Patents Examined by G. R. Lord
  • Patent number: 5719545
    Abstract: A superconducting transformer comprises a superconducting primary layer arranged to conduct an externally supplied primary electric current around a primary core to establish a magnetic flux through the primary core. The superconducting primary layer is formed on a primary substrate of electrically insulating, non-magnetic material. A superconducting secondary layer is arranged to conduct a secondary electric current around a secondary core. The superconducting secondary layer is formed on a secondary substrate of electrically insulating, non-magnetic material. The primary and secondary cores are made of a non-saturating material. The secondary electric current is generated by stacking the layers to couple the magnetic flux from the primary core to the secondary core. Superconducting vias are formed through the primary, isolation, and secondary layers for making external connections to the transformer.
    Type: Grant
    Filed: October 12, 1994
    Date of Patent: February 17, 1998
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Leopold J. Johnson
  • Patent number: 5652561
    Abstract: A laminating type molded coil and a method of fabricating the same comprising at least one coil substrate structure in which coils are formed on both sides of an insulating substrate by use of a printed wire technique, resin sheets disposed on both side of the coil substrate structure, and insulating covering sheets disposed on the outermost surfaces of the resin sheets, wherein when heated and subjected to pressure the spaces between the layers and between the coils are filled with resin from the resin sheets, and then hardened to produce an integral structure. Advantageously, because the coil pattern has a predetermined shape and is formed by printed wire techniques, the thickness of the coils may be thin and the gaps between the coils may be narrow. By using the invention method, the fabrication does not require use of a molding box as does the conventional method and the fabrication is done with simple steps.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: July 29, 1997
    Assignees: Yokogawa Electric Corporation, Ibiden Company, Limited
    Inventors: Kiyoharu Inoh, Hisanaga Takano, Eiji Sumiya, Akihiro Demura
  • Patent number: 5635892
    Abstract: An inductive structure is provided which displays an increased self-inductance and improved Q at high frequencies. The improvement resides in the disposition proximate the inductive structure an amount of magnetic material to increase mutual inductance between adjacent portions of the inductor's conductive path with current flow.
    Type: Grant
    Filed: December 6, 1994
    Date of Patent: June 3, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Kirk B. Ashby, Iconomos A. Koullias
  • Patent number: 5608370
    Abstract: A rotary transformer includes a rotor core formed by stacking channel parts to form a required number of channels. Each channel part is formed by stacking two kinds of annular magnetic rings so that two rings having the same outside and inside diameters are placed at both sides of a ring having the same inside diameter as the two rings but a greater outside diameter than the two rings. A stator core is also formed by stacking channel parts to form the required number of channels. The channel part is formed by stacking two kinds of annular magnetic rings so that two rings having the same outside and inside diameters are placed on both sides of a ring having the same inside diameter with the two rings but smaller outside diameter than the two rings. A thin layer of glass can be used to bond the rings of the stator or rotor together.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: March 4, 1997
    Assignee: LG Electronics Inc.
    Inventor: Woo S. Jang
  • Patent number: 5600293
    Abstract: An integrated magnetic exploding foil initiator fire set includes a DC-DC converter with a first transformer, a triggering mechanism with a second transformer, and an integrated magnetic structure for the respective transformers. Inductive interference is minimized in the respective transformers by the construction and placement of the transformer windings. The use of planar magnetic core material and flexprint or printed circuit technologies for the windings reduces the cost and weight of the structure and provides a compact construction. Thus, the triggering mechanism provides higher energy and voltage output and eliminate the need for expensive spark-gap switches.
    Type: Grant
    Filed: June 14, 1994
    Date of Patent: February 4, 1997
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Donald Hunter
  • Patent number: 5598137
    Abstract: In order to achieve improved mechanical properties for a coil (1), it is proposed to structure a first electroconductive winding (3) of the coil (1) as a coil former. This coil has a first connecting element (15), to which a second connecting element (17) is attached via an insulating part (25). The two connecting elements (15, 17) form the connections for the coil (1). In this way, a self-supporting coil structure is achieved. The coil (1) is particularly intended as an undervoltage winding with a low number of windings for cast resin transformers.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: January 28, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventors: Friedrich Alber, Rudolf Dedelmahr, Siegfried Kromer, Hans Schott, Siegfried Weiss
  • Patent number: 5596305
    Abstract: A dry type transformer has an iron core, high voltage windings embedded in cast resin, and low voltage windings resin encapsulated. The low voltage winding is constructed with flexible sheet conductors coincident with layer insulation sheets that extend beyond the edge of the sheet conductor. Cooling air ducts are fabricated in the low voltage windings as it is wound. To prevent the extension of the layer insulation sheets from collapsing over the formed air ducts during a vacuum and pressure resin impregnation process, reinforcing means are added to the extensions to prevent them from collapsing.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: January 21, 1997
    Inventor: Jeewan Puri
  • Patent number: 5583475
    Abstract: The method comprises producting a linear coil (4) by winding around a cylindrical mandrel (5) a conductor wire coated with a thermo-adhesive varnish, opening the toroidal magnetic circuit (1), withdrawing the linear coil (4) from the cylindrical mandrel (5), heating the linear coil (4) so as to render it flexible, slapping the linear coil over the open toroidal magnetic circuit (1), reclosing the toroidal magnetic circuit, and allowing the assembly to cool.
    Type: Grant
    Filed: February 2, 1995
    Date of Patent: December 10, 1996
    Assignee: Mecagis
    Inventors: Rouelle Raholijaona, Luc Colombel, Roger Deon
  • Patent number: 5574418
    Abstract: A three-phase autotransformer improving balance of three-phase voltages and currents. An iron core has three legs corresponding to the three phase. A common winding and/or a serial winding of each phase includes three coils. Two of the three coils are wound on the same leg associated with the phase of the coils, and the other one coil is wound on another leg. The two coils and the other one coil are connected in series to generate magnetic flux in the opposite directions. Since the common winding and/or the series winding includes coils which are wound on different legs associated with different phases, and which generate flux in opposite directions, the balance of three-phase input voltages and currents, and output voltages and currents is automatically maintained.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: November 12, 1996
    Inventor: Mitsuya Matsumura
  • Patent number: 5572180
    Abstract: A multi-tapped surface mount inductor (300) providing high quality factor (Q) and high inductance is capable of being surface mounted on any of its four sides. An inner substrate layer(s) (322) is provided with metallized patterns (328, 332) and vias (336) to form a multi-turn coil. The inner substrate layer (322) is then sandwiched between first and second outer substrate layers (324, 326) to form a six sided structure. Tapped element(s) (304) can be tapped off the multi-turn coil in increments of a quarter turn or less to provide a multi-tapped surface mount inductor capable of being mounted an any of its' four side surfaces (310, 312, 314, 316). When tapped element(s) (204) are tapped symmetrically between the input/output ends (214, 216), the surface mount inductor (200) may interchange its' input/output ends (214, 216) making the component surface mountable in eight different positions.
    Type: Grant
    Filed: November 16, 1995
    Date of Patent: November 5, 1996
    Assignee: Motorola, Inc.
    Inventors: Philip M. Huang, John J. Neumann, John L. Holley, Jr.
  • Patent number: 5568114
    Abstract: A winding support body (6, 10) for transformers/reactors with a winding of a tape-formed superconductor (8), wherein the support body consists of a substantially straight, circular-cylindrical tubular body which, on the side where the winding is to be placed and out towards the two ends, is provided with a helical slot with a plane surface with a width equal to the width of the tape. In this way, each turn of the slot around the support body forms a surface which practically constitutes the envelope surface of a straight frustum of a cone. The angle (v) between a generatrix (9) of the envelope surface and the axial center line of the support body increases for each turn out towards the ends of the support body in such a way that the envelope surface at all points coincides with the direction of the magnetic field (FIG. 4 ).
    Type: Grant
    Filed: January 19, 1995
    Date of Patent: October 22, 1996
    Assignee: ASEA Brown Boveri AB
    Inventors: Thomas Fogelberg, Uno Gafvert, Sven Hornfeldt
  • Patent number: 5565836
    Abstract: The internal and/or external magnetic fields of a coil are nullified to ad structurally detrimental Lorentz Forces and/or environmentally hazardous magnetic fields, in accordance with preestablished design objectives.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: October 15, 1996
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Lawrence R. Groehl, John M. O'Meara
  • Patent number: 5565835
    Abstract: Main and supplemental windings are combined in a toroidal inductor to subntially nullify Lorentz Forces on the main winding and the magnetic field thereof which passes externally from the inductor.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: October 15, 1996
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Lawrence R. Groehl
  • Patent number: 5559487
    Abstract: A conductive winding electrically isolated by reflowable material which is incorporated into a transformer further including individual layers of electrical insulation material. The transformer is formed in a layered configuration wherein isolation requirements set forth by safety certification agencies are met through the use of the reflowable material and insulation layers.
    Type: Grant
    Filed: May 10, 1994
    Date of Patent: September 24, 1996
    Assignee: Reltec Corporation
    Inventors: Jerry L. Butcher, Harold E. Lee
  • Patent number: 5557249
    Abstract: A three phase transformer having a pair of additional coupled windings on the secondary side of each phase, with these coupled windings properly connected in series to develop a voltage in phase with a particular secondary voltage but driven from alternate phase primaries. The primary and secondary windings are connected in a Y or .DELTA. configuration. One coupled winding from each of the two phases, other than the desired secondary phase which is to be balanced, are joined in negative series so that when summed, they are aligned with the secondary phase being corrected. The series coupled windings are connected in parallel with the third secondary. The unbalanced current is split between the secondary winding and between the two coupled windings, each of which is coupled to the primary of another phase. The coupled winding combined voltages and resistances are approximately equal to the voltage and resistance of the secondary.
    Type: Grant
    Filed: August 16, 1994
    Date of Patent: September 17, 1996
    Inventor: Thomas J. Reynal
  • Patent number: 5550523
    Abstract: The inductor has a winding arranged on a straight magnetic core formed by, for example, a ferrite cylinder (4) accommodated in a cylinder (1) made of a moulded plastics material and having a longitudinal groove in its outer cylindrical surface, in which groove a bar (2) of an electrically resistive material is mounted, the bar being fixed underneath the winding wire (3). The inductor is used for the injection of low-frequency current into a cable of a CATV system.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: August 27, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Pascal Rouet, Bernard Delvart
  • Patent number: 5543771
    Abstract: A phase shifting polygonal transformer or autotransformer for a three phase electrical distribution system is provided, in which the transformer output winding or autotransformer winding is composed solely of three main coils and three auxiliary coils, alternately interconnected in series. The outputs for the transformer/autotransformer are connected to taps in the coils offset from the connections between coils, which eliminates the need for multiple auxiliary coils in each phase. The transformer/autotransformer of the invention is thus much simpler and less expensive to manufacture than a conventional phase shifting transformer or autotransformer, but reduces harmonics just as effectively.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: August 6, 1996
    Inventor: Michael I. Levin
  • Patent number: 5537088
    Abstract: In an induction sensor, a plurality of positioning holes are formed through each of a scaler and a slider. The positioning holes of the scaler and slider are spaced the same distance from respective coils and are of the same size and arranged at the same interval. The gap length and azimuth angle between the scaler and the slider are maintained with accuracy.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: July 16, 1996
    Assignee: NEC Corporation
    Inventor: Takeshi Ikemoto
  • Patent number: 5534837
    Abstract: An electro-magnetic device for use in applications requiring low-profile components. The device includes a magnetic substrate with a scheme of through-holes in association with a first and second winding, plated or wired, integral to the substrate and wound orthogonal to each other. The first winding comprises the AC inductor/transformer permeability. The second winding in association with an applied DC bias current causes the permeability to vary over a wide controlled operating range.
    Type: Grant
    Filed: July 28, 1994
    Date of Patent: July 9, 1996
    Assignee: Rockwell International
    Inventor: Randy L. Brandt
  • Patent number: 5530416
    Abstract: An inductor which has a ferrite core and a coil wound around the ferrite core. The ferrite core is coated with borosilicate zinc glass. The ferrite core is produced by: adding a low-temperature-sintered oxidized metal, such as BiO.sub.2 and PbO, and a resin binder to ferrite powder of Mn, Fe, Co, Ni or the like; mixing the materials together; compression molding the mixture; and sintering the molded article in a low temperature.
    Type: Grant
    Filed: December 6, 1994
    Date of Patent: June 25, 1996
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Shinji Wakamatsu, Tetsuya Morinaga