Hollow Conductor Coil Patents (Class 336/62)
  • Patent number: 9505079
    Abstract: A high capacity aluminum spot welding trans-gun includes a pair of opposed electrodes, a weld control that controls the operation of the trans-gun, and a transformer that regulates the voltage to the trans-gun having a primary input voltage and secondary output voltage. A liquid-cooled high voltage primary conductor electrically connects the weld control to the transformer primary input and a low voltage secondary conductor electrically connects the transformer secondary output to the welding gun to energize the opposed electrodes.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: November 29, 2016
    Assignee: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: William C. Moision, Elizabeth Therese Hetrick
  • Patent number: 9142345
    Abstract: A conductive winding assembly combining a bent conduction sheet member and a covering member is provided. The bent conduction sheet member has a channel. The covering member includes a connection part, a first lateral plate, a second lateral plate, and a hollow part. A first groove is arranged between the first lateral plate and the connection part. A second groove is arranged between the second lateral plate and the connection part. The bent conduction sheet member is inserted into the covering member through the first groove and the second groove, and the connection part is inserted into the channel. The bent conduction sheet member is partially accommodated within the hollow part, and the bent conduction sheet member is partially exposed outside the covering member through the hollow part.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: September 22, 2015
    Assignee: DELTA ELECTRONICS, INC.
    Inventors: Chia-Hung Chen, Kun-Te Chen
  • Patent number: 9041501
    Abstract: The disclosure relates to an amorphous transformer core including at least one transformer core disc with a plurality of layers of strip-like amorphous core material arranged concentrically around at least one winding window. At least one heat dissipating plate extends into an interior of the amorphous transformer core and is fed from there into at least one heat exchange region outside the amorphous transformer core. This can enhance dissipation of heat energy which is produced inside the amorphous transformer core.
    Type: Grant
    Filed: December 5, 2011
    Date of Patent: May 26, 2015
    Assignee: ABB TECHNOLOGY AG
    Inventors: Martin Carlen, Marcos Bockholt, Benjamin Weber
  • Patent number: 8928441
    Abstract: A magnetic component such as a transformer or inductor comprises one or more litz-wire windings and one or more metallic cooling tube windings. Each litz-wire winding is wound together with a corresponding single metallic cooling tube winding on a common bobbin to provide an indirectly-cooled magnetic component.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: January 6, 2015
    Assignee: General Electric Company
    Inventors: Satish Prabhakaran, Konrad Roman Weeber, Richard S. Zhang, Charles Michael Stephens, Mark Edward Dame, Yang Cao
  • Patent number: 8680959
    Abstract: An immersion cooled inductor includes an inductor at least partially submerged in cooling liquid and a localized boiling feature operable to instigate boiling of the cooling liquid prior to oversaturation.
    Type: Grant
    Filed: May 9, 2012
    Date of Patent: March 25, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Robert Scott Downing
  • Patent number: 8461953
    Abstract: An air cooling system, method, apparatus and kit applied to lower transformer operating temperatures, such as governed by a tank or container of oil, allowing transformer components to run more efficiently at a lower temperature level, e.g., down from the hot level operating temperatures typical in stressed conventional devices. By lowering the operational levels to within or below the nominal operational temperature ranges for the equipment, and recovering heat generated during operation, several advantages are obtained.
    Type: Grant
    Filed: August 18, 2010
    Date of Patent: June 11, 2013
    Inventor: Marvin W. Ward
  • Patent number: 8436706
    Abstract: A pumped loop cooling system is provided to cool a hollow winding of a transformer utilizing a two phase vaporizable dielectric refrigerant. A liquid refrigerant pump circulates the refrigerant into a transformer and through a copper tube winding of the transformer where the refrigerant at least partially vaporizes in removing heat from the transformer. The refrigerant is then circulated to a condenser and then back to the pump.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: May 7, 2013
    Assignee: Parker-Hannifin Corporation
    Inventors: Abhijit Ashok Sathe, David Scott Gill, Robert Dale Thompson
  • Patent number: 8284004
    Abstract: A method for cooling a transformer and transformer apparatuses are implemented. A transformer apparatus, according to one embodiment, comprises: a conduction cooled electrical transformer (240) mounted to a cold plate (252); and a heat pipe (262) for supplementing cooling of the transformer (240), the heat pipe (262) comprising a first end (303), a second end (305), and a sealed low pressure cavity containing an amount of a fluid (311), wherein the first end (303) of the heat pipe (262) is located in a hot region of the transformer (240), the second end (305) is maintained colder than the first end (303) by contact with the cold plate (252), and heat produced at the first end (303) by operation of the transformer (240) is moved to the second end (305) by a closed loop vapor cycle in the sealed low pressure cavity using the fluid (311) of the heat pipe (262).
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: October 9, 2012
    Assignee: Honeywell International Inc.
    Inventor: Don A Tegart
  • Publication number: 20120044032
    Abstract: A pumped loop cooling system is provided to cool a hollow winding of a transformer utilizing a two phase vaporizable dielectric refrigerant. A liquid refrigerant pump circulates the refrigerant into a transformer and through a copper tube winding of the transformer where the refrigerant at least partially vaporizes in removing heat from the transformer. The refrigerant is then circulated to a condenser and then back to the pump.
    Type: Application
    Filed: May 26, 2010
    Publication date: February 23, 2012
    Inventors: Abhijit Ashok Sathe, David Scott Gill, Robert Dale Thompson
  • Publication number: 20100156583
    Abstract: The invention relates to a winding element (200) for conducting current, forming a component of a coil winding (132, 133; 408, 409), especially of a (welding) transformer winding, comprising fixing means (205) for fixing the winding element (200) to a carrier component (402, 403, 404). The invention also relates to a transformer arrangement (100; 600), especially a welding transformer arrangement, comprising a primary winding (132; 408) and a secondary winding (133; 409), the primary winding (132; 408) and/or secondary winding (133; 409) comprising at least one winding element (200) according to the invention.
    Type: Application
    Filed: December 22, 2007
    Publication date: June 24, 2010
    Inventors: Anton Solar, Thomas Klinger, Beno Klopcic, Rado Lisjak
  • Publication number: 20090322460
    Abstract: The present invention relates to a novel structure of a transformer for a high-frequency switching-type direct-current (DC) rectifier, and particularly to an improved structure of a transformer applicable to a large-current low-voltage high-frequency switching-type rectifier, wherein the transformer is comprised of a ring-shaped iron core (made of materials such as dust core or nanometer crystalline silicon or amorphous silicone), which is provided with a primary side formed with winding(s) of copper wire(s), coupling with a secondary side that is formed with a newly-developed module or block, which replaces the secondary side that was constructed to provide output with copper wires or copper plate with wire wound thereon. A cooling water tube is arranged in the secondary-side module to remove heat with the water so as to maintain normal temperatures of the transformer in a pollution-free manner with reduced size and weight and easy assembling and reduced costs of the transformer.
    Type: Application
    Filed: June 25, 2008
    Publication date: December 31, 2009
    Inventor: Hsun-I LIN
  • Publication number: 20090121818
    Abstract: An air core inductor includes an inductor member formed in a plurality of coils. The inductor member includes a first end portion, a second end portion and a hollow core portion. The air core inductor also includes at least one stray flux inhibiting member provided on one of the first and second end portions of the inductor member. The stray flux inhibiting member blocks stray magnetic flux emanating from the air core inductor.
    Type: Application
    Filed: November 13, 2007
    Publication date: May 14, 2009
    Applicant: GENERAL ELECTRIC COMPANY
    Inventor: Robert Gregory WAGONER
  • Publication number: 20090102588
    Abstract: A copper tube with copper end pieces for a water-cooled secondary winding of a welding transformer is an example of a brazed assembly having a potentially corrodible side, the water-cooled side, and a low-exposure side, the air side or dry side, of the joined pieces. By shaping contacting surfaces of the parts at the brazed joint it is useful to form a barrier, for example, between a special braze material required for the corrosive side and a conventional, easy to apply, braze material for use on the air side of the joint.
    Type: Application
    Filed: October 23, 2007
    Publication date: April 23, 2009
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: David R. Sigler, Anil K. Sachdev, James G. Schroth
  • Patent number: 7140420
    Abstract: In one aspect, the present invention is a cooling assembly for an electrical component. The assembly includes a non-magnetic, thermally conducting spreader substrate, and at least one serpentine cooling tube disposed on and in thermal contact with the thermally conducting spreader substrate so that said substrate is cooled when the one or more serpentine cooling tubes are operating.
    Type: Grant
    Filed: November 5, 2003
    Date of Patent: November 28, 2006
    Assignee: General Electric Company
    Inventors: Mehmet Arik, Kenneth William Rohling, Ronald Dean Watkins
  • Patent number: 7078994
    Abstract: A coil apparatus is described that incorporates two or more conductors, wound in parallel, following the same path, in intimate physical contact throughout the path but electrically isolated. The current applied to each of the coils can be selected independently. The field generated by the coil, or force on the coil in a magnetic field, is proportional to the algebraic sum of the currents. The power applied to the coil is proportional to the sum of square of the currents. By independently selecting the appropriate current's to apply to each of the conductors, a desired field, or force, can be generated by the coil for any desired power applied to the coil. By judiciously selecting appropriate currents to apply to each of the conductors, a range of fields, or forces, may be selected for which a constant power may be applied to the coil. A constant power enables the coil to operate at a constant temperature.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: July 18, 2006
    Inventors: Glenn Henry Martin, Ronald L Rohde, John O. H. Nisownger
  • Patent number: 6956189
    Abstract: An induction heating system having a fluid cooling unit, a power source, an induction heating device, a controller, and an alarm system to place the system in a safe condition when an improper operating condition is detected. The induction heating system may have a flow switch to detect fluid flow through the system. The system may operate to secure power to the induction heating device when cooling flow is inadequate. Alternatively, the system may increase fluid flow to provide adequate cooling flow. The controller may have a visual indicator of inadequate flow or an improper power source operating condition.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: October 18, 2005
    Assignee: Illinois Tool Works Inc.
    Inventor: Paul D. Verhagen
  • Patent number: 6741152
    Abstract: A directly cooled magnetic coil, particularly a gradient coil for a magnetic resonance apparatus, has the conductors forming the windings which are provided with an inner cooling channel for conducting a cooling fluid therethrough, and the conductors are fashioned as profiled segment conductors whose individual profiled segments surround a cooling tube. The cooling tube is composed of material that is not electrically conductive, or is only slightly electrically conductive, particularly a flexible plastic.
    Type: Grant
    Filed: September 2, 1999
    Date of Patent: May 25, 2004
    Assignee: Siemens Aktiengesellschaft
    Inventors: Winfried Arz, Stefan Stocker
  • Patent number: 6727483
    Abstract: A method and apparatus for inducing heat within a workpiece. A flexible fluid-cooled induction heating cable is used to produce a magnetic field to induce electric current in a workpiece. The induction heating cable has separate fluid and electrical connectors to separately couple cooling fluid and electric current to and from the induction heating cable. An induction heating system having a fluid cooling unit, a power source, and a flexible fluid-cooled induction heating cable having separate fluid and electrical connectors. An extension cable may be used to enable the flexible fluid-cooled induction heating cable to be used at a greater distance from the power source and the fluid cooling unit. An insulation blanket adapted for use with a specific size workpiece may be used with the flexible fluid-cooled induction heating cable.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: April 27, 2004
    Assignee: Illinois Tool Works Inc.
    Inventors: Jeffrey R. Thomas, Randall G. Baxter, Mark A. Ulrich, Paul D. Verhagen
  • Patent number: 6531942
    Abstract: This invention relates to a method of cooling an immersed induction coil, such as an ionizing coil used in a vacuum processing chamber. The coil 10 may comprise a coiled hollow tube 11 through which coolant can flow when pumped by a pump 13. A valve 16 is provided so that air can be passed through the tube in either direction and the direction of flow is controlled by a controller 19, which acts on the valve 16. The rate of switching of the valve 16 can be determined by a process condition or by monitoring the temperature of the downstream coolant and/or the coil.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: March 11, 2003
    Assignee: Trikon Holdings Limited
    Inventors: Ian Moncrieff, Clive Luca Widdicks
  • Patent number: 6518868
    Abstract: An inductor for a computer power supply module is provided. The inductor includes a one-piece, single turn winding formed of a material for conducting heat and electrical current. The material having at least about five times the amount of electrically conductive material necessary for conducting electrical current.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: February 11, 2003
    Assignee: Galaxy Power, Inc.
    Inventors: Gerald Miller, William Ng, Bernhard Schroter
  • Patent number: 6323469
    Abstract: A fluid cooled electric conductor for induction heating of a workpiece includes a flexible conductor which is enclosed within an insulating tube. The conductor is supported within the tube so as to be surrounded by a fluid conducting space or spaces. A support arrangement supports the tube. Temperature sensors adjust the heating process by, for example, operating variable-length holders that support the tube in a spaced relationship with a workpiece.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: November 27, 2001
    Assignee: G.H. Induction Deutschland Induktions-Erwaermungs-Anlagen GmbH
    Inventors: Richard J. Bissdorf, Werner K. Harnisch
  • Patent number: 5808535
    Abstract: A high frequency water cooled transformer for coupling a power source to an induction heating coil and which serves to convert the output of the power source into values appropriate for the induction heating coil, and to match the impedance of the power source with the impedance of the heating coil for maximum power transfer efficiency. The primary of the transformer is adapted to be connected to the power source and the secondary is adapted to be connected to the induction heating coil. The transformer includes a secondary formed of two parallel self-supporting elongated open-ended hollow electrically conductive cylindrical members. A pair of electrically conductive terminal blocks are respectively mounted on one of the ends of the cylinders and electrically connected to the cylinders. The primary winding is wound longitudinally through the two secondary cylinders, and the ends of the primary winding are connected to appropriate terminal pins.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: September 15, 1998
    Assignee: L. C. Miller Company
    Inventor: Victor E. Delucia
  • Patent number: 5748013
    Abstract: A magnetic core includes a body made of polycrystalline ceramic and at least one localized gap made of a composite magnetic material. The gap may be preferably fixedly joined to the body by bonding or molding. The magnetic core has applications in inductors or transformers. The inductor preferably has a coil located on the body, which coil is preferably made of multistranded enameled wires.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: May 5, 1998
    Assignee: Thomson-CSF
    Inventors: Fran.cedilla.ois Beauclair, Jean-Pierre Delvinquier, Richard Lebourgeois, Michel Pate, Claude Rohart
  • Patent number: 5744784
    Abstract: Described is a low-loss induction coil for heating and/or melting metallic materials, the coil having windings formed by lengths of hollow tubing carrying a fluid coolant. In the central zone of the induction coil, the current is carried by hollow conductors made of copper which at the same time form the hollow tubing. Fitted at least in the windings at one end of the coil is a current-carrying element in the form of at least one braid whose individual conductors are insulated from each other, while remaining windings are designed as hollow conductors connected to the current-carrying element. The use of braids as the current carrier leads, at the end of the coil, to a reduction in eddy-current losses caused by transverse magnetic fields, while the use of hollow conductors in the rest of the coil results in the mean distance between the current flux and the metallic material being heated being kept at the minimum and losses due to this distance thus kept low.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: April 28, 1998
    Assignee: Otto Junker GmbH
    Inventor: Dieter Schluckebier
  • Patent number: 5691685
    Abstract: A high frequency water cooled transformer for coupling a power source to an induction heating coil and which serves to convert the output of the power source into values appropriate for the induction heating coil, and to match the impedance of the power source with the impedance of the heating coil for maximum power transfer efficiency. The primary of the transformer is adapted to be connected to the power source and the secondary is adapted to be connected to the induction heating coil. The transformer includes a secondary formed of two parallel self-supporting elongated open-ended electrically conductive cylindrical members which are separated and insulated from one another. A pair of electrically conductive terminal blocks are respectively mounted on one of the ends of the cylinders and electrically connected to the cylinders. The primary winding is wound longitudinally through the two secondary cylinders, and the ends of the primary are connected to appropriate terminal pins.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: November 25, 1997
    Inventor: Victor E. Delucia
  • Patent number: 5682292
    Abstract: The invention relates to a liquid-cooled valve reactor, in particular for a high-voltage DC transmission installation, including a reactor core (2) and a reactor coil (4), the reactor coil (4) including a primary winding (24), which comprises two cooled winding sections (30, 32), and a secondary winding (26), and the reactor core (2) being provided with a plastic jacket (14). According to the invention, the reactor core (2) is provided with a clamping frame (56) which has on its free surfaces (58) in each case a heat dissipator (60), a liquid-cooled secondary resistor (28) is provided, which is connected electrically in parallel to the secondary winding (26), and the encapsulated reactor core (2) and the reactor coil (4) are mounted on a baseplate (6). The result is an intensively cooled valve reactor.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: October 28, 1997
    Assignee: Siemens Aktiengesellschaft
    Inventor: Tibor Salanki
  • Patent number: 5473302
    Abstract: An improved narrow profile transformer and method of making is disclosed comprising a primary winding and a secondary winding with the secondary winding being interleaved with the primary winding. The primary and secondary windings are spiral winding with all portions of the primary and secondary windings intersecting a geometric plane extending through the narrow profile transformer. The primary and secondary windings of the narrow profile transformer may be encapsulated within a polymeric material.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: December 5, 1995
    Assignee: Top Gulf Coast Corporation
    Inventors: William E. Terlop, Serge Casagrande
  • Patent number: 5446269
    Abstract: Electrically conductive tubing for realizing induction coils having improved efficiencies comprises an outer peripheral portion of conductive material defined by a plurality of side walls and a single hollow passageway. Each side wall has an inner and outer surface. At least one side wall has a curved outer surface. The hollow passageway is defined by the inner surfaces and can be either centered within the tubing or spaced apart from the center of the tubing. The present invention also defines an induction coil and an induction furnace having an induction coil which utilizes such tubing. The curved outer surface has a radius of curvature which is defined substantially by a function of the tubing width in the axial direction, and spacing between turns of the induction coil. The cross section of the outer surface of the outer peripheral portion of the tubing taken along a transverse axis of the tubing defines a geometric figure.
    Type: Grant
    Filed: May 27, 1993
    Date of Patent: August 29, 1995
    Assignee: Inductotherm Corp.
    Inventors: Vitaly Peysakhovich, Oleg S. Fishman
  • Patent number: 5430426
    Abstract: A pancake-type transformer particularly suited for connection to an inductor for inductively heating crankshafts is comprised of a single turn secondary defined by a plurality of generally U-shaped tubular conductors interleaved between the turns of a tubular, multiturn primary conductor having opposite ends connectable across a source of power. The conductors of the secondary have opposite ends each interconnected with a corresponding one of a pair of terminal blocks connected to a tubular inductor. The terminal blocks are outwardly adjacent the primary and secondary conductor portions at one end of the transformer and include corresponding current collectors which extend inwardly across the opposite sides of the conductor portions at the one end of the transformer. Coolant for flow through the secondary conductors is communicated with the opposite ends thereof through coolant passageways in the current collectors.
    Type: Grant
    Filed: September 13, 1993
    Date of Patent: July 4, 1995
    Assignee: Tocco, Inc.
    Inventor: Arthur H. Griebel
  • Patent number: 5410134
    Abstract: A clamp assembly includes a yoke having a rectangular configuration and circumscribes a rectangular space, and a pair of spaced electrically conductive terminal bodies mounted in the rectangular space of the yoke. The terminal bodies are adapted to be connected to corresponding electrical terminals of an induction heating machine. A clamp pad is slidably mounted in the rectangular space of the yoke and is moveable vertically toward and away from the tops of the terminal bodies. An induction coil assembly including a hollow induction coil and a pair of spaced parallel elongated terminal bars is provided, with the terminal bars removably clamped between the clamp pad and the tops of the terminal bodies.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: April 25, 1995
    Assignee: L.C. Miller Company
    Inventors: Alexander Marcut, Victor E. DeLucia
  • Patent number: 5391863
    Abstract: A hollow electrical conductor coolable to extremely low temperatures is disclosed. The conductor is hollow and has a connection for the introduction of extremely cold gases in a liquid or gaseous state and an outlet for the gases. At least one hose element (5; 24) is arranged in the hollow conductor (1; 19; 22; 23) and is connected to a gas connection and provided with perforations (6) to allow the gas to pass out. The hollow conductor (1; 19; 22; 23) is useful as an induction coil for induction furnaces for heating, keeping hot or melting metallic material. The external diameter of the hose element (5; 24) is smaller than the internal diameter of the hollow conductor (1; 19; 22; 23). The hollow conductor has passages (6a) in the wall to allow the gas to pass out and is fitted with a jacket (8) which provides an annular clearance to the hollow conductor and the gas emerging from the hollow conductor (1; 19; 22; 23) is collected and carried away.
    Type: Grant
    Filed: June 22, 1993
    Date of Patent: February 21, 1995
    Inventor: Edwin Schmidt
  • Patent number: 5119058
    Abstract: Method for fabricating a laminated coil conductor for a high current coil which includes wrapping a layer of insulation around a rotatable shaped mandrel and then winding a plurality of copper sheets over the insulation as the mandrel is rotated. Solder is interposed between the copper sheets and between coolant tubes positioned on each end of each coil conductor. The assemblage is then removed from the mandrel and raised to a temperature to bond the copper sheets and coolant tubes together. The assemblage is then placed in a structural box and a plastic is injected into the box to fill any voids between the coil conductor and the box.An assembly of a plurality of coil conductors arranged in a high current coil according to the method is illustrated.
    Type: Grant
    Filed: June 14, 1991
    Date of Patent: June 2, 1992
    Assignee: General Dynamics Corporation, Space Systems Division
    Inventors: Robert W. Baldi, Thomas E. Johnson
  • Patent number: 5109208
    Abstract: There is disclosed a current limiting electrical reactor that efficiently uses space. The reactor includes a supporting core with a circular periphery where the conductor is wound about the periphery of the coil in a convoluted spiral that spirals laterally out from the periphery of the core over itself, and lies in a radial plane passing through the core. A first terminal, adapted for electrical connection, is positioned at the beginning of the innermost turn of the conductor. A second terminal, also adapted for electrical connection, is positioned at the end of the outermost turn of the electrical conductor. Insulation is provided between adjacent turns of the conductor. This reactor configuration provides an electrical path along the conductor between the first and second terminals having a current limiting reactance.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: April 28, 1992
    Assignee: General Electric Canada Inc.
    Inventor: George E. Murison
  • Patent number: 5050293
    Abstract: Method for fabricating a laminated coil conductor for a high current coil which includes wrapping a layer of insulation around a rotatable shaped mandrel and then winding a plurality of copper sheets over the insulation as the mandrel is rotated. Solder is interposed between the copper sheets and between coolant tubes positioned on each end of each coil conductor. The assemblage is then removed from the mandrel and raised to a temperature to bond the copper sheets and coolant tubes together. The assemblage is then placed in a structural box and a plastic is injected into the box to fill any voids between the coil conductor and the box.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: September 24, 1991
    Assignee: General Dynamics Corporation/Space Systems Div.
    Inventors: Robert W. Baldi, Thomas E. Johnson
  • Patent number: 5049840
    Abstract: The invention relates to a cooling device for circuit configurations in which high electrical energies are converted and specifically for electrical matching circuits with which the impedance of a plasma path is matched to a high frequency generator. Herein one or several coils are provided with a water cooling system in such a way that the cooling water is completely separated from the electromagnetic fields through metallic material. These coils consist of two tubes slid one into the other, wherein the cooling water is fed and drawn through the internal tube and between the two tubes so that it is completely within the field-free region.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: September 17, 1991
    Assignee: Leybold Aktiengesellschaft
    Inventors: Roland Gesche, Stefan Locher
  • Patent number: 4980972
    Abstract: A cryogenically coolable inductive coil including: a multicomponent conductor comprising a plurality of components, each component including a cable of conductive material having a longitudinal axis about which the cable is twisted, the cable being wrapped helically and being compacted, after wrapping, to minimize voids in the cable and to give the component a polygonal profile, the components being disposed parallel, and adjacent, to one another with mutually facing sides of adjacent components being in contact with one another; and an electrical insulating and support structure at least partially surrounding the conductor for supporting stresses induced in the conductor due to magnetic fields created by the flow of current through the conductor, the conductor and the structure being wound to form the coil.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: January 1, 1991
    Assignee: Westinghouse Electric Corp.
    Inventors: Sharad K. Singh, Donald T. Hackworth
  • Patent number: 4912446
    Abstract: A cryogenically coolable inductive coil including: a multicomponent conductor comprising a plurality of components, each component including a cable of conductive material having a longitudinal axis about which the cable is twisted, the cable being wrapped helically and being compacted, after wrapping, to minimize voids in the cable and to give the component a polygonal profile, the components being disposed parallel, and adjacent, to one another with mutually facing sides of adjacent components being in contact with one another; and an electrical insulating and support structure at least partially surrounding the conductor for supporting stresses induced in the conductor due to magnetic fields created by the flow of current through the conductor, the conductor and the structure being wound to form the coil.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: March 27, 1990
    Assignee: Westinghouse Electric Corp.
    Inventors: Sharad K. Singh, Donald T. Hackworth
  • Patent number: 4906960
    Abstract: A distribution transformer and a method of making same. The transformer has at least one closed magnetic circuit in the form of a hollow toroidal coil made from ferro-magnetic steel ribbon. An electric circuit is formed by a primary winding and a secondary winding each constituted by one or more sub-assemblies in the form of a double pancake. These double pancakes are juxtaposed and molded together in a solid insulating material to form a rigid insulating frame on which the magnetic circuit is wound to form one or more magnetic coils. The rigid insulating frame, which is constituted by the primary and secondary windings and the insulating material, also includes therein conduits capable of circulating a cooling fluid through the windings whereby to provide heat exchange to cool the assembly of the electrical and magnetic circuits.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: March 6, 1990
    Assignee: Hydro-Quebec
    Inventor: Nicolai Alexandrov
  • Patent number: 4884409
    Abstract: The torodial ring magnet is cooled by a gaseous cooling medium which is conducted through a first cooling circuit through the channels of the magnet coils of the magnet. The gaseous cooling medium exiting the magnet is cooled by a second liquid cooling medium in a second cooling circuit within an auxiliary cooler. Temperature sensors are provided to sense the temperature of the exiting gaseous cooling medium from the magnet sections to permit the opening or closing of a valve in the auxiliary cooler to cause the gaseous coolant to be cooled or not by the liquid cooling medium.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: December 5, 1989
    Assignee: Sulzer Brothers Limited
    Inventors: Hans Quack, Antonio Angelini
  • Patent number: 4874916
    Abstract: Improved electric induction heating apparatus wherein the coil has two or more windings of special low loss conductor with such windings electrically connected in parallel. The two or more windings can be wound simultaneously one on top of the other and/or disposed radially one outside of the other. The coil windings embedded in a rigid set resinous material thus providing a rigid cylindrical unit. At least one of the coil windings has the low loss conductor around a tube the latter providing a fluid flow path for circulatig cooling fluid therethrough by at least one of current balancing transformers, transposition of the windings, and appropriately choosing the number of turns of each coil layer. A split ring bus can be used at the ends of the coils to connect the windings in parallel and laminated steel yokes can be disposed about the coil.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: October 17, 1989
    Assignee: Guthrie Canadian Investments Limited
    Inventor: Patrick E. Burke
  • Patent number: 4817706
    Abstract: A coil designed for providing a highly uniform magnetic field suitable for use in nuclear magnetic resonance computer-aided tomography is provided with preheating apparatus which uses forced circulation of warmed liquid along the path normally circulated with the cooling liquid whereby there are simulated the normal operating coil heating conditions even when the coil is not operating so that the start-up stabilization time can be shortened.
    Type: Grant
    Filed: January 7, 1987
    Date of Patent: April 4, 1989
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Miyama Harumi, Haruo Ono
  • Patent number: 4775848
    Abstract: A compact valve choke that is simple to manufacture, which can, however, ensure the qualities required for all operating modes, namely the needed dielectric strength and freedom from partial discharges between components that are at different voltages. This valve-choke is achieved by having: the choke windings arranged in a supporting frame in a self-supporting manner, in relation to one leg of the choke core; the choke windings potted on all sides, and the potted block supported in the supporting frame by means of fittings; the choke core consists of two generally circular-shaped cores and is secured in the supporting frame; and the choke coil includes two primary windings wound in two layers, with an outer first winding portion and a concentric inner second winding portion as well as, a core-potential center tap roughly in the center of the windings between the first winding portion and the second winding portion.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: October 4, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Reinhold Sundermann, Paul Kukert, Tibor Salanki
  • Patent number: 4739296
    Abstract: A current transformer has a hollow tube made from an electrical conductor which is bent at its center so as to form a loop which functions as a primary winding and two parallel straight portions at the ends of the tube which function as leads for the primary winding. The tube has a longitudinally-extending fluid-carrying passageway for a dielectric fluid formed at its center. Both ends of the tube are open and communicate with the inside of a reservoir for a dielectric fluid. A longitudinally-extending electrically-insulating member is inserted into the fluid-carrying passageway of one of the straight portions of the tube so as to decrease the cross-sectional area of the passageway in that portion and increase its resistance to flow. The increase in flow resistance produces a temperature difference within the tube, promoting circulation of the dielectric fluid by convection.
    Type: Grant
    Filed: December 9, 1986
    Date of Patent: April 19, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Takeo Fukatsu
  • Patent number: 4692560
    Abstract: In a forced flow cooling-type superconducting coil apparatus including a superconducting coil having superconducting wires inserted into a hollow conduit, current leads for supplying a current to said superconducting coil, and cooling means for cooling said superconducting wires by forcibly flowing the coolant through said hollow conduit, a part of the coolant flowing through said cooling means is branched to cool said current leads.
    Type: Grant
    Filed: July 16, 1986
    Date of Patent: September 8, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiji Hotta, Kunishige Kuroda, Hiroshi Kimura, Nobuhiro Hara, Naofumi Tada
  • Patent number: 4663604
    Abstract: A coil assembly includes a first winding for circumferentially surrounding at least a portion of a leg of a transformer core, a second winding spaced from and circumferentially surrounding at least a portion of the first winding, first supports, such as axially extending insulative rods, disposed between the first and second winding, for inhibiting axial motion of the second winding relative to the first winding and a second support disposed about at least a portion of the outer periphery of the second winding for inhibiting radial motion of the second winding relative to the first winding. Encapsulating material, such as an epoxy resin having glass fibers disposed therethrough, is disposed between the first winding and the leg, between the first and second winding and disposed about the second support for forming a monolithic structure. In a transformer including such a coil assembly, the leg and conductors forming the windings may be fluid cooled.
    Type: Grant
    Filed: January 14, 1986
    Date of Patent: May 5, 1987
    Assignee: General Electric Company
    Inventors: Thomas E. VanSchaick, Morris V. VanDusen, James M. Anderson
  • Patent number: 4584551
    Abstract: A transformer comprising a core, a primary winding and a secondary winding in which one of the windings, preferably the winding with the least coils, is formed from a tubular member formed in a plurality of coils; in the preferred embodiment of a step down transformer, the secondary winding is formed from a tubular member. A connector block at each end of the secondary winding includes an appropriate fluid passage and means for connecting a fluid coupling to the block so that the inlet and outlet of the fluid circulation system can be secured to the tubular member forming the secondary winding. The loops of the primary coil are interdigitally arranged with the loops of the secondary coil so that the fluid in the secondary coil absorbs heat from both the primary and secondary windings. Each loop of the secondary includes a bow so that adjacent ends of each loop of the primary are sandwiched between the bows.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: April 22, 1986
    Assignee: Marelco Power Systems
    Inventors: Peter H. Burgher, John L. Boomer
  • Patent number: 4577175
    Abstract: A transformer comprising a core, a primary winding and a secondary winding in which one of the windings, preferably the winding with the least coils, is formed from a tubular member formed in a plurality of coils in the preferred embodiment of a step down transformer, the secondary winding is formed from a tubular member. A connector block at each end of the secondary winding includes an appropriate fluid passage and means for connecting a fluid coupling to the block so that the inlet and outlet of the fluid circulation system can be secured to the tubular member forming the secondary winding. The connector blocks also include threaded apertures adapted to receive the bolt for providing an electrical connection to an electrical apparatus such as a welding gun. The loops of the primary coil are interdigitally arranged with the loops of the secondary coil so that the fluid in the secondary coil absorbs heat from both the primary and secondary windings.
    Type: Grant
    Filed: June 27, 1984
    Date of Patent: March 18, 1986
    Assignee: Marelco Power Systems
    Inventors: Peter H. Burgher, Raymond F. Marsden
  • Patent number: 4543552
    Abstract: A voltage dropping transformer for an electric welding machine, of the type in which the secondary circuit is formed by a wound strip, is provided wherein one or more cooling turns are incorporated or inserted in the windings of the primary and/or secondary circuits, separating them into several parts while being in thermal contact therewith. The turns are electrically inactive--having solely a cooling role--and do not form part of the electric circuits of the windings.
    Type: Grant
    Filed: June 8, 1983
    Date of Patent: September 24, 1985
    Assignee: ARO
    Inventor: Jean-Paul Fantou
  • Patent number: 4538279
    Abstract: A pancake induction heating coil for crucible-free zone melting of semiconductor crystal rods, includes a primary winding surrounding a semiconductor rod to be remelted in the form of a ring through which cooling liquid flows, a secondary winding surrounding the primary winding and having a side facing the semiconductor rod, and an energy concentrator lying in the plane of the primary winding and having a circular opening formed substantially in the center thereof for the semiconductor rod, the side of the secondary winding facing the semiconductor rod being electrically conductingly connected to the energy concentrator.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: August 27, 1985
    Assignee: Siemens Aktiengesellschaft
    Inventor: Wolfgang Keller
  • Patent number: 4535211
    Abstract: A single loop inductor for inductively heating elongated work pieces is machined including cooling passages for a single piece of electrically conductive material without fabricated joints between the conductor sections.
    Type: Grant
    Filed: October 24, 1984
    Date of Patent: August 13, 1985
    Assignee: Tocco, Inc.
    Inventor: Michael J. Carter