Patents by Inventor Craig L. Christenson
Craig L. Christenson 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: 7095131Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: GrantFiled: November 30, 2004Date of Patent: August 22, 2006Assignee: General Electric CompanyInventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Patent number: 6856039Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: GrantFiled: June 26, 2003Date of Patent: February 15, 2005Assignee: General Electric CompanyInventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Patent number: 6847128Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: GrantFiled: May 6, 2004Date of Patent: January 25, 2005Assignee: General Electric CompanyInventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Publication number: 20040207208Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: ApplicationFiled: May 6, 2004Publication date: October 21, 2004Inventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Publication number: 20040094964Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: ApplicationFiled: June 26, 2003Publication date: May 20, 2004Inventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Patent number: 6600240Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: GrantFiled: February 5, 2002Date of Patent: July 29, 2003Assignee: General Electric CompanyInventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Publication number: 20020105189Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: ApplicationFiled: February 5, 2002Publication date: August 8, 2002Inventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Patent number: 6420795Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: GrantFiled: August 16, 2000Date of Patent: July 16, 2002Assignee: Zond Energy Systems, Inc.Inventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Patent number: 6137187Abstract: A variable speed system for use in systems, such as, for example, wind turbines, is described. The system comprises a wound rotor induction generator, a torque controller and a proportional, integral derivative (PID) pitch controller. The torque controller controls generator torque using field oriented control, and the PID controller performs pitch regulation based on generator rotor speed.Type: GrantFiled: August 8, 1997Date of Patent: October 24, 2000Assignee: Zond Energy Systems, Inc.Inventors: Amir S. Mikhail, Craig L. Christenson, Kevin L. Cousineau, William L. Erdman, William E. Holley
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Patent number: 4901646Abstract: The invention concerns a fin-stabilized discarding sabot projectile for employment from a rifled barrel and is particularly suitable for automatic cannons having calibers from 12.7 to 70 millimeters. The full rate of spin commensurate with the rifling twist of a specific barrel and the muzzle velocity is imparted to the projectile during launch using a rotating band which is fixed and an integral component of the discarding sabot. The discarding sabot design involves the in-place injection molding of the sabot body, including a seal with obturator, onto the fin-stabilized projectile. The absence of slipping rotating band provides for a rugged sabot configuration which is particularly important for ammunition employed from automatic cannons. Launching at full rate of spin results in large centrifugal forces acting on the components of the sabot which provides for instantaneous and precise sabot separation upon projectile exit from the muzzle.Type: GrantFiled: March 27, 1989Date of Patent: February 20, 1990Assignee: Pacific Armatechnica CorporationInventors: Fritz K. Feldmann, Paul J. Griffith, Craig L. Christenson
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Patent number: 4815682Abstract: The invention concerns a fin-stabilized projectile for employment from a rifled barrel and is particularly suitable for automatic cannons having calibers from 12.7 to 70 millimeters. The full rate of spin commensurate with the rifling twist of a specific barrel and the muzzle velocity is imparted to the projectile during launch using a rotating band which is fixed and an integral component of the discarding sabot. Subsequent to exit from the muzzle of the gun the rate of spin of the projectile is decelerated rapidly by aerodynamic damping to avoid potential adverse effects due to Magnus moments. The aerodynamic design of the fins is such that the projectile spin reaches a steady state rate of spin which is at least 50 percent larger than the nutation frequency of the projectile. By means of this spin tuning resonance instability and roll lock-in are avoided over the operational range of the projectile.Type: GrantFiled: July 20, 1987Date of Patent: March 28, 1989Assignee: Pacific Armatechnica CorporationInventors: Fritz K. Feldmann, Paul J. Griffith, Craig L. Christenson