SU746655A1 - Shaft angular position-to-code converter - Google Patents

Description

(54) SHAFT ANGLE CONVERTER

IN CODE

The invention relates to the field of automation and computer technology and can be used to lubricate analog information sources with a digital computing device. . . Angle converters are known; the gate of a wap to a code contains an inductive parametric angle sensor, the outputs of which are connected to the outputs of direct current sources and connected to the inputs of an integrated phase meter, which averages the next more instantaneous values of phase shifts per revolution of the parametric sensor modulator angle and conversion of the average value of the phase shift to the ij code. The disadvantage of such a converter is the error caused by the temperature and temporal instability of the DC sources and the integrating phase meter. A converter is also known that contains an angle sensor connected via a switch to a digital phase meter. In such a transducer, before starting measurements when the input shaft is stationary, a 1 correction is determined, which corresponds to the error introduced by the digital phase meter, the angle is determined as the sum of the measured value and the correction value 2, The transducer has a disadvantage; Name of additional measurements and calculations. In addition, a transducer is characteristic of such a converter, associated with a change in its parameters during operation. The closest technical solution to the invention is a shaft rotation angle converter into a code containing an inductive parametric angle sensor, two DC sources connected to the inputs of the comparators, a unitary code generation unit (BFUK}, one output of which is connected to the installation input to zero reversible counter, and the output of the bits of the reverse counter is connected to BFUK Z. BFUK generates a sequence of packs of pulses. The number of pulses in each pack is proportional to the instantaneous value of the angle of rotation A. The number of bursts corresponding to one measurement cycle is determined by

counting packs included in BFUK.,

A disadvantage of the known converter is the error caused by the temperature and time instability of the sources of DC current and comparators.

The aim of the invention is to improve the accuracy of the converter.

The goal is achieved by the fact that two are entered into the Proposed shaft rotation angle converter in the code. switch, descrambler, element NOT, Four elements AND and trigger. (The second BFUK output is connected to the decoder loop, the output of which is connected to one input of the first and second elements AND, and through the element NOT to one input of the third and fourth elements AND, the other inputs of which are connected respectively to the third and fourth outputs; the BCFC, and the outputs are connected to counting inputs of the reversible counter. The other inputs of the first and second elements I are connected respectively to the fifth and sixth outputs of the BCFC, and the outputs are connected to the trigger inputs, the outputs of which are connected to the control inputs of the switches. inputs of the first switch connected to the induction vyhbdam parametric angle sensor and vyhodda to the inputs of the comparator inputs of the second switch connected to the output of the comparator, and outputs -. BTOjJOMy to BFUK and third inputs.

The structure diagram of the yrJiU converter for turning the hall into a code is presented in the Drawing.

The converter contains an inductive parametric angle sensor 1 connected to switch 2, the outputs of which are connected to the outputs of sources 3 and 4 of direct current and connected via comparators 5 and 6 to switch 7. The inputs of switch 7 are connected to the inputs of the BCFC, one output of which is connected to the input setting the reversible counter 9 to zero, the second output - to the input of the decoder 10, the output of which is connected to the same inputs of the elements 11 and 12 and through the element .13 NOT to the elements 14 and 15. The outputs of the elements 11 and 12 are connected to the trigger inputs 16, the outputs of which are connected to control inputs; switches 2 and 7. The outputs of the MeiwoB And 14 and 15 are connected to the input of the Addition and subtraction of counter 9.

BFUK 8 contains elements And 17 and 18 / connected to single inputs of flip-flops 19 and 20, single outputs of which are connected to the inputs of And 14 and 15 through elements 21 and 22 of the second inputs of elements 21 and .22; Connections to the zero inputs of the trigger 19 and 20, and the third inputs - to the output of the generator 23 pulses. Source 24 of the Start command is connected

to the single inputs of the triggers 25 and 26. The output of the trigger 25 is connected to the element And 27, the other input of which is connected via the decoder 28 to the output of the counter E, and the output of the element 27 and 27 is connected to the zero inputs of the counter 9 and the triggers 19 and 20. The single outputs of the triggers 19 and 20 are connected to the element I 29, the output of which is connected to the zero inputs of the trigger

19, 20 and 25 and to the input of the counter 30, the pulse overflow output of which is connected to the zero input of the trigger 26. The potential outputs of the higher bit of the counter 30 are connected to elements 11 and 12, and the outputs of the bits of the counter 30 to the decoder 10. The converter is working in the following way.

When connecting the stator winding of sensor 1 through switch 2 to the input of comparator 5, and the rotor winding. sensor 1 to the input of the comparator 6 at the inputs of the comparators 5 and 6 sinusoidal signals are formed, the phase shift between which is proportional to

5 angle of rotation of the input shaft of the sensor 1. Comparators 5 and b form pulses when the input sinusoidal signals go through zero, for example, with a positive gradient.

Q The pulses of comparators 5 and 6 through the switch 7 are fed to the inputs of the elements AND 17 and 18 of the block 8. On the Start command from the source 24, the triggers 25 and 26 are set to

from state 1, and elements 17 and 18 open. After the Start command, the output pulse of switch 7 sets the corresponding of flip-flops 19 or 20 to state 1, one of the elements 21 opens.

0 or 22, and the pulses from the generator 23 through series-connected elements And 21 and 14 or through the elements And 22 and 15 are fed to the input of the addition or subtraction of the counter 9. The pulse from the other output of the switch 7 sets the other trigger 20 or 19 to state 1 The elements of And 21 and 22 are closed, and the counting of pulses on the counter 9 stops. With

This opens element 29 and sets the triggers 19/20 and 25 to the state O and skidding 1 to the counter 30. Upon the arrival of the next output pulse of the switch 7, the measurement cycle of the instantaneous angle value is repeated. The next pack and 1 pulses of the current angle reading are added to the counter 9 with the number of pulses of the previous samples.

When reaching a certain code

Claims (3)

0 on the counter 30, the decoder 10 is triggered, through element 13 it is NOT closing the elements 14 and 15 and setting the trigger 16 to another steady state. Switches 2 and 7 switch channels. The winding of the stator sensor 1 is connected to the input of the comparator 6, and the torus winding is connected to the input of the comparator 5. The output of the comparator 5 is connected to the input of the element 18 and the output of the comparator b to the input of the element 17. When the counter 30 reaches the full fault the code values of the decoder 10 is turned off, the elements of AND 14 and 15 are opened, and the next bursts of pulses corresponding to the current angle readings are inserted into the counter 9. The decoder 10 repeatedly responds half the time the counter 30 operates after the first response. Switches 2 and -7 return to the initial state the elements AND 14 and 15 are closed until the counter 30 overflows. Upon the overflow pulse of the counter 30, the trigger 26 is set to O, the elements 17 and 18 are closed, and the measurement cycle ends At the moment of the repeated operation of the decoder 10 in the counter 9, the average value of the rotation angle code during the measurement cycle is set. At the end of the previous pulse measurement cycle, the next measurement cycle starts. The duration of the measurement cycle is determined by the capacity of the counter 30, the number of rows of which is selected from the condition of providing the measurement cycle per revolution of the modulator sensor 1. During the switching time of switches 2 and 7 and the end of the transient processes associated with switching, two measurements are disconnected from the inputs of counter 9 from block 8. The switching moments of switches 2 and 7 are evenly spaced in the measurement cycle, which eliminates the influence of the error in the angular pitch of the modulator teeth. To eliminate the error during the transition: From the full phase of the output signals of sensor 1 during the averaging cycle, the decoder 28 and element 27 are designed. If the number of pulses in the first burst after the Start command exceeds half the maximum number of pulses in the burst, the decoder 28 and element And 27. Counter 9 and triggers 19 and 20 are set to state O. As a result, summation always starts with a burst of pulses less than half the maximum value of the number of pulses in a burst. After the first burst of pulses fixed in the counters 9 and 30, the trigger 25 is set to the state O and the element AND 27 closes. Introduction of two switches 2 and 7 of the decoder 10, element 13 NOT, elements 11, 12, 14, 15 and trigger 16 eliminates the influence of instability 5 of sources 3 and 4 of direct current and comparators 5 and 6 on the error of the converter. All other elements of the BFUK 8 and 1K 9 counters perform computational 1 and logical functions and do not introduce any errors in the measurement results. Thus, the proposed converter possesses higher accuracy characteristics as compared to conventional 1 × 1 converters of the same purpose. The economic effect of using the proposed converter is determined by its technical advantages. f The invention of the shaft angle converter into a code containing an inductive parametric angle sensor, two DC sources connected to the inputs of the comparators, a unitary code generation unit, one output of which is connected to the zero-setting input of a reversible counter, and an output of a reversible counter connected to the first input of the unitary code generation unit, distinguished by the fact that, in order to increase the accuracy of the converter, two switches, a decoder, a NOT element, and four re element I and trigger, the second output of the unit forming the unitary code is connected to the input of the decoder, the output of which is connected to one input of the first and second elements AND and through the element NOT to one input of the third and fourth elements AND, the other inputs of which are connected respectively to the third and fourth the outputs of the forkshry unit of the unitary code, and the outputs are connected to the counting inputs of the reversible counter, the other inputs of the first and second elements And are connected respectively to the fifth and sixth outputs of the unit for shaping unitary code, and the outputs are connected to the trigger inputs, the outputs of which are connected to the control inputs of the switches, the other inputs of the first switch are connected to the outputs of the inductive parametric angle, and the outputs are to the inputs of the comparator, the inputs of the second switch are connected to the outputs of the comparatives, and the outputs are connected to the second and the third inputs of the unitary code generation unit. Sources of information, rintye taken into account during the examination 1. USSR author's certificate 503268, cl. G 08 C 9/00, 1972. 2. Authors certificate USSR 455356, cl. G 08 C 9 / pO, 1972. 3. Authors certificate of the USSR 372682, cl. H 03 K 13/20, 11.08.71 (prototype).