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).
-
Patent number: 8541919Abstract: 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: GrantFiled: February 26, 2010Date of Patent: September 24, 2013Assignee: General Electric CompanyInventors: Murtuza Lokhandwalla, Rammohan Rao Kalluri, Kiruba Sivasubramaniam Haran
-
Patent number: 8492951Abstract: 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: GrantFiled: October 29, 2010Date of Patent: July 23, 2013Assignee: General Electric CompanyInventors: Robert Michael Zirin, Murtuza Lokhandwalla, Kiruba Sivasubramaniam Haran, Richard Nils Dawson, Mark John DeBlock
-
Patent number: 8471660Abstract: A superconducting magnetizer assembly includes a coil pack including an inner coil configured to generate a first magnetic field in response to an electric current supplied to the inner coil, an outer coil being disposed about the inner coil and configured to generate a second magnetic field in response to an electric current supplied to the outer coil, a non-conductive end spacer disposed between an end winding of the inner coil and an end winding of the outer coil, and a container to house the inner and outer coils; and a yoke disposed proximate the coil pack being configured to constrain the first and second magnetic fields to reduce the strength of the first field at the end winding of the inner coil, wherein the yoke comprises an annular ring configured to at least partially envelop the coil pack.Type: GrantFiled: December 5, 2012Date of Patent: June 25, 2013Assignee: General Electric CompanyInventors: James Humphrie Rochford, Kiruba Sivasubramaniam Haran, Ernst Wolfgang Stautner
-
Patent number: 8456048Abstract: 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: GrantFiled: September 29, 2010Date of Patent: June 4, 2013Assignee: General Electric CompanyInventors: Murtuza Lokhandwalla, Jay Zhiqiang Cao, William Dwight Gerstler, Kiruba Sivasubramaniam Haran, Robert Michael Zirin, Xiaochun Shen
-
Patent number: 8436499Abstract: 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: GrantFiled: April 27, 2011Date of Patent: May 7, 2013Assignee: General Electric CompanyInventors: Tao Zhang, Evangelos Laskaris, Manoj Shah, James Bray, Kiruba Sivasubramaniam Haran
-
Publication number: 20130099503Abstract: An electrical machine stator is disclosed that includes a stack of laminations configured to be assembled together so as to define at least one stator tooth. Each lamination may include an inner edge, an outer edge and first and second side edges extending at least partially between the inner and outer edges so as to define at least a portion of the at least one tooth. Additionally, each lamination may define a nesting feature between the first and second side edges, wherein the nesting feature of each lamination is engaged against the nesting feature of an adjacent lamination when the stack of laminations is assembled together.Type: ApplicationFiled: October 25, 2011Publication date: April 25, 2013Applicant: GENERAL ELECTRIC COMPANYInventors: Bharat Bagepalli, Robert Michael Zirin, Randy Scott Longtin, Kiruba Sivasubramaniam Haran, Jan Erich Hemmelmann, Francesco Papini, Alexander Fiseni
-
Patent number: 8373307Abstract: A direct current (DC) power transmission system is described. The DC power transmission system includes a first plurality of series connected power collection systems and at least one superconducting DC conductor coupled to the plurality of series connected power collection systems and configured to transmit power generated by the plurality of power collection systems to a remote load.Type: GrantFiled: May 26, 2011Date of Patent: February 12, 2013Assignee: General Electric CompanyInventors: Christof Martin Sihler, Robert Roesner, Kiruba Sivasubramaniam Haran, Sumit Bose
-
Patent number: 8362863Abstract: 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: GrantFiled: January 14, 2011Date of Patent: January 29, 2013Assignee: General Electric CompanyInventors: James Humphrie Rochford, Kiruba Sivasubramaniam Haran, Ernst Wolfgang Stautner
-
Publication number: 20130002071Abstract: An inertial energy storage device includes a plurality of stationary electrical windings, a rotatable shaft, and a plurality of rotatable magnets coupled to the rotatable shaft. The plurality of stationary electrical windings extend about at least a portion of the plurality of rotatable magnets. The inertial energy storage device also includes a flywheel device that includes a substantially cylindrical hub rotatably coupled to the rotatable shaft. The flywheel device also includes a radially inner ring that includes a first material having a first density. The flywheel device further includes a radially outer ring that includes a second material having a second density. The first density is greater than the second density.Type: ApplicationFiled: June 28, 2011Publication date: January 3, 2013Inventors: Jeremy Daniel Van Dam, Mark Ernest Vermilyea, Kiruba Sivasubramaniam Haran
-
Patent number: 8346326Abstract: An electrical component comprises a superconductive wire, the wire comprising a first wire segment joined to a second wire segment, wherein the first wire segment and the second wire segment differ in at least one property selected from the group consisting of magnetic field tolerance, temperature tolerance, ac loss, and strain tolerance, and wherein the magnetic field tolerance is measured by the relationship of critical current Ic to magnetic field H at a given temperature T below critical temperature Tc, the temperature tolerance is measured by the relationship of critical current Ic to temperature T at a given magnetic field below critical magnetic field Hc, the ac loss is measured by the amount of ac loss versus the frequency and magnitude of applied ac currents and fields, and the strain tolerance is measured by critical current Ic degradation with strain.Type: GrantFiled: January 17, 2008Date of Patent: January 1, 2013Assignee: General Electric CompanyInventors: James William Bray, Evangelos Trifon Laskaris, Kiruba Sivasubramaniam
-
Patent number: 8332004Abstract: 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: GrantFiled: December 23, 2010Date of Patent: December 11, 2012Assignee: General Electric CompanyInventors: Ernst Wolfgang Stautner, Kiruba Sivasubramaniam Haran, James Rochford
-
Patent number: 8319389Abstract: 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: GrantFiled: August 30, 2010Date of Patent: November 27, 2012Assignee: General Electric CompanyInventors: Kiruba Sivasubramaniam Haran, James Pellegrino Alexander, Jay Zhiqiang Cao, Evangelos Trifon Laskaris, Murtuza Lokhandwalla, Jeremy Daniel Van Dam, Robert Michael Zirin
-
Patent number: 8314529Abstract: A technique for winding multi-turn, stranded wire coils using rectangular cables avoids the risk of damage associated with edge-wise bends.Type: GrantFiled: October 22, 2008Date of Patent: November 20, 2012Assignee: General Electric CompanyInventors: Kiruba Sivasubramaniam, Patrick Lee Jansen, Gary Randall Barnes, Jessica Mary Brower, Stephen Bertram Johnson
-
Patent number: 8274192Abstract: 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: GrantFiled: August 30, 2010Date of Patent: September 25, 2012Assignee: General Electric CompanyInventors: Murtuza Lokhandwalla, Kiruba Sivasubramaniam Haran, Robert Michael Zirin, Richard Nils Dawson, Mark John DeBlock, Randy Scott Longtin
-
Patent number: 8258906Abstract: 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: GrantFiled: August 12, 2009Date of Patent: September 4, 2012Assignee: General Electric CompanyInventors: Kiruba Sivasubramaniam, Patrick Lee Jansen, Ernst Wolfgang Stautner
-
Publication number: 20120214016Abstract: The present invention provides a method of making a flanged metal article. The method comprises (a) applying a first braze compound to a first portion of a metal article; (b) winding the first portion of a metal article with a length of a constraining metal member; and (c) heating an assembly of the metal article, the constraining metal member, and the first braze compound to a temperature above the solidus temperature of the first braze compound, typically a temperature in a range from about 300° C. to about 2500° C., to provide a flanged metal article, wherein the metal article has a coefficient of thermal expansion CTE 1, the constraining metal member has a coefficient of thermal expansion CTE 2, and CTE 1 is greater than CTE 2. The invention further provides a metal flange, which minimizes thermal expansion mismatch between a high expansion metal and a low expansion brittle material.Type: ApplicationFiled: February 22, 2011Publication date: August 23, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Jeremy Daniel Van Dam, Karen Kettler Denike, Kiruba Sivasubramaniam Haran, Don Mark Lipkin, Myles Standish Peterson, II
-
Patent number: 8212437Abstract: An electrical motor/generator is provided with at least one of a superconducting rotor, a stator including dovetailed winding dividers, and a stator cooling arrangement with at least one cooling tube per winding slot positioned such that each armature winding is thermally coupled to at least one cooling tube.Type: GrantFiled: March 9, 2005Date of Patent: July 3, 2012Assignee: General Electric CompanyInventors: Laskaris Trifon Evangelos, James Pelligrino Alexander, Kiruba Sivasubramaniam
-
Publication number: 20120133137Abstract: A wind turbine includes a gearbox coupled to a rotatable shaft for increasing speed of the rotation of the rotatable shaft, a doubly fed induction generator for generating electrical power from the rotations of the rotatable shaft comprising a stator and a rotor wherein the stator and the rotor comprise a plurality of stator slots and a plurality of rotor slots respectively and a tooth winding wound in at least one of the plurality of stator slots and the plurality of rotor slots wherein the tooth winding includes a fractional slot per pole per phase ratio, and a partial power converter electrically coupled to the doubly fed induction generator for controlling the electrical power for delivery to a power grid.Type: ApplicationFiled: December 14, 2011Publication date: May 31, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Boyanapally Srilatha, Munishwar Ahuja, Kiruba Sivasubramaniam Haran, Sunil Srinivasa Murthy
-
Publication number: 20120133145Abstract: The present disclosure relates to wind power generation systems having a segmented stator with a structural element and a plurality of coils. The wind power generation systems also include a rotor adapted to be rotated by wind to induce current in the plurality of coils and a lamination stack having a plurality of lamination plates disposed about the plurality of coils and a dovetail recess formed in the lamination stack. The wind power generation systems also include a dovetail bar adapted to be received by the dovetail recess and adjusted by a bolt to engage the lamination stack and the structural element of the segmented stator to form a torque transfer interface. Torque is adapted to be transferred from the lamination stack to the segmented stator via friction at the interface.Type: ApplicationFiled: November 29, 2011Publication date: May 31, 2012Applicant: General Electric CompanyInventors: Randy Scott Longtin, Robert Michael Zirin, Kiruba Sivasubramaniam Haran
-
Publication number: 20120025535Abstract: A direct current (DC) power transmission system is described. The DC power transmission system includes a first plurality of series connected power collection systems and at least one superconducting DC conductor coupled to the plurality of series connected power collection systems and configured to transmit power generated by the plurality of power collection systems to a remote load.Type: ApplicationFiled: May 26, 2011Publication date: February 2, 2012Inventors: Christof Martin Sihler, Robert Roesner, Kiruba Sivasubramaniam Haran, Sumit Bose