SU913229A1 - Electromagnetic converter - Google Patents

Description

The invention relates to a measuring technique and can be used in non-destructive testing of ferromagnetic products for direct conversion of the measured value into a discrete signal.

Known signal converters with a branched magnetic circuit, a rectangular cross-section of the holes, containing the exciting and measuring windings and providing direct conversion of electrical signals into a digital code with the memorization of the resultant w.

However, such converters have a closed magnetic circuit and cannot be used for non-destructive testing.

The closest to the purpose and the achieved result to the invention is an electromagnetic transducer for non-destructive testing, containing an open, branched

ten

2

magnetic conductor, excitation winding and measuring winding (2).

However, the output signal of this converter has an analog form and additional devices are required to convert it into code, which makes it difficult to use it in discrete control and regulation systems of technological processes.

The aim of the invention is to provide direct conversion of the monitored parameter in the code.

Circuit achieved in that vypolnen'iz magnetic material with a saturation induction ensuring its operation in the linear portion of the magnetization curve, and webs of a material with a rectangular hysteresis loop, and _m measuring winding covers these webs.

The drawing shows the design of the electromagnetic transducer with the scheme of its inclusion.

3 913229

Magnetic conduit 1 is divided into two circuits by a main jumper 2, on which an excitation (magnetizing) winding 3 is connected, connected to the generator 4 of a bilolar sawtooth current. One circuit is closed by a controlled part 5, and in the second one jumpers 6 are made of a material with a rectangular hysteresis loop. Jumpers 6 are covered by the measuring winding 7.

Electromagnetic converter works as follows.

When fed into the excitation winding 3 of the sawtooth current from generator 4, magnetic flux occurs in the magnetic circuit, which closes in one circuit through the controlled part 5, and in the other through jumpers 6. The change in the characteristics of the monitored part 5 leads to a change in its magnetic resistance, which causes a redistribution of the magnetic flow.

With a constant amplitude of the current in the winding 3, this leads to a change in the number of magnetized jumpers, previously magnetized in the opposite direction. Number remagnetizing webs determines the number of pulses in the scanning of the measuring coil 7 and ₃₀ characterized kontroliruemo- value of parameter 5 in detail.

The material of the magnetic circuit is selected with a high saturation induction that

He makes his work on the linear part of the magnetization curve.

The proposed design of the electromagnetic transducer allows the conversion of the electromagnetic parameters of the test piece into a discrete signal without additional, intermediate nodes.

Claims (1)

Claim Electromagnetic transducer for non-destructive testing, containing an unclosed branched magnetic circuit, an excitation winding and a measuring winding, characterized in that, in order to directly convert the monitored parameter into a code, the magnetic conductor is made of a material with saturation induction ensuring its operation on a linear portion of the curve magnetization, and bridges from a material with a rectangular hysteresis loop, and the measuring winding covers these bridges.