SU1415167A1 - Eddy-current parametric converter - Google Patents

Abstract

The invention relates to non-destructive testing of products at highly varying ambient temperature conditions. The aim of the invention is to increase the conversion accuracy by increasing the temperature stability of the converter. Three identical converter windings are connected in series, two of which are connected in opposite, and the capacitance, the value of which is chosen from the condition), where h is the frequency of the converter power supply, and LS is the inductance of the third winding, ensure the purely active nature of the converter resistance. Significant temperature changes in the environment in which the transducer is located cause the same changes in the active resistances of the windings, but this is an informative parameter, as which the choice, but the ratio of the voltage on the oppositely connected windings to the voltage on the series oscillatory circuit, changes there will not be. A change in the parameters of a controlled object will lead to a change in voltage on the oscillating circuit and, accordingly, to a change in the output parameter. 1 il. (L

Description

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ABOUT)

The invention relates to the field of non-destructive testing of materials and products and can be used in power engineering, mechanical engineering and other areas of control of products under conditions of a strongly varying temperature of the surrounding medium and the object of control.

 The aim of the invention is to improve the accuracy of the conversion by increasing the temperature stability of the converter.

The drawing shows an electrical converter circuit.

10 kah 1 and 2 to the voltage V-i on the series oscillatory circuit. Significant temperature changes in converter windings 1–3 cause the same changes in the internal resistances of each winding, but the information parameter does not change. Thus, the output parameter of the converter does not depend on changes in ambient temperature. When the parameters of the object being monitored are changed for example: The converter contains consecutively connected (identical windings 1–3 and capacitance 4, and winding 3 and capacitance 4 form a series resonant circuit; windings 1 and 2 are connected oppositely. The converter is connected to the output of ipaTOpa 5 sinusoidal oscillations. The windings 1–3 are made by simultaneously 20 remaining unchanged due to the mutual winding of the three wires for one compensation of the signals of windings 1 and 2,

| Frame voltage Иг varies depending on the Converter operates, as follows from the nature of the change parameters

way.

Claims (1)

I The voltage from the output of the generator 5 is supplied to the converter. Moreover, its 25 Formula of invention; frequency and value of capacitance 4 are a sub-Eddy current parametric converter containing two windings connected in series oppositely, characterized in that, in order to increase the accuracy, so that capacitance 4 is formed and coil 3 forms a series resonant circuit, i.e. thirty WITH Si-la where O) is the frequency of the generator 5; LS - winding inductance 3. Since windings 1–3 are made. G all windings are made by means of one and the same by means of simultaneous winding of three wires onto one conversion, it is provided with series-connected third winding and capacitance, forming a series oscillatory circuit connected in series with the first two windings, and coils of three wires, then quantities self-inductances and mutual induction coefficients are close in magnitude to each other. Sequential counter-switching of windings 1 and 2 and the fulfillment of the resonance condition for elements 3 and 4 provides a purely active resistance character of the entire converter. As an informative parameter of the converter, the junction ratio f / i on the oppositely connected windings 1 and 2 to the voltage V-i on the series oscillatory circuit is used. Significant temperature changes in converter windings 1–3 cause the same changes in the internal resistances of each winding, but the informative parameter does not change. Thus, the output parameter of the converter does not depend on changes in ambient temperature. With changes in the parameters of the object being monitored, it remains unchanged due to the mutual compensation of signals from windings 1 and 2, An eddy current parametric converter containing two windings connected in series oppositely, characterized in that, in order to increase the point conversion, it is provided with series-connected third winding and capacitance, forming a series oscillatory circuit connected in series with the first two windings, and frame.