SU1253689A1 - Apparatus for controlling electric drive of sheet mill winder - Google Patents

Description

The invention relates to the automation of rolling production, in particular, to devices for automatically adjusting the tension of the strip.

The aim of the invention is to improve the accuracy of the tension control.

The drawing shows a block diagram of a device for controlling the electrochemical winder of a sheet rolling mill.

The device contains a tension setting device 1, the output of which is connected to the first input of the computing unit 2, the output of which is through the regulator

3current connected to the drive

4wheels, including a converter 5 connected in series and a motor 6, the output of the converter 5 through the current sensor 7 is also connected to the input of the current regulator 3, the coil radius determining unit 8, the inputs of which are connected to the outputs of the band speed sensor 9

and a rotational speed sensor 10, and an output to the first input of the block 11 for determining the ratio of the roll radius to the flow excitation, value the motor 6, the second input of which is connected to the output of the flow sensor 12, and the output to the second input of the computing unit 2, the regulator 13 of the excitation flow, which consists single-unit exciter 14 with excitation winding 15 and flow sensor 12, the electromotive force sensor 16, the output of which is connected to the input of the maximum signal selector 17, the output of which is connected to one of the inputs of the excitation flow regulator 13, multiply Spruce 18, one of the inputs of which is connected to the output of the setpoint adjuster 1, another input 7 with the output of the coil radius determination unit 8, and the output with one of the inputs of the adder 19 with limitation, module allocation unit 20, the input of which is connected to the output of the computing unit 2, and the output through the dead zone unit 21 is connected to another input of the adder 19 with a limiter, the output of which is connected to the second input of the regulator 13 of the excitation flow.

The device works as follows.

A signal FJ, proportional to a given amount of tension, is supplied

to the inputs of the computing unit 2 and multiplier 18.

In computing unit 2, the required motor current of the winder is calculated using the formula

R

3

K „(F,

Fa) - --F-.

where Kj, is the engine parameter; R is the roll radius; F is the excitation flow of the engine;

. F - dynamic compensation signal.

The coil radius is determined in block 8 by the ratio of the speed of the strip V and the speed of the coiler and. To calculate the current setpoint, the root is determined by b

The value is in block 1I.

The assembly consisting of the current regulator 3, the converter 5 and the current sensor 7 maintains the set current of the motor 6 of the coiler and, therefore, the set tension.

In factor 18, the product FJ R is calculated, i.e. static torque motor winder. The output signal of the multiplier 18 through the adder 19 is fed to the input of the flow controller 13. Thus, the excitation flow of the motor of the winder varies in proportion to the tension moment; at low tension and the radius of the roll, the excitation flow will be minimal, due to which the magnetic losses in the motor are reduced. The coefficient of proportionality between the output signal of the multiplier J8 and the motor excitation flow can be chosen so that the current of the core corresponds to a certain part of the rated current:

Since the adder 19 is complete with a limitation corresponding to the nominal excitation flow, then at K F.J R 1 the task of the excitation flow will be equal to the nominal value and the device will work as known. When increasing the speed of rotation of the engine 6, the signal from the output of the electromotive force sensor 16 becomes larger than the signal from the output of the flow sensor 12, passes through the selector 7 maximum.

signal and becomes a feedback signal, thereby reducing the excitation flow with increasing engine speed.

In the mode of acceleration and deceleration of the rolling mill, the current reference of the core I is changed by the magnitude of the dynamic current, while the unit 20 selects the current reference module of the cor. If the output signal of block 20 exceeds the value of the dead zone of block 21, then the signal from the output of block 21 is fed to the input of adder 19 and the excitation flow in dynamic modes unegoes, preventing an excessive increase in the current of the core.

The magnitude of the dead zone of block 21 is determined by

Editor M.Kelemes

Compiled by Y. Perederi

Tehred L. Serdyukova Proofreader M.Sharoshi

Order 4663/13 Circulation 518 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

536894

the magnitude of the current core, at which it is advisable to start increasing the excitation flow, the sum signal from the outputs of blocks 18 and 21 is limited in block 19 to the value of the nominal flow. Thus, with a large motor torque, the excitation flow is nominal and the device operates as known with a dependent controlled-flow, with a small torque, the excitation flow is proportional to the motor torque and the current of the core does not decrease below a predetermined value. Due to this reduced magnetic losses in

15, the winder motor reduces the relative error in the calculation of the current set for the core, i.e. accuracy of tension control is increased.

Claims (1)

A DEVICE FOR CONTROLLING THE ELECTRIC DRIVE OF A SHEET-ROLLING WINDER, containing a tension adjuster, the output of which is connected to the first input of the computing unit, the output of which is connected through the current regulator to the winder electric drive, including the converter and motor connected in series, and the converter output through the current sensor is also connected to the input of the current regulator , a unit for determining the radius of the roll, the inputs of which are connected to the outputs of the speed sensor of the ceiling and the speed sensor of the winder, and the output is Single Bloch first input determining the ratio of radius to the PV womb flow motor driving a second input coupled to an output of the flow sensor and an output - to +. the second input of the computing unit, the excitation flow regulator connected through the exciter to the field winding and the flow sensor, an electromotive force sensor whose output is connected to the input of the maximum signal selector, the output of which is connected to one of the inputs of the excitation flow regulator, it consists in that, in order to increase the accuracy of tension control, the device additionally contains a multiplier, one of the inputs of which is connected to the output of the tension adjuster, the other input - with the output of the roll radius determination unit, and the output - with one of the inputs of the adder with restriction, module selection unit whose input is connected to the output of the computing unit, and the output through the deadband unit is connected to another input of the adder with a restriction, the output of which is connected to the second input of the excitation flow controller.