CN2329939Y - Induction type displacement sensor - Google Patents

Abstract

The utility model relates to an improved induction type displacement sensor, belonging to the measuring sensor. The uniform iron core is changed into a slope-shaped variables iron core in the existing induction type displacement sensor; when the slope-shaped variables iron core passing through the coil is in the different displacement, the volume of the iron core in the coil is different, so that the inductance quantity in the coil is different; then, the corresponding relation ship of the position of the iron core and the inductance quantity can be figured out and the magnitude of the displacement can be obtained. The induction type displacement sensor has advantages of small coil volume and large measuring range.

Description

Inductive displacement transducer

The utility model relates to the improvement of inductive displacement transducer, belongs to the survey sensor class.

Existing inductive displacement transducer is made up of a coil and a uniform iron core, and this even iron inductance formula displacement transducer is to adopt a coil position is different in coil tries to achieve different inductance values and come Displacement Measurement by even iron core.The length of this even iron core displacement transducer coil is longer than the length of the iron core and the displacement of being surveyed, and when the displacement of being surveyed greatly the time, coil need be done very longly, thus this sensor not only volume is big, and measurement range is limited.

The purpose of this utility model provides that a kind of volume is little, measurement range is big, the simple and reliable displacement transducer that is easy to debug.

The purpose of this utility model is achieved through the following technical solutions.

This inductive displacement transducer is characterized in being made of coil and the slope shape variable iron core by coil.

Because the inductance value of a coil is relevant with the magnetic property of the size of coil, the number of turn and medium, be formulated as: $L=u\frac{S{N}^2}{l}$ S is the area of coil in the formula, and N is the number of turn, and l is the length of coil, and u is a relative permeability, and L is an inductance value.After a coil winds, its shape, the number of turn, length have just been determined, when u (iron core) changes, inductance value L is also along with variation, so the utility model is iron core is done slope-shaped, in different displacements, the volume difference of iron core in coil changes inductance value, thereby measures the size of its displacement.

Because adopt such scheme, coil can reduce, evenly the coil of iron inductance formula must be longer than iron core, otherwise when iron core passes coil, appoint iron core how to change inductance value and do not change; The distance of measured displacement simultaneously can be very long, as long as can keep the gradient of iron core; And the shape of iron core no matter be circular cone, round platform, pyramid, terrace with edge etc. all can, and linearity can be proofreaied and correct by revising iron core.

In the accompanying drawing: 1 is that coil 2 is a lead-out wires of coil for slope shape iron core a, b

Accompanying drawing is embodiment of the present utility model, when the slope shape variable iron core (2) that passes the coil of wire (1) when gradually changing from narrow to wide, inductance value in the coil (1) also will change thereupon, obtain the position of iron core and the corresponding relation of inductance value, also just obtain the size of displacement.

Claims (1)

1, a kind of inductive displacement transducer is characterized in that constituting by coil with by the slope shape iron core in the coil.

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