SU1226030A1 - Linear displacement transducer - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to increase the sensitivity of a linear displacement sensor of a transformer type comprising two transformers made on U-shaped cores. At the ends of one of the cores, ferromagnetic measles is installed with the possibility of changing the gap. The core of another transformer is magnetically insulated from the core. The primary windings of transformers are connected in series with each other - opposite, and its secondary windings, connected in series with each other, are connected via a rectifier to a load resistor. Next to the secondary windings, additional windings are placed on the cores, including those between them parallel to each other. A capacitor is connected to their ends, forming an oscillating circuit with the windings. As the core approaches the ends of the U-shaped core, its emf in the secondary and additional windings and the magnitude of their inductance increase. As a result, a difference current appears in the additional windings and the natural frequency of the oscillating circuit changes, which leads to an increase in the slope of the conversion characteristic. 1 il. i

Description

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

The aim of the invention is to increase the sensitivity of the sensor for using the phenomenon of electrical resonance.

The drawing shows a linear displacement sensor.

The sensor contains two P-shapeds of Core 1 with primary windings 2 and secondary windings 3 placed on them. Primary windings 2 are connected to each other in series-counter, and secondary windings 3 - in series. The free ends of the primary windings 2 are connected to an alternating current power source, and the intermittent diode 4 and the load resistor 5 are connected to the free ends of the secondary windings. Opposite the ends of one of the cores 1 is installed with the possibility of moving X in the direction of the ferromagnetic measles 6. This core with windings 2 and 3 forms the main transformer “Another core with windings 2 and 3 forms an additional transformer and there may be a magnetic insulator Ndr cor 6, Next to secondary windings E 3 on rods P-1 The samples GOVERNMENTAL cores placed additional coil 7 connected between a parallel-counter. A capacitor 8 is connected to their ends, the capacity of which is selected from the condition

where f

fp.

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natural frequency of the oscillating circuit formed by the windings 7 with capacitor 8,

supply voltage frequency. The sensor works as follows.

In the removed position, the core 6 magnetic resistances of the cores 1 of each of the transformers are equal to each other. As a result, the emf induced in the secondary windings 3 are equal. Since they are switched on counter, the amplitude of their total emf is zero and the output signal by 10

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load resistor 5 is missing. As the core 6 approaches the ends of the core 1 of the main transformer, its magnetic resistance decreases, and the inductive resistance of the primary winding 2, the voltage drop across it, and the transformer ratio of the transformer increase. As a result, the EMF value on the windings 3 and 7 of the main transformer also increases, a differential current appears in the parallel winding 7 of both transformers, and voltage pulses appear on the load resistor 5, the amplitude of which is uniquely related to the magnitude X of the core 6 displacement The differential current of the windings 7, which increases as the core 6 approaches, causes a decrease in the amplitude of the pulses on the winding 3 of the additional transformer. In addition, the approach of the core 6 to the core 1 increases the inductance of the winding 7 of the main

25 of the transformer, as a result of which the natural frequency of the oscillating circuit formed by the windings 7 with the capacitor 8 becomes close to the frequency of the supply voltage.

30 The shunting effect of the inductive component of the differential current on the magnitude of the EMF of the winding 3 of the main transformer is thereby compensated. As a result, the slope increases.

JC sensor conversion characteristics, i.e. its sensitivity increases.

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Claims (1)

Invention Formula A linear displacement sensor containing two transformers made on U-shaped cores with connected primary windings connected in series and connected in series according to secondary windings and mounted opposite the ends of one of the cores ferromagnetic measles, differing in that, in order to increase the sensitivity, it is equipped with a capacitor, and the transformers are made with additional windings connected in parallel with the counter to the condensate pv. X t ™ X X % Compiled by I. Kislitsyn Editor 0. .Yurkovetska Tehred V. Kadar Corrector, Shekmar Order 2109/27 Circulation 670 Under VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Hix