SU1296941A1 - Indicator of limit values of angular velocity - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to increase the reliability and noise immunity of the signaling device h. account reservation of its circuit elements. During the rotation of the shaft 13 pulse signals AGU // (L F, T ffwxffff r

Description

sensors 1-1, 1-2, and 1-3 are transmitted to the subtraction inputs of counters 2-1, 2-2, and 2-3, through which angular velocity measurement cycles are organized. In the event of a sensor 1-1 or counter 2-1 failure, the setting device 7-1 will continue to work without deviations; after the measurement cycles are over, voltage pulses from output 1 will come to its input

The invention relates to a measurement technique and is intended for use in automatic control systems for the limiting values of the angular velocity of various objects of increased reliability.

The purpose of the invention is to increase the reliability and noise immunity of the signaling device by reserving its circuit elements.

Figure 1 shows the functional diagram of the proposed detector; Fig. 2 is a diagram of one of the options for building a driver for output commands.

The signaling device contains pulse sensors 1-1, 1-2 and 1-3 speeds, counters 2-, 2-2 and 2-3, triggers 3-1, 3-2 and 3-3, majority elements 4-1, 4- 2 and 4-3, delay elements 5-1, 5-2 and 5-3, shaper 6 output commands and setting units 7-1, 7-2, 7-3 of the limiting values of the angular velocity, each including counters 8 and 9 and generator 10 reference frequency.

No. Pulse speed sensors, made, for example, in the form of inductors, are located around the circumference of the disk 1 I, made of a non-magnetic material, the magnetic inserts 12-1 ... 12-Z are evenly fixed on the outer diameter of which. The disk 11 is mounted on the shaft 13, the speed of which is controlled by the proposed detector. Sensors 1-1 ... 1-3 are rotated relative to each other at angles that are multiples of the step of inserts 12 (at Z / 3).

Shaper 6 output commands contains (figure 2) triggers 14-1, 14-2

Dov counters 2-2 and 2-3 through the major element A-1. The passage to the input of any counter 2-1, 2-2 and 2-3 of the pulse signal of interference will not affect the accuracy of the measurement of the angular velocity, since the synchronous operation of the major elements 4-1, 4-2 and 4-3 will be carried out when you count up to zero other counters. 2 hp ff, 2 ill.

and 14-3, And 15-1, 15-2 and 15-3 elements, majority elements 16-1, 16-2, and memory elements 17-1, 17-2. Building shaper 6 may be different.

For example, if it is necessary to control only one threshold of angular velocity, a part of the circuit elements can be excluded from its composition. Further, the majority convolution scheme of the generated signals may have a different appearance if the output of the detector is implemented with the redundancy of all the elements.

The detector works as follows

in a way.

When the shaft 13 is rotated, for example, with a constant angular velocity 03, at the output of each of the sensors 1 -1, 1-2 and 1-3, a sequence of voltage pulses is formed, the period of which is determined from the expression

t.

about.

2

7.W:

(one)

where - the angle between the magnetic inserts 12-1 ... 12-Z; Z is the number of magnetic inserts.

The pulse signals from sensors 1-1, 1-2, and 1-3 are transmitted to the subtraction inputs of counters 2-1, 2-2, 2-3, through which the angular velocity measurement cycles are organized. Namely

when scoring the contents of these counters to zero, voltage pulses are generated at their outputs, which switch the triggers 3-1, 3-2 and 3-3 to a single state. When entering entrances

majority elements 4-1, 4-2 and

A-3 electrical signals from any two triggers 3-1, 3-2, 3-3, they are opened, as follows: state-scheme modifications: to counters

8receivers 7-1, 7-2, and 7-3 write the prefix code N j, corresponding to the maximum allowable angular velocity; in counters

These same drivers are recorded

code preset N, corresponding to the level of the smallest angular velocity "and". when beyond the limits of which an emergency situation may occur in a controlled object; after a period of time sufficient to perform all operations for switching the circuit and equal to the setting of delay elements 5-1, 5-2, 5-3, the triggers 3-1, 3-2 and 3-3 are reset to the initial state, and a counter code n defining the number of periods tj selected for setting the cycle for measuring the angular velocity is recorded in counters 2-1, 2-2 and 2-3.

Duty cycle is equal to

T. 1 7, CJ

 (2)

During this cycle, a code equal to

N T-f 2 f ° Z s.

 IT 3)

where f is the reference frequency generated by the generators 10;

P2-1T.

V. -. „-F is a constant coefficient.

7-,

If the angular velocity at which the shaft 13 rotates is within the operating speed range i.e. a) „: 03 f then the readable code N. transcends the preset code tt of counters 9, but is greater than the preset code. Therefore, when the contents of the counters B to zero are counted, voltage pulses are generated at their outputs, which switch the triggers 14-1, 14-2 and 14-3 of the driver 6 to the zero state and close the elements 15-1, 15-2 and 15-3. The signals at the output of the majority element 16-1 are not output. At the end of the measuring cycle T, the triggers 14-1, 14-2 and 14-3 are reset.

fO 5 0 25

thirty

,

35

45

40

, 50 55 If the shaft 13 begins to rotate with an angular velocity exceeding the permissible value (a1 „„ „o), then for a time interval equal to the duration of the measuring cycle T., the contents of counters 8 are not read to zero and the elements 15-1, 15 -2, 15-3 are open for the passage of voltage pulses generated at the outputs of the majority elements 4-1, 4-2 and 4-3 to the inputs of the element 16-1 and further to the input of the memory element 17-1. The latter converts these pulses into a potential signal transmitted to the first output of the imaging unit 6.

In those cases when the angular velocity of the shaft 13 becomes less than the permissible level (f - i and 5 "), the duration of the measuring cycles T; become sufficient to read to zero the contents of the counters 9. The latter form voltage pulses that go to the inputs of the majority element 16-2 and are stored by the element 17-2. At the second output of the driver 6, a potential signal appears, which is the output signal of the device.

In the event of a failure of the sensor 1-1 or of the counter 2-1, the setting device 7-1 continues to work without any deviations, because after the measurement / cycles are finished, voltage pulses from the outputs of the meters 2-2 and 2-3 (through majority element 4-1). The operability of the detector is also maintained when two local faults appear, for example, in the sensor 1-1 ... trigger 3-1 and majority element 4-2 ... AND 15-2 element.

The passage to the input of a counter 2-1, 2-2 and 2-3 of the pulse signal of interference does not affect the accuracy of the measurement of the angular velocity, since the synchronous operation of the majority elements 4-1, 4-2 and 4-3 takes place when reading to zero other counters.

Claims (1)

1. The angular velocity limit indicator, containing the first impulse velocity sensor, the output of which is connected to the subtractor input of the first counter, and the first angle limit setting unit five h a speeds, characterized in that, in order to increase the noise level and noise immunity of the signaling device, second and third impulse velocity sensors are introduced, the outputs of which are connected to the subtraction inputs of the second and third counters, respectively, the second and third limit values of the angular velocity , three flip-flops, three delay elements, three major elements and a driver for output commands, the outputs of which are the outputs of the detector, while the output of each of the counters is connected via a trigger to the same inputs Dami majority elements, the outputs of which through the delay elements are connected to the rewriting inputs of the corresponding counters through the setting devices of the angular velocity limit values - with the first and second inputs of the output command generator, respectively, and connected directly to the third inputs of this one shaper. 2, The alarm device according to claim 1, which is based on the fact that the setpoint device with JO 20 69416 The limiting angular velocities contains two counters, the overwriting inputs of which are connected to the admittance input, and a reference frequency generator, the output connected to the input terminals of the counters, the outputs of which are the outputs of the setter. 3, a signaling device according to claim 1, characterized in that the output command driver contains three flip-flops, three AND elements and two majority elements, the outputs of which are connected to the shaper outputs through memory elements, and its first inputs are connected to the first trigger inputs , the second inputs of the triggers are combined with the first inputs of the AND elements and connected to the third inputs of the imager, respectively, the inverse outputs of the triggers are connected to the second inputs of the corresponding And elements, the outputs of which are connected to the inputs of the first master animal item a, and the inputs of the second major element connected shaper. with second entrances Compiled by J. Murcuko Editor N. Kishtulinets Tehred A. Kravchuk Proofreader E. Roshko Order 772/47 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk naS)., 4/5 Production and printing company, Uzhgorod, st. Project, 4