SU1363131A1 - Device for determining deviation of object movement speed from pre-set speed - Google Patents

Abstract

The invention relates to automation and can be used in control systems for drives of irrigation and casting machines in the production of film photographic materials and magnetic tapes, as well as in other branches of the national economy, where it is necessary to carry out automatic control of a given speed of movement of an object. The aim of the invention is to increase speed and accuracy. The goal is achieved by the fact that the device uses a special correction circuit, which allows to receive the same control signal (speed deviation from the set value in absolute value) for different tasks on the speed of movement. 2 Il. o (o (l oo

Description

This invention relates to automation. It can also be used in control systems for drives of irrigation and casting machines in the production of film photographic materials and a magnet of Puy tapes, as well as in other branches of the national economy where it is necessary to regulate automatically a given speed of a moving 10 NIN of an object.

The aim of the invention is to increase speed and accuracy.

In FIG. 1-1 azan block diagram of the device; in fig. 2 - If diagram of his work.

The device contains a pulse sensor 1, a digital-analogue converter 2, a generator of 3 pulses ,. reference voltage source 4, 20 pulse shaper 5, variable gain amplifier 6, comparison block 7, task block 8, limitation block 9 and pulse counter 10

The device works as follows;

Pulse sensor 1 converts the speed of movement into the frequency of the pulses that come from the output of the sensor 30 to the input of the driver 5 to them. pulses. and a digital-to-analog converter, 2 (Fig. 2a), a Zimpulsov shaper is designed to generate a pulse or set the counter 10–35 pulses to the state O after recording the state of the counter in the digital-to-analog converter 2.

Pulse counter 10 counts the number of pulses received 40 from the generator of 3 pulses during a single pulse period from sensor 1. This number is converted using a digital-to-analog converter 2 to a potential signal (Fig. 26). 45 Then, the variable gain amplifier 6 amplifies the signal. The gain of this amplifier is set from block 8 by the following equation: 50

-t--

where U (V) is the given speed value. At the same time, for different speed tasks, the output signals of amplifier 6 in the established operating range are identical (Fig. 2c). The signal is fed to one input of block 7

f

0 5

0 5

0 5 0

five

the second input of which is supplied by the reference voltage from the source 4 of the reference voltage. At the output of the comparison unit, we obtain the difference between the reference voltage and the signal from the output of amplifier 6 with a variable coefficient (Fig. 2d). The limiting unit 9 forms the necessary operating portion of the output signal of the device for outputting it to the speed control system (Fig. 2e). When the reference is changed (Fig. 2), the coefficient of the amplifier 6 changes, and the output signal of the device does not change by absolute value in the set range:

V, ± uV - 0. ± li; V ± 4V - О ± - JU;

Un 1 dV - b i li

where V, V, j ... V - set speed reference; UV is the range of speed deviations from the setpoint in which it is necessary to make regulation;

whether - the output signal range of the device. The use of the device will allow

improve speed and accuracy I

measuring and controlling the speed of the object.

Claims (1)

Invention Formula A device for determining the deviation of an object's speed from a predetermined one, comprising a pulse generator, a pulse counter, a pulse sensor, a digital-to-analog converter, a reference unit, a comparator unit and an amplifier, the output of the pulse generator connected to the pulse counter input, characterized in that speed and accuracy, a pulse shaper, a reference voltage source, a limiting unit, an amplifier are made with a variable gain factor, a pulse sensor output yuchen to the input of the pulse former and the input Record of the digital-analogue converter, the output of the generator The pulse bodies are connected to the second pulse counter input, the counting output of which is connected to the counting input of the digital-to-voltage converter, the first and second outputs of the voltage source are connected to the reference input of the digital-analog converter and the first input of the comparator, respectively, to the second input of which is connected variable gain amplifier output, the output of the reference block is connected to the variable amplification gain control input of the amplifier, to the information input of which the output of the digital-to-analog converter is connected, the output of the comparator is connected to the input of the limiting block whose output is the output of the device. Phie. 2