Patents by Inventor Richard E. Hartsfield

Richard E. Hartsfield 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: 7034423
    Abstract: An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.
    Type: Grant
    Filed: May 7, 2003
    Date of Patent: April 25, 2006
    Inventors: Alan D. Crapo, Todd A. Walls, Richard E. Hartsfield, Jr.
  • Patent number: 7009319
    Abstract: A method of determining magnet pole geometry for controlling cogging in an electric motor includes defining the magnet pole geometry in terms of at least one design parameter, predicting cogging as a function of the design parameter, and from the predicted cogging, selecting a value for the design parameter which corresponds to a desired level of cogging in the electric motor.
    Type: Grant
    Filed: June 21, 2004
    Date of Patent: March 7, 2006
    Assignee: Emerson Electric Co.
    Inventor: Richard E. Hartsfield, Jr.
  • Patent number: 6946766
    Abstract: An interior permanent magnet machine including a rotor stack defining at least two adjacent magnet retention slots and a plurality of permanent magnets positioned within the interior of the rotor, wherein the radial thickness of the rotor that is above a given magnet retention slot transitions from a first radial thickness to a bridge region having a second radial thickness that is less than the first radial thickness. The bridge region is positioned between the two magnet retention slots and the transition to the bridge region occurs within an area falling within a defined angular expanse.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: September 20, 2005
    Assignee: Emerson Electric Co.
    Inventors: Horst E. Gary, Richard E. Hartsfield, Jr., Mark E. Carrier
  • Patent number: 6941638
    Abstract: A method of connecting phases of a segmented stator electric machine includes providing a stator core. An end cap assembly is attached to the stator core. Winding wire is wound around the end cap assembly and the stator core to form a stator segment assembly. A plurality of the stator segment assemblies are assembled into a stator including first, second and third phases. A phase wire stitching machine is used to connect opposite ends of the winding wire of each of the stator segment assemblies to form the first, second and third phases of the stator. The phase wires can be attached to the stator segment assemblies using terminals, IDCs, hook terminals, and/or directly to the winding wire.
    Type: Grant
    Filed: July 11, 2002
    Date of Patent: September 13, 2005
    Assignee: Emerson Electric Co.
    Inventors: Richard E. Hartsfield, Jr., Gary E. Horst, Dennis M. Hurst, Kent A. Sheeran
  • Patent number: 6856055
    Abstract: An interconnecting ring and wire guide for an electric machine includes an annular radial ring having a radially inner edge and a radially outer edge. An axial ring projects axially from the radially inner edge of the annular radial ring. A guide positioner positions the annular radial ring and the axial ring relative to the electric machine. Wire dividers are located on a radially outer surface of the radial ring. The wire dividers include a plurality of circumferential projections that are formed on the radially outer surface of the radial ring. A plurality of wire guides are located adjacent to a radially outer edge of the annular radial ring. Indicia on an outer surface of the annular radial ring identifies at least one of a mounting position for the interconnecting ring and wire guide and a wiring schematic for phases wiring of the electric machine.
    Type: Grant
    Filed: July 11, 2002
    Date of Patent: February 15, 2005
    Assignee: Emerson Electric Co.
    Inventors: Paul G. Michaels, Kent A. Sheeran, Craig E. Wallace, Daniel E. Hilton, Richard E. Hartsfield, Jr.
  • Patent number: 6753632
    Abstract: A method of determining magnet pole geometry for controlling cogging in an electric motor includes defining the magnet pole geometry in terms of at least one design parameter, predicting cogging as a function of the design parameter, and from the predicted cogging, selecting a value for the design parameter which corresponds to desired level of cogging in the electric motor.
    Type: Grant
    Filed: January 7, 2003
    Date of Patent: June 22, 2004
    Assignee: Emerson Electric Co.
    Inventor: Richard E. Hartsfield, Jr.
  • Patent number: 6707209
    Abstract: A permanent magnet electric machine with reduced cogging torque includes a plurality of axial rotor sections that are defined on a radially outer surface of a rotor. The axial rotor sections include a set of permanent magnets that are in an unmagnetized state and that have opposite edges that are aligned with an axis of the rotor. The axial rotor sections are rotationally offset such that the edges of the permanent magnets create stair step interfaces. The n sets of permanent magnets are magnetized using a magnetizing fixture. The permanent magnets have a generally rectangular shape and are preferably arc magnets or breadloaf magnets. The conductors of the magnetizing fixture are aligned with the stair step interfaces. A magnetic field induced in the permanent magnets is substantially reduced along the stair step interfaces.
    Type: Grant
    Filed: May 9, 2001
    Date of Patent: March 16, 2004
    Assignee: Emerson Electric Co.
    Inventors: Alan D. Crapo, Todd A. Walls, Richard E. Hartsfield, Jr., Charles P. Ketterer, Ken De Luca
  • Publication number: 20040041483
    Abstract: An interior permanent magnet machine including a rotor stack defining at least two adjacent magnet retention slots and a plurality of permanent magnets positioned within the interior of the rotor, wherein the radial thickness of the rotor that is above a given magnet retention slot transitions from a first radial thickness to a bridge region having a second radial thickness that is less than the first radial thickness. The bridge region is positioned between the two magnet retention slots and the transition to the bridge region occurs within an area falling within a defined angular expanse.
    Type: Application
    Filed: August 28, 2002
    Publication date: March 4, 2004
    Inventors: Horst E. Gary, Richard E. Hartsfield, Mark E. Carrier
  • Publication number: 20040007934
    Abstract: An interconnecting ring and wire guide for an electric machine includes an annular radial ring having a radially inner edge and a radially outer edge. An axial ring projects axially from the radially inner edge of the annular radial ring. A guide positioner positions the annular radial ring and the axial ring relative to the electric machine. Wire dividers are located on a radially outer surface of the radial ring. The wire dividers include a plurality of circumferential projections that are formed on the radially outer surface of the radial ring. A plurality of wire guides are located adjacent to a radially outer edge of the annular radial ring. Indicia on an outer surface of the annular radial ring identifies at least one of a mounting position for the interconnecting ring and wire guide and a wiring schematic for phases wiring of the electric machine.
    Type: Application
    Filed: July 11, 2002
    Publication date: January 15, 2004
    Applicant: Emerson Electric Co.
    Inventors: Paul G. Michaels, Kent A. Sheeran, Craig E. Wallace, Daniel E. Hilton, Richard E. Hartsfield
  • Publication number: 20040006865
    Abstract: A method of connecting phases of a segmented stator electric machine includes providing a stator core. An end cap assembly is attached to the stator core. Winding wire is wound around the end cap assembly and the stator core to form a stator segment assembly. A plurality of the stator segment assemblies are assembled into a stator including first, second and third phases. A phase wire stitching machine is used to connect opposite ends of the winding wire of each of the stator segment assemblies to form the first, second and third phases of the stator. The phase wires can be attached to the stator segment assemblies using terminals, IDCs, hook terminals, and/or directly to the winding wire.
    Type: Application
    Filed: July 11, 2002
    Publication date: January 15, 2004
    Applicant: Emerson Electric Co.
    Inventors: Richard E. Hartsfield, Gary E. Horst, Dennis M. Hurst, Kent A. Sheeran
  • Publication number: 20030201137
    Abstract: An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.
    Type: Application
    Filed: May 7, 2003
    Publication date: October 30, 2003
    Inventors: Alan D. Crapo, Todd A. Walls, Richard E. Hartsfield
  • Patent number: 6597078
    Abstract: An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: July 22, 2003
    Assignee: Emerson Electric Co.
    Inventors: Alan D. Crapo, Todd A. Walls, Richard E. Hartsfield, Jr.
  • Publication number: 20020101126
    Abstract: An electric power steering system for a vehicle includes a steering wheel and a steering shaft that is connected to the steering wheel. A worm gear is connected to the steering shaft. A worm is threadably engaged to the worm gear. A permanent magnet motor is connected to the worm. The permanent magnet motor includes a stator with twelve slots and a rotor with ten poles. The rotor includes one or more axial rotor sections. If more than one axial rotor section is employed, the axial rotor sections are rotationally offset. The axial rotor sections are rotationally offset by an offset angle that is equal to a cogging angle divided by the number of axial rotor sections. The rotor includes breadloaf, spoke, radial or arc permanent magnets.
    Type: Application
    Filed: January 30, 2001
    Publication date: August 1, 2002
    Inventors: Alan D. Crapo, Todd A. Walls, Richard E. Hartsfield
  • Publication number: 20020093269
    Abstract: A stator for an electric machine such as a motor or a generator includes a plurality of stator segment assemblies. The stator segment assembly includes a stack of stator plates forming a stator segment core. The stator plates include an outer rim section and a tooth section that extends radially inwardly from a center portion of the outer rim section. A radially inner surface of the outer rim section is generally perpendicular to the tooth section. Undercut portions are formed in the radially inner surface of the outer rim section adjacent to the center portion. The undercut portions increase slot area and allow additional winding wire to be wound around the stack. The additional winding wire increases the current carrying capacity of the electric machine through reduced resistance or increased torque per unit volume.
    Type: Application
    Filed: January 16, 2001
    Publication date: July 18, 2002
    Inventors: Bernard G. Harter, Richard E. Hartsfield, James A. Wafer
  • Publication number: 20020067092
    Abstract: A permanent magnet electric machine with reduced cogging torque includes a plurality of axial rotor sections that are defined on a radially outer surface of a rotor. The axial rotor sections include a set of permanent magnets that are in an unmagnetized state and that have opposite edges that are aligned with an axis of the rotor. The axial rotor sections are rotationally offset such that the edges of the permanent magnets create stair step interfaces. The n sets of permanent magnets are magnetized using a magnetizing fixture. The permanent magnets have a generally rectangular shape and are preferably arc magnets or breadloaf magnets. The conductors of the magnetizing fixture are aligned with the stair step interfaces. A magnetic field induced in the permanent magnets is substantially reduced along the stair step interfaces.
    Type: Application
    Filed: May 9, 2001
    Publication date: June 6, 2002
    Inventors: Alan D. Crapo, Todd A. Walls, Richard E. Hartsfield, Charles P. Ketterer, Ken De Luca
  • Patent number: 6359355
    Abstract: The construction of an electromagnetic device, such as an electric motor, has a segmented stator with a plurality of stator teeth held in a circular pattern solely by a shell of the motor that has been hot dropped over the stator teeth.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: March 19, 2002
    Assignee: Emerson Electric Co.
    Inventors: Richard E. Hartsfield, Michael E. Moore
  • Patent number: D527739
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: September 5, 2006
    Assignees: Emerson Electric Co., Dana Emerson Actuator Systems, LLP
    Inventors: Kenneth M. De Luca, Mark S. East, John P. Foulsham, Richard E. Hartsfield, Jr., Charles P. Ketterer, Jemmi C. McDonald