SU1280305A1 - Displacement-to-phase converter - Google Patents

Abstract

The invention relates to a measurement technique, can be used to control movements. It allows to increase the accuracy of the displacement transducer into a phase, which contains a pair of windings 2, 3 placed in a bowl-shaped magnetic circuit and core core 1 with alternating electrically conductive ferromagnetic sections. The terminal leads of the windings 2, 3 are connected via phase-shifting capacitors 8-11 to a source 12 of sinusoidal voltage. To the same end terminals of the windings 2, 3 are connected adders 13, 14, with inverting inputs and implementing differential addition of signals taken from the windings. The outputs of the adders are connected to the input of the phase meter 15. When moving the core 1, the ratios of the active and inductive components of the impedance of the windings 2 and 3 and, respectively, the resonant frequencies of the oscillating circuits formed by the half windings 2, 3 and the capacitors 8-11 change. This $ leads to the phase of the signals, (L arriving at the inputs of the adders. As a result, when cor 1 is moved by an amount equal to the distance between its conductive parts, the phase of the resulting signal at the outputs of the adders 13, 14 is changed to 720 electrical degrees. 1 il.

Description

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The invention relates to a measurement technique and can be used to control movements.

The purpose of the invention is to improve the accuracy of the displacement transducer to the phase by reducing the temperature and frequency errors.

The drawing shows a schematic diagram of the transducer displacement into phase.

The converter contains core bar 1 made of ferromagnetic material, which is connected to the test object during measurements, and coaxial cylindrical coils 2 and 3 are installed along its axis. The armature is made with annular grooves in which rings 4 are installed di fost, for example copper. Rings 4 form electrically conductive, sections 5 of core 1, and the body of core 1 between rings 4 forms its ferromagnetic portions 6. Coils 2 and 3 are placed in the magnetic circuit 7 of the cup-shaped structure. The distance between the electrically conductive parts 5 of core 1 is equal to the distance between the ends of coils 2 and 3, the distance between the centers of the coils 2 and 3 is 2.5 T. The coils 2 and 3 are made with outlets from the middle connected to the common point of the converter. The phase terminals of coils 2 and 3 are connected to phase-shifting capacitors 8-11, the opposite terminals of which are connected to the coil 12 of sinusoidal voltage connected to the common point of the converter. One end terminals of coils 2 and 3 are connected by inputs of adders 13 and 14. One of the inputs of each adder is inverting. The outputs of the adders 13 and 14 are connected to the inputs of the phase meter 15. The capacitance value of the capacitors 8-11 is selected from the condition of equality of the resonant frequencies of the oscillating circuits formed by the half windings 2 and 3 and the capacitors 8-11, the frequency of the source 12 sinusoidal voltage -.

The displacement transducer works as follows.

When moving the core 1, its electrically conductive parts 5 move relative to coils 2 and 3, as a result of which the ratio between the values of active and id

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components of the impedance of the windings 2 and 3 and the variable volume. This leads to a change in the amplitude and phase of the alternating current signals taken from the connection points of the terminals of windings 2 and 3 with the capacitors 8-11. The form of the amplitude and phase dependence of these signals on the magnitude of the movement of the core 1 is close to sinusoidal. Due to the asymmetric arrangement of the electrically conductive portions 5 along the length of coils 2 and 3, the law of phase variation of the signals at the inputs of adders 13 has the opposite sign with respect to the law of phase variation of signals at the inputs of adder 14. At the output of adders 13 and 14, which realize the differential, signal addition circuit, resulting signals, the phases of which change in proportion to the movement of the core 1 in opposite directions. Therefore, with the movement of the core 1 to the distance T between the two electrically conductive parts 5, the phases of the signals at the outputs of the adders change by 360 electr., And the phase of the resulting signal by 720 el. hail.

Due to the two-fold differential conversion of signals taken from the converter windings, temperature and frequency errors are reduced and the conversion accuracy is improved.

When performing the core and magnetic conductor, for example, a toroidal transducer can also be used to control the angular displacements.

Claims (1)

1 The invention relates to a measurement technique and can be used to control movements. The purpose of the invention is to improve the accuracy of the displacement transducer to the phase by reducing the temperature and frequency errors. The drawing shows a schematic diagram of a displacement transducer into a phase. The converter contains core bar 1 made of ferromagnetic material, which is connected to the test object during measurements, and coaxial cylindrical coils 2 and 3 are installed along its axis. The armature is made with ring grooves in which rings 4 of high electrical conductivity material are installed such as copper. Rings 4 form electrically conductive, sections 5 of core 1, and the body of core 1 between rings 4 forms its ferromagnetic portions 6. Coils 2 and 3 are placed in the magnetic circuit 7 of the cup-shaped structure. The distance between the electrically conductive parts 5 core 1 is equal to the distance between the ends of coils 2 and 3, the distance from the center of the coils 2 and 3 is 2.5 T. The coils 2 and 3 are made with outlets from the middle connected to the common point of the converter. The terminal terminals of coils 2 and 3 are connected to phase-shifting capacitors 8-11, the opposite terminals of which are connected to the coil 12 of sinusoidal voltage connected to the common point of the converter. One end terminals of coils 2 and 3 are connected by inputs of adders 13 and 14. One of the inputs of each adder is inverter. The outputs of the adders 13 and 14 are connected to the inputs of the phase meter 15. The capacitance value of the capacitors 8-11 is selected from the condition of equality of the resonant frequencies of the oscillating circuits formed by the half windings 2 and 3 and the capacitors 8-11, the frequency of the source 12 sinusoidal voltage -. The displacement transducer works as follows. When the core 1 is moved, its electrical sections 5 move relative to coils 2 and 3, as a result of which the ratio between the active and active values 5 of the impedance of the windings 2 and 3 and the alternating gok changes. This leads to a change in the amplitude and phase of the alternating current signals taken from the connection points of the terminals of windings 2 and 3 with the capacitors 8-11. The form of the amplitude and phase dependence of these signals on the magnitude of the movement of the core 1 is close to sinusoidal. Due to the asymmetric arrangement of the electrically conductive portions 5 along the length of coils 2 and 3, the law of phase variation of the signals at the inputs of adders 13 has the opposite sign with respect to the law of phase variation of signals at the inputs of adder 14. At the output of adders 13 and 14, which realize the differential, signal addition circuit, resulting signals, the phases of which change in proportion to the movement of the core 1 in opposite directions. Therefore, with the movement of the core 1 to the distance T between the two electrically conductive parts 5, the phases of the signals at the outputs of the adders change by 360 electr., And the phase of the resulting signal by 720 el. hail. Due to the two-fold differential conversion of signals taken from the converter windings, temperature and frequency errors are reduced and the conversion accuracy is improved. When performing the core and the magnetic circuit, for example, a toroidal converter can also be used to control the angular displacements. Claim 1: A transducer into a phase comprising a pair of windings placed on a magnetic core, measles with alternating ferromagnetic and electrically conductive parts, connected to a common point of a transducer, a sinusoidal voltage source and a phase meter, characterized in that it is equipped with four phase-shifting capacitors and two szgmmators, the windings are made with a tap from the middle, connected to the common point of the converter, the capacitors are switched on; between the source of the voltage and the terminal ends of the windings, and the terminal ends of the windings, the sum moves of the adders are connected to the input, the tori are connected by inputs to a single phase meter.