JPS61175569A - Rotation detector - Google Patents

Rotation detector

Info

Publication number
JPS61175569A
JPS61175569A JP1708985A JP1708985A JPS61175569A JP S61175569 A JPS61175569 A JP S61175569A JP 1708985 A JP1708985 A JP 1708985A JP 1708985 A JP1708985 A JP 1708985A JP S61175569 A JPS61175569 A JP S61175569A
Authority
JP
Japan
Prior art keywords
magnetic flux
magnetic
generating means
flux generating
detection coil
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
Application number
JP1708985A
Other languages
Japanese (ja)
Inventor
Yoshiaki Ida
井田 芳明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1708985A priority Critical patent/JPS61175569A/en
Publication of JPS61175569A publication Critical patent/JPS61175569A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To prevent the lowering of the quantity of light due to oil, dust and the like, by arranging magnetic flux generating means at a specified space from a rotor so that an optical switch is connected to the output of a detection coil provided at the position where the magnetic flux of the generation means interlinks it to form a closed structure of the optical path. CONSTITUTION:A magnetic flux generating means 34 is made up of a permanent magnet 36 and a magnetic body 38 facing a detection gear 30. The magnetic flux of the means 34 interlinks the coil 40 to form a magnetic circuit and as the gear 30 turns, the movement of the gear part 32, the number of magnetic fluxes interlinked with the detection coil 40 changes to induce an AC voltage in the coil 40. The AC output is connected to a limited resistance 46 and a constant voltage diode 48 with leads 44 and 50. Then, a switch 42 is operated with a pulse voltage developing at both ends of the diode 48 and an intermittent signal of light proportional to the rotation of the gear 30 is converted into an electrical signal with a photodetector 64 through a optical connector 58 or the like to detect revolutions with a processing circuit 66. This optical path is so arranged in a closed structure to prevent the lowering of the quantity of light due to oil, dust and the like thereby enabling the maintaining of a highly accurate measurement for a long time.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電動機等の回転体の回転数を検出する回転検
出装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotation detection device for detecting the rotation speed of a rotating body such as an electric motor.

〔従来の技術〕[Conventional technology]

従来の回転検出装置としては、例えば特開昭56−92
461号公報に開示されるものである。
As a conventional rotation detection device, for example, Japanese Patent Application Laid-Open No. 56-92
This is disclosed in Japanese Patent No. 461.

その主要部を第2図に示す。電動機(2)の回転軸(4
)には円盤状の回転体(6)が固着されている。この回
転体(6ンは、所定の半径の円周上に所定の間隔で複数
個の貫通孔(8)を有している。光送受信機αQからの
光は出射光ファイバ(至)を通って、レンズαくで゛ 
集光される。集光された光は、筐体αQの透明窓(至)
を介して回転体(6)に照射される0回転体(6)の回
転によりこの照射もは、透明窓(ホ)、レンズ(2)を
介して断続的に受光ファイバ(財)へ伝達される。した
がって、光送受信器QOは回転体(6)の回転数に比例
した光の断続信号を受信して、回転数を検出することが
できる。
The main parts are shown in Figure 2. Rotating shaft (4) of electric motor (2)
) has a disk-shaped rotating body (6) fixed to it. This rotating body (6) has a plurality of through holes (8) at predetermined intervals on the circumference of a predetermined radius.The light from the optical transceiver αQ passes through the output optical fiber (to). Well, the lens α is large.
The light is focused. The focused light is transmitted through the transparent window of the αQ housing.
Due to the rotation of the zero-rotator (6), this irradiation is intermittently transmitted to the light receiving fiber via the transparent window (e) and lens (2). Ru. Therefore, the optical transceiver QO can receive an intermittent light signal proportional to the rotation speed of the rotating body (6) and detect the rotation speed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来の回転検出装置は、貫通孔(8)を通して光を通過
させているので、貫通孔(8)に油やほこりがっまると
光量が低下して、検出精度が低下するという欠点があっ
た。甚だしい場合には、検出不可能となることもあった
Conventional rotation detection devices pass light through the through hole (8), so if oil or dust gets stuck in the through hole (8), the amount of light decreases and the detection accuracy decreases. . In extreme cases, it could become undetectable.

この発明は、かかる問題点を解決するためになされたも
ので、油やほこり等によって光量の低下を生じない回転
検出装置を提供することを目的とする。
The present invention was made to solve this problem, and an object of the present invention is to provide a rotation detection device that does not cause a reduction in light intensity due to oil, dust, etc.

〔問題点を解決するための手段〕[Means for solving problems]

この発明では、回転体に歯部を設け、歯部を母性体によ
って構成し、回転体と所定の間隔をおいて磁束発生手段
を設け、この磁束発生手段の磁束が鎖交する位置に検出
コイpを設けている。そして、この検出コイルの出力端
に公知の光スィッチを接続した。
In this invention, the rotating body is provided with a toothed portion, the toothed portion is constituted by a mother body, a magnetic flux generating means is provided at a predetermined interval from the rotating body, and a detection coil is placed at a position where the magnetic flux of the magnetic flux generating means interlinks. p is provided. A known optical switch was connected to the output end of this detection coil.

〔作用〕[Effect]

磁束発生手段の磁束は、検出コイルを通って磁気回路を
構成している。検出コイμに鎮交する磁束は、磁束発生
手段に回転体の歯部が対向する場合と、歯と歯の間の谷
部が対向する場合で異なる。
The magnetic flux of the magnetic flux generating means passes through the detection coil to form a magnetic circuit. The magnetic flux that intersects with the detection coil μ differs depending on whether the teeth of the rotating body face the magnetic flux generating means or the valleys between the teeth face the magnetic flux generating means.

したがって、回転体の回転によって、検出コイルに電圧
が誘起されこの電圧で光スィッチが動作される。したが
って光スィッチに入力された光は、回転体の回転数に比
例した光の断続信号として出力される。
Therefore, the rotation of the rotating body induces a voltage in the detection coil, and the optical switch is operated by this voltage. Therefore, the light input to the optical switch is output as an intermittent light signal proportional to the rotation speed of the rotating body.

〔実施例〕〔Example〕

この発明の一実施例を第1図に示す。回転体である検出
歯車(7)は磁性体からなり、歯部(2)が形成されて
いる。磁束発生手段(至)は、永久磁石(至)と磁性体
(至)とからなり、磁性体(至)の先端は、ギャップを
介して検出歯車…に対向している。なお、他の実施例で
は、永久磁石■の代わりに磁束発生コイルを巻回した磁
性体を用いることもできる。磁束と、歯部(至)の移動
によって、検出コイ/L/(mに鎮交する磁束数が変化
する。このため検出コイル(転)に電圧が誘起される。
An embodiment of this invention is shown in FIG. The detection gear (7), which is a rotating body, is made of a magnetic material and has teeth (2) formed therein. The magnetic flux generating means (to) is composed of a permanent magnet (to) and a magnetic body (to), and the tip of the magnetic body (to) faces the detection gear through a gap. In other embodiments, a magnetic body around which a magnetic flux generating coil is wound may be used instead of the permanent magnet (2). Due to the movement of the magnetic flux and the teeth, the number of magnetic fluxes intersecting the detection coil /L/(m changes. Therefore, a voltage is induced in the detection coil.

検出コイ/L’−の出力は、リード線(ロ)輪を介して
、直列に接続されたlE4制限抵抗−9定電圧ダイオー
ドに)に接続されている。したがって、定電圧ダイオー
ド−の両端には一定電圧のパ)vスミ圧が生じ、並列に
接続された光スィッチに)が動作させられる。その結果
、光源−,光コネクター、光ファイバ(財)、光コネク
タ(56)を介して、光スィッチに)に入力された光は
、検出歯車−の回転数に比例した光の断続信号として出
力される。
The output of the detection coil /L'- is connected to a series-connected limiting resistor (1E4) and a constant voltage diode (1E4) through a lead wire (R) loop. Therefore, a constant voltage P/V is generated across the constant voltage diode, causing the optical switch connected in parallel to operate. As a result, the light input to the optical switch via the light source, optical connector, optical fiber, and optical connector (56) is output as an intermittent light signal proportional to the rotation speed of the detection gear. be done.

この光の断続信号を、光コネクタ−、光ファイバー、光
コネクターを介して受光器−で受は電気信号に変換する
。この電気信号を、処理回路−を通してパルス出力とし
、このパルス出力をカウントして回転数を検出する。
This intermittent optical signal is received by an optical receiver via an optical connector, an optical fiber, and an optical connector, and is converted into an electrical signal. This electrical signal is output as a pulse through a processing circuit, and the number of revolutions is detected by counting this pulse output.

なお、上記実施例では、光スィッチに)として、電気光
学効果を利用したものについて説明したが、液晶を用い
た光スィッチを使用することもできる。
In the above embodiments, an optical switch using an electro-optic effect has been described, but an optical switch using liquid crystal may also be used.

液晶による光スィッチを使用する場合には、オン。Turn on when using the LCD light switch.

オフの動作をさせる制御電圧の他、駆動電圧が必要であ
る。この駆動電圧は、検出コイ/I/帥の出力電圧を整
流濾波したものを用いるこめもできる。
In addition to the control voltage for turning off, a driving voltage is required. This driving voltage can also be obtained by rectifying and filtering the output voltage of the detection coil/I/wheel.

液晶による光スィッチを使用すれば、入力された光を反
射させることもできるので、送光、受光用の光ファイバ
を1本にすることが可能となる。
If a liquid crystal optical switch is used, input light can be reflected, so it is possible to use one optical fiber for transmitting and receiving light.

また、容器例を磁性体で構成し、磁束発生手段(財)の
磁束による磁気回路の一部とすることもできる。このよ
うにすれば、磁気回路の抵抗が減って、磁束数が増加し
、その結果、検出コイlv(イ)に誘起される電圧が大
きくなるという効果がある。
Further, the container example can be made of a magnetic material and can be part of a magnetic circuit using the magnetic flux of the magnetic flux generating means. This has the effect that the resistance of the magnetic circuit is reduced, the number of magnetic fluxes is increased, and as a result, the voltage induced in the detection coil lv(a) is increased.

〔発明の効果〕〔Effect of the invention〕

この発明は回転体の回転によって誘起された電圧で、光
スィッチを動作させている。したがって、光路を密閉構
造とすることができ、油やほこり等によって光量が低下
するおそれがない。すなわち精度の高い測定を長期間に
わたって維持することができる。
This invention operates an optical switch using a voltage induced by the rotation of a rotating body. Therefore, the optical path can be made into a sealed structure, and there is no fear that the amount of light will decrease due to oil, dust, etc. In other words, highly accurate measurements can be maintained for a long period of time.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例を示す図、第2図は従来の
回転検出装置を示す図である。 (至)は検出歯車、(ロ)は磁束発生手段、輪は検出コ
イル、に)は光スィッチである。 なお、各図中同一符号は、同一相当部を示す。
FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional rotation detection device. (to) is a detection gear, (b) is a magnetic flux generating means, a ring is a detection coil, and (b) is an optical switch. Note that the same reference numerals in each figure indicate the same corresponding parts.

Claims (6)

【特許請求の範囲】[Claims] (1)被検出回転物に固定され所定の歯数の歯部を有す
る磁性体からなる回転体、 一端が回転体と所定の間隔をもつて対向させられた磁束
発生手段、 磁束発生手段の生じる磁束が鎖交する位置に設けられた
検出コイル、 検出コイルの出力で動作させられる光スイツチ、 を備えたことを特徴とする回転検出装置。
(1) A rotating body fixed to a rotating object to be detected and made of a magnetic material having a predetermined number of teeth, a magnetic flux generating means whose one end faces the rotating body at a predetermined distance, and a magnetic flux generating means generated. A rotation detection device comprising: a detection coil provided at a position where magnetic flux interlinks; and an optical switch operated by the output of the detection coil.
(2)磁束発生手段は、永久磁石を備えたものであるこ
とを特徴とする特許請求の範囲第1項記載の回転検出装
置。
(2) The rotation detecting device according to claim 1, wherein the magnetic flux generating means includes a permanent magnet.
(3)磁束発生手段は、磁性部材に磁束発生コイルを巻
回したものを備えたものであることを特徴とする特許請
求の範囲第1項記載の回転検出装置。
(3) The rotation detecting device according to claim 1, wherein the magnetic flux generating means includes a magnetic member with a magnetic flux generating coil wound around it.
(4)検出コイル,磁束発生手段,光スイツチを収納す
る容器を、磁性体とし、磁束発生手段の磁束によつて形
成される磁気回路の一部を構成するようにしたことを特
徴とする特許請求の範囲第1項ないし第3項のいずれか
1つに記載の回転検出装置。
(4) A patent characterized in that the container housing the detection coil, magnetic flux generating means, and optical switch is made of a magnetic material and constitutes a part of a magnetic circuit formed by the magnetic flux of the magnetic flux generating means. A rotation detection device according to any one of claims 1 to 3.
(5)検出コイルの出力を整流して定電圧化した後、光
スイツチに印加することを特徴とする特許請求の範囲第
1項ないし第4項のいずれか1つに記載の回転検出装置
(5) The rotation detection device according to any one of claims 1 to 4, wherein the output of the detection coil is rectified to make it a constant voltage and then applied to an optical switch.
(6)光スイツチとして液晶を利用したものを使用し、 検出コイルの出力を整流濾波し前記液晶を駆動させる駆
動電圧とし、 検出コイルの出力を整流して定電圧化した後制御電圧と
して光スイツチに印加すること、を特徴とする特許請求
の範囲第1項ないし第5項のいずれか1つに記載の回転
検出装置。
(6) Use a liquid crystal as an optical switch, rectify and filter the output of the detection coil to use as a driving voltage to drive the liquid crystal, rectify the output of the detection coil to make it a constant voltage, and then use the optical switch as a control voltage. The rotation detecting device according to any one of claims 1 to 5, characterized in that the rotation detecting device applies a voltage to the rotation detecting device.
JP1708985A 1985-01-29 1985-01-29 Rotation detector Pending JPS61175569A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1708985A JPS61175569A (en) 1985-01-29 1985-01-29 Rotation detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1708985A JPS61175569A (en) 1985-01-29 1985-01-29 Rotation detector

Publications (1)

Publication Number Publication Date
JPS61175569A true JPS61175569A (en) 1986-08-07

Family

ID=11934257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1708985A Pending JPS61175569A (en) 1985-01-29 1985-01-29 Rotation detector

Country Status (1)

Country Link
JP (1) JPS61175569A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6472074A (en) * 1987-08-12 1989-03-16 Smiths Industries Plc Speed and torque sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6472074A (en) * 1987-08-12 1989-03-16 Smiths Industries Plc Speed and torque sensor

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