SU1059542A1 - Electric drive automatic control device - Google Patents

Abstract

An AUTOMATIC ELECTRIC CRYBAL CONTROL DEVICE, containing a series-connected pulse generator and a time interval generator, as well as a series-connected master and a key connected by an output to an electric drive, characterized in that, with integer improvements of control accuracy, a delay element, an inverter and an element, the output of which is connected to the control of the key input, and the inputs are connected to the output of the time interval generator and the inverter, respectively, to the output of the delay element ki, an information input coupled to an output of the pulse generator and the control input - with the output setpoint. 9

Description

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This invention relates to the automatic control of an imM actuator, in particular continuous casting plants.

A known analog control device, which contains a controlled pulse generator and a controlled time interval driver sequentially connected to it, built on a waiting multivibrator. The output signal of the device in the form of a sequence of rectangular pulses with a predetermined follow-up period and a duty cycle control the supply of a command signal for the operating speed of the CO drive

The disadvantage of such a device is the low accuracy of its operation, since its structural limitation does not allow the formation of a time control signal, taking into account the drive deceleration time, which at 3 accelerated acceleration is in direct relation to the operating speed of the drive.

The purpose of the invention is to improve the accuracy of operation by adjusting the deceleration time depending on the set drive speed.

The goal is achieved by the fact that a pulse generator and a time generator, as well as sequentially connected master and key, connected by an output to the actuator, are introduced into an electric drive control device, as well as a delayed element, an inverter and an element whose output connected to the control input of the key, and the inputs are connected respectively to the output of the time interval generator and, through the inverter, to the output of: a delay element whose information input is connected to you during the pulse generator, and the control input is with the master output.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - time diagram of his work.:

The device contains an electric drive 1, a generator of 2 pulses, a driver of 3 time intervals, a delay element 4, an inverter 5, an AND 6 element, an operating speed setpoint 7, a key 8,

Device7: in works as follows.

The controlled pulse generator 2, defining the time period -tj, simultaneously starts the time interval imaging unit 3 and the time delay element 4. From the output of the time interval generator, a signal in the form of a rectangular pulse with a duration EF equal to the specified operating time of the drive for one period, passes to the first input of element 6. And there is a direct dependence between the deceleration time t of the drive until it stops completely and the value of the operating speed of the drive from which the braking begins, is due to the fact that the braking process proceeds with constant acceleration of deceleration. The operating speed of the drive is set using the setting device 7, the crust, from which the signal in B1aede voltage, proportional to the speed, is fed to the controlled, input of the time delay element. The time delay element in accordance with the speed reference signal generates a rectangular pulse with a duration equal to the deceleration time of the drive tr®. The inverter 5 supplies it to the second input of the logic element AND, C the output of the element AND the signal in the form of a rectangular control pulse with duration correlation

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is fed to the control key input 8,

If the deceleration time is not taken into account in the control signal, the error in the time signal processing by the drive will be equal to t-j, and t-g will be different for different values of the operating speed.

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The electric drive operating in cyclic mode is set to the operating mode, characterized by strictly defined parameters, time

duty cycle CPU) time of the drive in the cycle (tp). The proposed device allows controlling the operation of the drive with the accounting of the deceleration time.

Claims (1)

AUTOMATIC ELECTRIC DRIVE CONTROL DEVICE ', containing a' pulse generator and a time interval shaper connected in series, as well as a serially connected switch and a key connected by an output to the electric drive, characterized in that, in order to increase the control accuracy, a delay element, an inverter are introduced into it and the And element, the output of which is connected to the control input of the key, and the inputs are connected respectively to the output of the shaper of the time interval and through the inverter to the output of the delay element, in the formation input of which is connected to the output of the pulse generator, and the control input is connected to the output of the setter. . _β 11059542