SU1509947A2 - Functional displacement transducer - Google Patents

Abstract

This invention relates to analog and information technology. The aim of the invention is to expand the scope of the converter by reproducing alternating functions. The functional displacement transducer, comprising a differential magnetic circuit 1 with an excitation winding 4 and a measuring winding 5, is made with air gaps on the side rods x 2 and 3, in which there are movable ferromagnetic cores 6 and 7, covered from the sides external to the gap by metal brackets 8 , in the side walls of which the adjustment screws 9 are screwed along their length against the stop with the cores. 1 Il.

Description

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The invention relates to analogue and to information-measuring equipment and is a development and further improvement of the invention according to the author. St. No. 1285492.

The purpose of the invention is to expand the range of application of the converter by reproducing alternating functions.

Pa drawing presents a constructive diagram of a functional displacement transducer.

The functional displacement transducer comprises a differential magnetic circuit 1, made, for example, of two C-shaped cores 2 and 3. The excitation winding 4 is located on the middle core of the magnetic core 1.

On the side bars of the differential magnetic circuit, there is a measuring winding 5, made of two sections connected in series and counter. Magnetic 1

made with air gaps on the side rods in which the movable rectangular forms are located: ferromagnetic cores 6 and 7. Magnetic circuit 1 and cores 6 to 7 can be made of the same material, for example, from a magnet of soft ferrite. Both ferromagnetic cores 6 and 7 are covered from the outer sides with metal brackets 8, in the side walls of which adjusting screws -9 are screwed, resting their hemispherical ends through the washers 10 into the cores 6 and 7.

Functional displacement transducer works as follows.

An alternating voltage is applied to the excitation winding 4 of the converter, under the action of which a current flows in the winding 4 and an alternating magnetic flux is created. Since Magnetic core 1 is differential, this flux is divided into two magnetic fluxes, and Pg n ° to the cores 2 and 3, passage through the ferromagnetic cores 6 and 7. The magnetic fluxes f, and F interlock with the windings of the 6 second measuring winding 5 and induce an emf in them, and e. Since the winding sections 5 are turned on the opposite one: the emf at the converter output is equal to these differences EMF:

e e e

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R and F and the equality of the winding sections 5.

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When both of the pre-moving ferromagnetic cores 6 and 7 are found in the gaps of the cores cores 2 and 3, in the initial sections the magnetic properties of the cores 6 and 7 are equal to each other in these areas. This leads to equality of magnetic fluxes.

With e and e in the EMF at the output of the converter is zero.

Using screws 9 by screwing them into the brackets 8 at different depths and washers 10, various sections of movable ferromagnetic cores 6 and 7 are pulled together. Under the action of the compressive forces of the cores 6 and 7 that have arisen during this, various mechanical compressive stresses arise in separate sections in them, which lead to various changes in their magnetic permeabilities. By creating in this way, with the aid of screws 9 and washers 10, various compressive forces on individual sections of movable ferromagnetic cores 6 and 7, one obtains changes in magnetic permeabilities at their lengths according to different laws.

When moving, for example, the movable core 7 to the subsequent sections, where their magnetic permeabilities are different from the initial one, and the movable core 6 at this time remains stationary and plays the role of compensatory, a variable magnetic flux F differs from the compensation flux F, which decreases as displacement of the core 7. In this case, the emf e is reduced relative to e ,. The output is the EMF of a positive sign.

When moving, for example, vice versa, the movable core 6 to the subsequent sections, where their magnetic permeabilities are different from the initial one, and the movable core 7 at this time remains stationary in the initial section and plays the role of compensatory, a variable magnetic flux f | which decreases as the core 6 moves. In this case. In this case, the emf is also reduced relative to e. At the output there is an emf of negative sign.

In the general case, at the output of the converter, an emf arises, varying according to a certain law and having a different sign depending on the movement of the cores 6 or 7:

e f 4.44fu ... (P, - (J,) ± 4.44fx.x “. ((U.- | U,).

where w is the number of turns of the winding 4 vol

buzhdeni; Wj, is the number of measuring turns

winding 5;

f is the frequency of the supply current; I, is the current in the excitation winding 4 S is the cross section of the side rods of the cores 2 and 3; 1 — average length of magnetic flux line;

Iji Illi magnetic permeability of movable cores 6 and 7. Altering the law of the output EMF, you must change the law of distribution of magnetic permeability along the length of the movable cores 6 and 7 using screws 9, which are screwed into the brackets 8.

Claims (1)

Formula isobteni h Functional displacement transducer for aut. St. To 1285492, which is due to the fact that, in order to expand the scope of application by reproducing accumulative functions, the composite ferromagnetic core is made movable and covered from the outer sides of the gap by an additional metal bracket into which are screwed along as far as the stop with the core tuning screws.