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).
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Patent number: 6775900Abstract: 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: GrantFiled: February 13, 2002Date of Patent: August 17, 2004Assignee: General Electric CompanyInventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Patent number: 6766572Abstract: 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: GrantFiled: January 17, 2002Date of Patent: July 27, 2004Assignee: General Electric CompanyInventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Patent number: 6597081Abstract: 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: GrantFiled: December 8, 2000Date of Patent: July 22, 2003Assignee: General Electric CompanyInventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Patent number: 6448686Abstract: 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: GrantFiled: December 8, 2000Date of Patent: September 10, 2002Assignee: General Electric CompanyInventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Publication number: 20020070628Abstract: 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: ApplicationFiled: January 17, 2002Publication date: June 13, 2002Applicant: General Electric CompanyInventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Publication number: 20020070629Abstract: 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: ApplicationFiled: December 8, 2000Publication date: June 13, 2002Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Publication number: 20020070631Abstract: 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: ApplicationFiled: February 13, 2002Publication date: June 13, 2002Applicant: General Electric CompanyInventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Publication number: 20020070630Abstract: 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: ApplicationFiled: December 8, 2000Publication date: June 13, 2002Inventors: Richard Nils Dawson, John A. Petti, Steven C. Walko, Robert J. Nygard
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Patent number: 6313561Abstract: 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: GrantFiled: January 26, 2000Date of Patent: November 6, 2001Assignee: General Electric CompanyInventors: Robert J. Nygard, Christopher A. Kaminski, Yu Wang