CN2342353Y - Induction type angle displacement sensor - Google Patents

Abstract

The utility model discloses an induction type angle displacement sensor, belonging to the class of displacement sensor. The existing induction type angle displacement sensor has complex structure, large volume, and difficult installation and manufacture. The utility model provides an induction type angle displacement sensor which is provided with a rotary circular ring iron core capable of gradual deformation in an induction coil. The utility model has the advantages of simple structure, reliable work, and easy adjustment.

Description

The inductance type angular displacement sensor

The utility model relates to the improvement of inductance type angular displacement sensor, belongs to the displacement transducer class.

Existing inductance type angular displacement sensor is to adopt transformer working principle, on two iron cores, be wound with coil, a winding is fixed, another winding can Rotate 180 °, when angle changed, the position of two iron cores changed, and caused the variation of inductance value, such inductance type transducer complex structure, volume are big, install and make comparatively difficulty.

The purpose of this utility model provides and a kind ofly is made of telefault, annulus gradual change shape iron core, and is simple in structure, reliable operation, the inductance type angular displacement sensor that is easy to debug.

According to the principles of electric and electronic engineering, the inductance of a coil is relevant with the magnetic property of the size of coil, the number of turn and medium, is formulated as: $L=u\frac{{\mathrm{SN}}^2}{I}$ Wherein S is the area of coil, and N is the number of turn, and I is the length of coil, and u is a relative permeability, and after a coil wound, its shape, the number of turn, length had determined that just when u changed, inductance value L was also along with variation.

In the past inductive displacement transducer be adopt a coil by even iron core (magnetic conductive substance) in coil the position difference try to achieve different inductance values, obtain the position of iron core and the corresponding relation of inductance value, also just obtained the size of displacement.

The technical solution of the utility model is to have rotating annulus gradual change shape iron core in fixing telefault, in different angular displacements, the volume difference of iron core in coil, thus the inductance value of change telefault goes out the size of angular displacement according to the measure of the change of inductance value.

Fig. 1 is the structural representation of a kind of embodiment of the utility model.Fig. 2 is the structural representation of the another kind of embodiment of the utility model.Fig. 3 is the expansion shape synoptic diagram of annulus gradual change shape iron core among Fig. 2.Among the figure: 1 telefault, a, b are lead-out wires of coil; 2 annulus gradual change shape iron cores; 3 rotating shafts; 4 fixed supports; 5 pointers.

Below in conjunction with accompanying drawing the utility model is further described.

With reference to Fig. 1, this inductance type angular displacement sensor is made of fixing telefault (1), is characterized in having in telefault the annulus gradual change shape iron core (2) of (3) rotation around the shaft.

The volume of annulus gradual change shape iron core gradually changes along annulus is ascending, and when annulus gradual change shape iron core rotates (in 360 ° scope) in telefault, inductance value also will change thereupon.

This inductance type angular displacement sensor structure is simple, can reduce the volume of telefault, and linearity can be proofreaied and correct by revising iron core, and contactless, required torque is very little.Annulus gradual change shape iron core also can be made into flat slope shape shown in Figure 2, makes its handling ease, and linear the adjustment also makes things convenient for, and fixed pointers in rotating shaft (5) can directly demonstrate the variation of angular displacement.

Although iron core is that the linear dimension of slope shape gradual change may be fine in the actual measurement, but output might not be linear, because the inductance linearity of telefault is also relevant in the position of coil with frequency, the iron core of space and inductance measuring, so the linear problem in the reality also needs iron core is done a little corrections, the remanent magnetism of iron core can adopt beryllium Mo alloy-iron core to solve.Consider the influence to coil such as temperature, in actual the use is that two coils are made bridge diagram, one another is used for measuring as reference, and circuit is very stable like this, survey frequency should be on the resonance frequency of coil, during linear compensation, reference coil is operated on the one frequency of resonance frequency, in order to compensated linear, after again the iron core process being revised, can obtain good linearity.The gradient of iron core determines that by the internal diameter of coil and the factors such as precision of institute's angle measurement displacement the magnitude variations amplitude of inductance is bigger, and general output is enough to satisfy the demand.Telefault preferably shields, can be anti-interference, can improve precision again, because be unwarrantable with the narrowest place linearity at the widest part of iron core, this is because inductance value is not only influential to it with the iron core that inserts coil, and near magnetisable material is all influential to inductance value.Iron core is generally thin more to be beneficial to correction more, can fold up iron core after the correction, reduces coil dimension with the reduction width, and the size of whole angular displacement sensor is dwindled.This angular displacement sensor also can be used as displacement transducer.

Claims (1)

1, the inductance type angular displacement sensor is made of fixing telefault (1), it is characterized in that having in telefault the annulus gradual change shape iron core (2) of (3) rotation around the shaft.

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