RU69292U1 - Digital movement meter - Google Patents

Digital movement meter Download PDF

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Publication number
RU69292U1
RU69292U1 RU2007136354/22U RU2007136354U RU69292U1 RU 69292 U1 RU69292 U1 RU 69292U1 RU 2007136354/22 U RU2007136354/22 U RU 2007136354/22U RU 2007136354 U RU2007136354 U RU 2007136354U RU 69292 U1 RU69292 U1 RU 69292U1
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Russia
Prior art keywords
raster
displacement sensor
windings
output
analog
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RU2007136354/22U
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Russian (ru)
Inventor
Евгений Александрович Ломтев
Владимир Борисович Цыпин
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Государственное образовательное учреждение высшего профессионального образования "Пензенский государственный университет" (ПГУ)
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Abstract

Designed to measure linear and angular displacement. EFFECT: increased accuracy of measurement is achieved due to the fact that a device containing a current source connected to the primary winding of a raster transformer displacement sensor and a pulse generator of interrogation, the output of which is connected to the synchronization inputs of an analog-to-digital converter and amplitude-logic device connected via inputs with secondary windings of a raster transformer displacement sensor and through a switch with an analog-to-digital converter input, and at the outputs through positional code decoder to the input of down counter administered serially connected arithmetic unit and a register, the input of the arithmetic unit connected to the output of analog-to-digital converter, and the switch control inputs and the arithmetic unit connected to the output of the decoder positional code. 1 s.p. f-ly, 4 ill.

Description

The proposed utility model relates to the field of automation and information-measuring equipment and can be used to measure linear and angular displacements.
Known digital displacement meters based on raster transformer displacement sensors (Konyukhov N.E., Mednikov F.M., Nechaevsky M.L. Electromagnetic sensors of mechanical quantities - M .: Mashinostroenie, 1987). Their common drawback is low accuracy, limited by the minimum achievable dimensions and the number of teeth of the magnetic system that can be provided during manufacture.
Of the known closest in technical essence is a raster transformer transformer moving to code (utility model patent No. 63143, H03M 7/00, H02M 1/00, G08C 19/00, published 05/10/2007, Bull. No. 13). Its diagram is shown in figure 1, and figure 2 shows a timing diagram of its operation.
The raster transformer transducer of displacement to code (Fig. 1) contains a power supply source 1 of the raster transformer displacement sensor 2, a pulse shaper of a polling 3, a voltage control circuit 4, an amplitude-logic device 5, pulse counters 6, the number of which is equal to the number of outputs of the amplitude-logical 5 and depends on the number of secondary windings of the raster transformer displacement sensor 2, the position code decoder 7 and the reverse counter 8. The output of the power supply 1 is connected to between primary winding of transformer raster displacement sensor 2 and the input of the interrogation pulse generator 3. Output pulses poll 3 connected to the input amplitude synchronizing logic unit 5 and inputs reset pulse counter 6. The secondary windings of transformer raster displacement sensor 2
the voltage monitoring circuit 4 is connected, connected at the output to the control input of the interrogator, and the amplitude-logic device 5. The outputs of the amplitude-logic device 5 are connected via pulse counters 6 to a position code decoder 7, and the output of the latter is connected to a reverse counter 8.
A raster transformer transformer moving to code as follows. The AC signal U1 (Fig. 2) of the power supply 1 enters the primary winding of the raster transformer displacement sensor 2. Voltages U2 appear on the secondary windings of the raster transformer displacement sensor 2, the amplitudes of which depend on the position of the rod of the raster transformer displacement sensor 2 at a given time . When moving the rod of a raster transformer displacement sensor 2, the voltage amplitudes on the secondary windings change according to a sinusoidal law depending on the displacement. Moreover, changes in the voltage envelope in neighboring secondary windings are phase-shifted by the same angle (Fig. 2 shows the output voltage diagrams U2.1, U2.2, U2.3, U2.4 for a raster transformer displacement sensor 2 with four secondary windings, when Unlike the phase is 1/4 periods). The points of intersection (equality in pairs) of the voltage envelopes on the secondary windings divide the modulation period (pitch of the tooth pairing) into a number of zones that differ in the ratio of the voltages on the secondary windings. For example, in zone Z3 U4.1>U4.2>U4.4> U4.3 (Fig. 2).
The voltage control circuit 4 during the operation of the converter evaluates the voltage amplitudes on the secondary windings of the raster transformer displacement sensor 2. If these values exceed a predetermined minimum level, the control circuit 4 generates a signal that enables the inclusion of the pulse generator polling 3. Otherwise, in the raster transformer sensor
displacement 2 there is a malfunction, for example, an open circuit or a short circuit in one of the windings, the pulse shaper polling 3 does not turn on, and the control circuit 4 indicates a malfunction. Voltage monitoring can be carried out both once at the moment of switching on the raster transformer displacement sensor, and continuously throughout the entire operation time.
After switching on the pulse shaper, the polling 3 generates a packet of pulses U3 for polling the amplitude-logic device 5. The pulses U3 are located symmetrically in time with respect to the moments of the maximum voltage on the secondary windings of the raster transformer displacement sensor 2. The first pulse U3 is reset to pulse counters 6. For each pulse U3, the amplitude the logical device 5 compares the amplitudes of the voltage U2 on the secondary windings of the raster transformer displacement sensor 2. As a result, To the counting input of the corresponding pulse counter 6, “0” or “1” are supplied, depending on the ratio of the compared voltages. If the number of units is greater than or equal to half the number of pulses, then an overflow signal appears on the output of counter 6, which is fed to the position code decoder 7.
Using the position code decoder 7, which analyzes the output signals of the pulse counters 6, the zones Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8 are recognized inside the tooth pairing step. The decoder position code 7 generates a code area number. Reversible counter 8 captures this code and then incrementally increases or decreases it by one each time the zone number code is changed.
A disadvantage of the known raster transformer converter moving to code is low accuracy, limited by the minimum achievable size and number of teeth of the magnetic system that can be provided during manufacture.
The proposed utility model is aimed at eliminating these shortcomings.
This is achieved by the fact that in a digital displacement meter containing a current source connected to the primary winding of the raster transformer displacement transducer and an interrogation pulse generator, the output of which is connected to the synchronization inputs of an analog-to-digital converter and amplitude-logic device connected at the inputs to the secondary windings of the raster transformer displacement sensor and through the switch with the input of an analog-to-digital converter, and through the outputs through the position code decoder with the input ohm of the reversible counter, the arithmetic device and the register are connected in series, the input of the arithmetic device connected to the output of the analog-to-digital converter, and the control inputs of the switch and the arithmetic device connected to the output of the position code decoder.
Figure 3 presents the structural diagram of the proposed digital displacement meter, and figure 4 is an embodiment of an arithmetic device. The digital displacement meter contains a current source 1, a raster transformer displacement sensor 2, an interrogation pulse shaper 3, an amplitude-logic device 4, a position code decoder 5, a counter 6, a switch 7, an analog-to-digital converter 8, an arithmetic device 9, and a register 10.
The current source 1 is connected to the primary winding of the raster transformer displacement transducer 2 and the input of the polling pulse shaper 3. The output of the polling pulse shaper 3 is connected to the synchronization inputs of the amplitude-logic device 4 and the analog-to-digital converter 8. The inputs of the raster transformer displacement transducer 2 are connected to the inputs amplitude-logic device 4 and switch 7. The outputs of the amplitude-logic device 4 are connected to the decoder position code 5, the output
which is connected to the input of the reversible counter 6, the control input of the switch 7 and the control input of the arithmetic device 9. The output of the switch 7 is connected to the input of the analog-to-digital converter 8, the output of which is connected through the arithmetic device 9 to the register 10.
All devices included in the digital displacement meter can be implemented in the same way as in the prototype as separate functional units. The structure of the amplitude-logical device can be included pulse counters used in the prototype. Arithmetic device 9 can be implemented by various methods. The embodiment shown in FIG. 4 comprises voltage analyzers 11, the number of which corresponds to the number of secondary windings of the raster transformer displacement sensor 2, including a maximum voltage value storage circuit 12 and a minimum voltage value storage circuit 13; multiplexers 14 and 15; a circuit for calculating the amplitude of the carrier wave 16 and the envelope of voltage 17 and a circuit for calculating displacement 18. The inputs of the voltage analyzers 11 are connected to the output of the analog-to-digital converter 8. The outputs of the memory circuits for the maximum voltage value 12 and the memory circuits for the minimum voltage value 13 are connected, respectively, via multiplexers 14 and 15 with the inputs of the circuit for calculating the amplitude of the carrier wave 16 and the envelope of the voltage 17. The inputs of the circuit for calculating the displacement 18 are connected to the output of the analog-to-digital converter 8 and circuits for calculating the amplitude of the carrier wave 16 and the voltage envelope 17. The control inputs of the circuits for storing the maximum voltage value 12, circuits for storing the minimum voltage value 13 and multiplexers 14 and 15 are connected to the output of the position code decoder 5. The output of the displacement calculation circuit 18 is connected to the register input 10. It is also possible to implement the main nodes with software as part of
microprocessor.
The translate to code converter works as follows. The current of the power supply 1 enters the primary winding of the raster transformer displacement sensor 2. Voltages appear on the secondary windings of the raster transformer displacement sensor 2, the amplitudes of which depend on the position of the rod of the raster transformer displacement sensor 2 at a given time. When moving the rod of the raster transformer displacement sensor 2, the voltage is modulated on the secondary windings. The voltage amplitudes vary sinusoidally depending on the displacement, and the changes in the envelope of the voltages in the adjacent windings of the raster transformer displacement sensor 2 differ in phase by the same angle equal to 2π / n, where n is the number of secondary windings of the raster transformer displacement sensor 2. The modulation period corresponds to one step of the tooth pairing and the raster period. The points of pairwise equality of the envelopes of stresses on the secondary windings of the raster transformer displacement sensor 2 divide the raster period into a number of zones (raster steps), the number of which is equal to twice the number of secondary windings. The zones differ in the ratio of the values of the envelope of the voltages on the secondary windings of the raster transformer displacement sensor 2.
The interrogation pulse generator 3 generates pulses at the moments of maximum voltages on the secondary windings of the raster transformer displacement sensor 2. For each of these pulses, the amplitude-logic device 4 compares the amplitudes of the voltages on the secondary windings of the raster transformer displacement sensor 2. Using a position code decoder 5, analyzing comparison results by amplitude-logic device 4, the zones within the raster period are recognized. The decoder position code 5 generates a code area number. Reverse counter 8
cumulatively increases or decreases the number recorded in it per unit of displacement with each change in the zone number code. This is how the senior bits of the measurement result are formed.
During the initial setup of the digital displacement meter, the analog-to-digital converter 8 through the switch 7 is connected to the secondary windings of the raster transformer displacement sensor 2, and converts the voltage amplitudes U i on the secondary windings of the raster transformer displacement sensor 2 into a code for several steps of tooth pairing:
where U i is the voltage amplitude on the secondary winding of the raster transformer displacement sensor 2;
U H - the amplitude of the carrier oscillations on the secondary winding of the raster transformer displacement sensor 2;
U M is the amplitude of the envelope of the voltage on the secondary winding of the raster transformer displacement sensor 2;
k is a constant scale factor, depending on the design of the raster transformer displacement sensor 2;
x is the measured displacement;
φ i is the initial phase of the voltage envelope on the secondary winding of the raster transformer displacement sensor 2, depending on the number of secondary windings and the number of the secondary winding.
The arithmetic device 9, based on the results obtained, calculates the amplitudes of the carrier wave U H and the voltage envelope U M on each of the secondary windings of the raster transformer displacement sensor 2. In the operating mode, during the measurement process, the switch 7 is controlled by the position code decoder 5. Switch 7 at the time of changing the number code zone alternately connects the input of the analog-to-digital Converter 8 to those secondary windings of the raster
transformer displacement sensor 2, on which the voltage envelope at a given time is at maximum or minimum. So is the continuous correction of the values of the amplitudes of the carrier oscillations and envelope voltages on the secondary windings of the raster transformer displacement sensor 2 and its work is monitored. If the values of the voltage parameters on the secondary windings of the raster transformer displacement sensor 2 are outside the predetermined allowable limits, then the arithmetic device gives an error signal.
At the other measurement moments, set by the pulse generator 3, in accordance with the code of the position code decoder 5, the switch 7 connects the input of the analog-to-digital converter 8 to those windings of the raster transformer displacement sensor 2, at which the rate of change of the voltage amplitude depending on the displacement is maximum. The value of the phase of the voltage envelope on these windings should be in the ranges 0 ° -60 °, 120 ° -240 ° or 300 ° -360 °. The obtained code of the voltage amplitude value U i on the secondary winding of the raster transformer displacement sensor 2 is used in the arithmetic device 9 together with the codes of the values of the amplitudes of the carrier wave U H and the voltage envelope U M on this winding to calculate the displacement x:
The digits of the result of calculating the movement x, the weight of which is less than the weight of the least significant bit of the reverse counter 6 and displaying the movement less than one step of the raster, are recorded in register 10. Thus, the least significant digits of the measurement result are formed.
When using the arithmetic device 9, shown in figure 4, the memory circuit of the maximum voltage value 12 in the composition of the voltage analyzers 11 is isolated from the codes of analog-digital
transducer 8 and remember the maximum voltage values on the secondary windings of the raster transformer displacement sensor 2 U MAX = U H + U M. Schemes for storing the minimum voltage value 13 isolate and store the minimum voltage values on the secondary windings of the raster transformer displacement sensor 2 U MIN = U H -U M. Multiplexers 14 and 15 transmit to the circuit for calculating the amplitude of the carrier wave 16 and the envelope of voltage 17 codes U MAX and U MIN of the channel selected depending on the number of the raster zone by the signal of the decoder position code 5. The circuit for calculating the amplitude of the carrier wave 16 calculates the value U H = 0.5 (U MAX + U MIN ). The circuit for calculating the amplitude of the envelope voltage 17 calculates a value of U M = 0.5 (U MAX -U MIN ). The obtained results go to the displacement calculation circuit 18 together with the code U i obtained from the analog-to-digital converter 8. The displacement calculation circuit 18 according to the formula , calculates the displacement value, and the least significant bits of the result are written to register 10.
The introduction of an arithmetic device and a register with appropriate relationships allows to increase the accuracy of measuring displacement by evaluating its value inside the raster zones.

Claims (1)

  1. A digital displacement meter containing a current source connected to the primary winding of the raster transformer displacement transducer and an interrogation pulse generator, the output of which is connected to the synchronization inputs of an analog-to-digital converter and amplitude-logic device connected at the inputs to the secondary windings of the raster transformer displacement transducer and through a switch with the input of an analog-to-digital converter, and at the outputs through a position code decoder with the input of a reversible counter, characterized in that the arithmetic device and the register are connected in series, the input of the arithmetic device connected to the output of the analog-to-digital converter, and the control inputs of the switch and the arithmetic device connected to the output of the position code decoder.
    Figure 00000001
RU2007136354/22U 2007-10-01 2007-10-01 Digital movement meter RU69292U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2007136354/22U RU69292U1 (en) 2007-10-01 2007-10-01 Digital movement meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2007136354/22U RU69292U1 (en) 2007-10-01 2007-10-01 Digital movement meter

Publications (1)

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RU69292U1 true RU69292U1 (en) 2007-12-10

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MM1K Utility model has become invalid (non-payment of fees)

Effective date: 20091002