SU659952A1 - Rotational speed monitoring device - Google Patents

Description

the trigger is connected to the output of the third copuncture.

The drawing shows a block diagram of the proposed device.

The structure of this device as the main functional units includes a frequency-connected frequency sensor 1, a driver 2 input pulses, a switching unit 3, the first conjunctor 4, a counter 5, a block 6 of conjunctors and a second counter 7, the second conjunctor 8, the first input of which is connected to the third input of the first conjunctor a 4, and the output with the second input of counter 5, the third, fourth and fifth conjunctors 9, 10 and 11, the driver 12 of the control command, the first output of which is connected to the third input of the first conjunctor 4, and the second output is e at third entrances of the fifth conjunctors and through the fourth conjunctor 10 - with the second input of the second counter 7, the distributor 13 pulses, the first output of which is connected to the second input of the imaging unit 12 control command, the second output with the second inputs of the switching unit 3 and the second conjunctor 8 and through the third driver 9 - with the second input of the block b of conjunctors, trigger 14, output conjunctor 15, disjunctor 16, generator 17 reference frequencies, the first output of which is connected to the second input of the first conjunctor 4, the second and third outputs - with t There are third inputs of the fourth and fifth conjunctors 10, 11, and a third counter 18, the first input of which is connected to the output of block 6 of conjunctors 6, the second input — with the output of the fifth conjunctor 11, and the output - with the second input disjunctor a 16. Input the pulse distributor 13 is connected to the second input of the fourth conjunctor 10, the first input of the fifth conjuncer I, and the output of the switching unit 3. The output of the second counter 7 through the trigger 14, the output conjunctor 15 is connected to the first input of the disjunctor 16. The second input of the output conjunctor 15 is connected to the first output of the distributor 13 pulses, the second input of the trigger 14 - to the output of the third conjunctor 9.

The proposed device for controlling the rotational speed before issuing the command "Control works in the mode of measuring the rotational speed, and after issuing this command, in the mode of controlling the rotational speed of the shaft.

The control of the speed of rotation of the shaft, the microscope, is determined by monitoring the duration of each period of the signal following the frequency from the sensor, which occurs as follows. After the command "Control" is proposed in the proposed device, the number No is stored, which corresponds to the measured duration of the controlled period Tm of the next one at the moment of issuing this command (No Tc). Then, the device compares the numbers N and L2, corresponding to the duration of the controlled period Tk, multiplied by the coefficients Ci and Yag, with the stored number NO. The coefficients a and az are determined by the permissible levels, respectively, of the increase in the II decrease in the shaft rotation speed, i.e.

 a, n - a, -g ,,,

where If LA, L / o (n ui “p) or

 "2" p) then the proposed device generates an output signal.

The device works as follows. Before the arrival of the command “Control trigger 14 and driver 12 teams

the control is in the initial state, while from the output of the trigger 14 to the input of the output conjunctor 15 a closing signal is supplied, from the first output of the driver 12 of the control command to the input of the first

4 and the second 8 conjunctors - the opening signal, and from the second output of the imaging command of the control command, the inputs of the third 9, fourth 10 and fifth And conjunctors are given the closing signal.

The signal from the frequency sensor 1 is fed to the shaper 2 input pulses, producing a pulse, on the leading edge of which the installation of the switching unit 3 to the initial state occurs,

in which, from its output to the input of the first 4, fourth 10 and fifth of 11 conjunctors, there is a closing signal. The first conjunctor 4 closes and the flow of signals from the generator 17 of the reference frequencies to the counter 5 stops.

Simultaneously, the signal from the output of the switching unit 3 is fed to the input of the distributor 13 pulses and starts it. In this case, at the first output of the pulse distributor, an opening signal appears, which is fed to the second inputs of the output conjunctor 15 and the driver 12 of the control command. Since the first inputs of these functional elements have closing signals, they do not change their state.

After a period of time from the start of the start of the distributor 13 pulses, determined by the switching time of the functional elements of the circuit, the pulse at the first output of the distributor 13 disappears, and at its second output a pulse appears that goes to the inputs of the second 8 and third 9 conjunctors and 3 switching units . Since, at the same time, an opening signal is also supplied to the other input of the second conjunctor 8, a pulse appears at its output, which is fed to the second input of the counter 5, and the counter is reset.

At the trailing edge of the second output pulse of the distributor of 13 pulses, the switching unit 3 is placed in a working state, and an opening signal is given from its output to the inputs of the first 4, fourth 10 and fifth 11 conjunctors. Since the other inputs of the first conjuncture 4 also have an opening signal, the generator 17 signals of the reference frequency with a frequency O are fed to the input of the counter 5, which is filled to the fo-7PC value with the arrival of the next signal from the frequency sensor 1, the process is repeated.

After issuing the command "Control to the first input of the form-controller of the control command 12, the latter goes into standby mode. With the arrival of the next pulse from the frequency sensor 1, the distributor of 13 pulses starts, the pulse from its first output goes to the second input of the driver 12 of the control command and sets its front edge to the control mode. In this case, from the first output of the imaging command of the control to the first 4 and second 8 conjunctors, a closing signal is given, and from the second output to the third 9, fourth 10 and fifth 11 conjunctors, an opening signal.

After that, after a period of time, a pulse appears at the second output of the pulse distributor 13, which arrives at the first input of the third conjuncer 9. Since the second input of this conjunctor from the driver 12 of the control command has a disconnecting signal, a pulse appears at its output which opens the conjuncer block 6 and enters the second input of the trigger 14. In this case, the number filled in the counter 5 is rewritten in the return code into the second 7 and third 18 counters, and the trigger 14 is set to the state in which from its output to An input to the output conjuncture 15 is given an opening signal.

At the falling edge of the pulse from the second output of the pulse distributor, the switching unit is installed in the operating state. The inputs of the fourth 10 and the fifth 11 conjunctors are opened, and the generator signals of 17 reference frequencies arrive at the second 7 and third 18 counters. The counter 7 is filled with the frequency fi ai-fo, the counter 18 is filled with the frequency / 2 a2- / o, where

"eleven; “2 1;

If the counter 7 does not have time to fill in a time equal to the duration of the monitored period T, then with the arrival of the next signal of the frequency sensor 1, the switching unit 3 is reset to the initial state, the counters 7 and 18 stop filling, the pulse distributor 13 is started. The opening pulse from the first output of the distributor is fed to the second input of the output conjunctor 15, and since the first input signal is given to the opening signal from the output of the trigger 14, the output conjunctor 15 generates a pulse, which through the disjunctor 16 goes to the output of the proposed device.

In this case, the signaling condition can be determined by comparing the number

NO o-Tp recorded in the first counter, with the number .Vi f 1 TK, corresponding to the number of pulses received in the second counter in a time equal to the duration of the monitored period T ,,, Л

L-7 to / about-7p

f. .L

  f.

. /about

Considering that Oi 1 and “60-f,

/about

we get the alarm condition for increasing the speed of rotation

.

At the same time, the relative tolerance for PDP

speed equalization

percentage does not depend on the rate of rotation of P and is a constant value

3: .100Q /: - -1000 ,, - const.

where Pf: a, -PPI if the counter 7 has time to fill before the next signal of the frequency sensor 1 arrives, then at the moment of filling the counter 7 generates an output pulse, which sets the trigger 14 to its initial state. If after this the counter 18 is filled, then the latter produces at the moment of filling the output pulse, which is fed through the disjunctor 16 to the output of the proposed device.

The signaling condition in this case is determined in the same way as the previous

L.

/ 2 к, / о П

f

/ KS G / P - 2 / P

/about

to a2- "n,

BUT ,-",",.

Where

/about

In this case, the relative tolerance for the reduction of the rotational speed, expressed in

This percentage is also a constant wellness.

For

wed, - 1

100% :: --- 00% g

 (a, - 1) -100% -const,

where "cf, -rn-lpIf after filling the counter 7 it turns out that the counter 18 did not have time to fill in a time equal to the duration of the monitored period Tk, then with the arrival of the next signal of the frequency sensor 1, the switching unit 3 is reset 13 pulses, corresponding to the settings of the trigger 14, the second 7 and third 18 counters and the switching unit 3, after which a new control cycle begins.

Claims (2)

1. USSR author's certificate number 388229, cl. G 01 P 3/60, 1971. 2. For the number 2347153/10, cl. G OIP 3/46, 12.04.76, by which the decision to issue an author's certificate was made.