Patents by Inventor Roy D. Rasmussen
Roy D. Rasmussen 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: 9455604Abstract: A wound-field synchronous machine includes a stator and a rotor. Around the rotor is a rotor sleeve including a damper bar assembly forming an amortisseur circuit.Type: GrantFiled: October 16, 2012Date of Patent: September 27, 2016Assignee: Hamilton Sundstrand CorporationInventors: Roy D. Rasmussen, William Louis Wentland, John F. Bangura
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Patent number: 9030074Abstract: A wedge for use in a generator rotor has a wedge body with a central radially top surface of the wedge body, formed with a plurality of blades. At least some of the plurality of blades extend at an angle such that a plane defined through the blades will be non-perpendicular to a rotational axis of the rotor that will receive the wedge.Type: GrantFiled: May 4, 2012Date of Patent: May 12, 2015Assignee: Hamilton Sundstrand CorporationInventors: Joseph Kenneth Coldwate, Roy D. Rasmussen
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Patent number: 8917003Abstract: A permanent magnet rotor for use on an electrical generator comprises a hub having an outer peripheral surface and an inner peripheral bore centered on an axis. The inner peripheral bore is provided with a screw thread at least over a portion of an axial dimension. Permanent magnets are mounted on the outer peripheral surface of the hub. A containment band is positioned radially outwardly of the magnets, holding the magnets and the hub together. The hub, a generator rotor incorporating the permanent magnet rotor, and a generator incorporating the permanent magnet rotor are also disclosed and claimed in this application.Type: GrantFiled: May 6, 2009Date of Patent: December 23, 2014Assignee: Hamilton Sundstrand CorporationInventors: Roy D. Rasmussen, Scott R. Ganong, Glenn C. Lemmers, Jr.
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Patent number: 8878409Abstract: A rotor has a rotor body for rotation about a shaft. A plurality of permanent magnets are spaced circumferentially about the rotor body. A containment band is positioned radially outwardly of the permanent magnets. The containment band has a containment band coefficient of thermal expansion. The permanent magnets have a permanent magnet coefficient of thermal expansion, taken parallel to a magnetic alignment. A ratio of the containment band coefficient of thermal expansion to the permanent magnet coefficient of thermal expansion is less than or equal to 1.15.Type: GrantFiled: September 13, 2012Date of Patent: November 4, 2014Assignee: Hamilton Sundstrand Space Systems International, Inc.Inventors: Craig R. Legros, Roy D. Rasmussen
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Patent number: 8769804Abstract: A method of assembling an electric motor is provided. The method includes positioning a guide rod within a motor housing and along an axial direction of the motor housing, wherein the guide rod is disposed radially inward of a plurality of motor components. Also included is guiding a rotor along the guide rod and radially inward of the plurality of motor components.Type: GrantFiled: February 15, 2012Date of Patent: July 8, 2014Assignee: Hamilton Sundstrand CorporationInventors: Roy D. Rasmussen, Aaron M. Finke, Nathan D. Lewis
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Publication number: 20140103774Abstract: A wound-field synchronous machine includes a stator and a rotor. Around the rotor is a rotor sleeve including a damper bar assembly forming an amortisseur circuit.Type: ApplicationFiled: October 16, 2012Publication date: April 17, 2014Applicant: HAMILTON SUNDSTRAND CORPORATIONInventors: Roy D. Rasmussen, William Louis Wentland, John F. Bangura
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Publication number: 20140070634Abstract: A rotor has a rotor body for rotation about a shaft. A plurality of permanent magnets are spaced circumferentially about the rotor body. A containment band is positioned radially outwardly of the permanent magnets. The containment band has a containment band coefficient of thermal expansion. The permanent magnets have a permanent magnet coefficient of thermal expansion, taken parallel to a magnetic alignment. A ratio of the containment band coefficient of thermal expansion to the permanent magnet coefficient of thermal expansion is less than or equal to 1.15.Type: ApplicationFiled: September 13, 2012Publication date: March 13, 2014Inventors: Craig R. Legros, Roy D. Rasmussen
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Publication number: 20140001901Abstract: An electric motor has a primary and a secondary seal isolating a rotor cavity from a stator cavity.Type: ApplicationFiled: June 28, 2012Publication date: January 2, 2014Inventors: Adam M. Finney, Roy D. Rasmussen, Aaron M. Finke
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Publication number: 20130293055Abstract: A wedge for use in a generator rotor has a wedge body with a central radially top surface of the wedge body, formed with a plurality of blades. At least some of the plurality of blades extend at an angle such that a plane defined through the blades will be non-perpendicular to a rotational axis of the rotor that will receive the wedge.Type: ApplicationFiled: May 4, 2012Publication date: November 7, 2013Inventors: Joseph Kenneth Coldwate, Roy D. Rasmussen
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Publication number: 20130205581Abstract: A method of assembling an electric motor is provided. The method includes positioning a guide rod within a motor housing and along an axial direction of the motor housing, wherein the guide rod is disposed radially inward of a plurality of motor components. Also included is guiding a rotor along the guide rod and radially inward of the plurality of motor components.Type: ApplicationFiled: February 15, 2012Publication date: August 15, 2013Applicant: HAMILTON SUNDSTRAND CORPORATIONInventors: Roy D. Rasmussen, Aaron M. Finke, Nathan D. Lewis
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Publication number: 20130193781Abstract: An insulated electric motor includes a stator core having a stator cavity. Also included is an adhering material disposed within at least one portion of the stator cavity. Further included is a filling substance disposed within the at least one portion of the stator cavity and adhered to the adhering material, wherein the adhering material and the filling substance substantially fill the stator cavity.Type: ApplicationFiled: February 1, 2012Publication date: August 1, 2013Applicant: HAMILTON SUNDSTRAND CORPORATIONInventors: Roy D. Rasmussen, Aaron M. Finke
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Patent number: 8138642Abstract: A rotor for a dynamoelectric machine may include a rotor shaft having a first shaft and a second shaft within the first shaft. The two shafts include discharge orifices for communicating a cooling fluid through the machine. A rotor core of the machine includes a lamination having an annular portion that circumscribes an open center, a plurality of pole portions extending outwardly from the annular portion, and coil winding regions adjacent to the pole portions. One or more channels extend between the open center and the coil winding regions to communicate a cooling fluid. Coil windings of the machine may be at least partially encased in insulators. Each insulator may include a fluid entry orifice located between the insulator ends to communicate a cooling fluid. An end plate of the machine may include fluid discharge outlets for communicating cooling fluid received from the coil windings.Type: GrantFiled: June 17, 2009Date of Patent: March 20, 2012Assignee: Hamilton Sundstrand CorporationInventors: Glenn C. Lemmers, Jr., Scott R. Ganong, Roy D. Rasmussen, Debabrata Pal
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Patent number: 8053938Abstract: A core assembly for an electric motor includes a heat exchanger comprising a plurality of fins. The fins define a plurality of cooling air passages that include offset fins that disrupt cooling air flow to reduce the formation of boundary layers and improve heat transfer capacity.Type: GrantFiled: November 9, 2007Date of Patent: November 8, 2011Assignee: Hamilton Sundstand CorporationInventors: Debabrata Pal, Mark Hamilton Severson, Roy D. Rasmussen
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Patent number: 8018114Abstract: A wedge for use in a generator rotor includes a wedge body having a generally triangular shape with flat surfaces, and such that when the wedge is placed in a generator rotor, the flat surfaces will define circumferential extents of the wedge body relative to a rotational axis of the rotor, and said flat surfaces extending to a radially outermost extent of the wedge body. A wedge and winding combination, a generator rotor, a generator and a method all using the wedges are disclosed and claimed.Type: GrantFiled: March 26, 2009Date of Patent: September 13, 2011Assignee: Hamilton Sundstrand CorporationInventors: Roy D. Rasmussen, Scott R. Ganong, Glenn C. Lemmers, Jr.
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Publication number: 20100320850Abstract: A rotor for a dynamoelectric machine may include a rotor shaft having a first shaft and a second shaft within the first shaft. The two shafts include discharge orifices for communicating a cooling fluid through the machine. A rotor core of the machine includes a lamination having an annular portion that circumscribes an open center, a plurality of pole portions extending outwardly from the annular portion, and coil winding regions adjacent to the pole portions. One or more channels extend between the open center and the coil winding regions to communicate a cooling fluid. Coil windings of the machine may be at least partially encased in insulators. Each insulator may include a fluid entry orifice located between the insulator ends to communicate a cooling fluid. An end plate of the machine may include fluid discharge outlets for communicating cooling fluid received from the coil windings.Type: ApplicationFiled: June 17, 2009Publication date: December 23, 2010Inventors: Glenn C. Lemmers, JR., Scott R. Ganong, Roy D. Rasmussen, Debabrata Pal
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Publication number: 20100283346Abstract: A permanent magnet rotor for use on an electrical generator comprises a hub having an outer peripheral surface and an inner peripheral bore centered on an axis. The inner peripheral bore is provided with a screw thread at least over a portion of an axial dimension. Permanent magnets are mounted on the outer peripheral surface of the hub. A containment band is positioned radially outwardly of the magnets, holding the magnets and the hub together. The hub, a generator rotor incorporating the permanent magnet rotor, and a generator incorporating the permanent magnet rotor are also disclosed and claimed in this application.Type: ApplicationFiled: May 6, 2009Publication date: November 11, 2010Inventors: Roy D. Rasmussen, Scott R. Ganong, Glenn C. Lemmers, JR.
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Publication number: 20100244614Abstract: A wedge for use in a generator rotor includes a wedge body having a generally triangular shape with flat surfaces, and such that when the wedge is placed in a generator rotor, the flat surfaces will define circumferential extents of the wedge body relative to a rotational axis of the rotor, and said flat surfaces extending to a radially outermost extent of the wedge body. A wedge and winding combination, a generator rotor, a generator and a method all using the wedges are disclosed and claimed.Type: ApplicationFiled: March 26, 2009Publication date: September 30, 2010Inventors: Roy D. Rasmussen, Scott R. Ganong, Glenn C. Lemmers, JR.
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Publication number: 20090160281Abstract: A rotor assembly includes several permanent magnets separated by spacers. The permanent magnets and the spacers are all fabricated from material having the same coefficient of thermal expansion. The spacers are in a non-magnetized state and provide support for a sleeve placed in a high interference fit with the permanent magnets. The sleeve is thereby fully supported about the inner circumference such that uneven bending stresses are significantly reduced to provide a desired operational life.Type: ApplicationFiled: December 20, 2007Publication date: June 25, 2009Inventors: Roy D. Rasmussen, Craig R. Legros
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Publication number: 20090121564Abstract: A core assembly for an electric motor includes a heat exchanger comprising a plurality of fins. The fins define a plurality of cooling air passages that include offset fins that disrupt cooling air flow to reduce the formation of boundary layers and improve heat transfer capacity.Type: ApplicationFiled: November 9, 2007Publication date: May 14, 2009Inventors: Debabrata Pal, Mark Hamilton Severson, Roy D. Rasmussen
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Patent number: 5323080Abstract: A two-pole generator rotor assembly including a one-piece shaft, a prewound field coil assembly and a one-piece shaft. The one piece shaft includes a pair of axially spaced shaft end portions and a substantially cylindrical portion integrally formed with the spaced shaft end portions and interposed therebetween. The substantially cylindrical central portion includes a through slot for accommodating the prewound field coil assembly, with the through slot including a pair of opposed wall portions adapted to engage an outer peripheral portion of the prewound field coil assembly and provide means for retention of the prewound field coil.Type: GrantFiled: May 7, 1993Date of Patent: June 21, 1994Assignee: Sundstrand CorporationInventors: Mohammad Shahamat, Walter Iseman, Tyrone A. Johnsen, Roy D. Rasmussen