Abstract: A split-flux transformer has a primary or input coil, at least two secondary or output coils, spaced apart and arranged in 3D, a magnetic core running through the primary and secondary coils, a source of electricity connected to the primary coil which when turned on creates a magnetic field in the core, and electrical wires connected to the secondary coils, each of which provides additive electricity into an output circuit.

Abstract: A magnetic element includes a first magnetic core, a second magnetic core, an intermediate magnetic core, a first winding coil, and a second winding coil. The intermediate magnetic core is arranged between the first magnetic core and the second magnetic core. After the first magnetic core and the intermediate magnetic core are coupled with each other, a first winding space and a first air gap are defined. After the second magnetic core and the intermediate magnetic core are coupled with each other, a second winding space and a second air gap are defined. The first winding coil is disposed within the first winding space and arranged around the first air gap. The second winding coil is disposed within the second winding space and arranged around the second air gap. The first winding coil and the second winding coil are connected with each other in series.

Abstract: A static apparatus includes an iron core which includes a plurality of magnetic plates stacked in one direction and in which a shaft portion having a main surface and a side surface is formed, and a coil wound around the shaft portion. Slits extending in an axial direction of the shaft portion are formed in at least a surface layer magnetic plate constituting the main surface, of the plurality of magnetic plates. Some of the slits are formed in the main surface, at an end portion close to the side surface, at a predetermined formation density. The formation density of the slits is highest at the predetermined formation density, and is reduced as at least one of a minimum distance from the side surface within the main surface and a distance from the main surface on a side close to the slits in the stacking direction is increased.

Abstract: An inductive component has a winding and a core that includes a plurality of core areas that contain different magnetic materials.

Abstract: A reactor comprises a reactor core in which two U-shaped core members are connected in a ring shape with a gap section therebetween, a primary insert-molded resin part provided covering at least an outer peripheral surface of a leg part of the core member other than an adhesion surface of the core member, a coil placed around the gap section and the leg part of the core member, and a secondary insert-molded resin part made of a thermoplastic resin and which is insert-molded around the coil to fix the coil on the reactor core and fix the leg parts of the core members in a connected state. A positioning section which determines a relative position of opposing leg parts and a window section which allows a melted thermoplastic resin for forming the secondary insert-molded resin part to flow into the gap section are formed on an end of the primary insert-molded resin part connected in a state where core members are placed connected in a ring shape.

Abstract: The invention relates to a step switch provided with a preselector and a polarity circuit, a separate polarization resistance being respectively provided at the beginning and the end of the stepped winding. Optionally, the two polarization resistances can be connected continuously or via separate polarity switches.

Abstract: A ripple reduction circuit for use in a current doubler rectifier has first and second inductors coupled via a first coupling coefficient. The first and second inductors generate a first and a second ripple current, respectively. A third inductor is coupled to the first and second inductors; and an impedance is connected in series with the third inductor, wherein the circuit generates a third ripple current opposing the combination of the first and second ripple currents generated by the first and second inductors.

Abstract: An electromagnet having at least one access port oriented perpendicularly to the electromagnet's central axis. The magnet has a conventional helical winding along its central axis. However, at some point along the length of the axis, the pitch of the helical winding is greatly increased in order to create a region with a comparatively low turn density. One or more ports are provided in this region. These ports provide access from the magnet's central bore to the magnet's exterior. A sample can be placed in the central bore near the ports. A beam traveling down the central bore, or through one of the radial ports, will strike the sample and be scattered in all directions. The ports allow access for instrumentation which is used to evaluate the scattered beam.

Abstract: A switching power supply includes: a first series circuit, connected to both terminals of a direct current power supply Vdc1, in which a primary winding 5a of a transformer T, a reactor L3 and a first switch Q1 are connected in series; a second series circuit, connected to both terminals of the primary winding 5a and the reactor L3, which includes a switch Q2 and a capacitor C3; a smoothing circuit D1, D2, L1, C4; and a control circuit 10 alternately turning on and turning off the switches Q1, Q2. The transformer T includes: a main core 21, formed with a magnetic circuit, on which the primary and secondary windings 5a, 5b are wound with a given gap 23; and a plurality of auxiliary cores 24a, 24b disposed in the given gap 23 with a given distance in a circumferential direction of the primary winding 5a. Further, the reactor L3 is formed of a leakage inductance of the transformer T.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A filter uses a special autotransformer that has a ferromagnetic core with a plurality of legs and flux return bars. A first coil is located on one leg, and a second coil is located on the same leg, but spaced from the first coil. The first coil and at least part of the second coil are connected in series to receive distorted alternating current and at least that part of the second coil is connected to an output terminal. Between the coils and extending at least part of the way from the first leg to an adjacent leg is a magnetic shunt assembly to divert part of the flux generated in the first coil by the alternating current so that that part does not link with the second coil. An air gap is located to link with the second coil to create an inductor in that coil by flux in the second coil, and a capacitor is connected across the second coil to tune it to the fundamental frequency of the alternating current and substantially reduce harmonics in that current.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A magnetic core has an open magnetic path and includes a magnetic body forming the open magnetic path and having a soft magnetic property, and a permanent magnet at least at one end of the magnetic path of the magnetic body. A coil assembly includes the magnetic core having the open magnetic path. The magnetic core includes the magnetic body forming the open magnetic path and having the soft magnetic property. The coil assembly also includes the permanent magnet at least at one end of the magnetic path of the magnetic body, and at least one coil having at least one turn wound around the magnetic core. A power supply circuit includes the coil assembly. The coil assembly includes the magnetic core having the open magnetic path. The magnetic core includes the magnetic body forming the open magnetic path and having the soft magnetic property.

Abstract: An electromagnetic apparatus having an adjusting effective core gap includes: (a) an electrical winding; and (b) a ferrous core situated proximal with the electrical winding. The core has a first terminus and a second terminus arranged in spaced relation to establish a gap distance between the termini in a region in substantial register with the termini. The winding and the core cooperate to establish an inductance related with an electrical current applied to the winding. At least one terminus of the termini has a configuration responsive to varying the current by effecting selective local saturation of successive portions of the at least one terminus for successive values of the current. The selective local saturation establishes successive new effective gap distances. Each respective new effective gap distance is appropriate for establishing a successive new optimum inductance for the current value then extant.

Abstract: The gap-providing ferrite core half is produced by grinding an abutting surface of a ferrite core half by a rotating grinder with a rotation shaft inclined by 0.

Abstract: A transformer, comprising: a closed ferrite magnetic circuit having an air gap; a rigid component filling a portion of the air gap; and, a flexible material filling the remainder of the air gap to substantially absorb vibrations of the ferrite. In the case of air gaps greater than approximately 1 mm, the flexible material fills approximately 1 mm of the air gap and the rigid component fills the remainder of the air gap. The rigid component may be of non magnetic, synthetic resin material. The flexible material may be a one component mastic, for example polysulfur, polysulfate polysulphide or polyurethane. The flexible material may also be a silicone type mastic, for example a neutral silicone.

Abstract: A planar-type magnetic structure in which two coils, on two poles of the same core, are separated by an open space which is wide enough and low enough that the air return flux, through the open space, completes the flux circuit for each coil. Thus the coupling coefficient between the two coils is very small, even though they are both mounted on a single continuous core of high-permeability material.

Abstract: A method for manufacturing an inductor with resonant frequency and Q value increased in semiconductor process can reduce substrate coupling effect, because (an) air layer(s) is/are formed just under a spiral metal layer which functions as an inductor. In addition, part of the substrate material still remains around the air layer(s), which can be used as a support for the spiral metal layer. Therefore, a problem causing the above-mentioned spiral metal layer to collapse will never occur.

Abstract: Plane sheets which have the same shape as the magnetic circuit and are relatively movable along their contact surface are arranged in a stack. The stack is grasped and part of the circuit is bent out of alignment with the plane of the sheets to enable a coil to be placed on a portion of the circuit which is next to the air gap, whereafter said part is bent back into alignment with said sheets.

Abstract: Embodiments of the invention include a transformer device having a saturation region for limiting ingress noise and other noise. The transformer comprises a magnetic core, an input coil and an output coil arranged so that the output signal caused by the magnetic linkage between the input and output coils through the magnetic core is based on the magnitude of the input signal. According to an embodiment of the invention, the magnetic core includes a saturation region that limits the output signal regardless of the magnitude of the input signal once the saturation region reaches its saturation magnetization state. The saturation region comprises a reduced saturation magnetization level caused by a geometrically constricted region of the magnetic core or, alternatively, by a modified, magnetic-equivalent region having properties similar to a geometrically constricted region.

Abstract: A static magnet dynamo including at least one permanent magnet having different poles; a first core comprising a soft magnetic material and which couples the different poles of the permanent magnet to form a closed magnetic path therein; a second core comprising a soft magnetic material which couples to the closed magnetic path via a paramagnetic material to form an open magnetic path; a magnetized coil wound around a portion of the first core where the closed magnetic path is formed; and an induction coil wound around a portion of the second core. A direction of a flux of the closed magnetic path is changed by applying an alternating voltage to the magnetized coil, generating an electromotive force in the induction coil by electromagnetic induction due changes in a flux of the open magnetic path induced by the change in direction of the flux of the closed magnetic path.

Abstract: An AC ferroresonant transformer includes a core having a closed loop path and a magnetic shunt assembly extending between portions of the core. A primary winding, a secondary winding and a tertiary winding are disposed on the core to link with magnetic flux in the core and the magnetic shunt. The tertiary winding includes terminals that are electrically isolated from the secondary winding. A first aspect of the present invention includes a tank capacitor connected to the tertiary terminals to form two LC circuits wherein a first LC circuit is a resonant circuit and a second LC circuit is a filtering circuit. Another aspect of the present invention is a method of operating an AC ferroresonant transformer proximate a knee of a B-H curve of the core, at minimal line voltage and full load, to reduce the generated harmonics.

Abstract: A fluorescent lamp ballast utilizes a single a transformer for providing both tank inductance and current mode feedback to the ballast driver circuitry. The transformer has an "EE" core with inductor windings on the center legs and gate windings on one of the outer legs. The center leg is gapped to avoid magnetic core saturation and to adjust inductance to a desired value. Coupling can be adjusted further by gapping one or the other of the outer legs.

Abstract: An adjustable asymmetric available saturation flux transformer for a horizontal deflection circuit of a CRT. The transformer includes a core having an asymmetric form, a linear compensation coil and a magnetic saturation control coil. The linear compensation coil is connected in series with a deflection coil of the horizontal deflection circuit. A current of the linear compensation coil can be adjusted to vary a current of the magnetic saturation control coil, so as to attain different effects of compensation as desired.

Abstract: A multi-cathode electron beam plasma etcher is disclosed. The multi-cathode electron beam plasma etcher is comprised of: a vacuum chamber; several cathodes which are installed in the upper end of the upper part of the chamber and generates an electron beam in order to generate plasma in a large area; an acceleration electrode and a deceleration electrode which, form an acceleration and a deceleration tube structure in order to withdraw much of the electron beam, are arranged sequentially from the front of the cathode, and form an electrostatic lens when the differential voltage is applied respectively; first vacuum evacuation device to made the upper part of the chamber vacuum; an etching gas injection device which is installed in the side wall around the upper end of the lower part of the chamber; second vacuum evacuation device which is installed in the lower part of the chamber; and a holder of the etched body which is installed in the lower part of the chamber.

Abstract: In a prefer embodiment, an integrated transformer and inductor on a singe core structure to provide an impedance matching function and an inductor in series with the transformer's secondary which includes: a transformer core structure having a primary leg, a secondary leg, and a center leg containing an air gap, said center leg disposed parallel to said primary leg and secondary leg, whereby said air gap provides control of said inductor value; a primary winding on said primary leg; and a secondary winding on said secondary leg.

Abstract: A high-voltage transformer for a television display device having a core made of two core parts. One end of a core limb is chamfered or rounded on the outside such that the contact region is distal from the outer edge of the core limb. The end of the core limb is preferably provided with a bevel.

Abstract: A transformer to achieve a precise amplitude for the operating voltages produced by the auxiliary windings, and such that the construction and production of the transformer are simplified. An auxiliary winding is split into a plurality of winding elements disposed in different chambers of a chamber-type coil former. One of the chambers is disposed in the region of the air gap of a U/I core or of a U/U core, the two U-core halves having parallel limbs of different lengths.

Abstract: A two-winding, integrated-magnetic EMI filter provides damped common-mode and differential-mode inductances. The preferred embodiment of the filter has a magnetic core structure that incorporates a high-permeability C-core, a high-permeability I-core, and a low-permeability, lossy shunt. The three core pieces are assembled so as to form a structure that, similar to an E-I configuration, has two winding windows. The loss in the shunt aids in dissipating noise and it diminishes the effects of unwanted parasitic resonances by providing damping for the differential-mode inductance. Damping for the common-mode inductance is provided by losses in the C and I core pieces. Varying the reluctance of the shunt allows the differential-mode inductance to be adjusted separately from the common-mode inductance in order to tune the filter to remove desired noise frequencies. Another embodiment of the invention incorporates a high-permeability toroid core and a low-permeability, lossy shunt.

Abstract: A trip device comprises at least one current transformer for supplying power to electronic circuits. The current transformer comprises a magnetic circuit, surrounding a primary conductor, a secondary winding wound onto a part of the magnetic circuit forming a core, and a magnetic shunt branch connected on the magnetic core. The magnetic shunt comprises an air-gap. When the current flowing in the primary conductor is of low value, the magnetic flux stopped by the air-gap flows essentially via the core of the secondary winding. At high current levels the induction is greater and a large part of the magnetic flux passes through the shunt via the air-gap. The current transformer has a non-linear current response which limits excess power supplied to the electronic circuits and dissipated in the transformer. The trip device is useful, for example, in a circuit breaker.

Abstract: In a converter which is usable as a kind of DC--DC converter and which comprises a transformer for processing an exciting current into an excited current under influence of an inductance value of the transformer, the inductance value is controlled in compliance with a value of the exciting current. The exciting current is controlled by a current control circuit with reference to the excited current so that exciting current is intermittently supplied to the transformer. While the exciting current is absent during intermittent supply to the transformer, the transformer produces the excited current.

Abstract: A transformer or inductor is made by wrapping a magnetic core material about a toroid-like structure made up of one or more electrical windings. A ferroresonant transformer may be constructed by including a slotted washer between primary and secondary windings. By shorting one of the windings, the ferroresonant transformer can be made into a gapped inductor with the gap totally enclosed within the core.

Abstract: An operator controllable transformer having a shunt magnetic path with a control coil is provided. The transformer includes phase control circuitry to control the output of the transformer by phase controlling current flow in the shunt coil, thereby controlling the flux through the shunt magnetic path and the flux coupling with the secondary coil. Power for the control circuitry is derived from the current induced in the shunt coil.

Abstract: An electrical circuit is provided for operating a combination insect electrocution grid and outdoor lamp. The circuit of the invention utilizes a high leakage reactance transformer in which a primary coil and two secondary coils are wound on a common core, the primary coil is centrally situated and the two secondaries are situated on opposite ends of the primary. A magnetic shunt is provided in the transformer between the primary and the high voltage secondary coil. A peaking capacitor, selected to induce the power frequency to resonate at the third harmonic, is connected to the high voltage secondary coil to generate the high voltage which energizes the electrocution grid. The other secondary coil is a ballast secondary which energizes the illumination means.

Abstract: A magnetic leakage transformer includes a paired cores each having five straight legs extending in the same direction from a common back beam, and associated with each other so that the leg's ends are opposed to each other with magnetic gaps between the paired central legs and between the two paired magnetic leakage flux legs neighboring at the both sides of the central legs. The opposed two paired five legs produces a paired inner passages into which a first winding unit is inserted and a paired outer passages into which a second one is inserted.

Abstract: A ballast assembly for a fluorescent lighting fixture includes a magnetic core, a primary winding and a secondary winding, both windings mounted on a central leg of the core, with a shunt disposed between the windings to prevent a flux generated by the primary winding from coupling with a flux generated by the secondary winding. The ballast further includes means for securing the shunt comprising a wall placed between the windings, with the wall having one or more structures formed integrally on the wall for engaging the shunt. The wall may comprise a flange of a bobbin, or be free standing. Using formed structures eliminates the need for winding tape around the shunts to provide an air gap between the sunt and the core. This assures long-term stability and reduces the potential for nuisance humming.

Abstract: An AC line filter in which a pair of windings are wound in an opposite dition to each other and are provided at opposing locations on a main core that forms a closed magnetic path. At least one auxiliary core which forms a shorter magnetic path than the main core is positioned adjacent the main core. The auxiliary core has at low frequency region an effective permeability higher than that of the main core. A portion of each of the pair of windings being provided in such a way that the portion is a concentrated winding which surrounds both the main core and the auxiliary core simultaneously.

Abstract: The invention is directed to a transformer having notch gaps extending partially across the flux path of the transformer core and having a total gap volume which stores sufficient magnetic energy to substantially eliminate inductive voltage spikes in a clipped sinusoidal waveform applied to the primary of the transformer. As used in a low voltage lighting system in which the intensity of a filament lamp is regulated by a dimmer control which selectively clips the voltage applied to the transformer primary winding by an ac source, the invention substantially eliminates filament ringing.

Abstract: A shunt latch for a core-coil of a fluorescent light ballast comprising a substantially U-shaped metal shunt which is positioned in a shunt-receiving compartment defined by a pair of adjacent flanges. The adjacent flanges are provided with barb-like protrusions which permit the shunt to be inserted into the shunt-receiving compartment but which prevent the shunt from shifting from within the compartment or moving outwardly therefrom.

Abstract: The invention provides an electric transformer for microwave ovens including a conventional magnetic circuit with three columns, and electric circuits insulated by carcases and covers made from an insulating material. The secondary carcase forms a particular housing for the secondary heating winding so that the secondary high voltage winding and the secondary heating winding are partially superimposed. Thus an excellent electric insulation is provided without loss of space.

Abstract: An energy convertor for generating a power output waveform that contains a fundamental sine wave and a controlled amount of the third harmonic wave to eliminate the sinusoidal peaks and to provide a desired flat top at reduced amplitude. The synchronized generation of the third harmonic is achieved in combination with a new inductor that enhances the harmonic in the magnetic path around the inductor.

Abstract: A variable-ratio transformer for arc and plasma setups, comprising a magnetic core made up of a main part composed of two yokes and legs in accordance with the number of phases and an additional part disposed on the side of the yoke of the main part of the magnetic core. The additional part of the magnetic core is made up of a yoke and legs whose number is equal to the number of the legs of the main part, at least one leg being placed with a gap in relation to the first yoke of the main part. The primary winding of each phase comprises two series-connected parts, the first part being located on the main part of the magnetic core, while the second part is located on the additional part thereof. A controlled electronic switch which regulates the load current flowing through the secondary winding of each phase, disposed on the main part of the magnetic core, is connected in parallel to one of the parts of the primary winding of each phase.

Abstract: Coil bobbins are disclosed having flanged coil support portions provided with outboard terminal housings projecting beyond the flange rim and defining inwardly extending terminal-receiving cavities. The end walls of the housings are slotted to allow a wire to pass through the cavity in a circumferential direction relative to the winding axis in similar fashion to a turn of coiling. Bifurcated terminals pressed into the cavities in straddling relationship to the wire provide connections to the coil.A double bobbin has twin flanged coil support portions with bridging sections maintaining their physical separation. Terminal housings are provided on the bridging sections allowing wire to be first wound into a coil on one support portion, guided across the bridging section and passed through the cavity in a terminal housing, and then wound into a coil on the other support portion, all without interruption.

Abstract: A single electromagnetic structure comprising a pair of assembled oppositely positioned pot cores, first and second winding means around each of the pedestals of the cores, and a flat magnetically permeable washer-like member positioned between the windings and spaced from the pedestals and the outer annular rim portions of the pot cores to define a pair of air gaps, whereby the apparatus functions like a transformer and an inductor in series with a winding of the transformer.

Abstract: A circuit containing a ballast for one or more fluorescent lamps. The circuit includes a first inductor in series with a voltage input terminal and a first capacitor to form a series resonant circuit to provide a starting voltage to the lamps. A second, shunt inductors coupled between the first inductor and the capacitor and another input terminal of the circuit to eliminate the high Q of the series resonant circuit and prevent the first inductor from saturating. The inductors are mounted on the legs of an H-shaped core to provide inductive coupling between the inductors and allow a maximum winding area for the first inductor to reduce the series resistance of the lamp current path. The core also allows the shunt inductor to adjust power line power factor independently of lamp power factor. Improvements in system efficiency of up to 15% can be achieved over conventional core/coil type ballasts.

Abstract: An electrical transformer comprises a hollow form exhibiting high magnetic permeability and interior projections extending between separable halves of the form to provide a low magnetic leakage transformer core. Primary and secondary windings are disposed around the central projections. Furthermore, there is included means internal to the form for providing a lower permeability magnetic circuit shunt path. The internal shunt path means is typically either a cylinder or disc structure. A reduction in stray magnetic flux is desirable since it means that smaller, less expensive transformers may be constructed. The transformer of the present invention is particularly useful in electronic ballast circuits for gas discharge lamps because the magnetic shunt path acts as a current-limiting inductor. Moreover, since the transformers of the present invention do not generate external magnetic fields, flux shields are not required to maintain high efficiency.

Abstract: A discharge lamp ballast for stabilizing wattage input into a discharge lamp at different levels in two or more ranges comprises a magnetic core forming a closed magnetic circuit. A main winding on the core may be used alone or with an extended winding switched in series, and be connected in series with the lamp across an alternating current source in a lamp operating circuit. A control winding on the core has a triac connected across it to vary the current and thereby the wattage supplied to the lamp in the operating circuit. A pair of gapped shunts, one located between the control winding and the extended winding, and the other between the extended winding and the main winding, assure a proportionally greater control effect on the series reactance in the lamp operating circuit when the extended winding is switched in than when it is not.

Abstract: An inductor having an air gap in its magnetic core is provided with a magnetic shield which surrounds the inductor air gap to not only reverse bias the inductor magnetic circuit so as to increase the amount of current required to achieve inductor saturation but also to return any stray flux radiating from the inductor back into the inductor magnetic circuit to reduce the radiated electromagnetic interference.