Patents by Inventor David F. Nelson
David F. Nelson 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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Publication number: 20240102783Abstract: A tool, such as a tape measure, including a spring-based retraction system is shown. Various spring-based retraction system embodiments are configured to decrease the size occupied by the spring within the tape measure housing, which consequently reduces tape measure housing size providing a more compact tape measure. Various spring-based retraction system embodiments are configured to control retraction of the tape measure in a manner that reduces whip or otherwise controls tape blade retraction. Some retraction system embodiments utilize a reduction gear train, and others utilize a compression spring and a transmission system that converts rotational movement of the tape reel to axial movement, which compresses the spring.Type: ApplicationFiled: December 5, 2023Publication date: March 28, 2024Inventors: Collin J. Nelson, David Andrew Wortelboer, Kyle C. Anderson, Abhijeet A. Khangar, Jonathan F. Vitas
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Patent number: 11381130Abstract: An electric motor includes: a housing having a first rotor bearing and a stator support surface; a cantilever stator that includes a lamination stack, a first side of the lamination stack abutting the stator support surface and a second side of the lamination stack abutting a stator endbell that has a second rotor bearing, wherein the cantilever stator is held by way of tie rods attaching the stator endbell to the housing; and a rotor in the cantilever stator, the rotor held by the first and second rotor bearings.Type: GrantFiled: November 4, 2019Date of Patent: July 5, 2022Assignee: Tesla, Inc.Inventors: Edwin M. Pearce, Jr., Jim Robbins, Scott Heines, David F. Nelson, Gary A. Pinkley, Michael Balsamo, Augusto E. Barton
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Patent number: 11271510Abstract: An electric motor includes a configuration that directs at least a portion of an electric field generated by phase windings into a stator.Type: GrantFiled: November 25, 2019Date of Patent: March 8, 2022Assignee: Apple Inc.Inventors: Li Niu, Dillon J. Thomasson, Kan Zhou, David F. Nelson, Rui Guan
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Patent number: 10938280Abstract: An electric motor includes: a stator; a shaft; a rotor mounted on the shaft, the rotor having an end ring that is concentric with the shaft; and a flux shield around the shaft inside the end ring.Type: GrantFiled: November 1, 2013Date of Patent: March 2, 2021Assignee: Tesla, Inc.Inventors: Konstantinos Laskaris, Andrew D. Baglino, Chad Furey, David F. Nelson
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Publication number: 20200244136Abstract: An electric motor includes: a housing having a first rotor bearing and a stator support surface; a cantilever stator that includes a lamination stack, a first side of the lamination stack abutting the stator support surface and a second side of the lamination stack abutting a stator endbell that has a second rotor bearing, wherein the cantilever stator is held by way of tie rods attaching the stator endbell to the housing; and a rotor in the cantilever stator, the rotor held by the first and second rotor bearingsType: ApplicationFiled: November 4, 2019Publication date: July 30, 2020Inventors: Edwin M. Pearce, JR., Jim Robbins, Scott Heines, David F. Nelson, Gary A. Pinkley, Michael Balsamo, Augusto E. Barton
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Patent number: 10498280Abstract: An electric motor includes a configuration that directs at least a portion of an electric field generated by phase windings into a stator.Type: GrantFiled: August 22, 2017Date of Patent: December 3, 2019Assignee: Apple Inc.Inventors: Li Niu, Dillon J. Thomasson, Kan Zhou, David F. Nelson, Rui Guan
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Patent number: 10468937Abstract: An electric motor includes: a housing having a first rotor bearing and a stator support surface; a cantilever stator that includes a lamination stack, a first side of the lamination stack abutting the stator support surface and a second side of the lamination stack abutting a stator endbell that has a second rotor bearing, wherein the cantilever stator is held by way of tie rods attaching the stator endbell to the housing; and a rotor in the cantilever stator, the rotor held by the first and second rotor bearings.Type: GrantFiled: December 1, 2014Date of Patent: November 5, 2019Assignee: TESLA, INC.Inventors: Edwin M. Pearce, Jr., Jim Robbins, Scott Heines, David F. Nelson, Gary A. Pinkley, Michael Balsamo, Augusto E. Barton
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Patent number: 10439477Abstract: A liquid cooling system for an electric motor includes: a pump for liquid to cool the electric motor; a heat exchanger that removes heat from the liquid; a manifold extending above a stator of the electric motor, the manifold receiving the liquid under pressure and having a first opening that directs a first liquid jet onto the stator; and a first tray above first end turns of the stator, the manifold having a second opening that directs a second liquid jet onto the first tray, the first tray having a third opening that performs gravity-fed liquid distribution onto the first end turns.Type: GrantFiled: January 31, 2014Date of Patent: October 8, 2019Assignee: Tesla, Inc.Inventors: Gary A. Pinkley, David F. Nelson, William R. Fong, Scott Heines, Edwin M. Pearce, Jr.
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Publication number: 20160156245Abstract: An electric motor includes: a housing having a first rotor bearing and a stator support surface; a cantilever stator that includes a lamination stack, a first side of the lamination stack abutting the stator support surface and a second side of the lamination stack abutting a stator endbell that has a second rotor bearing, wherein the cantilever stator is held by way of tie rods attaching the stator endbell to the housing; and a rotor in the cantilever stator, the rotor held by the first and second rotor bearings.Type: ApplicationFiled: December 1, 2014Publication date: June 2, 2016Inventors: Edwin M. PEARCE, JR., Jim Robbins, Scott Heines, David F. Nelson, Gary A. Pinkley, Michael Balsamo, Augusto E. Barton
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Publication number: 20150222162Abstract: A liquid cooling system for an electric motor includes: a pump for liquid to cool the electric motor; a heat exchanger that removes heat from the liquid; a manifold extending above a stator of the electric motor, the manifold receiving the liquid under pressure and having a first opening that directs a first liquid jet onto the stator; and a first tray above first end turns of the stator, the manifold having a second opening that directs a second liquid jet onto the first tray, the first tray having a third opening that performs gravity-fed liquid distribution onto the first end turns.Type: ApplicationFiled: January 31, 2014Publication date: August 6, 2015Applicant: Tesla Motors, Inc.Inventors: Gary A. Pinkley, David F. Nelson, William R. Fong, Scott Heines, Edwin M. Pearce, JR.
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Publication number: 20150123511Abstract: An electric motor includes: a stator; a shaft; a rotor mounted on the shaft, the rotor having an end ring that is concentric with the shaft; and a flux shield around the shaft inside the end ring.Type: ApplicationFiled: November 1, 2013Publication date: May 7, 2015Applicant: Tesla Motors, Inc.Inventors: Konstantinos Laskaris, Andrew D. Baglino, Chad Furey, David F. Nelson
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Patent number: 8462529Abstract: A power converter assembly is provided. The power converter assembly includes first, second, and third power modules. The second power module is coupled to the first power module such that the second power module is separated from the first power module by a first distance. The third power module is coupled to the first and second power modules such that the third power module is separated from the second power module by a second distance and is separated from the first power module by a third distance. The first, second, and third distances are substantially the same.Type: GrantFiled: July 24, 2008Date of Patent: June 11, 2013Assignee: GM Global Technology Operations LLCInventors: Terence G. Ward, Gregory S. Smith, George John, David F. Nelson
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Patent number: 8400775Abstract: A subcomponent is provided for a power inverter module. The apparatus comprises a capacitor having a terminal and integrated into a housing. A substrate is mounted on the housing. The substrate incorporates a power semiconductor switch and has at least one direct current (DC) tab. The direct current tab is directly connected to the terminal of the capacitor.Type: GrantFiled: July 6, 2007Date of Patent: March 19, 2013Assignee: GM Global Technology Operations LLCInventors: Terence G. Ward, George John, Edward P. Yankoski, David F. Nelson, Gregory S. Smith, James M. Nagashima
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Patent number: 8139371Abstract: A power switch apparatus includes a substrate; a semiconductor die mounted on the substrate and including power electronics circuitry for a high power, alternating current motor application; gate drive circuitry mounted on the substrate and electrically coupled to the power electronics circuitry on the semiconductor die; and control circuitry mounted on the substrate and electrically coupled to the gate drive circuitry.Type: GrantFiled: July 23, 2008Date of Patent: March 20, 2012Assignee: GM Global Technology Operations LLCInventors: David F. Nelson, George John, Gregory S. Smith, David Tang, James M. Nagashima, Gabriel Gallegos-Lopez
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Patent number: 7973433Abstract: A power switch apparatus includes a substrate; a semiconductor die mounted on the substrate and including power electronics circuitry for a high power, alternating current motor application; and gate drive circuitry mounted on the substrate and electrically coupled to the power electronics circuitry on the semiconductor die.Type: GrantFiled: July 24, 2008Date of Patent: July 5, 2011Inventors: David F. Nelson, George John, Gregory S. Smith, David Tang, James M. Nagashima, Gabriel Gallegos-Lopez
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Patent number: 7911161Abstract: An automotive power inverter is provided. The power inverter includes a chassis, a microelectronic die coupled to the chassis and having an integrated circuit formed thereon, and an insulating region between the chassis and the microelectronic die.Type: GrantFiled: June 28, 2007Date of Patent: March 22, 2011Assignee: GM Global Technology Operations LLCInventors: Terence G. Ward, Gregory Scott Smith, George John, Tilak Gopalarathnam, David F. Nelson
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Patent number: 7884468Abstract: A cooling device is provided for liquid cooling a power semiconductor device. The device includes a coolant diverter for guiding liquid coolant to the power semiconductor device. The coolant diverter has a first plate for dividing the coolant diverter into a first cavity and a second cavity. The second cavity positioned adjacent the power semiconductor device. The first plate further includes an opening to fluidly couple the first cavity with the second cavity such that the liquid coolant flows into the first cavity, through the opening in the first plate, and into the second cavity to cool the power semiconductor device. The first cavity has a cross-sectional area that generally decreases in a downstream direction, and the second cavity has a cross-sectional area that generally increases in the downstream direction.Type: GrantFiled: July 23, 2008Date of Patent: February 8, 2011Assignee: GM Global Technology Operations LLCInventors: Brooks S Mann, George R. Woody, Terence G. Ward, David F. Nelson
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Patent number: 7723874Abstract: Cooling systems and methods are provided for an integrated electric motor-inverter, where the integrated electric motor-inverter includes a housing, a motor, and an inverter, the motor and the inverter are disposed within the housing, and the motor includes a stator. The system includes a cooling jacket, a first coolant, a condenser, a spray head, and a second coolant. The cooling jacket is disposed concentric to the stator and includes an inner wall and an outer wall. The inner wall is in direct contact with the stator. The first coolant is disposed between the cooling jacket inner and outer walls. The condenser is disposed concentric to the cooling jacket. The spray head is disposed adjacent the inverter. The second coolant is in flow communication with the spray head.Type: GrantFiled: February 15, 2008Date of Patent: May 25, 2010Assignee: GM Global Technology Operations, Inc.Inventors: George R. Woody, Karl D. Conroy, James M. Nagashima, David F. Nelson, Eric R. Ostrom, Gregory S. Smith
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Patent number: 7580261Abstract: A cooling system is provided for use in conjunction with a semiconductor assembly including a first semiconductor device and a second semiconductor device electrically coupled to the first semiconductor device by an elongated electrical connection. The cooling system includes a flow passage, a pump fluidly coupled to the flow passage, and an outlet array fluidly coupled to the flow passage and configured to direct a coolant fluid over the second semiconductor device. The outlet array has an interconnect feature formed therein configured to receive the elongated electrical connection there through.Type: GrantFiled: March 13, 2007Date of Patent: August 25, 2009Assignee: GM Global Technology Operations, Inc.Inventors: Gregory Scott Smith, George John, Terence G. Ward, Edward P Yankoski, David F. Nelson
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Publication number: 20090206687Abstract: Cooling systems and methods are provided for an integrated electric motor-inverter, where the integrated electric motor-inverter includes a housing, a motor, and an inverter, the motor and the inverter are disposed within the housing, and the motor includes a stator. The system includes a cooling jacket, a first coolant, a condenser, a spray head, and a second coolant. The cooling jacket is disposed concentric to the stator and includes an inner wall and an outer wall. The inner wall is in direct contact with the stator. The first coolant is disposed between the cooling jacket inner and outer walls. The condenser is disposed concentric to the cooling jacket. The spray head is disposed adjacent the inverter. The second coolant is in flow communication with the spray head.Type: ApplicationFiled: February 15, 2008Publication date: August 20, 2009Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: George R. WOODY, Karl D. CONROY, James M. NAGASHIMA, David F. NELSON, Eric R. OSTROM, Gregory S. SMITH