RU1827525C - Movement-phase converter - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure movements. The aim of the invention is to increase information content. The displacement-phase transducer comprises a sensing element including a ferromagnetic core mounted for displacement, a symmetrical ferromagnetic plate, excitation coil sections connected in series according to, measuring winding sections connected in series, a core, a measurement movement increasing reliability block into which includes keys, a reference phase-shifting unit, a control unit, a control bus, as well as a sinusoidal voltage generator, phase separation a flashing reference phase correction block, amplifier limiters, a phase meter incorporating a DC voltage amplification output stage, a converter sensitivity control unit, an alarm signal generating unit that includes an adjustable phase shifter, an amplifier-limiter, a comparison circuit; an alarm generating unit, which includes an adjustable phase shifter, an amplifier-limiter, a comparison circuit, as well as an alarm indication unit and an ind katsii alarm. 3 ill.

Description

The invention relates to a control and measuring technique and can be used to measure the movements of motor shafts (objects to be monitored), and record their position at critical points of the range of measured movements with the generation of distinctive signals.

The purpose of the invention is to increase information content.

In FIG. 1 shows a block diagram of a converter; in FIG. 2 is a vector diagram of output signals; in FIG. 3 - time diagrams of the output signals of the Converter.

The displacement-phase converter comprises a sensing element 1, including ferromagnetic core 2, mounted for displacement, balancing the ferromagnetic plate 3, sections 4 and 5 of the field winding, electrically connected in series according to sections 6 and 7 of the measuring winding, electrically connected sequentially counter, core 8, block 9 increase the reliability of the measured movement, which includes keys 10 and 11, the reference phase-shift00 hO

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a blocking unit 12, a control unit 13, a control bus 14, as well as a sinusoidal voltage generator 15, a phase shifting block 16 for correcting the phase of the reference signal, limiters 17 and 18, a phase meter 19, which incorporates a constant voltage output stage 20 current, block 21 for adjusting the sensitivity of the converter, block 22 for generating an alarm signal, into which the adjustable phase shifter 23 enters, amplifier-limiter 24, comparison circuit 25; an alarm generating unit 26, which includes an adjustable phase shifter 27, an amplifier-limiter 28, a comparison circuit 29, and an alarm indicating unit 31. In parallel with section 7 of the measuring winding, a phase-shifting element R is connected, for which a resistor is selected, which, in combination with the inductance of the measuring winding, is a phase shifter.

The converter operates as follows.

When the field winding (sections 4 and 5) is connected to the sinusoidal voltage source 15, the voltage Upa6 (x) and Uon (x), respectively, are excited in sections 6 and 7 of the measurement winding. Using a phase-shifting circuit (parallel connected inductance of section 7 of the measuring winding and element R), the phase of the sinusoidal voltage Uon (x) is shifted relative to the sinusoidal voltage of irab (x) by an angle $ j of more than 90 °, not less than 180 °. The voltages Crab (x) and Uon (x) are geometrically summed over sections 6 and 7, and the resulting signal VЈ and the reference signal Uon (x) are supplied through the switches 11 and the phase correction block 16 of the reference signal to the inputs of limiters 17, 18 respectively, from the outputs of which the signals 1% and Uon (x) are supplied respectively to the signal inputs BX.1 and BX.2 of the phase meter 19, which registers the phase difference between the signals U and U0n (x) in the form of a direct current voltage.

When moving the controlled object and the associated core 2 in the direction of increasing the gap (Zp, the voltage modulation on the windings 6, 7 is provided as a function of the movement dp,

Voltage Upa6 (x) driven by t in

section 6 decreases, and the voltage Uon (x), excited in section 7, increases.

The conversion function is determined by you 0 5 0

5

0 5 0 5

E

rage

REAR arctg sinj / b

5

then, /,. Upa6 (x)

cosvb + q ;;

ABOUT).

where YYYYH is the phase of the resulting total signal C relative to the voltage vector Uon (x);

Vo is the phase angle between the stress vectors irab (x) and Uon (x).

When the modulated voltages Upa6 (x) and Uon (x) change on sections 6, 7 of the measuring winding, the value and phase of the total (resulting) signal change by the value (deg) in the displacement function, which illustrates the vector diagram of the sensor output signals (Fig. 2), in which the stresses corresponding to the maximum clearance (Sp. max are indicated by a dash, and without it, the stresses corresponding to the minimum clearance pp min.

When measuring displacements in the operating mode, there is no control signal on bus 14, a control signal appears on the inverse output of block 13, which is fed to the control input of key 11 and opens it. From the direct output of block 13, the signal enters the input of key 10 and closes it. The total sinusoidal voltage UJT from the output of sections 6, 7 of the measuring winding is fed to the input of the first amplifier-limiter 17, and the reference sinusoidal voltage Uon (x) is supplied through the public switch 11 and the reference phase correction block 16 to the input of the amplifier-limiter 18 ,

From the outputs of the limiter amplifiers 17, 18, the signals J and U0n (x) are fed to the inputs of the phase meter 19, which registers the phase change of the total signal as a function of moving the ditch f (5P) at its inputs as a change in the DC voltage as a function of movement.

An increase in the information content of the converter, expressed in the generation and recording of warning information about the movement of the monitoring object in the zone, the presence of which can lead to a pre-emergency or emergency situation of the engine or other mechanism, is carried out as follows.

The sinusoidal reference signal U0n (input-18), which is input to the adjustable phase shifter 23 from the output of block 16, is shifted in phase with the help of the adjustable phase shifter 23 of block 22 so that when the object reaches the gap (measurement range point) 5P warning. at the output of matching circuit 25

signal U pre.as a sequence of rectangular pulses. At the same time (the outcome from practical considerations in the design) angle at warning. phase shift of the reference signal Don (out-23) at the output of the phase shifter 23 relative to the signal Uon (in-18) at its input can be adjusted within 0.5 rpm. phase change of the resulting total signal U corresponding to the range of measured displacements).

The phase-shifted signal U0n (out-23) from the output of the phase shifter 23 (shown in solid lines in Fig. 3d) passes through an amplifier-limiter 24, at the output of which a signal Uon (input 1-25) is generated (in Fig. 3d is shown by dashed lines), which is supplied to the first input 8X. 1 of coincidence circuit 25. to the second input ВХ.2 which receives a Don signal (input 2-25,29) of a rectangular shape from the output of the amplifier - limiter 17 (shown in dashed lines in Fig. 3b).

At the output of matching circuit 25, a warning signal ipred (in-30) is generated in the form of a sequence of rectangular pulses with increasing in duration with increasing duration as the measured gap increases (Fig. 3. e shows the maximum duration of these pulses), which arrives at the input of the warning indication unit 30. Block 30 provides conversion and indication of the warning signal in a light or other form, allowing it to be detected by an automatic control and regulation system by a machine (unit) or maintenance personnel and take necessary measures, for example, to prepare for operation of a backup machine or unit.

At the same time, the sinusoidal reference signal Uon (BX-18) is input to the adjustable phase shifter 27 of the alarm generating unit 26. Using an adjustable phase shifter 27, the signal Uon (BX-18) is phase-shifted so that when the object reaches the gap (measurement range point) dp avar, at the output of the matching circuit 29, the Uaep signal will appear as a sequence of rectangular pulses.

In this case (based on practical considerations in the design), the angle of rotation of the reference signal Uon (output 27) at the output of phase shifter 27 relative to the signal U0n (ex-18} at its input

can be adjusted within 0.8 re max. first technical phase-shifted signal Uon. (output-27) from the output of phase shifter 27 (shown in solid lines in Fig. 3e) passes through an amplifier-limiter 28, at the output of which a signal Uon is generated. (ex. 1-29) (in Fig. 3, e is shown by dashed lines), which is fed to the first input ВХ.1 of the coincidence circuit 29, to the second input ВХ.2 of which a signal U is received (input 2-25, 2 § A rectangular shape at the output of the amplifier-limiter 17 (shown in dashed lines in Fig. 3b). The Uaeap alarm is generated at the output of the matching circuit 29. (I-31) as a sequence of rectangular pulses with a changing direction increase in duration as the measured gap increases (in Fig. 3. g shows the maximum duration of these pulses). steps to the input of block 31, the alarm indication.

Block 31 provides conversion and indication of the alarm signal in a light, sound or other form that allows it to be detected by an automatic control system by a machine (unit) or maintenance personnel and take emergency measures to stop the machine in order to prevent an emergency and give a start command into the operation of the backup machine (unit), prepared for operation after issuing an alarm.

Claims (1)

SUMMARY OF THE INVENTION A displacement-phase transducer comprising a sensing element including a ferromagnetic core mounted for displacement, symmetrical to a ferromagnetic plate, two sections of the field winding connected in series, two sections of the measuring winding connected in series, a block for increasing the reliability of the measured movement, a generator sinusoidal voltage, phase correction block of the reference signal, two amplifier-limiter, phase meter and control unit audio sensitivity of the transducer, characterized in that. in order to increase information content, it is equipped with a warning signal generating unit, made in the form of a series-connected adjustable phase shifter, an amplifier-limiter and matching circuit, an alarm signal indicating unit, an alarm generating unit, made identical to the warning signal generation unit are connected to the output of the first signal, the display unit of the ava amplifier-limiter, the outputs of the circuits of the sovry signal, the inputs of the drop blocks of the warning generation units of the warning and auto and alarm signals signals are connected to the output of BLO-5 are connected to the inputs of the display nodes of the pre-correction phase of the reference signal, alarm and alarm signals, the other inputs of the matching circuits of blocks, respectively, the world of warning and accidents. Vpad (x) M Cp (x) Ubnw FIG. 2 Go go 3