SU945879A1 - Shaft angular position to code converter - Google Patents

Description

one

The invention relates to automation and computing and can be used to connect analog sources of information with a digital computing device.

The shaft angle converter is converted into a code containing a reference frequency generator, the output of which is connected to the input of the first pulse counter, a pulse width multiphase voltage generator and a multiphase phase shifter, a second pulse counter, differentiating and subtracting units, and a multiphase pulse shaper, whose outputs are connected to the corresponding inputs a differentiating unit whose output is connected to the first input of the second pulse counter, the outputs of the first and second pulse counters, and multiphase shaper “pulses are connected to the corresponding inputs of the subtraction unit, the output of the gene is;

A reference frequency rator is connected to the input of a second pulse counter, the output of the first pulse counter is connected to the input of a pulse width multiphase voltage generator 1.

The disadvantage of 1 converter is the complexity of the electronic part and the low allowable rotation speeds.

The closest technical solution to the invention is a shaft rotation angle converter into a code containing a multi-phase power source connected to a phase shifter and through the first limiter to one inputs of the switch, the outputs of the phase shifter through the second limiter are connected to other inputs of the subtractor, the outputs of the subtractor are connected to the pulse former coarse Calculation 12.

The disadvantage of such a converter is low accuracy, since it only generates coarse reference code pulses. 39 The purpose of the invention is to improve the accuracy of the converter. The goal is achieved by the fact that in the converter containing a multiphase power source connected to the phase shifter and through the first limiter to one subtractor inputs, the outputs of the phase shifter through the second limiter are connected to other inputs of the subtractor, the subtractor outputs are connected to the coarse former of the pulse generator, an additional subtractor is inserted, some of the inputs are connected to the subtractor's outputs, and the other inputs are from the output of the coarse-count pulse former and the output to the analog output of the lower ones converter bits The drawing shows a block diagram of a converter. The primary windings of the phase shifter 1 are connected to the multi-phase power supply 2 and the inputs of the first limiter Z. The output windings of the phase shifter

with b4bi2afjVbi b2, ajV bxjbja Vb jbij afiVbtjbjag; Cf, afjiVb b (a3Vb (, V (((ib3ax, Cj bxib (Vbri b aQ Vb-ib2 a3Vb b (Vb (, arj Shaper 6 coarse counting pulses consists of two-input V c

3 V4

. CAC,

; rS4

H v 5

II GK -

and triggers.

The second subtractor 7 is performed similarly to the first subtractor 5 for

1 q 3diVs ,,

The operation of the device will be considered with a uniform rotation of the input shaft of the converter with a constant angular velocity.

At the angular position of the rotor of the phase shifter 1, when the three-phase signals A and B coincide I1, therefore, the change of digital signals at the output of the limiters 3 and 4 occurs synchronously, their difference on the output buses of the subtractor 5 corresponds to the digit O. When the angle dL of the phase shifter changes from O to - Occurrence of the subtractor 5 digital signals O and 1 occurs periodically on the output buses.

elements, which form signals on the output buses, respectively.

about v 5

About v 1

S7.sz; 1 v 2

s., s 2 ,,

one phase and its logical expression is represented by the following relationship:

Moreover, when approaching the angle d to the value. The appearance time at the output of the subtractor 5, figures 1, is increased, and the numbers O are reduced. At the angle oL, the difference between the digital signals A and B corresponds to the number 1. With further rotor rotation

a phase shifter 1 from d to oC, a periodic occurrence occurs on the output bus of the emitter of 5 digital signals 1 and 2. Moreover, nj

W approximation of the rotor to the value of d,

3

Claims (1)

the occurrence of the digit 2 increases, and the digit 1 decreases. At the angular position of the rotor ct, the difference between the signals A and B corresponds to 9 liters 1 connected to the inputs of the second oi-limiter 4. The outputs of the stops 3 and connected to the inputs of the subtractor 5, the outputs of which are connected to the inputs of the former 6 of the coarse pulses and the first inputs of the subtractor 7. The second inputs of the subtractor 7 are connected to the outputs of the former 6. The output of the subtractor 7 is the analog output of the lower bits of the converter. Limiters 3 and convert the sinusoidal signals into square signals of a three-phase code, respectively, A and B. During the period of the frequency of the supply voltage, the three-phase signals A can be assigned six digits of a normal digital code. The same numbers can be assigned to the three-phase signal B. The execution of the subtractor 5 can be represented by the following logical expressions: the number 2, etc. In accordance with the change of digital signals C A - B, for a full rotation of the converter shaft K signals, one RS-trigger of driver 6 is set to position 1, and signals K / - to position O. Similarly, the other two switches of form 6 are switched from Signals K, K, K, K. For a full rotation of the shaft, the signals of the three-phase code D on the output tires of the former 6 encode six digits from O to 5. The difference between the signals C and D, which is formed at the output of the subtractor 7, corresponds to the numbers O and 1, where, when approaching the angle ot f,, L, -,, 2 Jf output time is subtracted. -. The 7 digits increase and decrease. At this digit, the presence of voltage on the output bus of the subtractor 7 corresponds, and the digit O indicates the absence of this voltage. Consequently, an analogue PWM signal is formed at the output of the subtractor 7, KOTopbw corresponds to the lower converter bits. Thus, the proposed clause (in addition to the coarse digital code, the generator generates an analog signal corresponding to the converter's lower bits. The economic effect of using the invention is determined by its technical advantage. Claims of the angle of rotation of the shaft into a code containing an mT1-phase power source connected to the phase shifter and through the first limiter to one inputs of the subtractor, the outputs of the phase shifter through the second limiter are connected to other inputs of the YOU reader, The outputs of the reader are connected to a coarse-pulse former, characterized in that, in order to increase the converter’s consistency, an additional subtractor is introduced into it, some inputs of which are connected to the subtractor’s outputs, and other inputs to the outputs of the coarse pulse former, and the output to analog the output of the younger bits of the Converter., Sources of information taken into account in the examination 1. USSR author's certificate № 8kQS3 (, cl. (, 08 C 9/0, 19792. USSR Copyright Certificate for Application No. 299b278 / 2-07, class Q 08 C 9/00, 1980 (prototype).