Patents by Inventor Kiruba Sivasubramaniam
Kiruba Sivasubramaniam 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).
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Publication number: 20110301038Abstract: A system for cooling superconducting materials used for magnetization of magnets disposed within a cylindrical structure, the system including a first tubing system for allowing a cooling gas to interact with a high-field strength superconducting material to thermosiphon-cool the high-field strength superconducting material, a second tubing system for allowing a cooling gas to interact with a low-field strength superconducting material to thermosiphon-cool the low-field strength superconducting material, and a cooling gas in liquefied form configured to flow through the first tubing system and/or the second tubing system. An outlet of the first tubing system and an outlet of the second tubing system are located at a same location on a surface of the cylindrical structure. A method for cool superconducting materials used for magnetization of magnets disposed within a cylindrical structure is also disclosed.Type: ApplicationFiled: December 23, 2010Publication date: December 8, 2011Inventors: Ernst Wolfgang Stautner, Kiruba Sivasubramaniam Haran, James Rochford
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Publication number: 20110285219Abstract: The present application and the resultant patent provide a superconducting electrical machine. The superconducting electrical machine may include an armature coil made of a high temperature superconducting material, a cooling system, and a field coil. The cooling system may include a cryostat surrounding the armature coil and a foam insulation surrounding the cryostat.Type: ApplicationFiled: April 27, 2011Publication date: November 24, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Tao Zhang, Evangelos Laskaris, Manoj Shah, James Bray, Kiruba Sivasubramaniam Haran
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Publication number: 20110266807Abstract: An electric machine and stator assembly includes a segmented stator having stator portions. Each stator portion includes stator laminations, end plates arranged axially on opposing sides of the stator portion, and structural plates arranged interior to the end plates. Each of the support plates has a portion with notch-like structures that is embedded within the stator laminations. Stabilizing couple the end plates and the structural plates together. Connectors are provided to connect the stator portions together.Type: ApplicationFiled: August 30, 2010Publication date: November 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Kiruba Sivasubramaniam Haran, James Pellegrino Alexander, Jay Zhiqiang Cao, Evangelos Trifon Laskaris, Murtuza Lokhandwalla, Jeremy Daniel Van Dam, Robert Michael Zirin
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Publication number: 20110266808Abstract: An electric machine and a stator assembly include a segmented stator having stator portions. Each stator portion includes end plates arranged axially on opposing sides of the stator portion, support plates arranged interior to the end plates, stator laminations arranged between the support plates, and stabilizing elements coupling the end plates and the support plates together. Each of the stabilizing elements has a dovetail portion coupled to the end plates and to the support plates. Connectors are provided to connect the stator portions of the segmented stator together.Type: ApplicationFiled: August 30, 2010Publication date: November 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Murtuza Lokhandwalla, Kiruba Sivasubramaniam Haran, Robert Michael Zirin, Richard Nils Dawson, Mark John DeBlock, Randy Scott Longtin
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Publication number: 20110266909Abstract: The present application provides a segmented rotor. The segmented rotor may include a center wheel, a number of rotor support segments positioned about the center wheel, and a number of active rotor components positioned about each of the rotor support segments.Type: ApplicationFiled: July 28, 2010Publication date: November 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Murtuza Lokhandwalla, Kiruba Sivasubramaniam Haran, Daniel Erno, Robert Zirin
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Publication number: 20110266913Abstract: A stator assembly includes a segmented stator having stator portions. Each stator portion includes a support structure and dovetails, each coupled to the support structure by adjustable elements. The stator portion also includes stator laminations, where each of the laminations has openings to engage with the dovetails. Connectors are provided to connect the stator portions of the segmented stator together.Type: ApplicationFiled: October 29, 2010Publication date: November 3, 2011Applicant: GENERAL ELECTRIC COMPANY GLOBAL RESEARCHInventors: Robert Michael Zirin, Murtuza Lokhandwalla, Kiruba Sivasubramaniam Haran, Richard Nils Dawson, Mark John DeBlock
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Publication number: 20110236246Abstract: A method of producing a permanent magnet includes: melting boron, cobalt, a metallic alloy component, a mixed rare earth material, and iron together to form a melted alloy and forming a first alloy ingot using the melted alloy, wherein the permanent magnet comprises about 28-35 weight percent of rare earth material; crushing the first alloy ingot into particles having a first average particle diameter less than about 3 millimeters; milling the particles to form a powder mixture with a second average particle diameter in the range from about 2.Type: ApplicationFiled: June 10, 2011Publication date: September 29, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Shengzhi Dong, Kiruba Sivasubramaniam Haran, Chao Yang, Xingmin Liu, Shuai Guo, Bicheng Chen
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Publication number: 20110221552Abstract: The present disclosure is generally directed towards magnetization of permanent magnets using superconducting magnetizers. For example, in one embodiment, a superconducting magnetizer assembly is provided. The assembly includes a coil pack having an inner coil including a first superconducting magnet material, the coil being configured to generate a first magnetic field in response to an electric current supplied to the coil, and an outer coil including a second superconducting magnet material, the outer coil being disposed about the inner coil and being configured to generate a second magnetic field in response to an electric current supplied to the outer coil. The coil pack also includes a container configured to house the inner and the outer coils.Type: ApplicationFiled: January 14, 2011Publication date: September 15, 2011Applicant: General Electric CompanyInventors: James Humphrie Rochford, Kiruba Sivasubramaniam Haran, Ernst Wolfgang Stautner
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Patent number: 8018102Abstract: A superconducting field coil assembly includes a superconducting field coil disposed within a vacuum insulated electro-magnetic (EM) shielded cryostat. A water cooling jacket is thermally integrated with the outer surface of the EM shielded cryostat.Type: GrantFiled: August 11, 2008Date of Patent: September 13, 2011Assignee: General Electric CompanyInventors: Evangelos Trifon Laskaris, James Pellegrino Alexander, Kiruba Sivasubramaniam, Minfeng Xu
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Publication number: 20110140552Abstract: A stator assembly includes a segmented stator having stator portions. Each stator portion includes stator laminations having stator windings, spacer plates having a portion embedded within the stator laminations, and structural plates having a portion embedded within the stator laminations. The portion of each of the spacer plates and each of the structural plates has notch-like structures that create openings to allow a cooling medium to flow between the notch-like structures to provide radial cooling of the stator windings. Connectors are provided to connect the stator portions of the segmented stator together.Type: ApplicationFiled: September 29, 2010Publication date: June 16, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Murtuza Lokhandwalla, Jay Zhiqiang Cao, William Dwight Gerstler, Kiruba Sivasubramaniam Haran, Robert Michael Zirin, Xiaochum Shen
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Publication number: 20110133871Abstract: A superconducting magnetizer includes a thermal shield disposed within a vacuum chamber. A superconducting magnet is disposed within the thermal shield and configured to generate a magnetic field in response to an electric current supplied to the superconducting magnet. A heat transfer device comprising at least one of a thermal conduction device, and a heat pipe is disposed contacting the superconducting magnet. A cryocooler is coupled to the heat transfer device and configured to cool the superconducting magnet via the heat transfer device.Type: ApplicationFiled: May 25, 2010Publication date: June 9, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Ernst Wolfgang Stautner, Kiruba Sivasubramaniam Haran
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Publication number: 20110133590Abstract: A rotor structure for an interior permanent magnet (IPM) electromotive machine is provided. The rotor structure may include at least one rotor lamination, which in turn may include at least one slot arranged to receive at least one permanent magnet. The slot divides the rotor lamination into a pole region and a yoke region. At least one bridge is arranged to connect the pole region to the yoke region at an outer edge of the lamination. The outer edge of the lamination is profiled along a segment of the bridge to define a concave curved profile for the bridge. The concave curved profile for the bridge allows to selectively size a thickness of the bridge to affect at least some electromagnetic and/or mechanical characteristic of the machine.Type: ApplicationFiled: February 26, 2010Publication date: June 9, 2011Inventors: MURTUZA LOKHANDWALLA, Rammohan Rao Kalluri, Kiruba Sivasubramaniam Haran
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Publication number: 20110074530Abstract: A permanent magnet comprises boron, cobalt, a metallic alloy component, about 28-35 weight percent of mixed rare-earth material, and iron as a balance. The metallic alloy component is selected from the group consisting of aluminum, copper, niobium, gallium, vanadium, chromium, zirconium, and combinations thereof. The mixed rare-earth material comprises light rare-earth material and heavy rare-earth material. The light rare-earth material comprises at least about 50 weight percent of praseodymium and about 5-50 weight percent of neodymium. The heavy rare-earth material comprises dysprosium or a combination of dysprosium and terbium. The mixed rare-earth material comprises about 3-45 weight percent of heavy rare-earth material. A sum of intrinsic coercivity in the unit of kilo Oersted (kOe) and maximum energy product in unit of mega gauss Oersteds (MGOe) of the permanent magnet is at least about 55.Type: ApplicationFiled: September 30, 2009Publication date: March 31, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Shengzhi Dong, Kiruba Sivasubramaniam, Chao Yang, Xingmin Liu, Shuai Guo, Bicheng Chen
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Publication number: 20110037545Abstract: A magnetizer for magnetizing permanent magnets positioned in-situ a mechanical member is disclosed. The magnetizer comprises at least one primary superconducting coil configured to project a magnetic field flux configuration of a first type to at least a portion of a distal volume of a first type, and at least two auxiliary coils symmetrically disposed about the at least one primary superconducting coil and configured to project magnetic field flux configurations of a second type to at least a portion of a distal volume of a second type. A method of magnetizing a permanent magnet in-situ within a mechanical member is also disclosed.Type: ApplicationFiled: August 12, 2009Publication date: February 17, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Kiruba Sivasubramaniam, Patrick Lee Jansen, Ernst Wolfgang Stautner
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Patent number: 7821164Abstract: A generator including: an annular armature connectable to rotate with blades of a wind turbine; an annular stationary field winding assembly coaxial with the armature and separated by a gap from an inside surface of the armature, wherein the field winding include superconducting coils, and support structure connectable to an upper region of a tower of the wind turbine.Type: GrantFiled: February 15, 2007Date of Patent: October 26, 2010Assignee: General Electric CompanyInventors: Evangelos Trifon Laskaris, Kiruba Sivasubramaniam
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Publication number: 20100199488Abstract: An electrical machine includes a stator and a rotor. The stator has a central opening that is configured to receive the rotor. The rotor includes a generally cylindrical first section comprising a first material mounted on an axially extending shaft within the central opening. The rotor further includes a second section having a second material of a predetermined thickness that is plated integrally over at least a portion of the first section. The second material has a higher electrical conductivity relative to the first material.Type: ApplicationFiled: April 16, 2010Publication date: August 12, 2010Applicant: General Electric CompanyInventors: James William Bray, Kiruba Sivasubramaniam, Manoj Ramprasad Shah
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Patent number: 7724483Abstract: A system for protecting superconducting generator field coils including a controller configured to monitor for a quenching of a superconducting field coil of a generator and control a dissipation of a current flow in the superconducting field coil in an event of the quenching, and an armature coil of the generator configured to cause the dissipation of the current flow in the superconducting field coil responsive to the controller in the event of the quenching of the superconducting field coil. A method for protecting superconducting generator field coils including monitoring for a quenching of a superconducting field coil of a generator, and dissipating a current flow in the superconducting field coil via an armature coil of the generator in response to a detection of the quenching.Type: GrantFiled: March 19, 2008Date of Patent: May 25, 2010Assignee: General Electric CompanyInventors: James William Bray, Patrick Lee Jansen, Evangelos Trifon Laskaris, Kiruba Sivasubramaniam
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Patent number: 7723894Abstract: An electrical machine includes a stator and a rotor. The stator has a central opening that is configured to receive the rotor. The rotor includes a generally cylindrical first section comprising a first material mounted on an axially extending shaft within the central opening. The rotor further includes a second section having a second material of a predetermined thickness that is plated integrally over at least a portion of the first section. The second material has a higher electrical conductivity relative to the first material. In certain embodiments, the electrical machine may include a stator support structure having a clamping member comprising a first material and configured to rigidly position the stator around the rotor. The stator support structure further includes an electrically conductive layer comprising a second material plated integrally over the clamping structure, wherein the second material has a higher electrical conductivity relative to the first material.Type: GrantFiled: December 20, 2004Date of Patent: May 25, 2010Assignee: General Electric CompanyInventors: James William Bray, Kiruba Sivasubramaniam, Manoj Ramprasad Shah
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Patent number: 7705701Abstract: A composite sealed vessel is provided. The vessel includes a non-metallic, generally cylindrical inner containment piece, a non-metallic, generally cylindrical outer containment piece disposed around the inner containment piece. A pair of non-metallic flanges are disposed at ends of the inner and outer containment pieces to form a closed structure defining a cavity therein. The vessel also includes a metallic external lining disposed over the closed structure to form a leak-tight pressure boundary.Type: GrantFiled: July 15, 2005Date of Patent: April 27, 2010Assignee: General Electric CompanyInventors: Xianrui Huang, William Daniel Barber, Paul St. Mark Shadforth Thompson, Evangelos Trifon Laskaris, Kiruba Sivasubramaniam
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Publication number: 20100096944Abstract: A technique for winding multi-turn, stranded wire coils using rectangular cables avoids the risk of damage associated with edge-wise bends.Type: ApplicationFiled: October 22, 2008Publication date: April 22, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Kiruba Sivasubramaniam, Patrick Lee Jansen, Gary Randall Barnes, Jessica Mary Brower, Stephen Bertram Johnson