JPH0769189B2 - Encoder disconnection detection device - Google Patents
Encoder disconnection detection deviceInfo
- Publication number
- JPH0769189B2 JPH0769189B2 JP1118908A JP11890889A JPH0769189B2 JP H0769189 B2 JPH0769189 B2 JP H0769189B2 JP 1118908 A JP1118908 A JP 1118908A JP 11890889 A JP11890889 A JP 11890889A JP H0769189 B2 JPH0769189 B2 JP H0769189B2
- Authority
- JP
- Japan
- Prior art keywords
- disconnection
- encoder
- light
- circuit
- detection device
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Optical Transform (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Control Of Electric Motors In General (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Analogue/Digital Conversion (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はモータの位置検出などに用いられるエンコーダ
の断線検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disconnection detection device for an encoder used for detecting the position of a motor.
従来の技術 この種断線検出装置は、サーボモータで位置決めなどを
行う際にエンコーダ断線時の暴走を防止するものであ
り、第１の従来例としては、例えば特開昭60−117305号
公報で知られているように、パルス信号のパルスの今回
の値と前回の値との比較による偏差値の絶対値を基準値
と比較し、小であれば断線と判断するものである。2. Description of the Related Art This kind of wire breakage detection device prevents runaway at the time of encoder wire breakage when positioning is performed by a servomotor, and a first conventional example is disclosed in, for example, JP-A-60-117305. As described above, the absolute value of the deviation value obtained by comparing the current value and the previous value of the pulse of the pulse signal is compared with the reference value, and if it is small, it is determined that the wire is broken.
第２の従来例としては、例えば特開昭62−84303号公報
で知られているように排他的論理和回路によるものがあ
る。これは、第４図及び第５図に示すように、エンコー
ダから出力され互いに反転させられた二相のパルス信号
号Ａ、の排他的論理和をとり、積分回路によって出力
信号ｘのハザード（ひげ）を除去するものである。As a second conventional example, there is an exclusive OR circuit as disclosed in Japanese Patent Laid-Open No. 62-84303. As shown in FIG. 4 and FIG. 5, this is the exclusive OR of the two-phase pulse signal No. A output from the encoder and inverted from each other, and the hazard (beard) of the output signal x is calculated by the integrating circuit. ) Is removed.
発明が解決しようとする課題 しかし第１の従来例では、停止時に偏差値の絶対値が基
準値よりも小となるため、停止と断線とを区別すること
ができず、停止時の断線検出を行うことができないとい
う問題がある。However, in the first conventional example, since the absolute value of the deviation value becomes smaller than the reference value at the time of stop, it is not possible to distinguish between the stop and the disconnection, and the disconnection detection at the stop is performed. There is a problem that you cannot do it.
これに対して第２の従来例は、両パルス信号Ａ、が入
力されない場合、すなわち二本の入力線が断線した場合
は停止時であっても両者が“HIGH"となり、断線を検出
することはできるが、一方の入力線のパルス信号が“HI
GH"の状態で断線した場合、他方のパルス信号が“LOW"
の状態に維持されるため、断線であることを検出するこ
とができないという問題がある。On the other hand, in the second conventional example, when both pulse signals A are not input, that is, when two input lines are disconnected, both are "HIGH" even when stopped and the disconnection is detected. However, the pulse signal of one input line is "HI
If the wire is disconnected in the "GH" state, the other pulse signal is "LOW".
Since the state is maintained, there is a problem that it is not possible to detect the disconnection.
又第２の従来例は、信号線と電気的に接続しており、信
号線からのノイズを受け易いため、上記積分回路などの
付加回路が必要となり、その分回路構成が複雑になると
いう問題もある。The second conventional example is electrically connected to the signal line and is susceptible to noise from the signal line. Therefore, an additional circuit such as the integrating circuit is required, and the circuit configuration becomes complicated accordingly. There is also.
本発明は上記従来例の問題点に鑑み、動作時及び停止時
いずれの場合でも断線検出ができ、且つ回路構成の簡単
なエンコーダの断線検出装置を提供することを目的とす
る。The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a disconnection detecting device for an encoder, which can detect disconnection in both cases of operation and stop and has a simple circuit configuration.
課題を解決するための手段 本発明は上記目的を達成するため、反転させられた二相
のパルス信号によって交互に発光する二つの発光素子
と、これら発光素子の光を受光する受光素子とを備えた
ことを特徴とする。Means for Solving the Problems To achieve the above object, the present invention includes two light emitting elements that alternately emit light by inverted two-phase pulse signals, and a light receiving element that receives light from these light emitting elements. It is characterized by that.
上記構成において、発光素子を遅延時間の比較的長いも
ので構成すると好適である。In the above structure, it is preferable that the light emitting element is configured to have a relatively long delay time.
作用 上記構成において、断線していない場合、動作時は二つ
の発光素子が交互に発光し、停止時はどちらか一方の発
光素子が発光するので、受光素子はその光を受光する。
二本の入力線が少なくともどちらか一方に断線が生じる
と二つの発光素子は発光しないので、受光素子は前記発
光素子の光を受光せず、動作時及び停止時にかかわらず
断線を検出することができる。Operation In the above configuration, when the wire is not broken, the two light emitting elements alternately emit light during operation and one of the light emitting elements emits light during stop, so that the light receiving element receives the light.
Since the two light emitting elements do not emit light when at least one of the two input lines is broken, the light receiving element does not receive the light of the light emitting element, and the disconnection can be detected during the operation and the stop. it can.
又前記受光素子は本体回路から電気的にアイソレートさ
れており、信号線からのノイズを受けないので、第２従
来例のような積分回路が不要でその分回路構成を簡単に
することができる。Further, since the light receiving element is electrically isolated from the main body circuit and does not receive noise from the signal line, the integrating circuit as in the second conventional example is unnecessary and the circuit configuration can be simplified accordingly. .
実 施 例 本発明の一実施例におけるエンコーダの断線検出装置
を、第１図〜第３図に基いて説明する。Practical Example An encoder disconnection detecting device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
第３図は同断線検出装置Ｄが付設されたモータの制御系
を示し、１はサーボモータ、２は差動伝送方式のエンコ
ーダ、３はカウンタ回路、４は演算制御装置、５はモー
タドライバ回路である。前記エンコーダ２は、第１図に
示すように、相反転させられたＡ、二相のパルス信号
を出力する。尚、本実施例ではエンコーダ２とカウンタ
回路３との間に、光結合回路を用いたインターフェース
回路６を設けてアイソレートしている。FIG. 3 shows a control system of a motor to which the disconnection detecting device D is attached. 1 is a servo motor, 2 is a differential transmission type encoder, 3 is a counter circuit, 4 is an arithmetic and control unit, and 5 is a motor driver circuit. Is. As shown in FIG. 1, the encoder 2 outputs phase-inverted A and two-phase pulse signals. In this embodiment, an interface circuit 6 using an optical coupling circuit is provided between the encoder 2 and the counter circuit 3 for isolation.
第１図に示す同断線検出装置Ｄにおいて、７は第１のLE
D、８は第２のLED2で、入力側に並列に接続されてい
る。第１のLED7は、Ａ相のパルス信号が“HIGH"のとき
発光する。第２のLED8は、相のパルス信号が“HIGH"
のとき発光する。従って両LED7、８は、交互に発光する
結果となる。本実施例ではこれらLED7、８に遅延時間の
比較的長い素子を用いている。９は第１、第２のLED7、
８の光を受光するフォトトランジスタで、出力側に接続
されている。フォトトランジスタ９は前記光を受光しな
いとき、第３図に示す非常停止回路10に出力される断線
信号Xaは“HIGH"となる。In the disconnection detection device D shown in FIG. 1, 7 is a first LE.
D and 8 are the second LEDs 2, which are connected in parallel to the input side. The first LED 7 emits light when the pulse signal of phase A is "HIGH". The second LED 8 has a phase pulse signal of "HIGH"
Lights when. Therefore, both LEDs 7 and 8 emit light alternately. In this embodiment, the LEDs 7 and 8 use elements having a relatively long delay time. 9 is the first and second LEDs 7,
8 is a phototransistor that receives the light of 8 and is connected to the output side. When the phototransistor 9 does not receive the light, the disconnection signal Xa output to the emergency stop circuit 10 shown in FIG. 3 becomes "HIGH".
以上の構成において、エンコーダ２からの信号線に断線
が生じていない場合、第１、第２のLED7、８は前記エン
コーダ２から送られるＡ、二相パルス信号によって交
互に切れ目なく発光し、フォトトランジスタ９はその光
を受光する。この場合、断線信号Xaは“LOW"である。
尚、このときインターフェース回路６からの出力信号ａ
の波形は、Ａ相のパルス信号と合致する。In the above configuration, when there is no disconnection in the signal line from the encoder 2, the first and second LEDs 7, 8 alternately emit light without interruption by the A and two-phase pulse signals sent from the encoder 2. The transistor 9 receives the light. In this case, the disconnection signal Xa is "LOW".
At this time, the output signal a from the interface circuit 6
The waveform of is in agreement with the pulse signal of phase A.
前記信号線に断線が生じた場合、Ａ、二相のパルス信
号は断線発生時刻T1に共に“LOW"となる。これに伴って
両LED7、８は発光しなくなり、フォトトランジシタ９の
断線信号Xaは若干のタイムラグΔＴを置いて“HIGH"と
なり、非常停止回路10に断線の発生したことを知らせ
る。When a disconnection occurs in the signal line, both the A and two-phase pulse signals become “LOW” at the disconnection occurrence time T 1 . Along with this, the LEDs 7 and 8 do not emit light, and the disconnection signal Xa of the phototransistor 9 becomes "HIGH" with a slight time lag ΔT, which notifies the emergency stop circuit 10 that disconnection has occurred.
本発明は上記実施例に示すほか、種々の態様に構成する
ことができ、発光素子や受光素子は公知のものを適宜組
合せて構成することができる。The present invention can be constructed in various modes other than shown in the above embodiments, and the light emitting element and the light receiving element can be constructed by appropriately combining known ones.
発明の効果 本発明によれば、動作時及び停止時いずれの場合でも断
線検出ができ、且つ簡単な回路構成で信号線からのノイ
ズを受けないエンコーダの断線検出装置を提供すること
ができる。EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a disconnection detection device for an encoder, which can detect disconnection during both operation and stop, and which does not receive noise from a signal line with a simple circuit configuration.
第１図は本発明の一実施例におけるエンコーダの断線検
出装置の回路図、第２図は同装置における入力側及び出
力側の波形図、第３図は本実施例におけるアクチュエー
タ制御系の全体構成を示すブロック図、第４図は第２の
従来例におけるエンコーダの断線装置の回路図、第５図
は同従来例における入力側及び出力側の波形図である。 ７……第１のLED、８……第２のLED、９……フォトトラ
ンジスタ。FIG. 1 is a circuit diagram of an encoder disconnection detecting device according to an embodiment of the present invention, FIG. 2 is a waveform diagram of an input side and an output side of the same device, and FIG. 3 is an overall configuration of an actuator control system according to the present embodiment. FIG. 4 is a circuit diagram of an encoder disconnection device in the second conventional example, and FIG. 5 is an input side and output side waveform diagram in the conventional example. 7 ... First LED, 8 ... Second LED, 9 ... Phototransistor.
Claims (2)
交互に発光する二つの発光素子と、これら発光素子の光
を受光する受光素子とを備えたことを特徴とするエンコ
ーダの断線検出装置。1. A disconnection detecting device for an encoder, comprising: two light emitting elements that alternately emit light by inverted two-phase pulse signals; and a light receiving element that receives light from these light emitting elements.
る請求項１記載のエンコーダの断線検出装置。2. The disconnection detection device for an encoder according to claim 1, wherein the light emitting element has a relatively long delay time.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1118908A JPH0769189B2 (en) | 1989-05-12 | 1989-05-12 | Encoder disconnection detection device |
| KR1019900006803A KR900019391A (en) | 1989-05-12 | 1990-05-12 | Disconnection detection device of encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1118908A JPH0769189B2 (en) | 1989-05-12 | 1989-05-12 | Encoder disconnection detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02297018A JPH02297018A (en) | 1990-12-07 |
| JPH0769189B2 true JPH0769189B2 (en) | 1995-07-26 |
Family
ID=14748147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1118908A Expired - Lifetime JPH0769189B2 (en) | 1989-05-12 | 1989-05-12 | Encoder disconnection detection device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0769189B2 (en) |
| KR (1) | KR900019391A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100468467B1 (en) * | 2002-01-12 | 2005-01-27 | 삼성전자주식회사 | Receive line defective wiring checking apparatus |
| JP4640466B2 (en) * | 2008-07-22 | 2011-03-02 | シンフォニアテクノロジー株式会社 | Sensor disconnection detection circuit |
-
1989
- 1989-05-12 JP JP1118908A patent/JPH0769189B2/en not_active Expired - Lifetime
-
1990
- 1990-05-12 KR KR1019900006803A patent/KR900019391A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02297018A (en) | 1990-12-07 |
| KR900019391A (en) | 1990-12-24 |
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