Patents by Inventor Robert J. Nygard

Robert J. Nygard 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: 6775900
    Abstract: A stator and a method of forming the stator comprises providing a stator frame having a frame plate, and connecting key bars to the frame plate at respective connection points, each of the key bars having a dovetail. The stator and method further includes providing a stator core comprising laminations each having a dovetail slot formed therein. Each dovetail is engaged into a respective dovetail slot so that at least some of the dovetails contact respective laminations at respective contact points. The locations of the contact points are controlled such that a force load transmitted by the contact points is evenly distributed among the contact points to thus minimize the maximum force transmitted. The location of the contact points is controlled such that a key bar stress at the connection points is also minimized.
    Type: Grant
    Filed: February 13, 2002
    Date of Patent: August 17, 2004
    Assignee: General Electric Company
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Patent number: 6766572
    Abstract: A stator comprises a stator frame, a plurality of key bars connected to the stator frame and a stator core. Each of the key bars has a dovetail. The stator core is formed by a pre-packaged stator core section including laminations each having a dovetail slot for engaging a respective dovetail. The stator core also includes a manually stacked stator core section including manually stacked laminations each having a dovetail slot for engaging respective dovetails. The cross-sectional area of the dovetail slots in the pre-packaged stator core section is larger than the cross-sectional area of the dovetail slots of the manually stacked stator core section.
    Type: Grant
    Filed: January 17, 2002
    Date of Patent: July 27, 2004
    Assignee: General Electric Company
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Patent number: 6597081
    Abstract: A stator and a method of forming the stator comprises providing a stator frame having a frame plate, and connecting key bars to the frame plate at respective connection points, each of the key bars having a dovetail. The stator and method further includes providing a stator core comprising laminations each having a dovetail slot formed therein. Each dovetail is engaged into a respective dovetail slot so that at least some of the dovetails contact respective laminations at respective contact points. The locations of the contact points are controlled such that a force load transmitted by the contact points is evenly distributed among the contact points to thus minimize the maximum force transmitted. The location of the contact points is controlled such that a key bar stress at the connection points is also minimized.
    Type: Grant
    Filed: December 8, 2000
    Date of Patent: July 22, 2003
    Assignee: General Electric Company
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Patent number: 6448686
    Abstract: A stator comprises a stator frame, a plurality of key bars connected to the stator frame and a stator core. Each of the key bars has a dovetail. The stator core is formed by a pre-packaged stator core section including laminations each having a dovetail slot for engaging a respective dovetail. The stator core also includes a manually stacked stator core section including manually stacked laminations each having a dovetail slot for engaging respective dovetails. The cross-sectional area of the dovetail slots in the pre-packaged stator core section is larger than the cross-sectional area of the dovetail slots of the manually stacked stator core section.
    Type: Grant
    Filed: December 8, 2000
    Date of Patent: September 10, 2002
    Assignee: General Electric Company
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Publication number: 20020070629
    Abstract: A stator comprises a stator frame, a plurality of key bars connected to the stator frame and a stator core. Each of the key bars has a dovetail. The stator core is formed by a pre-packaged stator core section including laminations each having a dovetail slot for engaging a respective dovetail. The stator core also includes a manually stacked stator core section including manually stacked laminations each having a dovetail slot for engaging respective dovetails. The cross-sectional area of the dovetail slots in the pre-packaged stator core section is larger than the cross-sectional area of the dovetail slots of the manually stacked stator core section.
    Type: Application
    Filed: December 8, 2000
    Publication date: June 13, 2002
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Publication number: 20020070631
    Abstract: A stator and a method of forming the stator comprises providing a stator frame having a frame plate, and connecting key bars to the frame plate at respective connection points, each of the key bars having a dovetail. The stator and method further includes providing a stator core comprising laminations each having a dovetail slot formed therein. Each dovetail is engaged into a respective dovetail slot so that at least some of the dovetails contact respective laminations at respective contact points. The locations of the contact points are controlled such that a force load transmitted by the contact points is evenly distributed among the contact points to thus minimize the maximum force transmitted. The location of the contact points is controlled such that a key bar stress at the connection points is also minimized.
    Type: Application
    Filed: February 13, 2002
    Publication date: June 13, 2002
    Applicant: General Electric Company
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Publication number: 20020070628
    Abstract: A stator comprises a stator frame, a plurality of key bars connected to the stator frame and a stator core. Each of the key bars has a dovetail. The stator core is formed by a pre-packaged stator core section including laminations each having a dovetail slot for engaging a respective dovetail. The stator core also includes a manually stacked stator core section including manually stacked laminations each having a dovetail slot for engaging respective dovetails. The cross-sectional area of the dovetail slots in the pre-packaged stator core section is larger than the cross-sectional area of the dovetail slots of the manually stacked stator core section.
    Type: Application
    Filed: January 17, 2002
    Publication date: June 13, 2002
    Applicant: General Electric Company
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Publication number: 20020070630
    Abstract: A stator and a method of forming the stator comprises providing a stator frame having a frame plate, and connecting key bars to the frame plate at respective connection points, each of the key bars having a dovetail. The stator and method further includes providing a stator core comprising laminations each having a dovetail slot formed therein. Each dovetail is engaged into a respective dovetail slot so that at least some of the dovetails contact respective laminations at respective contact points. The locations of the contact points are controlled such that a force load transmitted by the contact points is evenly distributed among the contact points to thus minimize the maximum force transmitted. The location of the contact points is controlled such that a key bar stress at the connection points is also minimized.
    Type: Application
    Filed: December 8, 2000
    Publication date: June 13, 2002
    Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
  • Patent number: 6313561
    Abstract: The conventional bar by bar assembly of a generator rotor can be replaced with a solid rotor having parallel slots milled into a rotor forging so that containment components can be replaced with a simplified enclosure. A dynamic blocking restraint assembly is beneficial to control winding position, to prevent load dissymmetries against the winding enclosure, and to provide sufficient preload to obtain predictable behavior in all expected modes of operation. The blocking assembly includes a sandwich construction of a first support block, at least one spring, additional wedge-shaped spacers in the case of multiple springs, and a second support block disposed in a symmetrical arrangement substantially aligned with the quadrature axis of the rotor. The assembly serves to provide circumferential restraint and to match the structural hoop stiffness of the winding enclosure. The construction of components can be configured to accommodate any desired degree of preloading.
    Type: Grant
    Filed: January 26, 2000
    Date of Patent: November 6, 2001
    Assignee: General Electric Company
    Inventors: Robert J. Nygard, Christopher A. Kaminski, Yu Wang