JPH0745066B2 - Tension control device for winder and rewinder - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tension control device for a device used for winding and rewinding a material to be wound such as a strip.

[Prior Art] The tension applied to the strip in a rolling line or the like is set based on the shape, material, line structure, etc., and is controlled so as not to fluctuate with respect to the target tension.

FIG. 5 is a block diagram showing an example of a conventional tension control device. Here, the case of winding a strip is shown, and the tension of the strip on the delivery side of the mill 2 is controlled by controlling the torque of the tension reel 1.

The tension reel 1 is driven by the DC motor (M) 3 of the motor generator (MG). The armature of the DC motor 3 is connected to the armature of the generator (G) 4 that constitutes the MG. A mill motor 5 is used as a drive source for the drive source of the mill 2. A pulse generator 6 is connected to the rotating shaft of the DC motor 3, and similarly the mill motor 5 is connected.
Also connected to the pulse generator 7.

The DC motor 3 has a field coil 8 and the generator 4 has a field coil 9. The control unit of the field coil 9 includes a tension setter 10 for setting a tension, a subtracter 11 for obtaining a deviation between the set value and an output of the armature current detector 14 inserted in the armature circuit, and the subtracter 11. An armature current control unit 12 that controls the armature current based on the output of 11 and an armature current control unit 12
The thyristor device 13 drives the field coil 9 based on the output of

On the other hand, the control unit of the field coil 8 calculates the target field magnetic flux based on the calculation result of the coil diameter calculation circuit 15 that calculates the coil diameter based on the outputs of the pulse generators 6 and 7, and the coil diameter calculation circuit 15. Field calculation circuit 16, a field current calculation circuit 17 for calculating a field current by the output of the field calculation circuit 16, and a deviation between the field current and the field current detection value by the field current calculation circuit 17 Subtractor 18 to be obtained, field current control circuit 1 for controlling the field current based on the output of the subtractor 18
9. A thyristor device 20 for driving the field coil 9 based on the output of the field current control circuit 19 and a field current detector 21 for detecting the field current of the field coil 8.

Further, the control unit of the mill motor 5 obtains a line speed setting device 22 for setting the line speed, a pulse generator 23 for detecting the rotation of the mill motor 5, and a deviation between the output of the pulse generator 23 and the output of the line speed setting device 22. It is composed of a subtractor 24 and a speed control circuit 25 for controlling the mill motor 5 based on the output of the subtractor 24.

Next, the tension control device having the above configuration will be described.

First, the control of the mill motor 5 will be described.

The target speed V _ref is set by rotating the line speed setting volume of the line speed setting device 22 by the operator. The subtracter 24 subtracts the set value V _ref from the actual speed v by the pulse generator 23. Based on this deviation, the speed control circuit 25 performs speed control so that the speed v of the mill motor 5 becomes the target speed V _ref . Next, the field control will be described.

The coil diameter calculation circuit 15 calculates the coil diameter D of the tension reel 1 based on the mandren speed of the pulse generator 6 and the line speed of the pulse generator 7. Based on the calculated coil diameter D, the field calculation circuit
16 calculates the target field φ _ref . The field current calculation circuit 17 calculates the target field current If _ref based on the target field φ _ref . Here, the saturation characteristic of the field φ-field current If is compensated. Then, the subtractor 18 causes the target field current If _ref
And the difference between the field current detection value of the field current detector 21 and the detected value. Based on this deviation, the armature current detector 14 controls the field current of the field coil 8 via the thyristor device 20,
Make the field current If equal to the target field current If _ref .

Further, armature current control will be described.

The tension is set by rotating the tension setting volume of the tension setting device 10 by the operator. The subtracter 11 calculates the deviation between the target armature current Ia _ref and the armature current value Ia of the armature current detector 14 based on this setting. Based on this deviation value, the armature current control unit 12 controls the field current of the field coil 9 via the thyristor device 13. By this control, the terminal voltage of the generator 4 is controlled, and as a result, the armature current Ia becomes equal to the target armature current Ia _ref .

Here, the tension T of the tension reel 1 is expressed by the following equation.

T = K ₁ · Ia · φ / (D / 2) (where K ₁ is a constant and D is the coil diameter). The line speed v is expressed by the following equation.

v = K ₁ · E / φ · D Therefore, the magnetic flux φ is expressed by the following equation when the counter electromotive voltage is E _max .

φ = K ₁ · (E _max / v) · D Here, the control device of FIG. 5 performs control so that φ / D becomes constant.

Next, as a tension control device based on a control principle different from that of the above control device, there is one based on maximum torque reel control.
That is, it includes the following control means.

[Line speed control]

Speed control means is provided to the target speed V _ref, the speed limit value or target speed V _ref is prevented given subtractor.
After that, the line speed control is the same as in Fig. 5.

[Field current control]

 Field current control with the following calculation steps.

The target field magnetic flux φ _ref is calculated based on the deviation between the maximum electromotive force E _max and the electromotive force E.

The target field current If _ref is calculated based on the target field magnetic flux φ _ref .

The deviation between the target field current If _ref and the field current If is calculated.

 After that, the same field current control as in FIG.

[Ararm current control] Based on the electromotive force E and the detected value of the armature current Ia, the field φ
To calculate.

After setting the tension, the field φ and the tension set value T _{ref by}
The target armature current Ia _ref is calculated based on.

Find the deviation between the target armature current Ia _ref and the armature current Ia.

 After that, the same armature current control as in FIG.

By such control, the field current is controlled so that the electromotive force E becomes equal to the maximum electromotive force E _max , and the target armature current Ia
_The armature current is controlled so that _ref is equal to the armature current Ia.

Note that, as for the control device of this type, for example,
There is JP-A-60-199524.

[Problems to be Solved by the Invention] However, in recent years, the types of products have diversified, and coil steel plates have been wound or unwound by randomly connecting thick plates and thin plates by welding, and It is necessary to change the tension (high tension and low tension) each time.

However, in the former tension control device (FIG. 5) described above, the tension cannot be changed because the tension is not taken into consideration. In addition, the latter tension control device can cope with tension changes, but the target armature current
Ia _ref calculation means, field magnetic flux φ calculation means, maximum electromotive force E _max
Since it is necessary to provide means for calculating the deviation between the electromotive force E and the target field magnetic flux φ _ref, means for speed limiting, and the like, the configuration becomes complicated, and there is a disadvantage that the cost is increased in setting.

The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a tension control device for a winding machine and a rewinding machine that can change the tension with a minimum of equipment.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides armature current control means for controlling a field current of a generator based on a deviation between a set value and an armature current detection value, A field magnetic flux command corresponding to the coil diameter is calculated, and based on the deviation between the target field current value calculated according to the field magnetic flux command and the actual field current detected value, the motor directly connected to the generator In a tension control device for a winder and a rewinder equipped with a field current control means for controlling a field current, a coil diameter of the high-tensile steel plate is a predetermined diameter when the high-tensile steel plate is wound / unwound as the field magnetic flux command. In the above, there are two commands, a high tension command for making the field magnetic flux constant, and a low tension command for instructing the field magnetic flux that is proportional to the change in the coil diameter of the constant tension steel plate during winding / rewinding. Magnetism calculation means and one of the two commands that the means has And a command selecting means for selecting in accordance with the required tension.

[Operation] According to the above means, when winding and unwinding with high tension, the field magnetic flux is set to a constant value when the coil diameter is a certain value or more, and the tension in this region increases as the coil diameter increases. Get smaller. On the other hand, in response to the request for constant tension, the field magnetic flux is increased / decreased in proportion to the increase / decrease in coil diameter over the entire area so that the tension maintains a constant value. Therefore, the tension can be increased with only a slight addition to the configuration of the conventional control device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a tension control device for a winder and a rewinder according to the present invention. In the present embodiment, the same parts as those in the conventional example shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. Only different configurations will be described.

In this embodiment, in the line speed control unit, a speed limiting circuit 30 is provided between the line speed setter 22 and the subtractor 24 to prevent the motor from operating beyond the specified power of the motor.
A selection switch 31 for inserting or bypassing the speed limiting circuit 30 into the system is provided. Further, in the field control unit, the field calculation circuit for high tension is arranged in parallel with the field calculation circuit 16.
32 is provided, and a selection switch 33 that switches the field calculation circuit 32 and the field calculation circuit 16 according to the tension mode is provided. The armature current control unit has the same configuration as the conventional one, and there is no additional circuit.

Next, the operation of the embodiment having the above configuration will be described.

In this embodiment, the operator manually switches the selection switch 31 and the selection switch 33 to high tension or low tension according to the tension mode (high tension and low tension).

First, the mill control will be described. When the selection switch 31 is switched to the low tension side, the speed limiting circuit 30 is out of the system, which is exactly the same as the case of FIG.
When the selection switch 31 is set to the high tension side, the speed control circuit 30 is inserted into the system, and the mill speed control in which the maximum line speed is limited is executed.

Next, in the field current control, the field calculation circuit 16 or the field calculation circuit 32 is selected by mode selection. Also in this case, when the low tension is selected, it becomes the same as the conventional one. When high tension is selected, the field calculation circuit 32 with a different inclination of φ / D is used.
At low tension, φ / D is kept constant, while at high tension, φ is kept constant for a coil diameter D above a certain value, and is not increased.

Next, a description will be given based on a specific example by the present inventor.
In FIG. 1, the conventional control and the low tension control according to the present invention have the same conditions, but here, the target tension T _ref at low tension is 16 tons (TON), and the conventional target tension (low The same value for both tension and high tension) 12 tons, the target tension at high tension
T _ref is 20 tons. Also, the coil diameter is 0 to 260 mm
It is _assumed that the line speed will change up to 300 _mpm .

Under such conditions, according to the present invention, the characteristics shown in FIGS. 2, 3, and 4 can be obtained. In the figure, the alternate long and short dash line shows the characteristic under the conventional maximum torque reel control, the solid line shows the characteristic under high tension, and the thin line with a cross indicates the characteristic under low tension.

As shown in FIG. 2, when the tension is low, the tension T is kept constant regardless of the change in the coil diameter D, so that the field current If is gradually increased at a low level. Further, when the tension is high, the tension is reduced according to the coil diameter, so that the field current control is performed at a higher level than when the tension is low. At this time, the armature current Ia is maintained at a constant value both when the tension is low and when the tension is high (conventional control is variable stepwise). Further, the motor electromotive force changes according to the line speed at both low tension and high tension, whereas the conventional control is constant.

By such control, as shown in FIG. 3, the change in the field current was directly proportional to the coil diameter D in the past, but in the low tension mode, after the coil diameter reached 2200 mm, it became a constant value. In the high tension mode, the field current is set to a constant value when the coil diameter is smaller.

The power P of the electric motor is determined by the specifications at the time when the equipment is made (P = T × v), and cannot be increased unless the motor is replaced, and if forced, it will cause burnout. However, like the present invention, by controlling the line speed to be lowered and the field current to be increased, without changing the equipment,
It is possible to perform tension control exceeding the performance of the electric motor.

[Effects of the Invention] As is apparent from the above, according to the present invention, the armature current control means for controlling the field current of the generator based on the deviation between the set value and the armature current detection value, and the coil diameter are supported. The field current of the electric motor directly connected to the generator is calculated based on the deviation between the target field current value calculated according to the field flux command and the actual field current detection value calculated according to the field flux command. In a tension control device for a winder and a rewinder equipped with a field current control means for controlling, when the coil diameter of the high-tensile steel plate is not less than a predetermined diameter when the high-tensile steel plate is wound / unwound as the field magnetic flux command. A field calculation means having two commands, a high tension command for making the magnetic flux constant and a low tension command for instructing a field magnetic flux proportional to a change in the coil diameter of the constant tension steel plate during winding / unwinding. , One of the two commands of the means is set as the required tension Since it is provided with the command selecting means for selecting in accordance therewith, the tension control can be expanded with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a tension control device for a winder and a rewinder according to the present invention, FIG. 2 is a comparative characteristic diagram comparing respective characteristics of the present invention and conventional ones, and FIG. 3 is a coil. FIG. 4 is a characteristic diagram showing the relationship between the diameter and the tension and the field current, FIG. 4 is a characteristic diagram showing the relationship between the tension and the line speed, and FIG. 5 is a configuration of the tension control device for the conventional winder and rewinder. It is a block diagram showing. In the figure. 1: Tension reel 2: Mill, 3: DC motor 4: Generator, 5: Mill motor 6,7: Pulse generator 8, 9: Field coil 10: Tension setting device 11, 18, 24: Subtractor 12: Armature Current control unit 14: Armature current detector 15: Coil diameter calculation circuit 16, 32: Field calculation circuit 17: Field current calculation circuit 19: Field current control circuit 21: Field current detector 22: Line speed setting Unit 25: Speed control circuit 30: Speed limit circuit 31, 33: Selection switch

Claims (1)

[Claims] 1. An armature current control means for controlling a field current of a generator based on a deviation between a set value and an armature current detection value, and a field magnetic flux command corresponding to a coil diameter is calculated to generate the field magnetic flux. A winding provided with field current control means for controlling the field current of the electric motor directly connected to the generator based on the deviation between the target field current value calculated according to the command and the actual field current detection value. In the tension control device for the take-up machine and the rewinding machine, as the field magnetic flux command, a command for high tension that keeps the field magnetic flux constant when the coil diameter is a predetermined diameter or more at the time of winding / rewinding the high-tensile steel plate, and a constant value. Field calculation means having two commands for low tension for instructing a field magnetic flux proportional to a change in coil diameter at the time of winding / unwinding a tension steel plate, and one of the two commands included in the means. Command selection means for selecting according to tension Tension controller of the winding machine and rewinding machine according to claim.