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: 7719154Abstract: 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: GrantFiled: December 18, 2008Date of Patent: May 18, 2010Assignee: Tri-Seven Research, Inc.Inventors: Gary L. Durham, Harold S. Durham
-
Patent number: 7608967Abstract: 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: GrantFiled: May 30, 2006Date of Patent: October 27, 2009Assignee: Tri-Seven Research, Inc.Inventors: Gary L. Durham, Harold S. Durham
-
Patent number: 7583000Abstract: 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: GrantFiled: August 8, 2006Date of Patent: September 1, 2009Assignee: Tri-Seven Research, Inc.Inventors: Gary L. Durham, Harold S. Durham
-
Publication number: 20090091205Abstract: 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: ApplicationFiled: December 18, 2008Publication date: April 9, 2009Inventors: Gary L. Durham, Harold S. Durham
-
Patent number: 7514832Abstract: 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: GrantFiled: February 17, 2004Date of Patent: April 7, 2009Assignee: Tri-Seven Research, Inc.Inventors: Gary L. Durham, Harold S. Durham
-
Publication number: 20070278887Abstract: 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: ApplicationFiled: May 30, 2006Publication date: December 6, 2007Inventors: Gary L. Durham, Harold S. Durham
-
Patent number: 6707208Abstract: 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: GrantFiled: May 12, 2003Date of Patent: March 16, 2004Inventors: Gary L. Durham, Harold S. Durham
-
Publication number: 20030230946Abstract: 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: ApplicationFiled: May 12, 2003Publication date: December 18, 2003Inventors: Gary L. Durham, Harold S. Durham
-
Patent number: 6611078Abstract: 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: GrantFiled: July 19, 2000Date of Patent: August 26, 2003Assignee: Tri-Seven Research, Inc.Inventors: Gary L. Durham, Harold S. Durham
-
Patent number: 4875428Abstract: 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: GrantFiled: January 5, 1988Date of Patent: October 24, 1989Assignee: Armstrong International, Inc.Inventors: Ronald D. Schlesch, Merrill H. Armstrong, Stafford J. Vallery, Harold S. Durham