JPH03160321A - Magnetic rotary sensor - Google Patents
Magnetic rotary sensorInfo
- Publication number
- JPH03160321A JPH03160321A JP30060989A JP30060989A JPH03160321A JP H03160321 A JPH03160321 A JP H03160321A JP 30060989 A JP30060989 A JP 30060989A JP 30060989 A JP30060989 A JP 30060989A JP H03160321 A JPH03160321 A JP H03160321A
- Authority
- JP
- Japan
- Prior art keywords
- size
- rotation sensor
- magnetic rotation
- bias magnet
- detection direction
- 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 description 21
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Landscapes
- 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、磁気回転センサに関し、さらに詳しくは、
高精度で且つ小型化が可能な磁気回転センサに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic rotation sensor, and more specifically,
The present invention relates to a magnetic rotation sensor that is highly accurate and can be miniaturized.
［従来の技術］
従来、２相磁気回転センサで得る２つの出力波鋭の拉相
差の精度はーＭＲ素子の感磁部の配置のみが影響すると
考えられていた。[Prior Art] Conventionally, it has been thought that the accuracy of the phase difference between two output waves obtained by a two-phase magnetic rotation sensor is affected only by the arrangement of the magnetic sensing part of the MR element.
したがって、２つの出力波形の位相差を正確に９０”に
するために、ＭＲ素子の感磁部を被検出体の歯の１／４
ピッチに正確に合わせて配置することが行われていた。Therefore, in order to make the phase difference between the two output waveforms exactly 90", the magnetic sensing part of the MR element should be set to 1/4 of the tooth of the object to be detected.
They were placed to match the pitch accurately.
一方、バイアス磁石の検知方向サイズについては特に考
慮されていなかったが、従来の高精度の２相磁気回転セ
ンサは比較的大型であり、バイアス磁石の検知方向サイ
ズはＭＲ素子のそれの４倍以上にされていた。On the other hand, the size of the bias magnet in the detection direction was not particularly considered, but conventional high-precision two-phase magnetic rotation sensors are relatively large, and the size of the bias magnet in the detection direction is more than four times that of the MR element. was being treated as
［発明が解決しようとする課題］
上記従来の２相磁気回転センサは、比較的大型であり、
小型であることが要求される用途には適さない問題点が
ある。[Problems to be Solved by the Invention] The conventional two-phase magnetic rotation sensor described above is relatively large;
There is a problem that it is not suitable for applications that require small size.
このため、バイアス磁石の大きさを小さくすることによ
る小型化が図られたが、位相差の精度が低下してしまう
という新たな問題点を生じた。For this reason, although miniaturization has been attempted by reducing the size of the bias magnet, a new problem has arisen in that the accuracy of the phase difference is reduced.
そこで、この発明の目的は、２つの出力波形の位相差を
所定の精度に維持し且つ小型化可能としｆ．− 磁ｍ同
舵センサを捏イ社することにある７［課題を解決するた
めの手段コ
第１の観点では、この発明は、ＭＲ素子をバイアス磁石
の上方に有する磁気回転センサにおいて、バイアス磁石
の検知方向サイズがＭＲ素子の検知方向サイズの１、０
倍以上且つ４倍以下であることを特徴とする磁気回転セ
ンサを提供する。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to maintain the phase difference between two output waveforms at a predetermined accuracy and to enable miniaturization.f. - In a first aspect, the present invention provides a magnetic rotation sensor having an MR element above a bias magnet. The detection direction size of the MR element is 1 or 0 of the detection direction size of the MR element.
Provided is a magnetic rotation sensor characterized in that the magnetic rotation sensor is more than twice and less than four times.
第２の観点では、この発明は、ＭＲ素子をバイアス磁石
の上方に有する磁気回転センサにおいて、バイアス磁石
の検知方向サイズがＭＲ素子の検知方向サイズの２倍以
上且つ４倍以下であることを特徴とする磁気回転センサ
を提供する。In a second aspect, the present invention is characterized in that, in a magnetic rotation sensor having an MR element above a bias magnet, the size of the bias magnet in the detection direction is at least twice the size of the MR element in the detection direction and no more than 4 times the size of the MR element in the detection direction. A magnetic rotation sensor is provided.
［作用］
前記課題に鑑み、この発明の発明者が鋭意研究したとこ
ろ、バイアス磁石の検知方向サイズをＭＲ素子の検知方
向サイズの１，Ｏ倍以上且つ４倍以下とすることによっ
て、位相差の精度を９０”±５％に維持しつつ小型化で
きることを見出した。[Function] In view of the above-mentioned problems, the inventor of the present invention conducted extensive research and found that by setting the size of the bias magnet in the detection direction to 1.0 times or more and 4 times or less the size of the MR element in the detection direction, the phase difference can be reduced. It has been found that it is possible to downsize the device while maintaining accuracy at 90”±5%.
また、バイアス磁石の検知方向サイズをＭＲ素子の２倍
以上且つ４倍以下とすることによって、位相差の精度を
９０”±１％に維持しつつ小型化できることを見出した
。Furthermore, it has been found that by making the size of the bias magnet in the detection direction larger than twice and smaller than 4 times that of the MR element, it is possible to reduce the size while maintaining the precision of the phase difference at 90''±1%.
［実施例コ
以下、図に示す実施例に基づいてこの発明をさらに詳し
く説明する。なお、これによりこの発明が限定されるも
のではない。[Embodiments] The present invention will be explained in more detail below based on embodiments shown in the drawings. Note that this invention is not limited to this.
第２図は、この発明の一実施例の２相磁気回転センサＡ
を示すものである。FIG. 2 shows a two-phase magnetic rotation sensor A according to an embodiment of the present invention.
This shows that.
この２相磁気回転センサＡは、ＭＲ素子ｌと，バイアス
磁石２とを具備してなっている。This two-phase magnetic rotation sensor A includes an MR element 1 and a bias magnet 2.
ＸＭＲは、ＭＲ素子１の検知方向サイズで、６．３６ｍ
ｍである。ＸＭは、バイアス磁石２の検知方向サイズで
、１０．００ｍｍである。XMR is the detection direction size of MR element 1, which is 6.36 m.
It is m. XM is the size of the bias magnet 2 in the detection direction and is 10.00 mm.
この２相磁気回転センサＡは、従来の同等品よりも小型
であり（従来品のバイアス磁石の検知方向サイズは２０
．００ｍｍである。）、位相差の精度は９０”±５％で
あった。This two-phase magnetic rotation sensor A is smaller than conventional equivalent products (the size of the conventional product's bias magnet in the detection direction is 20
．． 00mm. ), the accuracy of the phase difference was 90”±5%.
第３図は、この発明の他の一実施例の２相磁気回転セン
サＢを示すものである。FIG. 3 shows a two-phase magnetic rotation sensor B according to another embodiment of the present invention.
この２相磁気回転センサＢは、ＭＲ素子１と，バイアス
磁石２とを具備してなっている。This two-phase magnetic rotation sensor B includes an MR element 1 and a bias magnet 2.
ＸＭＲは、ＭＲ素子１の検知方向サイズで、６．３６關
である。ＸＭは、バイアス磁石２の検知方向サイズで、
１３．００ｎｎ＋＋である。XMR is the size of the MR element 1 in the detection direction, which is 6.36 degrees. XM is the size of the bias magnet 2 in the detection direction,
13.00nn++.
この２相磁気回転センサＢは、従来の同等品よりも小型
であり、位相差の精度は９０”±１％以下であった。This two-phase magnetic rotation sensor B was smaller than a conventional equivalent product, and the accuracy of the phase difference was 90''±1% or less.
第１図に示すαは、縦軸に位相差の精度を取り、横軸に
ＸＭ／ＸＭＲを取った特性曲線である。ここでＡ，Ｂは
上記２相磁気回転センサＡ，Ｂに対応するデータである
。α shown in FIG. 1 is a characteristic curve in which the vertical axis represents the accuracy of phase difference and the horizontal axis represents XM/XMR. Here, A and B are data corresponding to the two-phase magnetic rotation sensors A and B.
［発明の効果］
この発明によれば、位相差の精度を９０”±５％に維持
し且つ小型化した磁気回転センサが得られる。また、位
相差の精度を９０”±１％に維持し且つ小型化した磁気
回転センサが得られる。[Effects of the Invention] According to the present invention, it is possible to obtain a magnetic rotation sensor that maintains the precision of the phase difference at 90"±5% and is miniaturized. It also maintains the precision of the phase difference at 90"±1%. Moreover, a miniaturized magnetic rotation sensor can be obtained.
第１図は２相磁気回転センサにおける位相差の精度とＭ
Ｒ素子，バイアス磁石それぞれの検知方向サイズの比の
関係図、第２図および第３図はそ刺νわ７の登叩の一宝
雄例の９珀琳蛸同軒セソ廿の構成図である。
（符号の説明）
Ａ，Ｂ・・・２相磁気回転センサ
Ｘ１・・バイアス磁石の検知方向サイズＸＭ１・・ＭＲ
素子の検知方向サイズ
α・・・特性曲線
１・・・ＭＲ素子
２・・・バイアス磁石。Figure 1 shows the accuracy of phase difference and M in a two-phase magnetic rotation sensor.
Figures 2 and 3 are diagrams showing the relationship between the size ratios in the sensing direction of the R element and the bias magnet, respectively, and are diagrams of the configuration of the 9-pin tako-douken seso-ya, which is an example of how to use the top of the 7. be. (Explanation of symbols) A, B... Two-phase magnetic rotation sensor X1... Bias magnet detection direction size XM1... MR
Element detection direction size α...Characteristic curve 1...MR element 2...Bias magnet.
Claims (1)
ンサにおいて、 バイアス磁石の検知方向サイズがＭＲ素子 の検知方向サイズの１．０倍以上且つ４倍以下であるこ
とを特徴とする磁気回転センサ。 ２、バイアス磁石の検知方向サイズがＭＲ素子の検知方
向サイズの２倍以上であることを特徴とする請求項１の
磁気回転センサ。[Claims] 1. A magnetic rotation sensor having an MR element above a bias magnet, characterized in that the size of the bias magnet in the detection direction is 1.0 times or more and 4 times or less the size of the MR element in the detection direction. Magnetic rotation sensor. 2. The magnetic rotation sensor according to claim 1, wherein the size of the bias magnet in the detection direction is at least twice the size of the MR element in the detection direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30060989A JPH03160321A (en) | 1989-11-18 | 1989-11-18 | Magnetic rotary sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30060989A JPH03160321A (en) | 1989-11-18 | 1989-11-18 | Magnetic rotary sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03160321A true JPH03160321A (en) | 1991-07-10 |
Family
ID=17886913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30060989A Pending JPH03160321A (en) | 1989-11-18 | 1989-11-18 | Magnetic rotary sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03160321A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100561288B1 (en) * | 2004-07-14 | 2006-03-15 | 미츠비시덴키 가부시키가이샤 | Magnetic detector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970978A (en) * | 1982-10-16 | 1984-04-21 | Matsushita Electric Ind Co Ltd | Magnetic sensor and phase/displacement detector |
| JPS59142417A (en) * | 1983-02-03 | 1984-08-15 | Nippon Denso Co Ltd | Magnetism detecting device |
| JPS6061661A (en) * | 1983-09-16 | 1985-04-09 | Sony Corp | Cyclic signal reader |
-
1989
- 1989-11-18 JP JP30060989A patent/JPH03160321A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970978A (en) * | 1982-10-16 | 1984-04-21 | Matsushita Electric Ind Co Ltd | Magnetic sensor and phase/displacement detector |
| JPS59142417A (en) * | 1983-02-03 | 1984-08-15 | Nippon Denso Co Ltd | Magnetism detecting device |
| JPS6061661A (en) * | 1983-09-16 | 1985-04-09 | Sony Corp | Cyclic signal reader |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100561288B1 (en) * | 2004-07-14 | 2006-03-15 | 미츠비시덴키 가부시키가이샤 | Magnetic detector |
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