Abstract: A microwave oven includes a magnetron generating microwaves which are irradiated onto food for heating the same, a circuit substrate incorporating an electric circuit for driving and controlling the magnetron, circuit means for generating both an electrical alarming signal and a high-frequency electrical signal, and a sound producer producing an alarming sound regarding a heating operation when supplied with the alarming electrical signal and producing ultrasonic waves for the repelling of insects when supplied with the high-frequency electrical signal.

Abstract: A compact, wide range inductor capable of being trimmed to a desired frequency value, comprising at least two individually tunable inductive elements of different resolution, disposed upon an insulative support. The inductor is usually placed within a hybrid circuit and trimmed after component population.

Abstract: A low loss composite spider arrangement for use in inductive electrical epment and an air core reactor incorporating the same in which a non-conductive or a conductive material having very low relative permeability and relatively high resistivity is used to fulfill the mechanical and structural requirements of the spider, and a relatively small amount of electrical conducting material, bonded to and preferably electrically isolated therefrom, is used to fulfill the electrical requirements of the spider.

Abstract: A transformer having a barrel winding comprised of flat conductive film conductors is provided with a repeatable winding configuration by employing a dielectric metal laminate as the winding material and by patterning both primary and secondary windings on the same dielectric membrane, thereby fixing the relative positions of the primary winding and secondary winding terminals and conductors.

Abstract: A line filter arranged in such a manner that a foil conductors are used as the coil conductor and the shield plate, and a reactor is formed therein by laminating and winding the foil conductor and the shield plate with an insulating material held therebetween. A line filter arranged in such a manner that a pair of coil blocks connected to each other in parallel is provided on the iron core leg is included in the scope of the invention. Each of the coil blocks is structured in such a manner that the coil conductor and the shield plate made of the foil conductors are stacked and wound via the insulating material. A structure is included within the scope of the invention, the structure having a plurality of filter mechanisms connected to one another in series, each of the filter mechanisms being constituted by a pair of coil blocks connected to each other in parallel.

Abstract: Turns of primary and secondary windings of a chopper power supply transformer are formed by magnetically coupled stacked parallel planar printed circuit conducting layers. The primary winding is between first and second parts of the secondary winding that are connected in series and parallel. Layers at opposite ends of the primary winding are (i) arranged to reduce leakage currents between the secondary winding parts and (ii) positioned between further layers of the primary winding and the secondary winding. Terminals of the first and second layers are connected together as a first input terminal of the transformer. Other terminals of the first and second layers have a common connection. Further layers of the primary winding are connected in series with each other between the common connection and a second input terminal of the transformer.

Abstract: The transformer comprises an annular core (1) of a soft-magnetic material on which there are provided a first winding and a second winding. The second winding comprises n turns more than the first winding. The first winding consisted of a first conductor (3) and a second conductor (5), the second winding consisting of a third conductor (7). The three conductors (3, 5, 7) are twisted over a part of their length so as to form a cable (9) wherefrom a common winding is formed which includes at least a part of the second winding and substantially the entire first winding. Near one end of the common winding there are provided n additional turns of the first conductor (3) and near its other end there are provided n additional turns of the second conductor (5). The corresponding end portions of the first and second conductors (3, 5) are electrically interconnected in order to form terminals (13, 19) of the first winding, and the end portions of the third conductor (7) form terminals (11, 15) of the second winding.

Abstract: A welding transformer for use in a resistance welding machine has primary and secondary coils. The primary coil includes a plurality of spaced juxtaposed coil units mounted on a base board. Each of the coil units includes a plurality of juxtaposed coil unit elements with insulating members interposed therebetween. Each of the coil unit elements includes a plurality of turns of a conductive member, and a plurality of conductors mounted on the base board and electrically interconnecting the coil unit elements. A pair of cores is combined with the coil units.

Abstract: A hybrid high voltage transformer includes three nesting cylindrical coil forms. The inner coil form supports a primary winding and the two outer coil forms support secondary windings that substantially overlie the primary winding. Each of the secondary winding coil forms includes a plurality of circumferential walls forming individual compartments for supporting a multilayered group of coil turns in a substantially uniform pattern over the coil form. The outer coil form includes an upraised central portion to permit tapping of the secondary winding thereon for a DC focus voltage at AC ground. The coil forms include protrusions for supporting connection posts for making electrical connections and supporting electrical components. The two secondary windings are wound in opposite directions.

Abstract: A variable transformer is disclosed. The transducer includes a uniform pitch winding wound on a hollow bobbin with several continuously variable concentric coils wound over it with layers of insulation in between. The variable coils are wound in accordance with true trigonometric functions by adjusting the pitch between adjacent turns and reversing the direction of winding at each maximum pitch point corresponding to the zero crossover. The variable pitch coils are physically wound in quadrature with respect to a reference point on the bobbin. The transducer is finished by placing a magnetic shield over the bobbin which may include magnetic end washers. Lead wire connections are made and the entire unit is placed in a suitable housing. A moveable core, made from a highly permeable material, is placed inside the unit for slidably engaging the bobbin in its hollow.

Abstract: At least two three-phase transformer arrangements include a plurality of primary windings connected in a wye configuration and at least two converter arrangements, each converter arrangement comprising a plurality of secondary windings connected in a double-wye configuration. A separate rectifier is connected in series with each secondary winding of each converter arrangement.

Abstract: An inexpensive autotransformer assembly adapted to withstand and operate under stingent conditions for permitting the flow of a fluid in both the axial and radial directions therethrough to cool both the core and the windings is disclosed. A first embodiment comprises an autotransformer assembly having a core and at least two groups of windings spaced apart thereon. The core includes a central cooling channel and a plurality of radial channels extending outwardly from the central cooling channel and terminating at openings in the outer surface of the core. A second embodiment comprises an autotransformer assembly having a core and at least two groups of windings thereon. A plurality of longitudinal spacers disposed on the outer surface of the core serve as a means for spacing the windings from the core in order to provide an axial coolant path along the outer surface of the core.

Abstract: A radio frequency choke for a cable or CATV system is designed for blocking signals from 5 to 1000 MHz and passing 60 Hz AC power. The RF choke has a wire coil that is wound upon a coil form of a predetermined cross section, the coil being formed of a number of successive spaced windings on the form, with each winding being joined to the next by an air coil of at least one turn, formed off the loop. The various successive windings should have different numbers of turns. Forming the air coils tends to tighten the windings onto the form, so that a fixative coating or adhesive can be eliminated or omitted.

Abstract: An air core reactor of the type having a plurality of coaxial coil windings connected electrically in parallel by structurally rigid spiders at opposite ends of the reactor. There are two electrically conductive spiders at least one end of the reactor. Selected ones of the coil windings are connected to one of the two spiders and further selected ones of the coil windings are connected to the other of the spiders at the one end. In the preferred form the windings connecterd offset from one another around the coaxially disposed coils. In a further preferred embodiment, there are two electrically conductive spiders at each of opposite ends of the coaxial coils. In a still further preferred form, at least some of the coil windings are wound at least two conductors high with the same number of turns and wherein the ends of said two conductors are circumferentially offset from one another by preferably 180.degree..

Abstract: A compact circuit breaker containing an electronic trip unit for interrupting overcurrent conditions within a protected circuit is made operable over a wide operating current range by means of current transformers having multiple turn primary windings. The primary windings are selected to provide a constant ampere-turns ratio to the current transformers without changing the size of the secondary winding or the volume of the transformer core.

Abstract: A flyback transformer includes a film wound unit which is composed of a first and second film sheets on which a first and second conductors are formed. A primary coil is formed by the first conductor, and a resonance capacitor which is connected to the primary coil is formed between the first and second conductors. A plurality of secondary coils are sequentially formed, and rectifying diodes are respectively connected between the respective secondary coils. Each of the secondary coils may be a metal plating coil.

Abstract: A current carrying wire is provided with a tubular shield construction which essentially covers the wire with conductive material, and preferably emulates a classical Faraday shield. The shield is formed of a multiplicity of insulated shield wires for minimized eddy current loss. When such a shielded wire construction is formed into a primary winding of a power transformer for a switching power supply, the secondary circuit is protected from electric shock hazards while enabling use of a gap free toroidal core for close coupling between primary and secondary windings. In another embodiment, such shields are used on both the primary and secondary windings of a matching transformer and are arranged for common mode rejection of noise associated with low power data signals.

Abstract: A device for measuring electric current includes a toric core having a gap that establishes a pair of opposed end faces, and a continuous conductor having terminal ends and wound around the core in contiguous turns forming a toric solenoid interrupted by the gap. The solenoid has first and second ends adjacent the respective end faces of the core, and the conductor at each end of the solenoid passes through the core and extends along the axis thereof from the opposed end faces of the core such that the terminal ends of the conductor are located diametrically opposite the gap. A first compensation coil is serially connected to said first end of the solenoid such that the first coil overlies the first end of the solenoid to which the first compensation coil is connected.

Abstract: A line transformer suited for coupling the antenna of a nuclear magnetic resonance tomography apparatus to the RF transmission and reception circuitry is formed by a flat dielectric substrate having two congruent interconnect structures on the opposite major faces thereof. Each of the interconnect structures has two patterns of concentric conductor runs or strips, which are arranged mirror-symmetrically relative to a symmetry axis on both major faces of the substrate. The symmetry axes proceed parallel to each other, and are in registry with each other. A four port differential transformer without ferromagnetic material is obtained, which behaves symmetrically relative to the third and fourth ports, as seen from the first port as well as from the second port.

Abstract: A motion and position sensor includes a stationary member having active conductors that carry energizing power and sensing conductors that are electromagnetically coupled by a movable member to generate signals in the sensing conductors that are representative of the position of the movable member. The movable member is contactless and therefore requires no electrical connection to any other component. Thus, frictional reactance torque and electromagnetically generated torque are reduced to a minimum.

Abstract: A coil arrangement comprising two coils on a single coil former, termed a twin coil, is characterized in that the two coils (W1, W2 and, respectively, W3A), with any respective individual magnetic core (10 or, respectively, 9) required, are mounted with a substantial distance from each other on the coil former (1) and in that the respective residual coupling of the coils (W1, W2 and W3A) is eliminated by an oppositely wound or connected compensation winding (W3B). The compensating winding (8) is located in the one winding compartment (3) and has current from the coil in the other winding chamber (4) flowing through it. As a result the twin coil in accordance with the invention leads to some advantages over known twin coils in which the coupling between the two coils is nearly 100%.

Abstract: Disclosed is a planar inductor which has spiral conductor coil means sandwiched between ferromagnetic layers with insulating layers interposed therebetween. The spiral conductor coil means is formed of two spiral conductor coils of the same shape arranged flush with and close to each other. Moreover, the two spiral conductor coils are connected electrically to each other so that currents of different directions flow individually through the conductor coils. Furthermore, the spiral conductor coil means is sandwiched between the two ferromagnetic layers with the insulating layers therebetween, each of the ferromagnetic layers having an area greater than the combined area of the two conductor coils. In the planar inductor according to the present invention, inductance is prevented from lowering while its components are being bonded together, so that the inductance value per unit volume is increased.

Abstract: Here is disclosed a compact transformer comprising a plurality of core elements so combined to form a complete core defining two closed magnetic circuits, one of these magnetic circuits being provided with primary and secondary windings of a first coil and the other magnetic circuit being provided with primary and secondary windings of a second coil so that inductive portions of these first and second coils are simultaneously activated.

Abstract: An apparatus is provided for use with non-contacting torque sensors. Many non-contacting torque sensors use bulky inductive coil structures to induce magnetic flux into the shaft whose torque is to be measured, and to sense a change in magnetic permeability of the shaft in response to torque applied thereto. These large, cumbersome structures are quite expensive to fabricate, and difficult to manufacture and install. As a solution, a flexible, ribbonlike inductive coil structure is provided. The dual layer construction of this coil structure enables it to provide adequate magnetic flux distribution, similar to that of much larger coil structures. Furthermore, the unique layout of the coils results in an efficient, accurate structure for inducing and sensing magnetic flux.

Abstract: An electromagnetic device, comprising a first, ring-shaped wound unit consisting of at least first and a second sequentially wound portions of electrically insulated layers of concentrically wound windings, the first portion being made of high permeability material, the second portion being made of a relatively low resistance electrical current-carrying material, the first and second portions being electrically connected to each other and provided with terminal means for connection to a source of power, whereby in operation each of the units constitutes a current conducting as well as an electromagnetic field inducing body for the other of the interlinked units.

Abstract: Windings for magnetic core devices are preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs may be substantially less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots. A plurality of such windings are stacked, one on top of the other, or interleaved or placed on torroidal core with flexible orientation of the tabs being available to facilitate access to each of multiple terminals and to isolate or group electrical functions.

Abstract: A high frequency heating apparatus includes an inverter controlling circuit for controlling a semiconductor portion for feeding a low voltage power supply switching element, a low voltage power supply to the controlling circuit, an operation switch for activating the apparatus by a user, and a system controlling portion for controlling a load switching device. The load switching device is adapted to switch on and off at least one of the low voltage power supply leading to the inverter controlling circuit and a rectification circuit.

Abstract: Windings for magnetic core devices are preformed as a flat conducting strip disposed in a helical coil configuration of circular shape, having elongated tabs at selectible angles to the coil from substantially tangential to substantially radial orientation for cooperation with the magnetic core exit slots, thereby maximizing core window utilization and adapting to conventional cores. The cross sectional area of the tabs may be substantially less than the cross sectional area of helix turns thereby further eliminating interference with smaller core exit slots. A plurality of such windings are stacked, one on top of the other, or interleaved or placed on torroidal core with flexible orientation of the tabs being available to facilitate access to each of multiple terminals and to isolate or group electrical functions.

Abstract: A coil arrangement with three windings arranged coaxially, where the outer coils are connected in series. The inductances of the outer coils are of equal magnitude and their magnetic fields have opposing polarities.The center winding induces currents in the series circuit of the outer windings which cancel each other out. The outer windings with their stray inductances form a coil which is separated from the center one and can be applied for other purposes.

Abstract: A circuit arrangement consists of one or several high voltage transformers and rectifier systems usable advantageously for the step-up transformation of medium frequency voltages, for rectification, and smoothing. With the use of the circuit arrangement according to this invention, systems can be built up having small dimensions and low weight, and usable as high voltage supply units providing low standing wave ratio and good dynamic properties. The secondary winding of the high voltage transformer exhibits a flat arrangement. Electrically connected winding systems are designed from the secondary flat windings (flat windings of a predetermined number are connected in series). The resultant AC voltage of the individual, electrically coupled winding systems is connected to the component rectifiers. The component rectifiers are series-connected on the DC side.

Abstract: A multifilar transformer apparatus and winding method where first and second windings are bifilar wound around a core for NA turns, the first, second, third, and fourth windings are quadfilar wound around the core for NB turns, and the first and second windings are again bifilar wound around the core for NC turns. Winding symmetry is preserved and a turns ration of (NA+NB+NC):2NB is achieved.

Abstract: A transformer for current supply and/or signalling purposes, in particular for use in a connector arrangement for electrical circuits in underwater installations, includes a magnet circuit, a first winding having a plurality of turns and a second winding having one or very few turns, whereby turn portions of both windings pass essentially in parallel through one or more openings in the magnetic circuit. For obtaining advantageous electrical properties, turn portions of the first winding are so arranged that along a major part of their length which is surrounded by the magnetic circuit they are individually enclosed by that or those conductors which constitute the turn portions of the second winding that are surrounded by the magnetic circuit.

Abstract: An electromagnetic induction apparatus having an even number of coaxially disposed flat coils each having a main winding conductor and tap winding conductors wound in parallel along at least a portion of the main winding conductor to form together a flat coil. The main winding conductors are connected together by connecting the inner end of the main winding conductor of each odd-numbered one of the even number of flat coils to the inner end of the main winding conductor of the adjacent even-numbered flat coil, and connecting the outer end of the main winding conductor of the even-numbered flat coil to the outer end of the main winding conductor of the succeeding odd-numbered flat coil.

Abstract: A pulsed transformer capable of providing up to 500 kilovolt or higher, 10 nanosecond rise time, and 1000 joule or higher pulses comprising non-conducting or insulated transformer cores each separated by conductive grading rings wherein n coaxial cables in combination with the grading rings are connected in parallel at one end and in series at their other ends. The transformer may function as either an inverting or non-inverting transformer. In a transformer with n cables, if a pulse voltage of V is applied to the input, an output voltage of nV will appear at the output. The cores function to isolate the coxial cables and permit them to be connected in series at their one end. Weight may be minimized by operating the transformer in gaseous Freon rather than transformer oil.

Abstract: Inductive devices, i.e., transformers, coils, inductors, etc. are produced from a rolled flexible circuit. The flexible circuit is comprised of a dielectric substrate having a circuit pattern thereon. The circuit pattern is configured such that, upon rolling, one or more coils is formed thereby defining an inductor, transformer, etc. Additionally, these inductive devices may be easily shielded using a ground plane in the flexible circuit. The rolled flexible circuit may be secured in several ways including an adhesive or by using a thermoplastic bonding layer which acts to heat seal the circuit together. The inductive devices of the present invention may be wrapped or rolled about a permeable core which improves inductance. Inductor devices manufactured in accordance with the present invention have the advantages of being small, surface mountable, inexpensive to manufacture and being capable of insertion onto printed wiring boards using automated insertion equipment.

Abstract: An alternating power supply system is provided with a circuit which employs a transformer having three windings. The primary and secondary windings are wound in the direction upon a magnetically permeable core. A third winding is connected to a load and produces flux in the core in the opposite direction. The magnetic field produced by the third winding proportionally decreases the power input of the primary winding while maintaining the power output of the secondary winding. The circuit thereby reduces the power drain necessary to operate a given load.

Abstract: A high voltage transformer includes at least one secondary coil mounted on an insulating support assembly and having the start lead of the secondary coil disposed proximate to the transformer core with a finish lead disposed at the perimeter of the coil. The finish lead is connected to ground potential and the start lead is provided at the high voltage potential of the transformer, thereby minimizing the insulation requirements of the transformer. The insulating support assembly for the secondary coil includes flanges at the opposite ends thereof to define a winding space for the secondary coil. Each of the flanges includes a channel formed therein for providing a passageway for the high voltage start lead of the secondary coil that extends from the inside layer of the secondary coil to above the edge of the flange. The flange also has a recess that extends between the opposite edges thereof for receiving and insulating sheet member.

Abstract: A winding system for gas-cooled transformers, comprising windings disposed around a core; and at least one insulation torus, consisting of an insulating mass, said torus having embedded therein electrodes electrically connected to an adjoining winding for suppression of the electric field intensity between sinding and electrodes. The winding connected to the electrodes is divided into separate winding sections across the height of the winding, and each of these sections is connected to one electrode.

Abstract: The generator comprises a ferromagnetic core (1) having a primary winding (3) and a secondary winding which comprises a number of concentric secondary coils (7A-7F), which are wound with the same winding senses and have substantially the same number of turns and are provided with a layer of insulating material (9A-9E) between every two consecutive coils. The high-voltage portion of the generator is formed by a number of sections (19A, 19B, 19C), each of which comprises at least two series-arranged secondary coils (7A-7F), the number of secondary coils being equal for all sections and the last coil of each section being arranged in series with a rectifier (13A, 13B, 13C). All sections are arranged in series such that the rectifiers have the same forward directions.

Abstract: The present invention relates to the core of a noise filter.Conventionally, ferrite or iron powder is used as the core of a noise filter. Some patent publications disclose the core of a noise filter made of an amorphous magnetic alloy.An amorphous magnetic alloy which as a low pulse-noise resistance deterioration percentage is that on or within the curve X and Y of FIG. 3.

Abstract: An electric resonator includes first and second pluralities of conductors which are disposed in side-by-side relationship to form a first layer of alternating first and second conductors. Additional layers of alternating first and second conductors are disposed atop the first layer such that each conductor of one of the pluralities is horizontally and/or vertically adjacent to conductors of the other plurality. The resulting resonator reduces undesirable capacitance between various conductors thereby increasing the quality factor, or Q, of the resonator.

Abstract: A coil apparatus for the use of a switching power supply circuit has been found. The coil apparatus having two overlapped coil bobbins has an improved winding arrangement. This arrangement is such that one (P.sub.1) of primary windings which are provided for an inner bobbin are divided into two windings (P.sub.11, P.sub.12) which are electrically coupled with each other, and remaining primary windings (P.sub.2) are sandwiched between the two divided windings (P.sub.11, P.sub.12).

Abstract: Secondary winding configurations and methods particularly applicable for toroid transformers are described for winding secondary windings over the indexed primary winding and toroidal core. The secondary winding is formed in the configuration of a multifilar winding of a plurality of coplanar parallel filaments with a first elongate strip of electrically insulating material bonded to the filaments on one side and a second elongate strip of electrically insulating material bonded to the filaments on the other side and to the first elongate strip. The resulting electrically insulated multifilar strap winding contains the filaments in substantially parallel coplanar relationship. The multifilar strap winding is wound around the toroidal core in substantially equally spaced turns. The strap winding maintains the filaments substantially in equally spaced relationship relative to each other over irregular surfaces and compound curvature of the toroidal core without crossover.

Abstract: A planar magnetic transducer uses thin film technology to form a coil on a ceramic substrate. A relatively powerful magnet is positioned adjacent the substrate so a changing magnetic reluctance adjacent to the coil can be detected by a voltage change at the coil.

Abstract: The common winding of an autotransformer is formed in two sections connected electrically in parallel and one section overlying the other. One section is wound clockwise and the other is wound counterclockwise. This reduces the voltage difference between adjacent layers of the two sections, permits the use of a smaller wire, and results in cooler and more efficient operation.

Abstract: A wide band impedance transformer for operating at radio frequencies whose impedance transformation ratio is equal to three within ten percent, comprising coaxial cables connected together so as to determine a transformation ratio equal to (5/3).sup.2 =2.78.

Abstract: A combination transformer with common yoke core characterized by the combination of a main transformer and series transformers, which transformers have separate and complete core and coil assemblies with a common core leg or yoke to reduce the core size, weight and loss.

Abstract: The present invention discloses a modular reactor that increases the inductance per axial length by winding a conductor circumferentially about a central axis in a manner which results in radially extending columns which are sequentially wound in alternating radial order. The modules are constructed to allow them to be combined in either radial or axial juxtaposition and electrically connected either in series or in parallel.

Abstract: Conductor bundles for the concentric coils of a dry inductor having no iron core. The coils define cooling air gaps therebetween, adjacent ones of the coils being electrically connected in parallel and each coil being comprised of turns of a conductor bundle of the same rectangular cross section, the coils having different numbers of said turns. The conductor bundles form the turns of the coils and comprise a plurality of conductors electrically insulated from each other and twisted together, the conductor bundles of all coils are structurally identical with respect to the number and cross-sectional dimension of the conductors, and the rectangular cross sections of the conductor bundles forming respective coils have different cross-sectional dimensions in the axial direction of the respective coil whereby the coils have the same dimension in said axial direction while the number of the turns of the coils differs.

Abstract: Secondary winding configurations and methods particularly applicable for toroid transformers are described for winding secondary windings over the indexed primary winding and toroidal core. The secondary winding is formed in the configuration of a multifilar winding of a plurality of coplanar parallel filaments with a first elongate strip of electrically insulating material bonded to the filaments on one side and a second elongate strip of electrically insulating material bonded to the filaments on the other side and to the first elongate strip. The resulting electrically insulated multifilar strap winding contains the filaments in substantially parallel coplanar relationship. The mulfifilar strap winding is wound around the toroidal core in substantially equally spaced turns. The strap winding maintains the filaments substantially in equally spaced relationship relative to each other over irregular surfaces and compound curvature of the toroidal core without crossover.