SU452760A2 - Transformer pressure sensor - Google Patents

Description

one

This invention relates to the field of measuring equipment.

1 main auth. St. No. 386293 from EEC: ten pressure transformer, containing a sensitive elec- tent and an in-movement displacement transducer, with measuring and compensating coils symmetrically arranged relative to each other on opposite sides of the air gap.

To protect against the effects of external magnetic fields, these sensors are equipped with special screens.

The proposed sensor, in order to eliminate the influence of external magnetic fields provided with an electronic analogue basic sensing element and an induction motion detector, is located HUMii ciiMKUipHHHO basic. The windings of the measuring and compensating coils of the transducers are connected to one another with () 1-lagio, and opposite to each other.

On fng. 1 shows a schematic diagram of / jfU4HKa; in fig. 2 - electric g-xxma switch on the washing of the coils of the inlux2 converter.

The sensor consists of two identical elastic sensing elements 1 and 2; two magnetic cores 3 and 4; for example, Imaginary, the poles of which form two air gaps of the slit type, field windings 5; two measuring coils 6 and 7 fixedly mounted on the moving centers of elements 1 and 2 and located in the plane of the air gap at equal distances from the center of the magnetic cores 3 and 4; spring current leads 8; two compensating coils 9 and 10 fixed fixedly in the air gap plane from the inner side of the poles at the same distance from their center.

The number of turns and the window area of measuring 6, 7 and compensating 9, 10 coils are the same.

Measuring 6, 7, compensation 9, S coils are connected according to, and compensation and measuring katugaykn with each other - counter.

The sensor works as follows. When the pressure P is changed, the elements 1 2 deflect and move the coils 6, 7 into the depth of the air gap, thus increasing the magnitude of the magnetic flux penetrating, therefore, increasing it; D. s., induced in the coils 6, 7, the sensor output appears on a voltage proportional to the pressure measured. Since the magnetic flux Fr, formed by the excitation winding 5, in the air gaps of the magnetic circuits 3 and 4 is directed in different directions, with the external variable magnetic in l Fp it is in one of the air gaps and the direction of the main magnetic flux towards Therefore, e. d., induced by the flux Φ l in coils located under the pole, where the flows are summed to add up to e, d. s, induced by the MAJOR flow, and in coils located under the other pole, are subtracted. Since the measuring 6 and 7 and compensating 9 and 10 coils are located at the same distance from the center of the pole, have the same number of turns and the window area, then e. C., induced in each measuring and in each compensation coil by an external magnetic field F, are the same. With the accepted connection of the windings and on the external magnetic field, the output voltage of the sensor is% K) K2 0% K2 and PC2) where t is the number of turns in the coils 6, 7. 9 and 10 respectively. F., OK1 OK2 magnetic fluxes formed excitations passing through the coils 6, 7, 9 and 10, respectively: P1 P2 PKG PK2 - external magnetic fluxes formed by sources through the fur, passing respectively through the 6, 7, 9 and 10 kaushki, Sjl And fj, the circular frequency of the main and external magnetic fields. Since W 2-% WKf% / ilf% 2% К1% К2 ф Wed 01 02 J „th ЛК1 V7 / C2; This% k, i.e., in the proposed sensor, the external continuous flow does not affect the output voltage of the sensor. Subject of the invention. Transformer pressure sensor according to aut. St. 386293, characterized in that, in order to eliminate the influence of external magnetic fields, it is supplied with. Complementary analogous main sensing element and induction displacement transducer, located symmetrically with the main ones, with the windings of the measuring and compensating coils of the transducers being connected to each other in accordance with and opposite to each other.

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FIG. one

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