Overlapping Laminations (e.g., & Quot;break Joint& Quot;) Patents (Class 336/217)
  • Patent number: 10910148
    Abstract: Provided is a transformer having a noise reducing means. The transformer includes: an iron core (P), which is formed by stacking a plurality of steel sheets, and has stepped parts (S) formed at a portion thereof with different widths; and the noise reducing means provided at the stepped parts (S) so as to increase coupling force among the plurality of steel sheets. The noise reducing means includes: pressing bars (30) mounted on the stepped parts (S) of the iron core (P), and having plane-shaped horizontal pressing surfaces (31) in the direction in which the steel sheets are stacked; and a binding (90) for surrounding the outer surface of the iron core (P) including the pressing bars (30), so as to press the pressing bars (30) in the stacking direction of the steel sheets.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: February 2, 2021
    Assignee: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Do Jin Kim, Chui Jun Park, Kyo Ho Lee
  • Patent number: 10869019
    Abstract: A dual depth camera module provided in a mobile robot is provided. In the dual depth camera module, a first depth camera and a second depth camera each have a turned shape at a first angle to face each other with respect to an extending line in a proceeding direction of a mobile robot, and the first depth camera and the second depth camera each have an inclined shape at a second angle to face each other in a direction opposite a surface of the ground with respect to a vertical extending line in the proceeding direction of the mobile robot.
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: December 15, 2020
    Assignee: SYSCON ENGINEERING CO., LTD.
    Inventor: Heung Soo Kim
  • Patent number: 10065266
    Abstract: The invention concerns a method for forming by welding along a flat surface an article. The method according to the invention is particularly useful to improve strength and elongation of welded joints obtained by linear friction welding. Structural articles of aircrafts obtained with the method of the invention are advantageous, in particular aircraft structural members.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: September 4, 2018
    Assignee: Constellium Issoire
    Inventors: Christopher John Glazebrook, Manuel Grenet, Julien Laye
  • Patent number: 9812252
    Abstract: A rolled iron core traction transformer, comprising an iron core (1); the iron core (1) is formed by splicing two symmetrical annealed iron-core closed single frames (1-1); each iron-core closed single frame (1-1) is formed by sequentially coiling continuous silicon steel sheets; the iron-core closed single frame (1-1) has two iron core column single bodies (1-1-1) having approximately semicircular cross sections; the iron core (1) has two iron core columns (1-2) thereon spliced by the iron core column single bodies (1-1-1) and having approximately circular cross sections; each iron core column (1-2) is sequentially provided with a low-voltage T winding (6), a low-voltage F winding (5) and a high-voltage winding (4) thereon from inside to outside; two sides of each high-voltage winding (4) are respectively provided with a first tapping area and a second tapping area; the first tapping area is provided with low-voltage side high-voltage tapping outgoing lines (16); the second lapping area is provided with high
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: November 7, 2017
    Assignees: CHANGZHOU PACIFIC ELECTRIC POWER EQUIPMENT GROUP CO., LTD., SOUTHWEST JIAOTONG UNIVERSITY, CHINA RAILWAY CORPORATION
    Inventors: Shibin Gao, Baoguo Wang, Zhiqiang Wu, Mindong Gao
  • Patent number: 9490058
    Abstract: A magnetic component for an electronic circuit includes a core having one or more core surface grooves defined on a side wall, an end wall or both, along the outer core perimeter. Each core surface groove can improve heat flux away from the magnetic component. In some embodiments, a thermally conductive gap filler material is disposed adjacent one or more of the core surface grooves. An electronic device includes a magnetic component with one or more core surface grooves positioned on a circuit board inside an enclosure. The gap filler material spans a gap between the magnetic component and an enclosure wall interior surface, thereby providing a thermal bridge between the component and the enclosure facilitating heat flux away from the core to the enclosure wall.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: November 8, 2016
    Assignee: Universal Lighting Technologies, Inc.
    Inventors: Ted Kluska, Donald Folker, Deborah Pinkerton
  • Patent number: 8686824
    Abstract: A magnetic core for an electromagnetic device is formed from alternating interleaved steel laminations. The core comprises a plurality of core elements comprising legs and yokes oriented substantially quadrature to the legs, such that abutting core elements are in substantially quadrature relation. A plurality of flux deflection zones are defined in regions where flux flows from one core element to an abutting core element. At least one of the layers has at least one core element composed of grain-oriented steel, and the remaining core elements are composed of non-grain-oriented steel, such that at least some flux deflection zones are composed of a substantial amount or substantially entirely of non-grain-oriented steel. Flux flowing in the direction of the grain orientation in the core element(s) composed of grain-oriented steel changes direction to flow through the abutting core element in the flux deflection zone composed of non-grain-oriented steel.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: April 1, 2014
    Assignee: Mirus International Inc.
    Inventors: Michael Levin, Andrii Valentyn Lavreniuk
  • Publication number: 20130147588
    Abstract: A transformer is provided having a stacked core with a pair of outer legs extending between a pair of yokes. The core is arranged in a plurality of layers. Each of the layers includes a pair of yoke plates and a pair of outer leg plates. In an inner-most layer, the width of each yoke plate is less than the width of each outer leg plate. In each of the layers, the inner points of the outer leg plates are substantially in contact with the yoke plates. The cross-section of the inner leg and the outer legs may be rectangular or cruciform.
    Type: Application
    Filed: April 14, 2011
    Publication date: June 13, 2013
    Applicant: ABB Technology AG
    Inventors: Charlie Sarver, William E. Pauley, JR.
  • Patent number: 8294544
    Abstract: An M-phase coupled inductor including a magnetic core and M windings, where M is an integer greater than one. The magnetic core is formed of a core material, and the magnetic core includes a first outer leg forming a first gap. The first gap includes a first gap material having lower magnetic permeability than the core material. Each winding is wound at least partially around at least a portion of the magnetic core, and each winding has a respective leakage inductance. The first gap causes the leakage inductances to be greater than if the first outer leg did not form the first gap. The coupled inductor may be used in a power supply, and the power supply may be used in a computing apparatus.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: October 23, 2012
    Assignee: Volterra Semiconductor Corporation
    Inventors: Alexandr Ikriannikov, Anthony Stratakos
  • Patent number: 8212645
    Abstract: A method for producing a transformer core with layers of core laminations includes forming at least one core lamination of at least two segmental laminations. An end region of a first segmental lamination has a straight crosscut edge. The straight crosscut edge of the first segmental lamination together with a corresponding straight crosscut edge of an end region of a second segmental lamination forms a form-locking straight abutting edge. The straight abutting edge is at an angle relative to the longitudinal direction of the end region of one of the segmental laminations of the first core lamination. Using core laminations having different angular orientations of the abutting edges, avoids magnetic losses such as those occurring when using conventional layering techniques. Simultaneously, an intermediate space created by conventional layering techniques between individual core lamination packs can be minimized, and thereby susceptibility to corrosion can likewise be reduced or completely avoided.
    Type: Grant
    Filed: April 10, 2008
    Date of Patent: July 3, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventors: Martin Alsina Navarro, Fritz Sorg
  • Patent number: 7978044
    Abstract: A transformer includes a frame type iron core having plate-shaped magnetic members. At least one of the plate-shaped magnetic members has a large width and forms a magnetic circuit in which a magnetic flux is concentrated. Each of the plate-shaped magnetic members includes magnetic member pieces. Each adjacent pair of end surfaces of the magnetic member pieces are joined together to form a joint portion. Three or more joint portions, each of which is formed, by joining together adjacent end surfaces of an adjacent pair of the magnetic member pieces included in the plate-shaped magnetic member having the large width, are shifted from each other in the direction of a magnetic path of the magnetic circuit to increase an effective cross sectional area of the magnetic path. The magnetic member pieces included in the plate-shaped magnetic member having the large width have a high magnetic permeability to reduce a magnetic resistance of the magnetic circuit.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: July 12, 2011
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Masaki Takeuchi, Atsushi Suzuki
  • Patent number: 7877861
    Abstract: The present invention is directed to a method of making a transformer having a stacked core, which includes top and bottom yokes and first and second outer legs. The core also includes an inner leg that is formed from a pair of stacked plates, which abut each along a seam that extends in the longitudinal direction of the inner leg. Each of the upper and lower yokes may be formed from a single stack of plates, or a plurality of stacks of plates. Each of the inner and outer legs may also be formed from a single stack of plates, or a plurality of stacks of plates. The cross-section of the core may be rectangular or cruciform.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: February 1, 2011
    Assignee: ABB Technology AG
    Inventors: William E. Pauley, Jr., Charlie H. Sarver, Rush B. Horton, Jr.
  • Patent number: 7843306
    Abstract: A transformer core includes a stack of a plurality of planar core plates of a magnetically permeable material, which plates each consist of a first and a second sub-part that together enclose at least one opening. The sub-parts can be fitted together via contact faces that are located on either side of the opening and that extend obliquely with respect to the centerline of the core plate. The invention also relates to the use of the described transformer core in a Coriolis flowmeter with the Coriolis tube extending through the opening so as to induce a current in the tube.
    Type: Grant
    Filed: May 8, 2008
    Date of Patent: November 30, 2010
    Assignee: Berkin B.V.
    Inventors: Aditya Mehendale, Wouter Hagedoorn, Joost Lotters
  • Patent number: 7679483
    Abstract: A core for a reactor includes: a plurality of core members, each of which has a convexly curved side face that serves as a bonding face; and a gap plate that is interposed between the curved side faces of the core members and that is bonded to the curved side faces. The gap plate includes a flat plate and a plurality of projections which project from each face of the plate and each of which has a tip end that contacts the curved side face. The projections are formed at positions near the outer edges of the plate, which are distant from the center of the plate at which no projection is formed, and which are at equal distances from the center of the plate.
    Type: Grant
    Filed: February 18, 2009
    Date of Patent: March 16, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroaki Yuasa, Shuichi Hirata
  • Publication number: 20090273432
    Abstract: A highly coupled inductor includes a first ferromagnetic plate, a second ferromagnetic plate, a film adhesive between the first ferromagnetic plate and the second ferromagnetic plate, a first conductor between the first plate and the second plate, and a second conductor between the first plate and the second plate. A conducting electromagnetic shield may be positioned proximate the first conductor for enhancing coupling and reducing leakage flux. A method of manufacturing a highly coupled inductor component includes providing a first ferromagnetic plate and a second ferromagnetic plate, placing conductors between the first ferromagnetic plate and the second ferromagnetic plate, and connecting the first ferromagnetic plate and the second ferromagnetic plate using a film adhesive.
    Type: Application
    Filed: May 2, 2008
    Publication date: November 5, 2009
    Applicant: VISHAY DALE ELECTRONICS, INC.
    Inventor: THOMAS T. HANSEN
  • Patent number: 7199696
    Abstract: The present invention is directed to a transformer having a stacked core, which includes top and bottom yokes and first and second outer legs. The core also includes an inner leg that is formed from a pair of stacked plates, which abut each along a seam that extends in the longitudinal direction of the inner leg. Each of the upper and lower yokes may be formed from a single stack of plates, or a plurality of stacks of plates. Each of the inner and outer legs may also be formed from a single stack of plates, or a plurality of stacks of plates. The cross-section of the core may be rectangular or cruciform.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: April 3, 2007
    Assignee: ABB Technology AG
    Inventors: William E. Pauley, Jr., Charlie H. Sarver, Rush B. Horton, Jr.
  • Patent number: 6856230
    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.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: February 15, 2005
    Inventor: Weimin Lu
  • Patent number: 6800983
    Abstract: Opposing concave structures formed in an end portion 22b of a stator yoke 22 and an end portion 23b of a magnetic core 23 are mated in a staggered manner and are joined. An upper projecting portion 22b-1 of the stator yoke 22 is fitted in a recessed portion formed on a lower projecting portion 23b-2 of the magnetic core 23, and the lower projecting portion 23b-2 of the magnetic core 23 is fitted in a recessed portion formed under the upper projecting portion 22b-1 of the stator yoke 22. In this state, the stator yoke 22 and the magnetic core 23 are fixedly fastened by a joint screw 24 and a tube 26. This structure makes it possible to reduce magnetic resistance in a magnetic circuit structure and to improve power-generating efficiency of a power-generating device using the structure.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: October 5, 2004
    Assignee: Seiko Epson Corporation
    Inventors: Yoshitaka Iijima, Kinya Matsuzawa
  • Patent number: 6646535
    Abstract: A core has a plurality of plate-shape core pieces with a magnetic pole tooth and having connecting portions formed at one end and having a first circular arc end surface and having at the other end a second end surface which can mate with the first end surface of an adjoining core piece. The core pieces are arranged in the shape of a strip through the end surfaces to form a first core member and a second core member. The core members are stacked so that the ends of adjoining core pieces in the stacking direction overlap and such that adjoining connecting portions can freely rotate through connecting means to form a ring with the magnetic pole teeth on the inside. A cutout is formed in the corner of the outer side of the core in the second end surface of each core piece.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: November 11, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Nobuaki Miyake, Yuji Nakahara, Hiroyuki Akita
  • Patent number: 6570479
    Abstract: The invention provides a transformer system and method of attaching a laminated housing on the same. The transformer system includes a laminated housing with a plurality of laminates. A coil assembly producing a magnetic field is positioned within the laminated housing. At least one low power weld is positioned on the laminated housing to bond the laminates together without substantially disrupting the magnetic field. The method of attaching the laminated housing on the transformer includes applying a low power weld to the laminated housing including a plurality of laminates. The laminates are bonded together without substantially disrupting a magnetic field produced by a coil assembly positioned within the laminated housing.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: May 27, 2003
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Gerald F. Colby
  • Patent number: 6456184
    Abstract: A reduced-cost core for an electrical-power transformer comprises at least a first magnetic loop and a second magnetic loop. The first and the second magnetic loops are positioned substantially side by side to form a winding leg for a phase winding. The first magnetic loop includes a first plurality of laminae each having a first thickness, and the second magnetic loop includes a second plurality of laminae each having a second thickness, where the second thickness is less than the first thickness.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: September 24, 2002
    Assignee: ABB Inc.
    Inventors: Tri D. Vu, Varagur R. Ramanan, Arthur L. Lanni
  • Patent number: 6218927
    Abstract: A stacked magnetic transformer core is disclosed with center leg curvilinear S-joints for reducing losses and for minimizing waste or scrap material during the manufacture of the laminations.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: April 17, 2001
    Assignee: ABB Power T&D Company Inc.
    Inventor: Vladimir Segal
  • Patent number: 6211764
    Abstract: A waterproof current transformer for supplying current to electrical cable monitoring devices includes a core assembly for attaching a remote circuit module to a monitored conductor and provides a concentrated magnetic flux indicative of the current level in the conductor. To facilitate installation and removal of the current transformer from the conductor, the core assembly is formed by a plurality of laminations served together and arranged in a generally rectangular configuration and joined with a magnetically conductive interlocking connecting means. A means for resisting moisture is disposed about the transformer to enable an indefinite submersion time span.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: April 3, 2001
    Inventor: Edmund O. Schweitzer, Jr.
  • Patent number: 6144282
    Abstract: A high voltage transformer having radiation ribs has a laminated core formed of a plurality of accumulated iron plates, first and second windings wound in the laminated core for converting an input voltage to a predetermined output voltage, and a plurality of radiation ribs formed in the accumulated direction of the plurality of iron plates on the outer periphery of the laminated core. The plurality of radiation ribs are formed as the plurality of iron plates are accumulated, by the accumulation of a plurality of protrusion portions formed along each of the plurality of iron plates. Since the radiation ribs are formed on the outer periphery and in the accumulated direction of the laminated core, all the iron plates constituting the laminated core have the same shape and are disposed in the same direction.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: November 7, 2000
    Inventor: Chea-how Lee
  • Patent number: 6131268
    Abstract: A laminated stack having a lamina layer comprised of a plurality of discrete lamina segments and which may also have laminas which define a plurality of outer perimeter configurations. The invention provides a method and apparatus for manufacturing such stacks. Lamina layers comprising a plurality of discrete lamina segments are automatically stacked by positioning the uppermost lamina in a choke barrel near the lower die bed surface and engaging the interlock tabs of the discrete lamina segments with the interlock slots of an uppermost lamina layer in the choke barrel prior to the complete separation of the discrete lamina segments from the remaining portion of the strip stock material. Each of the outer perimeter configurations has at least one common choke surface.
    Type: Grant
    Filed: November 4, 1997
    Date of Patent: October 17, 2000
    Assignee: L. H. Carbide Corporation
    Inventor: Thomas R. Neuenschwander
  • Patent number: 6094125
    Abstract: A thin plate stack assembly formed by stacking a plurality of metallic thin plates and connecting the thin plates to one another, wherein each thin plate comprises a slit and formed leaf which is formed by press working to downwardly slit and form a partial area which is surrounded by an outer edge which is a part of the outer periphery of a thin plate, side edges extending by a certain length toward the inside from both ends of the outer edge, and an inner edge connecting the inside ends of the side edges to each other, and which is bent obliquely downward from said thin plate at the location of said inner edge. The side edges are cut from the thin plate, and a slit and formed hole formed behind the slit and formed leaf, and the slit and formed leaf of each thin plate is inserted into the slit and formed hole in a thin plate disposed just under the thin plate in force fitting for connecting the upper and lower thin plates to each other.
    Type: Grant
    Filed: July 14, 1999
    Date of Patent: July 25, 2000
    Assignee: Wako Seiki Co., Ltd.
    Inventor: Kunio Ito
  • Patent number: 6070317
    Abstract: A quiet transformer includes a laminated core having each laminate formed as a flat layer from highly grain oriented silicon steel which is fabricated by laser cutting techniques with each layer including five segments in intimate contact with each other via mitered butt lap joints having increased length and asymmetrical angles at opposite ends for reducing the reluctance of the gaps between adjacent lamination segments. The center segment has V joints of different angles on opposite ends. Clamping holes formed in the element of said lamination having the largest cross section at the location in the segment away from said gaps to prevent magnetic flux crowding and increased local flux density. Indexing pins on opposite faces of the segments close and lock in the gaps of the core with each layer being 100% interleaved for producing low joint reluctance and to minimize magnetostrictive forces. The core is pressurized by clamping brackets and bolts connected to opposite ends of the core.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: June 6, 2000
    Assignee: Espey Mfg. & Electronics Corp.
    Inventors: George M. Allen, Harold R. O'Connor, Seymour Saslow
  • Patent number: 6002321
    Abstract: A demining coil to be fastened to a demining vehicle, which coil comprises a magnetic core and wherein the ratio of length to the largest transversal dimension of the core of the coil is greater than or equal to 4. The core of the coil may be fluted in shape and/or magnetically laminated. A demining device utilizes a plurality of demining coils spaced in different directions to maximize the area of detection.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: December 14, 1999
    Assignee: Giat Industries
    Inventor: Loic Laine
  • Patent number: 5959523
    Abstract: Magnetic core structure of the stacked type having outer legs, at least one inner leg, and top and bottom yokes formed of a plurality of stacked groups of layers of metallic laminations. The yoke and leg laminations have their ends cut diagonally to provide a closed magnetic circuit having diagonal joints between adjoining ends of the yoke and leg laminations. The length dimensions of the inner leg laminations are uniform from layer to layer within each group, while the junction of the diagonally cut ends of the inner leg laminations are offset from the centerline thereof from layer to layer in a step pattern that progresses an equal number of steps on each side of the centerline of each group of layers of inner leg laminations to be step dependent. The configuration of the outer leg laminations and the top and bottom yoke laminations are uniform from layer to layer within each group to be step independent.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: September 28, 1999
    Assignee: ABB Power T&D Company Inc.
    Inventor: Johan Westberg
  • Patent number: 5861792
    Abstract: A miniaturized, thin coil component with enhanced heat radiation and decreased flux leakage includes an I-shaped laminate iron core having at opposite ends tapered surfaces, and a pair of C-shaped laminate iron cores having tapered surfaces adapted to be mated with the tapered surfaces of the I-shaped laminate iron core. The I-shaped laminate iron core and the C-shaped laminate iron cores are combined so that the I-shaped laminate iron core is pressed by the inner surfaces of the tapered surfaces of the pair of C-shaped iron cores. The iron cores used for the coil component are stamped by a process of positioning the C-shaped cores in opposition to each other perpendicular to the hoop width, shifting one of the C-shaped cores perpendicular to the hoop width, obliquely positioning the I-shaped core between the C-shaped cores and then successively stamping the iron core hoop.
    Type: Grant
    Filed: November 28, 1997
    Date of Patent: January 19, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Satoshi Ueda, Kazusa Mori, Satoshi Umehara, deceased, Masami Tsuji, Yoshiyuki Nishimura
  • Patent number: 5777537
    Abstract: A quiet transformer includes a laminated core having each laminate formed as a flat layer from highly grain oriented silicon steel which is fabricated by laser cutting techniques with each layer including five segments in intimate contact with each other via mitered butt lap joints having increased length and asymmetrical angles at opposite ends for reducing the reluctance of the gaps between adjacent lamination segments. The center segment has V joints of different angles on opposite ends. Clamping holes formed in the element of said lamination having the largest cross section at the location in the segment away from said gaps to prevent magnetic flux crowding and increased local flux density. Indexing pins on opposite faces of the segments close and lock in the gaps of the core with each layer being 100% interleaved for producing low joint reluctance and to minimize magnetostrictive forces. The core is pressurized by clamping brackets and bolts connected to opposite ends of the core.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: July 7, 1998
    Assignee: Espey Mfg. & Electronics Corp.
    Inventors: George M. Allen, Harold F. O'Connor, Seymour Saslow
  • Patent number: 5755023
    Abstract: A laminated stack having a lamina layer comprised of a plurality of discrete lamina segments and which may also have laminas which define a plurality of outer perimeter configurations. The invention provides a method and apparatus for manufacturing such stacks. Lamina layers comprising a plurality of discrete lamina segments are automatically stacked by positioning the uppermost lamina in a choke barrel near the lower die bed surface and engaging the interlock tabs of the discrete lamina segments with the interlock slots of an uppermost lamina layer in the choke barrel prior to the complete separation of the discrete lamina segments from the remaining portion of the strip stock material. Each of the outer perimeter configurations has at least one common choke surface. The common choke surfaces form, when the laminas are stacked, a choke contacting surface on the outer perimeter surface of the lamina stack which extends continuously in the axial direction from the top lamina to the bottom lamina.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: May 26, 1998
    Assignee: L.H. Carbide Corporation
    Inventor: Thomas R. Neuenschwander
  • Patent number: 5608371
    Abstract: A method of making a repairable transformer having an amorphous metal core. The three uncut legs of an annealed wound amorphous metal core are covered with an adhesive material while leaving the cut leg and both adjoining radii covered, but not bonded. The core joint is opened and coils are placed over the legs that adjoin the cut leg. The core joint is closed and the edges of the joint and both adjoining radii are covered with an inner layer of porous material which is secured by an outer wrap of electrical grade steel. The resulting transformer can be easily repaired by unwrapping away the porous material that covers the cut leg and the adjoining radii, opening the core joint, replacing a defective coil or core, reclosing the core joint, and rewrapping the porous material and reclosing the outer layer of electrical grade steel.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: March 4, 1997
    Assignee: ABB Power T&D Company, Inc.
    Inventors: Milan D. Valencic, Ram R. P. Sinha
  • 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: 5406243
    Abstract: Complementary packs of laminations (41, 43) are provided for use in an electromagnetic device, the laminations in different layers having legs of length that alternates according to a predetermined pattern. The lamination of one pack (41) can fit into the laminations of another pack (43) which has legs alternating according to a complementary pattern. The packs (41, 43) can be push-fitted together about a bobbin (45) to form an interleaved stack of laminations for a transformer or other electromagnetic device. A method and apparatus for forming the stacks are also described.
    Type: Grant
    Filed: August 26, 1991
    Date of Patent: April 11, 1995
    Assignee: Linton & Hirst Limited
    Inventors: Peter R. Jenkins, Trevor Hirst
  • Patent number: 5371486
    Abstract: A transformer core includes a first core member formed by laminating grain oriented 3% silicon steel sheets and second core members disposed at respective sides of the first core member in the direction of lamination so that the first core member is sandwiched by the second core members. Each second core member is formed by laminating non-oriented 6.5% silicon steel sheets. A commercial frequency component of magnetic fluxes mainly passes through the second core members such that an amount of noise caused by a higher harmonic component is reduced.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: December 6, 1994
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuo Yamada, Eiji Shimomura, Kenshi Ishihara, Miyoshi Horiuchi
  • Patent number: 5329270
    Abstract: This transformer core comprises superposed groups of amorphous steel strip wrapped about the core window, each group comprising an inner section and an outer section disposed in superposed relationship, and each section comprising many thin layers of amorphous steel strip. Each of the layers in a section has a length dimension measured between the transversely-extending edges of the layer located at opposite ends of the section. The layers in the inner section of a group have substantially equal lengths, and the layers in the outer section of said group have substantially equal lengths of a greater value than the lengths of the layers in the inner section. At one end of each group the transversely-extending edges of all the layers in said group are substantially aligned to form a smooth edge.
    Type: Grant
    Filed: June 26, 1992
    Date of Patent: July 12, 1994
    Assignee: General Electric Company
    Inventor: David R. Freeman
  • Patent number: 5285565
    Abstract: This method is practiced by first providing a plurality of spools of amorphous steel strip in each of which the strip is wound in single-layer thickness. Then, in a pre-spooling machine, the single-layer thickness strips are unwound from said plurality of spools and combined to form strip of multiple-layer thickness which is wound onto a plurality of master reels, on each of which the strip is wound in multiple-layer thickness. These master reels are then placed on a plurality of payoffs, and the multiple-layer thickness strip is unwound from these payoffs and combined into a composite strip that has a thickness in strip layers equal to the sum of the strip layers in the combined multiple-layer thickness strips. Then the composite strip is cut into a plurality of sections, or lengths, of composite strip, and with these sections a hollow core form is constructed, which form has a window about which the sections are wrapped.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: February 15, 1994
    Assignee: General Electric Company
    Inventors: Donald E. Ballard, Willi Klappert
  • Patent number: 5185196
    Abstract: An activated oil formulation provides a surface layer upon the faces of a transformer coil stack, to which is subsequently applied a layer of a polymerizable liquid adhesive composition. The adhesive composition is curable by both chemically induced and photo-induced reactions, and the oil formulation includes a chemical cure initiator for the adhesive composition. A coated laminate stack is produced in which fully cured fillets of the solid coating extend between the plates and bond together their confronting marginal portions.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: February 9, 1993
    Assignee: Dymax Corporation
    Inventor: Gary V. Grosclaude
  • Patent number: 5185688
    Abstract: A split core degaussing coil loop having a segmented and disassembled loop portion that is joined together to include an object to be demagnetized, in situ, as part of the assembled core loop and further having an inductor coil assembled with the loop that is selectively energized in one or more steps from a source of electrical power which generates a demagnetizing force directed to the object.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: February 9, 1993
    Assignee: Ingalls Shipbuilding, Inc.
    Inventor: Joseph V. Krebs, Jr.
  • Patent number: 5134771
    Abstract: In this method of manufacturing an amorphous metal transformer core, there is provided a core form that comprises sections of amorphous metal strip wrapped about the core window, the strip sections having edges at laterally opposite sides thereof and the core form having at its laterally opposed sides a pair of faces where the edges of the strip sections are located. This core form is subjected to an annealing operation to relieve stresses therein. Then, the strip sections are displaced with respect to each other in a first lateral direction to develop a telescoping relationship between juxtaposed strip sections that disrupts short circuiting adhesions between juxtaposed strip sections that had developed during the annealing step. Thereafter, the strip sections are returned in a lateral direction opposite to the first lateral direction to restore their edges to substantially their normal, or original, positions.Disrupting the short circuiting adhesions results in reduced core loss in the final product, i.e.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: August 4, 1992
    Assignee: General Electric Company
    Inventors: Albert C. Lee, W. C. Harris
  • Patent number: 5083360
    Abstract: Disclosed is a method of making a repairable transformer having an amorphous metal core. The three uncut legs of an annealed wound amorphous metal core are covered with an adhesive material while leaving the cut leg and both adjoining radii covered, but not bonded. The core joint is opened and coils are placed over the legs that adjoin the cut leg. The core joint is closed and the edges of the joint and both adjoining radii are covered with an inner layer of porous material which is secured by an outer wrap of electrical grade steel. The resulting transformer can be easily repaired by unwrapping away the porous material that covers the cut leg and the adjoining radii, opening the core joint, replacing a defective coil or core, reclosing the core joint, and rewrapping the porous material and reclosing the outer layer of electrical grade steel.
    Type: Grant
    Filed: September 28, 1988
    Date of Patent: January 28, 1992
    Assignee: ABB Power T&D Company, Inc.
    Inventors: Milan D. Valencic, Ram R. P. Sinha
  • Patent number: 5073766
    Abstract: A transformer core and method of assembling the core which utilizes a plurality of two types of generally E-shaped laminations, type A and type B, each having two legs extending approximately the same distance and an outer third leg extending a distance substantially greater than the distance extended by the other two legs, thereby providing an extending outer leg portion on both laminations. The laminations are formed by stacking a number of core members, two of which are cut from a rectangular section of electrical steel. The type A core members and laminations are provided with a notch and an indentation extending from the bottom perimeter of the base. The type A and type B laminations are alternately positioned on stacking shims with the extending leg portion of all type A laminations at one side and the extending leg portion of all type B laminations on the opposite side.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: December 17, 1991
    Assignee: Square D Company
    Inventor: Eric L. Hays
  • Patent number: 5063654
    Abstract: This method of making packets for transformer-core manufacture comprises: (i) providing a composite strip comprising many thin layers of amorphous steel strip, (ii) advancing the leading end of the composite strip forward, (iii) cutting the composite strip at a location spaced rearwardly of the leading edge of the strip, thereby detaching a first section of multi-layer strip and creating a new leading end just behind the cutting location, and (iv) then clamping the detached section to a supporting surface. Then the following steps (a) and (b) are carried out. (a) The new leading end of the composite strip is advanced forward, and the strip is cut at a location spaced rearwardly of the new leading edge, thus detaching an additional section of multi-layer strip and creating another new leading end just behind the latter cutting location.
    Type: Grant
    Filed: December 12, 1990
    Date of Patent: November 12, 1991
    Assignee: General Electric Company
    Inventors: Willi Klappert, David R. Freeman
  • Patent number: 5055815
    Abstract: A stationary induction electric apparatus and a method for manufacturing the apparatus is disclosed. The apparatus comprises a reinforcement frame to be mounted on an inner peripheral surface of a rectangular core, a protective cover for covering both of the rectangular core and the reinforcement frame, a reinforcement band to be wound on an outer peripheral surface of the rectangular core on which the protective cover is mounted, and windings to be fitted on the leg portion of the rectangular core on which the reinforcement frame, the protective cover, and the reinforcement band are mounted.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: October 8, 1991
    Assignee: Daihen Corporation
    Inventors: Yasuo Yamamoto, Katsumi Hanaoka, Masatake Hirai, Toshiko Yamada
  • Patent number: 4993140
    Abstract: A method of making a transformer having a core composed of a web of magnetic amorphous metal of small thickness.The laminations of the core of the transformer are the stacked turns formed by winding the web into a spiral having a window in the center. The coils are wound as integral structures having openings for telescoping the coils onto the core. For the telescoping, the core is cut and converted into a U-shaped structure on whose arms the coils are telescoped. The cut joint is a butt-lap-step joint. To produce such a joint, the laminations are divided into groups and each group is divided into steps which are spaced longitudinally of the web. After the coils are telescoped onto the core, the cut ends of the arms of the U are abutted to form a closed core. The cuts in the laminations that make up alternate groups in the stack are inclined to the longitudinal center line of the web at a first angle different from 90.degree..
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: February 19, 1991
    Assignee: ABB Power T & D Co., Inc.
    Inventors: Frank H. Grimes, Eugenius S. Hammack
  • Patent number: 4993141
    Abstract: A method of making a product for use in fabricating a low-loss core of a transformer. The core is composed of a web of amorphous metal of small thickness. In forming the product, the web is wound into an annular spiral structure on a circularly cylindrical mandrel. The structure is removed from the mandrel and collapsed into an approximate figure "8" shape and groups of cuts are produced in the upper collapsed surface of the figure "8". Each cut defines a step of a group. Each step has a number of turns of the web and each group has a number of steps. The steps of each group are offset in a succession along the structure and penetrates progressively into the structure. Successive groups extend progressively inwardly throughout the structure. The cuts subdivide the structure into separate strips. The strips are wrapped in a spiral to form a lapped spiral structure onto a second circularly cylindrical mandrel of smaller diameter than the first mandrel.
    Type: Grant
    Filed: July 19, 1989
    Date of Patent: February 19, 1991
    Assignee: ABB Power T&D Co., Inc.
    Inventors: Frank H. Grimes, Eugenius S. Hammack
  • Patent number: 4972573
    Abstract: A method for manufacturing rectangular wound cores including a step of forming at least one developed lamination body by cutting off at least one ring-like lamination body, a step for applying adhesive agent to one of cut ends of each developed lamination body, a step forming lamination blocks each of which is comprised of plural lamination units shifted in the length-wise direction by a predetermined distance and a step for jointing both ends of each of lamination unit in an overlapping state by winding each lamination block around a shaping bobbin.
    Type: Grant
    Filed: July 26, 1989
    Date of Patent: November 27, 1990
    Assignee: Daihen Corporation
    Inventors: Yasuo Yamamoto, Katsumi Hanaoka, Masatake Hirai, Nobuyuki Sumida, Masatake Kokado
  • Patent number: 4972168
    Abstract: A transformer having a core having a butt-lap-step joint. The laminations of the core are the turns of a spiral into which a web of very thin amorphous magnetic material is wound. At the joint, the core is cut producing opposite folds whose ends are aligned. The purpose of the joint is to enable the core to be opened by pealing off the folds defining the cuts and converted into a U-shaped structure; coils are telescoped on the arms. The core is closed by refolding the folds and aligning the ends of the opposite folds. At the joint the laminations, subdivided into successive groups, are cut at an angle of the order of 87.degree. to the center line of the laminations; alternate groups being cut inclined in one direction and the intervening groups being cut inclined oppositely. The oppositely inclined cuts preclude mismatching and mislocating the groups when the core structure is closed after the coils are telescoped on the arms.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: November 20, 1990
    Assignee: ABB Power T & D Company, Inc.
    Inventors: Frank H. Grimes, Eugenius S. Hammack
  • Patent number: 4970776
    Abstract: A stationary induction electric apparatus and a method for manufacturing the apparatus. The apparatus comprises a reinforcement frame to be mounted on an inner peripheral surface of a rectangular core, a protective cover for covering both of the rectangular core and the reinforcement frame, a reinforcement band to be wound on an outer peripheral surface of the rectangular core on which the protective cover is mounted, and windings to be fitted on the leg portion of the rectangular core on which the reinforcement frame, the protective cover, and the reinforcement band are mounted.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: November 20, 1990
    Assignee: Daihen Corporation
    Inventors: Yasuo Yamamoto, Katsumi Hanaoka, Masatake Hirai
  • Patent number: 4918832
    Abstract: A process is provided for assembling a laminated iron core on a support structure about an electric coil from a plurality of laminations to form a shell-type transformer core. According to the process, the plurality of lamination sections are stacked in a staggered relationship to form a first core section which has joint ends to form overlapping joints between an adjacent core section. The first core section is stacked by placing a slider sheet of a low coefficient of friction on a first support member and stacking the lamination sections on the slider sheet. The first core section is then conveyed onto the support structure at which the iron core is to be assembled, and the slider sheet is pulled out to cause the first core section to directly sit on the support structure. The plurality of lamination sections are inserted between the joints on site to form a second core section which connects the joint ends of the first core section to define a magnetic circuit around the coil.
    Type: Grant
    Filed: February 24, 1989
    Date of Patent: April 24, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Osamu Tokumasu, Yoshihiro Kuzuha, Hirosi Suzuki, Bunichiro Awata