SU1167417A1 - Device for converting motions - Google Patents

Abstract

A device for converting a displacement, containing measles, two sensitive elements with windings, a series-connected power source and a controlled amplifier, the output of which is connected to the series-opposite connected first and second windings, a comparator unit and a computing unit, characterized in that accuracy due to a decrease in sensitivity to non-working displacements of the core, it is equipped with a third sensitive element with a third winding connected in series with the second winding The second selection is shifted in the direction of the transposable movement relative to the first core, the selection and storing unit of the analog signal, whose information inputs are connected to the first and third windings, and the output to the first input of the comparison unit, the second input of which is connected to the second winding, with a counter subtracting the input of which is connected to the output of the comparison unit, and the output - to the input of the Output processing unit, a clock generator, the output of which is connected to the installation input of the counter, a linearly varying generator April voltage included between the output of the clock generator and the control input of the amplifier element and Hold) ki included between; 1; y clock output and a control input of the counter.

Description

The invention relates to a technique for measuring conversion of displacements with the use of electromagnetic sensitive elements and can be used in control systems, monitoring and measuring various

physical quantities.

A device for converting movement is known, which contains a power source, measles, winding sensitive elements of which

 The Mocifely.Ki scheme is also included, which also contains compensation elements Tlj. However, the .HdsfecTHoe device is characterized by low conversion accuracy 5, due to the presence of significant sensitivity to non-working biases.

The closest to the invention to the technical essence is a device for transforming displacements, containing measles, two sensitive elements with windings, a series-connected power source and a controlled amplifier, whose output is under-25 connected to the series-opposite connected first and second windings. , a comparison computing unit, one of the inputs of which is connected to the source of the reference voltage, the other to the winding of the sensitive element, and the output to the control terminal 2, 1 -keeping is the low accuracy of conversion, due to the presence of significant sensitivity to displacements of the armature inoperative.

The purpose of the invention is to improve the accuracy of the conversion by reducing the sensitivity to non-operating displacements.

The goal is achieved by the fact that the device for converting

The displacement, containing measles, two sensitive elements with windings, 4S series-connected power source and controlled amplifier, the output of which is connected to the series-opposite connected first and second windings, comparison unit 50 and computing unit, is equipped with a third sensitive element with a third winding, connected in series with the second winding, the second bark, the displacement in the direction of the 55 scientific research institute of the displaced movement relative to the first core, the block for selecting and storing the analog signal a.

informational inputs of which are connected to the first and third windings, and outputs to the nepBONfy input of the comparison unit, the second input of which is connected to the second winding, a counter, subtracting the 11th input of which is connected to the output of the comparison unit, and the output to the input of the computing unit, clock generator, vg, whose input is connected to the installation input of a counter with a generator of linearly varying voltage, connected between the output of the clock generator and the control input of the amplifier, and a delay element connected between the output of the clock generator and a control input of a counter.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 depending on the output levels of the differential signals of the winding pairs on the working displacements.

The device contains an alternating current power supply 1, which is controlled by the control No. amplifier 2 and connected to the first 3, second 4 and third 5 windings, respectively, of the first 6, second 7 and third 8 sensitive elements with fixed ferromagnetic cores . The movable part of the device consists of the first 9 and second 10 koreas, made of their magnetic conductive material, fastened with a slip, ensuring their mutual displacement in the direction of the transference, windings 3 and 4 form the first winding pair, and windings 4 and 5 - the second. The device also contains a comparison unit 1t, a selection and storage unit 12)) an ansologic signal, the information inputs of which are connected to the first winding pair 3 and 4 and the output is connected to the first input of the comparison unit 11, to the second winding input of which the second winding pair 4 and 5, the counter 13, the subtracting input of which is connected to the output of the comparator unit 11, the clock generator 14 connected to the control input of the analog signal extraction and storing unit 12, the generator of the linearly varying voltage connected to the output of the generator The aperture 14, the delay element 16 connected between the output of the generator 14 and the control input of the counter 13, and the computing unit 17 connected to the output of the counter 13. The device works as follows. The amplitude Ij, alternating current 2 I2c: os2-ft (the f-frequency of the current supplying the windings 3-5) is periodically changed by supplying the control amplifier 2 with the output voltage. The generator 15, synchronized by the clock generator 14, changes accordingly and the voltage of the alternating current applied to the windings 3–5, the Output impulse and the generator 14 starts the next conversion cycle with a duration Tc. Within the working stroke of duration T, the generator 15, the amplitude 1 of the current, feeding the winding 3-5, decreases linearly (according to a linear change in the output voltage of the generator 15). l2 (t) g (To-t), O with A TO G) where g is the proportionality factor determined by the elements of the Tai tH of the power supply source 1, the generator 15, and the controllable amplifier 2. At the time t About the start of the next conversion cycle 1 , (0) The reference of the working coordinate x of the movable part is attached to the position of the first core 9. For definiteness, the magnitude of the mutual displacement of the movable part of the first 9 and second 10 Korea is shown in FIG. 1 equal to the distance from the center of the pair of sensitive elements 6 and 7 to the center of the sensitive element 7, and the value x O, depending on the specific ratios of dimensions and values of the electromagnetic parameters of the sensitive elements 6-8, on the distances between them, and also between the first 9 and the second 10 k-mi, referred to the center of the pair, containing the first b and second 7 sensing elements (Fig. 1). The operation of the device is considered for the x coordinate of the movable part. At the moment when the current has a maximum amplitude (,, the outputs of the first winding pair 3 and 4 relieve the difference in AC voltage with amplitude V. on the oppositely connected windings 3, 4, the output of the second winding pair is 4.5 - times AC voltage amplitude on windings 4 and 5. At the same time, as can be seen from the wiring diagram of windings 3-5, as well as the location of sensitive elements 6-8 and Korea 9 and 10 (Fig. 1), the first and second winding pairs have inverse one relative to another dependence of their output differential voltages on the over Moving part space In the interval О x 2W linear approximation, these dependences have the form Vg. -IKX4-2I KW. (3) - 1dKH, the coordinate of the moving part, where W corresponds to the equality of the output voltages of the first and second winding pairs at the same supply values their current, i.e., for X W, is equal to 35 K — the proportionality coefficient determined by the sizes of sensitive elements 6–8, cores 9, 10, as well as their electromagnetic properties. The magnitude of the coefficient K K (i / vz) depends on the transverse displacements of the movable part, which change the nominal gap (Gy between the fixed cores of sensitive elements 6-8 T cortex 9 and 10. Therefore, according to expressions (2), (3), the voltages Uj, 1145 and us amplitudes are dependent not only on the magnitude of the working displacements and supply of its current, but also on the transverse displacements of the movable part V, (X, SL, b) -, V45 (X,, 34 "VZ Dependences V Ip) at a fixed (X,. 45 yz non-working offset" (z const are graphically depicted in Fig. 2 with solid lines; dashed lines The inference shows that with a change (for definiteness, a corresponding reduction in the gap between the sensitive elements 6-8 and the cortex 9, 10) the magnitude of the displaced displacement (, X12, the position of the indicated graphs changes. The transverse nonworking changes can occur in any direction of any indicators, perpendicular to the working axis x, for example, the plane (2; X ,, x). Since at the time of the beginning of the next conversion cycle the amplitude value of the supply current la is maximum, the largest for this working coordinate x, (as well as for The OSs at the moment of non-transverse displacement tf of the SUB-SUSH part are also levels, cAvjz, Io) and 34o 1 (15, IQ) and 45o (Fig. 2). The output voltage of the first winding pair is sampled by supplying the output pulse of the clock generator 14 to the control input of the unit when the amplitude of the supply current 1 has the maximum value. The discretized level is then maintained on the output of the unit 12 comparison unchanged. This constant voltage is compared with the variable output voltage 1) 45 of the second winding pair supplied to the second input of the AND1 comparison unit. Since, at the time of sampling, the amplitude of the output voltage of the second winding pair exceeds the constant level and ,,. Д (FIG. 2) for all X 7 W (at the point X W the equality s} P takes place linearly decreasing the output generator voltage 15 and the corresponding reduction in the amplitude of the supply current Ij in the time interval from t О to the comparison time tj,) U, (. Q block 1 1 comparison produces pulsed U ,, with the frequency f of the supply current ij. Thus, the result is compared to the allocated interval t filled with impulses nx T, where T2 Vf - period d current, iij is the number of pulses received from the comparison unit 11 at the input of the counter 13 from the moment of sampling to the moment of comparison t. After the amplitude becomes less than the sampled voltage, there will be no change in the output states of the comparison block 11 and the arrival of pulses if the moving part is in the x W position, then at time t о and the levels and are already equal to each other, and their comparison occurs simultaneously with the discretization of the voltage U,, t, e, t O and p O, Equality served on input The block 11 of the comparison of the voltage Id-c and 1) 4.5-moment t О is expressed by the relations (2), (3) as follows l2 (t) k (CL ,,,.) х -Ik (tr ;,) x + + 2I, k (c) W, from where, using expressions (1) and (4), the coordinate value of the moving part -W 21о - 1, (.) 41, - Sll is determined. Ti is a constant value expressed in terms of known values of TQ, T, The number of output pulses n of block 11 Comparison is calculated using counter 13, since to determine the coordinate of the moving part it is necessary not only to calculate this number, but to perform the arithmetic operations provided by the expression (6 ), the pulses from the comparator unit 11 are fed to the subtracting input of the counter 13, with the initial moment of the next conversion cycle corresponding to the output of the output pulse of the clock generator 14, and the counter 13 through its installation input The unit code is entered. After the end of the working stroke of the generator 15 from the delay element 16, the delay time of the front of the input pulse of which is T, the control input of the counter 13 receives a signal зан recording the contents of the counter 13 - code (1-hn) to the computing unit J 7 ,, where The arithmetic operation of dividing the number W by the number (1-hn) received from the counter 13 is obtained. As a result, at the output of the computing unit 17, the number (code) X of the coordinate of the moving part along the axis of the working displacements is formed. During the nonlinear rise of the output voltage of the generator 15 occurring over the interval (TCz-Td), completing the conversion cycle, the amplitudes of the alternating voltage again begin to exceed the discretized level Ug and the comparison unit T1 again outputs pulses to the counter 13. However, this happens after when the content (1) of the counter 13 was transferred to the computing unit 17, and the unit code, recorded in the counter 13 at the beginning of each new conversion cycle, removes from the counter 13 the information contained in it shuya in the interval (TC-T (). In the following cycle described. (TC-2Tz) the conversion process proceeds similarly. The difference in the voltage level Uj in the intervals (0-TTz) and (TC-2Tz) conditionally shows the possible change in the working the coordinates of the moving part in the new conversion cycle, according to which the new values of the interval time t filled with the output pulses of the comparator unit 11, as well as the amplitudes of the output voltages Uj, 1145 of the first and second winding pairs. From FIG. 2 and 8 (6), it can be seen that the working conversion range corresponds to the section W i X 2W. If it is necessary to zero the result of the conversion in the computing unit 17 after performing division operations according to the formula (6), it is envisaged to reduce the operation by W, which corresponds to the transition to the working coordinate (i.e. X1 (X - W) and to the working range of the O conversion X W. The invention makes it possible to increase the accuracy of the conversion of displacements due to the elimination of the dependence of the output quantity on the non-working displacements of the moving part.

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Claims (1)

A MOBILE TRANSFORMATION DEVICE, comprising an armature, two sensing elements with windings, a power supply in series and a controlled amplifier, the output of which is connected to the first and second windings connected in series to the opposite, a comparison unit and a computing unit, resulting in that , in order to improve accuracy by reducing sensitivity to inoperative displacements of the armature, it is equipped with a third sensing element with a third winding connected in series with the second winding, in the second armature, displaced in the direction of the transformed movement relative to the first armature, the selection and storage unit of the analog signal, the information inputs of which are connected to the first and third windings, and the output to the first input of the comparison unit, the second input of which is connected to the second winding, a counter subtracting whose input is connected to the output from the comparison unit, and the output to the input of the counting unit, a clock generator, the output of which is connected to the installation input of the counter, a linearly varying voltage generator a switch connected between the output of the clock generator and the control input of the amplifier, and a delay element connected between the output of the clock generator and the control input of the counter. 1 167417