JPH01273612A - Method and device for controlling tension of winder and rewinder - Google Patents

Abstract

PURPOSE:To increase the speeds of a winder and rewinder and to improve the processing capacity of the winder and rewinder by increasing the armature current of the DC motor for winding machine up to the vicinity of a rated armature current. CONSTITUTION:In case of increasing the armature current I up to the vicinity of a rated armature current I0 while under field magnetic flux, it is taken as a fixed value and controlled in proportion to the diameter D of a coil thereafter. When a counter electromotive pressure E is controlled constant just as a rated counter electromotive pressure E0, a winding speed V is increased up to the max. speed in winding in proportion to the diameter D of a coil in the area where a field magnetic flux phi is constant and the winding speed V is controlled constant just as the max. speed in winding in the area where the field magnetic flux phi is in proportion to the coil diameter D. The armature current I is enabled to pass current by the rated armature current I0, as a result, the winding speed V is increased even if reaching to the rated counter electromotive pressure and the processing capacity of a winder can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tension control method and apparatus for equipment used for winding and unwinding a material to be wound, such as a strip.

[Prior Art] Conventionally, a DC motor for a winding machine for strips, etc., is controlled so that the tension of the strip to be wound is constant, as shown in Japanese Patent Laid-Open Publication No. 199524/1983.

If the tension F of the strip is the torque T of the electric motor, then F=g-T/(D/2), (1) where, g: gear of the reducer between the electric motor and the winder The diameter torque T of the coil wound around the ratio D is T = φI (2) where, K: Constant φ: Field magnetic flux I: Armature current Also, the back electromotive force of the motor E is E=V-I R...(3) ) However, V: motor terminal voltage R: armature resistance, k': constant V, winding speed According to formula (1), if the tension F is constant, the torque can be made proportional to the diameter of the coil. Torque T is determined by equation (2) as φ
・If we make the back electromotive force E proportional to the strip winding speed V using equation (4), the field magnetic flux φ increases in proportion to the diameter of the coil, so the armature current Control is performed to keep I constant and to make the field magnetic flux φ proportional to the diameter of the coil. In this control method, as the diameter of the coil increases, torque T, tension F, armature current I, field magnetic flux φ
, changes in back electromotive force E and winding speed V are described in Japanese Patent Application Laid-Open No. 59-18
When shown with reference to Publication No. 6862 (FIG. 1), the solid line in FIG. 1 is shown. The horizontal axis shows the diameter of the coil, D,
is the diameter at the start of winding, and D06 is the diameter at the end of winding. In the prior art, the tension F is constant from after the start of winding to just before the end of winding. Therefore, the torque T increases in proportion to the increase in the diameter of the coil according to equation (1). Since the field magnetic flux φ increases in proportion to the diameter of the coil, the armature current I is constant from equation (2). The back electromotive voltage E is normally controlled to be constant near the rated voltage. The ratio of the field magnetic flux φ to the diameter of the coil is proportional to the field magnetic flux φ or the diameter of the coil, so it is a constant value, so the winding speed is constant according to equation (4).

On the other hand, in the device of the prior art (Japanese Unexamined Patent Publication No. 59-186862, Fig. 2), as shown in Fig. 3, the DC motor l for driving the winding machine has an armature current that sets the armature current. Command unit 2. Armature current control section 3 and field magnetic flux control section 4
It has The armature current command section 2 is a potentiometer, and sends a command value of the armature current I to the armature current control section 3 so that the tension F becomes constant. Armature current control section 3
Then, the armature current ■ is input from the current detection resistor 5 to the adder 6 as a feedback signal, and the armature current command section 2
Automatic current adjustment so that the difference between the command current value and the command current value is eliminated! j17 controls the TL armature current I.

8 is a power supply circuit for supplying armature current.

Adder 9 subtracts the product of armature current I and armature resistance R from terminal voltage V of DC motor 1 to calculate back electromotive force E. The adder 9 further calculates the difference between the output of the armature current correction section 17' obtained from the output of the voltage divider 10 determined in relation to the winding speed (2) and the back electromotive voltage E, and uses this for speed control. The signal is input to the integral amplifier circuit 12 as a signal for the purpose. Note that 11 is a circuit such as a tacho generator for detecting the winding speed of the strip, and supplies a signal of the winding speed V to the voltage divider 10. In the field magnetic flux control section 4, a signal for field control is given from the planting amplifier circuit 12 to the adder 13. This adder 13 is configured to detect the current flowing in the field winding 14, take in the field magnetic flux φ as a feedback signal, amplify the difference of the re-input, and give it to the field current control circuit 15. There is.

In addition to the devices in the prior art described above, which determine the winding speed V while keeping the tension of the material to be wound constant and controlling the armature current I and the field magnetic flux φ, thing·
Contact point 16a for hard material.

Contact 16b for intermediate materials and contact 1 for thin/soft materials
6c is provided.

That is, the technology described in JP-A-59-186862 is a device that keeps the tension constant, as is clear from the description on page 2, column 4, of the same publication, and is based on the back electromotive force E and the strip winding speed V. The characteristics of the contacts 16a, 16b, and 16c change the field current in order to increase the field magnetic flux φ in order to change the ratio. Furthermore, the method focuses on increasing the motor efficiency by making the back electromotive force E more localized and doubling the tension F for thick and hard materials than for thin and soft materials.

[Problems to be Solved by the Invention] As described above, the tension control method of the winding machine according to the prior art uses a method of controlling the strip tension F by keeping it constant, so that the back electromotive force E is lower than the rated reverse voltage. 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 diameter of the coil. Therefore, from equation (1), if tension F is constant, torque T is proportional to the diameter of the coil, and from equation (2), field magnetic flux φ is proportional to the diameter of the coil, so armature current ■ is constant. . Normally, when the strip tension F is controlled to be constant as described above, the armature current I is controlled at a constant value until the end of winding, so the rated armature current ■. considerably smaller than Therefore, even if an attempt is made to increase the winding speed by applying a current to the DC motor with the rated electric preload R, to increase the throughput of the winding machine, the strip tension is kept constant as in the prior art. This is not possible using a method of controlling the

On the other hand, in the conventional tension control device for a winding machine, in order to keep the tension F of the strip constant, an armature current command unit 2. It has an armature current control section 3 and a field magnetic flux control section 4. JP-A-59-1, which is a conventional technology
In the description of the 86862 publication, in Fig. 3, the contacts 16a, 1
6b and 16c are provided to divide the ratio between the back electromotive force E and the winding speed V into three stages, or because the device is configured to keep the tension F constant, the ratio between the back electromotive force E and the winding speed V After determining one of the three stages, the field magnetic flux φ is proportional to the diameter of the coil under constant tension control. In a mechanism in which the field magnetic flux φ is simply controlled proportionally to the diameter of the coil, the armature current I is equal to the rated armature current I. There is a problem in that it is not possible to increase the throughput of the winding machine, that is, the winding speed (2).

The present invention has been made to solve such conventional problems, and by making it possible to increase the armature current of the DC motor for the winding machine to the rated armature current, It is an object of the present invention to provide a tension control method and device for a winder and an unwinder that can increase the speed and improve the throughput of the winder and unwinder.

[Means for Solving the Problems] The present invention provides tension control for a winding machine and an unwinding machine in which the back electromotive voltage of a DC motor that drives the winding machine or unwinding machine is controlled to be constant at a rated back electromotive voltage. In this method, the armature current is increased to near the rated armature current and the field magnetic flux is kept constant, while the winding speed or unwinding speed of the material to be wound exceeds the rated winding speed or rated unwinding speed of the motor. ,
The winding speed or unwinding speed is increased to the maximum speed, and the armature current is controlled near a constant value after it reaches the rated armature current, and the field magnetic flux is made proportional to the diameter of the material to be wound. The winding speed of the object to be wound is a method and apparatus for controlling the maximum winding speed or unwinding speed mentioned above to be constant.

[Function] According to the present invention, the armature current can be increased to near the rated armature current, and the processing capacity can be improved by increasing the speed of the winding machine and the unwinding machine. can.

[Example] The description will be given below based on the drawings.

FIGS. 1(A) to 1(F) are characteristic curve diagrams showing the tension control method according to the present invention, where the horizontal axis shows the diameter of the coil, and the vertical axis shows the armature current I (FIG. 1(A)). )9 Winding speed V(
Fig. 1 (b)), field magnetic flux φ (Fig. 1 (c)), and back electromotive force E (Fig. 1 (d)).

Tension F (Figure 1 (E)) and torque T (Figure 1 (E))
shows. Note that the solid line indicates the present invention, and the dotted line indicates the prior art.

The feature of the tension control method for a winding machine according to the present invention is that the armature current I is set to the rated armature current I, as shown in FIG. The point is to increase it until it reaches a certain point, and then control it to be constant thereafter. The field magnetic flux φ is the armature current I as the rated armature current I. When increasing to the vicinity, it is set to a constant value, and thereafter it is controlled in proportion to the diameter of the coil. The back electromotive voltage E is the rated back electromotive voltage E. If the winding speed V is controlled to be constant as it is, according to equation (4), in a region where the field magnetic flux φ is constant, the winding speed V becomes the maximum winding speed V in proportion to the diameter of the coil. In the region where the field magnetic flux φ is proportional to the diameter of the coil, the winding speed V is the maximum winding speed V. It is controlled to remain constant at V□.

According to the present invention, the armature current I can be made to flow at the rated armature current 1, and as a result, the winding speed V increases even when the rated back electromotive force is reached, increasing the throughput of the winding machine. Is it possible to increase it?

On the other hand, a tension control device for a winder according to the present invention is shown in FIG. Armature current command section that controls the DC electric motor @l. The armature current control section 3 and the TL armature current control section are exactly the same as those of the prior art (the one in FIG. 3). The device of the present invention includes an armature current correction section 17 between the armature current command section 2 and the armature current control section 3. This armature current correction section 17 is composed of a signal from an armature current correction coefficient Cheatzle section 18 and a multiplier 19, and is composed of a signal from an armature current correction coefficient section 18 and a multiplier 19. When the armature current reaches the rated armature current IO, the armature current is increased by the armature current correction coefficient table section 18 to the vicinity of the rated armature current I0, and is kept constant after reaching the rated armature current IO.

The strip winding speed control section 20 also has a detector 21 that measures the field magnetic flux φ and the diameter of the coil wound around the strip.
From the diameter of the coil obtained from and the back electromotive force E, (4)
The strip winding speed V is calculated using the formula, and control is performed so as to eliminate the difference between the calculated value and the actual winding speed detected by the strip winding speed. The back electromotive force constant control unit 22 keeps the back electromotive force E constant at the rated back electromotive voltage based on the field magnetic flux φ9 winding speed ■ in the strip winding speed control unit 20 and the diameter of the coil. and gives a field magnetic flux command value to the field magnetic flux control section 4.

In this way, the device of the invention differs from the prior art devices in the armature current correction section 17. By providing the field magnetic flux calculation section, the strip winding speed control section 20, and the back electromotive force constant control section 22, the armature current I is maintained at the rated armature current I while keeping the back electromotive force E constant at the rated back electromotive voltage. Then increase the winding speed V while controlling the field magnetic flux φ.
It is possible to increase it up to r.

According to the embodiment of this invention, the winding machine specifications or DC motor: 400KW, 440V, 909A field current:
Iφ=8~40A Rotation speed: N=400~1600. p.

If the tension is constant as in the prior art, the tension will be 3060 kg and the winding speed will be 800 m8.n.

With the present invention, it is possible to perform constant torque control and increase the armature current to the rated armature current, so the tension is 2448.
g, and the winding speed is looOm8. Therefore, it is possible to increase the winding capacity by 25% compared to the conventional technology, and the throughput of the winding machine can also be increased by approximately 25%.

[Effects of the Invention] As explained above, the tension control method and device for a winding machine and an unwinding machine of the present invention can increase the armature current up to the rated armature current, so that the tension control method and device of the present invention can increase the armature current up to the rated armature current. This has the effect of increasing the throughput of the winding machine.

[Brief explanation of the drawing]

FIG. 1 is a characteristic curve diagram showing the tension control method according to the present invention;
FIG. 2 is a circuit diagram schematically showing a tension control device according to the present invention, and FIG. 3 is a circuit diagram schematically showing a tension control device of the prior art. In the figure. ■, DC motor 2: Armature current command section 3: Armature current control section 4: Field magnetic flux control section 5: 'Resistor for current detection 6, 9.13: Adder 7: Automatic current regulator 8: Power supply Circuit 10: Voltage divider 11: Tacho generator 12: Integral amplifier circuit 14: Field winding 15: Field current control circuit 16: Contact 17: Armature-71u flow correction section 18: Armature current correction coefficient table section 19: Multiplier 20 Strip winding speed control section 21: Coil diameter detector 22: Back electromotive force constant control section Agent Patent attorney 1) Haru Kitatake Figure 1 Figure 2 Figure 3 July 29, 1988

Claims (2)

[Claims] (1) In a winder and unwinder tension control method in which the back electromotive force of the DC motor that drives the winder or unwinder is controlled to be constant at the rated back electromotive voltage, the armature current is The winding speed or unwinding speed of the material to be wound exceeds the rated winding speed or rated unwinding speed of the motor, and the maximum winding speed or unwinding speed is reached while the field magnetic flux is kept constant. After the armature current reaches the rated armature current, it is controlled near a constant value, and the field magnetic flux is made proportional to the diameter of the material to be wound.
A tension control method for a winder and an unwinder, characterized in that the winding speed of an object to be wound is controlled to be constant at the maximum speed of the winding speed or unwinding speed. (2) In the tension control device for a winding machine driven by a DC motor, the tension control device includes an armature current command section, an armature current control section, and a field magnetic flux control section that set the armature current so that the tension is constant. When commanding the armature current set in the armature current command section, armature current correction is performed such that the armature current is increased to near the rated armature current and remains constant after reaching the rated armature current. An armature current correction section having a coefficient table section and a multiplier is provided between the armature current command section and the armature current control section, and the armature current correction section has a coefficient table section and a multiplier. The 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 constant, the winding speed or unwinding speed is adjusted to the rated winding speed or Increase the winding speed beyond the rated unwinding speed or the maximum rewinding speed,
Furthermore, in a region where the field magnetic flux is proportional to the increase in the diameter of the material to be wound, a speed control section that controls the maximum winding speed or unwinding speed to be constant, and a winding speed or winding speed obtained from the speed control section are provided. It is characterized by comprising a back electromotive voltage constant control section that sends a field magnetic flux command value to a field magnetic flux control section while controlling the back electromotive force to a constant value based on the return speed, the diameter of the material to be wound, and the field magnetic flux. Tension control device for winding and unwinding machines.