SU756452A1 - Shaft angular position-to-code converter - Google Patents

Description

The invention relates to systems for automatic control and conversion of analog values into a discrete signal, namely to converters of the angle of rotation of the shaft into a code. ^five

Known Converter angle of rotation of the shaft in the code that contains the coding elements with packages of permanent magnets, creating a magnetic field of the working of the gaps, which set the magnetically sensitive reading elements (and.

The disadvantage of such a converter is the low manufacturability of the coding element, which consists in installing a large number of individual magnets. In addition, the assembly of the coding element from separate permanent magnets requires high precision manufacturing of the latter and the need to select them according to magnetic parameters.

The closest uo its tech- nical __ solution to this ustroy- ^Λ is stvu converter crank angle to the code bits comprising coding elements made in the form of two magnetic cores, between which schityvayu2

elements, and the coding elements of the bits are interconnected and with the shaft through mechanical transmissions [2].

The residual of this device is its relatively low accuracy.

The purpose of the invention is to improve the accuracy of the Converter angle of rotation of the shaft in the code.

This goal is achieved due to the fact that in the converter of the angle of rotation of the shaft into the code the magnetic cores of the coding elements of each discharge are equipped with semi-ring pole pieces, between the magnetic wires there is a ring permanent magnet shifted in the direction of the pole tips of the magnetic circuits of the coding elements.

FIG. 1 schematically shows a converter of the angle of rotation of the shaft into a code; in fig. 2 shows the coding element of one of the samples.

The converter of the angle of rotation of the shaft into the code contains the coding elements of the discharges, consisting of magnetic cores 1 and 2, an annular permanent magnet 3. The coding elements are transmitted through mechanical elements,

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consisting of gears 4, 5, and 6 and tribs 7 are interconnected with the input shaft 8, with gear 4 transmitting the rotation angle to the low-order coding element, and tribing 7 transmitting the scaled rotation angle to the following transducer bits.

The coding elements together with the gears rotate around a non-magnetic axis 9 rigidly fixed in the converter housing 10, in which the reading elements 11 are also placed. Gear 6 has two depressions through 180 °.

In the coding element of each reference (FIG. 2) between the magnetic cores 1 and 2 (one of the magnetic cores is shown in FIG.), An annular permanent magnet 3 is placed, and a working gap is formed between the semi-annular pole pieces 12 of both magnetic circuits. The uniformity of the magnetic flux in the semi-circular operating gap is provided by moving the magnet 3 along the line indicated by the arrow, perpendicular to the diameter of the protrusions by the value of d, which is determined when setting the coding element. In addition, moving in the indicated direction. provided more induction in the working gap, i.e., increase the utilization rate of the whole volume of the magnet.

The Converter operates as follows.

When the shaft 8 is rotated at a certain angle, a part of the magnetosensitive reading elements 11 is in the working gap between the pole pieces 12 of the coding element and excited by magnetic flux, and a combination of “unit” signals appears on the corresponding reading elements. When the shaft 8 is rotated through the angle o1 - 180 °, the gear 6 with troughs turns the tongue 7 by the angle determined by the ratio of the discrete transmission gear formed by

5 and triby 7. In this case, the combination of signals changes

at the output of the readable magnetic elements 11 of the following

countdown.

The use of an annular magnet and magnetic circuits with half-ring pole pieces reduces the laboriousness of manufacturing the coding elements of the transducers and increases the reliability of the device, which consists in ensuring a uniform flow along the working gap, eliminating the influence of the spread of magnetic parameters of permanent magnets and their geometric dimensions.

The economic effect from the use of this technical solution due to the above-mentioned technical advantages.

Claims (1)

Claim The converter of the angle of rotation of the shaft into a code containing the coding elements of the discharges, made in the form of magnetic conductors, between which the reading elements are located, and connected to each other and to the shaft through mechanical transmissions, characterized in that, in order to improve the accuracy of the converter, the magnetic conductors encoding elements of each discharge are equipped with semi-ring pole pieces; between the magnetic cores there is a ring permanent magnet, which is offset in the direction of the pole tips of the cod magnetic cores uyuschih elements.