JPH084387B2 - Electric current control device - Google Patents
Electric current control deviceInfo
- Publication number
- JPH084387B2 JPH084387B2 JP62155377A JP15537787A JPH084387B2 JP H084387 B2 JPH084387 B2 JP H084387B2 JP 62155377 A JP62155377 A JP 62155377A JP 15537787 A JP15537787 A JP 15537787A JP H084387 B2 JPH084387 B2 JP H084387B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- control
- speed
- current control
- tension
- 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 - Fee Related
Links
Landscapes
- Control Of Electric Motors In General (AREA)
- Control Of Direct Current Motors (AREA)
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本発明は、抄紙機などを電流制御によって張力制御す
る電動機の電流基準を自動的に設定して円滑に張力制御
に移行させる電動機の電流制御装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention automatically sets a current reference of an electric motor for tension control of a paper machine or the like by current control, and smoothly shifts to tension control. The present invention relates to a current control device for an electric motor.
（従来の技術） 抄紙機においては例えば第３図に示すように、ドライ
ヤロール２とカレンダロール３との間の紙１の張力Ｔを
一定に保つよう運転される。(Prior Art) In a paper machine, as shown in FIG. 3, for example, the tension T of the paper 1 between the dryer roll 2 and the calendar roll 3 is kept constant.
張力Ｔを一定にするためには、例えばペーパーロール
に張力検出器23を取付け、その出力を帰還信号としてカ
レンダロール３を張力制御することが行われる。In order to keep the tension T constant, for example, a tension detector 23 is attached to a paper roll, and the output of the tension detector 23 is used as a feedback signal to control the tension of the calendar roll 3.
張力検出器23の取りつけが困難なときは、電動機電流
を一定に制御する見かけ上の張力制御が広く行われてい
る。これは電動機電流が電動機トルクに比例し、トルク
は張力に比例することを利用したものである。When it is difficult to mount the tension detector 23, apparent tension control for controlling the electric motor current to be constant is widely performed. This utilizes the fact that the electric motor current is proportional to the electric motor torque, and the torque is proportional to the tension.
カレンダロールにおける電流制御は一般に第４図に示
すように、マイナループに速度制御を含む形で行われ
る。この方法は、カレンダロールは紙通し時は速度制御
が行われ、また紙張力の長時間にわたる変動をおさえれ
ばよく速い張力応答の必要がないので有利である。The current control in the calendar roll is generally performed by including a speed control in the minor loop, as shown in FIG. This method is advantageous because the speed of the calender roll is controlled when the paper is threaded, and it is not necessary to provide a fast tension response as long as the fluctuation of the paper tension is suppressed over a long period of time.
紙通し時は電流制御は行わず速度制御のみで運転して
紙通しを完了する。At the time of threading, current control is not performed and only speed control is performed to complete threading.
すなわち所望の運転速度に対応する速度基準Erを速度
設定抵抗器７で設定し、電動機５の回転軸に取付けた速
度検出器６よりの速度帰還信号Enとつき合わせ、その偏
差Er−Enを速度制御ユニット８で増幅し、位相制御ユニ
ット９を介してサイリスタ整流器10のゲートを制御し、
サイリスタ整流器出力電圧Edを変化させて電動機５が所
望の運転速度となるように速度制御する。That is, the speed reference E r corresponding to the desired operating speed is set by the speed setting resistor 7, and matched with the speed feedback signal E n from the speed detector 6 attached to the rotating shaft of the electric motor 5, and its deviation E r − E n is amplified by the speed control unit 8 and the gate of the thyristor rectifier 10 is controlled via the phase control unit 9,
The thyristor rectifier output voltage E d is changed to control the speed of the electric motor 5 to a desired operating speed.
紙通しが終了して紙が全幅になると、所望の張力にな
るように速度設定抵抗器７を再操作し、電動機速度を微
調整する。When the paper has been passed through and the width of the paper has reached the full width, the speed setting resistor 7 is operated again so that the desired tension is obtained, and the motor speed is finely adjusted.
所望の張力が得られると、その時の電流値をサイリス
タ整流器10の一次側に取付けた変流器11および電流変換
器12を通し電流計14に表示する。When the desired tension is obtained, the current value at that time is displayed on the ammeter 14 through the current transformer 11 and the current converter 12 attached to the primary side of the thyristor rectifier 10.
電流計14の指示値を目視して対応する目盛に電流設定
抵抗器13を設定すると、電流設定抵抗器13の出力が電流
基準Irとなり、変流器11および電流変換器12を介して得
られた電動機５の電流帰還信号Inと比較され、その偏差
値In−Irが電流制御ユニット15で増幅される。When the current setting resistor 13 is set on the corresponding scale by visually observing the indicated value of the ammeter 14, the output of the current setting resistor 13 becomes the current reference I r , and it is obtained via the current transformer 11 and the current converter 12. The current feedback signal I n of the electric motor 5 is compared, and the deviation value I n -I r is amplified by the current control unit 15.
さらにその出力信号は現場取付の電流入切用切換スイ
ッチ16を入側に操作してその接点を閉じると、上記速度
制御ループの偏差Er−Enに付加されて速度制御ユニット
８に入力され、位相制御ユニット９を介してサイリスタ
整流器10のゲートを制御し、これによってその出力電圧
が制御される。Further, the output signal is added to the deviation E r -E n of the speed control loop and is input to the speed control unit 8 when the on / off switching switch 16 installed in the field is operated to close the contact. , Controls the gate of the thyristor rectifier 10 via the phase control unit 9, which controls its output voltage.
このように電流制御は速度制御に対する電流補正を行
って電動機電流を制御し、これによって張力Ｔは一定に
制御される。As described above, the current control controls the electric current of the electric motor by performing the current correction for the speed control, so that the tension T is controlled to be constant.
（発明が解決しようとする問題点） しかしながら上述のように操業で一番忙しい通紙時に
電流計14を見ながら電流設定抵抗器13の操作を行うこと
は面倒であり、設定ミスを生ずる恐れがあり、また電流
入切用切換スイッチ16の操作も行う必要があるので操作
ミスによって速度制御をそのまま継続するなどの操業不
良を生ずる恐れがある。(Problems to be Solved by the Invention) However, as described above, it is troublesome to operate the current setting resistor 13 while watching the ammeter 14 at the time of the busiest sheet passing in the operation, and there is a possibility that a setting error may occur. In addition, since it is necessary to operate the current on / off switching switch 16 as well, there is a risk of a malfunction such as continuing speed control due to an operation error.
本発明は速度制御から電流制御への切換えを自動的に
行って通紙時における操作ミスを防ぎ操業の安定化をは
かる電動機の電流制御装置を提供することを目的として
いる。SUMMARY OF THE INVENTION It is an object of the present invention to provide a current control device for an electric motor, which automatically switches from speed control to current control to prevent an operation error during paper feeding and stabilize the operation.
（問題点を解決するための手段と作用） 本発明は、速度制御回路をマイナーループに含み、速
度制御中の電動機を所定の電流基準に対応する電流制御
に切換えて運転する電動機の電流制御において、上記速
度制御中の電動機の電流値を検出して記憶し、この電流
値から電流制御のための電流基準を求めて自動的に設定
する電流基準自動設定回路を備え、前記電流基準の設定
後に自動的に電流制御に切換えるようにしたものであ
る。これによって速度制御から電流制御へ切換えたとき
の電流の急激な変化を防止して安定に適正な電流制御に
移行できるようにしたものである。(Means and Actions for Solving Problems) The present invention relates to a current control of an electric motor which includes a speed control circuit in a minor loop and switches a motor under speed control to a current control corresponding to a predetermined current reference to operate. A current reference automatic setting circuit that detects and stores the current value of the motor during the speed control, obtains a current reference for current control from this current value, and automatically sets the current reference, and sets the current reference after setting the current reference. The current control is automatically switched. This prevents an abrupt change in the current when the speed control is switched to the current control so that the current control can be stably shifted to an appropriate current control.
（実施例） 本発明の一実施例を第１図に示す。第１図は従来の第
４図に比べて、電流制御用の電流設定抵抗器13の代りに
電流基準自動設定回路20が用いられており、他は基本的
に従来の第４図と同じである。(Example) An example of the present invention is shown in FIG. Compared with FIG. 4 of the prior art, FIG. 1 uses an automatic current reference setting circuit 20 instead of the current setting resistor 13 for current control, and basically the same as FIG. is there.
すなわち、まず通紙時は速度設定抵抗器７で設定した
速度基準Erと電動機５の回転軸に取付けた速度検出器６
からの速度帰還信号Enとが等しくなるように速度制御ユ
ニット８および位相制御ユニット９を介してサイリスタ
整流器10のゲートを制御して出力電圧EDを変化させ、電
動機５を速度設定抵抗器７で設定した速度で運転する。That is, first, at the time of paper passing, the speed reference Er set by the speed setting resistor 7 and the speed detector 6 attached to the rotary shaft of the electric motor 5
Speed feedback signal E n and via the speed control unit 8 and the phase control unit 9 so that equal controls the gate of the thyristor rectifier 10 by changing the output voltage E D, the motor 5 the speed setting resistor 7 from Operate at the speed set in.
紙通しが終了し紙がリール４に巻きついて全幅になっ
たことを検出器21が検出すると、その検出接点21A1で限
時リール22を動作させると共に他の検出接点21A2と限時
リール22の限時開接点22Bを通して電流帰還回路を閉成
し、変流器11および電流変換器12を介して電動機電流を
帰還し、アナログ−デイジタル変換器17でデイジタル変
換し、メモリ回路18に記憶する。When the detector 21 detects that the paper has been wound around the reel 4 and the paper has been wound to the full width, the detection contact 21A1 operates the time limit reel 22 and the other detection contacts 21A2 and the time limit open contact of the time limit reel 22. The current feedback circuit is closed through 22B, the motor current is fed back through the current transformer 11 and the current converter 12, digitally converted by the analog-digital converter 17, and stored in the memory circuit 18.
限時リレー22は一定時限T1後に限時開接点22Bを開く
と共に一定時限T2後に限時閉接点22Aを閉じるので、こ
れによってその時の電動機電流がメモリ回路18に記憶さ
れ、この記憶された電流値がデイジタル−アナログ変換
器19を介してアナログ変換され、電流基準Irとなる。Since time limit relay 22 closes the Kiriji closed contact 22A after a certain time period T 2 opens the Kiriji open contact 22B after a predetermined time period T 1, whereby when the motor current is stored in the memory circuit 18 that, this stored current value It is analog-converted through the digital-analog converter 19 and becomes the current reference I r .
この電流基準Irは変流器11と電流変換器12を介して検
出された電動機電流の帰還信号Inと比較され、その変差
Ir−Inが電流制御ユニット15で増幅され、限時閉接点22
Aを通って速度制御ユニット８に入力される。This current reference I r is compared with the feedback signal I n of the motor current detected via the current transformer 11 and the current converter 12, and its difference
I r −I n is amplified by the current control unit 15 and the time-closed contact 22
It is input to the speed control unit 8 through A.
接点21A1,限時開接点22Bおよび限時閉接点22Aの動作
は第４図のタイムチャートに示すように接点21A1動作の
T1後に限時開接点22Bが開路し、T2後に限時閉接点22Aが
閉路するように時限T1,T2をT2＞T1に設定している。The operation of the contact 21A1, the timed open contact 22B and the timed closed contact 22A is the same as the operation of the contact 21A1 as shown in the time chart of FIG.
The time limits T 1 and T 2 are set to T 2 > T 1 so that the timed open contact 22B opens after T 1 and the timed closed contact 22A closes after T 2 .
限時閉接点22Aが閉じることにより、電流制御ユニッ
ト15の出力と速度偏差Er−Enとがつき合わされ、その偏
差が速度制御ユニット８および位相制御ユニット９を介
してサイリスタ整流器10のゲート位相を制御し、その出
力電圧EDを変化させて電動機５の速度を制御する。By closing the time-closed contact 22A, the output of the current control unit 15 and the speed deviation E r −E n are brought into contact with each other, and the deviation causes the gate phase of the thyristor rectifier 10 to pass through the speed control unit 8 and the phase control unit 9. The speed of the electric motor 5 is controlled by controlling the output voltage E D.
これによって電動機電流はメモリ18に記憶された基準
電流Irに一致するように制御され、適正な張力制御が行
われる。As a result, the electric motor current is controlled so as to match the reference current I r stored in the memory 18, and proper tension control is performed.
以上説明したように、本発明によれば、通紙時におけ
る速度制御から最適電流制御への切換えが自動的に行わ
れるので、設定ミスなどによる制御の不安定を防止して
安定な操業を行うことが可能となる。As described above, according to the present invention, switching from speed control to optimum current control during paper passing is automatically performed, so control instability due to setting mistakes and the like is prevented and stable operation is performed. It becomes possible.
第１図は本発明の一実施例を示す系統図、第２図は第１
図における限時リレーの動作タイムチャート、第３図は
本発明が適用される抄紙機の構成を示す図、第４図は従
来の電流制御装置の一例を示す系統図である。 １……紙、２……ドライヤロール ３……カレンダロール、４……リール ５……電動機、６……速度検出器 ７……速度設定抵抗器、８……速度制御ユニット ９……位相制御ユニット 10……サイリスタ整流器、11……変流器 12……電流変換器、13……電流設定抵抗器 14……電流計、15……電流制御ユニット 16……切換スイッチ 17……デイジタル−アナログ変換器 18……メモリ回路 19……アナログ−デイジタル変換器 20……電流基準自動設定回路、21……紙幅検出器 21A1,21A2……検出接点、22……限時リレー 22A,22B……限時接点、23……張力検出器FIG. 1 is a system diagram showing an embodiment of the present invention, and FIG.
FIG. 3 is an operation time chart of the time delay relay in the figure, FIG. 3 is a diagram showing a configuration of a paper machine to which the present invention is applied, and FIG. 4 is a system diagram showing an example of a conventional current control device. 1 ... Paper, 2 ... Dryer roll 3 ... Calendar roll, 4 ... Reel 5 ... Electric motor, 6 ... Speed detector 7 ... Speed setting resistor, 8 ... Speed control unit 9 ... Phase control Unit 10 ... Thyristor rectifier, 11 ... Current transformer 12 ... Current converter, 13 ... Current setting resistor 14 ... Ammeter, 15 ... Current control unit 16 ... Changeover switch 17 ... Digital-analog Converter 18 …… Memory circuit 19 …… Analog-digital converter 20 …… Current reference automatic setting circuit, 21 …… Paper width detector 21A1, 21A2 …… Detection contact, 22 …… Time delay relay 22A, 22B …… Time delay contact , 23 …… Tension detector
Claims (1)
度制御中の電動機を所定の電流基準に対応する電流制御
に切換えて運転する電動機の電流制御において、上記速
度制御中の電動機の電流値を検出して記憶し、この電流
値から電流制御のための電流基準を求めて自動的に設定
する電流基準自動設定回路を備え、前記電流基準の設定
後に自動的に電流制御に切換えることを特徴とする電動
機の電流制御装置。1. A current control of a motor including a speed control circuit in a minor loop, wherein a motor under speed control is switched to a current control corresponding to a predetermined current reference to operate, and a current value of the motor under speed control is changed. A current reference automatic setting circuit for detecting and storing, and automatically setting a current reference for current control from this current value, and automatically switching to current control after setting the current reference. Current control device for electric motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62155377A JPH084387B2 (en) | 1987-06-24 | 1987-06-24 | Electric current control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62155377A JPH084387B2 (en) | 1987-06-24 | 1987-06-24 | Electric current control device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPS641495A JPS641495A (en) | 1989-01-05 |
| JPH011495A JPH011495A (en) | 1989-01-05 |
| JPH084387B2 true JPH084387B2 (en) | 1996-01-17 |
Family
ID=15604609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62155377A Expired - Fee Related JPH084387B2 (en) | 1987-06-24 | 1987-06-24 | Electric current control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH084387B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5217812U (en) * | 1975-07-28 | 1977-02-08 |
-
1987
- 1987-06-24 JP JP62155377A patent/JPH084387B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS641495A (en) | 1989-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |