SU1499315A1 - Follow-up system - Google Patents

Abstract

The invention relates to the chemical industry and can be used in installations for growing single crystals. The aim of the invention is to increase the smoothness of the system in a steady state. The goal is achieved due to the fact that in it the proportional and differential laws of regulation are switched depending on the sign of the linear combination of the setpoint and mismatch signals, and the transmission coefficient of the speed feedback depends on the control signal module and on the sign of the production of control signals and speed feedback. 1 il.

Description

The invention relates to chemical industry and can be used in single crystal growth plants.

The aim of the invention is to increase the smoothness of the system in steady state.

The drawing shows the block -Sch- .. ma system ...

The block diagram includes the error meter 1, the first amplifier 2, the first switch 3, the first adder 4, the amplifier 5, the power, the executive motor 6, the gearbox 7, the differentiator 8, the second and third amplifiers 9 and 10, the second adder 11, the fourth amplifier 12, third sz M-mater 13, tachogenerator 14, first relay unit 15, first multiplier 16, detector 17, second multiplier

18, the setting device 19, the second relay unit 20, the second key 21.

As a detector I7, a linear push-pull detector can be used, which has a characteristic of titration of a module.

A second order differentiator is used as differentiator 8.

The system works as follows.

Output signal x; the setting device 19 is fed to the second input of the error meter 1, to the second input of which the output signal x of the gearbox 7 arrives, and at its output the error signal S. X | -h.

This cf signal is applied to the input of the first amplifier 2, at the output of which a signal is generated. -O, where

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CO SO

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KIJ - amplifier transmission ratio 2.

The signal Hd is fed to the input of the third amplifier 1Q, the signal U, (, x) is formed at its output. This signal arrives at the first input of the third adder 13, the second output of which receives the error signal O, and the signal U is formed at its output x, which is fed to the input of the fourth amplifier 12, the output of which is formed

signal

The signal and, (fed to the input of the second relay unit 20, at the output of which a signal of the form

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(1, if Ui2 D; O,

if U (2 $ O.

The signal is fed to the control input of the second key 21. The error signal a is also fed to the input of differentiator 8, s

. the output of which the signal from 7G

steps to the input of the second amplifier 9.. From the output of the second amplifier 9, the signal is fed to the first information input of the second key 21, the second information input of which receives the signal Ui from the output of the first amplifier 2,

In the case when, the second: the key 21 closes. the first information input to the output and at its output we get a signal,

If, the second key 21 closes the second information input to the output and at its output we have the signal Ugi.

UK signal arrives at first. the input of the first adder 4, the second input of which receives the output signal of the second adder a 11, and at its output a signal U Ua, -U, is generated.

The signal I4 is fed to a power amplifier 5, at the output of which a signal is generated where Kg is the gain of the power amplifier.

The signal Us is fed to the input of the executive divider 6, at the output of which the signal is formed, U5 where Kf, is the transmission coefficient of the executive

wearable engine 6-,

The signal Uft is fed to the input of the gearbox 7, the output of which forms UH

There is a signal, where K- is the transfer-gear ratio 7, which is fed to the first input of the error meter 1, and the signal is fed to the input of the tachogenerator 14, at the output of which the Signal is generated (, where 14.

The signal enters the first input of the first multiplier 16, the second input of which receives the output signal U / T. the detector 17, and at its output a signal is formed

U, -lUgil.

In addition, the signal arrives at the first input of the second multiplier 18 to the second input of which a signal U (2 arrives, and at its output a signal is generated, Ui2.

The signal is fed to the input 21 of the first relay unit 15, at the output of which a U / g signal is formed

1, if and / o

and 5

.Oh, if 6 O.

The signal arrives at the control input of the key 3, the information input of which receives the signal U (j, and at its output forms the Signal U-j, of the form

Iuij, if and,. U (b if Ui5 0.

The signal Ug arrives at the second input of the second adder 11, the first input of which receives the signal U from the output of the tachogenerator 14, and at the output of the second adder 11 a signal U {f is generated.

The principle of correction of this system is as follows. The signal V applied to the second input of the error meter 1 is monitored by the executive motor 6.

A control signal is generated at the output of cjTMMaTopa 4, for which a signal is supplied to its first input. To the second input of C5 gmmator 4, a signal consisting of two components, the first proportional to the rotation speed of the upstream shaft, and the second, about

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portion of the product u cr. Ux4 generated by the first multiplier 16 in the channel for forming the magnitude of the nonlinear correction signal.

Due to a change in the damping coefficient, the quality of the transient process is improved, and this change occurs in odd quarters of oscillations, and in even quarters of oscillations the damping remains constant.

In addition, in order to improve the smoothness of the system in the established mode, the signal Ug, depending on the control signal of the second key 21, has the form

if (5-K, iX) 0;

and

iKqe if K ((5-K, zX) 0.

In the transient mode, with a large magnitude of the error signal S, the control signal is formed depending on the magnitude of the matching signal and the magnitude of the nonlinear correction signal.

and, UM-US; U Urn -i ,,;

 if 1; and if 0o

When the error signal is reduced to a value (where the value determines the range of tolerances of the rotation angle of the output shaft of the system, the second key 21 opens the signal transmission circuit and closes the cdb signal transmission circuit.

This achieves a maximum of smoothness in the steady state mode.

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the criterion de taking into account the change in the damping coefficient in the even-odd quarters of the oscillations and the constant value of the damping in the even quarters of the oscillations,

Thus, the proposed follow system allows to achieve a high degree of smoothness in the mouth.

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new mode, retaining high speed in transient conditions,

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Claims (1)

Formula of inventions A tracking system comprising a series-connected first adder, a power amplifier and an executive motor, the shaft of which is kinematically connected to the tachogenerator shaft and the gearbox input shaft — connected by the output shaft to the first input of the error meter, the second input connected to the output of the setpoint generator, and output - to the input of the first amplifier; the output of the tachogenerator is connected to the first inputs of the first multiplier, the second adder and the second multiplier, connected by an output to the input of the first relay unit, and the second input - the first input of the first adder and the detector input connected by the output to the second input of the first multiplier connected by the output to the information input of the first key connected by the control input to the output of the first relay unit, and the output to the second input of the second totalizer connected by the output to the second input of the first adder, that is, so that, in order to increase the smoothness of the system in a steady state, the series-connected differentiator is additionally introduced, the second a second key and a third amplifier, a third amplifier, a third adder, a fourth amplifier and a second relay unit connected by an output to the control input of a second key connected by a second information input to the output of the first amplifier, and an output to the first input of the first adder, meter output the error is connected to the input of the differentiator and to the second input of the third adder, the output of the setter is connected to the input of the third amplifier.