Patents by Inventor Norman Neilson Fulton
Norman Neilson Fulton 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: 9246363Abstract: A rotating electrical machine has a rotor composed of laminations having salient poles. The poles have one or more holes which are positioned so as to reduce the peak stress experienced by the laminations when the rotor is rotating. The holes are chosen according to a disclosed design procedure which gives a reduction in peak stress for a given limit on the output of the machine.Type: GrantFiled: May 11, 2011Date of Patent: January 26, 2016Assignee: NIDEC SR DRIVES, LTDInventors: Phillip George Dickinson, Paul Andrew Sykes, Norman Neilson Fulton, Thilak Raj Durairaj
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Publication number: 20110285242Abstract: A rotating electrical machine has a rotor composed of laminations having salient poles. The poles have one or more holes which are positioned so as to reduce the peak stress experienced by the lamination when the rotor is rotating. The holes are chosen according to a disclosed design procedure which gives a reduction in peak stress for a given limit on the output of the machine.Type: ApplicationFiled: May 11, 2011Publication date: November 24, 2011Applicant: NIDEC SR DRIVES LTD.Inventors: Phillip George Dickinson, Paul Andrew Sykes, Norman Neilson Fulton, Thilak Raj Durairaj
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Patent number: 7888896Abstract: A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimized and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.Type: GrantFiled: April 28, 2010Date of Patent: February 15, 2011Assignee: Switched Reluctance Drives LimitedInventors: Norman Neilson Fulton, Peter Richard Mayes
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Publication number: 20100211231Abstract: A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimized and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.Type: ApplicationFiled: April 28, 2010Publication date: August 19, 2010Applicant: Switched Reluctance Drives LimitedInventors: Norman Neilson Fulton, Peter Richard Mayes
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Patent number: 7737646Abstract: A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimized and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.Type: GrantFiled: September 13, 2007Date of Patent: June 15, 2010Assignee: Switched Reluctance Drives LimitedInventors: Norman Neilson Fulton, Peter Richard Mayes
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Patent number: 7560845Abstract: A rotor for a switched reluctance machine has its main magnetic circuit provided by two mouldings of soft magnetic composite. The mouldings are substantially identical and fit together to form a magnetic circuit which, by virtue of its design, has a very low inductance in the unaligned position. The portions of the magnetic circuit lie beyond the active length of the rotor poles and the flux path is described in three dimensions.Type: GrantFiled: September 19, 2006Date of Patent: July 14, 2009Assignee: Switched Reluctance Drives LimitedInventors: Phillip George Dickinson, Norman Neilson Fulton
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Publication number: 20080074063Abstract: A drive system has a number of electrical machines. One machine operates as a generator supplying an output to a DC link, which in turn supplies one or more machines operating as motors to drive loads. The motors are supplied through power converters. The total capacitance of the DC link is minimised and the link kept in a stable condition by preventing it falling to a hazardous level. One embodiment prevents the phase currents adding in such a manner as to reduce the DC link voltage. Another embodiment employs freewheeling in the phase currents to prevent the DC link voltage falling below a predetermined threshold.Type: ApplicationFiled: September 13, 2007Publication date: March 27, 2008Applicant: Switched Reluctance Drives LimitedInventors: Norman Neilson Fulton, Peter Richard Mayes
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Patent number: 6536701Abstract: A coil former allows transposition between layers of turns in a coil to be accomplished without damage. The transpositions can be made in a short side of the coil. The former has finned portions which guide the wire into the correct locations during winding. When the coil is wound, the former is disassembled and the end portions are pulled towards the center of the former and turned through 90° to be removed. A method of using the former is described.Type: GrantFiled: April 3, 2001Date of Patent: March 25, 2003Assignee: Switched Reluctance Drives LimitedInventors: Norman Neilson Fulton, Paul Greenhough
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Publication number: 20010025897Abstract: A coil former allows transposition between layers of turns in a coil to be accomplished without damage. The transpositions can be made in a short side of the coil. The former has finned portions which guide the wire into the correct locations during winding. When the coil is wound, the former is disassembled and the end portions are pulled towards the center of the former and turned through 90° to be removed. A method of using the former is described.Type: ApplicationFiled: April 3, 2001Publication date: October 4, 2001Applicant: Switched Reluctance Drives LimitedInventors: Norman Neilson Fulton, Paul Greenhough
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Patent number: 5866966Abstract: An electrical machine such as a switched reluctance motor includes a stator including a stator body, a plurality of poles each having an energizing coil, and a rotor. Portions of the coils are retained in channels between adjacent poles and by a wedge tied at each end to projections extending from the stator body. The manner of retaining the wedge avoids disturbance of the flux linkage in the stator poles and allows improved locating and retaining of the coils in the channels between stator poles.Type: GrantFiled: March 11, 1997Date of Patent: February 2, 1999Assignee: Switched Reluctance Drives LimitedInventor: Norman Neilson Fulton
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Patent number: 5760519Abstract: A stator for electric machine, in particular a switched reluctance machine, has a non-circular, for example, square, outer profile and a set of equi-angularly spaced stator poles which are angularly arranged to be intermediate radially thickest and thinnest parts of the ring to avoid the poles coinciding with vibrational antinodes of the outer ring. In a particular embodiment the outer profile is square and the stator poles are angularly offset from a line of symmetry drawn through the center of the square at right angles to one pair of opposite sides.Type: GrantFiled: September 4, 1997Date of Patent: June 2, 1998Assignee: Switched Reluctance Drives LimitedInventor: Norman Neilson Fulton
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Patent number: 5747962Abstract: A method and apparatus for increasing the starting torque of a two-phase switched reluctance motor is disclosed. The method involves the use of a specially constructed rotor position transducer with two sensing devices, each associated with one phase winding of the two-phase motor. The signals from the rotor position transducer are provided to a motor controller that energizes each winding whenever energization of the winding will produce torque in the desired direction.Type: GrantFiled: June 7, 1995Date of Patent: May 5, 1998Assignee: Switched Reluctance Drives LimitedInventor: Norman Neilson Fulton
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Patent number: 5654601Abstract: A reluctance machine comprises a rotor, defining rotor poles and a stator defining stator poles. Each stator pole pair, creating a flux path through the rotor includes only one winding mounted on one of the stator poles. The invention is particularly applicable to a machine having a four-pole field pattern and an odd number of phases. The coils are placed on alternate stator poles such that the space between stator poles can be used exclusively for a single winding. The single winding is made larger to compensate for the lack of a winding on its associated pole.Type: GrantFiled: June 7, 1995Date of Patent: August 5, 1997Assignee: Switched Reluctance Drives, Ltd.Inventor: Norman Neilson Fulton