SU1196750A1 - Applied eddy-current converter - Google Patents

Abstract

An overhead whirling transducer containing a composite magnetic core including W-shaped cores with exciting windings placed on their central rods, as well as measuring windings, characterized in that, in order to control cylindrical objects, adjacent cores are connected by elastic members, and a piece of the body, you will need to get a piece of the body, and you will need to get a piece of the body, and you will be able to use the active cores, which will connect the cores to the cylinders. opposite, the measuring windings cover adjacent core rods and are connected according to one another, and the total number of cores is chosen even .

Description

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The invention relates to non-destructive testing and can be used to control the quality of cylindrical electrically conductive objects.

The purpose of the invention is the control of cylindrical objects.

The drawing shows the invoice eddy current transducer placed on the surface of the test object. The eddy current transducer is composed of a magnetic core formed by a W-shaped cores 1–4, on the central rods of a W-shaped cores 1–4, the excitation windings 5–8 are placed, and the excitation windings of the neighboring cores are switched on. Neighboring W-shaped cores are connected by elastic elements .9-11, and measuring windings 12-14 cover adjacent cores of the cores and are connected according to one another. The drawing shows a variant with four W-shaped cores. Their number may be different, but even.

Eddy current transducer. Works as follows.

The eddy current transducer is installed on the surface of a controlled cylindrical object 15 with a tensile force across this surface and energizes the exciting windings 5-8 from an alternating current source (not shown). Magnetic fluxes created by exciting windings 5-8, for 1967502

plug through the outermost rods of the corresponding U-shaped core and the object to be controlled. Each of the measuring windings 12-14 5 is coupled with magnetic fluxes of different directions. Therefore, with the same gap between adjacent cores of the W-shaped cores and the surface of the object to be monitored, the resulting voltage at the output of the measuring windings 1214 does not change. Due to the force generated by the elastic elements 9-11, the magnetic core fits tightly to the surface of the object being monitored, which provides the minimum variation of the gap between this surface and the ends of the adjacent rods of the W-shaped cores 1-4. It is recommended that the working ends of the W-shaped cores 1-4 be coordinated with the curvature of the surface of the object being monitored, which improves and stabilizes the electromagnetic coupling of the eddy current transducer to the monitored section. If there is a defect under one of the P-shaped cores 1-4, its magnetic fluxes change, which will lead to a change in the resulting voltage of the measuring windings 12-14. At the same time, in the case of a symmetrical position of the defect with respect to the neighboring Ш-shaped cores 1–4, the defect will be omitted. Therefore, it is recommended to re-scan the object being monitored with the appropriate eddy current transducer bias.

Claims (1)

An overhead eddy current transducer containing a composite magnetic circuit, including U-shaped cores with exciting windings placed on their central rods, as well as measuring windings, characterized in that, for the purpose of controlling cylindrical objects, adjacent cores are connected by elastic elements, exciting windings of adjacent cores are included , the measuring windings cover adjacent cores of the cores and are connected according to one another, and the total number of cores is chosen even. I f