JPH07159107A - Magnetic type stroke detecting sensor - Google Patents
Magnetic type stroke detecting sensorInfo
- Publication number
- JPH07159107A JPH07159107A JP34014193A JP34014193A JPH07159107A JP H07159107 A JPH07159107 A JP H07159107A JP 34014193 A JP34014193 A JP 34014193A JP 34014193 A JP34014193 A JP 34014193A JP H07159107 A JPH07159107 A JP H07159107A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- detection
- scale
- magnetic resistance
- detecting
- 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
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、磁気スケールの軸方向
移動量を検出する磁気式ストローク検出センサに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic stroke detection sensor for detecting the amount of axial movement of a magnetic scale.
【０００２】[0002]
【従来の技術】従来、この種のストローク検出センサの
内、特に自動車ＥＧＲ装置等に用いられるものは、高温
下の過酷な条件で使用されるため、このような使用に適
した構造の磁気式ストローク検出センサが使用されてい
る。このような、磁気式ストローク検出センサの具体例
を図６により説明する。図６（ａ）において、磁気式ス
トローク検出センサは、検出体２２、磁気スケール（被
検出体）２１、及び演算回路２８等で構成され、検出体
２２の励磁コイル３０で励磁された磁束２５を磁気検出
部２３（３１）に供給し、この磁気検出部２３に磁気ス
ケール２１に形成された所定ピッチＰの磁気ストライプ
２４を通過させ、これによる磁気検出部２３の磁気抵抗
の変化を検出コイル２６（２７）で検出し、この検出信
号を演算回路２８で処理している。すなわち、演算回路
２８で磁気ストライプ２４の通過による検出信号の変化
をパルス化して、このパルス数をカウントし、このカウ
ント数と磁気ストライプのピッチＰとの積で磁気スケー
ル２１の変位量を算出している。そして、図６（ｂ）に
示すように検出体２２には前述の磁気検出部２３、３１
及び検出コイル２６、２７をそれぞれ２箇所設けて磁気
スケール２１の変位方向の検出を可能としている。2. Description of the Related Art Conventionally, among stroke detection sensors of this kind, those used in automobile EGR devices and the like are used under severe conditions at high temperatures, and therefore magnetic sensors having a structure suitable for such use are used. A stroke detection sensor is used. A specific example of such a magnetic stroke detection sensor will be described with reference to FIG. In FIG. 6A, the magnetic stroke detection sensor includes a detection body 22, a magnetic scale (subject to be detected) 21, an arithmetic circuit 28, and the like, and generates a magnetic flux 25 excited by an exciting coil 30 of the detection body 22. It is supplied to the magnetic detection unit 23 (31), and the magnetic detection unit 23 is caused to pass through the magnetic stripes 24 having a predetermined pitch P formed on the magnetic scale 21, and a change in the magnetic resistance of the magnetic detection unit 23 due to this is detected by the detection coil 26. The detection signal is detected in (27), and this detection signal is processed by the arithmetic circuit 28. That is, the change in the detection signal due to the passage of the magnetic stripe 24 is pulsed by the arithmetic circuit 28, the number of pulses is counted, and the displacement amount of the magnetic scale 21 is calculated by the product of this count number and the pitch P of the magnetic stripe. ing. Then, as shown in FIG. 6B, the above-mentioned magnetic detection units 23 and 31 are provided on the detection body 22.
Also, two detection coils 26 and 27 are provided to detect the displacement direction of the magnetic scale 21.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上述の磁気
ストローク検出センサでは、磁気ストライプのピッチＰ
が磁気スケールの変位の最小単位、すなわちセンサの分
解能力となる。そして、この磁気ストライプ２４は磁性
体である磁気スケール２１に加工された溝により形成さ
れるが、この溝加工幅は検出体２２の検出能力及び溝形
成技術から限界があり、従ってセンサの分解能力もこれ
が限界となる。また、上述の磁気スケール２１の変位量
の算出は、初期位置を定義し、溝及び山のカウントの加
算又は減算を繰り返すこととなり、また方向検知機能が
必要であるため演算回路２８の構成が複雑となる。By the way, in the above magnetic stroke detection sensor, the pitch P of the magnetic stripes is used.
Is the minimum unit of displacement of the magnetic scale, that is, the resolution capability of the sensor. The magnetic stripe 24 is formed by a groove processed in the magnetic scale 21, which is a magnetic body. The groove processing width is limited due to the detection ability of the detection body 22 and the groove forming technique, and therefore the disassembly ability of the sensor. This is the limit. Further, in the calculation of the displacement amount of the magnetic scale 21 described above, the initial position is defined, and the addition or subtraction of the counts of the groove and the crest is repeated, and since the direction detection function is required, the configuration of the arithmetic circuit 28 is complicated. Becomes
【０００４】本発明は、従来の技術の有するこのような
問題点に鑑みてなされたものであり、その目的とすると
ころは、高温下での使用に適し、かつ分解能の限界を小
さくできるとともに、演算回路の構成を簡略化可能な磁
気式ストローク検出センサを提供することにある。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to be suitable for use at high temperature and to reduce the resolution limit. It is an object of the present invention to provide a magnetic stroke detection sensor that can simplify the configuration of an arithmetic circuit.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明における磁気式ストローク検出センサは、長
手方向に幅が直線的に変化する又はある関数で定義され
る曲線的に変化する第１の磁気抵抗相違部と長手方向に
幅が変化しない又は前記第１の磁気抵抗相違部と異なっ
て長手方向に幅が直線的に変化する第２の磁気抵抗相違
部とを並設してなる被検出体と、この被検出体の第１及
び第２の磁気抵抗相違部が同時にそれぞれ通過する微小
幅で延在する２つの磁気検出部を有し、この２つの磁気
検出部に共通に励磁された磁束を供給して各磁気検出部
の磁気抵抗の変化に応じた信号をそれぞれ出力する検出
体と、この検出体から出力される前記２つの信号の差を
出力する差動回路とを備えてなるものである。In order to solve the above-mentioned problems, a magnetic stroke detection sensor according to the present invention has a width that changes linearly in the longitudinal direction or a curve that is defined by a certain function. And a second magnetic resistance difference portion whose width does not change in the longitudinal direction or whose width changes linearly in the longitudinal direction unlike the first magnetic resistance difference portion. The object to be detected and the two magnetic detecting portions extending with a minute width through which the first and second magnetic resistance different portions of the object to be detected simultaneously pass, and the two magnetic detecting portions are commonly excited. And a differential circuit that outputs a signal corresponding to a change in the magnetic resistance of each magnetic detection unit and that outputs a difference between the two signals output from the detection unit. It will be.
【０００６】[0006]
【作用】微小幅で延在する磁気検出部を長手方向に幅が
直線的に又はある関数で定義される曲線的に変化する第
１の磁気抵抗相違部が通過することにより、変位量に直
線的に比例又は反比例する検出信号がアナログ信号とし
て得られる。さらに、これに並設された第２の磁気抵抗
相違部とその磁気検出部からも同様の検出信号が得ら
れ、かつ両磁気検出部には共通に励磁された磁束が供給
されているので、両検出信号の差を取ることにより温度
補償がなされる。The first magnetic reluctance different portion whose width changes linearly in the longitudinal direction or curve-wise defined by a certain function passes through the magnetic detection portion extending with a very small width, so that the displacement amount becomes linear. A detection signal that is proportional or inversely proportional is obtained as an analog signal. Furthermore, since the same detection signal is obtained from the second magnetic resistance different portion and the magnetic detection portion arranged in parallel with each other, and the magnetic flux commonly excited is supplied to both magnetic detection portions, Temperature compensation is performed by taking the difference between both detection signals.
【０００７】[0007]
【実施例】以下、本発明の実施例について図面を参照し
つつ説明する。図１は本発明の磁気式ストローク検出セ
ンサの構成を示す概要図、図２は検出体の外観図、図３
は信号処理回路の構成を示す回路図、図４は信号処理回
路の動作を示す電圧グラフ図、図５は温度補償を示す電
圧─温度グラフ図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing the configuration of a magnetic stroke detection sensor of the present invention, FIG. 2 is an external view of a detection body, and FIG.
Is a circuit diagram showing the configuration of the signal processing circuit, FIG. 4 is a voltage graph diagram showing the operation of the signal processing circuit, and FIG. 5 is a voltage-temperature graph diagram showing temperature compensation.
【０００８】まず、図１に基づき構成を説明する。図１
（ａ）において、磁気式ストローク検出センサは、検出
体４、磁気スケール（被検出体）１、及び信号処理回路
４０で構成される。検出体４は、磁気スケール１との対
向面に磁気検出部６、７を有し励磁及び検出コイルは信
号処理回路４０に接続されている。磁気スケール１はシ
ャフト５に磁性体からなる被検出部１ａが設けられてお
り、矢印方向に磁気検出部６、７を通過して移動するよ
うになっている。図１（ａ）のＡ矢視図である図１
（ｂ）において、前記被検出部１ａの検出体４との対向
面には、移動方向を１辺とする高さ（長さ）ｂ、幅ａ1
の直角３角形の第１磁気抵抗相違部２と、移動方向を長
辺とする高さ（長さ）ｂ、幅ａ2 ＝ａ1 ／２の長方形の
第２磁気抵抗相違部３とが、移動方向に対して位置を揃
えて並設されている。ここで、第２磁気抵抗相違部３の
幅ａ2 は説明の簡単のためにａ1 ／２としてものであ
り、適宜設定することができる。また、第１磁気抵抗相
違部２の３角形状も説明の簡単のため一辺を移動方向と
する直角３角形としたものであり、これに限定されず他
の３角形であってもよい。両磁気抵抗相違部２、３は図
１（ａ）に示すように、適値な高さを有する凸形状とな
っている。また、検出体４は両磁気抵抗相違部２、３に
対応する２つの磁気検出部６、７を有しており、これら
磁気検出部６、７は磁気スケール１の移動方向に対して
略直角に位置を揃え、かつ前記両磁気抵抗相違部２、３
がそれぞれ通過可能に配設されている。First, the structure will be described with reference to FIG. Figure 1
In (a), the magnetic stroke detection sensor includes a detection body 4, a magnetic scale (object to be detected) 1, and a signal processing circuit 40. The detection body 4 has magnetic detection units 6 and 7 on the surface facing the magnetic scale 1, and the excitation and detection coils are connected to the signal processing circuit 40. In the magnetic scale 1, a shaft 5 is provided with a detected portion 1a made of a magnetic material, and the magnetic scale 1 moves through the magnetic detection portions 6 and 7 in the arrow direction. FIG. 1 is a view on arrow A of FIG.
In (b), the height (length) b and the width a 1 of which one side is in the moving direction are provided on the surface of the detected portion 1a facing the detection body 4.
And a rectangular second magnetoresistive dissimilar portion 3 having a height (length) b and a width a 2 = a 1/2 whose long side is the moving direction. They are arranged in parallel with each other in the moving direction. Here, the width a 2 of the second magnetoresistance difference portion 3 is intended as a a 1/2 for simplicity of explanation, can be appropriately set. Further, the triangular shape of the first magnetoresistive different portion 2 is also a right-angled triangular shape with one side as the moving direction for the sake of simplicity of description, and the present invention is not limited to this and may be another triangular shape. As shown in FIG. 1A, the magnetic resistance difference portions 2 and 3 have a convex shape having an appropriate height. Further, the detection body 4 has two magnetic detection portions 6 and 7 corresponding to the magnetic resistance different portions 2 and 3, and these magnetic detection portions 6 and 7 are substantially perpendicular to the moving direction of the magnetic scale 1. Aligned with each other, and the magnetic reluctance different portions 2, 3
Are arranged so that they can pass through.
【０００９】図２において、検出体４は２つの検出体４
ａ、４ｂからなり、各検出体４ａ、４ｂは、磁気スケー
ルとの対向部にそれぞれ微小な幅ＷのギャップＧ１、Ｇ
２を有する環状の磁性体４１、４２に検出コイルＣ１、
Ｃ２、励磁コイルＣ３、Ｃ４、が巻回されており、かつ
これら両励磁コイルＣ３、Ｃ４は後述する共通の交流電
源により励磁されている。そして各励磁コイルＣ３、Ｃ
４により励磁された交番磁束が各磁性体４１、４２に供
給され、各ギャップＧ１、Ｇ２で図示するように磁気ス
ケールとの対向面４１ａ、４２ａに対して凸状の磁束分
布８を生じ、これが山脈状の磁気検出部６、７を形成す
るようになっている。そして、この磁気検出部６、７の
磁気抵抗が変化するとそれに応じて検出コイルＣ１、Ｃ
２に誘起される交流電圧の振幅が変化するので、これを
検出信号として出力するようになっている。In FIG. 2, the detector 4 is composed of two detectors 4.
Each of the detection bodies 4a and 4b includes a gap G1 and a gap G having a minute width W at a portion facing the magnetic scale.
The detection coil C1 is attached to the annular magnetic bodies 41 and 42 having
C2 and exciting coils C3 and C4 are wound, and both exciting coils C3 and C4 are excited by a common AC power supply described later. And each exciting coil C3, C
The alternating magnetic flux excited by 4 is supplied to the magnetic bodies 41 and 42, and as shown in the gaps G1 and G2, a convex magnetic flux distribution 8 is generated on the surfaces 41a and 42a facing the magnetic scale. The mountain-shaped magnetic detectors 6 and 7 are formed. When the magnetic resistance of the magnetic detectors 6 and 7 changes, the detection coils C1 and C are correspondingly changed.
Since the amplitude of the AC voltage induced in 2 changes, this is output as a detection signal.
【００１０】つぎに信号処理回路を図３に基づき説明す
る。図３において、各検出体の励磁コイルＣ３、Ｃ４は
共通の交流電源Ｅが印加される。各検出コイルＣ１、Ｃ
２に誘起される電圧ｖ1 、ｖ2 はそれぞれ差動増幅器の
−側端子及び＋側端子に入力され、その出力が検波器１
０で検波されて直流電圧ｖ3 として出力される。Next, the signal processing circuit will be described with reference to FIG. In FIG. 3, a common AC power source E is applied to the exciting coils C3 and C4 of each detector. Each detection coil C1, C
The voltages v 1 and v 2 induced in 2 are input to the − side terminal and the + side terminal of the differential amplifier, and the output thereof is the detector 1
It is detected at 0 and output as a DC voltage v 3 .
【００１１】つぎに、作動を図３及び図４に基づき説明
する。図４（ａ）、（ｂ）において、いま図１の矢印
方向に磁気スケールが移動するとすると、時刻ｔ0 で各
磁気検出部に第１、第２磁気抵抗相違部の先端がそれぞ
れさしかかるまでは、各検出コイルは同じ大きさの電圧
を出力している。時刻ｔ0 で各磁気検出部を第１、第２
磁気抵抗相違部が通過し始めると、微小幅の磁気検出部
に第１磁気抵抗相違部が位置する部分の幅が変位に比例
して直線的に増加するため、該磁気検出部の磁気抵抗は
これに反比例して減少する。従って、図３の検出コイル
Ｃ１の出力電圧ｖ1 は、包絡線４３で示すように、磁気
スケールの変位に比例して振幅が増加する。一方図３の
検出コイルＣ２の出力電圧ｖ2 は、包絡線４４で示すよ
うに、磁気スケールの変位に関わらず一定の振幅とな
る。図４（ｃ）において、両検出コイルＣ１、Ｃ２の出
力の差ｖ1 −ｖ2 は、は包絡線４６で示すように、磁気
スケールの変位につれて漸減し、時刻ｔ1 で０となり、
以降漸増するの振幅となる。このｖ1 −ｖ2 の増幅され
た電圧の絶対値が差動増幅器から出力される。図４
（ｄ）において、この差動増幅器の出力が検波器で検波
されて搬送波（励磁用交流）が除去され、その振幅の波
形である図４（ｃ）の包絡線４６の正側が検波器の出力
電圧ｖ3 として出力され、図示するように、磁気スケー
ルの変位に直線的に比例した出力信号が得られる。従っ
て、直線性のよい変位センサとして用いることができ
る。また、この信号はアナログ信号であり、磁気ストラ
イプを用いた場合のように、信号のデジタル性から分解
能が規定されることはない。なお、時刻ｔ1 で出力が０
となるようにしているのはこれをスケール位置の基準と
して用いるためである。また、図４において、説明を判
り易くするため、搬送波の周期を長く描いてあるが、実
際の搬送波は十分高周波でありこれにより検波出力の分
解能が制約されることはない。Next, the operation will be described with reference to FIGS. 3 and 4. In FIGS. 4A and 4B, if the magnetic scale moves in the direction of the arrow in FIG. 1, until the tips of the first and second magnetoresistive different portions reach the respective magnetic detection portions at time t 0. , Each detection coil outputs the same voltage. At time t 0 , each of the magnetic detectors is set to the first and second positions.
When the magnetic resistance different portion begins to pass, the width of the portion where the first magnetic resistance different portion is located in the magnetic detection portion having a minute width linearly increases in proportion to the displacement, and thus the magnetic resistance of the magnetic detection portion is reduced. It decreases in inverse proportion to this. Therefore, the output voltage v 1 of the detection coil C1 in FIG. 3 increases in amplitude in proportion to the displacement of the magnetic scale, as shown by the envelope 43. On the other hand, the output voltage v 2 of the detection coil C2 in FIG. 3 has a constant amplitude regardless of the displacement of the magnetic scale, as shown by the envelope 44. In FIG. 4C, the difference v 1 −v 2 between the outputs of the detection coils C1 and C2 gradually decreases as the magnetic scale is displaced, as indicated by the envelope 46, and becomes 0 at time t 1 ,
After that, the amplitude gradually increases. The absolute value of the amplified voltage of the v 1 -v 2 is output from the differential amplifier. Figure 4
In (d), the output of the differential amplifier is detected by the detector to remove the carrier wave (excitation AC), and the positive side of the envelope 46 of FIG. 4 (c), which is the waveform of the amplitude, is the output of the detector. The voltage v 3 is output, and as shown, an output signal linearly proportional to the displacement of the magnetic scale is obtained. Therefore, it can be used as a displacement sensor having good linearity. Further, this signal is an analog signal, and the resolution is not defined by the digital nature of the signal as in the case of using a magnetic stripe. The output is 0 at time t 1.
The reason for this is to use this as a reference for the scale position. Also, in FIG. 4, the period of the carrier wave is drawn long for the sake of easy understanding, but the actual carrier wave has a sufficiently high frequency, so that the resolution of the detection output is not restricted.
【００１２】つぎに、温度補償について図５より説明す
る。図５において、上述のように２つの磁気検出部には
共通に励磁された磁束が供給されているので、例えば第
１の磁気抵抗相違部の側の検出コイル出力電圧ｖ1 が温
度変化に対して実線で示すように変化すると、第２の磁
気抵抗相違部の側の検出コイル出力電圧ｖ2 も温度変化
に対して一点鎖線で示すように同様に変化する。従っ
て、両出力電圧の差ｖ1−ｖ2 は、温度変化に対して点
線で示すようにほぼ一定となり、温度補償がなされる。Next, temperature compensation will be described with reference to FIG. In FIG. 5, since the magnetic fluxes that are commonly excited are supplied to the two magnetic detection units as described above, for example, the detection coil output voltage v 1 on the side of the first magnetic resistance different portion changes with temperature. Then, as shown by the solid line, the detection coil output voltage v 2 on the side of the second magnetic resistance different portion also changes with temperature as shown by the dashed line. Therefore, the difference v 1 -v 2 between the two output voltages becomes almost constant with respect to the temperature change as shown by the dotted line, and the temperature is compensated.
【００１３】なお、本発明は上述の実施例に限定される
ものではなく、他の形態でも適用することができる。例
えば、図１において、第１及び第２磁気抵抗相違部２、
３は凹形状としてもよく、この場合は図４（ａ）の出力
電圧ｖ1 は磁気スケールの変位につれて（磁気抵抗が増
加するため）減少するものとなるが、得られる効果は同
様である。また、第１及び第２磁気抵抗相違部２、３は
いずれか一方が溝で他方が凸形状であっても同様の効果
が得られる。また、この磁気抵抗相違部２、３を被検出
部１ａの磁性体中にこれと透磁率の異なる材料で形成し
てもよく、この場合も同様の効果が得られる。また、第
２磁気抵抗相違部３は、図１の長方形に代えて、第１磁
気抵抗相違部２と異なる３角形状としてもよく、この場
合にも出力の直線性が得られ、かつ温度補償もなされ、
従って長方形の場合と同様の効果が得られる。さらに、
第１磁気抵抗相違部２を所定の関数で定義される曲線形
状としてもよい。この場合には第１磁気抵抗相違部２か
らの出力を当該所定の関数を用いて直線性を有するよう
に変換する回路を付加することにより、同様の効果が得
られる。またさらに、第１及び第２磁気抵抗相違部２、
３をそれぞれ異なる関数で定義される曲線形状とし、そ
れぞれの出力をそれぞれの関数を用いて直線性を有する
ように変換する回路を付加することととしても、同様の
効果が得られる。The present invention is not limited to the above embodiment, but can be applied to other forms. For example, in FIG. 1, the first and second magnetoresistive different portions 2,
3 may have a concave shape. In this case, the output voltage v 1 in FIG. 4A decreases with the displacement of the magnetic scale (because the magnetic resistance increases), but the same effect can be obtained. Further, the same effect can be obtained even if one of the first and second magnetic resistance different portions 2 and 3 has a groove and the other has a convex shape. Further, the magnetic resistance different portions 2 and 3 may be formed in the magnetic body of the detected portion 1a with a material having a magnetic permeability different from that of the magnetic body. In this case, the same effect can be obtained. Further, the second magnetic resistance different portion 3 may have a triangular shape different from the first magnetic resistance different portion 2 instead of the rectangular shape in FIG. 1, and in this case as well, linearity of the output is obtained and the temperature compensation is performed. Also done,
Therefore, the same effect as in the case of the rectangle can be obtained. further,
The first magnetic resistance different portion 2 may have a curved shape defined by a predetermined function. In this case, the same effect can be obtained by adding a circuit for converting the output from the first magnetoresistive different portion 2 so as to have linearity by using the predetermined function. Furthermore, the first and second magnetic resistance different portions 2,
Similar effects can be obtained even if 3 is a curve shape defined by different functions and a circuit for converting each output so as to have linearity is added using each function.
【００１４】[0014]
【発明の効果】本発明の磁気式ストローク検出センサは
上述のように、被検出体に並設された長手方向に幅が直
線的に変化する第１の磁気抵抗相違部と長手方向に幅が
変化しないか又は第１の磁気抵抗相違部と異なって長手
方向に幅が直線的に変化する第２の磁気抵抗相違部を、
共通に励磁された磁気検出部に同時通過させ、その２つ
の磁気抵抗の変化に応じた信号の差を出力するものであ
るので、被検出体の変位量に直線的に比例又は反比例す
る検出信号がアナログ信号として得られる。従って、従
来の磁気ストライプを用いた場合のように、信号のデジ
タル性から分解能が規定されることはなく、またその出
力の直線性から分解能の限界を小さくすることが可能で
ある。また、アナログ信号であることから方向検知が不
要であり、信号処理には差動回路を要するのみで、従来
のように演算回路は不要であるため信号処理回路を簡略
化することが可能である。さらに、温度補償も可能であ
る。As described above, the magnetic stroke detection sensor of the present invention has a width in the longitudinal direction which is different from that of the first magnetic resistance different portion which is arranged in parallel on the object to be detected and whose width changes linearly in the longitudinal direction. A second magnetic resistance difference portion which does not change or whose width changes linearly in the longitudinal direction unlike the first magnetic resistance difference portion,
Since the signals are simultaneously passed through the commonly excited magnetic detectors and the difference between the two signals is output according to the change in the magnetic resistance, a detection signal that is linearly or inversely proportional to the displacement of the object to be detected. Is obtained as an analog signal. Therefore, unlike the case where the conventional magnetic stripe is used, the resolution is not defined by the digitality of the signal, and the linearity of the output can reduce the resolution limit. Further, since it is an analog signal, direction detection is unnecessary, only a differential circuit is required for signal processing, and an arithmetic circuit is not required as in the conventional case, so that the signal processing circuit can be simplified. . Furthermore, temperature compensation is also possible.
【図１】本発明の磁気式ストローク検出センサの構成を
示す概要図である。FIG. 1 is a schematic diagram showing a configuration of a magnetic stroke detection sensor of the present invention.
【図２】検出体の外観図である。FIG. 2 is an external view of a detection body.
【図３】信号処理回路の構成を示す回路図である。FIG. 3 is a circuit diagram showing a configuration of a signal processing circuit.
【図４】信号処理回路の動作を示す電圧グラフ図であ
る。FIG. 4 is a voltage graph diagram showing the operation of the signal processing circuit.
【図５】温度補償を示す電圧─温度グラフ図である。FIG. 5 is a voltage-temperature graph showing temperature compensation.
【図６】従来の磁気式ストローク検出センサの構成を示
す概要図である。FIG. 6 is a schematic diagram showing a configuration of a conventional magnetic stroke detection sensor.
１ 磁気スケール（被検出体） ２ 第１の磁気抵抗相違部 ３ 第２の磁気抵抗相違部 ４ 検出体 ６ 磁気検出部 ７ 磁気検出部 ９ 差動増幅器（差動回路の要素） ４０ 信号処理回路（差動回路） DESCRIPTION OF SYMBOLS 1 Magnetic scale (object to be detected) 2 1st magnetic resistance different part 3 2nd magnetic resistance different part 4 Detector 6 Magnetic detection part 7 Magnetic detection part 9 Differential amplifier (element of differential circuit) 40 Signal processing circuit (Differential circuit)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 右田 実雄 高知県香美郡香我美町下分684番地１ 株 式会社ミネルバ高知工場内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mio Uda 684 Shimobu, Kagami-cho, Kami-gun, Kochi Prefecture 1 Minerva Kochi factory
Claims (1)
る関数で定義される曲線的に変化する第１の磁気抵抗相
違部と長手方向に幅が変化しない又は前記第１の磁気抵
抗相違部と異なって長手方向に幅が直線的に変化する第
２の磁気抵抗相違部とを並設してなる被検出体と、 この被検出体の第１及び第２の磁気抵抗相違部が同時に
それぞれ通過する微小幅で延在する２つの磁気検出部を
有し、この２つの磁気検出部に共通に励磁された磁束を
供給して各磁気検出部の磁気抵抗の変化に応じた信号を
それぞれ出力する検出体と、 この検出体から出力される前記２つの信号の差を出力す
る差動回路とを備えてなる磁気式ストローク検出セン
サ。1. A first magnetoresistive difference portion in which the width changes linearly in the longitudinal direction or changes in a curve defined by a certain function, and the width does not change in the longitudinal direction or the first magnetoresistive difference. And a second magnetic resistance different portion having a width that linearly changes in the longitudinal direction, which is different from the portion, and the first and second magnetic resistance different portions of the detection object are provided at the same time. It has two magnetic detectors that extend with a very small width that passes through each, and supplies a magnetic flux that is excited in common to these two magnetic detectors to generate signals corresponding to changes in the magnetic resistance of each magnetic detector. A magnetic stroke detection sensor comprising a detector for outputting and a differential circuit for outputting a difference between the two signals output from the detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34014193A JPH07159107A (en) | 1993-12-06 | 1993-12-06 | Magnetic type stroke detecting sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34014193A JPH07159107A (en) | 1993-12-06 | 1993-12-06 | Magnetic type stroke detecting sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07159107A true JPH07159107A (en) | 1995-06-23 |
Family
ID=18334123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34014193A Pending JPH07159107A (en) | 1993-12-06 | 1993-12-06 | Magnetic type stroke detecting sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07159107A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075106A (en) * | 2001-08-31 | 2003-03-12 | Tadatoshi Goto | Position detection device |
| JP2006525529A (en) * | 2003-05-06 | 2006-11-09 | エスアールアイ インターナショナル | System and method for recording piston rod position information in a magnetic layer on a piston rod |
| JP2009144843A (en) * | 2007-12-14 | 2009-07-02 | Aisin Ai Co Ltd | Control method of gear transmission |
-
1993
- 1993-12-06 JP JP34014193A patent/JPH07159107A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075106A (en) * | 2001-08-31 | 2003-03-12 | Tadatoshi Goto | Position detection device |
| JP2006525529A (en) * | 2003-05-06 | 2006-11-09 | エスアールアイ インターナショナル | System and method for recording piston rod position information in a magnetic layer on a piston rod |
| JP2009144843A (en) * | 2007-12-14 | 2009-07-02 | Aisin Ai Co Ltd | Control method of gear transmission |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3186403B2 (en) | Magnetic sensor and signal conversion circuit | |
| JPH0626884A (en) | Position detection device | |
| JPH0611358A (en) | Position measuring device | |
| US4712083A (en) | Position sensor | |
| US6717399B2 (en) | Magnetic sensing device with offset compensation | |
| JP2005531007A (en) | Magnetoresistive sensor | |
| JPH07159107A (en) | Magnetic type stroke detecting sensor | |
| CA2358205A1 (en) | Utilization of a magneto-resistive material | |
| JPH0933204A (en) | Measuring method surely measuring space between conductive reaction rail and functional surface relatively moved to conductive reaction rail and sensor fitted to measuring method thereof | |
| JPH10206104A (en) | Position detecting apparatus | |
| GB2188157A (en) | Magnetic sensor arrangements | |
| EP0608417B1 (en) | Method for sensing part where electromagnetic characteristics are changed, and device thereof | |
| JP3220278B2 (en) | Position detection device | |
| JPH0424574A (en) | Detecting device of magnetism | |
| JPH08233867A (en) | Bridge detection circuit | |
| JPH069306Y2 (en) | Position detector | |
| JP6644343B1 (en) | Zero flux type magnetic sensor | |
| JPH03243801A (en) | Noncontact type range finder | |
| JPS58204313A (en) | Detecting head of linear scale | |
| JP2000249573A (en) | Magnetic detector | |
| JPH02194316A (en) | Displacement detecting device | |
| JP2001091612A (en) | Magnetic field strength sensor and sensor built-in non- contact magnetic measuring device | |
| JP2546281B2 (en) | Origin detection part of magnetic head for magnetic encoder | |
| JP3492825B2 (en) | Magnetoresistive displacement sensor | |
| JPH0735573A (en) | Magnetic stroke detecting sensor |