JPH02302637A - Strain detecting apparatus - Google Patents
Strain detecting apparatusInfo
- Publication number
- JPH02302637A JPH02302637A JP1123312A JP12331289A JPH02302637A JP H02302637 A JPH02302637 A JP H02302637A JP 1123312 A JP1123312 A JP 1123312A JP 12331289 A JP12331289 A JP 12331289A JP H02302637 A JPH02302637 A JP H02302637A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- shield
- surface side
- shaped cross
- covers
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000035699 permeability Effects 0.000 claims abstract description 16
- 239000000696 magnetic material Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004907 flux Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002356 single layer Substances 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軸トルク等に
よる歪を検出する歪検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a strain detection device that detects strain caused by shaft torque of a passive shaft such as a rotating shaft.
第２図は従来の歪検出装置を示し、１はトルクを受ける
受動軸、２は受動軸１の中心軸、３．４は受動軸ｌの軸
受、５．６は高透磁率軟磁性材からなり、受動軸１の周
囲に＋４５度、−４５度の方向に固着された磁性層、７
は軸受３，４に支持されて受動軸１の周囲に配設された
コイルボビン、８．９はコイルボビン７に磁性層５．６
と対応して巻回された検出コイル、１０．１１は検出コ
イル８．９の周囲に設けられたＮｉ約８０％のＰＣパー
マロイからなるヨーク、１２はヨーク１０．１１の外周
に共通に設けられた非磁性シールドで、Ｃｕ。Fig. 2 shows a conventional strain detection device, where 1 is a passive shaft that receives torque, 2 is the center axis of the passive shaft 1, 3.4 is the bearing of the passive shaft 1, and 5.6 is made of high permeability soft magnetic material. magnetic layers 7 fixed around the passive axis 1 in directions of +45 degrees and -45 degrees;
8.9 is a coil bobbin supported by bearings 3 and 4 and arranged around the passive shaft 1, and 8.9 is a magnetic layer 5.6 on the coil bobbin 7.
10.11 is a yoke made of approximately 80% Ni PC permalloy provided around the detection coil 8.9, and 12 is commonly provided around the outer periphery of the yoke 10.11. Cu with non-magnetic shield.
Ｍなどの非磁性高導電率材から形成されている。It is made of a non-magnetic high conductivity material such as M.
１３は非磁性シールド１２の周囲に設けられた磁性シー
ルドで、ＰＣパーマロイなどの高透磁率軟磁性材から形
成されている。１４は検出コイル８゜９に接続された検
出回路である。A magnetic shield 13 is provided around the non-magnetic shield 12 and is made of a soft magnetic material with high magnetic permeability such as PC permalloy. 14 is a detection circuit connected to the detection coil 8.9.
次に、動作について説明する。受動軸１に外部からトル
クが印加されると、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。この歪により
透磁率が変・化し、引張力の場合と圧縮力の場１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の出力を入力され、受
動軸１の歪量に応じた検出電圧Ｖを出力する。ヨーク１
０．１１は検出コイル８，９から発生された磁束を集中
して通流させて磁束漏れを防ぎ、感度を増大させる。非
磁性シールド１２は非磁性高導電率材により形成されて
いるので交流磁束の表皮深さが非常に小さくなり、内部
磁束と外部磁束はこの非磁性シールド１２により磁気分
離され、内部磁束の漏れが防止されて感度が向上すると
ともに、外部磁界の侵入を防止して耐ノイズ性を向上さ
せている。又、磁性シールド１３は高透磁率軟磁性材に
より形成されており、主に外部直流磁界の侵入を防止す
る。Next, the operation will be explained. When torque is applied to the passive shaft 1 from the outside, a tensile force is generated on one side of the magnetic layer 5.6, and a compressive force is generated on the other side, causing distortion. The magnetic permeability changes due to this strain, and the magnetic permeability changes in opposite directions in the case of tensile force and in the case of compressive force. The detection coils 8 and 9 detect changes in magnetic permeability as changes in magnetic impedance, and the detection circuit 14 receives the outputs of each detection coil 8 and 9 and outputs a detection voltage V according to the amount of strain on the passive shaft 1. do. yoke 1
0.11 concentrates the magnetic flux generated from the detection coils 8 and 9, prevents magnetic flux leakage, and increases sensitivity. Since the non-magnetic shield 12 is made of a non-magnetic high conductivity material, the skin depth of the AC magnetic flux is extremely small, and the internal magnetic flux and external magnetic flux are magnetically separated by this non-magnetic shield 12, preventing leakage of the internal magnetic flux. This not only improves sensitivity by preventing the intrusion of external magnetic fields, but also improves noise resistance. The magnetic shield 13 is made of a soft magnetic material with high magnetic permeability, and mainly serves to prevent external DC magnetic fields from entering.
しかしながら、上記した従来装置においては、磁性シー
ルド１３が円筒状であったために軸方向からの外部直流
磁界の侵入を防止することができず、外部直流磁束が磁
性層５．６を通流してその動作点を移動させ、歪検出に
誤差が生じさせるという課題があった。However, in the conventional device described above, since the magnetic shield 13 is cylindrical, it is not possible to prevent the external DC magnetic field from entering from the axial direction, and the external DC magnetic flux flows through the magnetic layer 5.6. There was a problem in that the operating point was moved, causing an error in distortion detection.
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、軸方向からの外部直流磁界の侵入を防止し
て、耐ノイズ性が高く正確な歪検出々力が得られる歪検
出装置を得ることを目的とする。This invention was made to solve the above-mentioned problems, and is a strain detection method that prevents the intrusion of external DC magnetic fields from the axial direction and provides highly noise-resistant and accurate strain detection force. The purpose is to obtain equipment.
（”Ｊ題を解決するための手段〕
この発明に係る歪検出装置は、高透磁率軟磁性材からな
り、検出コイルの外周側をおおうとともに両端部が内周
側に突出した断面コ字状の磁性シールドを設けたもので
ある。(Means for Solving Problem J) The strain detection device according to the present invention is made of a high magnetic permeability soft magnetic material, covers the outer circumference of a detection coil, and has a U-shaped cross section with both ends protruding inward. It is equipped with a magnetic shield.
この発明における磁性シールドは断面コ字状となってお
り、外部直流磁界は径方向ばかりでなく軸方向において
もこの磁性シールドにより遮蔽される。The magnetic shield in this invention has a U-shaped cross section, and external DC magnetic fields are blocked by this magnetic shield not only in the radial direction but also in the axial direction.
以下、この発明の実施例を図面とともに説明する。第１
図はこの発明による歪検出装置の構成を示し、１５は高
透磁率軟磁性材からなり、ヨーク１０．１１の外周側を
おおうと共に、両端部に内周側に突出した突出部１５ａ
、１５ｂを有する断面コ字状の磁性シールドであり、軸
受３，４に支持されている。他の構成は従来と同じであ
る。Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows the configuration of a strain detection device according to the present invention, and 15 is made of a soft magnetic material with high magnetic permeability, and covers the outer circumferential side of the yoke 10.11, and protrusions 15a at both ends protrude inward.
, 15b, and is supported by bearings 3 and 4. Other configurations are the same as before.
上記構成において、磁性シールド１５は高透磁率軟磁性
材により断面コ字状に形成されているので、受動軸１の
径方向から侵入する外部直流磁界ばかりでなく、軸方向
から侵入する外部直流磁界も磁性シールド１５により遮
蔽される。このため、磁性層５．６の磁気動作点は移動
せず、歪検出誤差は生じない。In the above configuration, since the magnetic shield 15 is made of a high magnetic permeability soft magnetic material and has a U-shaped cross section, it is not only protected against external DC magnetic fields entering from the radial direction of the passive shaft 1, but also from external DC magnetic fields entering from the axial direction. is also shielded by the magnetic shield 15. Therefore, the magnetic operating point of the magnetic layer 5.6 does not move, and no strain detection error occurs.
第３図は磁気シールド１５の形成方法を示し、（ａ）図
では高透磁率軟磁性材を巻き込んで形成した円筒部１６
の両端に平板を積層して形成したドーナツ状部１７．１
８を接続して形成しており、（ロ）図では円筒部１６の
両端にやはり高透磁率軟磁性材を巻き込んで形成したド
ーナツ状部１９．２０を接続している。磁性シールド１
５は積層することにより、遮蔽効果が向上する。第３図
（Ｃ）では軸受３，４を高透磁率軟磁性材からなる磁性
軸受とし、この磁性軸受３．４を円筒部１６の両端に接
続して断面コ字状としている。FIG. 3 shows a method of forming the magnetic shield 15, and in FIG.
A donut-shaped portion 17.1 formed by laminating flat plates on both ends of the
8 are connected to each other, and in the figure (b), donut-shaped parts 19 and 20, which are also formed by rolling a high magnetic permeability soft magnetic material, are connected to both ends of the cylindrical part 16. magnetic shield 1
5 improves the shielding effect by stacking layers. In FIG. 3(C), the bearings 3 and 4 are magnetic bearings made of a soft magnetic material with high magnetic permeability, and the magnetic bearings 3.4 are connected to both ends of the cylindrical portion 16 so as to have a U-shaped cross section.
以上のようにこの発明によれば、検出コイルの外周側を
おおうと共に両端部が内周側に突出した断面コ字状の磁
性シールドを設けており、この磁性シールドの遮蔽効果
により受動軸の径方向及び軸方向からの外部直流磁界が
磁性シールド内に侵入せず、単性層の磁気的動作点が移
動しないために外部直流磁界による歪検出誤差は防止さ
れ、耐ノイズ性が向上する。As described above, according to the present invention, a magnetic shield is provided which covers the outer circumferential side of the detection coil and has a U-shaped cross section with both ends projecting toward the inner circumferential side, and the shielding effect of this magnetic shield allows the diameter of the passive shaft to be External DC magnetic fields from the axial and axial directions do not penetrate into the magnetic shield, and the magnetic operating point of the monolayer does not move, so distortion detection errors due to external DC magnetic fields are prevented and noise resistance is improved.
第１図はこの発明による歪検出装置の断面図、第２図は
従来袋！の断面図、第３図（ａ）〜（Ｃ）はこの発明に
よる磁性シールドの形成方法を示す断面図である。
１・・・受動軸、５．６・・・磁性層、８．９・・・検
出コイル、１５・・・磁性シールド、ｆ５ａ、１５ｂ・
・・突出部。
なお、図中同一符号は同−又は相当部分を示す。
第１図
１５ａ、Ｉ５ｂ ：突出部
業２ ズ
第３図
手続補正書
平
１、事件の表示 持願叫１−１２３３１２号２、発明
の名称
歪検出装置
３、補正をする者
代表者志岐守哉
５、補正の対象
６、 補正の内容
別紙の通り
７、 添付書類の目録
図 面 １
通販 上Fig. 1 is a sectional view of the strain detection device according to the present invention, and Fig. 2 is a conventional bag! 3A to 3C are cross-sectional views showing a method of forming a magnetic shield according to the present invention. 1... Passive axis, 5.6... Magnetic layer, 8.9... Detection coil, 15... Magnetic shield, f5a, 15b.
...Protrusion. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 15a, I5b: Outstanding Department 2 Figure 3 Procedural Amendment Document Hei 1, Indication of the incident Higashi-kyou 1-123312 No. 2, Name of the invention Distortion detection device 3, Representative of the person making the amendment Moriya Shiki 5. Subject of amendment 6. Contents of amendment as attached 7. Catalog of attached documents 1
Mail order top
Claims (1)
動軸の外周上に固着された磁性層と、磁性層の周囲に配
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、高透磁率軟磁性材からなり、
検出コイルの外周側をおおうとともに両端部が内周側に
突出した断面コ字状の磁性シールドを備えたことを特徴
とする歪検出装置。It consists of a passive shaft that receives an external force, a magnetic layer made of a high permeability soft magnetic material and fixed on the outer periphery of the passive shaft, and a magnetic layer that is arranged around the magnetic layer and has a magnetic permeability due to distortion in response to the external force. It consists of a detection coil that detects changes and a soft magnetic material with high magnetic permeability.
A strain detection device comprising a magnetic shield that covers the outer circumference of a detection coil and has a U-shaped cross section with both ends protruding inward.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1123312A JPH02302637A (en) | 1989-05-17 | 1989-05-17 | Strain detecting apparatus |
| KR1019900000804A KR930008305B1 (en) | 1989-04-27 | 1990-01-24 | Strain detector |
| DE4013429A DE4013429C2 (en) | 1989-04-27 | 1990-04-26 | Voltage detector |
| US07/514,801 US5062307A (en) | 1989-04-27 | 1990-04-26 | Strain detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1123312A JPH02302637A (en) | 1989-05-17 | 1989-05-17 | Strain detecting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02302637A true JPH02302637A (en) | 1990-12-14 |
Family
ID=14857433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1123312A Pending JPH02302637A (en) | 1989-04-27 | 1989-05-17 | Strain detecting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02302637A (en) |
-
1989
- 1989-05-17 JP JP1123312A patent/JPH02302637A/en active Pending
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