Iron Core Inductor Research Articles

A Graphical Sinusoidal Analysis of a Nonlinear RC Phase-Shift Feedback Circuit

In certain nonlinear systems, a form of frequency response has been observed in which the peak is bent over to the right or left depending on the type of nonlinearity. It will be shown that a similar response may be obtained in the RC phase-shift feedback circuit by inserting a nonlinear resistor, such as a thyrite, in the feedback loop. This circuit is discussed with emphasis on a graphical sinusoidal analysis of some general applicability which predicts its frequency response. An informative physical interpretation is also obtained from the analysis of the triple-valued region in the response and of the jump phenomena. The method is essentially a graphical superposition of the voltageresistance characteristic of the nonlinear resistor upon the voltage-resistance characteristics (with frequency as a parameter) of the circuit between the two points where the nonlinear resistor is intended to be placed. The points of intersection satisfy both sets of characteristics, and therefore yield the response of the circuit. The method is also applied to a series RLC circuit containing a nonlinear iron core inductor, for which current-inductance curves are super-imposed.

Discontinuous Low-frequency Delay Line with Continuously Variable Delay

CONVENTIONAL low-frequency delay lines, built from capacitors and iron-cored inductors, show both linear and non-linear distortion. The linear distortion gives rise to dispersion, since the time delay depends on frequency. It is only possible to realize a time delay that is approximately constant over a limited frequency range1–3. The non-linear distortion is due to the iron-cored inductors. Only for signals that are sufficiently small is this distortion negligible. So the iron limits the allowable energy-level.

Analysis of transients and feedback in magnetic amplifiers

THE TERMS saturable reactor, d-c controllable reactor, transductor, and magnetic amplifier have been used to denote an iron-cored inductor in which the a-c impedance can be controlled by magnetically saturating the core with an auxiliary d-c winding. In this article, the term saturable reactor will be used to denote the iron-cored inductor itself, and the term magnetic amplifier will be applied to the entire circuit which makes use of the properties of the saturable reactor in order to amplify a signal. In many practical magnetic amplifiers, positive feedback is used to increase the amplification.

An Analysis of Transients and Feedback in Magnetic Amplifiers

THE TERMS saturable reactor, d-c controllable reactor, transductor, and magnetic amplifier have been used to denote an iron-cored inductor in which the a-c impedance can be controlled by magnetically saturating the core with an auxiliary d-c winding. In this article, the term saturable reactor will be used to denote the iron-cored inductor itself, and the term magnetic amplifier will be applied to the entire circuit which makes use of the properties of the saturable reactor in order to amplify a signal. In many practical magnetic amplifiers, positive feedback is used to increase the amplification.

A Note on Alternating Current Bridge Measurements on Iron-Cored Coils

A simple modification of the parallel resonant a.c. bridge is described which enables measurements to be made on iron-cored inductors under conditions of substantially sinusoidal flux variation at higher levels of induction than can normally be reached with conventional circuit arrangements.

Universal curves for D-C reactors

A D-C CONTROLLABLE REACTOR is an iron-cored inductor in which the a-c impedance can be varied over wide limits by magnetically saturating the iron with an auxiliary d-c winding. Because of its ruggedness, ease of control, and low losses, it has found continually wider application as a control device.

A Bridge Method of Measuring the Incremental Inductance of an Iron-Cored Inductor

A Bridge Method of Measuring the Incremental Inductance of an Iron-Cored Inductor

Subharmonics in circuits containing iron-cored inductors-II

This paper is an extension of the work reported in a paper of the same title by the writer and C. N. Weygandt. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> The production of subharmonic oscillations in a series circuit consisting of a capacitor and an iron-cored inductor is studied by the method of matching boundary conditions. The calculations are carried out by means of a new mechanical calculating device, and are verified by differential-analyzer solutions. A sufficient, but not necessary, criterion for stability is deduced. Some consideration is given to the effect of resistance in the circuit.

Subharmonics in circuits containing iron-cored inductors — II

This paper is an extension of the work reported in a paper of the same title by the writer and C. N. Weygandt. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> The production of subharmonic oscillations in a series circuit consisting of a capacitor and an iron-cored inductor is studied by the method of matching boundary conditions. The calculations are carried out by means of a new mechanical calculating device, and are verified by differential-analyzer solutions. A sufficient, but not necessary, criterion for stability is deduced. Some consideration is given to the effect of resistance in the circuit.

Transactions papers and discussions comprising pages 423–92 of the 1938 volume: Subharmonics in circuits containing iron-cored reactors

The performance of a series circuit consisting of a resistor, a capacitor, an iron-cored inductor, and a sinusoidal impressed voltage is specified by the non linear differential equation

Subharmonics in Circuits Containing Iron-Cored Reactors

The performance of a series circuit consisting of a resistor, a capacitor, an iron-cored inductor, and a sinusoidal impressed voltage is specified by the non linear differential equation dψ/dt + ri + L di/dt + 1/C∫i dt = E sin (t + θ) in which ψ is an odd function of i. Particular solutions of this equation, showing the effect of varying boundary conditions, are obtained by means of the differential analyzer. An approximate analytical method for determining the types of oscillations possible in this circuit is developed. Results obtained by this method are compared with differential analyzer solutions.