SU1667250A1 - Shaft rotation angle-to-digit converter - Google Patents

Abstract

The invention relates to automation and can be used to measure the current value of the rotation angle of a rotating shaft with regard to a change in the direction of rotation. The aim of the invention is to improve the accuracy of the converter. To do this, the shaft angle converter into the code containing the photoelectric converter, two triggers, two OR elements, two pulse drivers, two AND elements, a reversible counter, three Exclusive OR elements, two pulse formers, the OR element, NOT, a reversible counter, and element of zeroing. The goal is achieved by obtaining four counting pulses in one period of a sequence of pulses coming from a photoelectric converter. 2 Il.

Description

Yo

The invention relates to automation and can be used to measure the current value of the rotation angle of a rotating shaft with regard to a change in the direction of motion.

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

Fig 1 shows the functional

The converter circuit in FIG. 2 (ao) time diagrams for his work

The converter of the angle of rotation of the shaft into the code contains a photoelectric converter 1 made in the form of a source 2 of light, a disk 3 with transparent and opaque areas of photodetectors 4, 5 and a shape of 6, 7 pulses, triggers 8, 9, elements EXCLUSIVE OR 10-12, pulse shaper, element zero zero, elements 18, 19,

OR elements 20. 21 reverse 22, element OR NOT 23.

Converter angle of rotation of the wool in the code works as follows.

When power is applied to the converter, element 17, through element I 19, gates the flip-flops 8 and 9, the outputs of which set the corresponding signals of the same level as that of the drivers 6 and 7. When the disk 3 rotates, the photodetectors 4 and 5 are illuminated through transparent portions and at the outputs of the formers 6 and 7, low potential signals appear that are phase-shifted by 1/4 period (Fig. 2, pos. a and b).

Suppose that the signal from the driver 7 is ahead by 1/4 period of the signal from the driver 6 In this case, the following occurs

ABOUT

oh vj you ate oh

At the output of element 10, a sequence of pulses (Fig. 2. Pos. C) appears with a frequency twice as large as with drivers 6 and 7, with switching times coinciding with both positive and negative fronts of the sequences of pulses from drivers 6 and 7. A rectangular signal from the output of element 10 is fed to the direct input of the imaging unit 13 and to the inverse input of the imaging unit 14. The imaging unit 13, 14 generates short pulses on the positive edges at their input. These short pulses from the inverted outputs of the formers 13, 14 (Fig. 2, pos. D) are fed to the inputs of the element 18. At the output of which (Fig. 2, pos. E) four short negative pulses are formed in one period. These pulses through the second element And 19 gates the triggers 8 and 9. At the same time, the outputs of the triggers 8 (Fig. 2, pos. G) and 9 (Fig. 2, Pz) with a time delay determined by the duration of short pulses, The same pulse train as shaper 6 and 7, but shifted by the magnitude of short pulses. which allows to determine the direction of rotation of the shaft at the moment of arrival of each short pulse coming from the output of the element AND 18 to the inputs of the element OR 20, 21 (Fig. 2, pos. l and m). The direction of rotation is determined as follows: elements 11 and 12 compare the signals from Shaper 6 and 7 and the outputs of the flip-flops 8 and 9. With a positive shaft rotation direction, the output of element 12 (Fig. 2) appears low level at the time of short impulses, and element 11 (Fig. 2, pos.) during the ego time receives high level signals. Therefore, short pulses through element 20 (Fig. 2, pos. L) pass to inverse input of the imager 15 pulses, and on the inverse input of the imager 16 n hundred continuously present high level signal (Fig. 2, pos. M).

When the direction of rotation of the shaft changes, the low level signal appears at the output of the element 11 at the moment of short impulses, and the high level signals are present at the output of the element 12. Short negative pulses pass to the inverse input of the ramifier 16 through the element OR 21 The counting pulses from the inverse outputs of the formers 15, 16 are fed to the direct and reverse inputs, respectively (. Of the reversible counter 22.

The element OR-NOT 23 serves to block the formers 15 and 16 at the time of reversing the shaft on the border of the transparent and opaque portions of the disk 3.

Claims (1)

The invention of the converter of the angle of rotation of the shaft in the code. containing a photoelectric converter made in the form of a light source optically connected through a disk with transparent and opaque areas with two photodetectors, whose outputs are connected to the inputs of the first and second pulse formers, the outputs of the first pulse shaper are connected to the first input of the first trigger, the second trigger, two elements OR, the third pulse shaper, the output of which is connected to the first input of the first element TU I. fourth pulse shaper, the second element And, reversible th counter, oh j and heme. that, in order to increase the accuracy of the converter, three elements EXCLUDING OR are introduced into it, 5th and sixth pulse formers, element OR-NOT, zeroing element, the output of the first pulse generator is connected to the first input of the first and second elements EXCLUSIVE OR, the output 0 of the second pulse shaper is connected to the first input of the second trigger, the second input of the first element EXCLUSIVE OR, and the first input of the third element EXCLUSIVE OR, 5 the output of the first element EXCLUSIVE OR is connected to the inputs of the third and fourth pulse formers, the output of the fourth pulse former is connected to the second input of the first element 0 ta And, the output of which is connected to the first round and sixth and one-second pulse formers, elements of the OR, and the second element I. The output of which is connected to the second inputs of the first and second triggers, 5 outputs of which are connected to the second inputs of the third and second elements, respectively, EXCLUSIVE OR. the outputs of which are connected to the second inputs of the first and second elements OR the outputs of the cokors are connected to the inputs of the OR-NOT element and the second inputs of the fifth and sixth pulse formers, the outputs of which are connected to the inputs of the reversible counter, the outputs of which are horizontally the outputs of the angle converter rotation of the shaft in the code, the output of the element OR is NOT connected to the third inputs of the element goiIL, the input of the zeroing element is connected to the power bus and the output to the second input of the second element AND about LO CN GtO Ј HIT U U 41PPLPLPPP Sj s rl 1G erLTLTLrU 51PPPPPG ten shppppppy - ;. a ITU einnnnnnnn JLJ L. L i g U. f. .Ppcppppg lshpppllg FIG. 2