【発明の詳細な説明】［産業上の利用分野］本発明は軟磁性線材を集束して形成された磁性芯材に検
出コイルを巻回してなる自己発電型磁気センサに関する
。本発明の磁気センサは高感度磁気センサとして回転セ
ンサなどに使用することができる。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a self-power-generating magnetic sensor in which a detection coil is wound around a magnetic core material formed by converging soft magnetic wires. The magnetic sensor of the present invention can be used as a high-sensitivity magnetic sensor in rotation sensors and the like.
［従来の技術］従来、磁性芯材に検出コイルを巻回してなる自己発電型
磁気センサ（以下単に磁気センサという。[Prior Art] Conventionally, a self-power-generating magnetic sensor (hereinafter simply referred to as a magnetic sensor) is formed by winding a detection coil around a magnetic core material.
）が知られている。この磁気センサは第９図の斜視図お
よび第１０図の側面図に示すように、円形の断面形状を
もつように軟磁性線材１１１を集束して形成された磁性
芯材１００と、磁性芯材１００に巻回された検出コイル
２００とからなり、磁性芯材１００を貫通する磁束の変
化を検出コイル２００の誘導電圧により検出するもので
ある。)It has been known. As shown in the perspective view of FIG. 9 and the side view of FIG. 100, and a change in the magnetic flux passing through the magnetic core material 100 is detected by the induced voltage of the detection coil 200.
なお、磁性芯材１００を細い軟磁性線材１１１を集束し
て形成するのは磁性芯材１００の形状変更が簡単である
こと、高周波磁界測定時の渦電流損失を低減できること
、磁化しやすいアモルファスワイヤを使用できること、
などの理由のためである。The reason why the magnetic core material 100 is formed by converging thin soft magnetic wires 111 is that the shape of the magnetic core material 100 can be easily changed, eddy current loss during high-frequency magnetic field measurement can be reduced, and amorphous wire is easily magnetized. be able to use
This is for reasons such as.
［発明が解決しようとする問題点〕前記磁気センサはできる限り高い感度をもつことが期待
されている。感度向上の簡単な方法は検出コイルの巻回
数を増加することであるが、巻回数の増加には一定の限
界がある。またＡ磁性芯材恐を増加して磁気センサの感
度を改善することも可能であるが、比較的高価な磁性芯
材間の増加は杼済性に問題がある。[Problems to be Solved by the Invention] The magnetic sensor is expected to have as high a sensitivity as possible. An easy way to improve sensitivity is to increase the number of turns of the detection coil, but there is a certain limit to increasing the number of turns. It is also possible to improve the sensitivity of the magnetic sensor by increasing the number of A magnetic core materials, but increasing the number of relatively expensive magnetic core materials poses a problem in terms of ease of handling.
本発明は前記問題点に鑑みなされたものであって、検出
コイルの巻回数および磁性芯材間を増加せずに高感度化
された磁気センサを提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a magnetic sensor that is highly sensitive without increasing the number of windings of a detection coil or the distance between magnetic core materials.
［問題点を解決するための手段］本発明の磁気センサは、？！２＠の軟磁性線材を集束し
て形成された磁性芯材と前記磁性芯材に巻回された検出
コイルとからなる磁気センサにおいて、前記磁性芯材は
、偏平な断面形状をもつように構成されている。[Means for solving the problems] What is the magnetic sensor of the present invention? ! In a magnetic sensor comprising a magnetic core material formed by converging two soft magnetic wires and a detection coil wound around the magnetic core material, the magnetic core material is configured to have a flat cross-sectional shape. has been done.
軟磁性線材として、パーマロイやアモルファス合金など
の磁化されやすい高透磁率磁性材料を使用できる。As the soft magnetic wire, a high magnetic permeability magnetic material that is easily magnetized, such as permalloy or an amorphous alloy, can be used.
磁性芯材の偏平な断面形状は一方の幅がこれと直交する
他方の幅の１．２倍以上に形成されていることが望まし
い。It is desirable that the flat cross-sectional shape of the magnetic core material is formed such that one width is at least 1.2 times the width of the other perpendicular to the flat cross-sectional shape.
［作用］本発明の磁気センサが被検出磁界Ｈの中に置かれた場合
、軟磁性線材により構成される磁性芯材に磁束Φが発生
し、検出コイルには磁束Φの変化率に比例した誘導電圧
が発生する。[Operation] When the magnetic sensor of the present invention is placed in a magnetic field H to be detected, a magnetic flux Φ is generated in the magnetic core made of a soft magnetic wire, and a magnetic flux Φ is generated in the detection coil in proportion to the rate of change of the magnetic flux Φ. An induced voltage is generated.
特に本発明の偏平断面の磁性芯材は反磁界係数Ｎが円形
断面の！ｌ磁性芯材りも小さいので、周間の軟磁性線材
で構成された従来の円形断面の磁性芯材に比較して、よ
り多くの磁束を発生させ、検出コイルにより大きな出力
電圧を発゛生させる。In particular, the magnetic core material with a flat cross section of the present invention has a demagnetizing field coefficient N of a circular cross section! l Since the magnetic core material is small, it generates more magnetic flux and generates a larger output voltage from the detection coil compared to the conventional circular cross-section magnetic core material made of soft magnetic wire around the circumference. let
［実施例］本発明の一実施例を図面により説明する。第１図は本実
施例の磁気センサ１０の平面図、第２図はその側面図、
第３図は磁気センサ１０を回転センサとして使用した場
合の模式図である。[Example] An example of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the magnetic sensor 10 of this embodiment, FIG. 2 is a side view thereof,
FIG. 3 is a schematic diagram when the magnetic sensor 10 is used as a rotation sensor.
本磁気センサ１０は、磁性芯材１と、磁性芯材１を収納
する樹脂管３と、樹脂管３の軸方向中央部に巻回された
検出コイル２と、からなる。樹脂管３は非磁性材料の管
なら何でも良くオーステナイト系ステンレスや非鉄金属
の管でもよい。磁性芯材１は樹脂管３内に軸方向に並製
された数十本以上のアモルファスワイヤ１１により構成
されている。各アモルファスワイヤ１１は約０．１ｍｍ
の直径と約３０ｍｍの長さとをもつＣＯベースの軟磁性
線材である。磁性血相１の断面形状の短幅ｄ１は約０．
４ｍｍであり、その長幅ｄ２は約３・１ｍｍである。樹
脂管３は約０．２５ｍｍの管厚と約３０ｍｍの管長とを
もつポリエチレン樹脂製の管である。検出コイル２は絶
縁被覆されたＣｕワイヤを樹脂管３に約４５００回巻回
して形成されている。The present magnetic sensor 10 includes a magnetic core material 1, a resin tube 3 housing the magnetic core material 1, and a detection coil 2 wound around the axial center of the resin tube 3. The resin tube 3 may be any tube made of non-magnetic material, and may also be a tube made of austenitic stainless steel or non-ferrous metal. The magnetic core material 1 is composed of dozens or more amorphous wires 11 arranged in parallel in the axial direction inside the resin tube 3. Each amorphous wire 11 is approximately 0.1 mm
It is a CO-based soft magnetic wire with a diameter of approximately 30 mm and a length of approximately 30 mm. The short width d1 of the cross-sectional shape of the magnetic blood phase 1 is approximately 0.
4 mm, and its long width d2 is approximately 3.1 mm. The resin tube 3 is made of polyethylene resin and has a thickness of about 0.25 mm and a length of about 30 mm. The detection coil 2 is formed by winding an insulated Cu wire around a resin tube 3 approximately 4,500 times.
磁気センサ１０の使用例を第３図に示す。回転センサと
して使用される磁気センサ１０は回転体４の周辺に配置
され、回転体４には磁石５が埋設されている。磁石５の
回転により、磁気センサ１０の検出コイル２には誘導電
圧が発生する。An example of how the magnetic sensor 10 is used is shown in FIG. A magnetic sensor 10 used as a rotation sensor is arranged around the rotating body 4, and a magnet 5 is embedded in the rotating body 4. Due to the rotation of the magnet 5, an induced voltage is generated in the detection coil 2 of the magnetic sensor 10.
本実施例の磁気センサ１０は第７図および第８図に示す
従来の磁気セン→ノ°に比較して、もし検出コイルの巻
回数が同じであり磁性芯材間が同じであればより大きな
出力電圧を発生することができる。The magnetic sensor 10 of this embodiment has a larger magnetic sensor than the conventional magnetic sensor shown in FIGS. can generate an output voltage.
その理由は、本実施例の磁気センサ１０の断面形状が偏
平であるので、磁性芯材１の長さ方向（Ｗ４化方向ｙ）
への反磁界係数（Ｈｙと称する）が小さくなり、検出コ
イル２と鎖交する磁束Φが増加するからである。The reason is that since the cross-sectional shape of the magnetic sensor 10 of this embodiment is flat, the length direction of the magnetic core material 1 (W4 direction y)
This is because the demagnetizing field coefficient (referred to as Hy) becomes smaller, and the magnetic flux Φ interlinking with the detection coil 2 increases.
磁性芯材の断面形状の変更による磁気センサの出力電圧
の変化を調べた実験結果を以下め第１表に示す。ただし
、以下の実験においｔ使用される各磁性芯材はそれぞれ
直径０．１２ｍｍのアモルファスワイヤを５０本集束し
て形成したもめである。被測定磁界（印加磁界） ｊ、
を直径１２．５ｍｍのソレノイドに６０Ｈｚの交流電圧
を印加して形成され、前記各磁性芯材に巻回された検出
コイルの巻回数はそれぞれ４５００回である。Table 1 below shows the results of an experiment in which changes in the output voltage of the magnetic sensor due to changes in the cross-sectional shape of the magnetic core material were investigated. However, each magnetic core material used in the following experiments was formed by converging 50 amorphous wires each having a diameter of 0.12 mm. Magnetic field to be measured (applied magnetic field) j,
was formed by applying an alternating current voltage of 60 Hz to a solenoid having a diameter of 12.5 mm, and the number of windings of the detection coils wound around each of the magnetic core materials was 4,500.
（以下余白）第 １ 表ここに、試料Ａは直径１．２ｍｍの円形断面をもつ磁性
芯材を使用した磁気センサであり、試料Ｂは短幅０．５
ｍｍ１艮幅２．５ｍｍの偏平断面をもつ磁性芯材を使用
した磁気センサであり、試料Ｃは短幅Ｑ、４ｍｍ、長幅
３．１ｍｒｒｌ）［ｉ平断面をもつ磁性芯材を使用した
磁気センサである。(Margin below) Table 1 Here, sample A is a magnetic sensor using a magnetic core material with a circular cross section with a diameter of 1.2 mm, and sample B is a magnetic sensor with a short width of 0.5 mm.
This is a magnetic sensor using a magnetic core material with a flat cross section with a width of 2.5 mm, and sample C has a short width Q of 4 mm and a long width of 3.1 mrrl. It is a sensor.
ただし、各試料の磁性芯材の長さは等しい。However, the length of the magnetic core material of each sample is the same.
更に前記試料Ａおよび試料Ｃを、回転体４に設置された
永久磁石５から所定距離りだけ離れて配置した場合のそ
れぞれの検出コイルの出力電圧を第２表に示す。ただし
、実験例ａは第４図の（ａ）に示すように試料Ｂの磁性
芯材を回転体の周面に対して横置き状に配置した場合で
あり、実験例すは第４図の（ｂ）に示すように試料Ｃの
磁性芯材を同じく縦置き状に配置した場合であり、実験
例Ｃは第４図の（Ｃ）に示すように試料への磁性芯材を
使用した場合である。なお、回転体４の直径は約１００
ｍであり、その回転速度は約１６Ｏｒｐｍである。Further, Table 2 shows the output voltages of the respective detection coils when the samples A and C are placed a predetermined distance apart from the permanent magnet 5 installed on the rotating body 4. However, experimental example a is a case where the magnetic core material of sample B is placed horizontally with respect to the circumferential surface of a rotating body as shown in FIG. As shown in (b), this is the case where the magnetic core material of Sample C is also arranged vertically, and Experimental Example C is the case where the magnetic core material is used for the sample as shown in (C) of Figure 4. It is. Note that the diameter of the rotating body 4 is approximately 100 mm.
m, and its rotational speed is about 16 Orpm.
第 ２ 表前記実験結果かられかるように、磁性芯材量が等しく検
、出コイルの巻回数が等しくても偏平１Ｉ７ｉ面をもつ
磁性芯材を使用することにより、磁気センサの出力感度
を改善することができる。Table 2 As can be seen from the above experimental results, the output sensitivity of the magnetic sensor is improved by using a magnetic core material with a flat 1I7i surface even if the amount of magnetic core material is equal in detection and the number of windings of the output coil is equal. can do.
また本実施例の磁気センサ１０によれば、磁性芯材１の
短幅方向の長さを短縮できるので、従来の磁気センサに
比べて設２の自由度が増える。Furthermore, according to the magnetic sensor 10 of this embodiment, the length of the magnetic core material 1 in the short width direction can be shortened, so that the degree of freedom in the installation 2 is increased compared to the conventional magnetic sensor.
また、本実施例の磁気センサは第５図の正面図、第６図
の側面図に示すようにアモルファスワイヤで構成された
磁性芯材１をその端部で曲げることにより、センサ全長
は短いまま、更に微弱な磁界を測定することができる。Furthermore, as shown in the front view of FIG. 5 and the side view of FIG. , it is possible to measure even weaker magnetic fields.
これは、従来の円形断面の磁性芯材１００に比較して、
本実施例のような偏平な断面の磁性芯材１はその短幅方
向への曲げ剛性が小さいからである。This is compared to the conventional magnetic core material 100 having a circular cross section.
This is because the magnetic core material 1 having a flat cross section as in this embodiment has low bending rigidity in the short width direction.
なお、磁性芯材１を曲げるにはアモルファスワイヤ１１
を樹脂管３に装填した侵で、樹脂管３を熱変形させるよ
うにしてもよい。Note that in order to bend the magnetic core material 1, an amorphous wire 11 is used.
The resin tube 3 may be thermally deformed by loading the resin tube 3 with the resin.
［発明の効果］以上説明したように、本発明の磁気センサの磁性芯材は
、その断面が偏平状に形成されているので、従来の円形
断面の磁性芯材をもつ磁気センサに比べて、反磁界係数
が小さく、出力感度を改善できる。更に本発明の磁気セ
ンサは磁性芯材を曲げやすいので、特定部位の磁界強度
の測定にも有利である。[Effects of the Invention] As explained above, since the magnetic core material of the magnetic sensor of the present invention has a flat cross section, compared to a conventional magnetic sensor having a magnetic core material with a circular cross section, The demagnetizing field coefficient is small and the output sensitivity can be improved. Furthermore, since the magnetic sensor of the present invention has a magnetic core material that is easy to bend, it is also advantageous for measuring the magnetic field strength at a specific location.
第１図は本発明の磁気センサの一実施例を示す平面図、
第２図は同側面図、第３図は本発明の磁気センサの使用
例を示す模式図、第４図は磁性芯材１の配置例を示す模
式図である。第５図は磁性芯材の端部が曲げられている
実ｍ態様を示す磁気センサの正面図であり、第６図はそ
の側面図である。第７図は従来の磁気センサの模式図で
あり、第８図はその側面図である。１・・・磁性芯材２・・・検出コイル１１・・・アモルファスワイヤ特許出願人 株式会社豊田自動織機製作所同 ユニ
チカ株式会社FIG. 1 is a plan view showing an embodiment of the magnetic sensor of the present invention;
2 is a side view of the same, FIG. 3 is a schematic diagram showing an example of the use of the magnetic sensor of the present invention, and FIG. 4 is a schematic diagram showing an example of the arrangement of the magnetic core material 1. FIG. 5 is a front view of a magnetic sensor showing an actual state in which the end portion of the magnetic core material is bent, and FIG. 6 is a side view thereof. FIG. 7 is a schematic diagram of a conventional magnetic sensor, and FIG. 8 is a side view thereof. 1... Magnetic core material 2... Detection coil 11... Amorphous wire Patent applicant Toyota Industries Corporation Unitika Corporation
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31575787AJPH01155282A (en) | 1987-12-14 | 1987-12-14 | Magnetic sensor |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31575787AJPH01155282A (en) | 1987-12-14 | 1987-12-14 | Magnetic sensor |
| Publication Number | Publication Date |
|---|---|
| JPH01155282Atrue JPH01155282A (en) | 1989-06-19 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31575787APendingJPH01155282A (en) | 1987-12-14 | 1987-12-14 | Magnetic sensor |
| Country | Link |
|---|---|
| JP (1) | JPH01155282A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07280774A (en)* | 1994-03-30 | 1995-10-27 | Inst Dr F Foerster Pruefgeraet Gmbh | High-resolution eddy current probe |
| US5751112A (en)* | 1994-12-22 | 1998-05-12 | Sumitomo Metal Mining Co., Ltd. | CRT magnetic compensating circuit with parallel amorphous wires in the sensor |
| WO2000022447A1 (en)* | 1998-10-14 | 2000-04-20 | Tdk Corporation | Magnetic sensor, current sensor, and magnetic sensor element |
| US6805588B2 (en) | 2000-02-03 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Cable connector |
| CN104698402A (en)* | 2015-03-03 | 2015-06-10 | 江西飞尚科技有限公司 | Ribbon cable detection method for magnetic flux of open loop magnetic flux sensor |
| CN105008866A (en)* | 2012-12-20 | 2015-10-28 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Sensor for detecting the position of a generator element |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4880075A (en)* | 1972-01-17 | 1973-10-26 | ||
| JPS5216775U (en)* | 1975-07-25 | 1977-02-05 | ||
| JPS59226882A (en)* | 1983-06-09 | 1984-12-20 | Showa Denko Kk | Magnetic signal converting element |
| JPS61215974A (en)* | 1985-03-22 | 1986-09-25 | Kawatetsu Techno Res Kk | Magnetic core for magnetic sensor |
| JPS6145717B2 (en)* | 1983-06-17 | 1986-10-09 | Kyoei Hooningu Kk |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4880075A (en)* | 1972-01-17 | 1973-10-26 | ||
| JPS5216775U (en)* | 1975-07-25 | 1977-02-05 | ||
| JPS59226882A (en)* | 1983-06-09 | 1984-12-20 | Showa Denko Kk | Magnetic signal converting element |
| JPS6145717B2 (en)* | 1983-06-17 | 1986-10-09 | Kyoei Hooningu Kk | |
| JPS61215974A (en)* | 1985-03-22 | 1986-09-25 | Kawatetsu Techno Res Kk | Magnetic core for magnetic sensor |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07280774A (en)* | 1994-03-30 | 1995-10-27 | Inst Dr F Foerster Pruefgeraet Gmbh | High-resolution eddy current probe |
| US5751112A (en)* | 1994-12-22 | 1998-05-12 | Sumitomo Metal Mining Co., Ltd. | CRT magnetic compensating circuit with parallel amorphous wires in the sensor |
| WO2000022447A1 (en)* | 1998-10-14 | 2000-04-20 | Tdk Corporation | Magnetic sensor, current sensor, and magnetic sensor element |
| US6805588B2 (en) | 2000-02-03 | 2004-10-19 | Matsushita Electric Industrial Co., Ltd. | Cable connector |
| CN105008866A (en)* | 2012-12-20 | 2015-10-28 | 大陆-特韦斯贸易合伙股份公司及两合公司 | Sensor for detecting the position of a generator element |
| US10690516B2 (en) | 2012-12-20 | 2020-06-23 | Continental Teves Ag & Co. Ohg | Protective compound-enveloped sensor for detecting the position of an encoder element |
| CN104698402A (en)* | 2015-03-03 | 2015-06-10 | 江西飞尚科技有限公司 | Ribbon cable detection method for magnetic flux of open loop magnetic flux sensor |
| Publication | Publication Date | Title |
|---|---|---|
| JP4917662B2 (en) | Force sensor device | |
| US4891992A (en) | Torque detecting apparatus | |
| JPH01187424A (en) | Torque sensor | |
| JP2001330655A (en) | Magnetic sensor and its manufacturing method | |
| JPS6132619B2 (en) | ||
| JP3580905B2 (en) | Magnetic sensor | |
| US20050062573A1 (en) | Non-contact magnetically variable differential transformer | |
| JPH01155282A (en) | Magnetic sensor | |
| JPH04331301A (en) | Measuring apparatus for determining angle of rotation | |
| JPS61153535A (en) | torque meter | |
| WO2002059555A1 (en) | Portable magnetic transducer | |
| JPH09210610A (en) | High-frequency excitation differential transformer for preventing influence of external magnetism and metal, etc. | |
| JPS5946526A (en) | electromagnetic stress sensor | |
| JPH01318901A (en) | Magnetic induction type sensor | |
| JP3515233B2 (en) | DC current sensor | |
| JP2566640B2 (en) | Torque measuring device | |
| JP3618425B2 (en) | Magnetic sensor | |
| JPS59192930A (en) | Torque detection method | |
| JPH1038714A (en) | Torque measuring apparatus and paper currency feeding mechanism employing it | |
| KR101301286B1 (en) | Solenoid magnetometer | |
| JP4128651B2 (en) | Magnetic sensor | |
| JPH11208320A (en) | Trolley wire tension measuring device | |
| JP2002116242A (en) | Magnetic detecting device | |
| JP3130115B2 (en) | Tube Magnetostrictive Stress Measurement Method and Apparatus | |
| JPH03297215A (en) | Magneto-sensitive pulse generator using coaxial cylindrical composite magnetic body |