SU1421981A1 - Displacement transducer - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to expand the range of an unambiguous reference of the movements of a transformer converter with vernally mated teeth on its ferromagnetic stator and rotor due to the formation simultaneously with an exact reading (within one tooth division) and a rough reference of movements (within several tooth divisions). On the rotor of this converter, sectioned field windings, precision and coarse readings are placed in common longitudinal grooves. The sections of the excitation winding and the exact reference are distributed around the circumference of the cylindrical rotor of the converter, and the coarse reference winding sections are also distributed along the length of the rotor and have a predetermined length and direction of winding. The relative movement of the ferromagnetic stator and the rotor of the converter causes a change in the area of overlap of their teeth, which leads to a change in the magnetic resistance in the path of the excitation flow, thereby allowing for the modulation of the EMF induced in the precise and coarse windings as a function of the displacement. 5 il. (/)

Description

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The invention relates to a measurement technique and can be used to measure linear and angular movements.

The aim of the invention is to expand: - the range of the unambiguous reference of movements by forming simultaneously with the exact reference (within the limits of a single division), as well as the rough reference of movements (within several divisional divisions).

FIG. 1 shows schematically a displacement transducer in the cylindrical design of its stator and rotor; in fig. 2 - scanning of the toothed surface of the rotor with sections of the excitation winding placed in its longitudinal grooves; in fig. 3 - scanning of the toothed surface of the rotor with sections of the precise counting winding placed in the same grooves; figure 4 - scan cog. rotor surfaces with sections of coarse counting windings placed in the same grooves; in fig. 5 shows voltage diagrams of the windings for accurate and coarse readings.

The displacement transducer comprises ferromagnetic stator 1 and rotor 2 installed with the possibility of relative linear or rotational movement, having teeth on the surfaces facing one another and made with the same pin and different angles of inclination relative to the direction of their mutual displacement. For example, with linear movement of the stator-1 relative to the rotor 2, which in this embodiment is mounted movably, which is carried out, for example, with the help of non-ferromagnetic guides 3, the teeth on the stator are angled, and on the rotor - at a right angle X directions of their mutual linear displacement. On the cylindrical surface of the rotor 1, four longitudinal paea are displaced along its generatrix with an offset between them by a quarter of the circumference of the rotor in which the converter windings are located. The primary excitation winding of the converter is made of four connected in series and counter sections 4-7 laid in the specified longitudinal slots of the rotor (Fig. 2). The exact countdown winding (TO) is made in the form of two pairs of sections 8-11 connected in parallel, which in each pair 8, 10 and 9, and are located on the rotor diametrically opposite to each other and are interconnected counter-sequentially (Fig. 3).

In the same longitudinal slots of the rotor there are two pairs of three-section windings 12–15 of rough count (GO), interconnected according to each other in each pair (figure 4). The outermost sections of one pair of windings 12 and 14 of a rough reference span 20 and 40%, respectively, and the other pair of windings 13 and 15-40 and 20% of teeth along the rotor length and are wound in one direction, for example, clockwise, as shown on the surface scan. rotor. The middle sections of all coarse reference windings are wound in the opposite direction — the first one — the SRI; counterclockwise, and cover the remaining 40% of the teeth along the length of the rotor 2 transducer.

The module for providing electrical connections between the winding sections of the converter and a dielectric wicker 16 is used to connect the electronic signal processing unit.

The displacement transducer operates as follows;

The primary excitation winding creates a magnetic field in the ferromagnetic cylinder of the stator 1 and the ferromagnetic rotor 2 of the transducer. Due to the counter-series connection of the excitation winding sections 4-7, the flow exits two diametrically opposite sections, for example 4 and 6, and closes through the ferro-magnetic stator cylinder 1, the length of which is approximately 20% of the rotor length, and the other two diametrically opposed sections 5 and 7 of the primary field winding. Every half-period of the supply current, the direction of the magnetic flux is reversed. This creates an electromotive force in the secondary windings of the GO and TO, which depend on the magnetic conductivity of the air gap between the corresponding winding sections of the ferromagnetic rotor 2 and the opposite parts of the ferro stator ferrite cylinder 1. The larger area of overlap the teeth of the stator and rotor (Fig. 2 it is shown by double hatching), the more EMF induced in the winding sections of the TO and GO of the rotor 2. With a linear relative movement of the rotor 2 and the stator 1, the area of the teeth overlap and, consequently, the magnetic sop Motivation in the path of the excitation flow, which leads to a change in the EMF in the corresponding secondary windings of the GO and TO converter. The dependence of the amplitude of the induced emf on movement, for example, in sections 8 through 10 of the windings TO (i, j) is shown in FIG. 5, solid and dotted lines, respectively. Due to the counter-sequential switching on of the winding sections, the total emf U, depending on the movement, is close to harmonic. Due to the bevel of the teeth of the ferromagnetic rotor 2 and the ferromagnetic stator 1, the envelopes of the signals of both pairs of sections 8-10 and 9.11 of the precise counting winding have a spatial shift between them equal to a quarter of the pitch of the cutting teeth. At the same time, the EMF of winding pairs 12, 14 and 13, 15 of rough counting depends not only on the area of overlap of the teeth of the rotor 2 and the ferromagnetic stator.1, but also on the winding direction of that part of the section above which the ferromagnetic stator 1 is located. Dependence of the amplitude of the induced EMF ( o 14) in sections of one of the pairs of windings, for example 12 and 14, the CO from moving is shown in FIG. 5, solid and dotted lines, respectively.

Thanks to the successive inclusion of the windings 12, 14 and 13, 15 in each pair of windings in the envelopes of the total emf, roi (x) of their outputs (Fig. 5), displaced in space relative to each other by a quarter of the period, the influence of perforation modulation of the magnetic conductivity of the air gap between the stator 1 and the rotor 2 of the converter.

The resulting two-phase EMF systems Upj, Upp and the result of the SRF by increasing the number of longitudinal grooves, and consequently, the number of winding sections TO and GO, can be obtained and a larger number of phases of the output signals are fed into standard conversion units, usually used with double counting sine-cosine rotary transducers.

Due to the introduction of a rough calculation, the range of the unambiguous - the reference of displacements, corresponding to

the length of the rotor, zany that partitioned windings GO.

The proposed ratio of the sizes of the coarse reference windings sections and the sizes of the ferromagnetic stator, as well as the winding of these sections and the scheme of their inclusion are due to the need to obtain the given coarse output envelopes shown by Bbmie. With others

ratios of sizes can change the shape of these signals and their mutual spatial shift. In this case, there are regions of ambiguity in some ranges of the measured linear movement, when both coarse signals do not vary in size, as a result of which the output code of the coarse channel will not correspond to the measured movement.

The advantage of the proposed converter is insensitivity to failures in its power supply system. In this connection, a periodic operating mode of the converter is possible, in which the power is supplied to it and to the electronic processing unit of its signals only at the moment of requesting information on the controlled movement of the external measuring system, which significantly reduces its power consumption.

Claims (1)

Invention Formula A displacement transducer containing ferromagnetic stator and rotor installed with the possibility of relative linear or rotational movement on facing one to another surfaces of which teeth are made with the same pitch and with different angles of inclination relative to the direction of their mutual movement, and a sectioned excitation winding and a sectional winding of the exact reading, located on the rotor in its longitudinal grooves, are only the purpose expansion of the range of unambiguous counting, displacements, it is provided with two pairs of three-section coil windings placed in diametrically opposite longitudinal grooves of the rotor MCN sixteen / J Vu.z.l fPus.2 9uz, 3 ; g / /five/ ft / 15 shhh D DDDDLBDDDDQOD DDODDDDDrnDDDDQ: H DDDDDaDDDnnmDD V- n, a. D H (Rig. re,