SU1610247A1 - Transducer of angular displacements - Google Patents

Abstract

The invention relates to a measuring technique and has the purpose of improving the accuracy of a transformer angular displacement transducer containing an W-shaped magnetic core 1, on the central pole 2 of which primary winding 3 is placed, and on extreme poles 4 and 5 secondary windings 6 and 7 are placed. In the longitudinal plane of symmetry of the magnetic circuit 1, perpendicular to the poles 2, 4 and 5 there is an axis 18 of rotation of the core 15, made in the form of a hollow ferromagnetic cylinder 16, having on the surface facing to the central pole 2 of the magnetic circuit, the through slit 14 is in the form of one turn of the helical line 13. The end surfaces of the 8 poles of the magnetic conductor are cylindrical and bounded by two forming and two sections of the helical lines with lifting angles equal to the lifting angle of the helical line 13 of the through slit 14 on the bark 15. Due to this, the excitation magnetic flux, proportional to the angular displacement of the core 15, occurs between the extreme poles 4 and 5 of the magnetic circuit 1, which causes a higher linearity of output teristics converting angular displacement throughout the range of measurement. 2 Il.

Description

H

Ai.

Jli

16p f

:

five

five

± L

R

3

iA

yu li

Xj

to

five

18

The invention relates to a measurement technique and can be used to control the angular movements of objects used in various fields of technology.

The purpose of the invention is to improve the accuracy of the angular displacement transducer by reducing the nonlinearity of the output conversion characteristic.

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

The angular displacement transducer contains a three-pole W-shaped magnetic circuit 1, at the central pole 2 of which the primary excitation winding 3 is located, and at the extreme poles 4 and 5 secondary windings 6 and 7, connected counter-sequentially and connected to a measuring circuit (not shown), are located at the extreme poles. The end surfaces of the 8 poles of the magnetic conductor are cylindrical and bounded on two mutually opposite sides forming 9 and 10 of the cylindrical surface, and on the other two sides - sections 11 and 12 of helix lines whose elevation angles are equal to the elevation angle of the helix 13 of the through slot 14 on the core 15. The anchor is made in the form of a hollow ferromagnetic cylinder 16 mounted on a non-magnetic base 17 and having a through slot 14 in the form of a single turn of the helix on its surface facing the central pole 2 of the magnetic wire. yes 1.

The anchor 15 is mounted for rotation around its axis 18 lying in the longitudinal plane of symmetry of the 3 W-shaped magnetic circuit 1.

The transducer of angular displacements works as follows.

In the initial position, the section of the through slit 14 on the surface of the cylindrical core 15 is placed in the zone of the end surface 8 of the central pole 2, its division into two equal parts (figure 2). In this position, the magnetic fluxes generated by the primary winding 3 in the extreme poles 4 and 5 are equal, since the excitation flux is divided into two equal parts. Correspondingly, the EMFs generated by these flows in the secondary windings 6 and 7 are also equal. Since these windings are connected in series and counter, the output signal of the converter is zero. When the controlled object and the cylindrical core 15 are displaced angularly, the through slit 14 is displaced in the zone of the end surface 8 of the central pole 2 equidistant to itself by an amount proportional to this angular displacement. Due to this, there is a redistribution of magnetic fluxes in

the extreme poles 4 and 5 of the magnetic circuit 1, which leads to a change in the EMF values induced in the secondary windings 6 and 7, and to the appearance at the output of the EMF transducer, the magnitude and phase of which determine the magnitude and sign of the angular displacement of the object being monitored. Since the redistribution of magnetic fluxes during rotation of the core 15 occurs in proportion to the change in the area

the front cylindrical surface 8 of the central pole 2, and the proportionality coefficient is almost constant over the entire conversion range, then the proposed angular displacement transducer has a linear output response of the conversion over almost the entire range of controlled displacements.

Claims (1)

Invention Formula Angular displacement transducer containing a three-pole magnetic core, placed on its central pole primary winding, placed at its extreme poles and counter-connected secondary windings and mounted for rotation around an axis lying in the longitudinal plane of symmetry of the magnetic circuit, ferromagnetic measles, made in the form of a hollow cylinder with a through slot in the form of one turn of the helix on its surface facing the central pole of the magnetic circuit, characterized in that, in order to improve accuracy, the end surfaces of the magnetic poles are cylindrical and limited on two mutually opposite sides forming a cylindrical surface, and on the other two sides - sections of helix lines, the elevation angles of which are equal to the elevation angle of the helix of the through slot on the crust. Aa