Abstract: A variable inductor provided with an inlet electrode and an outlet electrode, and including an inductive section having one end connected to the inlet electrode, electrically conductive moving equipment being provided with a moving contact for establishing a connection with the inductor section and being provided with means for connection to the outlet electrode, the inductor being wherein the moving contact is disposed in the proximity of the inductive section, with the connection therebetween is established by means of an electric arc.

Abstract: A multiple phase inductor includes a magnetic core having two end pieces and a plurality of legs extending between the end pieces to form flux paths which pass through the end pieces and the legs. Each leg includes a stack of "I" shaped laminations which are positioned between the end pieces to form two gaps in at least one of the flux paths. A coil is wound around each of the legs and all of the coils present substantially the same inductance to an external power circuit. By providing two gaps in each of the legs, localized heating of the turns of the coils is reduced.

Abstract: A coil has one or more layers of primary and secondary windings about a bore liner, with the primary and secondary windings separated by a winding of glass threads. The coil is heated in an oven to first drive off the volatiles of the binder forming part of the ceramic insulation for the primary and secondary coils and which volatiles pass through the winding of glass thread. The coil is further heated so that portions of the glass fibers forming the threads vitrify with the non-vitrified remaining portions retaining their well-defined, discrete fiber characteristics, whereby they extend through the vitrified glass to seal the coil, reinforce the coil against vibration and shock, and enable a dimensionally compact coil.

Abstract: An inductive device comprises a soft magnetic core which consists of two E-shaped core halves (1), each of which comprises three parallel limbs (5, 7) which are interconnected by a yoke (9). The core halves (1) are arranged against one another by way of the free ends of the limbs (5, 7), a coil former (3) being provided around the central limbs (7). The outer limbs (5) extend between an upper boundary plane (25) and lower boundary plane (27), which planes extend parallel to the longitudinal directions of the limbs (5, 7) and the yokes (9), the distance between said planes being determined by the height (x) of the outer limbs (5) which is greater than the height (y) of the central limbs (7).

Abstract: A transformer in which the tops and bottoms of both the primary and secondary coils are insulated from the magnetic circuit by substantially flat plate plastic insulators adjacent both the top and bottom of both coils.

Abstract: An electromagnetic induction device has coils of a plurality of phases and a duct through which a cooling medium is introduced into the coils to cool them. Guides are provided in the duct so asd to realize a substantially uniform distribution of the cooling medium to all coils. The flow rates of the cooling medium through the coils is substantially uniformallized so that the coils exhibit substantially the same temperature rise. As a consequence, any difference in the life between the coils is substantially eliminated.

Abstract: The invention is directed to an ignition coil for use in an internal combustion engine. The ignition coil includes a center core which has a plurality of core members aligned. At least one permanent magnet is disposed between the core members. A primary winding and a secondary winding are mounting on the center core and permanent magnet. The permanent magnet is enclosed in the primary winding at least. An outer core having at least one core member is disposed around the primary winding and secondary winding. One end of the outer core is connected to one end of the center core, wheras the other end of the outer core is connected to the other end of the center core.

Abstract: The invention is directed to an ignition coil for use in an internal combustion engine. The ignition coil includes a core having at least two parts between which a gap is formed. A primary winding and a secondary winding are mounted on the core in such a manner that the gap of the core is substantially enclosed in the primary winding at least. A permanent magnet, whose cross section is larger in area than the cross section of the core, is disposed in the gap of the core to form a substantially closed magnetic circuit with the core. Preferably, there are disposed a primary bobbin for mounting thereon the primary winding and receiving therein the permanent magnet, and a secondary bobbin for mounting thereon the secondary winding and receiving therein the primary bobbin with the primary winding mounted thereon.

Abstract: A folded conductive film winding transformer provides a plurality of poles and enables increased turns ratios or power handling capacity in structures which must meet severe height limitations.

Abstract: An integrated circuit transformer (58) which is constructed in a laminar hion is disclosed. The present invention includes a bottom plate (10) with cores (14) protruding from its upper surface (13) and a top plate (16) with several feed through holes (18). Both plates (10, 16) are made from high permeability magnetic material. Interposed between the top and bottom plates (10, 16) are at least one primary (19) and at least one secondary (40). The primary (19) has feed through holes (22), vertically aligned with the feed through holes (18) in the top (16), holes (20) to allow the cores (14) to protrude through, and tabs (26, 28) for connecting to the input circuit. The primary (19) is made of a laminate clad with an electrical conductor. The circuit which conducts the current around the cores is fabricated by etching special patterns of insulative gaps (24) into the electrical conductor. The secondary (40) has holes (42) to allow the cores (14) to protrude through.

Abstract: A cased transformer having a coil unit including a bobbin, primary and secondary coils and a cavity inside the bobbin, a core extending through the cavity, primary external connection terminals for leading two ends of the primary coil outside the case, secondary external connection terminals located on opposite sides of the case and having inner ends connected to two ends of the secondary coil inside the case and outer ends led to the outside.

Abstract: A winding construction for a transformer includes a single frame transformer core, an insulator layer, a primary winding, and a secondary winding. The secondary winding is wound with turns wound in a tilted arrangement on the single frame transformer core, whereby it can exhibit the same effects as the conventional partition or layer type transformer but without the need for an additional partition layer and achieves enhanced performance and reduced volume.

Abstract: A device for injecting an electromagnetic signal into a conductive cable to be tested, the device being generally cylindrical and having a central bore through which the cable passes. A plurality of concentric cylinders is arranged around the central bore, including an inner conductive cylinder, an intermediate ferromagnetic cylinder and an outer conductive cylinder. The inner and outer cylinders are connected at one end to a signal generator by coaxial cable, and are interconnected at the opposite end.

Abstract: In a superconductive coil assembly, superconductive wires are extended in a sheath tube which also defines a passage for allowing a liquid helium to pass therethrough. Sheath tube is housed in reinforcing vessel which comprises a pair of vessel segments and welded to each other. Reinforcing vessel is enclosed by a turn insulation and a earth insulation.

Abstract: Method for fabricating a laminated coil conductor for a high current coil which includes wrapping a layer of insulation around a rotatable shaped mandrel and then winding a plurality of copper sheets over the insulation as the mandrel is rotated. Solder is interposed between the copper sheets and between coolant tubes positioned on each end of each coil conductor. The assemblage is then removed from the mandrel and raised to a temperature to bond the copper sheets and coolant tubes together. The assemblage is then placed in a structural box and a plastic is injected into the box to fill any voids between the coil conductor and the box.An assembly of a plurality of coil conductors arranged in a high current coil according to the method is illustrated.

Abstract: A core for an integrated magnetic power converter includes a continuous magnetic structure having first and second legs and a magnetic flux conducting path therebetween. A primary winding is disposed on the first leg. A first secondary winding is disposed on the first leg. A second secondary winding is disposed on the second leg. The first leg has a cross-sectional area which is greater than the cross-sectional area of the second leg.

Abstract: An improved inductive device has a U-shaped ferrite magnetic core with a base and a pair of parallel legs integrally extending from the opposite ends of the base. A straight ferrite magnetic core is disposed between the opposed core legs to define airgaps respectively between the ends of said straight core and the legs. A winding is disposed to surround the straight core. Each of the core legs is formed to have a generally flush surface over substantially the entire length thereof such that the portion of the flush surface is cooperative with the end of the straight core to define the airgap.

Abstract: A high frequency power transformer having a multi-element magnetic shield conforming to the surface of the structure including provisions for specific features of the magnetic circuit and winding assembly. The winding is disposed on one side of a four-sided magnetic circuit and is partially surrounded by a close fitting electrically continuous loop. The winding assembly includes an area having a higher electrostatic field and is surrounded by a second electrically continuous loop which is spaced apart from the winding assembly, providing significant electrostatic shielding and air movement over the winding assembly while avoiding arcing between the shield and the winding assembly due to the high electrostatic field.

Abstract: Disclosed is an engine igniting coil device which comprises a plurality of coil units arranged in a case and unitarily potted therein with thermosetting resin, and is characterized by that a core portion of each coil unit is covered with a core cover, a coil base is mounted in the case to enclose portions of the core covers extruding from the coil case and inner space of the coil case is divided by partitions to separately accommodate coil units, thereby a required amount of resin for potting is reduced and thermal crack resistance of the resin potions is increased.

Abstract: There is disclosed a current limiting electrical reactor that efficiently uses space. The reactor includes a supporting core with a circular periphery where the conductor is wound about the periphery of the coil in a convoluted spiral that spirals laterally out from the periphery of the core over itself, and lies in a radial plane passing through the core. A first terminal, adapted for electrical connection, is positioned at the beginning of the innermost turn of the conductor. A second terminal, also adapted for electrical connection, is positioned at the end of the outermost turn of the electrical conductor. Insulation is provided between adjacent turns of the conductor. This reactor configuration provides an electrical path along the conductor between the first and second terminals having a current limiting reactance.