SU479136A1 - Angle Code Transducer - Google Patents

Description

central-central and radial-non-central rasters provide in conjunction moire patterns, and the parameters of the radial-central pattern can be chosen such that the pitch of the moire strips will be equal to the width of the raster ring.

On the fixed disk 5 against the track 9 of the disk 4 there are four raster tracks 8 (Fig. 3), offset from each other by a quarter of a step and having a width four times smaller. As a result, raster tracks 9 and 8 form four curtain mates between each other.

On a fixed disk 6 against tracks 8-I, sensitive surfaces are applied {FIG. 4) photodetectors 7.

The outputs of the photodetectors 7 accurate, intermediate and coarse samples (Fig. 5) through the outputs of the switch 12, consisting of keys 13 and the pulse distributor 14, are connected to the inputs of the keys 15. The control input of the switch 12 (input of the pulse distributor 14) through a pulse counter 16 connected to the output of the frequency divider 17 and the input of the phase splitter 18, the outputs of which are connected to the control inputs of the keys 15. The outputs of the keys 15 are connected via a serially connected summing amplifier 19, the integrator 20, the null organ 21 is connected to the input of the control unit 22 reading, to the other inputs of which is connected the output of register 23, the output of the generator 24 counting pulses connected to the input of frequency divider 17, and the outputs of the multi-input circuits "And 25 and 26 connected to the outputs of the bits of the pulse counter 16. The outputs of the read control block 22 are connected to shifting the input of the register 23 and the circuits And 27, to the other inputs of which are connected the outputs of the bits of the frequency divider 17, and the outputs of the circuits And 27 are connected to the inputs of the bits of the register 23.

Angle converter - the code works as follows.

The radiation source using the lamp 1 and the focusing system 2 evenly illuminates the disk 4. The light fluxes that pass through the raster tracks of the disks 4 and 5 of the interfaces 3 fall on the sensitive surfaces of the photodetectors 7. When the disk 4 rotates, the light streams are modulated according to a law close to sinusoidal , as a function of the angle of rotation of the Voltage Uf ;, taken from the outputs of the photodetectors 7 (where tl, 2, 3, 4) are shifted relative to each other in phase by a quarter of the period:

 Ф t фо + фмз1п (and у, h - X

X (,

2l

2.-T

2, -; ;:; tg

accordingly

conversion range of coarse, intermediate, and accurate samples;

 - zero signal value;

FM - the maximum value of the signal.

From the outputs of the photoreceivers 7, the signals arrive at the inputs of the keys 13 of the switch 12. The control inputs of the keys 13 receive pulses from the first, second and third outputs of the pulse distributor 14, respectively, to the input of which pulses of frequency l + t are fed (where gay are counting pulses taken from the generator 24 counting pulses) from the output of the discharge pulse counter 16 connected through the p-bit

frequency divider 17 with generator 24 counting pulses.

Voltage pulses are applied to the control inputs of the keys 15 from the outputs of the phase splitter 18

2

0-1),

/ fr; Hm a) / 4 where

2nfrcH.

2 "

;, „With) () n,

P (r |;): O with ()) (2nd + 2);

). t1) with / +

The frequency of the pulses fed to the input of the pulse distributor 14 is 2 times less than the frequency of the pulses f / fr- from the outputs of the phase splitter 18.

When the first pulse arrives at the input of the pulse distributor 14, it is set to the first position. From the first output of the pulse distributor 14, the enable signal is sent to the control inputs of the precision key switches 13 during the first cycle of the converter, and the inhibiting signals are sent from the second and third outputs of the pulse distributor 14. To the entrances

keys 15 at the time of the first cycle of the pulse distributor 14 are connected to the photodetectors 7 accurate reference. The voltages from the outputs of the photodetectors 7 with the help of keys 15 are periodically connected with a frequency

/ gay

  to the 1st input of the summing amplifier

19. Further, these voltages are summed, amplified and fed to the integrator input.

20. With the output of the latter, the signal arrives at the null organ 21. At the time the voltage of the integrator 20 passes through the zero, the null organ produces a pulse arriving at the input of the read control block 22.

In the steady state mode, the time interval between the zero state of the frequency divider 17 and the moment of appearance of a pulse at the output of the null organ 21 is proportional to the angle of rotation of the input shaft CWH

The pulse from the output of the null organ 21, when the enabling signals from the generator outputs 24 counting pulses and the multi-input circuit "And 25" opens, opens the circuit "And 27, and the bits of frequency divider 17 are currently registered in register 23. To avoid recording false codes, the read pulse is synchronized in the read control block 22 with pulses from the output of the counting pulse generator and the AND 25 multi-input circuit.

The pulses from the generator output 24 of the counting pulses to the circuit “AND 27 are delayed by transients in the frequency divider 17, and the pulse from the output of the multi-input circuit“ AND 25 occurs at the end of the operation cycle of the switch 12.

Thus, reading the result of the conversion and writing it to the register 23 occurs once per clock, at the end of the cycle of operation of the pulse distributor 14 (switch 12).

At the beginning of the next clock cycle of the switch 12, the signal from the output of the multi-input circuit "AND 26" and from the generator output 24 of the counting pulses of the read control unit 22 shifts the code stored in register 23 by n bits, freeing up in register 23 the space for the intermediate reading code which will be obtained in the second conversion cycle.

When the second pulse arrives at the input of the switch 12, the latter is set to the second position; The inputs of the keys 15 are connected to the outputs of intermediate-count photodetectors 7, and the conversion process is repeated as in the first cycle.

The impulse from the output of the null organ 21 is fed to the input of the read control block 22, where it is shifted, as in the first cycle of the converter, however, at the same time, the control input of the read control block from the 2 pin is register bit 23 to matching the exact and intermediate sample codes, a matching signal is given.

If the code value in the higher order is "O", then the pulse from the output of the null organ 21 without delay arrives at the inputs of the circuits "AND 27, or is delayed by the time of the half pulse period from the generator 24

counting pulses, if the value of the code in the highest bit is equal to "I. The other input of the read control unit receives an enable signal from the AND 25 circuit. The pulses of the AND 27 circuits and the frequency divider code 17 are written to register 23.

Similarly, the converter works in the last, third cycle of operation. At the beginning of the clock, the code in register 23 is shifted by n clock cycles, and the code is issued at the beginning of the first clock of the circuit. Thus, the read control unit 22 controls and writes the codes to the register 23 so that the n-bit exact code is written in the first clock, then it is shifted by n clock cycles, the intermediate clock is written in the second clock, which is shifted by n ticks together with a previously recorded exact reference code, a rough reference code is recorded in the third tick, and then the summary code is output to the output of the angle-to-converter.

Subject invention

Angle-code converter containing a series-connected counting pulse generator, a frequency divider, a phase splitter, keys, a summing amplifier, an integrator, a zero-body, a read control unit connected to the inputs of the AND circuits, the register and the counting pulse generator, and the outputs of the frequency splitter bits through the "And connected to the inputs of the bits of the register,

coarse, intermediate and accurate photodetectors installed opposite corresponding raster interfaces, fixed and movable disks and radiation source, characterized in that, in order to simplify the converter, a switch, a pulse counter and multi-input circuits are introduced into it, and the photodetector outputs through the switch is connected to other inputs of the keys, the control input of the switch through the pulse counter is connected to the output of the frequency divider, and the outputs of the bits of the pulse counter through the input cs we "and are connected to the inputs of the read control unit.

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cpns. J

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FIG. five