JPH0346512A - Displacement measuring device - Google Patents
Displacement measuring deviceInfo
- Publication number
- JPH0346512A JPH0346512A JP18222589A JP18222589A JPH0346512A JP H0346512 A JPH0346512 A JP H0346512A JP 18222589 A JP18222589 A JP 18222589A JP 18222589 A JP18222589 A JP 18222589A JP H0346512 A JPH0346512 A JP H0346512A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- outer cylinder
- length
- metal outer
- inductance coil
- 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.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 title claims description 22
- 239000002184 metal Substances 0.000 claims description 40
- 229910052751 metal Inorganic materials 0.000 claims description 40
- 238000001514 detection method Methods 0.000 claims description 16
- 238000000465 moulding Methods 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 239000003822 epoxy resin Substances 0.000 abstract description 3
- 229920000647 polyepoxide Polymers 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000012212 insulator Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 229910001369 Brass Inorganic materials 0.000 description 3
- 230000032683 aging Effects 0.000 description 3
- 239000010951 brass Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、機械装置や検査装置における変位量を検出
、測定する場合等に用いて好適な変位量測定装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a displacement measuring device suitable for use in detecting and measuring displacement in mechanical devices and inspection devices.
この発明は、コアを内蔵して一定の長さに巻回した一対
の第１及び第２コイルを近接して設け、第１コイルには
第１金属外筒を移動可能に被せて可変インダクタンス・
コイル、第２コイルには第２金属外筒を調整可能に被せ
て固定インダクタンス・コイルと夫々なし、これ等のコ
イルと高周波発振器及び整流器を含む検波回路とを組合
せることにより、所望の出力電圧、直線性、安定度を保
持し乍ら装置の小型化及び正確で揃った製品ができるよ
うにしたものである。In this invention, a pair of first and second coils each having a built-in core and wound to a certain length are provided in close proximity to each other, and a first metal outer cylinder is movably placed over the first coil to create a variable inductance.
The coil and the second coil are each fitted with a fixed inductance coil by adjusting a second metal outer cylinder, and by combining these coils with a detection circuit including a high frequency oscillator and a rectifier, the desired output voltage can be set. While maintaining linearity and stability, it is possible to miniaturize the device and produce accurate and uniform products.
機械装置において、変位量を電気的に測定するため各種
のスケールが用いられているが、スケ−ルは形状が大き
く高価なため用途が制限される欠点がある。比較的変位
量が少ない場合、差動トランスが最も多く用いられてい
るが、差動トランスには次の如き３つの欠点がある。Various types of scales are used in mechanical devices to electrically measure the amount of displacement, but scales have the drawback of being large in size and expensive, which limits their use. When the amount of displacement is relatively small, differential transformers are most often used, but differential transformers have the following three drawbacks.
第１に、コイルの中をコアが出入する構造であるため、
差動トランスのコイルに比べて装置全体が長くなり、変
位量が長い場合不適当である。First, because the core moves in and out of the coil,
The entire device is longer than the coil of a differential transformer, and is unsuitable if the amount of displacement is long.
第２に、差動トランスは、２個のコイルを軸方向に並べ
た構造で、変位測定範囲に比べ２個並んだコイルの長さ
が普通３倍近くも長くなる。Second, a differential transformer has a structure in which two coils are arranged in the axial direction, and the length of the two coils is usually nearly three times longer than the displacement measurement range.
第３に、コアが出入する構造ではコアが片持ち支持にな
るため、振動に弱い。Third, in a structure in which the core moves in and out, the core is supported on a cantilever, making it vulnerable to vibration.
そこで、コイルの中に入るコアは固定しておき、コイル
の外側に被せた金属外筒を移動する構造として、上記第
１ないし第３の問題点を解決した変位測定装置を本出願
人は先に提案した（特願昭６２−１０７３５７号）。Therefore, the present applicant has previously developed a displacement measuring device that solves the first to third problems by having a structure in which the core that goes into the coil is fixed and the metal outer cylinder that is placed on the outside of the coil is moved. (Japanese Patent Application No. 107357/1982).
ところが、この特願昭６２−１０７３５７号に記載され
た変位測定装置の場合、コイルＡ及びＢを隣接して軸方
向に並べて使用するので、コイル全体の長さが大きくな
り、結局装置全体が大きくなる欠点がある。However, in the case of the displacement measuring device described in Japanese Patent Application No. 62-107357, the coils A and B are used adjacent to each other in the axial direction, so the length of the entire coil becomes large, and as a result, the entire device becomes large. There is a drawback.
このことは特に本装置を応用する例えば油圧シリンダや
空気圧シリンダ等では問題となる。This is particularly a problem in hydraulic cylinders, pneumatic cylinders, etc. to which this device is applied.
そこで、所望の出力電圧、直線性、安定度を保持し乍ら
実質的にコイル長を短くして装置の形状を小さくするこ
とができる変位測定装置を本出願人は先に提案した（特
願昭６３−２７１４３４号）。Therefore, the applicant has previously proposed a displacement measuring device that can reduce the size of the device by substantially shortening the coil length while maintaining the desired output voltage, linearity, and stability (patent application (Sho 63-271434).
この変位測定装置は、コアを内蔵して一定の長さに巻回
した第１コイルを有し、この第１コイルにこれと略々同
長の第１金属外筒を移動可能に被せた可変インダクタン
ス・コイルと、コアを内蔵して一定の長さに巻回した第
２コイルを有し、この第２コイルにこれと略々同長か又
はこれより短い第２金属外筒を固定的に被せた固定イン
ダクタンス・コイルと、高周波発振器及び整流器を含み
可変インダクタンス・コイル及び固定インダクタンス・
コイルに接続された検波回路とを備え、固定インダクタ
ンス・コイルを可変インダクタンス・コイルと離間して
設け、第１金属外筒が移動したときその変位量に応じた
直流電圧を検波回路の出力側に得るように構成したもの
である。This displacement measuring device has a first coil that has a built-in core and is wound to a constant length, and a variable displacement measuring device that is movably covered with a first metal outer cylinder having approximately the same length as the first coil. It has an inductance coil and a second coil that has a built-in core and is wound to a certain length, and a second metal outer cylinder that is approximately the same length or shorter than the second coil is fixedly attached to the second coil. A fixed inductance coil, a variable inductance coil and a fixed inductance coil including a high frequency oscillator and a rectifier.
and a detection circuit connected to the coil, the fixed inductance coil is provided separately from the variable inductance coil, and when the first metal outer cylinder moves, a DC voltage corresponding to the amount of displacement is applied to the output side of the detection circuit. It is configured so that it can be obtained.
ところが特願昭６３−４７１４３４号に記載されている
ような変位測定装置の場合、デテクタの中にダミーコイ
ルとしての第２コイルを組込んだ場合、第１コイルに合
わせて第２コイルのインダクタンスを調整した上でデテ
クタ全体を例えばエポキシ樹脂でモールドするようにし
ているので、モールド後は第２コイルは調整できない欠
点がある。つまり、第２コイルの第２の金属外筒までも
モールドされて固定されてしまうからである。また、モ
ールドし、加熱エージング等の処置をした後でセンサの
特性を少し調整しようと思ってもそれができない欠点が
ある。However, in the case of a displacement measuring device such as that described in Japanese Patent Application No. 63-471434, when a second coil as a dummy coil is incorporated into the detector, the inductance of the second coil is adjusted to match that of the first coil. Since the entire detector is molded with, for example, epoxy resin after the adjustment, there is a drawback that the second coil cannot be adjusted after molding. In other words, the second metal outer cylinder of the second coil is also molded and fixed. Another disadvantage is that even if one wishes to slightly adjust the characteristics of the sensor after it has been molded and subjected to treatments such as heat aging, it is not possible to do so.
この発明は断る点に鑑みてなされたもので、コイル及び
デテクタを樹脂でモールドしエージングを行った後最終
段階でダ稟−コイルの調整を行うことができる変位測定
装置を提供するものである。This invention has been made in view of the above points, and it is an object of the present invention to provide a displacement measuring device in which the coil and the detector can be molded with resin and then adjusted at the final stage after aging.
この発明による変位測定装置は、コアを内蔵して一定の
長さに巻回した第１コイルを有し、この第１コイルにこ
れと略々同長の第１金属外筒（４）を移動可能に被せた
可変インダクタンス・コイル（Ａ）と、コアを内蔵して
一定の長さに巻回した第２コイルを有し、この第２コイ
ルにこれと略々同長か又はこれより短い第２金属外筒（
５）を調整可能に被せた固定インダクタンス・コイル（
Ｂ）と、高周波発振器（Ｏ５Ｃ）及び整流器（Ｄ＋＋ｒ
＋＋Ｃ＋）＋ （Ｄｚ＋ｒｚ＋ｃｚ）を含み可変インダ
クタンス・コイル（Ａ）及び固定インダクタンス・コイ
ル（Ｂ）に接続された検波回路（１０）とを備え、固定
インダクタンス・コイル（Ｂ）を可変インダクタンス・
コイル（Ａ）と近接して設け、上記第１金属外筒（４）
が移動したときその変位量に応じた直流電圧を検波回路
（１０）の出力側に得るように構成している。The displacement measuring device according to the present invention has a first coil having a built-in core and wound to a constant length, and a first metal outer cylinder (4) having approximately the same length as the first coil is moved to the first coil. It has a variable inductance coil (A) that can be covered with a variable inductance coil (A), and a second coil that has a built-in core and is wound to a certain length. 2 Metal outer cylinder (
5) Fixed inductance coil (
B), high frequency oscillator (O5C) and rectifier (D++r
++C+)+ (Dz+rz+cz) and a detection circuit (10) connected to the variable inductance coil (A) and the fixed inductance coil (B), and the fixed inductance coil (B) is connected to the variable inductance coil (B).
The first metal outer cylinder (4) is provided adjacent to the coil (A).
When the detector circuit (10) moves, a DC voltage corresponding to the amount of displacement is obtained on the output side of the detection circuit (10).
可変インダクタンス・コイル（Ａ）に対しては第１金属
外筒（４）を移動可能に設け、固定インダクタンス・コ
イル（Ｂ）に対しては第２金属外筒（５）を調整可能に
設けると共に両コイルを近接して配置する。つまり、可
変インダクタンス・コイル（Ａ）と第１金属外筒（４）
を被測定側すなわち測定しようとする移動体側に設ける
と共に固定インダクタンス・コイル（Ｂ）と第２金属外
筒（５）も可変インダクタンス・コイル（Ａ）と近接し
て設ける。A first metal outer cylinder (4) is movably provided for the variable inductance coil (A), and a second metal outer cylinder (5) is adjustable for the fixed inductance coil (B). Place both coils close together. In other words, the variable inductance coil (A) and the first metal outer cylinder (4)
is provided on the side to be measured, that is, on the side of the moving body to be measured, and a fixed inductance coil (B) and a second metal outer cylinder (5) are also provided close to the variable inductance coil (A).
そして、回路的にはこれ等両コイルを検波回路（１０）
に接続する。そして、第１金属外筒（４）の移動によっ
て可変インダクタンス・コイル（Ａ）のインダクタンス
が変化する。第１金属外筒（４）は可変インダクタンス
・コイル（Ａ）に対して外側に設けた短絡２次コイルの
作用をして、第１金属外筒（４）が被さった部分の可変
インダクタンス・コイルＡのインダクタンスが著しく減
少する。このインダクタンスの変位を電圧に変えること
により、変位量を検出できる。この場合、固定インダク
タンス・コイル（Ｂ）に被っている第２金属外筒（５）
はコイルやデデクタのモールド化とは無関係に自由に移
動できるので正確で揃った製品を作ることができる。In terms of circuit, both of these coils are connected to a detection circuit (10).
Connect to. The inductance of the variable inductance coil (A) changes as the first metal outer cylinder (4) moves. The first metal outer cylinder (4) acts as a short-circuit secondary coil provided outside the variable inductance coil (A), and the variable inductance coil in the part covered by the first metal outer cylinder (4) The inductance of A is significantly reduced. By converting this inductance displacement into voltage, the amount of displacement can be detected. In this case, the second metal outer cylinder (5) covering the fixed inductance coil (B)
can be moved freely regardless of the molding of the coil or deductor, making it possible to produce accurate and consistent products.
〔実施例］
以下、この発明の一実施例を第１図〜第６図に基づいて
詳しく説明する。[Example] Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 6.
第１図はこの発明の第１実施例を示すもので、コイル部
分とデテクタ側が分離したいわゆる分離型で、ここでは
コイル部分のみを示している。同図において、（１）は
コイル外筒、（２）は支持金具、Ａは可変インダクタン
ス・コイルとしての主コイル、Ｂは固定インダクタンス
・コイルとしてのダミーコイルである。コイル外筒（１
）は支持金具（２）の穴に差し込まれ、この中でケーブ
ル（３）とコイルＡ、 Ｂのリード線が接続される。FIG. 1 shows a first embodiment of the present invention, which is a so-called separated type in which the coil portion and the detector side are separated, and only the coil portion is shown here. In the figure, (1) is a coil outer cylinder, (2) is a support metal fitting, A is a main coil as a variable inductance coil, and B is a dummy coil as a fixed inductance coil. Coil outer cylinder (1
) is inserted into the hole in the support fitting (2), and the cable (3) and the lead wires of coils A and B are connected inside it.
コイル外筒（１）の中には例えば長さ５ｍｍ程度の短い
ダミーコイルＢが元の方に巻回され、続けて長い主コイ
ルＡが巻回されている。主コイルＡの長さは通常２０ｍ
ｍ以上数百ｍｍに及ぶ。Inside the coil outer cylinder (1), a short dummy coil B having a length of, for example, about 5 mm is wound toward the original end, and then a long main coil A is wound therein. The length of main coil A is usually 20m.
m or more, extending to several hundred mm.
主コイルＡに対してコイル外筒（１）の外側に主コイル
Ａと略同長の第１の金属外筒（４）が移動可能に続けら
れる。また、ダミーコイルＢに対してコイル外筒（１）
の外側に長さが例えば４ ｍｍ程度の第２金属外筒（５
）が設けられ、この第２金属外筒（５）は手でもって移
動できる。第２金属外筒（５）の外側に支持金具（２）
と隣接して例えばプラスチックから戒る絶縁物のカバー
（６）がいわゆるキャップとして設けられる。A first metal outer cylinder (4) having approximately the same length as the main coil A is movably continued outside the coil outer cylinder (1) with respect to the main coil A. Also, for the dummy coil B, the coil outer cylinder (1)
A second metal outer cylinder (5 mm) with a length of about 4 mm is placed on the outside of the
), and this second metal outer cylinder (5) can be moved by hand. There is a support fitting (2) on the outside of the second metal outer cylinder (5).
Adjacent thereto, a cover (6) of insulating material, for example made of plastic, is provided as a so-called cap.
最終的に支持金具（２）、主コイルＡ、ダミーコイルＢ
等は例えばエポキシ樹脂でモールドされるが、第１及び
第２金属外筒（４）、 （５）はモールドされない。Finally, support metal fittings (2), main coil A, dummy coil B
etc. are molded with epoxy resin, for example, but the first and second metal outer cylinders (4) and (5) are not molded.
そして、この場合ダミーコイルＢの部分約１０ｍｍだけ
実質的にコイルが長くなるがセンサが完成した後に第２
金属外筒（５）をスライドして出力特性を調整できる。In this case, the length of the dummy coil B is substantially increased by about 10 mm, but after the sensor is completed, the second
Output characteristics can be adjusted by sliding the metal outer cylinder (5).
調整した後に接着材でダミーコイルＢを固定し、カバー
（６）を被せて仕上がりとなる。After adjustment, fix the dummy coil B with adhesive and cover with the cover (6) to complete the process.
第２図はこの発明の第２実施例を示すもので、デデクタ
とコイルが一体形の場合である。同図において、第１図
と対応する部分には同一符号を付し、その詳細説明は省
略する。FIG. 2 shows a second embodiment of the present invention, in which the deductor and the coil are integrated. In this figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed explanation thereof will be omitted.
従来はダミーコイルＢをデデクタ（７）の中に収めたが
モールド後調整ができないので、本実施例では第２図に
示すようにダミーコイルＢをデデクタ（７）の外側に出
している。この場合もダミーコイルＢの部分約１０ｍｍ
コイルが長くなるがセンサが完成した後に、第２金属外
筒（５）をスライドして出力特性を調整できる。調整し
た後に接着材でダミーコイルＢを固定し、カバー（６）
を被せて仕上がりとなる。Conventionally, the dummy coil B was housed inside the dedictor (7), but since it could not be adjusted after molding, in this embodiment the dummy coil B was placed outside the dedictor (7) as shown in FIG. In this case as well, the portion of dummy coil B is approximately 10mm.
Although the coil becomes longer, the output characteristics can be adjusted by sliding the second metal outer cylinder (5) after the sensor is completed. After adjusting, fix dummy coil B with adhesive and attach the cover (6).
Cover with to finish.
第４図は、この発明に用いる検波回路（１０）の例を示
すもので、この検波回路（１０）は、高周波発振器ＯＳ
ＣによりコイルＡ、 Ｂに高周波電圧を逆方向に加え、
インダクタンスの変化によって変化する抵抗器Ｒ８両端
の交流電圧を平滑回路を含む整流器（Ｄ＋＋ｒ＋＋Ｃ＋
）＋ （Ｄｚ、ｒ＋＋ｃｚ）により直流電圧に変え、そ
の差電圧をコンデンサＣ３の両端に出力として取出すよ
うにしている。検波回路（１０）はこのような差動形で
なくてもよいが、差動形の方が直線性や温度特性がよい
。FIG. 4 shows an example of a detection circuit (10) used in the present invention, and this detection circuit (10) is a high-frequency oscillator OS
Apply high frequency voltage to coils A and B in opposite directions by C,
A rectifier (D++r++C+
) + (Dz, r++cz) to convert it into a DC voltage, and the difference voltage is taken out as an output across the capacitor C3. Although the detection circuit (10) does not have to be of such a differential type, a differential type has better linearity and temperature characteristics.
本実施例ではコイルＢをダミーとして成る一定値に固定
し、主コイルＡのインダクタンスの変化を利用するため
に、ダミーコイルＢの特性位置により出力電圧が上下に
大きくずれる。従って、出力電圧を一定の規格値に合せ
る為にはダミーコイルＢの調整が微妙に効いて来る。In this embodiment, the coil B is fixed to a constant value as a dummy, and the change in inductance of the main coil A is utilized, so the output voltage varies vertically depending on the characteristic position of the dummy coil B. Therefore, in order to adjust the output voltage to a certain standard value, the adjustment of the dummy coil B becomes slightly effective.
第４図はコイルＡ、Ｂ及び第２金属外筒（５）を固定し
、第１金属外筒（４）を変位させたときの検出回路（１
０）の共通端子（ＩＩＣ）と出力端子（１１八）、 （
ＩＩＢ）に得られる出力電圧ＶＡ、Ｖ、を示したもので
、第２金属外筒（５）を移動させてコイルＢのインダク
タンスがＰ、の所にあるときの共通端子（１１Ｃ）と出
力端子（ＩＩＢ）の間の出力電圧Ｖｌｌは略９Ｖ付近に
あるも第２金属外筒（５）を移動させてコイルＢのイン
ダクタンスがＰ２にあるときの共通端子（ＩＩＣ）と出
力端子（ＩＩＢ）の間の出力電圧Ｖ＋＋（Ｐ２）は略々
１１ｖ付近にあることかわかる。つまり、第２金属外筒
（５）の設定の仕方によって出力電圧■８が変わること
がわかる。Figure 4 shows the detection circuit (1) when the coils A, B and the second metal outer cylinder (5) are fixed and the first metal outer cylinder (4) is displaced.
0) common terminal (IIC) and output terminal (118), (
IIB) shows the output voltages VA and V obtained at the common terminal (11C) and the output terminal when the second metal outer cylinder (5) is moved and the inductance of the coil B is at P. Although the output voltage Vll between (IIB) is approximately 9V, when the second metal outer cylinder (5) is moved, the voltage between the common terminal (IIC) and the output terminal (IIB) when the inductance of coil B is at P2 is It can be seen that the output voltage V++ (P2) between them is approximately 11V. In other words, it can be seen that the output voltage (8) changes depending on how the second metal outer cylinder (5) is set.
そして、検出回路（１０）の出力電圧は電圧ＶＡと■８
の差つまり出力端子（１１＾〉及び（ＩＩＢ）間の電圧
であるので、コイルＢのインダクタンスがＰ。The output voltage of the detection circuit (10) is the voltage VA and ■8
In other words, it is the voltage between the output terminals (11^> and (IIB)), so the inductance of coil B is P.
にあるときの出力電圧ＶＡ−Ｖｌｌ （ＰＩ）は第５図
の如く＋６■から０■の間を変化する直線となり、コイ
ルＢのインダクタンスがＰ２にあるときの出力電圧ＶＡ
Ｖｓ（Ｐｇ）は第５図の如く±３■の間を変化する
直線となる。The output voltage VA-Vll (PI) when the inductance of the coil B is at P2 is a straight line that changes between +6 and 0 as shown in Figure 5.
Vs(Pg) is a straight line that varies within ±3 cm as shown in FIG.
ここでダご−コイルＢをインダクタンスがＰ２のところ
に合せると、上述の如く出力電圧ｖＡＶｉ （Ｐｇ）
は±３ｖの出力となるが直線性の補正が悪いと出力電圧
０の点が中心からずれる。このようにダミーコイルＢは
主コイルＡに合わせて設定するもので設定が僅かずれて
も直線の原点（出力電圧０）のずれが目立つようになる
。従って、第２金属外筒（５）を微調してダミーコイル
Ｂの調整が必要になるわけである。Here, when the inductance of the double coil B is set to P2, the output voltage vAVi (Pg)
will produce an output of ±3 V, but if the linearity correction is poor, the point of output voltage 0 will shift from the center. In this way, the dummy coil B is set to match the main coil A, and even if the setting deviates slightly, the deviation of the origin of the straight line (output voltage 0) becomes noticeable. Therefore, it is necessary to adjust the dummy coil B by finely adjusting the second metal outer cylinder (5).
なお、第１図における支持金具（２）を黄銅棒で作りそ
の外径φ６長さ２０ｍｍとし、ガラエポから成るコイル
外筒（１）を外径φ４．内径φ２．８長さ１００ｍｍと
し、ダミーコイルＢをコアの長さ５１１ＩＩ１１１コイ
ル０．０６φ、銅線１４０回巻長４ｍｍとし、第２金属
外筒を黄銅で作りその内径φ４．１、外径φ４．６、長
さ４１ｎＩ１１とし、カバー（６）を黒色ベークライト
で作り内径φ４．８、外径φ５．６、長さ１０ｍｍとし
たとき、第２金属外筒（５）を移動して第４図の１１点
、１２点の何れも調整可能であった。The support fitting (2) in FIG. 1 is made of a brass rod with an outer diameter of φ6 and a length of 20 mm, and the coil outer cylinder (1) made of glass epoxy is made of a brass rod with an outer diameter of φ4. The inner diameter is 2.8 mm, the length is 100 mm, the dummy coil B has a core length of 511 II, 111 coils of 0.06 mm, and a copper wire winding length of 4 mm with 140 turns.The second metal outer cylinder is made of brass and has an inner diameter of 4.1 mm and an outer diameter of 4 mm. .6, the length is 41nI11, and the cover (6) is made of black Bakelite and has an inner diameter of φ4.8, an outer diameter of φ5.6, and a length of 10mm, and the second metal outer cylinder (5) is moved to form the cylinder shown in Fig. 4. Both 11 and 12 points were adjustable.
第６図は本実施例で使用したコイルＡ、Ｂの部分を具体
的にした一例を示すもので、コア（７）は外径φ１．８
内径φ０．７長さ５開のフェライトコアピースを使いφ
０．７の燐青胴のワイヤ（８）に通して第６図Ａに示す
ように配置固定し、コイルＡ、Ｂを巻線した。沢山作る
ときは第９図Ｂに示すようにダミーコイルＢと主コイル
Ａのコア（７）を切離した形で別々に巻線し、間を半田
付けで止めるようにした。なおコイルＡの片線第９図Ｂ
の如くワイヤ（８）に半田付けしてリード線の扱いを楽
にした。Fig. 6 shows a concrete example of the coils A and B used in this example, and the core (7) has an outer diameter of φ1.8.
Use a ferrite core piece with an inner diameter of φ0.7 and a length of 5 holes.
The coils A and B were wound by passing through a wire (8) of 0.7 phosphorescent body and fixing the wire as shown in FIG. 6A. When making a large number of coils, the cores (7) of the dummy coil B and the main coil A were separated and wound separately, as shown in FIG. 9B, and the gaps were soldered together. In addition, one line of coil A is shown in Fig. 9B.
The lead wires can be easily handled by soldering them to the wires (8) as shown in the figure.
上述の如くこの発明によれば、コイル及びデテクタを樹
脂でモールドし、エージングを行った後最終段階で第２
金属外筒（５）を移動してダミーコイルＢの調整ができ
るために正確で揃った製品ができるようになった。また
主コイルＡとダミーコイルＢが実質的に近接して一体と
なっているためにデテクタ及びコイル何れにも互換性を
保つことができるようになり、このことは使い易さ作り
易さ等の面で大きな利益かある。更にダミーコイルＢを
主コイルＡに近接するようにしたので温度変化に対し両
コイル相互の影響が相殺するようになり、温度特性が改
善された。As described above, according to the present invention, the coil and the detector are molded with resin, and after aging, the second molding is performed in the final stage.
Since the dummy coil B can be adjusted by moving the metal outer cylinder (5), accurate and uniform products can now be produced. In addition, since the main coil A and dummy coil B are substantially close to each other and integrated, it is possible to maintain compatibility with both the detector and the coil, which makes it easier to use and manufacture. There are big benefits in terms of this. Furthermore, since the dummy coil B is placed close to the main coil A, the effects of both coils cancel each other out against temperature changes, and the temperature characteristics are improved.
第１図はこの発明の一実施例を示す権威図、第２図はこ
の発明の他の実施例を示す権威図、第３図はこの発明で
使用される検波回路の一例を示す回路構成図、第４図及
び第５図はこの発明による変位検出特性を示す図、第６
図はこの発明の要部を示す権威図である。
（４）は第１金属外筒、（５）は第２金属外筒、（７）
はデクタ、（１０）は検波回路、Ａは主コイル、Ｂはダ
ミーコイル、ＯＳＣは高周波発振器、（Ｄ＋＋ｒ＋＋Ｃ
＋）＋ （Ｄｚ＋ｒｚ＋ｃｚ）は整流器である。
嘔Ｒ争県β゛げ
牢舌１５／）構成国
第６図FIG. 1 is an authority diagram showing one embodiment of this invention, FIG. 2 is an authority diagram showing another embodiment of this invention, and FIG. 3 is a circuit configuration diagram showing an example of a detection circuit used in this invention. , FIG. 4 and FIG. 5 are diagrams showing displacement detection characteristics according to the present invention, and FIG.
The figure is an authoritative diagram showing the main parts of this invention. (4) is the first metal outer cylinder, (5) is the second metal outer cylinder, (7)
is a detector, (10) is a detection circuit, A is a main coil, B is a dummy coil, OSC is a high frequency oscillator, (D++r++C
+)+ (Dz+rz+cz) is a rectifier. Figure 6 of the constituent countries
Claims (1)
し、該コイルにこれに略同長の第１金属外筒を移動可能
に被せた可変インダクタンス・コイルと、 コアを内蔵して一定の長さに巻回した第２コイルを有し
、該コイルにこれと略同長か又はこれより短い第２金属
外筒を調整可能に被せた固定インダクタンス・コイルと
、 高周波発振器及び整流器を含み上記可変インダクタンス
・コイル及び固定インダクタンス・コイルに接続された
検波回路と を備え、上記固定インダクタンス・コイルを上記可変イ
ンダクタンス・コイルと近接して設け、上記第１金属外
筒が移動したときその変位量に応じた直流電圧を上記検
波回路の出力側に得るようにしたことを特徴とする変位
測定装置。[Scope of Claims] A variable inductance coil having a first coil having a built-in core and wound to a constant length, and a first metal outer cylinder of approximately the same length movably covering the coil. and a fixed inductance coil having a second coil with a built-in core and wound to a certain length, and a second metal outer cylinder of approximately the same length or shorter than this coil is adjustable and covered with the second coil. and a detection circuit including a high-frequency oscillator and a rectifier and connected to the variable inductance coil and the fixed inductance coil, the fixed inductance coil being provided in close proximity to the variable inductance coil, A displacement measuring device characterized in that when the cylinder moves, a DC voltage corresponding to the amount of displacement is obtained on the output side of the detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18222589A JPH0623659B2 (en) | 1989-07-14 | 1989-07-14 | Displacement measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18222589A JPH0623659B2 (en) | 1989-07-14 | 1989-07-14 | Displacement measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0346512A true JPH0346512A (en) | 1991-02-27 |
| JPH0623659B2 JPH0623659B2 (en) | 1994-03-30 |
Family
ID=16114530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18222589A Expired - Lifetime JPH0623659B2 (en) | 1989-07-14 | 1989-07-14 | Displacement measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623659B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002107238A (en) * | 2000-09-29 | 2002-04-10 | Tadatoshi Goto | Load sensor |
| JP2009204346A (en) * | 2008-02-26 | 2009-09-10 | Panasonic Electric Works Co Ltd | Position sensor |
| JP2011075497A (en) * | 2009-10-01 | 2011-04-14 | Mitsubishi Electric Corp | Position detecting method of movable element of electromagnetic actuator, and detection device therefor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4747224B1 (en) * | 2010-07-15 | 2011-08-17 | 株式会社マコメ研究所 | Inductance change detection circuit, displacement detection device, and metal detection device |
| JP4898971B1 (en) * | 2011-04-01 | 2012-03-21 | 株式会社マコメ研究所 | Inductance change detection circuit, displacement detection device, and metal detection device |
-
1989
- 1989-07-14 JP JP18222589A patent/JPH0623659B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002107238A (en) * | 2000-09-29 | 2002-04-10 | Tadatoshi Goto | Load sensor |
| JP2009204346A (en) * | 2008-02-26 | 2009-09-10 | Panasonic Electric Works Co Ltd | Position sensor |
| JP2011075497A (en) * | 2009-10-01 | 2011-04-14 | Mitsubishi Electric Corp | Position detecting method of movable element of electromagnetic actuator, and detection device therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0623659B2 (en) | 1994-03-30 |
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