JPH02281114A - Strain detector - Google Patents
Strain detectorInfo
- Publication number
- JPH02281114A JPH02281114A JP1102821A JP10282189A JPH02281114A JP H02281114 A JPH02281114 A JP H02281114A JP 1102821 A JP1102821 A JP 1102821A JP 10282189 A JP10282189 A JP 10282189A JP H02281114 A JPH02281114 A JP H02281114A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- layer
- layers
- detection coil
- gap
- 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
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims description 31
- 230000004323 axial length Effects 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 8
- 230000004907 flux Effects 0.000 abstract description 23
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 230000002500 effect on skin Effects 0.000 abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 13
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
この発明は、例えば回転軸などの受動軸の歪を検出する
歪検出器に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a strain detector that detects strain in a passive shaft such as a rotating shaft.
第２図は従来装置の構成を示し、１は回転軸からなる受
動軸、２は受動軸１の中心軸、３４は受動軸１を回転自
在に支持する軸受である。受動軸１の外周面上には軸方
向に間隔をあげて高透磁率軟磁性材からなる第１及び第
２の磁性層５，６が固着される。第１の磁性層５は中心
軸２に対して＋４５度方向に、第２の磁性層６は中心軸
２に対して一４５度方向にそれぞれ複数条細長く形成さ
れている。又、各磁性層５．６の外周には円筒状のコイ
ルボビン７が受動軸１と同軸状に配設される。コイルポ
ビン７には磁性層５，６に対応して第１及び第２の検出
コイル８．９が巻装され、各検出コイル８．９は検出回
路１４に接続されている。１０．１１は検出コイル８．
９の周囲に設けられた高透磁率軟磁性材からなる磁気収
束層である。FIG. 2 shows the configuration of a conventional device, where 1 is a passive shaft consisting of a rotating shaft, 2 is a central axis of the passive shaft 1, and 34 is a bearing that rotatably supports the passive shaft 1. First and second magnetic layers 5 and 6 made of a high magnetic permeability soft magnetic material are fixed on the outer peripheral surface of the passive shaft 1 at a distance in the axial direction. The first magnetic layer 5 is formed in a plurality of strips in a direction of +45 degrees with respect to the central axis 2, and the second magnetic layer 6 is formed in a plurality of strips in a direction of -45 degrees with respect to the central axis 2. Further, a cylindrical coil bobbin 7 is disposed coaxially with the passive shaft 1 on the outer periphery of each magnetic layer 5.6. First and second detection coils 8.9 are wound around the coil pobin 7 in correspondence with the magnetic layers 5, 6, and each detection coil 8.9 is connected to a detection circuit 14. 10.11 is the detection coil 8.
9 is a magnetic convergence layer made of a high permeability soft magnetic material.
上記構成において、受動軸１に外部からトルクが印加さ
れると、各磁性層５，６の一方に引張力が発生し、他方
に圧縮力が発生して歪が生じる。In the above configuration, when torque is applied to the passive shaft 1 from the outside, a tensile force is generated in one of the magnetic layers 5 and 6, and a compressive force is generated in the other, resulting in distortion.
この歪発生に応じてその透磁率が変化し、引張力による
場合と圧縮力による場合では透磁率が逆方向に変化する
。検出コイル８．９は透磁率の変化を磁気的インピーダ
ンスの変化として検出し、検出回路１４は各検出コイル
８，９の出力を差動増幅し、受動軸１の歪量に応じた検
出電圧■を出力する。The magnetic permeability changes in accordance with the occurrence of this strain, and the magnetic permeability changes in opposite directions depending on whether the tensile force is applied or the compressive force is applied. The detection coils 8 and 9 detect changes in magnetic permeability as changes in magnetic impedance, and the detection circuit 14 differentially amplifies the outputs of each detection coil 8 and 9 to generate a detection voltage according to the amount of distortion of the passive shaft 1. Output.
第３図（ａ）、（ハ）は上記した従来装置の磁気回路図
及びその電気的等価回路図を示し、検出コイル８゜９へ
の通電により発生した磁束のうち、Ｆ９＋Ｆ’９は検出
コイル８，９と磁性層５，６とのギャップを通る磁束、
Ｆｅｆｆは磁性層５，６を通る磁束、Ｆｓは受動軸１を
通る磁束を示す。磁気収束層１０゜１１は高透磁率であ
るので検出コイル８，９の外周側では磁束Ｆ、、Ｆ、□
、Ｆ５はすべて磁気収束層１０．１１を通る。又、電流
Ｉ −、Ｉ −ｔｔ、 Ｔ −は磁束Ｆ、とＦ′９、
Ｆａｆｆ＋ＦＳを変換したものであり、電圧Ｅは検出コ
イル８．９の起磁力に対応する。又、Ｒ＊ ＋ Ｒ＊
ｔ ｔ ＋ Ｒｓ はそれぞれギャップ、磁性層５
．６及び受動軸１の磁気抵抗であり、Ｒ１１Ｘは検出コ
イル８．９の外周側での磁気抵抗である。Figures 3(a) and (c) show the magnetic circuit diagram and its electrical equivalent circuit diagram of the conventional device described above, in which F9+F'9 is the magnetic flux generated by energizing the detection coil 8°9. Magnetic flux passing through the gap between 8 and 9 and the magnetic layers 5 and 6,
Feff indicates the magnetic flux passing through the magnetic layers 5 and 6, and Fs indicates the magnetic flux passing through the passive shaft 1. Since the magnetic convergence layers 10゜11 have high magnetic permeability, the magnetic fluxes F, , F, □ on the outer periphery of the detection coils 8 and 9
, F5 all pass through the magnetic focusing layer 10.11. Also, the currents I −, I −tt, and T − are magnetic fluxes F, and F′9,
This is a conversion of Faff+FS, and the voltage E corresponds to the magnetomotive force of the detection coil 8.9. Also, R* + R*
t t + Rs are the gap and the magnetic layer 5, respectively.
．． 6 and the magnetic resistance of the passive shaft 1, and R11X is the magnetic resistance on the outer peripheral side of the detection coil 8.9.
さらに、磁気収束層１０．１１の磁気抵抗ＲｙがＲＱＸ
と並列に挿入される。従って、この磁気抵抗Ｒ，が小さ
いので総電流Ｉが大きくなり、磁束Ｆｅｅｔ も大きく
なって感度が上昇する。Furthermore, the magnetoresistance Ry of the magnetic convergence layer 10.11 is RQX
is inserted in parallel with Therefore, since this magnetic resistance R, is small, the total current I becomes large, the magnetic flux Feet also becomes large, and the sensitivity increases.
しかしながら、上記した従来装置においては、磁性層５
．６を通らず歪検出に貢献しない磁束１？、。However, in the conventional device described above, the magnetic layer 5
．． Magnetic flux 1 that does not pass through 6 and does not contribute to strain detection? ,.
Ｆ’、、Ｆ、が比較的大きな割合で存在し、充分な歪検
出感度が得られないという課題があった。There was a problem that F',,F, existed in a relatively large proportion and sufficient strain detection sensitivity could not be obtained.
この発明は上記のような課題を解決するために成された
ものであり、磁性層を通る磁束を増大して感度を向上す
ることができる歪検出器を得ることを目的とする。The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a strain detector that can increase the magnetic flux passing through the magnetic layer and improve the sensitivity.
この発明の請求項１に係る歪検出器は、磁性層と検出コ
イルの間のギャップに非磁性高導電率の金属層を設けた
ものである。The strain detector according to claim 1 of the present invention is one in which a nonmagnetic high conductivity metal layer is provided in the gap between the magnetic layer and the detection coil.
この発明の請求項２に係る歪検出器は、上記金属層の軸
方向長さを検出コイルの軸方向長さより短かくしたもの
である。In the strain detector according to a second aspect of the present invention, the axial length of the metal layer is shorter than the axial length of the detection coil.
この発明においては、金属層が非磁性高導電率であるた
めに、検出コイルから発生した磁束のうち、金属層と検
出コイルの間のギャップを通流しようとする磁束は金属
層の表皮効果によりその通流を妨げられ、磁性層を通る
ようになる。又、上記ギャップを短かい回路で通流しよ
うとする磁束も金属層の軸方向長さが検出コイルより短
かいので、この金属層により有効に通流を妨げられる。In this invention, since the metal layer is non-magnetic and highly conductive, out of the magnetic flux generated from the detection coil, the magnetic flux that attempts to flow through the gap between the metal layer and the detection coil is due to the skin effect of the metal layer. Its flow is blocked and passes through the magnetic layer. Further, since the axial length of the metal layer is shorter than the detection coil, the magnetic flux that attempts to flow through the gap in a short circuit is effectively prevented from flowing by the metal layer.
以下、この発明の実施例を図面とともに説明する。第１
図はこの発明の第１の実施例による歪検出器の構成を示
し、１２．１３は銅やアルミ等の非磁性高導電率材から
成る第１及び第２の金属層で、コイルボビン７における
検出コイル８．９の内周側に磁性層５，６と対応して設
けられる。円筒状の金属層１２．１３の軸方向長さは、
同じく円筒状の検出コイル８，９の軸方向長さより短か
くしである。他の構成は従来と同様である。Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows the configuration of a strain detector according to the first embodiment of the present invention, and 12 and 13 are first and second metal layers made of non-magnetic high conductivity material such as copper or aluminum, and are used for detection in the coil bobbin 7. It is provided on the inner peripheral side of the coil 8.9 in correspondence with the magnetic layers 5 and 6. The axial length of the cylindrical metal layer 12.13 is
The comb is shorter than the length in the axial direction of the detection coils 8 and 9, which are also cylindrical. The other configurations are the same as before.
第４図（ａ）、Φ）は第１図の歪検出器の磁気回路図及
びその電気的等価回路図を示す。金属層１２゜１３は非
磁性高導電率であるから表皮効果により交流磁束の浸透
深さが非常に浅くなる。従って、検出コイル８．９から
発生した磁束のうち、検出コイル８．９と磁性層５．６
とのギャップを通っていた磁束Ｆｇ、Ｆ’、は金属層１
２．１３があるために磁束Ｆ’ｅｆｆ として磁性層５
．６を通るようになり、感度が向上する。特に、金属層
１２．１３の軸方向長さを検出コイル８．９より短かく
したので、小さな閉回路で流れる磁束Ｆ１９を大きな閉
回路で流れるようにしてＦ’ｅｔｆ として磁性層５゜
６を通るようにするために有効である。FIG. 4(a), Φ) shows a magnetic circuit diagram of the strain detector of FIG. 1 and its electrical equivalent circuit diagram. Since the metal layers 12 and 13 are non-magnetic and highly conductive, the penetration depth of the alternating current magnetic flux becomes very shallow due to the skin effect. Therefore, out of the magnetic flux generated from the detection coil 8.9, the detection coil 8.9 and the magnetic layer 5.6
The magnetic flux Fg, F', which passed through the gap between metal layer 1
2.13, the magnetic flux F'eff is the magnetic layer 5
．． 6, and the sensitivity improves. In particular, since the axial length of the metal layer 12.13 is made shorter than the detection coil 8.9, the magnetic flux F19 flowing in a small closed circuit is made to flow in a large closed circuit, and the magnetic layer 5.6 is used as F'etf. It is effective for making it easier to pass.
第５図（ａ）、（ロ）はこの発明の第２の実施例による
歪検出器の磁気回路図及び電気的等価回路図を示し、こ
の例では金属層１２．１３を磁性層５．６の外周面上に
設けており、他の構成は第１の実施例と同様である。こ
の例においても金属層１２１３の表皮効果により磁束Ｆ
９．Ｆ’９が磁束Ｆ′ｅ□として磁性層５，６を通るよ
うになり、感度が向上する。FIGS. 5(a) and 5(b) show a magnetic circuit diagram and an electrical equivalent circuit diagram of a strain detector according to a second embodiment of the present invention. In this example, the metal layer 12.13 is replaced with the magnetic layer 5.6. The other configuration is the same as that of the first embodiment. In this example as well, the magnetic flux F due to the skin effect of the metal layer 1213
9. F'9 passes through the magnetic layers 5 and 6 as magnetic flux F'e□, improving sensitivity.
以上のようにこの発明によれば、磁性層と検出コイルの
間に非磁性高導電率の金属層を設けたので、このギャッ
プを通流しようとする磁束は金属層の表皮効果によりそ
の通流を妨げられて磁性層を通るようになり、歪検出感
度が向上する。又、金属層の軸方向長さを検出コイルよ
り短かくしたので、上記ギャップを小回りに通流しよう
とする磁束も金属層により有効に妨げられて磁性層を通
るようになり、−層感度が向上する。As described above, according to the present invention, since a nonmagnetic high conductivity metal layer is provided between the magnetic layer and the detection coil, the magnetic flux that attempts to flow through this gap is caused by the skin effect of the metal layer. is prevented from passing through the magnetic layer, improving strain detection sensitivity. In addition, since the axial length of the metal layer is made shorter than the detection coil, the magnetic flux that attempts to flow through the gap in a small direction is effectively blocked by the metal layer and passes through the magnetic layer, which reduces the layer sensitivity. improves.
第１図はこの発明の第１の実施例による歪検出器の構成
図、第２図は従来の歪検出器の構成図、第３図（ａ）、
（ｂ）は従来の歪検出器の磁気回路図及び電気的等価
回路図、第４図（ａ）、 （ｂ）はこの発明の第１の実
施例による歪検出器の磁気回路図及び電気的等価回路図
、第５７ （ａ） 、 （ｂ）はこの発明の第２の実施
例による歪検出器の磁気回路図及び電気的等価回路図で
ある。
■・・・受動軸、５．６・・・磁性層、８，９・・・検
出コイル、１２．１３・・・金属層。
なお、
図中同一符号は同−又は相当部分を示す。FIG. 1 is a configuration diagram of a distortion detector according to a first embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional distortion detector, and FIG.
(b) is a magnetic circuit diagram and an electrical equivalent circuit diagram of a conventional strain detector, and FIGS. Equivalent circuit diagrams No. 57 (a) and (b) are a magnetic circuit diagram and an electrical equivalent circuit diagram of a distortion detector according to a second embodiment of the present invention. ■... Passive axis, 5.6... Magnetic layer, 8, 9... Detection coil, 12.13... Metal layer. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (2)
された高透磁率軟磁性の磁性層と、磁性層の周囲にギャ
ップを隔てて配設され、磁性層の上記外力に応じた歪に
よる透磁率変化を検出する検出コイルと、磁性層と検出
コイルの間のギャップに設けられた非磁性高導電率の金
属層を備えたことを特徴とする歪検出器。(1) A passive shaft that receives an external force, a high permeability soft magnetic magnetic layer fixed on the outer circumferential surface of the passive shaft, and a magnetic layer that is arranged around the magnetic layer with a gap, and that responds to the external force of the magnetic layer. 1. A strain detector comprising: a detection coil for detecting changes in magnetic permeability due to strain; and a non-magnetic high conductivity metal layer provided in a gap between the magnetic layer and the detection coil.
さより短かくしたことを特徴とする請求項１記載の歪検
出器。(2) The strain detector according to claim 1, wherein the axial length of the metal layer is shorter than the axial length of the detection coil.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102821A JPH02281114A (en) | 1989-04-22 | 1989-04-22 | Strain detector |
| KR1019900004873A KR930011088B1 (en) | 1989-04-22 | 1990-04-10 | Twist detector |
| DE4011766A DE4011766C2 (en) | 1989-04-22 | 1990-04-11 | Voltage sensor |
| US07/509,798 US5036713A (en) | 1989-04-22 | 1990-04-17 | Strain detector |
| US07/695,007 US5092182A (en) | 1989-04-22 | 1991-05-03 | Strain detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1102821A JPH02281114A (en) | 1989-04-22 | 1989-04-22 | Strain detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02281114A true JPH02281114A (en) | 1990-11-16 |
Family
ID=14337688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1102821A Pending JPH02281114A (en) | 1989-04-22 | 1989-04-22 | Strain detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02281114A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545538U (en) * | 1991-11-22 | 1993-06-18 | 日本電子機器株式会社 | Magnetostrictive torque sensor |
-
1989
- 1989-04-22 JP JP1102821A patent/JPH02281114A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545538U (en) * | 1991-11-22 | 1993-06-18 | 日本電子機器株式会社 | Magnetostrictive torque sensor |
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