Patents by Inventor Harold S. Durham

Harold S. Durham 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: 7719154
    Abstract: A single field rotor motor comprising a rotor mounted for rotation with respect to a stator. The stator has a plurality of stator poles each having a coil for creating a magnetic pole force. The rotor has a plurality of circumferentially spaced salient rotor poles formed thereon, and has a first axial end and a second axial end. Magnetic means are provided for creating an unchanging, single polarity field on all of the rotor poles by inducing flux into the axial ends of the rotor. Circuit means for alternately charge said stator coils to alternate the polarity of a given stator pole to alternately attract and repel said rotor poles to produce rotation of said rotor.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: May 18, 2010
    Assignee: Tri-Seven Research, Inc.
    Inventors: Gary L. Durham, Harold S. Durham
  • Patent number: 7608967
    Abstract: A single field rotor motor comprising a rotor mounted for rotation with respect to a stator. The stator has a plurality of stator poles each having a coil for creating a magnetic pole force. The rotor has a plurality of circumferentially spaced salient rotor poles formed thereon, wherein the flux within the rotor maintains a constant polarity. Magnetic means are provided for creating a pair of magnetic flux fields, wherein interaction of the pair of magnetic flux fields causes the magnetic flux fields to spray radially outward with respect to the rotor, thereby creating uniform magnetic polarity on the rotor poles. Circuit means are provided for alternately charging said stator coils to alternate the polarity of a given stator pole to alternately attract and repel said rotor poles to produce rotation of said rotor.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: October 27, 2009
    Assignee: Tri-Seven Research, Inc.
    Inventors: Gary L. Durham, Harold S. Durham
  • Patent number: 7583000
    Abstract: A starting system and method for starting a salient-poled-rotor electric motor having a stator with a plurality of spaced salient poles, a plurality of field coils of unchanging polarity, and a plurality of armature coils, wherein each field coil of the plurality of field coils at least partially overlaps an armature coil of the plurality of armature coils, and wherein variable excitement of the armature coils alternately creates a magnetic pole force in every other pole of the plurality of spaced salient poles of the stator. In such motors, the stator has a first position, wherein the rotor is in stasis with respect to the stator and torque between the rotor and the stator is substantially minimized, and a second position, wherein torque between the rotor and the stator is substantially maximized. A drive circuit provides current to the field coils and the armature coils. A start circuit is provided for regulating the drive circuit to vibrate the rotor to the second position.
    Type: Grant
    Filed: August 8, 2006
    Date of Patent: September 1, 2009
    Assignee: Tri-Seven Research, Inc.
    Inventors: Gary L. Durham, Harold S. Durham
  • Publication number: 20090091205
    Abstract: A single field rotor motor comprising a rotor mounted for rotation with respect to a stator. The stator has a plurality of stator poles each having a coil for creating a magnetic pole force. The rotor has a plurality of circumferentially spaced salient rotor poles formed thereon, and has a first axial end and a second axial end. Magnetic means are provided for creating an unchanging, single polarity field on all of the rotor poles by inducing flux into the axial ends of the rotor. Circuit means for alternately charge said stator coils to alternate the polarity of a given stator pole to alternately attract and repel said rotor poles to produce rotation of said rotor.
    Type: Application
    Filed: December 18, 2008
    Publication date: April 9, 2009
    Inventors: Gary L. Durham, Harold S. Durham
  • Patent number: 7514832
    Abstract: An electric motor having a single field rotor wherein the flux within the rotor is generated by magnetic means located at the end regions of the motor housing such that the flux within the motor rotor maintains a constant polarity.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: April 7, 2009
    Assignee: Tri-Seven Research, Inc.
    Inventors: Gary L. Durham, Harold S. Durham
  • Publication number: 20070278887
    Abstract: A single field rotor motor comprising a rotor mounted for rotation with respect to a stator. The stator has a plurality of stator poles each having a coil for creating a magnetic pole force. The rotor has a plurality of circumferentially spaced salient rotor poles formed thereon, wherein the flux within the rotor maintains a constant polarity. Magnetic means are provided for creating a pair of magnetic flux fields, wherein interaction of the pair of magnetic flux fields causes the magnetic flux fields to spray radially outward with respect to the rotor, thereby creating uniform magnetic polarity on the rotor poles. Circuit means are provided for alternately charging said stator coils to alternate the polarity of a given stator pole to alternately attract and repel said rotor poles to produce rotation of said rotor.
    Type: Application
    Filed: May 30, 2006
    Publication date: December 6, 2007
    Inventors: Gary L. Durham, Harold S. Durham
  • Patent number: 6707208
    Abstract: An electric motor utilizing permanent magnets, wherein the permanent magnets produce a flux circuit in a first direction and shunt elements whereby the magnets and shunt elements rotate relative to each other wherein the shunt elements sequentially interrupt the magnet flux circuit to minimize generated flux circuits tending to rotate the motor in a direction opposite to the primary direction of motor rotation.
    Type: Grant
    Filed: May 12, 2003
    Date of Patent: March 16, 2004
    Inventors: Gary L. Durham, Harold S. Durham
  • Publication number: 20030230946
    Abstract: An electric motor utilizing permanent magnets, wherein the permanent magnets produce a flux circuit in a first direction and shunt elements whereby the magnets and shunt elements rotate relative to each other wherein the shunt elements sequentially interrupt the magnet flux circuit to minimize generated flux circuits tending to rotate the motor in a direction opposite to the primary direction of motor rotation.
    Type: Application
    Filed: May 12, 2003
    Publication date: December 18, 2003
    Inventors: Gary L. Durham, Harold S. Durham
  • Patent number: 6611078
    Abstract: The invention pertains to electrical machines of the electromagnetic type employing a stator and a rotatable rotor such as electric motors and generators wherein magnetic forces imposed upon the rotor produce rotor rotation. The invention utilizes permanent magnets in either the stator or rotor assembly to control the magnetic flux flow in one direction and encourage the flux in the opposite direction in certain areas of the stator and rotor assembly. Rotating flux conducting metal shunts are disposed adjacent permanent magnets creating magnetic flux to control the flux flow and pattern to most effectively use the flux forces on the rotor resulting in very high efficiencies in motor or generator operation.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: August 26, 2003
    Assignee: Tri-Seven Research, Inc.
    Inventors: Gary L. Durham, Harold S. Durham
  • Patent number: 4875428
    Abstract: A motorized outrigger drive for an outrigger on a fishing boat, the outrigger being of the kind having a boom fixedly cantilevered laterally outboard from the side of the boat for releasably trailing a fishing line from a point laterally spaced outboard from the side of the boat and thereby to minimize risk of tangling while simultaneously trolling with several fishing lines. An outrigger line loops around an outboard line direction changing means fixed adjacent the free end of the boom and a motorized drive unit fixed with respect to the boom and boat. The motorized drive unit reversibly feeds the outrigger line. A traveler unit is carried on the outrigger line and has a portion supporting a fishing line release.
    Type: Grant
    Filed: January 5, 1988
    Date of Patent: October 24, 1989
    Assignee: Armstrong International, Inc.
    Inventors: Ronald D. Schlesch, Merrill H. Armstrong, Stafford J. Vallery, Harold S. Durham