SU600589A1 - Displacement -to-pulse train converter - Google Patents

Description

one

The invention relates to automation and computer technology and can be used in discrete control devices for the position or speed of an actuator, such as an industrial mechanism, when the movement must be represented as a sequence of pulses (unitary binary code).

Transmitters into pulse train 1 are known, which contain a multichannel displacement sensor with single-phase power supply, the outputs of which are connected to the signal inputs of phase-sensitive amplifiers, filters, threshold elements.

A disadvantage of the known transducers is their low accuracy due to the difficulty of accommodating a large number of windings (signal phases) of the stator and the rotor of the sensor.

The converter 2, which is closest to the technical essence of the invention, is also known. It contains a multichannel displacement sensor whose outputs are connected to the signal inputs of phase-sensitive amplifiers, the reference inputs connected to the outputs of the reference voltage source, and the unequalities of the outputs are connected to the OR element inputs.

Such a converter does not provide high accuracy due to the limited possibilities of sampling its channels. The purpose of the invention is to increase accuracy

converter

This is achieved by introducing amplitude selectors and additional unequal elements, the outputs of phase-sensitive amplifiers are connected to the signal inputs of amplitude selectors, the reference inputs of which are connected to the outputs of the reference voltage source, and the outputs of the amplitude selectors through filters to the corresponding inputs of additional equality elements, the outputs of which are connected in pairs to the inputs of the inequality elements.

FIG. Figure 1 shows the structural scheme of the proposed converter based on a two-channel displacement sensor (piduktosin) and a four-channel amplitude selector; in fig. 2 is a diagram of his work.

According to this principle, a structural scheme and diagram of work with any number of channels can be constructed.

The output of the excitation generator 1 is connected to the input of the multichannel displacement sensor 2 and through the source 3 of the reference voltage (for example, a transformer) with reference

inputs of phase-sensitive amplifiers 4 and amplitude selectors 5. The outputs of the source 6 of the reference voltage are the two ends of one winding b, therefore the reference signals from them are in antiphase. The signal inputs of phase-sensitive amplifiers 4 are connected to the inputs of channels (phases) 7 of a multichannel displacement sensor, and the outputs of phase-sensitive amplifiers 4 are connected to signal inputs of amplitude selectors 5, the outputs of which through filters 8 are connected in pairs to each of the additional elements 9 inequality. The outputs of the elements 9 are connected in pairs to the inputs of the elements 10 unequalities, the outputs of which are combined by the element OR I.

The signal windings that form the channels 7 of the multichannel displacement sensor 2 are spatially shifted by an amount corresponding to the spatial electrical voltage, 180 phase, where m is the number of channels amt

Miracle selector, in each group the same. The winding 12 of the excitation of a multi-channel displacement transducer is located on a movable part articulated with a controlled organ (not shown in Fig. 1).

The converter works as follows.

When tshdache high frequency voltage from the excitation generator 1 to the input of a multichannel sensor 2 moving the output pa it is induced by a mutual induction emf, iromodule: by moving the conductors of the excitation winding along the amplitude, with an alternating electrical phase over a period of time corresponding to the movement of the conductors of the winding 12 excitation of a multichannel displacement sensor by the magnitude of the pole division

half step t between the poles. On

The output of phase-sensitive amplifiers 4 at the moments of coincidence of the characters of the phases of the reference voltage of source 3 and the voltage on the signal inputs of the phase-sensitive amplifiers (see diagram in Fig. 2) t / i and Uz signals are repeated, repeating in form the voltage windings of the multichannel sensor displacements that coincide in phase with the reference voltage. The voltages L / i and Uz are shifted 1p to the spatial

.. JSC I 180

phase at 1.80 +.

t

These voltages are fed to the signal inputs of the amplitude selectors 5, where the values of the amplitudes of the voltages Ui and Uz are compared with the values of the reference voltage from the output of source 3 and, depending on their current value, are fed to the output of one of the channels. Selection by amplitude occurs TE: Kim way that the steps are SELECTION / C; -Uiz, -, Uim, 21, f / 22, .... llzm

(the first indices denote the group, and the second the channel) correspond to the same displacements equal to -. The diagram of FIG. 2

performed in the presumption that the controlled organ moves at a constant speed, i.e. equal intervals of time t correspond to the same movement m t. At the outputs of the filters 8, the envelopes of the pulse signals f / u, t / i2, ..., Him,

Uzi, Uzz; Uzm, which arrive at the inputs of elements 9 of unequalities. The fronts of the pulse signals Uu, Uiz, ..., w, 21.42, -, Uzm are shifted by one by -, therefore

t

the outputs of the unequal elements 9 at the moments of signal mismatch are allocated signals Ne, 7/12, Hzi, HSZ (indices after the letters denote the first - the group, the second - a pair of channels of the amplitude selector) whose width corresponds to -.

t

At the outputs of the unequal elements 10 in the channel of each group Hi, HZ, the width of the pulse signals is shortened AND | becomes equal to -. From the outputs of elements 10 2t

the inequalities of the signals Hi and Hg arrive at the inputs of the OR element AND, which combines the information into one channel and filling the resulting intervals between the signals. The output signals U are alternating pulses "1 and" O, the duty cycle of which is equal to two at a constant speed of movement, which corresponds to the unitary binary code. By the number of pulses entering the recording device (not shown in Fig. 1), it is thus possible to determine the position of the monitored organ from the fixed moment of the beginning of the movement, and on the frequency and width of the pulse signals the velocity of the monitored organ.

Since the number of channels with a certain complication of the amplitude selector can be quite large, according to this reduction, movement can be discretized without increasing the channels and phases of the movement sensor, which allows a significant expansion in the field of application of these converters.

Claims (1)

Invention Formula A transducer to pulse sequence containing a multi-channel displacement transducer, the outputs of which are connected to signal inputs of phase-sensitive amplifiers, the reference inputs of which are connected to the outputs of the reference voltage source, filters, unequalities elements, the outputs of which are connected to the inputs of the OR element, characterized in that The purpose of increasing the accuracy of the converter is to introduce amplitude selectors and additional elements into it.