SU1737688A1 - Electric motor drive for axial winding - Google Patents

Abstract

Usage: in electric winding - unwinding. Essence: this technical solution allows to calculate the roll radius indirectly, which does not require cumbersome radius calculation schemes, and also allows you to memorize the radius at the moment of breakage or the radius of the original roll, which makes it possible to increase the productivity of the rewinder. 1 il.

Description

The invention relates to electrical engineering and may find application in the field of control of a winding-unwinding drive.

A winding device is known, comprising a master and a speed controller, a sensor and a current controller of a winding motor, a thyristor converter, a measuring generator, two multipliers, a master radius master, a master radius master, a tension master, an integrator and an adder, and the motor is measured through the sensor current is connected to the output of the transformer converter, the input of which is connected to the output of the current regulator, connected to the current sensor via the first input, and connected to the output of the speed regulator via the second input The output of the measuring generator, installed on the axis of the electric motor, is connected to the first input of the first multiplier, whose output is connected to the first inputs of the integrator and the speed controller, to the second input of the integrator the signal of the actual linear speed of the main drive is fed, the output of the integrator is connected to the first input of the adder, the second input of the initial radius connected to the sensor, and the output from the second input of the first multiplier and the first input of the second multiplier, the second input of which is connected to the tension adjuster And an output - to a second input of the speed regulator of the torus, and the third input of which is connected to the speed reference.

A disadvantage of this device is the low accuracy of the tension control, the absence of a radius memory node at the moment of breakage, and low reliability due to the presence of a mechanical sensor.

The closest to the invention in its technical nature is an axially-winding electric drive comprising a setpoint adjuster and tension controller, a current sensor and a current controller of the coil electric motor and a thyristor converter, while the setpoint adjuster is connected to the first one.

WITH

VI

with VI about

00 00

For the tension controller, the winding motor measles is connected via a current sensor to the output of a thyristor converter, the input of which is connected to the output of the current regulator, via the first input connected to the current sensor.

In this electric drive, the output of the measuring generator, installed on the axis of the winding motor, is connected to the second input of the tension controller, the output of which is connected to the second input of the electric current controller.

Tension regulation is performed indirectly according to the principle of maintaining the constancy of power on the winding motor shaft during the winding process:

R M BS 1 -Se (0 F-V.

where P and M are respectively the power and torque on the motor shaft:

o) - angular roll speed, 1 / s;

- current of electric motor core, A;

Ce - const at a constant flow of excitation of an electric motor, Vc;

F - web tension, N.

Linear rewinding speed must be maintained:

V const Uzad.

In the prototype, to maintain a constant tension, the product w is kept constant. For this purpose, a measuring generator (IG) is used, the excitation current of which varies depending on the core current (Φ).

The disadvantage of this technical solution is the low accuracy of the power measurement due to the non-linear relationship between the core current and the EMF of the measuring generator, low reliability due to the presence of a mechanical sensor, low speed due to the presence of inductance (excitation winding IG) in the control circuit. In addition, when the web breaks, the device does not remember the current (radius) at the moment of the break, which does not allow introducing a radial correction in the acceleration and deceleration modes.

The aim of the invention is to increase the accuracy of tension maintenance by increasing reliability, expanding functionality, increasing productivity by optimizing acceleration time and deceleration while improving the quality of winding.

The goal is achieved by the fact that the known electric axial winding is: and, containing the setting unit and the controller nat 5

ten

15

0

five

0

five

0 5

0 5

the current sensor and the current controller of the winding motor and the thyristor converter, while the tension adjuster is connected to the first input of the tension controller, the winding electric motor is connected to the output of the thyristor converter through the current sensor, the input of which is connected to the output of the current regulator, the first input connected to the current sensor, a voltage sensor, a tension correction unit as a function of the roll radius, two multipliers, a memory device, a comparator, a maximum input signal selection unit, switch on device, initial installation and correction resistors and a source of stabilized voltage, the input of the voltage sensor connected to the output of the thyristor converter, the output of the voltage sensor connected to the first input of the first multiplier, the output of which is connected to the second input of the tension regulator, the output of the sensor current is connected to the first input of the maximum input signal selector unit, to the first input of the comparator and to the first input of the storage device, the second input of which is connected to the p through the switching device a guided output of a correction resistor connected to a source of stabilized voltage in parallel with the initial installation resistor, the adjustable output of which is connected to the second comparator input, the output connected to the third memory input, the output of which is connected to the second input of the maximum input signal selector, the third input with an adjustable output resistor initial setup, and the output is connected to the second input of the first multiplier, the first input of the second multiplier and h Res block tensioning correction in function of the radius of the roll is coupled to a third input of regulator tension torus, whose output is connected to the second input of the second multiplier and the output of the second multiplier is connected to the second input of the current regulator torus.

Compared to the prototype, the tension is maintained more accurately by increasing the reliability of operation by eliminating the mechanical sensor, the functionality of the device is expanded: operation in the winding and unwinding modes, formation of a roll of a given structure, calculation of the radius is possible.

The device also makes it possible to increase productivity by optimizing the acceleration and deceleration times, since it can be used to memorize the winding radius.

(unwinding) at breaks of a cloth and stops of the machine.

The drawing shows a structural diagram of the drive.

The axial-winding electric drive contains a setting device 1 and a tension controller 2, a sensor 3 and a controller 4 for the current of the winding motor 5, and a thyristor converter 6, while the tension setting device 1 is connected to the first input of the tension controller 2, and winding the measles of the winding motor 5 through the sensor 3 current is connected to the output of a thyristor converter b, the input of which is connected to the output of current regulator 4 by the input connected to current sensor 3. The axial-winding electric drive also includes a voltage sensor 7, a tension correction unit 8 as a function of the roll radius, two multipliers 9 and 10, a memory 11, a comparator 12, a maximum input selection unit 13, a switch-on device 14, an initial setting resistor 15 and a resistor 16 of the correction. The stabilized voltage source 17 at the same time the input of the voltage sensor 7 is connected to the output of the thyristor converter 6, the output of the voltage sensor 7 is connected to the first input of the first multiplier 9, the output of which is connected to the second input tension regulator 2, the output of current sensor 3 is connected to the first input of block 13 for selecting the maximum input signal to the first input of comparator 12 and to the first input of memory 11 whose second input is connected to an adjustable output of correction resistor 16 connected to source 17 stabilized voltage in parallel with the initial installation resistor 15, the adjustable output of which is connected to the second input of the comparator 12, the output connected to the third input of the storage device 11, the output D which is connected to the second input of the maximum input signal selector 13, the third input of which is associated with the adjustable output of the initial installation resistor 15, and the output connected to the second input of the first multiplier 9, the first input of the second multiplier 10 and through the tension correction unit 8 as a function the coil radius is connected to the third input of the tension regulator 2, the output of which is connected to the second input of the second multiplier 10, the output of which is connected to the second input of the current regulator 4.

The drive axial winding operates as follows.

Tension regulation is performed indirectly according to the principle of maintaining constant power on the motor shaft:

P F V F.y-R E -1 SEED,

,

where and is the voltage on the electric motor core, V;

K-coefficient, which is selected during adjustment depending on the radius of the sleeve Rr.

The tension measure is the product, and the measure of the radius. For

In order to form a roll of the desired density, prior to the start of operation of the device, the tension correction function as a roll radius is introduced into the tension correction unit 8 as a function of the roll radius. AT

the storage device 11 stores information about the initial radius. If unwinding of a standard roll is required, the radius of the standard roll is entered into the storage device 11 from the initial installation resistor 15 through a comparator 12, which allows the output of information from the storage device 11 at. installation.

When unwinding non-standard roll

its radius is entered into the memory 11 through the switching device 14 from the correction resistor 16.

At the very beginning of the winding with R Knach.ust. signal from resistor 15 comes

to the multiplication unit 10 and adjusts the gain of the tension regulator 2, then with an increase in the winding radius R RHa4.ycT. (1 (initial setting)) the comparator 12 is triggered and allows the storage device 11 to memorize current information, i.e. from this moment the storage device 11 monitors the current and stores it, but the signal does not go to the output of the storage device 11

passes because the current of the core of the electric motor 5 of the winding exceeds the value of the current contained in the storage device 11. and passes through the first channel.

If a break or a break occurs,

when the system is turned on again, the core current of the electric motor 5 will be less than the value of the current stored in the storage device 11, and the multiplication unit 10 on the second channel will receive information from the current storage device 11 at the moment of interruption and bring the system into correspondence with it; the current through the second channel will flow until the core current of the winding motor 5 exceeds the current stored in memory 11. After that, the current flows through the first channel again, and memory 11 tracks it.

This technical solution allows you to calculate the roll radius indirectly, which does not require cumbersome radius calculation schemes, and also allows you to memorize the radius at the moment of breakage or the radius of the original roll, which, in turn, makes it possible to increase the productivity of the rewinder.

The electric drive can be used both with axial winding and axial unwinding, which expands its functionality in comparison with the prototype. The simple logic of the operation makes it easier to diagnose the tension control system of the drive axial winding - unwinding.

Increasing the tension maintenance accuracy will decrease the number of web breaks, which will lead to an increase in reliability and performance ,.

Optimizing the acceleration and deceleration times in the roll radius function also gives an increase in productivity.

On the whole, this gives an increase in productivity, for example, a supercalender, by 1%. That allows releasing an additional 2-3 tons of calendered paper per day.

Claims (1)

Invention Formula An axial-winding electric drive containing a setpoint adjuster and tension controller, a current sensor and a current controller of the winding motor, and a thyristor converter, while the tension device is connected to the first input of the tension controller, and the winding measles of the electric motor are connected to an output converter of the winding converter The input of which is connected to the output of the current regulator, on the first input connected with the current sensor, characterized in that, in order to increase the accuracy of tension maintenance by increasing reliability, expanding the functionality, increasing productivity by optimizing the acceleration and deceleration time while improving the quality of winding; a voltage sensor, a tension correction unit as a function of the roll radius, two multiplier, memory, comparator, maximum input signal selection unit, switching device, initial setting and correction resistors and a source of stabilized voltage, the input of the voltage sensor is connected to the output of the thyristor converter, the output of the voltage sensor is connected to the first input of the first multiplier, the output of which is connected to the second input of the tension regulator, the output of the current sensor is connected to the first input of the maximum input selector unit, to the first input the comparator and to the first input of the memory device, the second input of which through the switching device is connected with the adjustable output of the correction resistor connected to the source of the stabilized voltage of the pairs An initial installation resistor, the adjustable output of which is connected to the second input of a comparator, an output connected to the third input of a storage device, the output of which is connected to the second input of a maximum input selector unit, the third input of which is connected to the adjustable output terminal of the initial installation, and the output connected to the second input of the first multiplier, the first input of the second multiplier and through the correction unit The tension in the roll radius function is associated with the third input of the tension regulator, the output of which is connected to the second input of the second multiplier, and the output of the second multiplier is connected to the second input of the current regulator. Vsconst