SU1670575A1 - Matrix electromagnetic to control physical and mechanical parameters of ferromagnetic materials - Google Patents

Abstract

The invention relates to non-destructive electromagnetic control methods and can be used for multi-parameter control of the electromagnetic properties of materials. The aim of the invention is to improve the accuracy. The converter contains a U-shaped magnetic circuit with sections uniformly placed along it, which are grouped in pairs of measuring and exciting windings, a generator of adjustable current, and a switch, the contacts of which are connected to the output of the generator, the input of the indicator and the inputs measuring and exciting windings of the relevant sections. 2 Il.

Description

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(21) 4714159/28 (22) 07.06.89 (46) 15.0891 Bull. G 30

(71) Zaporozhye Center for Scientific and Technical Creativity of Youth

(72) V.I. Chaplygin, V.A. Kalika, N.F. Potapova and Ya.V.Maltsev (53) 620.179.142.5.6 (088.8)

(56) Gerasimov V.G., Klyuev V.V., Shaternikov V.E. Electromagnetic control methods and devices for industrial products. M .: Energoatomizdat. 1983, p. ten.

(54) MATRIX ELECTROMAGNETIC CONVERTER FOR CONTROL OF PHYSICAL AND MECHANICAL PARAMETERS OF FERROMAGNETIC MATERIALS

(57) The invention relates to non-intrusive electromagnetic control methods and can be used for multi-parameter control of the electromagnetic properties of materials. The aim of the invention is to improve the accuracy. The converter contains a U-optic magnetic circuit with sections uniformly placed along it, representing grouped measuring and exciting windings in pairs, a variable-frequency excitation generator, and a switch, the contacts of which are connected to the generator output, the indicator input and inputs measuring and exciting windings of the relevant sections. 2 Il.

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The invention relates to non-destructive electromagnetic methods for monitoring the parameters of ferromagnetic materials and can be used for multi-parameter monitoring of the electromagnetic properties of materials.

The purpose of the invention is to improve the accuracy of the converter due to the detuning from the influence of the oscillations of the air gap between the converter and the surface of the material under test.

FIG. Figure 1 shows the design of a matrix electromagnetic transducer; in fig. 2 - dependence of the output signals of the L / nz sections on the frequency of the balance fe.

Matrix electromagnetic transducer to control the physical and mechanical parameters of the ferromagnetic

materials consists of a U-shaped magnetowire 1. the length of which is evenly distributed sections, which are grouped in pairs of measuring and exciting windings 2, a generator of an excitation current (not shown), made with an adjustable frequency, a switch (not shown), whose contacts are connected with the output of the generator, the input of the indicator 3 and with the inputs of the measuring and exciting windings of the respective sections.

The Converter operates as follows.

The converter is mounted on the surface of the material under test and the exciter winding of the first section is connected to the generator with the help of a switch and the measuring winding is connected to the indicator.

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Changing the generator frequency, fix the value of the frequency in at which the voltage Ui from the measuring winding of the converter installed on the monitored material becomes equal to the voltage Ui1 from the converter without controlled material (Fig.2).

Then, using a switch, a generator and an indicator are connected to the exciting and measuring windings of the second section, etc., and thus the set of balance frequencies f2, fa fn is determined.

Using the required number of balance frequencies, which is determined by a particular practical task, one can determine several parameters of interest by the well-known method for multi-frequency multi-parameter control methods, for example, for the three known frequencies of the TB1 balance. f62, f & 3, depending on the measured parameter Pa and two suppressed parameters Pi, P Considering the relationship of the parameters with the frequencies linear, we can write

fi anPa ai2Pi + ai3P2.

T2 a2lPa + a22Pl + a23P2.

f3 a3iPa + a32Pi + a33P2. From the system for the measured parameter, we obtain

Rv

The values of coefficients facing the parameters are determined experimentally during the grinding of an electromagnetic converter.

Claims (1)

Matrix electromagnetic transducer for controlling the physicomechanical parameters of ferromagnetic materials, comprising a generator, U-shaped magnetic circuit, measuring and exciting windings, a switch and an indicator, characterized in that, in order to improve accuracy, the generator is adjustable frequency, measuring and the excitation windings are grouped in pairs in sections, sections are evenly distributed along the length of the drive radio. and the switch contacts are connected to the generator output, the indicator input and the inputs of the measuring and exciting windings of the respective sections. Fm.1 m About 6/2 1d 24 50 36 42 48 54 60 66 72 K Hz FIG. 2