Patents by Inventor Jiing-Liang Wu

Jiing-Liang Wu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6952086
    Abstract: A control system for a linear motor adapted to accurately supply a moving window of power to the stator coils. A plurality of individually switched stator coils run the length of a linear motor to move a rotor down the long axis of the stator. Accurate inductive-based position sensors continuously provide position data for the moving rotor. A processing unit calculates a proper time delay from a source voltage peak in order to apply power to the next stator coil in the moving direction of the rotor such that no DC offshoot/undershoot occurs. The linear motor control system optionally includes a failure prevention switching scheme in which pairs of individual stator coils on opposite sides of a double-sided stator are switched together.
    Type: Grant
    Filed: October 10, 2003
    Date of Patent: October 4, 2005
    Assignee: Curtiss-Wright Electro-Mechanical Corporation
    Inventors: Mark Peter Krefta, David Jonathan Hall, Kenneth Martin Eichler, Jiing-Liang Wu, Robert E. Strickler, Michael Barnaby Brennen
  • Patent number: 5590536
    Abstract: A cryogenic bypass current lead to bypass quenched magnets in a string of magnets in a superconducting super collider comprises a HTSC section interposed between a lower conductive body terminal and the conductive of the lead is described.
    Type: Grant
    Filed: April 13, 1995
    Date of Patent: January 7, 1997
    Assignee: Northrop Grumman Corp.
    Inventor: Jiing-Liang Wu
  • Patent number: 5432297
    Abstract: A multiple circuit hybrid cryostat power lead has a plurality of laterally spaced, electrically isolated lead elements inside a tubular enclosure. Each lead element has an inner section with a high temperature superconducting (HTS) conductor inward of a divider in the tubular enclosure, and an outer normal conductor section outward of the divider. The outer sections of the lead elements have a pair of copper conductors spirally wound in an annular chamber between an electrically insulating central support and an electrically insulating sleeve to form helical flow passages. Cryogen vapor flows outward in the tubular enclosure inward of the divider over the HTS conductors, through a slotted heat exchanger electrically connecting the HTS and copper conductors at the divider, and through the helical flow passages to vents at outer terminals.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: July 11, 1995
    Assignee: Westinghouse Electric Corporation
    Inventors: Jeffrey T. Dederer, Jiing-Liang Wu
  • Patent number: 5298679
    Abstract: A vapor cooled current lead for a superconducting device located in a cryostat includes a normal conductor section extending from ambient conditions inward to an intermediate point, and a composite lead having a ceramic high temperature superconductor core with a metallic sheath extending between the normal conductor section and the superconducting device, preferably in a helical path to reduce heat leak by conduction. The metallic sheath is stripped away at spaced intervals, preferably adjacent the low temperature end of the composite lead, and the gaps are filled with a filler which provides mechanical strength for the core and reduces thermal conduction. A flow of cryogen vapor directed by a tubular housing maintains the high temperature superconducting material below its critical temperature, and cools the normal conductors.
    Type: Grant
    Filed: July 1, 1992
    Date of Patent: March 29, 1994
    Assignee: Westinghouse Electric Corp.
    Inventors: Jiing-Liang Wu, Jeffrey T. Dederer, Sharad K. Singh
  • Patent number: 5166776
    Abstract: A power lead for a cryostat has high temperature superconducting (HTSC) conductors extending inward toward a pool of liquid cryogen in the cryostat in series with normal conductors extending from the HTSC conductors to outside the cryostat. Tubular shrouds vented to atmosphere direct a flow of cryogen vapor along the HTSC conductors to maintain them superconducting, and along the normal conductors to remove Joule heat and heat leakage along the normal conductors. In one embodiment, a pool of liquid nitrogen maintained within a tubular inner shroud is the principal coolant for the normal conductors. Helium vapor is circulated over the HTSC conductors and is then directed by an outer tubular shroud around the inner tubular shroud to provide additional cooling for the normal conductors. Flexible connectors at one end of each of the HTSC conductors accommodate for individual thermal contractions of these conductors.
    Type: Grant
    Filed: October 20, 1990
    Date of Patent: November 24, 1992
    Assignee: Westinghouse Electric Corp.
    Inventors: Jeffrey T. Dederer, Jiing-Liang Wu
  • Patent number: 4975606
    Abstract: A projectile launch package for use in electromagnetic launching systems is provided with separable armature and projectile assemblies. The armature assembly includes a conductive element which initially conducts accelerating current. After a certain time, the conductive element fuses, thereby forming a plasma which further accelerates the projectile assembly. Following the plasma initiation, the armature assembly is expelled from the launcher under its own momentum.
    Type: Grant
    Filed: December 22, 1982
    Date of Patent: December 4, 1990
    Assignee: Westinghouse Electric Corp.
    Inventors: Jiing-Liang Wu, Douglas A. Fikse
  • Patent number: 4916998
    Abstract: An integrated switch-preaccelerator system for use in an electromagnetic launcher includes a pair of spaced generally parallel preaccelerator rails, a pair of spaced first and second conductive switch terminal elements disposed adjacent upstream ends of the rails, and three coaxially arranged conductive tubular members enclosing and extending axially along the rails, one of which being movable relative to the others between conducting and non-conducting positions.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: April 17, 1990
    Assignee: Westinghouse Electric Corp.
    Inventor: Jiing-Liang Wu
  • Patent number: 4739442
    Abstract: A connect/disconnect switch which is partially immersed in a cryogenic coolant includes colinearly arranged electrically conducting hollow cylinders separated by an electrically insulating as well as thermally insulating support member. An electrically conducting plug member is moveable within the cylinders with the cylinders being electrically connected to bus bars. During current flow operation, an electrical path is established between the hollow cylinders by means of the moveable plug whereas when a disconnect is desired, the moveable plug is removed from contacts with at least one of the cylinders thereby breaking the electrical as well as thermal path.
    Type: Grant
    Filed: December 18, 1986
    Date of Patent: April 19, 1988
    Assignee: Westinghouse Electric Corp.
    Inventors: Donald T. Hackworth, Jiing-Liang Wu, David Marschik
  • Patent number: 4727230
    Abstract: A safety switch for use in an inductively driven electromagnetic launcher system includes three tubular conductors each having a substantially cylindrical internal surface, wherein these internal surfaces have substantially the same internal diameter and are positioned at spaced locations along a common axis. A fourth tubular conductor having a cylindrical external surface with a diameter which is substantially equal to the internal diameters of the first three conductors. This fourth conductor is mounted for movement along the common axis such that its external surface is capable of making sliding electrical contact with the internal surfaces of the first three conductors. The external surface of the fourth conductors has sufficient axial length to be capable of making electrical contact with each of the internal surfaces simultaneously.
    Type: Grant
    Filed: January 9, 1987
    Date of Patent: February 23, 1988
    Assignee: Westinghouse Electric Corp.
    Inventor: Jiing-Liang Wu
  • Patent number: 4683353
    Abstract: An electrical switch for switching direct current in an inductively driven electromagnetic projectile launching system is provided with a rotor having a generally cylindrical conductive element with a first portion that includes a continuously conductive external surface. A second portion of the conductive element includes a pair of insulating members fixed at angularly spaced locations such that sections of the conductive elements and the insulating members alternate along the generally cylindrical surface of the elememt. One pair of angularly spaced retractable brush members extend radially inward toward and axially along the conductive surface of the first portion of the conductive element to make sliding electrical contact with the conductive element during the inductor charging phase of a launch sequence.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: July 28, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Jiing-Liang Wu, David W. Scherbarth, David Marschik
  • Patent number: 4644119
    Abstract: A rotary switch for switching large direct currents is provided with a rotating cylinder having a pair of electrically connected angularly spaced conductors. Retractable sliding contacts are provided to make contact with the rotor surface and an insulated slot arc chamber is provided to improve the rate of voltage rise when the switch opens. Two of these switches can be connected in parallel to provide a switching system for an electromagnetic projectile launcher wherein one switch conducts initial charging current to charge an inductive storage device then commutates that current to the second switch which subsequently commutates the current to the launcher load.
    Type: Grant
    Filed: March 19, 1984
    Date of Patent: February 17, 1987
    Assignee: Westinghouse Electric Corp.
    Inventor: Jiing-Liang Wu
  • Patent number: 4598263
    Abstract: A magnetically operated circuit breaker characterized by a circuit breaker structure including first and second separable contacts operable between open and closed positions, a releasable mechanism movable when released to a tripped position to effect automatic opening of the contacts, the first contact being connected to the releasable mechanism, the second contact being movable between open and closed positions of the first contact, and electromagnetic actuating means for moving the second contact between open and closed position in response to a control signal generated remotely from the circuit breaker.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: July 1, 1986
    Assignee: Westinghouse Electric Corp.
    Inventors: Carl J. Heyne, Nicholas A. Tomasic, Jiing-Liang Wu
  • Patent number: 4429295
    Abstract: A current limiting device including a housing in which a chamber is formed. A pair of spaced electrical terminals are located at opposite ends of the housing to be disposed in communication with the chamber. An electrically conductive fusible metal is disposed in the chamber to provide an electrically conductive path between the terminals. An insulating member is disposed in the chamber between opposite ends of the housing to define a flow passageway between the electrical terminals. The flow passageway may include a constricted portion that has a cross-sectional area and a length that is substantially less than the rest of the flow passageway defined by the insulating member such that with the occurrence of a fault current, vaporization of the fusible metal initially occurs in the constricted portion of the flow passageway. Expansion means are also provided for buffering the pressure rise in the chamber when the fusible metal is vaporized.
    Type: Grant
    Filed: November 13, 1981
    Date of Patent: January 31, 1984
    Assignee: Electric Power Research Institute, Inc.
    Inventor: Jiing-Liang Wu
  • Patent number: 4278860
    Abstract: A sulfur hexafluoride interrupter structure uses sulfur hexafluoride at supercritical pressure and includes two spaced pistons of different diameters disposed on opposite sides of the contact arcing region. The pistons are connected to a source of biasing force such as a spring and assume a static position dependent on the opposing force of the spring and of the differential pressure on the pistons. During contact interruption the initial arc between the separating contacts produces a high pressure in the contact space which is transmitted to the differential pistons and causes the pistons to move quickly in order to move fluid through the separating contacts. The piston biasing spring is also charged as the movable contact moves toward a disengaged position. High pressure surges created due to the arc energy are thus absorbed during the opening operation and a considerable part of the operating force needed to open the contacts and to move fluid is derived from the arc energy.
    Type: Grant
    Filed: August 3, 1979
    Date of Patent: July 14, 1981
    Assignee: Gould Inc.
    Inventor: Jiing-Liang Wu