SU446092A1 - Angle Code Transducer - Google Patents

Description

(54) U1OL CODE CONVERTER

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The invention relates to the field of computer technology, namely to contactless angles of rotation in code.

Angle-code converters are known that contain coded drums with magnetic inserts and reading elements.

The disadvantages of such converters are not sufficiently high reliability and accuracy of conversion.

The purpose of the invention is to increase the reliability and accuracy of the conversion.

This is achieved by the fact that, in the proposed converter, the reading elements are made in the form of C-shaped magnetic circuits, in one gap of which the Hall elements are located, and in the other - the magnetic inserts of code drums.

The drawing shows the converter UHB code.

It includes four concentric code drums 1-4, made of an ISOLATING material and rigidly attached to each other and the shaft 5, with which they rotate around the axis C) sb

I On the surfaces of the code drums there are inserts 6 of permanent magnets in accordance with the law of the chosen code (the drawing shows the case of binary

code).

The transducer magnetic circuit consists of two identical symmetrically located C-shaped elements 7 and 8, forming two uniform air

a gap, in one of which Hall elements 9–12 are located (for the corresponding code tracks), and in the other — code drums with inserted magnets.

Transducer principle

is the following. When the code drums rotate, magnetic inserts periodically enter the area of the working gap. In this case, the corresponding

a magnetic flux flows through the magnetic conductor, and a signal appears at the output of the Hall element (corresponding to 1 in this code bit):

F

Jftblx xT

th ...:

where K is a constant coefficient;

1x- Hall current;

f - magnetic flux created by magnetic inserts;

g - the cross section of the gap with the element of the Hall.

In the case when there is no poshyshy magnet in the working gap, there is no signal at the output of the Hall element (O in the output code).

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A converter that removes coded drums with magnetic inserts and readout elements, which is intended to increase the reliability and accuracy of the .., ...,. - -fD-

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Calls that read elements of the output in the form of C-jubilee magnetic conductors, in one gap of which the Hall elements are located, and in the other - the magnetic inserts of code drums.