SU1513610A1 - Multimotor electric drive of supercalender - Google Patents

Description

The invention relates to electrical engineering and can be used in the electric drive of the supercalender when axially winding a flexible deformable material into rolls. The aim of the invention is to improve the accuracy of maintaining the tension of the material during winding on the axial roll. The device includes an electric motor calender battery 1, an overrun electric motor 2, impulse sensors 3 speeds, thyristor converters 4, digital speed regulators 5. The goal is achieved through digital processing of information and control signals, as well as through the creation of a dual-circuit system of subordinate regulation of the material tension with a restriction in the function of the radius of us

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1513610 A1

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1513610

The invention relates to electrical engineering and can be used in the electric drive of a supercalender with axial winding of a flexible deformable material into rolls.

The purpose of the invention is to improve the accuracy of maintaining the tension of the material during winding on the axial roll.

The drawing shows the diagram 10

electric drive.

The electric drive contains an electric motor 1 of a calendering battery 1 and · an electric motor 2 overruns, each of which is equipped with a pulse sensor 15 3 speeds, a thyristor converter 4 and a speed controller 5, and the output of speed controller 5 is connected to the input of the thyristor converter 4, the output of which is connected to 20 anchor winding of the motor 1 (, 2), counter 6, buffer register 7, digital-to-analog converter 8, the output of the pulse sensor 3 of the speed of the electric motor 1 of the calender battery is connected to the input of the counter 6, the output account The sensor 6 is connected to the input of the buffer register 7, the output of which is connected to the bit inputs of the digital-to-analog converter 30. In addition, the 5'-speed regulators are digital, and the electric drive additionally includes the master frequency generator 9, the first 10 and second 11 converters 35 frequency, scale divider 12, controlled frequency divider 13, frequency divider 14, first 15 and second 16. short pulse formers, tension adjuster 17. 40

The output of the master frequency generator 9 is connected to the input of the first frequency converter 10, the output of the first frequency converter 10 is connected to the input of the second frequency converter 11 and the first input of the digital speed controller 5 of the electric motor 1 of the calender battery 1, the second input of which is connected to the output of the scaler 12 The input 59 of the scale divider 12 is connected to the output of the pulse sensor 3 of the speed of the electric motor 1 of the calendar battery. The output of the second frequency converter 11 is connected to the first 55 input of the digital regulator 5 of the speed of the electric motor 2, the second input is connected to the output of the controlled frequency divider 13, the information input of the latter is connected to the output of the pulse sensor 3 of the electric speed of the 2 roll forward, and the discharge inputs are connected to the output of the buffer ? register 7.

The output of the pulse sensor 3 speed of the electric motor 2 overlap is also connected to the input of the frequency divider 14, the output of which is connected to the input of the first driver 15 short pulses.

The output of the first shaper 15 short pulses is connected to the input of the overwriting permission of the buffer register 7 and with the input of the second shaper 16 short pulses whose output is connected to the reset input of the counter 6. The output of the setpoint generator 17 is connected to the input voltage reference of the D / A converter 8. The output of the D / A converter 8 is connected to input adjustable current limit thyristor converter 4 electric motor 2 nakata.

The drive works as follows.

An oscillating frequency generator produces an electrical signal with a frequency of £ _o . Using the first frequency converter 10, the frequency of setting the linear velocity of the calender rolls £ _{e is set} , in the form

where Ν _{? 1} is the speed setting of the calender rolls.

K - conversion factor.

The second frequency converter 11 sets the frequency of setting the linear overrun speed of '£ _zg as

c = e · ¹ '

e.h to

where N is the roll forward speed setting.

In this case, the difference in the frequency of the task £ _? , £ 3.2. determines the required tension of the material between two adjacent sections, provided by the difference of their linear velocities.

When the supercalender is working at the output of the pulse sensor 3 speed

electric motor 1 of the calender battery 1 produces pulses whose following frequencies are £ ^ proportional to the linear speed of the calender shafts whose radius is constant. This frequency is a feedback signal that is compared through the scale divider 12 at the input of the digital speed controller 5 with the reference frequency £ _{} 5} , In addition, pulses with a frequency of £ _os , arrive at the information input of counter 6.

The output signal of the pulse sensor 3 speed of the electric motor 2 overrun is fed to the input of the frequency divider 14, having a division factor equal to the resolution of the pulse speed sensor 3. Therefore, on each revolution of the electric motor 2 overrun at the output of the frequency divider 14, one pulse is produced, which is fed to the input of the first shaper of short pulses. A short pulse appears at the output of the first shaper of 15 short pulses, the leading edge of which opens the permission input for overwriting the buffer register 7. As a result, the number accumulated in counter 6 for one revolution of the roll-over electric motor 2 is recorded in buffer register 7 “Simultaneously the back edge of the pulse the first shaper 15 short pulses causes a short pulse at the output of the second shaper 16 short pulses, which is fed to the reset input of the counter 6, In this way recorded in the coming erasing .6 counter number with a delay equal to the duration of the first pulse shaper 15 short pulses.

Thus, in the buffer register 7, the number Ν * will always be written, which is proportional to the actual value of the reel roll radius. This number, acting on the input of the controlled frequency divider 13, forms the feedback frequencies at its output.

g ίι · χ

^£ OSL = - where £ ₂ - the frequency of the signals at the output of the pulse sensor 3 speeds of the electric motor 2 roll;

K - conversion factor.

Feedback Frequency ·

£ ¢¢ ^ is compared at the input of the digital 10 th regulator 5 of the speed of the electric motor 2 overrun with the reference frequency £ _{2 2} , and their difference is the error signal of the digital regulator 5 of the speed.

With an increase in the overrun radius, the frequency £ _ox. X increases, which leads to a decrease in the angular velocity of the overturn and the preservation of its linear velocity, and hence the tension of the material.

At the same time, the number Ν * from the bit outputs of the buffer register 7 is fed to the bit inputs of the digital-to-analog converter 8, to the input of the reference voltage from the output of the tension setting device 17 a tension command P is given, and a signal is generated at the output of the digital-analog converter 8

where η is the number of input bits of the digital-to-analog converter 8.

The output signal of the digital-to-analog converter 8 is fed to the input of the adjustable current limiting of the thyristor converter 4 of the overrun motor 2 and sets its maximum current in accordance with the specified tension and the actual value of the roll-up roll radius,

Thus, there is a dual-circuit tension control system with an armature current control loop for an overrun motor 2.

Claims (1)

Claim A multi-motor supercalender electric drive containing a calender battery motor and a run-up motor with a pulse speed sensor, each of which is equipped with a subordinate control system, the output of the pulse motor speed sensor of the calender battery is connected to the counter input, the counter output is connected to the input of the buffer register, the output of which is connected to the bit digital-to-analog converter inputs, characterized in that, in order to improve the accuracy of maintaining tension Therians at 1513610 wound onto an axial reel, it additionally introduces a master frequency generator, the first and second frequency converters, a scale divider, a controlled frequency divider, a frequency divider, the first and second short pulse shapers, the setpoint adjuster, speed regulators are digital, and the current regulator is equipped with a current block limit, the driving frequency of the generator output is connected to the input of the first inverter, an output of first frequency converter ¹ soe-, of the connections to the input of the second inverter portions you and the first input of the digital regulator calendering speed motor battery, the second input of which is connected to the output 2 scale divider, the input of the scale divider is connected to the output of the pulse-speed sensor of the electric motor of the calendering battery, the output of the second frequency converter is 2 tons connected to the first input of the digital roll-up motor speed controller, the second input of which is connected to the output of the controlled frequency divider, the information input of the latter is connected to the output pulse speed sensor motor overrun, and the discharge inputs are connected to the output of the buffer register, the output pulse speed sensor electrode An overrun driver is also connected to the input of a frequency divider, the output of which is connected to the input of the first short pulse shaper, the output of the first short pulse shaper is connected to the re-write enable input of the buffer register and the second short pulse shaper input, the output of which is connected to the counter reset input, the output of the tension setter is connected to the input voltage of the digital-to-analog converter, the output of the digital-to-analog converter is connected to the input of the current limiter block of the regulator t overrun electric motor.