An electric power apparatus, namely a variable inductor comprising a magnetic core provided with a center limb and two outer limbs all having first and second ends. The first ends are interconnected through a first common point of the magnetic core, and the second ends through a second common point of this core. Two primary windings disposed respectively around the two outer limbs are connected in series and supplied with an alternating current, while two control windings also connected in series are respectively superposed to the two primary windings. The alternating current of the primary windings is rectified through a diode bridge for supplying with direct current the control windings. The direction of the different windings along with their interconnections are selected so that the alternating and direct currents induce in one of the two outer limbs alternating and direct current magnetic fluxes which assist each other or which are in opposition and in the other of these two limbs alternating and direct current magnetic fluxes which are in opposition or which assist each other, respectively, depending on the positive or negative value of the alternating current. Each outer limb comprises an air gap traversed by the resultant magnetic flux induced in this limb, and preferably disposed in the center of the corresponding primary and control windings.

Self-controlled variable inductor with air gaps

An AND function gating circuit for A.C. signals comprising several magnetic circuits around a common limb, each circuit having a separate input winding and a single output winding on the common limb. The magnetic flux level in the common limb is greatly increased when all input windings are simultaneously energized by A.C. signals of the same frequency and in phase relative to the output achieved under other input signal conditions.

Circuit using a multi-path magnetic core with common output limb

Power supply control and connecting system

A duplex reactor having two inductively coupled working windings connected in series opposition. The windings having a common output lead connected to a power source and respective output leads connected to consumer loads. A member which controls the mutual inductance of the working windings is arranged on a magnetic core.

Twin reactor employed for voltage stabilization in power plants

A reconfigurable coupled inductor is disclosed In one embodiment, the reconfigurable coupled inductor comprises metal rings and switches coupled to the metal rings to control at least one inductor property (eg, coupling coefficient) based on a closed (eg, on) or open state (eg, off) of each switch

Theodore F. Maka

Papers

Ac power regulator with magnetic amplifier