SU1441186A1 - Transducer of angular displacements - Google Patents

Abstract

This invention relates to a measurement technique. The goal is to increase the sensitivity of the angular displacement sensor. It contains the stacano-laie stator 1 and rotor 2, i o-ropbie made of highly electrically conductive material and have windows 3 and 4 on their cylindrical surfaces, which are responsible for the sector angle 180. The winding 5 of the inductance of the sensor is placed on the frame 6, which is made with a window 7, corresponding to the sector angle 180 and offset 180 in space relative to the window on the stator. When the rotor 2 rotates 2, the screening effect of the overlapping electrically conductive parts of the stator 1 and the rotor 2 on the inductance of the winding 5 changes proportionally to the angle of rotation of the rotor 2, as a result of which the inductance of this winding changes. Reducing the gap between the winding 5 and the stator 1 in the region of the frame window 7 provides an increase in the relative value of the sensor to the angular displacement of the rotor. 2 Il. § (L

Description

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This invention relates to a measurement technique and is intended to measure angular displacements.

The aim of the invention is to increase the sensitivity of the angular displacement sensor by reducing the air gaps in the magnetic circuit of the sensor while ensuring the manufacturability of its design.

Figure 1 shows a schematic representation of an angular displacement sensor, a longitudinal section; in FIG. 2, section A-A in FIG. 1.

The angular displacement sensor contains coaxially arranged glass-like stator 1 and rotor 2, made of metal with high electrical conductivity. The stator 1 and the rotor 2 have raster windows 3 and 4 on their cylindrical surfaces, corresponding to sector angle 180. On the outer surface of the stator 1, a winding 5 of inductance with an annular dielectric frame 6 is placed. The frame 6 is mounted on the stator 1 with a tension, which ensures that there is no gap between them. The dielectric frame 6 is made with a raster window 7 corresponding to the sector angle 180 and offset 180 in space relative to the window on the stator. Along the edges of the window 7, chamfers B are made on the outer side of the frame B, so that the turns of the winding 5 of the inductance 5 are bent, which in the area of the window 7 of the frame fits snugly to the surface of the stator 1,

Angle sensor work

 em as follows.

In the initial position of the rotor 2, when the stator window 4 is completely blocked by the rotor body, the angle between the stato, rum 1 and rotor 2 is assumed to be zero. In this angular position, the shielding effect of the electrically conductive (metal) gchastkov stator 1 and rotor 2 is maximum, as a result of which the inductance of the winding 5 is minimal. With an angular movement of the rotor 2 inside the winding 5, areas not covered by the electrically conductive parts of the stator 1 and the rotor 2 appear, so that the inductance of the winding 5 increases in proportion to the angle of rotation of the rotor, reaching its maximum value at an angle of leo. When you turn on the winding 5 inductance

into one of the arms of the bridge circuit (not shown), into the other arm of which the reference winding of the inductance is connected, the voltage at the output of this circuit will vary in proportion to the angular displacement of the rotor 2.

The relative sensitivity of the sensor depends on the value of the inductance of that part of the winding 5, which is located above the center; the fair part of the stator 1. The winding 5 of the inductance can be represented as an equivalent massive coil, the inductance L of which consists of the inductance L {half windings of the winding, above the solid part of the stator, and inductance L semi-turns located above raster 4 stator.

The design of the angular displacement sensor is such that the angular displacement of the rotor changes only the magnitude of the inductance L., the half-turns located — above the raster window 4 of the stator, while the influence of the magnitudes; the inductance L on the relative sensitivity of the sensor wears back proportional character.

The implementation of the coil 6 frame with a raster window 7 and chamfers 8 provides the minimum possible gap between the solid part of the stator I and the half-windings of the inductance winding 5 by eliminating the thickness of the frame and the gap between the stator and the frame of the inductance winding. Reducing the gap between the half windings of the winding 5 and the stator 1 leads to a decrease in the inductance LJ; half windings of the winding 5, which provides an increase in the relative sensitivity of the sensor to the angular displacements of its rotor.

Claims (1)

Invention Formula An angular displacement sensor containing coaxially stacked stator and rotor made of highly electrically conductive material and having windows, corresponding to sector angle 180, on its cylindrical surfaces, an annular dielectric carcass mounted on the outer surface of the stator, and an annular winding placed on it inductance, from-. characterized by the fact that, in order to increase the sensitivity while ensuring the manufacturability of its design, a window with a pie angle of 180 is shifted by 180 relative to 144P86 in the dielectric frame. The window on the stator, and along the borders of the frame window, on the side of its outer surface, chamfers are made to smoothly bend the turns of the winding, which is adjacent to the surface of the stator in the region of the frame window. efjtip.l