SU1200419A1 - Shaft position-to-digital converter - Google Patents

Abstract

1. SHAFT ANGLE CONVERTER CODE containing an illuminator unit, optically connected through a code disk made with an additional S-track and higher and lower order tracks, and an indicator disk with a photodetector unit, the group of outputs of the higher bits of which is connected to the inputs of the first the code converter, and the group of low-order bits are connected to the inputs of the second code converter, the output of the high bit of which is connected to the input of the high bit of the sample matching block, the remaining inputs of which are Connected to the outputs of the first code converter, this is because, in order to increase the reliability of the converter, an additional 8-track is provided between the high and low bits of the code disk and connected to the additional input of the first code generator S, and the outputs A second code converter and an accord unit (L Sampling counts are transducer outputs.

Description

ABOUT

about

four

WITH

2. The converter according to claim 1, differing in that the block for matching the samples contains an element NOT, an EXCLUSIVE OR element and an adder, the input of the element is NOT an input of the higher bit of the block, the output of the element is NOT connected to the first input of the adder

and the first input of the EXCLUSIVE OR element are the remaining inputs of the block, all outputs of the adder except the last, and the output of the EXCLUSIVE OR element are the outputs of the block, the last output of the adder is connected to the second input of the EXCLUSIVE OR element.

The invention relates to the field of automation and is intended to measure the angular displacements of various objects.

The aim of the invention is to increase the reliability of the converter.

Fig. 1 shows a block diagram of a converter; in fig. 2 is a block diagram of the execution of the sample matching unit; Figs. 3 are timing charts explaining the operation of the sample matching unit when the shaft rotates clockwise; on fkg. 4 timing diagrams illustrating the operation of the sample matching unit when rotating counterclockwise.

The converter includes a housing 1, a shaft 2, a code disk 3, an indicator disk 4, a block of 5 illuminators, a block of 6 photodetectors, transducers 7 and 8 of the code, a block 9 of sample matching. which contains the adder 10, the elements NOT 11 and FASTENING OR 12,

The code picture of the disk 3 is digitized by the n-digit Gre code and consists of n cod tracks, with the q lower bits located on tracks with a large radius, and (n – q) older ones with a smaller radius,

In addition, the code picture of the disk 3 contains an additional 5 track, which is plotted between the tracks of the higher and lower bits and has a resolution that is half the discreteness of the track of the (n – q) th bit.

The outputs q lower bits of the block 6 photodetectors are connected to the lower bits of the converter 7 code. The outputs (n – q) of the high bits and the additional S-bit of block 6 are connected to the high bits of the converter of 8 code.

The converter works as follows.

Unit 5 generates a radiation flux illuminating that part of the code

disk 3, which is located against the slit diaphragms of disk 4. From the outputs of block 6, the signals are taken from the n-bit of the parallel parallel Gre code and the additional S-bit, which are fed to the 7 and 8 code converters. Moreover, the low-order bits from p to (n-q + l) -ro are fed to the code converter 7, and the high-order signals, starting from (n-q) -th - to

8 code converter, From the outputs of the 7 and 8 code converters, q and (n – q) -discharge codes are removed, the (n – q + l) -ro higher-order code of the higher code of the 7-code converter is doubled

less than (n-q) -th low-order bit of the converter 8 code and is equal to the discreteness of the S-ro additional bits. This is necessary to accomplish the operation of converting codes

of the drivers 7 and 8 of the code in block 9 of matching the samples, in which the specified bits are compared, In the case of a mismatch of codes of bits q and (n-q) in the adder 10 (FIG. 2)

a transfer signal is formed, equal in duration to the mismatch of the group (n-q) of the upper bits of the converter 8 and the group of the lower bits of the converter 7. The shift of each of the higher bits of the converter 8 is produced by an amount equal to the length of the error signal. The shift is carried out sequentially from (n-q) -th to the 1st

(senior) bit, In the result, at the output of the converter, an n-bit parallel binary 1st code is formed, the q lower bits of which 3 is the decoder code for converter 7, and the (nq) most significant bits are the corrected output code of the old bit Converter 8 converters. By changing the direction of rotation of shaft 2 of the converter, there is a simultaneous phase shift of 180 smaller bits q, higher bits (nq), and a transfer signal, which does not change the algorithm of operation of unit 9 co-operation. Block 9 approval of the readings works as follows. From the exit; Converter 7 of the code receives signals from p to (n – q + 1) bits. The (n – q + 2) -ro bit signals are shown in FIG. Over. The highest bit (n-q + l) (Fig. 38 goes to block 9. After inverting, this signal is fed to one of the low-end inputs of the adder 10, to the second input of which the conversion signal of the additional S-bit is applied ( Fig. 3 &). With the cymp QI (n-q + l) and S-bits, in the lower bits of the adder 194 10 a transfer signal is formed (Fig. 3g), which, in turn, is summed with (nq) -M the bit of block 8 (Fig. Zch. The signal of this sum forms the corrected (nq) -th bit (fig. Ze), summed up with the corrected (nq) -M bit, forms the second The transfer signal (Fig. with a pulse duration equal to d. and a follow-up period is two times less than the period (n-q + 1) -discharge. When the second transfer signal and the (nql) -ro bit signal (4ig. 3) are summed corrected (nqI) -th bit (Fig. 3u); Similarly, the matching of the counts of the subsequent bits from (nq-2) -ro to the 1st bit occurs. counterclockwise, shown in FIG. 4. The operation algorithm is similar to the operation of unit 9 when the shaft 2 is rotated clockwise.

Fig.Ch

Claims (2)

1. A SHAFT ANGLE CONVERTER TO A CODE, comprising an illuminator block optically connected through a code disk made with an additional S-track and high and low order tracks, and an indicator disk with a photodetector block, the group of high-order outputs of which is connected to the inputs of the first code converter, and the group of low-order outputs with the inputs of the second code converter, the output of the highest bit of which is connected to the input of the highest bit of the block matching samples, the remaining inputs of which are connected s with the outputs of the first code converter, characterized in that, in order to increase the reliability of the converter, an additional S-track is made between the tracks of the upper and lower bits of the code disk and connected to the additional input of the first code converter, and the outputs of the second code converter and block coordination of samples are the outputs of the Converter. > 2. The converter according to π, 1, characterized in that the block for matching the samples contains the element? · Element NOT, the element EXCLUSIVE OR and the adder, the input of the element is NOT the input of the highest bit of the block, the output of the element is NOT connected to the first input of the adder, the remaining inputs of which and the first input of the EXCLUSIVE OR element is the remaining inputs of the block, all the outputs of the adder, except the last, and the output of the EXCLUSIVE OR element are the outputs of the block, the last output of the adder is connected to the second input of the EXCLUSIVE OR element.