SU1439739A1 - Device for determining angular position of shaft - Google Patents

Abstract

The invention relates to automation and computing and is intended to convert information about the rotation angle into a number of pulses. The purpose of the invention is to increase reliability by using phase comparison of two sequences of rectangular pulses. B, a device containing the first and second phase shifters, a source of sinusoidal voltage, the first, 1st and second formers of a sequence of rectangular pulses, introduced five triggers, a decoder, two AND elements, two OR elements, an NOT element. Each phase shifter contains an inductive differential position sensor and a resistor, and each driver contains two resistors and a trap transistor. Improving the reliability of the converter is achieved by replacing the amplitude and amplitude-phase transformations of the sensor signals with a single transformation using a phase discriminator based on the phase comparison of two pulse sequences and discretely changing the operation mode when the phase difference of the two differential sensors is changed; angular position of the shaft. 2 ill., 1 tab. Yu

Description

four

00

with

The invention relates to the field of automation and computer technology and is intended to convert information about the angle of rotation of the shaft into a number of pulses.

The purpose of the invention is to increase reliability due to the use of phase comparison of two pulse sequences.

Fig, 1 shows a block diagram of the device; figure 2 - the times on the diagram of operation of the device.

The device contains the first 1 n second 2 phase switches, each consisting of inductive differential sensors 3 and 4 positions and resistors 5 and 6, respectively, the source 7 of an alternating sinusoidal voltage

At the same time, S23 Q17 + HB27 O 4- + 0 0 S24 QI8 + () 9 O + 1 Trigger 23 overturns to state Q23, in this case 024 0; R19 0; R18 0; u Potentials at the outputs of the triggers O; Q19 0; Qi8-0; KE27 Q19 1; S23 Q17 HE27 O +; S24

10 Q18 + 019 O - O O, Trigger 24 overturns into Q24 O state. Thus, the following device mode is set: Q23 Q24 1; Q17 0: Q19 0; Q18 - Oh, i.e.

15 device accepts initial

state 1 (table)

g. Thus, the element NOT 27 implements the function of inverting the phase of the output voltage of the trigger 19

shapers 8 and 9 of sequential-20 form a stress of .019. It is tender

rectangular pulses, each containing transistors 10 and 11 and resistors 12-15, respectively, the discriminator 16 pulsesWe which consists of triggers 17-19, 25 encoder 20, elements And 21 and 22, triggers 23 and 24, elements OR 25 and 26, the element is NOT 27.

The device works as follows.

Depending on the potentials of the voltage applied to the inputs of the decoder 20J on its outputs, signals appear in accordance with the table.

thirty

It is necessary for the case if during the initial switching on or as a result of a failure, the R and S inputs of the flip-flop 19 simultaneously receive two zero signals, which form - 019 1 ,, which in some states of the flip-flops 17 and 18 can lead to a loss of device performance.

Suppose a different initial state; Qi7 0 | Q19 0; Q18 1. At the same time XI 0; X2 0; HZ 1; Y1 Y4 1; the inputs R and S of the flip-flops 23 and 24 potentials are 1, taking into account the analysis, the potentials Q23 1, 024 1, At the outputs of the elements And 2 and 22 the potentials are also 1 o

If during the initial state one or both of the potentials at the outputs of the flip-flops 23 and 24 are equal to O, then as a result of this transient process the device enters the state Q23 1, Q24 1, and the triggers 17-19 take one of the states 3, 4.5 (table).

Let us examine, for example, one of the initial states.

Let with the inclusion of the scheme Q17-Q19 1, Q23 Q24 0 "

In this case, S23 Q17 + HE27 1 - S24 Q18 + Qi9 1 + 1 R23 R24 1.

According to the table, the VT output is open. decoderNU VI O, O ° -the action of potentials Q23, Q24, VI, equal to O, R17 O, R18 O, R19 O, 519 O.

Due to the action of these potentials, the triggers 17-19 are set in the state Qi7 O; Q19 1; Q19 1; Q18 0; HR27 0.

In this case, S23 Q17 + HB27 O 4- + 0 0 S24 QI8 + () 9 O + 1. Trigger 23 overturns into state Q23, in this case 024 0; R19 0; R18 0; u Potentials at the outputs of the triggers O; Q19 0; Qi8-0; KE27 Q19 1; S23 Q17 HE27 O +; S24

0 Q18 + 019 O - O O, Trigger 24 overturns into Q24 O state. Thus, the following device mode is set: Q23 Q24 1; Q17 0: Q19 0; Q18 - Oh, i.e.

5 device accepts initial

state 1 (table)

. Thus, the element NOT 27 implements the function of inverting the phase of the output voltage of the trigger 19

0 forms a stress of .019. This is not 5

0

five

0

0

five

It is necessary for the case when during initial switching on or as a result of a failure at inputs R and S of flip-flop 19 simultaneously two zero signals are received, forming - 019 1 ,, which in some states of flip-flops 17 and 18 may lead to loss of device performance.

Suppose a different initial state; Qi7 0 | Q19 0; Q18 1. At the same time XI 0; X2 0; HZ 1; Y1 Y4 1; the inputs R and S of the flip-flops 23 and 24 potentials are 1, taking into account the analysis, the potentials Q23 1, 024 1, At the outputs of the elements And 2 and 22 the potentials are also 1 o

With the arrival of the first impulse U (diagrams, Fig. 2), the trigger 18 overturns to the state Q18 0. According to the table at X О, Х2 О, ХЗ О, У1 - У4 1 "At the same time, S24 O confirms the state Q24 1 .

With the arrival of the second pulse U ((the trigger 17 tilts to a state. K When X, X2 O, X3 O, at the output Y4, a notional is formed corresponding to 0. At the same time, a signal with the potential O is output to the input R of the trigger 23, the trigger 23 generates the potential Q23 0. After a period of time determined by the constant time of the trigger 19, the latter overturns into the state Q19 1. At the outputs of the decoder XI 1, X2 1, X3 O, on the outputs Y1 - Y4, on the outputs of the Gerov 23 and 24 R23 R24 S23 S24

3

 1, triggers 23 and 24 remain in state 1 on outputs 0. Through time interval trj,), defined by the time constants of the And 21 element and the trigger 17, the trigger 17. overturns to the state O, On the inputs of the decoder XI 0, X2 1, X3 O, on the outputs Y1 - Y4. By the input S of the flip-flop 23 S23 QI7 + QI9 O +, the flip-flop 23 is tilted to the state Q23 1.

Thus, the OR element 25 and the trigger 23 perform a functional delay of the state O on the input R of the trigger 17 and the input S of the trigger 19 until the trigger J7 is set to the state Q17O and the trigger 19 is set to the state Q19 1 Only after the switching of both triggers, the signals from their outputs transfer trigger 23 to the state Q23 1 and remove the control signal with the potential O from inputs R17 and S19 of the triggers 17 and 19. The input potential S of the trigger 24 S24 Q18 + QI9 O 1 1, trigger 24 remains

in the state of Q24 1. The potential for

the input S of the flip-flop 23 S23 Q17 + Q19, the flip-flop 23 remains in the state Q23 1.

With the arrival of the third pulse, the trigger 18 remains in the same Q18O state, the states of the remaining elements also do not change.

With the arrival of the fourth pulse U (ui / trigger 17 tilts to the state Q17 1, At XI 1, X2 1, X3 O at the output of the decoders U1 - Y4 1. At the input S of the trigger 23 S23 Q17 + OT9 1, the potential at the output Q of the trigger 23 equals 1.

With the arrival of the advanced pulse UK.I, at the output D of the trigger 17, the potential is equal to O, the trigger 17 is flipped to the state 017 0. At XI 0, X2 1, X3 O, the potentials at the outputs of the decoder Y1 - Y4 I, S23 O , at output O of trigger 23, potential Q23 I is confirmed.

With the arrival of the sixth pulse UKIO at the input D of the flip-flop 18, the potential is equal to 1, the flip-flop 18 is tilted to the state Q18 I, S24 1.

At XI O, X2 1, XZ 1, the output of the ultrasonic decoder, UZ 0, is opened. The trigger 24 is tilted to the state Q24 O. After a time interval defined by the constant time

er - w

15 p 20 s -25

thirty

. 35

40

45 - 50

55 -

439739

no

Q18 O.

 P, X2 Y1 - Y4 R24

trigger 19, trigger 19 overturns to QI9 0 state. On the inputs of the decoder XI O, X2 O, IK I, on outputs U1 - Y4 1. On the inputs of the TP trigger 24 R24 1, S24 1, trigger 24 remains in the state Q24 0 After a period of time + + 52, determined by the time constants of the trigger 18 and the element 22, the trigger 18 is tilted to the state, According to the inputs of the decoder X1 O, X. O, on the outputs I, on the inputs of the trigger 24, S24 Q18 + qi9 O + O, trigger 24 tilts to state Q24 1.

Thus, the trigger 24 and the OR element 26 perform the functional delay of the state O at the inputs R of the flip-flops 18 and 19 until the flip-flops 18 and 19 are set to the state O by the outputs Q. Only after the switching of both triggers the signals from their outputs transfer trigger 24 to state Q24, 1. Potential S23 Q17 + Q19, trigger 23 remains in the state Q23 1, Potential S24 Q18 + Q19 O + O 0.

With the arrival of the seventh pulse, the potential at the input D of the trigger 17 is equal to O, the trigger 17 remains in the state Q17 O, the potentials at the outputs of the remaining elements remain the same.

With the arrival of the eighth pulse, the trigger 18 is transferred to the state Q18 1, the outputs of the decoder XI O, X2 O, X3 1, the outputs U1 - Y4 1. Potential S24 Q18 + + Q19 1 + O 1, trigger 24 remains in the state Q24 one.

And so until the 24th pulse, the potentials at the outputs of the triggers remain unchanged, because the phase relations at the outputs of the circuits of the square pulse shapers do not change.

With the arrival of the 25th pulse, the trigger 18 tilts to the state Q18 0. At the same time, the inputs of the decoder XI - X3 O, the outputs U1 - Y4 1, S24 QI8 + Q19 O + +, the trigger 24 remains in the state Q24 1.

With the arrival of the 26th pulse U (the trigger 17 is tilted to the state Q17 1. At XI 1, X2 O, X3 O, the output Y4 of the decoder opens.

5 ..... 1

The situation is repeated, the same after the arrival of the second pulse. which ends with Q17 0; Q18 O; S24 1; S23 0; Q23 Q24 1.

And so until the 44th pulse, the potentials at the outputs of the tritters remain unchanged, because the phase relations at the output of the circuits of the formers of the rectangular pulses do not change.

With the arrival of a pulse, the UK-K trigger 17 overturns in the state Q17 0. At XI O, X2 1, X3 O at the outputs of the decoder Y - Y4 1.

With the arrival of the 46th UMO pulse, the trigger 18 overturns in the state of Q18 1. At XI O, X2 1, X3 1, the output of the ultrasonic decoder UZ 0 opens, the situation is repeated, similar to after the sixth pulse Uj (.jO, which ends mi Q17 0; Q19 O; Q18 O; S23 "1; S24 0; q23 Q24 1,

With the arrival of the pulse, the UK flip-flop 17 remains in state Q17 "O, the potentials of the remaining elements of the circuit also remain the same.

With the arrival of the 48th pulse, the trigger 18 overturns to the state Q18 I. At XI O, XI O, X3 1, at the outputs of the decoder Y1 - Y4 1, S24 Q18 + Q19, the trigger 24 remains in the state Q24 1.

-

And so until the 54th pulse, the potentials at the outputs of the triggers remain unchanged, because the phase relations at the outputs of the schemes for the formation of rectangular pulses do not change.

Plot analysis (Fig. 2) shows that switching of the output trigger 19 is carried out after replacing the relative position of the pulses Uhio and U (, no later than one period of the high-frequency sinusoidal voltage U5 that the phase shifters are powered by.

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about

five

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five

0

five

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rmula of invention

A device for determining the angular position of the shaft, containing the first and second phase shifters, the inputs of which are connected to a source of alternating sinusoidal voltage, and the outputs to the inputs of the first and second formers of sequences of rectangular pulses, respectively, characterized in that, in order to increase reliability, first to fifth triggers, a decoder, two AND elements and two OR elements, a NOT element, the output of the first generator of a series of rectangular pulses are connected to the D-INPUT of the first trigger and C-input of the second trigger, the output of the second generator of a sequence of rectangular pulses connected to the C-input of the first trigger and the D-input of the second trigger, the output of which is connected to the first input of the first element OR and the first input of the decoder, the second input of which is connected to the output of the third trigger and through the element NOT to the first input of the second OR element and to the second input of the first OR element, the output of which is connected to the S-input of the fourth trigger whose output is connected to the first input of the first element AND and with R-BXO- the third trigger house, the output of the first trigger is connected to the third input of the decoder and to the second input of the second OR element, the output of which is connected to the S-INPUT of the fifth trigger, whose output is connected to the S-input of the third trigger and to the first input The second element And, the second input of which is connected to the second input of the first element And and to the first output of the decoder, the second output of which is connected to the third inputs of the first and second elements And, the output of the second element And is connected to the R input of the first trigger, the output of the first element And soy The dinene with the R input of the second trigger, the third and fourth outputs of the decoder are connected to the R inputs of the fourth and fifth triggers, respectively.

"Lit

T & I

Editor L.Gratillo

Order 6089/56

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. A / 5

Compiled by M.Sidorova

Tehred M. Morgental Proofreader S. Cherni

Circulation 929

Subscription

Claims (1)

SUMMARY OF THE INVENTION A device for determining the angular position of a shaft, comprising first and second phase shifters, the inputs of which are connected to a source of alternating sinusoidal voltage, and the outputs to the inputs of the first and second shaper of sequences of rectangular pulses, respectively, characterized in that, in order to increase reliability, they are introduced first to fifth triggers, decoder, two AND elements and two OR elements, NOT element, the output of the first square-wave pulse former is connected with the D-input of the first trigger and the C-input of the second trigger, the output of the second driver of the sequence of rectangular pulses is connected to the C-input of the first trigger and the D-input of the second trigger, the output of which is connected to the first input of the first OR element and to the first input of the decoder, the second input of which is connected to the output of the third trigger and through the element NOT to the first input of the second OR element and to the second input of the first OR element, the output of which is connected to the S-input of the fourth trigger, the output of which is connected to the first input of the first AND element with the R-input of the third trigger, the output of the first trigger is connected to the third input of the decoder and to the second input of the second OR element, the output of which is connected to the S-input of the fifth trigger, the output of which is connected to the S-input of the third trigger and the first input the second element And, the second input of which is connected to the second input of the first element And and to the first output of the decoder, the second output of which is connected to the third inputs of the first and second elements And, the output of the second element And is connected to the R-input of the first trigger, the output of the first element And is connected to the R-input of the second trigger, the third and fourth outputs of the decoder are connected to the R-inputs of the fourth and fifth triggers, respectively. condition Input Potentials Output potentials Xi X2 HZ U1 U2 KM U4 I 439739 Figure 1