SU1049947A2 - Shaft rotation angle encoder - Google Patents

Abstract

CONVERTER ANGLE OF TURNING SHAFT TO CODE by author. St. No. 734772, characterized in that, in order to expand the range of operation of the converter, an angle increment pulse generator and a reversible counter are introduced into it, one input of the angle increment pulse generator is connected to the output of the zero-organ, the other input to the output of the penultimate most significant bit of the conversion unit in the code, and the outputs - to the inputs of the addition and subtraction of a reversible counter. (L with CO NU: 3

Description

This invention relates to systems for the automatic control and regulation of non-electrical quantities.

On the main auth, sv. 734772 is known for converting a shaft rotation angle into a code comprising a potentiometer made with a circular continuous winding with three leads and two contact brushes connected to the shaft and connected to a reference voltage source and a voltage-to-voltage conversion unit connected to one potentiometer winding lead , the zero-organ and the inverter code, the first input of which is connected to the output of the voltage-to-voltage conversion unit, the other two windings of the potentiometer are connected to the inputs of the zero-organ, the output of which is connected to The second input of the inverter is l.

A disadvantage of the known converter is the small range of its operation, only within one revolution of the shaft.

The purpose of the invention is to expand the range of operation of the converter. The goal is achieved by introducing an incremental impulse shaper and a reversible counter into the shaft angle converter, one input of the incremental impulse shaper is connected to the output of the zero-organ, the other input to the output of the last-to-most high bit of the voltage conversion unit. a-outputs to the inputs of the addition and subtraction of a reversible counter.

FIG. 1 is a block diagram of a converter; in fig. 2 - diagram of the converter.

The shaft angle-to-turn converter contains a potentiometer 1 having a circular continuous winding with three taps at an angle of 120 ° and two sliding contact brushes 2 located on the same straight line and connected mechanically to the axis of rotation. The source 3 of the reference voltage is connected to the sliding brush brushes 2.

The first tap of potentiometer 1 is connected to the input of a voltage-to-code block 4, the second and third leads of potentiometer 1 are connected to the inputs of the zero-organ 5, the output of which is connected to the second input of code inverter 6, and the first input of code inverter 6 is connected to the output of the block 4 converts the voltage into the code, and the output with the output of the converter.

FIG. 1 shows the taps of the potentiometer 7-9, where one input of the imager 10 pulse increments of the angle is connected to the output of the zero-organ D), the other input to the output of the penultimate most significant bit of block 4, and the outputs of the imager 10 connected to the inputs of addition and subtraction of the reversible counter 11 .

The Converter operates as follows. ..

The translatable movement is counted from the first outlet 7 of the potentiometer 1 as the sliding contact brushes 2 move along the winding. The voltage removed from the first retraction is proportional to the angle of rotation of the sliding contact brushes 2 in dia. the range of angles from O to 180 °, - then in the range of. 180 to 360, this voltage monotonously decreases from maximum value to zero. The voltages taken from the second and third taps are changed in the same way, shifted 120 by the turning angle (Fig. 2a).

The voltage taken from the first outlet 7 of potentiometer 1 is converted to a proportional value; binary code using block 4 voltage conversion code, and the maximum voltage corresponds to half the maximum value of the code block 4.

At the same time, the comparison of voltages taken from the second 8 and TpieTbero 9 taps of potentiometer 1 takes place. at the point of zero-organ 5. In the range of angles of rotation of the sliding contact brushes, 2 from O to, the voltage taken from the second branch 8 is greater than the voltage taken from the third branch 9, which corresponds to the absence of a signal at the output of the null organ 5. As the angle of rotation increases above ISO, the voltage from the third branch 9 becomes greater than the voltage from the second branch 8, which corresponds to a change in the state of the null organ 5 and the appearance of a unit potential at its output (Fig. 26).

The signal from the output of the null organ 5 controls the inverter 6 of the code so that, in the absence of a potential at the output of the null organ 5, the inverter 6 does not change the code, and when the control potential is disconnected, the code removed from the output of block 4 is inverted. By inverting the codes, as the angle of rotation of the sliding brushes 2 increases above 180 °, the value taken at the output of the code converter increases, although the input voltage of the voltage conversion unit 4 decreases. In this case, the output characteristic becomes linear in the range of convertible angles from 0 to 360.

If the angle to be converted exceeds 36 °, the conversion cycle is repeated with the only difference that

the reversive counter 11 at each subsequent turn receives a summing pulse from one of the outputs. shaper 10a, in the case of a reverse rotation, which subtracts from the other output of shaper 10. In shaper 10, the output signals of the null organ 5 are differentiated and distributed among the outputs depending on the direction of rotation. The sequence of pulses corresponding to the fronts of the signal of the zero-organ 5 when the potentiometer 1 is rotated clockwise is represented by n.dig, 2d, and the clock is shown. in fig. 2d For the distribution of the pulses in the driver 10, control signals are used from the output of the higher-order prepro-sprinter 4. JUiarpaMMa sd

- The row of the conversion-voltage-to-code block 4 is shown in FIG. 2nd. The control signals inhibit or enable, the output pulses of the imaging unit 10, at one of the outputs of which there will be a sequence corresponding to the direct movement (Fig. 2g), on a circle (Fig. 2e), reversible.

10 The result of the conversion is digitally recorded on the reversible counter 11 (high bits) and on the inverter 6 codes (low bits). Reverse Counter Code

15 11 corresponds to the number of revolutions of the shaft from the beginning of the conversion. As a result, the range of the measured displacement in such a converter is expanded in comparison with the known one.

Claims (1)

THE CONVERTER OF THE ANGLE OF THE TURN OF THE SHAFT IN THE CODE by ed. St. No. 734772, which differs in that, in order to expand the range of operation of the converter, an angle increment pulse generator and a reverse counter are introduced into it, one input of the angle increment pulse generator is connected to the output of the zero-organ, the other input to the output of the penultimate senior discharge of the conversion unit voltage to the code, and the outputs to the inputs of addition and subtraction of the reverse counter. 1