JPS5812180B2 - Material tension control device in winding and unwinding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material tension control device in a winding and unwinding device for winding or unwinding a material such as a continuous long material at a constant tension.

The tension torque τT required by the reel drive motor to wind up or unwind the material with a constant tension by central drive is expressed by the following equation (1).

τT=IT×Φ=T×D ・・・・・・・・・(
1) However, τ0 is the tension component torque, T is the tension, D is the coil diameter during reel winding and unwinding, ■T is the armature current of the motor (tension component), and Φ is the field magnetic flux (torque) of the motor. coefficient)
are shown respectively.

In the above equation (1), in order to control the tension T to be constant with Φ=constant, ■T∝DXT ・・・・・・・・・・・・・・・・・・・・・We must perform the control shown in (2). No.

If control is performed to make the tension Φ∝D
In order to control to a constant value, it is necessary to perform control that satisfies the relationship: IT∝T (3).

Conventionally, the control method shown by equation (2) has not been widely adopted because it does not require a huge capacity electric motor, and the control method shown by equation (3) has generally been used.

However, in the method of equation (3), the field magnetic flux Φ of the electric motor
If the winding diameter ratio exceeds the allowable change range,
It has the disadvantage that tension control is impossible and stability is poor.

Furthermore, as a specific tension control method, (1) multiple resistors are used to generate armature current references and field current references corresponding to acceleration/deceleration components, mechanical losses, and tension components. A memory rheostat method in which each resistance value is distributed according to each function, and the resistor sliding part is made to slide by one servo motor following the winding diameter of the material coil. (2) The winding diameter of the material coil There is a method in which a static circuit calculates the sum τ of each required torque of the motor according to the field current and the field magnetic flux Φ according to the field current, and supplies τ/Φ to the motor control device as an armature current reference.

However, the method (1) has drawbacks such as poor contact of the resistor, and the method (2) requires complicated calculations, resulting in a complicated circuit configuration.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a control device that can perform stable tension control with a simple circuit configuration.

In order to achieve this object, the material tension control device in the winding and unwinding device according to the present invention is designed to control the field magnetic flux Φ of the electric motor when the coil diameter of the wound material coil is equal to or less than a predetermined intermediate coil diameter Dm. The coil diameter of the material coil is made to follow the change in the coil diameter of the coil, and the coil diameter of the material coil is the intermediate coil diameter 9.
a first control device that controls the field magnetic flux Φ to a constant value when the field magnetic flux Φ is equal to or larger than m; a function generator that outputs a signal proportional to a change in coil diameter when the intermediate coil diameter is 9 m or more; and an armature current of the motor calculated on the assumption that the field magnetic flux Φ changes proportionally over the entire range of the coil diameter. The present invention is characterized by comprising a multiplier that calculates the product of a calculation signal and an output signal of the function generator, and a second control device that causes the armature current of the motor to follow the output signal of the multiplier.

The present invention will be explained below with reference to illustrative embodiments.

FIG. 1 shows the configuration of the winding device and tension control device.

A material 1 is fed by a feed roll 2 whose feeding speed is controlled at a constant rate, and is wound into a coil as shown in 4.

3 is a material running speed detector. When the coil diameter of the material coil 4 changes from the winding core diameter Dmin to the maximum diameter Dmax, the rotation speed n of the reel drive motor 10 = L
/Dmin to n3.

However, L is line speed = L/Dmax degrees, n1 is the rotation speed of the electric motor 10 at Dmin, and n3 is D
This is the motor rotation speed at max.

Now, the field change range of the electric motor 10 is if0≦if≦1f1
(ifo is the field current at n1, if1 is the field current at n2, n1>n2>n3), and if the core diameter at rotational speed n2 is Dm, then Do a kind of Kakukyaku.

For the coil diameter Dm>D≧Dmin (n2<n≦n1), control is performed using the method of equation (3), and Dmax≧D≧D
For a coil diameter of m (n3≦n≦n2), (2)
Controlled by formula method.

In FIG. 1, the signal 21 is multiplied by the reel rotation speed detection signal 24 by the multiplier 18, and the multiplied signal is controlled to be equal to the line speed detection signal 23.

If L is the line speed, n is the rotational speed of the electric motor 10, and D is the coil diameter, then L=n×D holds, so the signal 21
It can be seen that is the coil diameter detection signal.

This coil diameter detection signal 21 is input to the function generator 8.

The function generator 8 outputs a field current reference signal 22 that becomes Φ∝D in the range D less than Dm, and Φ in the range D≧Dm.
outputs a constant field current reference signal 22 such that = constant.

The field current reference signal 22 is input to the field current control device 7.

The field current control device 7 controls the field current if flowing through the field winding 5.
This is a device that controls the field current so that it follows the input field current reference signal 22.

That is, the field current if becomes as shown in FIG. 2a.

The compensation signal generator 20 is configured such that the field magnetic flux Φ is within the entire range of the winding diameter (D
max≧D≧Dmin) and Φ∝D, the adder 17 calculates and outputs the sum signal 26 of the motor required current and mechanical loss current during coil acceleration/deceleration, and the adder 17 outputs the sum signal 26 as the tension setting device 19.
A signal set by , that is, a sum signal 25 of the motor required current reference signal 27 for the tension and the signal 26 is output.

The signal 25 is the sum of the required motor currents when Φ∝D is applied over the entire range of the coil diameter.

The function generator 16 outputs a constant value in a region where the field magnetic flux Φ changes in proportion to the coil diameter (Dmin≦D<Dm), and outputs a constant value in a region where the field magnetic flux Φ is a constant value (Dm≦D
≦Dmax), an output signal 23 proportional to the coil diameter is output.

That is, it becomes as shown in FIG.

Multiplier 15 outputs the product of signal 23 and signal 25 as output signal 24
Output as .

This output signal 24 is inputted to the current armature devices 14, 12 as a current reference for the motor 10, and the motor armature current T is controlled to be equal to this current reference.

Therefore, in the region where Dmin≦D<Dm, the electromagnetic current ■T becomes constant, and the tension T is controlled to be constant according to equation (3).

Further, in the region Dm≦D≦Dmax, ■T is proportional to D, and the tension T is controlled to be constant according to equation (2).

In this way, the tension T of the material is controlled to be constant at a predetermined value.

As mentioned above, these coil diameter D, rotation speed n, field current i
The relationship among f, field magnetic flux Φ, and armature current ■T is as shown in the table.

In the figure, 6 is a field current detector, 9 is an integrator for coil diameter detection, 11 is a motor 1 drive power supply generator, 13 is a motor main circuit current detector, 20 is a compensation signal generator, and 28 is an acceleration/deceleration speed. It is a detector.

As described above, according to the present invention, the winding diameter of the material covers a wide range, and the area where the motor field magnetic flux Φ changes proportionally to the winding diameter and the magnetic flux Φ must be limited to a constant value. When controlling a reel drive motor that has a range in which the current is , the required current of the motor can be calculated by the multiplier, and therefore it is possible to provide a tension control device that is extremely economical and has stable control performance compared to conventional ones.

[Brief explanation of drawings]

Fig. 1 shows one embodiment of the present invention, and is a system diagram showing the configuration of a winding and unwinding device and a tension control device, and Fig. 2a
, b are graphs showing the characteristics of the function generator in the same device. 1... Material, 2... Feed roll,
3... Material traveling speed detector, 4... Material coil, 5... Field winding, 6... Field current detector, 7. ...field current control device, 8.
...Function generator, 9...Integrator for coil diameter detection, 10...Reel drive motor, 11...
... Coil rotation speed detector, 12 ... Motor drive power supply generator, 13 ... Motor main circuit current detector, 14 ... Motor main circuit current control device ,
15... Multiplier, 16... Function generator, 17... Adder, 18... Multiplier for coil surface speed detection, 19... ...Tension setting device, 2
0... Compensation signal generator, 21... Coil diameter signal, 22... Field current reference signal, 28...
...Acceleration/deceleration detector.

Claims (1)

[Scope of Claims] 1. In a material tension control device for a winding/unwinding device having a reel driving electric motor for winding material onto a reel or rewinding material from a reel, an intermediate coil having a coil diameter of a wound material coil has a predetermined coil diameter. Diameter D
m or less, the field magnetic flux Φ of the electric motor is made to follow the change in the coil diameter of the material coil, and when the coil diameter of the material coil is the intermediate coil diameter 0 m or more, the field magnetic flux Φ is controlled to a constant value. a control device; outputting a signal that is constant when the coil diameter of the material coil is equal to or less than the intermediate coil diameter Dm, and proportional to a change in coil diameter when the coil diameter of the material coil is equal to or greater than the intermediate coil diameter; a function generator that calculates the product of the armature current calculation signal of the motor, which is calculated assuming that the field magnetic flux Φ changes proportionally over the entire range of the coil diameter, and the output signal of the function generator; A material tension control device in a winding and rewinding device, comprising: a multiplier; and a second control device that causes the armature current of the motor to follow the output signal of the multiplier.