SU1569525A1 - Differential transformer transducer of linear displacements - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to improve the measurement accuracy of a differential-transport transducer of linear displacements, the latter consisting of a cylindrical magnetic circuit 1, inside which two sections connected in series-opposite-opposite 3, 2 of the measuring winding are placed. Between them, an excitation winding 4 and a correction winding 6 are installed, and on their axes ferromagnetic measles 5, made in the form of a continuous cylinder, are mounted for movement. When moving the core 5, the emf induced in sections 2, 3 of the measuring winding changes, the difference between which is fed to the output of the converter. Placing the correction winding 6 on top of the measuring winding and the excitation winding and performing its length equal to the length of these windings, as well as a series-counter connection with the excitation winding, increase the linearity of the converter characteristic. The implementation of the magnetic core with a length exceeding the total length of the converter windings, as well as its installation with the possibility of moving along the axis, allows to weaken the magnetic asymmetry of the converter. 1 hp f-ly, 3 ill.

Description

w% shshsh Sh / shtzshshshshsh

W / //////////// A

tsh piece

5 - ШШ & ШШ2 &

ate

Od

WITH

ate

hO SL

The invention relates to a measurement technique and can be used, for example, in devices for automatic control of linear displacements or dimensions.

The purpose of the invention is to improve the measurement accuracy by reducing the non-linearity of the conversion as well as by reducing the magnetic asymmetry of the converter.

FIG. 1 schematically shows a differential-transformer linear displacement transducer, section; in fig. 2 is an electrical measurement circuit; in fig. 3 is a picture of the distribution of magnetic field lines.

Differential-transformer displacement transducer contains a cylindrical magnetic circuit 1, within which two coil sections 2 and 3 of the measuring winding are connected coaxially and connected in series. Between these sections of the measuring winding coil with them is placed the coil winding 4 excitation. On the axis of the winding 4 of the excitation and sections of the measuring winding is installed with the ability to move the ferromagnetic measles 5, made in the form of a solid cylinder with a length exceeding the length of the excitation winding 4. On top of sections 2 and 3 of the measuring winding and winding 4 of the excitation 35 of the transformation, it is equipped with

Neither inside the magnetic core 1 is placed a correction winding 6, connected in series with the excitation winding 4. The length of the corrective winding 6 is equal to the total length of the measuring winding and the excitation winding 4. The magnetic circuit 1 can be made with a length exceeding the total length of the converter windings, and is mounted for movement along its axis.

The displacement transducer works as follows.

When moving the ferromagnetic core 5, the magnetic fluxes inside sections 2 and 3 of the measuring winding are redistributed, as a result of which the emf induced by them changes,

95254

and a differential signal appears at the output of the converter. Due to the fact that the correction winding 6 is connected in series with the excitation winding 4, the uniform distribution of the power lines of the total magnetic field created by these windings in sections 2 and 3 of the measuring winding increases, thereby reducing the non-linearity of the conversion characteristic. To eliminate the magnetic asymmetry of the transducer caused by the nonidentity of sections 2 and 3 of the measuring winding, the magnetic circuit 1, whose length exceeds the total length of the windings, can be shifted along its axis, which allows to adjust the position of the zero conversion characteristic.

ten

15

20

five

0

Claims (2)

1. Differential-transformer linear displacement transducer, containing a cylindrical magnetic core, coaxially placed inside it and connected in series to the section of the measuring winding, an excitation winding placed between them and mounted on their axes with the possibility of moving ferromagnetic (measles, characterized in that increase the accuracy of measurement by reducing the non-corrective winding, which is connected in series with the excitation winding, is placed inside the magnet over the sections of the measuring winding and the excitation winding and made a length equal to the total length of these windings, and the ferromagnetic measles is made in the form of a solid cylinder, the length of which exceeds the length of the field winding. 2. The converter according to claim. Characterized in that, in order to reduce electromagnetic asymmetry, the converter magnetic circuit is made with a length exceeding the total length of the converter windings, and is mounted for movement along its axis. n but n n n I02 FIG. 2