JPH01253137A - Magnetic sensor - Google Patents
Magnetic sensorInfo
- Publication number
- JPH01253137A JPH01253137A JP63078174A JP7817488A JPH01253137A JP H01253137 A JPH01253137 A JP H01253137A JP 63078174 A JP63078174 A JP 63078174A JP 7817488 A JP7817488 A JP 7817488A JP H01253137 A JPH01253137 A JP H01253137A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency
- coil
- sensor
- magnetic core
- 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
- 230000010355 oscillation Effects 0.000 claims abstract description 20
- 238000013459 approach Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 abstract description 3
- 230000035699 permeability Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
この発明は高周波発掘回路によって励振されるコイルに
より磁性体の接近を検出する磁気センサーに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic sensor that detects the approach of a magnetic body using a coil excited by a high frequency excavation circuit.
従来この種の磁気センサーは第４図ｒ（示すように構成
されている。すなわちセンサー１１Ｓ１に！等価２ｆｆ
１心アモルファスワイヤーに巻かれたコイル４１、４２
により構成され、そのセンサ一部１ １／Ｃマルチバイ
ブレーターブリツジ２ｌが接続され、さらにこのブリッ
ジの出力端にはアクティブフィルター２２が接続される
。Conventionally, this type of magnetic sensor is constructed as shown in FIG.
Coils 41 and 42 wound around a single-core amorphous wire
The sensor part 1 is connected to a 1/C multivibrator bridge 2l, and an active filter 22 is connected to the output end of this bridge.
そして磁芯ｌ３がセンサー＠ＩＩＣ接近すると一方のコ
イル４ｌと他方のコイル４２との間隔が太きいため他方
のコイル４２は磁芯ｌ３の影響を受けるが、一方のコイ
ル４ｌはその影響を受けない。このためマルチバイブレ
ータ−ブリッジ２１の出力に電圧差が生じるのでこれを
アクティブフィルター２２を通して出力する方法を採っ
ている。When the magnetic core l3 approaches the sensor @IIC, the distance between one coil 4l and the other coil 42 is large, so the other coil 42 is affected by the magnetic core l3, but one coil 4l is not affected by it. . For this reason, a voltage difference occurs in the output of the multivibrator bridge 21, so a method is adopted in which this voltage difference is outputted through the active filter 22.
〔この発明が解決しようとする問題点〕第４図に示す磁
気センサーにあってはセンサー部ｌの磁芯長をある値以
上に短縮することができない。このためセンサーｓ１の
長さが長く、いきおいセンサー全体の形状が大きくなる
欠点がある〔発明の目的〕
この発明はこのような従来の問題点にがんが今、センサ
一部の形状を極力小さくすることによりセンサー全体の
大きさを縮少することを目的とする。[Problems to be Solved by the Invention] In the magnetic sensor shown in FIG. 4, the magnetic core length of the sensor portion l cannot be shortened beyond a certain value. For this reason, the length of the sensor s1 is long, and the overall shape of the sensor becomes large.[Object of the Invention] This invention solves these conventional problems by reducing the shape of a part of the sensor as much as possible. The aim is to reduce the overall size of the sensor by doing so.
この発明はその目的を達成するために、零磁歪アモルフ
ァスな磁芯とするコイルを形成し、このコイルと高周波
発振器により発振回路を形成する。さらにこの発振回路
に周波数弁別回路を接続する。In order to achieve the object of the present invention, a coil having a zero magnetostriction amorphous magnetic core is formed, and an oscillation circuit is formed by this coil and a high frequency oscillator. Furthermore, a frequency discrimination circuit is connected to this oscillation circuit.
周波数弁別回路の弁別周波数をある値に設定した状態で
発磁体をセンサ一部に接近させることにより、発振回路
の周波数か変化する。そして設定した値以上に周波数が
変化したらオン・オフ信号によりその変化を出力する。By bringing a magnetic generator close to a part of the sensor with the discrimination frequency of the frequency discrimination circuit set to a certain value, the frequency of the oscillation circuit changes. When the frequency changes by more than the set value, the change is output by an on/off signal.
これによって発磁体の接近が検出される。This allows the approach of the magnet to be detected.
以下図によってこの発明の一実施例ｒＣついて説明する
。An embodiment rC of the present invention will be explained below with reference to the drawings.
すなわちＷ、１図および第２図においてセンサー部１は
アモルファスワイヤーの磁芯とコイルを主体に形成され
る。すなわちこのセンサ一部は磁芯長１０龍、ワイヤー
径２０μｍの零磁アモルファスワイヤー（Ｃｏａｘ Ｆ
ｅ４Ｓｉｔｓ Ｂｔｓ原子％）をＭ本収束して磁芯３を
形成したものに導線をＮ回巻きつけてコイル４を形成し
、これをハウジング６に収容することによって形成され
る。That is, in FIGS. 1 and 2, the sensor section 1 is mainly formed of an amorphous wire magnetic core and a coil. In other words, a part of this sensor is made of zero magnetic amorphous wire (Coax F) with a magnetic core length of 10 mm and a wire diameter of 20 μm.
The coil 4 is formed by converging M pieces of e4Sits (Bts atomic %) to form the magnetic core 3, winding a conducting wire N times around it, and housing the coil 4 in the housing 6.
第１のＣ−ＭＯ８ＩＣ７と第２のＣ−ＭＯ８１Ｃ８およ
びコンデンサ９ ＶｃよりＣＲ発振回路１１が形成され
、こＯＣＲ発振回路のＲの部分すなわち第１のＣ−ＭＯ
８１Ｃの端子Ａ、Ｂ間にセンサ一部１が接続される。Ｃ
Ｒ発振回路１１の出力端には周波数弁別（ロ）路１２が
接続される。A CR oscillation circuit 11 is formed by the first C-MO8 IC7, the second C-MO81C8, and the capacitor 9Vc, and this is the R part of the OCR oscillation circuit, that is, the first C-MO
Sensor part 1 is connected between terminals A and B of 81C. C
A frequency discrimination (b) path 12 is connected to the output end of the R oscillation circuit 11.
今、ｉｉ図の状態においてＣＲ＠ｍ回路１１がある一定
の周波数で発振しているばあいに、センサ一部ｌに発磁
体１３すなわち磁芯を接近させるとアモルファスワイヤ
ーの磁芯３の透磁率が変化し、その発振回路１１の発振
周波数が変わる。すなわち発磁体１３がセンサ一部１か
ら遠い距離にあるときはＣＲ発振回路１１の発振周波数
は第４図に示すように比較的低いか約１０ｍ１の距離を
境ｌ／ｃ急激に高まる。Now, when the CR@m circuit 11 oscillates at a certain frequency in the state shown in Figure ii, when the magnetizing body 13, that is, the magnetic core, approaches the sensor part l, the magnetic permeability of the magnetic core 3 of the amorphous wire increases. changes, and the oscillation frequency of the oscillation circuit 11 changes. That is, when the magnetic generator 13 is far away from the sensor part 1, the oscillation frequency of the CR oscillation circuit 11 is relatively low as shown in FIG. 4, or increases rapidly by l/c after a distance of about 10 m1.
そこでこの発嶽周波数の変化を周波数弁別回路１２ＶＣ
よって弁別する。そしてこの精米なオン・オフ信号とし
て出力する。Therefore, the frequency discrimination circuit 12VC detects the change in the starting frequency.
Therefore, discriminate. Then, this refined on/off signal is output.
この発明は上述のように零ｍ＝アモルファスの磁芯３に
導線を巻回することによりコイル４を形成し、このコイ
ルを高周波を以って励振する発徹回路１１に接続し、さ
らにこの発振回路の出力端に周波数弁別回路１２を接続
しているので、コイル４ ＶＣ発磁体１３が接近したと
きにある距離を境にして発掘周波数が急激に変化し、し
たかつてこの変化をオン・オフ信号により確実に判定す
ることができる。しかもその検出は従来のように信号の
差＃ｌＪＪによる必要がないので、七ン丈一部１を１１
つのコイル４で事足り、いきおいセンサ一部ｌの寸法が
小さ（、かつ回路構成も簡単となり、狭い空間での取付
けが容易となる。As described above, this invention forms a coil 4 by winding a conductive wire around an amorphous magnetic core 3, connects this coil to an oscillation circuit 11 that excites it with high frequency, and further oscillates the oscillation. Since the frequency discrimination circuit 12 is connected to the output end of the circuit, when the coil 4 and the VC magnet 13 approach, the excavation frequency changes rapidly after a certain distance, and this change can be used as an on/off signal. This allows reliable determination. Moreover, the detection does not need to be based on the signal difference #lJJ as in the conventional case.
One coil 4 is sufficient, and the dimensions of the vitality sensor part 1 are small (and the circuit configuration is simple, making it easy to install in a narrow space).
第１図はこの発明における磁気センサーの１実施例を示
す回路図、第２図はセンサ一部の縦断面図、第３図はセ
ンサーから発磁体までの距離に対する発振周波数の関係
を示す特性図、第４図は従来の磁気センサーの回路図で
ある。
ｌ・・・センサ一部、３・・・ｆｆｌ＋１７．４・・・
コイル、６・・・ハウジング、７・・・Ｃ−ＭＯ８１Ｃ
，１３・・・Ｃ−ＭＯ８ＩＣ１９・・・コンデンサ、１
１・・・ＣＲ発振回路、１２・・・周波数弁別回路、１
３・・・発磁体。
特 許 出 願 人 山武）・ネウエル株式会社ｒ
ｌ′″“−。
−枝記距離（＋ｗ）Fig. 1 is a circuit diagram showing one embodiment of the magnetic sensor according to the present invention, Fig. 2 is a vertical cross-sectional view of a part of the sensor, and Fig. 3 is a characteristic diagram showing the relationship between the oscillation frequency and the distance from the sensor to the magnetizing body. , FIG. 4 is a circuit diagram of a conventional magnetic sensor. l...part of the sensor, 3...ffl+17.4...
Coil, 6...Housing, 7...C-MO81C
,13...C-MO8IC19...Capacitor, 1
1...CR oscillation circuit, 12...Frequency discrimination circuit, 1
3... Magnetizing body. Patent applicant Yamatake) Newel Co., Ltd.
l′″“-. -Eki distance (+w)
Claims (1)
によりコイル（４）を形成し、このコイルを高周波を以
つて励振する発振回路（１１）に接続し、この発振回路
に周波数弁別回路（１２）を接続し、上記コイル（４）
に発磁体（１３）が接近することにより上記発振回路（
１１）の発振周波数を変化させ、この変化を上記周波数
弁別回路（１２）により判定することを特徴とする磁気
センサー。A coil (4) is formed by winding a conductive wire around a zero magnetostrictive amorphous magnetic core (3), and this coil is connected to an oscillation circuit (11) that excites with high frequency, and a frequency discrimination circuit is connected to this oscillation circuit. (12) and the above coil (4).
When the magnetizing body (13) approaches the oscillation circuit (
A magnetic sensor characterized in that the oscillation frequency of (11) is changed and this change is determined by the frequency discrimination circuit (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63078174A JPH01253137A (en) | 1988-04-01 | 1988-04-01 | Magnetic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63078174A JPH01253137A (en) | 1988-04-01 | 1988-04-01 | Magnetic sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01253137A true JPH01253137A (en) | 1989-10-09 |
Family
ID=13654591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63078174A Pending JPH01253137A (en) | 1988-04-01 | 1988-04-01 | Magnetic sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01253137A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5949293A (en) * | 1997-02-18 | 1999-09-07 | Japan System Development Co., Ltd. | Integrated circuit for measuring the distance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5923136B2 (en) * | 1976-06-16 | 1984-05-31 | 株式会社日立製作所 | counter circuit |
| JPS6323527A (en) * | 1986-07-11 | 1988-01-30 | Toyota Autom Loom Works Ltd | Rotation detector in compressor |
-
1988
- 1988-04-01 JP JP63078174A patent/JPH01253137A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5923136B2 (en) * | 1976-06-16 | 1984-05-31 | 株式会社日立製作所 | counter circuit |
| JPS6323527A (en) * | 1986-07-11 | 1988-01-30 | Toyota Autom Loom Works Ltd | Rotation detector in compressor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5949293A (en) * | 1997-02-18 | 1999-09-07 | Japan System Development Co., Ltd. | Integrated circuit for measuring the distance |
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