide a current sensor device that can reduce the material cost.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, since the magnetic yoke is composed of two magnetic bodies, the yield of material removal of the magnetic yoke is improved, and the material cost can be reduced. In addition, since the magnetic yoke is formed with a passage gap through which a current carrier through which a current to be measured flows can be passed, there is no restriction on the insertion arrangement of the current carrier and the device is easy to use.
[0007]
In this case, the two magnetic bodies of the magnetic yoke and the magnetic sensor may be integrated by a resin mold.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. The magnetic yoke 1 has two magnetic bodies 2 and 3 and is formed in a ring shape as a whole. The magnetic bodies 2 and 3 are made of a ferromagnetic material (for example, iron, nickel, or a cobalt-based material). In this case, a gap 4 for sensor arrangement is formed between one end 2a of one magnetic body 2 and one end 3a of the other magnetic body 3 (indicated by a dimension line 4 for convenience), and the other end of one magnetic body 2 is formed. Between the second magnetic body 2b and the other end 3b of the other magnetic body 3, there is formed a passage gap 6 through which a current carrier 5 for flowing a current to be measured can pass.
[0009]
A magnetic sensor 7 is arranged in the sensor arrangement space 4. The magnetic sensor 7 is formed by, for example, resin-molding a Hall IC chip, and has an electric power corresponding to the strength of the magnetic field in the sensor arrangement space 4. It generates a signal. The two magnetic bodies 2 and 3 of the magnetic yoke 1 and the magnetic sensor 7 are integrated by a resin 8 mold. The passage gap 6 is located on the opposite side of the sensor arrangement gap 4.
[0010]
In this embodiment, the magnetic field strength at the magnetic sensor 7 is determined by the width of the sensor arrangement gap 4 (distance between the ends 2a and 3a), and is insensitive to the width of the other gap, the passage gap 6. It is. That is, the width of the sensor arrangement gap 4 is important, but other dimensions may be roughly. Therefore, sufficient current detection can be performed even if the current carrier 5 is displaced.
[0011]
In this embodiment, since the magnetic yoke 1 has the two magnetic members 2 and 3 and is formed in a ring shape as a whole, the yield of material for the magnetic yoke 1 is improved, and the material cost can be reduced. Further, since the magnetic yoke 1 is formed with the passage gap 6 through which the current carrier 5 through which the current to be measured flows can be passed, there is no restriction on the insertion arrangement of the current carrier 5 and the usability is good.
[0012]
The position of the passage gap 6 is not limited to the first embodiment, but may be changed as shown in FIGS. 2 and 3 as the second embodiment and the third embodiment of the present invention. You may. Further, the magnetic bodies 2 and 3 and the magnetic sensor 7 may be fixed to each other by an attachment or a case made of a non-magnetic material. Further, the magnetic yoke may be annular instead of rectangular.
[Brief description of the drawings]
FIG. 1 is a perspective view of an entire current sensor device according to a first embodiment of the present invention; FIG. 2 is a perspective view of an entire current sensor device according to a second embodiment of the present invention; FIG. 3 is a perspective view of the entire current sensor device according to the third embodiment.
1 is a magnetic yoke, 2 and 3 are magnetic materials, 4 is a gap for disposing a sensor, 5 is a current carrier, 6 is a gap for passing, and 7 is a magnetic sensor.

Claims (2)

二つの磁性体を有して全体としてほぼ環状に構成され、一方の磁性体の一端と他方の磁性体の一端との間にセンサ配置用空隙を形成し、一方の磁性体の他端と他方の磁性体の他端との間に、被測定電流を流す電流担体が通過可能な通過用空隙を形成した磁気ヨークと、
この磁気ヨークの前記センサ配置用空隙内に配置され、このセンサ配置用空隙内の磁界の強さに応じた電気信号を発生する磁気センサと
を備えて構成されたことを特徴とする電流センサ装置。It has a substantially annular shape as a whole having two magnetic bodies, forms a sensor arrangement gap between one end of one magnetic body and one end of the other magnetic body, and has the other end of one magnetic body and the other end. Between the other end of the magnetic body, a magnetic yoke having a passage gap through which a current carrier for flowing a current to be measured can pass;
A current sensor device comprising: a magnetic sensor that is arranged in the sensor arrangement gap of the magnetic yoke and generates an electric signal according to the strength of a magnetic field in the sensor arrangement gap. . 磁気ヨークの二つの磁性体は、樹脂モールドにより一体化されていることを特徴とする請求項１記載の電流センサ装置。2. The current sensor device according to claim 1, wherein the two magnetic members of the magnetic yoke are integrated by a resin mold.
JP2003038121A 2003-02-17 2003-02-17 Current sensor device Pending JP2004245776A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7205757B2 (en) 2004-09-02 2007-04-17 Denso Corporation High precision current sensor
JP2007147514A (en) * 2005-11-29 2007-06-14 Denso Corp Current sensor, and core of current sensor
JP2010117165A (en) * 2008-11-11 2010-05-27 Tdk Corp Current sensor
CN102265167A (en) * 2009-01-19 2011-11-30 矢崎总业株式会社 Structure for assembling current detecting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7205757B2 (en) 2004-09-02 2007-04-17 Denso Corporation High precision current sensor
JP2007147514A (en) * 2005-11-29 2007-06-14 Denso Corp Current sensor, and core of current sensor
JP2010117165A (en) * 2008-11-11 2010-05-27 Tdk Corp Current sensor
CN102265167A (en) * 2009-01-19 2011-11-30 矢崎总业株式会社 Structure for assembling current detecting device

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