JPH0745065B2 - Winding machine and rewinding machine tension control method and device - Google Patents

Description

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

[Prior Art] Conventionally, a DC motor for a winding machine such as a strip is disclosed in
As shown in Japanese Patent Laid-Open No. 60-199524, the tension of the wound strip is controlled to be constant.

If the tension F of the strip is the torque T of the electric motor, then F = gT / (D / 2) (1) where g: Gear ratio of the reducer between the electric motor and the winder D: Strip The diameter of the coil wound with is torque T: T = KφI (2) where K: constant φ: field magnetic flux I: armature current Also, the counter electromotive voltage E of the motor is E = V-IR ... … (3) = kφN = kφ (v / (πD ・ g)) = k '(φ / D) ・ v …… (4) where N: Motor speed R: Armature resistance k, k': Constant v: Strip winding speed According to the equation (1), if the tension F is constant, the torque may be proportional to the diameter D of the coil, and the torque T is φ according to the equation (2).
If the back electromotive force E is proportional to I and the back winding voltage E is proportional to the strip winding speed v according to the equation (4), the field magnetic flux φ increases in proportion to the coil diameter D. Control is performed with I kept constant to make the field magnetic flux φ proportional to the coil diameter D. In this control method, changes in torque T, tension F, armature current I, field magnetic flux φ, back electromotive force E and winding speed v with respect to an increase in coil diameter D are disclosed in JP-A-59-186862. When referring to (FIG. 1), the broken line in FIG. 1 is obtained. The horizontal axis represents the diameter D of the coil, D _o is the diameter at the start of winding, and D _end is the diameter at the _end of winding. In the prior art, the tension F is constant from the start of winding to the end of winding. Therefore, the torque T can be calculated from the formula (1) by the coil diameter D.
Increases in proportion to the increase of. Field magnetic flux φ is coil diameter D
Since it increases in proportion to, the armature current I becomes constant from the equation (2). The back electromotive force E is normally controlled to be constant near the rated voltage. The ratio of the field magnetic flux φ to the coil diameter D is a constant value because the field magnetic flux φ is proportional to the coil diameter D, and the winding speed is constant according to the equation (4).

On the other hand, as a device of the prior art (Japanese Patent Laid-Open No. 59-186862, FIG. 2), as shown in FIG. 3, the DC motor 1 for driving the winder sets the armature current. Command section
2. It has an armature current control unit 3 and a field magnetic flux control unit 4. The armature current command unit 2 is a potentiometer,
The command value of the armature current I is sent to the armature current control unit 3 so that the tension F becomes constant. In the armature current control unit 3, the armature current I is input as a feedback signal from the current detection resistor 5 to the adder 6, and the automatic current is adjusted so that the difference from the command current value from the armature current command unit 2 is eliminated. The regulator 7 controls the armature current I. Reference numeral 8 is a power supply circuit for supplying armature current.

In the adder 9, the counter electromotive voltage E is calculated by subtracting the product of the armature current I and the armature resistance R from the terminal voltage V of the DC motor 1. The adder 9 further includes an armature current correction unit 1 obtained from the output of the voltage divider 10 which is determined in relation to the winding speed v.
The difference between the output of 7'and the counter electromotive voltage E is calculated, and this is input to the integral amplifier circuit 12 as a signal for speed control.
Reference numeral 11 denotes a circuit such as a tacho-generator for detecting the winding speed of the strip, which gives a signal of the winding speed v to the voltage divider 10. In the field magnetic flux controller 4, an integral amplifier circuit
A signal for controlling the field is given from 12 to the adder 13. The adder 13 detects the current flowing in the field winding 14, takes in the field magnetic flux φ as a feedback signal, amplifies the difference between both inputs, and supplies it to the field current control circuit 15. There is.

In addition to the device for determining the winding speed v while controlling the armature current I and the field magnetic flux φ while keeping the tension of the material to be wound constant, the device according to the above-mentioned conventional technique is not limited to The contact point 16a is for hard materials, the contact point 16b is for intermediate materials, and the contact point 16c is for thin and soft materials.

That is, the technique disclosed in Japanese Patent Laid-Open No. 59-186862 is a device for keeping the tension constant, as is clear from the description on page 2, column 4 of the same publication, in which the counter electromotive voltage E and the winding speed v of the strip are The contact points 16a, 16b, 16c for changing the field current to increase the field magnetic flux φ in order to change the ratio are characterized. Moreover, as a method, in the thick and hard materials, the counter electromotive voltage E is halved and the tension F is doubled to improve the motor efficiency, as compared with the thin and soft materials.

[Problems to be Solved by the Invention] As described above, the tension control method for the winding machine according to the related art uses a method in which the tension F of the strip is controlled to be constant. When the electromotive voltage is reached, the winding speed v is kept constant and the field magnetic flux φ is controlled in proportion to the coil diameter D. Therefore, if the tension F is constant from the equation (1), the torque T is proportional to the diameter D of the coil, and (2)
From the equation, the field magnetic flux φ is proportional to the coil diameter D, so that the armature current I is constant. Normally, when the tension F of the strip is controlled to be constant as described above, the armature current I is much smaller than the rated armature current I _o because of the constant value control before the end of winding. Therefore, in order to increase the processing capacity of the winding machine, even if an attempt is made to increase the winding speed by passing a current through the DC motor at the rated armature current I _o , the tension of the strip is kept constant as in the prior art. It is impossible with the control method.

On the other hand, in the tension control device for the winding machine according to the conventional technique, in order to keep the tension F of the strip constant, as shown in FIG. 3, the armature current command unit 2, the armature current control unit 3, and the field magnetic flux control unit are used. Have four. Japanese Patent Laid-Open No. 59-186862
In the description of the publication, the contacts 16a, 16b, 16c are provided in FIG. 3 to divide the ratio of the counter electromotive voltage E and the winding speed v into three stages, but this is a device configuration that keeps the tension F constant. After the ratio of the counter electromotive voltage E to the winding speed v is set to one of the three steps, the field magnetic flux φ is proportional to the diameter D of the coil in the constant tension control. With the mechanism that simply controls the field magnetic flux φ in proportion to the coil diameter D, the armature current I cannot be increased to the rated armature current I _o to improve the processing capacity of the winder, that is, the winding speed v. There is a problem.

The present invention has been made to solve such a conventional problem, and it is possible to increase the armature current of a DC motor for a winder to a rated armature current, thereby increasing the speed of the winder and the rewinder. It is an object of the present invention to provide a tension control method and device for a winding machine and a rewinding machine, which makes it possible to increase the number of winding machines and the processing capacity of the winding machine and the rewinding machine.

[Means for Solving the Problem] The present invention provides tension control for a winding machine and a rewinding machine in which a back electromotive force of a DC motor that drives a winding machine or a rewinding machine is controlled to be constant at a rated back electromotive force. In the method, the armature current is increased to near the rated armature current to keep the field magnetic flux constant, and the winding speed or rewinding speed of the material to be wound exceeds the rated winding speed or rated rewind speed of the motor. ,
While increasing to the maximum speed of the winding speed or the rewinding speed, the armature current is controlled to be near a constant value after becoming close to the rated armature current, and while making the field magnetic flux proportional to the diameter of the winding target, The winding speed of the material to be wound is a method and apparatus for controlling the maximum speed of the winding speed or the rewinding speed to be constant.

[Operation] According to the present invention, since the armature current can be increased to the vicinity of the rated armature current, the processing capacity can be improved by increasing the speeds of the winder and the rewinder.

[Examples] Hereinafter, description will be given with reference to the drawings.

1 (a) to 1 (f) are characteristic curve diagrams showing the tension control method according to the present invention, in which the horizontal axis represents the coil diameter D and the vertical axis represents the armature current I (FIG. 1 (a)). ), Winding speed v
(Fig. 1 (B)), field magnetic flux φ (Fig. 1 (C)), counter electromotive voltage E (Fig. 1 (D)), tension F (Fig. 1 (E)) and torque T (Fig. 1). Fig. 1 (f)) is shown. The solid line shows the present invention, and the dotted line shows the prior art.

A feature of the tension control method for the winder according to the present invention is that the armature current I is increased to near the rated armature current I _o and is controlled to be constant thereafter, as shown in FIG. The field magnetic flux φ is set to a constant value when the armature current I is increased to the vicinity of the rated armature current I _o , and thereafter is controlled in proportion to the coil diameter D. If the back electromotive force E is controlled to be constant while maintaining the rated back electromotive force E _o , the winding speed v is determined by the formula (4).
In a constant region, the winding speed increases to the maximum winding speed V _over in proportion to the coil diameter D, and in a region where the field magnetic flux φ is proportional to the coil diameter D, the winding speed v increases in the maximum winding speed V _over.
It is constantly controlled.

According to the present invention, the armature current I can flow at the rated armature current I _o , and as a result, the winding speed v increases even when the rated back electromotive force is reached, thus increasing the processing capacity of the winding machine. It is possible to increase.

On the other hand, FIG. 2 shows the tension control device for the winding machine according to the present invention. The armature current command unit 2, the armature current control unit 3 and the armature current control unit 4 for controlling the DC motor 1 are exactly the same as those of the prior art (FIG. 3). The device of the present invention is provided with an armature current correction unit 17 between the armature current command unit 2 and the armature current control unit 3. The armature current correction unit 17 is composed of a signal from the armature current correction coefficient table unit 18 and a multiplier 19, and when the armature current _Ia set by the armature current command unit 2 is reached, increases to near the rated armature current I _o by the armature current correction coefficient table section 18, since that led to the vicinity of the rated armature current I _o is constant.

Further, the strip winding speed control unit 20 uses the field magnetic flux φ, the coil diameter D obtained from the detector 21 regarding the diameter of the coil around which the strip is wound, and the counter electromotive voltage E according to the equation (4). The take-up speed v is calculated, and control is performed so as to eliminate the difference between the value and the actual take-up speed of the strip take-up speed detector 11. The constant counter electromotive voltage control unit 22 determines the counter electromotive voltage E based on the field magnetic flux φ, the winding speed v, and the coil diameter D in the strip winding speed control unit 20 based on the rated counter electromotive voltage. It is controlled to be constant, and a field magnetic flux control unit 4 is given a command value of the field magnetic flux.

In this way, the device of the present invention, by providing the armature current correction unit 17, the field magnetic flux calculation unit, the strip winding speed control unit 20 and the constant back electromotive force constant control unit 22 to the device of the prior art, It is possible to increase the armature current I to the rated armature current I _o while keeping the back electromotive voltage E constant at the rated back electromotive voltage, and to increase the winding speed v to V _over while controlling the field magnetic flux φ. is there.

According to the embodiment of the present invention, if the specifications of the winding machine are: DC motor: 400kW, 440V, 909A Field current: Iφ = 8-40A Rotation speed: N = 400-1600 _rpm When constant tension control is performed, the tension is 3060 kg and the winding speed is 800 m / _min .

In the present invention, it is possible to increase the armature current to the rated armature current with constant torque control, so the tension is 2448 kg.
The winding speed is 1000m / _min , which is 2
It will be possible to increase by 5%, and the processing capacity of the winder will increase by almost 25%.

[Effects of the Invention] As described above, the tension control method and apparatus for the winder and the rewinder according to the present invention can increase the armature current to the rated armature current. As a result, the processing capacity of the winder can be increased.

[Brief description of drawings]

FIG. 1 is a characteristic curve diagram showing a tension control method according to the present invention,
FIG. 2 is a circuit diagram showing an outline of a tension control device according to the present invention, and FIG. 3 is a circuit diagram showing an outline of a conventional tension control device. In the figure. 1: DC motor 2: Armature current command section 3: Armature current control section 4: Field magnetic flux control section 5: Current detection resistors 6, 9, 13: Adder 7: Automatic current regulator 8: Power supply circuit 10 : Voltage divider 11: Tachometer 12: Integral amplifier circuit 14: Field winding 15: Field current control circuit 16: Contact point 17: Armature current correction section 18: Armature current correction coefficient table section 19: Multiplier 20: Strip winding speed control unit 21: Coil diameter detector 22: Constant back electromotive force constant control unit

Claims (2)

[Claims] 1. A tension control method for a winding machine and a rewinding machine, wherein a back electromotive force of a DC motor for driving a winding machine or a rewinding machine is controlled to be constant with a rated back electromotive force. Depending on the motor speed, the winding speed or rewinding speed is changed, and the armature current is increased to near the rated armature current to keep the field magnetic flux constant, while After exceeding the winding speed or the rated rewinding speed and increasing to the maximum speed of the winding speed or the rewinding speed, the armature current is controlled to be near the constant value after it reaches the rated armature current, and the field flux Is proportional to the diameter of the material to be wound, and the winding speed of the material to be wound is controlled so that the maximum speed of the above-mentioned winding speed or rewinding speed is kept constant. Tension control method. 2. A tension control device for a DC electric motor driven winder, comprising an armature current command section for setting an armature current so that the tension is constant, an armature current control section and a field magnetic flux control section. , When instructing the armature current set in the armature current command section, the armature current is increased to near the rated armature current, and is kept constant after reaching the rated armature current. An armature current correction unit having a current correction coefficient table unit and a multiplier is provided between the armature current command unit and the armature current control unit, and the back electromotive force, the diameter of the material to be wound, and the electric machine are provided. The child current correction unit recognizes the starting point where the field magnetic flux increases from a constant value, and in the region where the field magnetic flux is a constant value, the winding speed or rewinding speed is proportional to the diameter of the material being wound. Winding speed exceeding the speed or rated rewinding speed Or a speed control unit that increases the rewind speed to the maximum speed, and further controls the winding speed or the maximum speed of the rewind speed to be constant in a region where the field magnetic flux is proportional to the increase in the diameter of the material to be wound. The command value of the field magnetic flux is sent to the field magnetic flux control section while the back electromotive voltage is controlled to be constant from the winding speed or the rewinding speed obtained from the speed control section, the diameter of the object to be wound, and the field magnetic flux. A tension control device for a winder and a rewinder, comprising a constant back electromotive force control unit.