SU896380A1 - Electromagnetic discrete displacement converter - Google Patents

Description

one

The invention relates to information measuring equipment and can be used to convert linear displacements into an electrical signal.

Discrete converters are known that contain an 11-shaped magnetic circuit, one pole of which is covered by a movable electrically conductive screen. In the gap between the poles of the magnetic circuit are located. Magnetically controlled sealed cone. ticks (CIMs), the closure planes of which are displaced from each other along the axis of movement of the screen by an amount equal to the thickness of the casing CIM flJ.

The disadvantages of this converter are low permissibility and sensitivity.

The closest to the invention in its technical essence is an electromagnetic discrete displacement transducer containing a movable screen connected in the measurement process with an object, and a fixed bipolar magnetic circuit with an excitation winding with an electrically conductive screen on the outer surface of one of the poles of the magnetic circuit enclosed by the movable screen and magnetically controlled contacts mounted along its longitudinal axis on the surface of an electrically conductive screen.

ten

CIMs are triggered when pa; the position of the movable screen in the closure plane of the NGCs from the flow created by it, 2).

ts

However, the device has a low sensitivity due to the small amount of secondary from the screen and low resolution due to the presence of displacement

20 along the axis of movement of the screen.

The purpose of the invention is to increase the sensitivity and resolution of the converter.

This goal is achieved by the fact that the converter is equipped with an additional U-shaped magnetic core covering a part of the movable screen in the area where magnetic contacts are located, the magnetic core is 0-shaped, magnetic contacts are installed on the entire surface of the electrically conductive screen with displacement both along the longitudinal and transverse axis of the converter, and the width of the magnetic circuit is chosen from

MKK MGK

km-e ,,

where bi is the width of the magnetic circuit,

L,) C is the length of the shell of the CIM, K is the width of the case of the CIM,

/ CG | H

1 is the distance between the contacts of adjacent CIMs along the axis of the converter.

FIG. 1 shows a converter, a general view; FIG. 2 shows section A-A in FIG. one.

The converter contains a closed stationary bipolar magnetic circuit I with a winding 2 of a buoy, along one of the poles 3 of which moves the enclosing movable screen 4, which is connected to the object during the measurement. The field winding 2 is placed on the base 5 of the magnetic circuit 1.

On the outer surface of the pole 3 there is an electrically conductive screen 6, on the whole surface of which there are installed with an offset both along the longitudinal and transverse axes of the transducer MGC 7-26. The magnitude of the transverse displacement of adjacent CIMs is equal to the width b, for the casing CIM of the longitudinal displacement - a distance of 1 "between

contacts of adjacent CIMs, Width b

Cl

magnetic circuit 1 is selected from the condition

t, mrc

m S

to where .f. | / length of the enclosure of the CIM;

mgK ™ Rii of an MGC housing, I is the distance between the contacts of adjacent MGCs along the axis of the converter.

Part of the movable screen 4, located under CIM 7-26, is covered by an additional I-shaped magnetic core 27.

The converter works as follows.

When the excitation winding 2 is connected to an alternating current voltage source (not shown), a closed magnetic flux F occurs (shown in Fig. 1 with a thin line), causing eddy currents in the moving screen 4. Eddy currents create a secondary magnetic flux FL, partially closed along an additional P-shaped magnetic circuit 27.

When placing the movable screen 4 with an additional U-shaped magnetic core 27 opposite the contact of any CIM (for example CIM 14),

Under the action of the secondary flow When the deviation of the deviating screen of the screen 4 with an additional U-shaped magnetic core 27 in one direction or another by the value of 1 |, the contact of the next CIM (for example, CIM 13 or 15) closes.

Thus, making the fixed magnetic circuit 1 closed makes it possible to increase the sensitivity of the converter due to a decrease in the scattering fluxes, and the introduction of an additional U-shaped magnetic circuit 27 covering the part of the moving screen 4 under the magnetically controlled contacts 7-26, setting the CIM with the described offset, as well as selecting the widths of the magnetic circuit from a certain ratio make it possible to increase the resolution of the converter.

Claims (2)

1. USSR author's certificate according to application no. 2634146/28, cl. G 01 B 7/00, 1978. 2. USSR author's certificate according to application no. 2699188/28, cl. GOI B 7/00, 1978. F & g / // - //