JP2582132B2 - Magnetic field sensor - Google Patents
Magnetic field sensorInfo
- Publication number
- JP2582132B2 JP2582132B2 JP63214464A JP21446488A JP2582132B2 JP 2582132 B2 JP2582132 B2 JP 2582132B2 JP 63214464 A JP63214464 A JP 63214464A JP 21446488 A JP21446488 A JP 21446488A JP 2582132 B2 JP2582132 B2 JP 2582132B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- magnetic
- field sensor
- winding
- output voltage
- 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.)
- Expired - Fee Related
Links
Landscapes
- Measuring Magnetic Variables (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、主として自動車ナビゲーションシステム、
携帯用コンパスとして使用される方位センサ、あるいは
回転センサとして適用するに好適な特性を有する磁界セ
ンサに関する。The present invention mainly relates to an automobile navigation system,
The present invention relates to a magnetic field sensor having characteristics suitable for being applied as a bearing sensor or a rotation sensor used as a portable compass.
（従来の技術） 従来の磁界センサは、第５図に示すように、磁芯１に
励磁巻線２と検出巻線３とを巻回し、励磁巻線２に電源
４により交流電流を流し、これにより磁芯１に磁芯の軸
心方向に内部磁界Hiを発生させ、該内部磁界Hiに対して
バイアスとして作用する外部磁界Hoの大きさにより、検
出巻線３の出力端子５に現われる基本波または高調波の
出力電圧が変化するものである。この磁界センサは、例
えば電流センサとして使用されるもので、電流の大小に
よって変化する外部磁界Hoの大小の変化が出力電圧の変
化として検出できる。(Prior Art) In a conventional magnetic field sensor, as shown in FIG. 5, an exciting winding 2 and a detecting winding 3 are wound around a magnetic core 1, and an alternating current is supplied to the exciting winding 2 by a power supply 4. Accordingly it generates an internal magnetic field H i to the magnetic core 1 in the axial direction of the magnetic core, the magnitude of the external magnetic field H o acting as a bias with respect to said internal magnetic field H i, the output terminal 5 of the detection winding 3 The output voltage of the fundamental wave or the harmonic wave appearing in the above changes. The magnetic field sensor, for example intended to be used as a current sensor, a change in the magnitude of the external magnetic field H o that varies with the magnitude of the current can be detected as a change in the output voltage.
第６図は、第５図の磁界センサの用途を変えたもの
で、磁芯１と外部磁界Hoとの相対的な向きが変化するよ
うに磁界センサあるいは磁石等の外部磁界発生手段を配
置し、磁芯１の内部磁界Hiに対し、外部磁界Hoの磁芯１
と同方向成分Ho・cosθの変化が出力電圧の変化として
現われるようにしたものである。この磁界センサは、単
体あるいは複数個のものを組合わせて方位センサ、傾斜
センサ等に使用される。Figure 6 is obtained by changing a fifth view of a magnetic field sensor applications, place the external magnetic field generating means such as a magnetic sensor or a magnet so that the relative orientation of the magnetic core 1 and the external magnetic field H o is changed and, to the internal magnetic field H i of the magnetic core 1, core 1 of the external magnetic field H o
And in which changes in the same direction component H o · cos [theta] is to appear as a change in the output voltage. This magnetic field sensor is used alone or in combination of a plurality of magnetic field sensors as an orientation sensor, an inclination sensor, or the like.
第５図および第６図に示す磁界センサは、第７図
（Ａ）に示すように、内部磁界Hiに対し、外部磁界Hoの
磁束の方向が平行となり、第７図（Ｂ）に示すように、
外部磁界Hoと内部磁界Hiの向きが同じである場合には磁
界強度が最大となり、同（Ｃ）に示すように逆方向にな
ると最小となり、この変化が出力電圧として検出できる
わけである。Magnetic field sensor shown in FIG. 5 and FIG. 6, as shown in FIG. 7 (A), to the internal magnetic field H i, the direction of the magnetic flux of the external magnetic field H o is parallel to FIG. 7 (B) As shown,
Magnetic field strength when the direction of the external magnetic field H o and the internal magnetic field H i is the same is maximum, becomes minimal becomes the opposite direction as shown in (C), it is not the change can be detected as the output voltage .
上記の他、従来の磁界センサとして、ホール素子を用
いたものがある。In addition to the above, there is a conventional magnetic field sensor using a Hall element.
（発明が解決しようとする課題） 上記従来の磁界センサのうち、第５図および第６図に
示したものは、励磁巻線２と検出巻線３の２つの巻線が
必要であり、構造が複雑になるという問題点がある。ま
た、ホール素子を用いた磁界センサは、感度が悪いとい
う問題点がある。(Problems to be Solved by the Invention) Among the above-mentioned conventional magnetic field sensors, those shown in FIGS. 5 and 6 require two windings, an excitation winding 2 and a detection winding 3, and have a structure. Is complicated. Further, the magnetic field sensor using the Hall element has a problem that the sensitivity is poor.
このような問題点を解決しうる磁界センサとして、本
発明者等は、導電性を有する線状または帯状をなす磁性
体に巻線を巻回し、磁性体にパルス電流あるいは交流電
流の流し、巻線に生じる電気信号の大小、極性から方位
等を知るものを開発中である。このように構成した磁界
センサは、軽量で廉価に構成でき、しかも非常に感度が
高いという長所を有するものである。As a magnetic field sensor capable of solving such a problem, the present inventors wound a winding around a conductive linear or band-shaped magnetic body, passed a pulse current or an alternating current through the magnetic body, and wound the winding. We are developing a device that knows the azimuth from the magnitude and polarity of the electric signal generated in the line. The magnetic field sensor thus configured has the advantages of being lightweight and inexpensive, and of having very high sensitivity.
本発明は、上述のように、磁性体に通電し、磁性体に
巻回した巻線より得られる電気信号から方位等を知る構
成の磁界センサにおいて、地磁気（0.3Oe〜0.5Oe）ある
いは地磁気程度の磁界に対して飽和せず、磁界強度と出
力電圧との関係に線形性が得られる磁界センサを提供す
ることを目的とする。As described above, the present invention relates to a magnetic field sensor having a configuration in which a current is supplied to a magnetic material and the direction and the like are known from an electric signal obtained from a winding wound on the magnetic material, and the geomagnetism (0.3 Oe to 0.5 Oe) or It is an object of the present invention to provide a magnetic field sensor which does not saturate with respect to the magnetic field and has a linearity in the relationship between the magnetic field strength and the output voltage.
（課題を解決するための手段） この目的を達成するため、本発明の磁界センサは、前
記導電性を有する線状等の形状の磁性体にパルス電流等
を流し、磁性体に巻回した検出巻線から出力を得る構成
としたものにおいて、前記磁性体の断面積を0.025mm2〜
0.28mm2としたことを特徴とする。(Means for Solving the Problems) In order to achieve this object, a magnetic field sensor according to the present invention provides a detection method in which a pulse current or the like is applied to a magnetic material having a linear shape or the like having conductivity and wound around the magnetic material. In a configuration in which an output is obtained from a winding, a cross-sectional area of the magnetic body is 0.025 mm 2 to
It is characterized by 0.28 mm 2 .
本発明において、前記磁性体としては、１本の磁性線
のみならず、アモルファス合金線を束ねたものを用いる
ことができる。In the present invention, as the magnetic material, not only one magnetic wire but also a bundle of amorphous alloy wires can be used.
（実施例） 第１図は本発明による磁界センサの一実施例である。
６は導電性を有する磁性材でなる複数本のアモルファス
合金線を束ねて構成した磁性体であり、７は該磁性体６
に巻回した導線等からなる検出巻線、８は前記磁性体６
に長手方向にパルス電流あるいは交流電流を流す電源で
ある。(Embodiment) FIG. 1 shows an embodiment of a magnetic field sensor according to the present invention.
Reference numeral 6 denotes a magnetic body formed by bundling a plurality of amorphous alloy wires made of a conductive magnetic material.
A detection winding composed of a conductive wire wound around the magnetic body 6
Is a power supply for supplying a pulse current or an alternating current in the longitudinal direction.
いま、電源８により、例えば第２図に示すような駆動
パルス電圧Eiを磁性体６に加えて電流を流すと、電流の
立ち上がり、立ち下がりにおいて、該磁性体６に巻回さ
れた検出巻線７の両端9,10に、外部磁界Hoの磁性体６と
の同方向成分Hi＝Ho・cosθに応じた波高Ｈの電圧が発
生する。Now, the power source 8, for example, a drive pulse voltage E i as shown in Figure 2, current is added to the magnetic body 6, the rise of the current, the falling detection winding which is wound magnetic member 6 wound across 9 and 10 of the line 7, the voltage of the wave height H is generated in response to an external magnetic field H in the same direction component of the magnetic body 6 o H i = H o · cosθ .
磁性体６として、振幅透磁率μａ＝20,000、飽和磁束
密度Bs＝８（kG）、長さｌ＝100mm、単線の断面積を0.0
14mm2としたCo系アモルファス合金線を用い、また、巻
線７の巻数を500ターン、磁性体６に流す波高値を100m
A、駆動パルスの繰返し周波数を10kHzとし、磁性体６を
構成するアモルファス合金線の本数を種々に変えた場合
の磁界強度と出力電圧との関係を第３図に示す。As the magnetic material 6, the amplitude permeability μ a = 20,000, the saturation magnetic flux density B s = 8 (kG), the length l = 100 mm, and the cross-sectional area of a single wire is 0.0
A 14 mm 2 Co-based amorphous alloy wire was used. The number of turns of the winding 7 was 500 turns, and the peak value flowing through the magnetic material 6 was 100 m.
A, FIG. 3 shows the relationship between the magnetic field strength and the output voltage when the repetition frequency of the driving pulse is 10 kHz and the number of amorphous alloy wires constituting the magnetic body 6 is variously changed.
第３図から明らかなように、上記の条件下において
は、アモルファス合金線の本数が10本以上（すなわち、
磁性体６の総断面積が0.14mm2以上）になると、0Oe〜0.
3Oeの範囲のおいて、磁界強度と出力電圧との電圧に線
形性が得られた。このような線形性は、検出巻線７の巻
線に拘りなく、かつ、駆動パルスの波形にあまり関係し
ない。ただし、巻線７の巻数や駆動パルスによる電流の
立上がり、立下がりは出力電圧の高低に関係するため、
巻数は100ターン〜1,500ターン、電流の立上がり、立下
がり速度（dA/dt）は120mA/μｓ〜750mA/μｓ程度と
し、波高値は20mA〜150mA程度とすることが実用的であ
る。また、磁性体６の長さは10mm〜100mm程度とし、断
面積は、あまり大きくすると不経済となるから、経済性
の面から言えば、最大0.28mm2程度あれば良い。As is clear from FIG. 3, under the above conditions, the number of amorphous alloy wires is 10 or more (that is,
When the total cross-sectional area of the magnetic body 6 becomes 0.14 mm 2 or more), it is 0 Oe to 0.
Within the range of 3 Oe, linearity was obtained between the magnetic field strength and the output voltage. Such linearity is irrespective of the winding of the detection winding 7 and has little relation to the waveform of the drive pulse. However, since the rise and fall of the current due to the number of turns of the winding 7 and the drive pulse are related to the level of the output voltage,
It is practical that the number of turns is 100 turns to 1,500 turns, the rise and fall speed (dA / dt) of the current is about 120 mA / μs to 750 mA / μs, and the peak value is about 20 mA to 150 mA. The length of the magnetic body 6 is set to about 10 mm to 100 mm, the cross-sectional area, because uneconomical when too large, In terms of economy, it is sufficient up to 0.28 mm 2 degree.
上記例においては、磁性体10の長さを100mmとした
が、磁性体10の長さを短かくすれば、前記線形性が向上
する傾向があり、磁性体10の長さ10mm程度であれば、磁
性体10の断面積が0.025mm2以上で前記0Oe〜0.3Oeの範囲
において線形性が得られることが確認された。In the above example, the length of the magnetic body 10 was set to 100 mm.However, if the length of the magnetic body 10 is shortened, the linearity tends to improve.If the length of the magnetic body 10 is about 10 mm, It was confirmed that when the cross-sectional area of the magnetic body 10 was 0.025 mm 2 or more, linearity was obtained in the range of 0 Oe to 0.3 Oe.
上記実施例は、アモルファス合金線の束線により磁性
体６を構成したので、表皮効果による抵抗増大を防止す
る上では有効であるが、第４図に示すように、前記１本
の磁性線6Aによって所定の断面積が得られれば、地磁気
程度の磁界強度においては出力電圧が飽和せず、１本の
磁性線を用いることも可能である。In the above embodiment, since the magnetic body 6 is constituted by a bundle of amorphous alloy wires, it is effective in preventing an increase in resistance due to the skin effect. However, as shown in FIG. Therefore, if a predetermined cross-sectional area is obtained, the output voltage does not saturate at a magnetic field strength about the earth magnetism, and it is possible to use one magnetic wire.
上記の磁界センサは、単体としても用いられるが、一
般的には、２本あるいは２組の磁性体を交差するように
組合わせて、各磁性体に巻かれた巻線の出力電圧の極性
と出力電圧の波高との組合わせから方位を検出する構成
として用いる。また、磁性体６としては、導電性があ
り、かつ高い透磁率で飽和磁束密度の大きな前記アモル
ファス合金の他、同様あるいは近い特性のものであれ
ば、他の材質のものを用いてもよい。また、磁性体６と
しては、線状のみならず、帯状のものを用いても良い。The above-mentioned magnetic field sensor is also used as a single unit. However, in general, two or two sets of magnetic bodies are combined so as to cross each other, and the polarity of the output voltage of the winding wound around each magnetic body is determined. It is used as a configuration for detecting the azimuth from a combination with the wave height of the output voltage. As the magnetic body 6, other than the above-mentioned amorphous alloy having conductivity and high magnetic permeability and high saturation magnetic flux density, other materials having similar or similar characteristics may be used. Further, as the magnetic body 6, not only a linear shape but also a band shape may be used.
さらに、本発明は、前記のような磁界強度において使
用されるものであれば、方位センサのみならず、非接触
型直流電流プローブ等にも使用できる。Further, the present invention can be used not only in the azimuth sensor but also in a non-contact DC current probe and the like as long as it is used in the above-mentioned magnetic field strength.
（発明の効果） 以上述べたように、本発明の磁界センサは、導電性を
有する磁性体にパルス電流等を流し、磁性体に巻回した
巻線により出力電圧を得るものであって、軽量、高感度
のものであり、廉価に提供できることは勿論のこと、磁
性体の断面積を0.025mm2〜0.28mm2としたので、地磁気
あるいは地磁気程度の磁界に対し、感度が高く、出力電
圧が飽和せず、磁界強度と出力電圧との関係に線形性が
得られる磁界センサを提供することができる。また、こ
のような線形性が得られるため、巻線の出力の処理回路
の構成を簡単化することができる。(Effect of the Invention) As described above, the magnetic field sensor according to the present invention is such that a pulse current or the like is applied to a conductive magnetic material and an output voltage is obtained by a winding wound around the magnetic material. are of high sensitivity, of course it can provide low cost, since the cross-sectional area of the magnetic body and 0.025mm 2 ~0.28mm 2, with respect to the magnetic field of the order of geomagnetism or the geomagnetism, sensitive, the output voltage It is possible to provide a magnetic field sensor that does not saturate and can obtain linearity in the relationship between the magnetic field strength and the output voltage. In addition, since such linearity is obtained, the configuration of the processing circuit for the output of the winding can be simplified.
第１図は本発明の磁界センサの一実施例を示す構成図、
第２図は本発明における入力電圧と出力電圧との関係の
一例を示す波形図、第３図は第１図の実施例において、
磁性体の本数を種々に変化させた場合の磁界強度と出力
電圧との関係図、第４図は本発明の他の実施例を示す構
成図、第５図および第６図は従来の磁界センサを示す構
成図、第７図は従来の磁界センサの原理図である。FIG. 1 is a configuration diagram showing one embodiment of a magnetic field sensor of the present invention,
FIG. 2 is a waveform diagram showing an example of the relationship between the input voltage and the output voltage in the present invention, and FIG.
FIG. 4 is a diagram showing the relationship between the magnetic field strength and the output voltage when the number of magnetic bodies is variously changed, FIG. 4 is a configuration diagram showing another embodiment of the present invention, and FIGS. 5 and 6 are conventional magnetic field sensors. FIG. 7 is a principle diagram of a conventional magnetic field sensor.
Claims (2)
と、該磁性体に長手方向にパルス電流あるいは交流電流
を流す手段と、該磁性体に巻回された検出巻線とを備え
ると共に、前記磁性体の断面積を0.025mm2〜0.28mm2と
したことを特徴とする磁界センサ。A linear or band-shaped magnetic material having conductivity, means for passing a pulse current or an alternating current to the magnetic material in a longitudinal direction, and a detection winding wound around the magnetic material. , the magnetic field sensor, characterized in that the cross-sectional area of the magnetic body and 0.025mm 2 ~0.28mm 2.
でなることを特徴とする請求項１記載の磁界センサ。2. The magnetic field sensor according to claim 1, wherein the magnetic body is formed by bundling a plurality of magnetic wires.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63214464A JP2582132B2 (en) | 1988-08-29 | 1988-08-29 | Magnetic field sensor |
| US07/287,153 US4939459A (en) | 1987-12-21 | 1988-12-21 | High sensitivity magnetic sensor |
| DE3843087A DE3843087C2 (en) | 1987-12-21 | 1988-12-21 | Magnetic field sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63214464A JP2582132B2 (en) | 1988-08-29 | 1988-08-29 | Magnetic field sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0262986A JPH0262986A (en) | 1990-03-02 |
| JP2582132B2 true JP2582132B2 (en) | 1997-02-19 |
Family
ID=16656162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63214464A Expired - Fee Related JP2582132B2 (en) | 1987-12-21 | 1988-08-29 | Magnetic field sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2582132B2 (en) |
-
1988
- 1988-08-29 JP JP63214464A patent/JP2582132B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0262986A (en) | 1990-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4357841B2 (en) | Magnetoelastic torque sensor | |
| EP0356171A2 (en) | Direct-coupled fluxgate current sensor and sensing method using the same | |
| US5757184A (en) | Magnetic field detection apparatus with bilateral electrical switch for inverting magnetic sensor current | |
| US4859944A (en) | Single-winding magnetometer with oscillator duty cycle measurement | |
| KR900014889A (en) | Relative displacement measuring device | |
| US4728888A (en) | Magnetometer with time coded output of measured magnetic fields | |
| KR950014895A (en) | DC current sensor | |
| JP2001281308A (en) | Magnetic sensor and position detector | |
| US4595022A (en) | Method for preventing remanence phenomena from interfering with magnetic field sensing systems and a device for implementation of the method | |
| US4963827A (en) | Intermittently activated magnetic shield arrangement for reducing noise and offsets in solid state magnetic field sensors | |
| US4739263A (en) | Magnetic sensor using the earth's magnetism | |
| JP2582132B2 (en) | Magnetic field sensor | |
| JP2582133B2 (en) | Magnetic field sensor | |
| US4733181A (en) | Single-winding magnetometer with Schmitt trigger output circuit | |
| JP2617498B2 (en) | Magnetic sensor | |
| Kashiwagi et al. | 300 A current sensor using amorphous wire core (invertor control of AC motors) | |
| JP3399185B2 (en) | Magnetic detection device and magnetic detection method | |
| JPH0778528B2 (en) | Magnetic sensor | |
| EP0990919A2 (en) | Magneto-Impedance effect element driving circuit | |
| SU495528A1 (en) | Electronic compass | |
| JP4053351B2 (en) | Geomagnetic direction sensor | |
| JP3746354B2 (en) | Magnetic field detector | |
| JPH0316070Y2 (en) | ||
| JPH01233318A (en) | Position detector | |
| JPH05312930A (en) | Magnetic-field detecting device using amorphous magnetic film |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |