JPH0575664U - Rotation detection sensor - Google Patents
Rotation detection sensorInfo
- Publication number
- JPH0575664U JPH0575664U JP1270892U JP1270892U JPH0575664U JP H0575664 U JPH0575664 U JP H0575664U JP 1270892 U JP1270892 U JP 1270892U JP 1270892 U JP1270892 U JP 1270892U JP H0575664 U JPH0575664 U JP H0575664U
- Authority
- JP
- Japan
- Prior art keywords
- hall element
- hall
- permanent magnet
- detected
- detected portion
- 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.)
- Withdrawn
Links
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
(57)【要約】
【目的】 ホール素子による被検出体の検出電圧を大き
くし、被検出体とホール素子の間の空隙を大きくとれる
ようにした回転検出センサを提供することを目的とす
る。
【構成】 被検出部11に対向して2つのホール素子1
2を配置し、このホール素子12を挟んで被検出部に対
向して永久磁石13を配置する。永久磁石から2つのホ
ール素子の間に強磁性部材14を延在させている。ホー
ル素子で生じた起電力差を差動増幅回路で増幅する。
(57) [Abstract] [Purpose] An object of the present invention is to provide a rotation detection sensor in which the detection voltage of a detected object by a Hall element is increased and a gap between the detected object and the Hall element can be increased. [Structure] Two Hall elements 1 facing the detected part 11
2 is arranged, and the permanent magnet 13 is arranged so as to face the detected portion with the Hall element 12 interposed therebetween. A ferromagnetic member 14 extends from the permanent magnet between the two Hall elements. The electromotive force difference generated in the Hall element is amplified by the differential amplifier circuit.
Description
【0001】[0001]
本考案はホール素子を用いた回転検出センサに関するものである。 The present invention relates to a rotation detecting sensor using a hall element.
【0002】[0002]
図4及び図5は、従来のこの種の回転検出センサを示す断面図である。図4に おいて、1は回転を検出すべき被検出部としての磁性材からなるギヤ形状品、2 はこのギヤ形状品1に対向配置された磁気検出素子としての2素子タイプホール 素子、3はこの2素子タイプホール素子2に隣接し、ギヤ形状品1に対向して配 置され、2素子タイプホール素子2に均等磁場を与える永久磁石、4はこの永久 磁石に近接し、ギヤ形状品1に対向して配置され、永久磁石3の磁束を均等にす るバックアップヨーク、5はこれらの部材を収容するハウジング、6は2素子タ イプホール素子2から信号を取り出すためのプリント配線板である。また、図5 において、7及び8は図3の2素子タイプホール素子に埋設されたホール素子で ある。 4 and 5 are sectional views showing a conventional rotation detecting sensor of this type. In FIG. 4, reference numeral 1 denotes a gear-shaped product made of a magnetic material as a detected part whose rotation is to be detected, 2 denotes a two-element type Hall element as a magnetic detection element arranged facing the gear-shaped product 1, 3 Is a permanent magnet which is adjacent to the two-element type Hall element 2 and is opposed to the gear-shaped product 1 and which gives a uniform magnetic field to the two-element type Hall element 2. 1 is a backup yoke arranged to face 1 to make the magnetic flux of the permanent magnet 3 uniform, 5 is a housing for accommodating these members, and 6 is a printed wiring board for taking out signals from the two-element type hall element 2. .. Further, in FIG. 5, 7 and 8 are Hall elements embedded in the two-element type Hall element of FIG.
【0003】 上記のように構成された従来の回転検出センサにおいては、図4に示したよう に、被検出部としてのギヤ形状品1が2素子タイプホール素子2のホール素子7 ,8の中間に位置しているときは、両ホール素子7,8に発生する起電力はほぼ 等しくなり、図示しない出力段の信号はLレベル又はHレベル状態になる。In the conventional rotation detecting sensor configured as described above, as shown in FIG. 4, the gear-shaped product 1 as the detected portion is the middle of the hall elements 7 and 8 of the two-element type hall element 2. When they are located at, the electromotive forces generated in both Hall elements 7 and 8 become substantially equal, and the signal of the output stage (not shown) becomes L level or H level.
【0004】 一方、図5に示したように、ギヤ形状品1の歯車位置がホール素子7,8の中 間からずれたときは、永久磁石3からの磁束は図の矢印で示したようにホール素 子8に集中する。これにより、両ホール素子7,8のホール起電力に差が生じ、 上記の出力段信号は反転することになる。On the other hand, as shown in FIG. 5, when the gear position of the gear-shaped product 1 deviates from the center of the Hall elements 7 and 8, the magnetic flux from the permanent magnet 3 is as shown by the arrow in the figure. Focus on hall elements 8. As a result, a difference occurs in the Hall electromotive forces of the Hall elements 7 and 8, and the above output stage signal is inverted.
【0005】 以上の動作を繰り返すことによりギヤ形状品1の歯数に比例した信号パルスが 得られる。By repeating the above operation, a signal pulse proportional to the number of teeth of the gear-shaped product 1 is obtained.
【0006】 更に、図6は実開平3−48715号公報に示された同様の従来の回転検出セ ンサの要部を示す断面図である。この従来例では図4の2素子タイプホール素子 2と永久磁石3の間に先端が細くなったヨーク9を介在させ、永久磁石3からの 磁束を2素子タイプホール素子2に集中させ、検出効率の向上を図っている。Further, FIG. 6 is a sectional view showing an essential part of a similar conventional rotation detecting sensor disclosed in Japanese Utility Model Laid-Open No. 3-48715. In this conventional example, a yoke 9 having a thin tip is interposed between the two-element type Hall element 2 and the permanent magnet 3 in FIG. 4 to concentrate the magnetic flux from the permanent magnet 3 on the two-element type Hall element 2. We are trying to improve
【0007】[0007]
しかし、上記従来の回転検出センサでは2つのホール素子の起動力の差から被 検出部の回転を検出するようにしているが、検出感度が低く、従って被検出部と ホール素子の間のギャップを拡大できないという問題点があった。 However, in the conventional rotation detection sensor described above, the rotation of the detected portion is detected based on the difference between the starting forces of the two Hall elements, but the detection sensitivity is low, so the gap between the detected portion and the Hall element is reduced. There was a problem that it could not be expanded.
【0008】 よって本考案は、上述した従来の問題点に鑑み、2つのホール素子の間に強磁 性材を介在させることにより、ホール素子による被検出部の検出電圧を大きくし 、被検出部とホール素子間の空隙を大きくとれる回転検出センサを提供すること を目的としている。Therefore, in view of the above-mentioned conventional problems, the present invention increases the detection voltage of the detected portion by the hall element by interposing a strong magnetic material between the two hall elements, and detects the detected portion. It is an object of the present invention to provide a rotation detection sensor that allows a large air gap between the Hall element and the Hall element.
【0009】[0009]
上記目的を達成するため本考案により成された回転検出センサは、被検出部に 対向して配置された2つのホール素子と、該ホール素子を挟んで前記被検出部に 対向して配置された永久磁石と、該永久磁石から2つのホール素子の間に延在さ せた強磁性部材と、前記ホール素子で生じた起電力差を増幅する差動増幅回路と を備えたことを特徴としている。 In order to achieve the above object, the rotation detecting sensor according to the present invention includes two Hall elements arranged to face the detected portion and the hall element sandwiching the Hall element to face the detected portion. It is characterized by comprising a permanent magnet, a ferromagnetic member extending from the permanent magnet between two Hall elements, and a differential amplifier circuit for amplifying an electromotive force difference generated in the Hall element. ..
【0010】[0010]
上記構成により、ホール素子の間に介在させた強磁性部材は、被検出部とホー ル素子の一方が近接すると、そのホール素子に加わる永久磁石からの磁束をさら に増強させるように作用する。 With the above configuration, the ferromagnetic member interposed between the Hall elements further acts to further enhance the magnetic flux from the permanent magnet applied to the Hall element when one of the detected portion and the hall element approaches.
【0011】[0011]
【実施例】 以下、本考案の実施例を図面に基づいて説明する。図1は本考案による回転検 出センサの一実施例を示す断面図、図2はこの実施例の回路部の構成を示す回路 図である。Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a rotation detection sensor according to the present invention, and FIG. 2 is a circuit diagram showing the configuration of a circuit portion of this embodiment.
【0012】 図1において、11はギヤなどの回転被検出部、12はこの被検出部に対向し て配置された2素子タイプ或いは1素子タイプのホール素子、13は永久磁石、 14は永久磁石13から2つのホール素子12の中間に延設介在され、動作時に 永久磁石13からの磁束を一方のホール素子12に集中させるように作用する強 磁性部材である。In FIG. 1, 11 is a rotation detection target such as a gear, 12 is a 2-element type or 1-element type Hall element arranged facing the detection target, 13 is a permanent magnet, and 14 is a permanent magnet. It is a strong magnetic member extending from 13 between the two Hall elements 12 and acting to concentrate the magnetic flux from the permanent magnet 13 on one Hall element 12 during operation.
【0013】 図2において、12は図1に示したホール素子、15はこれらのホール素子1 2からの起電力を増幅する増幅部、16はこれらの増幅部15からの出力の差を とり増幅する差動増幅部である。In FIG. 2, 12 is the Hall element shown in FIG. 1, 15 is an amplifier for amplifying the electromotive force from these Hall elements 12, and 16 is the difference between the outputs from these amplifiers 15. It is a differential amplifier section.
【0014】 上記のように構成された本実施例は次のように動作する。被検出部11の凸部 がホール素子12の中間に位置しているときはこれらのホール素子12に発生す る起電力はほぼ等しく、図2の差動増幅部16からの出力はL又はHレベルのい ずれかの状態に維持される。The present embodiment configured as described above operates as follows. When the convex portion of the detected portion 11 is located in the middle of the Hall element 12, the electromotive forces generated in these Hall elements 12 are almost equal, and the output from the differential amplifier 16 in FIG. 2 is L or H. Maintained in one of the levels.
【0015】 被検出部11の凸部がホール素子12の中間からずれると、図3に矢印で示し たように永久磁石13からの磁束は図のAで示したホール素子12に集中し、永 久磁石13→Aのホール素子12、強磁性部材14→空隙→被検出部11の磁路 における磁束密度を増加させる。When the convex portion of the detected portion 11 is displaced from the middle of the Hall element 12, the magnetic flux from the permanent magnet 13 is concentrated on the Hall element 12 shown by A in FIG. The magnetic flux density in the permanent magnet 13 → the Hall element 12 of A, the ferromagnetic member 14 → the air gap → the magnetic path of the detected portion 11 is increased.
【0016】 従って、図2の回路部からのホール起電力差は強磁性部材14がない場合に比 べて大きく増強され、回路部の差動増幅部16から出力される。このように本実 施例によれば検出効率は大幅に改善される。Therefore, the Hall electromotive force difference from the circuit section in FIG. 2 is greatly enhanced as compared with the case where the ferromagnetic member 14 is not provided, and is output from the differential amplification section 16 of the circuit section. As described above, according to the present embodiment, the detection efficiency is significantly improved.
【0017】 なお、強磁性部材14の大きさ、高さなどの寸法はホール素子の形状にしたが って決定される。The size and height of the ferromagnetic member 14 are determined according to the shape of the Hall element.
【0018】[0018]
以上説明したように本考案によれば、被検出部に対向配置された2つのホール 素子の間に強磁性部材を永久磁石から延設させることにより、動作時に一方のホ ール素子を通る磁束密度を大幅に増強することができ、したがって回転検出効率 を大幅に向上させることができると共に被検出部とホール素子の間の空隙を拡大 することができる効果がある。 As described above, according to the present invention, by extending the ferromagnetic member from the permanent magnet between the two Hall elements that are arranged to face the detected part, the magnetic flux passing through one of the Hall elements during operation. There is an effect that the density can be greatly increased, therefore the rotation detection efficiency can be greatly improved and the gap between the detected portion and the Hall element can be enlarged.
【図1】本考案による回転検出センサの一実施例を示す
断面図である。FIG. 1 is a sectional view showing an embodiment of a rotation detecting sensor according to the present invention.
【図2】図1の実施例の回路部の構成を示す回路図であ
る。FIG. 2 is a circuit diagram showing a configuration of a circuit section of the embodiment shown in FIG.
【図3】図1の実施例の動作時の磁束の状態を示す断面
図である。FIG. 3 is a sectional view showing a state of magnetic flux during operation of the embodiment of FIG.
【図4】従来の回転検出センサの構成を示す断面図であ
る。FIG. 4 is a cross-sectional view showing a configuration of a conventional rotation detection sensor.
【図5】図4の従来例における磁束の状態を示す断面図
である。5 is a cross-sectional view showing a state of magnetic flux in the conventional example of FIG.
【図6】他の従来例の構成を示す断面図である。FIG. 6 is a cross-sectional view showing the configuration of another conventional example.
11 被検出部 12 ホール素子 13 永久磁石 16 差動増幅部 11 Detected Section 12 Hall Element 13 Permanent Magnet 16 Differential Amplifier Section
Claims (1)
ール素子と、 該ホール素子を挟んで前記被検出部に対向して配置され
た永久磁石と、 該永久磁石から2つのホール素子の間に延在させた強磁
性部材と、 前記ホール素子で生じた起電力差を増幅する差動増幅回
路とを備えたことを特徴とする回転検出センサ。1. A hall element disposed opposite to a detected portion, a permanent magnet disposed opposite to the detected portion with the hall element interposed therebetween, and two hall elements formed from the permanent magnets. A rotation detecting sensor comprising: a ferromagnetic member extending between the two and a differential amplifier circuit for amplifying an electromotive force difference generated in the Hall element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1270892U JPH0575664U (en) | 1992-03-13 | 1992-03-13 | Rotation detection sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1270892U JPH0575664U (en) | 1992-03-13 | 1992-03-13 | Rotation detection sensor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0575664U true JPH0575664U (en) | 1993-10-15 |
Family
ID=11812918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1270892U Withdrawn JPH0575664U (en) | 1992-03-13 | 1992-03-13 | Rotation detection sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0575664U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014126550A (en) * | 2012-12-27 | 2014-07-07 | Denso Corp | Position detector |
-
1992
- 1992-03-13 JP JP1270892U patent/JPH0575664U/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014126550A (en) * | 2012-12-27 | 2014-07-07 | Denso Corp | Position detector |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5493216A (en) | Magnetic position detector | |
JP3618466B2 (en) | Hall effect iron article proximity sensor | |
US6922052B2 (en) | Measuring device for contactless detecting a ferromagnetic object | |
US6928888B2 (en) | Torque sensor for detecting a shaft torque | |
JPH0280913A (en) | Position sensor | |
JP5535139B2 (en) | Proximity sensor | |
US7427859B2 (en) | Moving body detecting apparatus | |
WO1998046968A1 (en) | Magnetic encoder | |
JP3614249B2 (en) | Magnetic moving body sensor | |
JP4697498B2 (en) | Magnetic sensor device | |
JP3666441B2 (en) | Position detection device | |
JPH0575664U (en) | Rotation detection sensor | |
JP2006317336A (en) | Permanent magnet type rotation sensor | |
JP4484033B2 (en) | Moving body detection device | |
US7026809B2 (en) | Magnetic sensor for detecting position and/or speed of a mobile target | |
JPH09292202A (en) | Linear displacement detecting device | |
JPH041877B2 (en) | ||
JP2513851Y2 (en) | Rotation sensor | |
JPH09196701A (en) | Magnetic sensor | |
JPS5919810A (en) | Detecting device of rotation angle | |
JPS617136U (en) | magnetic sensor | |
JPH02263115A (en) | Detector for moving state of moving body | |
JP2727460B2 (en) | Proximity switch magnet | |
JPH10115502A (en) | Sensor for detecting change of magnetic field | |
JP2573745Y2 (en) | Rotation sensor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19960606 |