JPH0637712U - Rotation sensor - Google Patents
Rotation sensorInfo
- Publication number
- JPH0637712U JPH0637712U JP7370892U JP7370892U JPH0637712U JP H0637712 U JPH0637712 U JP H0637712U JP 7370892 U JP7370892 U JP 7370892U JP 7370892 U JP7370892 U JP 7370892U JP H0637712 U JPH0637712 U JP H0637712U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic detection
- detection coil
- rotating body
- rotation sensor
- 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.)
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Links
- 230000005291 magnetic effect Effects 0.000 claims abstract description 98
- 238000001514 detection method Methods 0.000 claims abstract description 57
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005330 Barkhausen effect Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
(57)【要約】
【目的】 構造を複雑にすることなく、回転体の偏心に
起因した出力のむらや、低速回転時におけるノイズの影
響を小さく抑える。それにより、装置の小型化、低コス
ト化と、検出精度の向上を共に可能にする。
【構成】 双安定磁気特性を有する磁性材料を磁芯３ｅ
とする磁気検出コイル３と、双安定磁気特性を有しない
磁性材料を磁芯４ｅとする磁気検出コイル４とを対に
し、両磁気検出コイル３、４の端面を磁気リング１の外
周面に対向させる。両磁気検出コイル３、４の銅線３
ｂ、４ｂの端末を、互いの出力電圧の正弦波成分が相殺
し合うように結線する。
(57) [Abstract] [Purpose] To suppress the effects of output unevenness due to eccentricity of the rotor and noise at low speed rotation without complicating the structure. As a result, it is possible to reduce the size and cost of the device and improve the detection accuracy. [Composition] A magnetic material having bistable magnetic characteristics is used as the magnetic core 3e.
And a magnetic detection coil 4 having a magnetic core 4e made of a magnetic material having no bistable magnetic characteristics as a pair, and the end faces of both magnetic detection coils 3 and 4 face the outer peripheral surface of the magnetic ring 1. Let Copper wire 3 of both magnetic detection coils 3 and 4
The terminals b and 4b are connected so that the sine wave components of the output voltages cancel each other out.
Description
【０００１】[0001]
本考案は、自動車の車輪速センサ等に用いられる回転センサ、とりわけ、磁気 的な検出方法によって回転状態を検出する回転センサに関する。 The present invention relates to a rotation sensor used for a vehicle wheel speed sensor or the like, and more particularly to a rotation sensor for detecting a rotation state by a magnetic detection method.
【０００２】[0002]
この種の回転センサとして、回転体の外周面に磁束源としての永久磁石を複数 個配設する一方で、固定部材側に磁気検出コイルを配設し、回転体の回転に伴っ て磁気検出コイルに誘起される電圧の変化から回転体の回転状態を検出するよう にしたものが開発されている。 As this type of rotation sensor, a plurality of permanent magnets as magnetic flux sources are arranged on the outer peripheral surface of the rotating body, while a magnetic detection coil is arranged on the fixed member side, and the magnetic detection coil is rotated as the rotating body rotates. A device has been developed that detects the rotating state of a rotating body from changes in the voltage induced in the rotor.
【０００３】 ところが、この回転センサにおいては、回転体の偏心によって出力電圧の波形 にむらが生じたり、回転体の低速回転時に、磁気検出コイルの出力電圧が小さく なってノイズの影響が大きくなるという不具合がある。このため、これに対処す るものとして、従来、例えば、特開昭６２−２３９０２０号公報に示されるよう なものが案出されている。However, in this rotation sensor, the waveform of the output voltage becomes uneven due to the eccentricity of the rotating body, and when the rotating body rotates at a low speed, the output voltage of the magnetic detection coil becomes small and the influence of noise becomes large. There is a defect. Therefore, as a means for dealing with this, there has been conventionally proposed a device as disclosed in, for example, Japanese Patent Laid-Open No. 62-239020.
【０００４】 この従来の回転センサは、回転体の外周面に複数の永久磁石を配設する一方で 、回転体を囲繞する固定部材側の複数箇所に磁気検出コイルを配設し、これらの 磁気検出コイルを直列に結線して各磁気検出コイルに誘起される電圧を加え合わ せたものを出力電圧とすることにより、回転体の偏心による出力電圧への影響を 平均化するようになっている。また、この回転センサの各磁気検出コイルは、双 安定磁気特性を有する磁性体（大バルクハウゼン効果を得られる磁性体）が磁芯 として用いられ、回転体の回転に伴って磁気検出コイルを貫く磁束が変化すると 、正弦波状の電圧波形に大バルクハウゼン効果による急峻なパルス波形が重畳さ れるようになっている。この大バルクハウゼン効果による急峻なパルス波形は回 転体の回転速度に関係なくほぼ一定の大きさが得られるため、この回転センサに おいては、出力電圧（各磁気検出コイルの誘起電圧を加え合わせたもの）のうち のパルス波形部のみが用いられ、それにより、回転体の低速回転時にも、ノイズ の影響をさして受けることなく正確に回転状態を検出出来るようになっている。In this conventional rotation sensor, a plurality of permanent magnets are arranged on the outer peripheral surface of the rotating body, while magnetic detection coils are arranged at a plurality of positions on the side of a fixed member surrounding the rotating body. The effect of the eccentricity of the rotating body on the output voltage is averaged by connecting the detection coils in series and adding the voltage induced in each magnetic detection coil as the output voltage. . Further, each magnetic detection coil of this rotation sensor uses a magnetic body having bistable magnetic characteristics (a magnetic body capable of obtaining the large Barkhausen effect) as a magnetic core, and penetrates the magnetic detection coil as the rotary body rotates. When the magnetic flux changes, a steep pulse waveform due to the large Barkhausen effect is superimposed on the sinusoidal voltage waveform. The steep pulse waveform due to the large Barkhausen effect has a substantially constant magnitude regardless of the rotation speed of the rotating body.Therefore, in this rotation sensor, the output voltage (the induced voltage of each magnetic detection coil is added). Only the pulse waveform part of the (combined) is used, so that even when the rotating body rotates at low speed, the rotating state can be accurately detected without being affected by noise.
【０００５】[0005]
しかしながら、この従来の回転センサの場合、固定部材側の複数箇所に磁気検 出コイルを配設しなければならないため、構造が複雑になり、装置の大型化や製 造コストのアップを招くという不具合がある。 However, in the case of this conventional rotation sensor, the magnetic detection coils have to be arranged at a plurality of positions on the fixed member side, which complicates the structure and causes an increase in the size of the device and an increase in manufacturing cost. There is.
【０００６】 そこで本考案は、構造を複雑にすることなく、回転体の偏心に起因した出力の むらや、低速回転時におけるノイズの影響を小さく抑えられるようにして、小型 、低コストで、しかも、検出精度の高い回転センサを提供しようとするものであ る。Therefore, the present invention is small in size, low in cost, and capable of suppressing the unevenness of the output due to the eccentricity of the rotating body and the influence of the noise at the time of low speed rotation without complicating the structure. , It aims to provide a rotation sensor with high detection accuracy.
【０００７】[0007]
本考案は上述した課題を解決するための手段として、回転体と固定部材のうち の一方に磁束源を、他方に磁気検出コイルを配設し、磁気検出コイルに誘起され る電圧の変化から回転体の回転を検出するようにした回転センサにおいて、双安 定磁気特性を有する磁性材料を磁芯とする磁気検出コイルと、双安定磁気特性を 有しない磁性材料を磁芯とする磁気検出コイルとを対にし、両磁気検出コイルを 互いの出力電圧の正弦波成分を相殺するように結線した。 As a means for solving the above-mentioned problems, the present invention provides a magnetic flux source on one of a rotating body and a fixed member and a magnetic detection coil on the other, and rotates from a change in voltage induced in the magnetic detection coil. In a rotation sensor that detects the rotation of the body, a magnetic detection coil whose magnetic core is a magnetic material having bistable magnetic characteristics, and a magnetic detection coil whose magnetic core is a magnetic material which does not have bistable magnetic characteristics. And the two magnetic detection coils were connected so as to cancel the sine wave component of the output voltage of each other.
【０００８】[0008]
回転体の回転に伴って両磁気検出コイルを貫く磁束が変化すると、両磁気検出 コイルに正弦波状の電圧が誘起されると共に、双安定磁気特性を有する磁性材料 を磁芯とする磁気検出コイル側に急峻なパルス状の電圧が誘起される。このとき 、両磁気検出コイルの出力電圧のうちの正弦波成分は互いに相殺されるため、一 方の磁気検出コイルに誘起された出力電圧のパルス成分のみが取り出される。 When the magnetic flux that penetrates both magnetic detection coils changes as the rotor rotates, a sinusoidal voltage is induced in both magnetic detection coils and the magnetic detection coil side that uses a magnetic material with bistable magnetic characteristics as the magnetic core. A steep pulse-like voltage is induced at. At this time, since the sine wave components of the output voltage of both magnetic detection coils cancel each other out, only the pulse component of the output voltage induced in one magnetic detection coil is extracted.
【０００９】[0009]
【実施例】 次に、本考案の一実施例を図１〜図５に基づいて説明する。[Embodiment] Next, an embodiment of the present invention will be described with reference to FIGS.
【００１０】 図面において、１は、異なる磁極（Ｎ極とＳ極）が周方向に沿って交互に現れ るように多極着磁された磁気リングであり、この磁気リング１は、図示しない回 転体に圧入固定され、それによって回転体の外周に複数の磁束源を配設するよう になっている。また、２は、一対の磁気検出コイル３、４を備えて成る検出器で あり、この検出器２は、両磁気検出コイル３、４の端面を磁気リング１の外周面 に直角に臨ませるように図示しない固定部材に取り付けられている。尚、磁気検 出コイル３、４は、その端面が磁気リング１の軸方向に沿って並列に並ぶように 配置され、両コイル３、４の端面が常時同一磁極に対向するようになっている。In the drawings, reference numeral 1 denotes a magnetic ring magnetized in multiple poles so that different magnetic poles (N poles and S poles) appear alternately along the circumferential direction. It is press-fitted and fixed to the rolling element, so that a plurality of magnetic flux sources are arranged on the outer circumference of the rotating body. Further, 2 is a detector including a pair of magnetic detection coils 3 and 4, and this detector 2 makes the end faces of both magnetic detection coils 3 and 4 face the outer peripheral surface of the magnetic ring 1 at a right angle. Is attached to a fixing member (not shown). The magnetic detection coils 3 and 4 are arranged such that their end faces are arranged in parallel along the axial direction of the magnetic ring 1, and the end faces of both coils 3 and 4 are always opposed to the same magnetic pole. .
【００１１】 検出器２の両磁気検出コイル３、４は、中空ボビン３ａ、４ａに巻回した銅線 ３ｂ、４ｂの外周に絶縁テープ３ｃ、４ｃが巻き付けられ、この絶縁テープ３ｃ 、４ｃの外周に強磁性体製の円筒チューブ３ｄ、４ｄが嵌装される一方で、中空 ボビン３ａ、４ａの内部に磁芯３ｅ、４ｅが挿入された構造となっている。そし て、一方の磁気検出コイル３の磁芯３ｅには双安定磁気特性を有する磁性体が用 いられ、他方の磁気検出コイル４の磁芯４ｅには双安定磁気特性を有しない磁性 体が用いられている。このため、一方の磁気検出コイル３の出力電圧の波形は、 磁気リング１の回転に伴って誘起される正弦波状の波形に大バルクハウゼン効果 による急峻なパルス波形が重畳された波形となり、他方の磁気検出コイル４の出 力電圧の波形はパルス波形の重畳されない正弦波状の波形となる。また、両磁気 検出コイル３、４は、中空ボビン３ａ、４ａに対する銅線３ｂ、４ｂの各巻き数 が同数に設定されると共に、各出力電圧の正弦波成分の位相が１８０°ずれるよ うに銅線３ｂ、４ｂの各端末が結線されている。このため、両磁気検出コイル３ 、４の出力電圧の波形は図４中の実線と破線で夫々示すようになり、これらの出 力電圧の合成波は互いの正弦波成分を相殺し合うものとなる。つまり、磁気検出 コイル３、４の銅線３ｂ、４ｂの端末から最終的に取り出される出力電圧は図５ に示すようなほぼパルス波成分のみの波形となる。In both magnetic detection coils 3 and 4 of the detector 2, insulating tapes 3c and 4c are wound around the outer circumferences of the copper wires 3b and 4b wound around the hollow bobbins 3a and 4a. While the cylindrical tubes 3d, 4d made of a ferromagnetic material are fitted in the hollow core, the magnetic cores 3e, 4e are inserted into the hollow bobbins 3a, 4a. Then, a magnetic substance having bistable magnetic characteristics is used for the magnetic core 3e of the one magnetic detection coil 3, and a magnetic substance having no bistable magnetic characteristic is used for the magnetic core 4e of the other magnetic detection coil 4. It is used. Therefore, the waveform of the output voltage of one magnetic detection coil 3 becomes a waveform in which a steep pulse waveform due to the large Barkhausen effect is superimposed on the sinusoidal waveform induced by the rotation of the magnetic ring 1, and the other. The waveform of the output voltage of the magnetic detection coil 4 is a sinusoidal waveform in which the pulse waveform is not superimposed. In addition, in both magnetic detection coils 3 and 4, the number of turns of the copper wires 3b and 4b with respect to the hollow bobbins 3a and 4a is set to the same number, and the phase of the sine wave component of each output voltage is shifted by 180 °. The terminals of the lines 3b and 4b are connected. Therefore, the waveforms of the output voltages of the two magnetic detection coils 3 and 4 are shown by the solid line and the broken line in FIG. 4, respectively, and the combined wave of these output voltages cancels each other's sine wave components. Become. That is, the output voltage finally extracted from the terminals of the copper wires 3b and 4b of the magnetic detection coils 3 and 4 has a waveform of almost only pulse wave components as shown in FIG.
【００１２】 また、磁気検出コイル３、４の出力端末（上記のように結線された銅線３ｂ、 ４ｂの端末）は図示しない信号処理回路に接続されおり、磁気検出コイル３、４ から出力されたパルスをこの信号処理回路によって矩形波整形した後にカウント し、その結果から回転体の回転数や回転速度を算出するようになっている。Output terminals of the magnetic detection coils 3 and 4 (terminals of the copper wires 3b and 4b connected as described above) are connected to a signal processing circuit (not shown), and output from the magnetic detection coils 3 and 4. The pulse is shaped into a rectangular wave by this signal processing circuit and then counted, and the rotation speed and rotation speed of the rotating body are calculated from the results.
【００１３】 この回転センサは、以上のように両磁気検出コイル３、４の出力電圧の正弦波 成分を互いに相殺し、一方の磁気検出コイル３の出力電圧のうちのパルス成分の みを取り出すようにしているため、回転体に偏心があっても、その偏心による出 力のむらがほとんど生じない。つまり、磁気検出コイル３単体の場合、偏心によ る出力のむらは主に出力電圧の正弦波成分に現れるが、この回転センサの場合、 磁気検出コイル３の出力電圧のパルス成分のみを取り出すようにしているために 、回転体の偏心による影響はほとんど現れない。As described above, this rotation sensor cancels the sine wave components of the output voltage of both magnetic detection coils 3 and 4 and extracts only the pulse component of the output voltage of one magnetic detection coil 3. Therefore, even if the rotating body is eccentric, the output unevenness due to the eccentricity hardly occurs. That is, in the case of the magnetic detection coil 3 alone, the output unevenness due to eccentricity mainly appears in the sine wave component of the output voltage, but in the case of this rotation sensor, only the pulse component of the output voltage of the magnetic detection coil 3 should be extracted. Therefore, the influence of the eccentricity of the rotating body hardly appears.
【００１４】 また、この回転センサにおいては、回転体の速度変化の影響をほとんど受けな いパルス成分のみを取り出すようにしているため、回転体の回転速度が低下して もノイズの影響をさして受けることなく、回転体の回転状態を精度良く検出する ことが出来る。そして、この実施例の回転センサの場合、特に、各磁気検出コイ ル３、４の外周に強磁性体製の円筒チューブ３ｄ、４ｄを設け、この円筒チュー ブ３ｄ、４ｄによって各磁気検出コイル３、４を貫通する磁気リング１の磁束を 効率良く集磁するようにしているため、検出感度も極めて高いものとなっている 。Further, in this rotation sensor, since only the pulse component that is hardly affected by the speed change of the rotating body is extracted, even if the rotating speed of the rotating body is reduced, it is affected by noise. It is possible to detect the rotation state of the rotating body with high accuracy. Further, in the case of the rotation sensor of this embodiment, in particular, the cylindrical tubes 3d and 4d made of a ferromagnetic material are provided on the outer circumferences of the magnetic detection coils 3 and 4, and the magnetic detection coils 3 are formed by the cylindrical tubes 3d and 4d. Since the magnetic flux of the magnetic ring 1 passing through 4 is efficiently collected, the detection sensitivity is also extremely high.
【００１５】 尚、本考案の実施例は以上で説明したものに限るものでなく、例えば、磁性源 を固定部材側に配設して、両磁気検出コイルを回転体側に配設するようにしたも のであっても良い。The embodiment of the present invention is not limited to the one described above. For example, the magnetic source is arranged on the fixed member side, and both magnetic detection coils are arranged on the rotating body side. It may be something.
【００１６】[0016]
以上のように本考案は、双安定磁気特性を有する磁性材料を磁芯とする磁気検 出コイルと、双安定磁気特性を有しない磁性材料を磁芯とする磁気検出コイルと を対にし、両磁気検出コイルを互いの出力電圧の正弦波成分を相殺するように結 線することにより、出力電圧の波形としてパルス成分のみが取り出されるように したため、極めて簡単な構造でありながら、回転体の偏心に起因した出力のむら や、低速回転時におけるノイズの影響をほぼ無くすことが出来る。したがって、 本考案を採用した場合、装置の小型、低コスト化と、検出精度の向上の両立が可 能になる。 As described above, the present invention makes a pair of a magnetic detection coil whose magnetic core is a magnetic material having bistable magnetic characteristics and a magnetic detection coil whose magnetic core is a magnetic material which does not have bistable magnetic characteristics. By connecting the magnetic detection coils so as to cancel out the sine wave components of the output voltage of each other, only the pulse component is extracted as the waveform of the output voltage.Therefore, the eccentricity of the rotating body is extremely simple. It is possible to almost eliminate the influence of the uneven output due to the noise and the influence of noise at low speed rotation. Therefore, when the present invention is adopted, it is possible to reduce the size and cost of the device and improve the detection accuracy.
【図面の簡単な説明】[Brief description of drawings]
【図１】本考案の一実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of the present invention.
【図２】同実施例を示す平面図。FIG. 2 is a plan view showing the same embodiment.
【図３】同実施例を示す側面図。FIG. 3 is a side view showing the same embodiment.
【図４】本考案の回転センサにおける出力電圧の波形を
説明するグラフ。FIG. 4 is a graph illustrating a waveform of an output voltage in the rotation sensor of the present invention.
【図５】本考案の回転センサの出力電圧の波形を示すグ
ラフ。FIG. 5 is a graph showing a waveform of an output voltage of the rotation sensor of the present invention.
１…磁気リング（磁束源）、 ３、４…磁気検出コイル。 1 ... Magnetic ring (flux source) 3, 4 ... Magnetic detection coil.
Claims (1)
を、他方に磁気検出コイルを配設し、磁気検出コイルに
誘起される電圧の変化から回転体の回転を検出するよう
にした回転センサにおいて、双安定磁気特性を有する磁
性材料を磁芯とする磁気検出コイルと、双安定磁気特性
を有しない磁性材料を磁芯とする磁気検出コイルとを対
にし、両磁気検出コイルを互いの出力電圧の正弦波成分
を相殺するように結線したことを特徴とする回転セン
サ。1. A magnetic flux source is provided on one of the rotating body and a fixed member, and a magnetic detection coil is provided on the other side, and rotation of the rotating body is detected from a change in voltage induced in the magnetic detection coil. In a rotation sensor, a magnetic detection coil whose magnetic core is a magnetic material having bistable magnetic characteristics and a magnetic detection coil whose magnetic core is a magnetic material which does not have bistable magnetic characteristics are paired, and both magnetic detection coils are connected to each other. The rotation sensor is connected so as to cancel the sine wave component of the output voltage of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7370892U JPH0637712U (en) | 1992-10-22 | 1992-10-22 | Rotation sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7370892U JPH0637712U (en) | 1992-10-22 | 1992-10-22 | Rotation sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0637712U true JPH0637712U (en) | 1994-05-20 |
Family
ID=13525988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7370892U Pending JPH0637712U (en) | 1992-10-22 | 1992-10-22 | Rotation sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0637712U (en) |
-
1992
- 1992-10-22 JP JP7370892U patent/JPH0637712U/en active Pending
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