JPH02132053A - Winder control device - Google Patents

Abstract

PURPOSE:To suppress a fluctuation in tension during winding to a low value by a method wherein, when an armature current feedback value is lower than a tension current reference value, the armature current feedback value and a change allowable bias value are added to produce a tension current limit value. CONSTITUTION:A speed correction current value rN1 is increased to a value higher than a current limit value rL1 so that a winding reel peripheral velocity V is increased to a line speed+forward speed alpha1 when a material 24 is wound and a load is applied. However, since a current output value rI1 is limited by the current limit val rL1, a current feedback value If is increased to this value. After elapse of a specified period, the increased If and a change allowable bias value rB are added by an adder 23 to produce a tension current limit value rTL and simultaneously produce the current limit value rL1. In this case, If+rB produces rI1 to output it, and If is increased to this value. Since, through repetition of the above motion at intervals of a specified period, rI1 is increased in a staged manner to a tension current reference value rTI, a fluctuation in tension in relation to a line can be suppressed to a low value.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a winding machine control system that performs tension control to wind up a material such as a strip made of various materials such as steel plate, paper, and rubber at a constant tension. It is related to the device.

[Conventional technology]

FIG. 3 is a block diagram showing a winding machine control device used in a conventional steel process line, etc., disclosed in, for example, Japanese Unexamined Patent Publication No. 63-111512.
25 is a reel for winding the material 24; 26 is a motor such as a DC motor that drives the reel 25 so that the material 24 is wound at a line speed V; 27 is a field of the motor 26; can circuit, 1 is a control switching circuit that switches whether or not to perform tension control, 28 and 29 are contacts that are opened and closed by the tension control signal of the control switching circuit 1, 2 is a tension reference calculation circuit that calculates a tension reference value r7, 3
4 is a T/I converter that proportionally converts the tension reference value r7 outputted from the tension reference calculation circuit 2 into a tension current reference value rTI;
5 is a current limit value setting circuit that sets the current limit value rLr based on the tension current reference value rTI or the stronger current value rIs; 5 is a speed reference calculation circuit that calculates the speed reference value rN1; and 6 is a speed detection circuit that detects the speed of the electric motor 26. 7 is the speed detector 6
A speed control circuit 8 outputs a speed correction value rN2 based on the speed feedback value Nf detected by the speed reference calculation circuit 5 and the speed reference value rN1 calculated by the speed reference calculation circuit 5; Convert N/
I converter, 9 is a current limit control circuit that limits the speed correction current value rNI by current limit values rt and r, and outputs a current output value rll; 13 is a thyristor that supplies the current output value rll to the armature of the motor 26; , 10 is a field reference calculation circuit that calculates the field reference value rp, 11 is an F/I converter that proportionally converts the field reference value ry to the field current reference value rFIK, and 12 is a field reference calculation circuit that calculates the field reference value rFI. A field current control circuit 14 that controls the magnetic current value rl2 is a thyristor that supplies the field current value rI2 to the field circuit 27.

Next, operation K [will be explained]. As shown in FIG.
5, but preparations for winding are being made. During this preparation period, speed control is performed to keep the speed of the electric motor 26 constant. When the preparation for winding is completed and the material 24 begins to be wound onto the reel 25, speed control is switched to tension control. Thereafter, the winding is completed and tension control is continued while the material 24 is being wound onto the reel 25, the reel 25 is controlled to have a constant circumferential speed, and the material 24 is being wound at a constant line speed V. .

During speed control, the speed feedback value Nf detected by the speed detector 6 and the speed reference value rN1 calculated by the speed reference calculation circuit 5 are input to the speed control circuit 7, and the speed feedback value N (and The speed correction amount rN2 is adjusted based on the deviation so that the speed reference value rN1 becomes the same value.
seek. This speed correction amount rN2 is proportionally converted into a speed correction current value rNI by the N/I converter 8, and is inputted to the current limit control circuit 9. During this speed control, the tension control signal is not output from control switching circuit 1, so contact 2
8 is open, and contact 29 is closed. As a result, the stronger current value rIs is input to the current limit value setting circuit 4, and this stronger current value rrs is directly outputted as the current limit value rLX and inputted to the current limit control circuit 9. The current limit control circuit 9 sets the speed correction current value rNI to the current limit value rLI.
However, this current limit value rL1 is a stronger current value r
rs, and is set to a value greater than or equal to the maximum value of the speed correction current value rN1, so the speed correction current value rNI is not limited and reaches the current output value r! It is output as 1, passes through the thyristor 13, and is output as an armature current value. As a result, the electric motor 26 is controlled at the speed of the speed reference value rN1.

During tension control, the control switching circuit 1 outputs a tension control signal, which closes the contact 28 and closes the contact 2.
9 is open. Therefore, the tension reference value rT calculated by the tension reference calculation circuit 2 is proportionally converted into the tension current reference value rTI by the T/I converter 3. This tension current reference value rT
1 is inputted to the current limit value setting circuit 4K, and inputted as it is to the current limit control circuit 9 as the current limit value rLI. On the other hand, the speed reference calculation circuit 5 calculates that the circumferential speed V of the reel 25 is at an advanced speed of αl (>0) or α2 (>0) with respect to the line speed V (in order to suppress the tension fluctuation at the start of winding, the winding The speed reference value rN1 is output so that the speed is controlled by switching the advanced speed before and after completion. As a result, the speed feedback value N (and the speed reference value rNl
The speed correction current value rNI is output to the current limit control circuit 9 so that the values are the same. However, during this tension control, since the material 24 on the line is wound up with the reel 25, the line speed V and the reel circumferential speed V are synchronized.
Therefore, the speed control circuit 7 attempts to increase the reel circumferential speed V to [line speed V + advanced speed α1 (or α2)].
Continue increasing the speed correction current value rN1. In response to the ever-increasing speed correction current value rNI, the current limit control circuit 9 limits the current output value rll by the current limit value rLI based on the tension reference value rT. Therefore, during tension control, the current output value rIl is It does not continue to increase and always remains at the tension current reference value rTI. As a result, constant tension control is performed on the material 24 with the tension at the tension reference value r7.

When preparing for winding in FIG. 4, the control switching circuit 1 does not output the tension control signal, and as shown by the dashed line in the figure, the speed control is performed so that [line speed V + advanced speed α1
] Increase the reel circumferential speed V to . Thereafter, a tension control signal is output shortly before the start of winding to set the current limit value rLI to the tension current reference value rTI in preparation for winding the tip of the material 24. When the tip of the material 24 is wound around the reel 25, the reel circumferential speed V becomes equal to the line speed V, and a load is applied. At this time, the speed control circuit 7 attempts to increase the reel circumferential speed V to [line speed V + advanced speed α1 (or α2)], and uses a speed correction value rN2 and a speed correction current value rN.
Increase I all at once. For this reason, the current output value rll shown by the dashed line increases rapidly. After the current output value rI1 reaches the current limit value rLI, the current output value rIL becomes the value of this current limit value rt,I, and constant tension control is performed at the tension of the tension reference value rT.

In field control, a field reference calculation circuit 10 calculates a field reference value rp based on the winding diameter of the reel 250, etc., which is proportionally converted into a field current reference value rF1 by an F/I converter 11K. The field current control circuit 12 sets a field current value rX corresponding to the field current reference value ry1.
2 flows into the field circuit 27 through the thyristor 14. Thereby, the induced voltage is kept constant, and the electric power is controlled to be constant by constant control of the armature current generator (current output value rrx).

Note that FIG. 4 shows a case where an accident such as breakage of the material 24 occurs during tension control. In this case, there is a sudden no-load state, the armature current suddenly drops, and this is fed back as the current feedback value If, so the speed feedback value Nf increases, and as a result, the motor 26 lowers the reel circumferential speed V. The speed control is shifted to [line speed V + advanced speed α2].

[Problem to be solved by the invention]

Since the conventional winding machine control device is configured as described above, when winding the material 24 onto the reel 25, the current output value rrl increases all at once to the tension current reference value rTI, thereby reducing tension fluctuations on the line. There were problems such as the inability to control the amount.

This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a winding machine control device that can suppress fluctuations in tension during winding.

[Means to solve the problem]

The winding machine control device according to the present invention includes a current detector that detects an armature current feedback value, a comparator that compares the detected value with a tension current reference value, and adds the detected value and a change allowable bias value. In addition to providing an adder for
A circuit is provided that sets the sum of the armature current feedback value and the allowable change bias value as the tension current limit value when the armature current feedback value is smaller than the tension current reference value.

[For production]

In the winding machine control device according to the present invention, when the armature current feedback value becomes smaller than the tension current reference value during tension control, the armature current feedback value is the sum of the armature current 7 feed pack value and the change allowable bias value, Since the armature current value is controlled to be limited, it is possible to prevent a rapid increase in current when winding the material, and it is possible to suppress tension fluctuations on the line (material) to a small level.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 to 14 and 24 to 29 are the same as the same reference numerals in FIG. 3, and their explanation will be omitted. 21 is a current detector that detects the armature current feedback value If of the motor;
22 is a comparator that compares the detected armature current feedback value If with the tension current reference value rTI; 23 is a comparator that compares the armature current feedback value I (and the allowable change bias value rB
Adders 30 and 31 are contacts that are opened and closed depending on the comparison result of the comparator 22.

The operation will be briefly explained with reference to FIG. During speed control, the same operation as the conventional control described above is performed.

During tension control, the speed reference calculation circuit 5 calculates the reel circumferential speed V.
is αl(>O) or α2(>O) for line speed V
The speed reference value rN1 is outputted so as to control the speed at the advanced speed of (the advanced speed is switched before and after the completion of K winding in order to suppress the tension fluctuation during winding). As a result, the speed correction current value rNI is output to the current limit control circuit 9 so that the speed feedback value Nf and the speed reference value rN1 become the same value K.

However, after the winding of the material 240 is completed, the material 24 on the line is wound up by the reel 25, so the line speed V and the take-up reel circumferential speed V are synchronized. For this reason, the speed control circuit T adjusts the reel circumferential speed V to [line speed V
The speed correction current value rNI continues to increase in an attempt to increase the speed to the advanced speed α1 (or false). Since the current limit control circuit 9 limits the current output value rll by the current limit value rL in response to the speed correction current value rNI that continues to increase, the current output value r
ll does not continue to increase and is always the tension current limit value r
7L, and constant tension control is performed at this value.

When preparing for winding, the control switching circuit 1 does not output the tension control signal, increases the current limit values rt, r, and increases the current value rI!
3, and as shown by the dashed line in FIG. 2, the reel peripheral speed V is increased to [line speed V + advanced speed α1] by speed control.

When the reel circumferential speed V reaches [line speed V + advanced speed α1], a tension control signal is output from the control switching circuit 1, and the contact 28 is closed and the contact 29 is opened. Therefore, the current limit value rLI becomes the tension current limit value rTL. At this time,
Since the material 24 is not wound around the reel 25 and it is rotating under no load, the current feedback value I{ detected by the current detector 21 is small, and the tension current reference value rT
It is below I. Therefore, if
<rT1 signal is output. This closes the contact 30,
Contact 31 is open. Therefore, the tension current limit value rTt, is determined by the adder 23 as the current feedback value 1 (
and change allowable bias value rB are added together, and this is inputted to the current limit value setting circuit 4 as the tension current limit value rTL via the contact 31, and further as the current limit value rLI.
The signal is input to the current limit control circuit 9 as a signal. At this time, since the speed correction current value rNI and the current feedback value 1 (are smaller than the current limit values rt, r), the reel 25 is not limited to the current limit value rL1, but instead of [line speed V + advanced speed α1] in preparation for winding the tip of the material 24.

When the material 24 is wound and a load is applied, the speed control system attempts to increase the take-up reel circumferential speed V to [line speed V + advanced speed α1] as described above, so the speed correction current value rNr is determined by the current Although the current output value rll is larger than the limit value rLI, the current output value rll is limited to the current limit value rLI. Therefore, the current feedback value If increases to this value. Then, after a certain period, when the increased current feedback value If and change allowable bias value rB are added in the adder 23, this added value becomes the tension current limit value rTL and at the same time becomes the current limit value rLI. At this time as well, the speed correction current value rwx is larger than the current limit value rLI, so [current feedback value If + change allowable bias value r B :})! )” Current output value r
It is output as I1, and the current feedback value 1 (rises to this value).The allowable change bias value r3 and the increased current feedback value 1 (are added at each fixed period), and this added value is expanded. When the operation of increasing the current limit value rTt is repeated, the current output value rI1 reaches the tension current reference value rTx in a stepwise manner as shown in FIG.

By arbitrarily setting this constant cycle time and allowable change bias value rB, the armature current I during winding can be adjusted to the second
As shown by the dashed line in the figure, the tension current can be increased linearly and gently up to the reference value rTI, thereby making it possible to suppress fluctuations in tension to the line (material) to a small level. When the current feedback value If reaches the tension current reference value rTI, the comparator 22 indicates If < rTI
The signal is no longer output, so that contact 3o is opened and contact 31 is closed. Therefore, the tension current reference value r'rr obtained by proportionally converting the tension reference value rT calculated by the tension reference calculation circuit 2 by the T/I converter 3 is the tension current limit value rT.
1 to the current limit value setting circuit 4, and constant tension control is performed at the tension of the tension reference value rT.

Note that the field reference calculation circuit 10, F/I converter 11, field current control circuit 12, and thyristor 14 perform the same operations as the conventional control described above.

In addition, in the above embodiment, the winding machine control was explained using a DC motor, but an AC motor may also be used.
Moreover, it can be widely applied to control of all drive machines that perform tension control.

Further, in the above embodiment, a case was explained in which a band-shaped material 24 was used, but a string-shaped or linear material may also be used, and the same effects as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, by adding an increase limit to the armature current value below the tension current reference value during tension control using the value of [armature current feedback value + change allowable bias value], for example, Since the current limit value is output in a stepwise manner as shown in FIG. 2, it is possible to suppress tension fluctuations during winding of the material, and it is also possible to produce a product with a good winding shape.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a winding machine control device according to an embodiment of the present invention, FIG. 2 is a timing chart explaining the operation of the device, and FIG. 3 is a block diagram showing a conventional winding machine control device. , FIG. 4 is a timing chart explaining the operation of the device. 0 21 is a current detector, 22 is a comparator, 23 is an adder, 24
is the material, 25 is the reel, 26 is the motor, 30.31 is the contact, If is the armature current feedback value, rTI is the tension current reference value, and rB is the allowable change bias value. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant: Mitsubishi Electric Corporation Figure 2 RXS No. 46

Claims (1)

[Claims] A winding machine control device that controls the tension of the material by supplying a current based on a predetermined tension current reference value to an electric motor that drives a reel that winds the material, detects an armature current feedback value of the electric motor. a comparator that compares the detected armature current feedback value with the tension current reference value, and an adder that adds the detected armature current feedback value and a predetermined allowable change bias value. and in the comparator,
A winding machine control device characterized in that, when the armature current feedback value is smaller than the tension current reference value, a current based on the added value of the adder is supplied to the electric motor.