JP2003329751A - Magnetic flux detector - Google Patents
Magnetic flux detectorInfo
- Publication number
- JP2003329751A JP2003329751A JP2002139569A JP2002139569A JP2003329751A JP 2003329751 A JP2003329751 A JP 2003329751A JP 2002139569 A JP2002139569 A JP 2002139569A JP 2002139569 A JP2002139569 A JP 2002139569A JP 2003329751 A JP2003329751 A JP 2003329751A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic flux
- magnetic
- flux detector
- circuit
- slit portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000004907 flux Effects 0.000 title claims abstract description 47
- 101700004678 SLIT3 Proteins 0.000 abstract description 4
- 102100027339 Slit homolog 3 protein Human genes 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Hall/Mr Elements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば微小電流セ
ンサに用いられる磁束検出器の改良に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a magnetic flux detector used in, for example, a minute current sensor.
【０００２】[0002]
【従来の技術】従来、この種の磁束検出器として、例え
ば図４、図５に示すものがある（例えば特開２０００−
０９７９７３号公報参照）。2. Description of the Related Art Conventionally, as magnetic flux detectors of this type, there are those shown in, for example, FIGS.
097973).
【０００３】これについて説明すると、磁束検出器１
は、Ｃ字状の磁性体によって形成される磁気回路２と、
この磁気回路２の途中に開口するスリット部３と、この
スリット部３の磁束密度を検出する単一のホール素子４
とを備える。To explain this, the magnetic flux detector 1
Is a magnetic circuit 2 formed by a C-shaped magnetic body,
A slit portion 3 opening in the middle of the magnetic circuit 2 and a single Hall element 4 for detecting the magnetic flux density of the slit portion 3.
With.
【０００４】図４に矢印で示すように、電流Ｉが磁気回
路２の内側を貫通して流れるのに伴ってそのまわりに磁
界が生じ、電流Ｉの強さに応じた磁束が磁気回路２に分
布する。ホール素子４はこの磁束分布の変化に応じた信
号を出力し、この出力によって電流Ｉの強さが検出され
る。As shown by the arrow in FIG. 4, as the current I flows through the inside of the magnetic circuit 2, a magnetic field is generated around it, and a magnetic flux corresponding to the strength of the current I is generated in the magnetic circuit 2. To be distributed. The Hall element 4 outputs a signal corresponding to the change in the magnetic flux distribution, and the intensity of the current I is detected by this output.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の磁束検出器１にあっては、ホール素子４の分
解能により検出できる電流値が制限されるため、数１０
ｍＡの微小電流を検出できないという問題点があった。However, in such a conventional magnetic flux detector 1, the current value that can be detected is limited by the resolution of the Hall element 4, and therefore the following equation (10) is used.
There is a problem that a minute current of mA cannot be detected.
【０００６】磁気回路２を構成する磁性体の透磁率を高
めることによっても、磁束検出器１の分解能を高められ
るが、スリット部３の開口幅等による影響に比べてその
効果はわずかなものであり、微小電流を検出することが
できないという問題点があった。The resolution of the magnetic flux detector 1 can also be increased by increasing the magnetic permeability of the magnetic material forming the magnetic circuit 2, but the effect is slight compared to the influence of the opening width of the slit portion 3 and the like. However, there is a problem that a minute current cannot be detected.
【０００７】本発明は上記の問題点に鑑みてなされたも
のであり、微小電流を検出できる磁束検出器を提供する
ことを目的とする。The present invention has been made in view of the above problems, and an object thereof is to provide a magnetic flux detector capable of detecting a minute current.
【０００８】[0008]
【課題を解決するための手段】第１の発明は、一部がス
リット部として開口するＣ字状の磁性体によって形成さ
れる磁気回路と、このスリット部の磁束密度を検出する
磁束密度検出手段とを備える磁束検出器において、磁束
密度検出手段としてスリット部に複数のホール素子を並
列に介装したことを特徴とするものとした。SUMMARY OF THE INVENTION A first invention is a magnetic circuit formed by a C-shaped magnetic body, a part of which is opened as a slit portion, and a magnetic flux density detecting means for detecting the magnetic flux density of the slit portion. In the magnetic flux detector including the above, a plurality of Hall elements are provided in parallel in the slit portion as the magnetic flux density detecting means.
【０００９】第２の発明は、第１の発明において、各ホ
ール素子の出力を加算する加算回路を備えたことを特徴
とするものとした。A second invention is characterized in that, in the first invention, an adding circuit for adding the outputs of the respective hall elements is provided.
【００１０】[0010]
【発明の作用および効果】第１の発明によると、磁気回
路のスリット部に並列に介装した複数のホール素子を用
いて磁束検出器の分解能を高められる。これにより、単
一のホール素子によって検出できなかった数１０ｍＡの
微小電流を精度良く検出することが可能となる。According to the first aspect of the invention, the resolution of the magnetic flux detector can be improved by using a plurality of Hall elements arranged in parallel in the slit portion of the magnetic circuit. This makes it possible to accurately detect a minute current of several tens of mA, which could not be detected by a single Hall element.
【００１１】複数のホール素子がスリット部に並列に介
装される構造のため、ホール素子の個数を増やしても、
スリット部の開口幅を大きくすることなく、磁気回路の
磁束密度を低下させないで済み、微小電流を検出するこ
とが可能となる。Since a plurality of Hall elements are arranged in parallel in the slit portion, even if the number of Hall elements is increased,
It is possible to detect a minute current without increasing the opening width of the slit portion and reducing the magnetic flux density of the magnetic circuit.
【００１２】第２の発明によると、複数のホール素子の
出力電圧が加算回路を介して加算されることにより、磁
束検出器の分解能を高められる。According to the second aspect of the invention, the output voltages of the plurality of Hall elements are added via the adder circuit, so that the resolution of the magnetic flux detector can be improved.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面に基づいて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１４】図１、図２に示すように、例えば微小電流
センサに用いられる磁束検出器１は、Ｃ字状の磁性体に
よって形成される磁気回路２と、磁気回路２の途中に開
口するスリット部３とを備え、このスリット部３の磁束
密度を検出する構成となっている。As shown in FIGS. 1 and 2, a magnetic flux detector 1 used in, for example, a minute current sensor, has a magnetic circuit 2 formed of a C-shaped magnetic body and a slit opened in the middle of the magnetic circuit 2. The slit 3 is provided, and the magnetic flux density of the slit 3 is detected.
【００１５】スリット部３の磁束密度を検出する磁束密
度検出手段として、スリット部３に４つのホール素子４
を並列に介装する。ホール素子４の個数は４個に限ら
ず、スリット部３のスペースに応じて任意に設定され
る。As the magnetic flux density detecting means for detecting the magnetic flux density of the slit portion 3, four Hall elements 4 are provided in the slit portion 3.
Are installed in parallel. The number of Hall elements 4 is not limited to four, and may be set arbitrarily according to the space of the slit portion 3.
【００１６】各ホール素子４はリード線６を介して通電
され、その出力電圧値がこれを通過する磁束密度に応じ
て変化する。Each Hall element 4 is energized via a lead wire 6, and its output voltage value changes according to the magnetic flux density passing through it.
【００１７】断面四角形の空間を形成するスリット部３
は４つの隅部を持ち、各ホール素子４は各隅部に沿って
配置される。換言すると、各ホール素子４は磁気回路２
を構成する磁性体のエッジ部に沿って配置される。これ
により、スリット部３に分布する磁束が磁気回路２を構
成する磁性体のエッジ部を介して各ホール素子４に集め
られ、各ホール素子４による磁束の検出精度を高められ
る。なお、これに限らず、各ホール素子４をスリット部
３の隅部から離して設けることも可能である。Slit portion 3 forming a space having a rectangular cross section
Has four corners, and each Hall element 4 is arranged along each corner. In other words, each Hall element 4 has a magnetic circuit 2
Are arranged along the edge portion of the magnetic body. As a result, the magnetic flux distributed in the slit portion 3 is collected in each Hall element 4 via the edge portion of the magnetic body forming the magnetic circuit 2, and the accuracy of detecting the magnetic flux by each Hall element 4 can be improved. However, the present invention is not limited to this, and it is possible to provide each Hall element 4 apart from the corner of the slit portion 3.
【００１８】図３は磁束検出器１を構成する電気回路を
示している。４つのホール素子４は加算回路５を介して
並列に接続され、各ホール素子４の出力電圧が加算され
た電圧が増幅器８を介してセンサ電圧として出力され
る。FIG. 3 shows an electric circuit constituting the magnetic flux detector 1. The four Hall elements 4 are connected in parallel via an adder circuit 5, and the voltage obtained by adding the output voltages of the Hall elements 4 is output as a sensor voltage via an amplifier 8.
【００１９】以上のように構成され、磁束検出器１は電
流Ｉを導く電線（図示せず）をその内側に貫通させるよ
うにセットされ、この電線に接触することなく電流Ｉの
電流値を検出する。The magnetic flux detector 1 configured as described above is set so that an electric wire (not shown) for guiding the electric current I penetrates through the electric wire, and the electric current value of the electric current I is detected without touching the electric wire. To do.
【００２０】図１に矢印で示すように、電流Ｉが磁気回
路２の内側を貫通して流れるのに伴ってそのまわりに磁
界が生じ、電流Ｉの強さに応じた磁束が磁気回路２に分
布する。磁気回路２における磁束密度に応じて各ホール
素子４の出力電圧値が変化し、増幅器８を介してセンサ
電圧として出力される。As indicated by the arrow in FIG. 1, as the current I flows through the inside of the magnetic circuit 2, a magnetic field is generated around it, and a magnetic flux corresponding to the strength of the current I is generated in the magnetic circuit 2. To be distributed. The output voltage value of each Hall element 4 changes according to the magnetic flux density in the magnetic circuit 2, and is output as a sensor voltage via the amplifier 8.
【００２１】各ホール素子４がスリット部３に並列に介
装される構造のため、ホール素子４の個数を増やして
も、スリット部３の開口幅（隙間）を大きくすることな
く、磁気回路２の磁束密度を低下させないで済む。Since each Hall element 4 is arranged in parallel with the slit section 3, even if the number of Hall elements 4 is increased, the magnetic circuit 2 is not increased in the opening width (gap) of the slit section 3. It is not necessary to reduce the magnetic flux density of.
【００２２】４個のホール素子４の出力電圧は加算回路
５を介して加算されることにより、ホール素子４の分解
能によって制限される磁束検出器１の分解能を４倍に高
められる。これにより、従来１個のホール素子４によっ
て検出できなかった数１０ｍＡの微小電流を精度良く検
出することが可能となる。The output voltages of the four Hall elements 4 are added via the adder circuit 5, whereby the resolution of the magnetic flux detector 1 limited by the resolution of the Hall elements 4 can be increased four times. As a result, it becomes possible to accurately detect a minute current of several tens of mA, which could not be detected by the single Hall element 4 in the related art.
【００２３】なお、磁気回路２は、前記実施の形態のよ
うに円環状に限らず、例えば三角形や四角形に沿った環
状に形成しても良い。The magnetic circuit 2 is not limited to the annular shape as in the above embodiment, but may be formed in an annular shape along a triangle or a quadrangle, for example.
【００２４】また、磁束検出器１は微小電流センサに限
らず、永久磁石等と組み合わせた変位センサに用いても
良い。The magnetic flux detector 1 is not limited to the minute current sensor, and may be used for a displacement sensor combined with a permanent magnet or the like.
【００２５】本発明は上記の実施の形態に限定されず
に、その技術的な思想の範囲内において種々の変更がな
しうることは明白である。It is obvious that the present invention is not limited to the above-mentioned embodiments and various modifications can be made within the scope of the technical idea thereof.
【図１】本発明の実施の形態を示す磁束検出器の側面
図。FIG. 1 is a side view of a magnetic flux detector showing an embodiment of the present invention.
【図２】同じく磁束検出器の正面図。FIG. 2 is a front view of the magnetic flux detector.
【図３】同じく磁束検出器の電気回路図。FIG. 3 is an electric circuit diagram of the magnetic flux detector.
【図４】従来例を示す磁束検出器の側面図。FIG. 4 is a side view of a magnetic flux detector showing a conventional example.
【図５】同じく磁束検出器の正面図。FIG. 5 is a front view of the magnetic flux detector.
１ 磁束検出器 ２ 磁気回路 ３ スリット部 ４ ホール素子 ５ 加算回路 1 Magnetic flux detector 2 magnetic circuit 3 slit part 4 Hall element 5 adder circuit
Claims (2)
磁性体によって形成される磁気回路と、 このスリット部の磁束密度を検出する磁束密度検出手段
とを備える磁束検出器において、 前記磁束密度検出手段として前記スリット部に複数のホ
ール素子を並列に介装したことを特徴とする磁束検出
器。1. A magnetic flux detector comprising a magnetic circuit formed by a C-shaped magnetic body, a part of which is opened as a slit portion, and a magnetic flux density detecting means for detecting the magnetic flux density of the slit portion. A magnetic flux detector characterized in that a plurality of Hall elements are interposed in parallel in the slit portion as density detecting means.
路を備えたことを特徴とする請求項１に記載の磁束検出
器。2. The magnetic flux detector according to claim 1, further comprising an adder circuit for adding the outputs of the respective Hall elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002139569A JP2003329751A (en) | 2002-05-15 | 2002-05-15 | Magnetic flux detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002139569A JP2003329751A (en) | 2002-05-15 | 2002-05-15 | Magnetic flux detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003329751A true JP2003329751A (en) | 2003-11-19 |
Family
ID=29700678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002139569A Pending JP2003329751A (en) | 2002-05-15 | 2002-05-15 | Magnetic flux detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003329751A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006197684A (en) * | 2005-01-12 | 2006-07-27 | Matsushita Electric Ind Co Ltd | Brushless motor |
| JP2009058403A (en) * | 2007-08-31 | 2009-03-19 | Yamari Sangyo Kk | Thermocouple |
| JP2010230658A (en) * | 2009-03-13 | 2010-10-14 | Vacuumschmelze Gmbh & Co Kg | Low hysteresis sensor |
-
2002
- 2002-05-15 JP JP2002139569A patent/JP2003329751A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006197684A (en) * | 2005-01-12 | 2006-07-27 | Matsushita Electric Ind Co Ltd | Brushless motor |
| JP4725109B2 (en) * | 2005-01-12 | 2011-07-13 | パナソニック株式会社 | Brushless motor |
| JP2009058403A (en) * | 2007-08-31 | 2009-03-19 | Yamari Sangyo Kk | Thermocouple |
| JP2010230658A (en) * | 2009-03-13 | 2010-10-14 | Vacuumschmelze Gmbh & Co Kg | Low hysteresis sensor |
| US8405391B2 (en) | 2009-03-13 | 2013-03-26 | Vacuumschmelze Gmbh & Co. Kg | Low hysteresis sensor |
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