SU937992A1 - Functional inductive displacement converter - Google Patents

Description

(54) FUNCTIONAL INDUCTIVE TRANSFORMER

one

The invention relates to an instrumentation technique and can be used to measure displacements and to obtain a predetermined functional relationship between the measured signal and displacement.

Known functional transducers with movable flat functionaldiscodal windings placed in the gap of the stationary magnet guide f 1.

The disadvantages of such converters are the complexity of manufacturing, the limited range of displacements and the low sensitivity due to the fact that with large gaps in the magnetic circuit, the scattering flows increase, reducing the accuracy of the reproduction of a given functional relationship.

The closest technical solution to the invention is a functional inductive displacement transducer, containing ferromagnetic measles and a core with poles and placed on

DISPLACEMENT

The cores are series-connected inductors. The anchor has a constant cross section, so that with its linear or angular movement relative to the core poles, a given functional relationship is obtained, for example, linear, due to a corresponding change in the area of mutual overlap of the core poles and core of the converter i2.j,

The disadvantage of this converter is its limited functionality and accuracy, since it allows to reproduce only a linear relationship between its output sypnal and input displacement.

The purpose of the invention is to expand the functionality and improve the accuracy of reproduction of a given functional dependence.

Claims (1)

The goal is achieved by the fact that in a functional inductive displacement transducer, containing ferromagnetic measles and a core with 39 holes and placed on the socket, positively coupled coils of inductive type, measles are installed with a gap relative to the surface of the core poles, 0, O5-O , I is from the height of the core pole in the direction of the measurable displacements, and is made with a variable width y in its cross section varying in accordance with the formula Yao C - stLHYYP where) is the width in its direction sechvnkk-screw at a distance from its LA CS-gloss with the smallest width Vo, JH; j f () is a given functional dependence; cf - Air gap between the poles of the core and the core surface, m; - magnetic permeability of the air gap, GN / m; 1о - core pole height, m; (circular frequency of the converter supply voltage, rad / s; j (/ is the total number of turns of the inductance coils; R is the magnetic resistance of the core material and core, L.vit / VSG R is the total resistance of the coils and the core material and the core Ohm converter) Fig. 1 shows a schematic functional transducer, front view, and Fig. 2 is the same, top view. The functional transducer comprises a measur I cross-section shaped in a ferromagnetic material and a fixed heart 2 with a field. The anchor I is separated about the surface of the poles of the core 2 by an air gap sG. At the poles of core 2 there are frames 3 of an electrically insulating diamagnetic material with inductance coils 4 connected in series according to and connected to the measuring circuit 5 A display device 6 is connected to the measuring circuit circuit. displacement works as follows: When the core 1 moves relative to the surface of the poles of the core 2, the area 9 {X of the cross overlap of core I and the gons of the heart ka 2 vsleist & s which varies reaktiv24 newly resistance coils 4 induktivtsoera. The change in reactance and, consequently, the change in the output signal of the converter, coherent to the given functional dependence I (Y}, is determined by the cross-sectional profile of the core, i.e., its width) L in the cross section, which is determined by the relation xcfVFubRLOuo «- st / 1НхРйЛ where У is the core width in its cross section at a distance X from its end with the smallest width () (- given functional dependence, b - air gap between the core poles and the core surface, m; Q - magnetic permeability l air gap, GN / m;) - the height of the core pole, m; (j is the circular frequency of the converter supply voltage, rad / s; X / is the total number of turns of the inductance coils; IL is the magnetic resistance of the core material and core A, vit / a / B (f; I is the total resistance of the coils and core material and a sample box .. l. ohm. tsl top to reproduce at the output of the converter a given function (X) with an error not exceeding the specified minimum value of D, from the b pole of the laminated ferroma ™ core 2 should be derivative of the function At this point, any other values of the derivative in this region of a given ({the functional dependence f (X) cannot give a methodical playback error exceeding A. At the same time, the size of the air gap (Γ is chosen in the range 0, О5-0 , 1. from the height of the pole. The magnetic resistance of the air gap is several orders of magnitude greater than the magnetic resistance of the ferromagnetic areas of the grayish and the converter core, in which the magnetic flux created by the coils 4 and of the inductance As a result, the instability of the magnetic properties of the core material and the core of the converter practically do not affect the accuracy of the perforation of the function (X). In addition, the loss of sensitivity of the transformation is not very large, due to the limitation of the size of the air gap from above. In order for a given functional dependence f (X) to be fully reproduced in the corresponding range of displacements of core I, it is necessary that the width C of the pole, core 2 satisfies the condition r qx.-VO g. Thus, due to the corresponding cross-sectional profiling size, the non-reproduction of almost any functional dependence fC) at the output of the converter is ensured with a given accuracy. Claims of the Invention A functional inductive displacement transducer comprising ferromagnetic measles and a core with poles and successively connected skirt catchers placed on the core. inductance, characterized in that in order to expand the functionality and increase the accuracy of reproduction of a given functional relationship, measles is installed with a gap relative to the surface of the seamitech poles, made 5 O, 05-O, 1 width in its transverse, varying in accordance with the mule a () - R / UobLttW -RcTVfHO-RO Y - the width of the core in its cross section at a distance X from its end with the smallest width. ; f () is a given functional dependency; O is the air gap between the poles of the core and the surface of the core, m; - magnetic permeability of the air gap, GN / m; J3 - core pole viewpoint, m; (jt) is the circular frequency of the converter supply voltage, rad / s; W is the total number of turns of the inductor; R is the magnetic resistance of the core material and core,, A, VIT / V (G; R is the total active resistance of coils and the core material and core of the converter. Ohm. Sources of information taken into account during the examination. USSR author's certificate 88328, cl Q 08 C 9 / OO, 1965.. Ageikin DI Sensors of control and lyration, M., Mashinostroenie, 5, pp. 114 (prototype). Co