Patents by Inventor David James Powell
David James Powell 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: 10680502Abstract: A magnetically geared apparatus (400), a pole piece component (420) and a plurality of pole pieces (422) for such apparatus are disclosed. The magnetically geared apparatus (400) comprises the pole piece component (420) and the pole piece component (420) comprises the plurality of pole pieces (422) mounted to a carrier (421), wherein at least one of the pole pieces (500) comprises at least two axially-spaced portions spaced apart by a portion of a higher magnetic reluctance (560) than that of each of the two axially-spaced portions.Type: GrantFiled: August 23, 2016Date of Patent: June 9, 2020Assignee: MAGNOMATICS LIMITEDInventors: David James Powell, Petr Chmelicek
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Patent number: 10102953Abstract: An apparatus and method for holding permanent magnet components, particularly on a rotor of an electrical machine. A magnet carrier (10) comprises a channel (30) suitable for receiving an encircling magnet retainer (20) and a method of manufacturing a magnet assembly (100) comprises providing a magnet carrier (10) comprising a channel (30), mounting a magnet (60) on the magnet carrier (10), and encircling the magnet (60) and magnet carrier (10) with a magnet retainer (20), wherein the magnet retainer (20) passes through the channel (30).Type: GrantFiled: March 10, 2014Date of Patent: October 16, 2018Assignee: Magnomatics LimitedInventors: David James Powell, Jeffrey George Birchall
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Publication number: 20180269770Abstract: A magnetically geared apparatus (400), a pole piece component (420) and a plurality of pole pieces (422) for such apparatus are disclosed. The magnetically geared apparatus (400) comprises the pole piece component (420) and the pole piece component (420) comprises the plurality of pole pieces (422) mounted to a carrier (421), wherein at least one of the pole pieces (500) comprises at least two axially-spaced portions spaced apart by a portion of a higher magnetic reluctance (560) than that of each of the two axially-spaced portions.Type: ApplicationFiled: August 23, 2016Publication date: September 20, 2018Inventors: David James Powell, Petr Chmelicek
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Patent number: 9985512Abstract: An electrical machine is provided comprising a first rotor, wherein the first rotor includes a support structure, a second rotor, a stator and, wherein the first rotor, second rotor and stator are arranged concentrically about a shaft, and at least one of the second rotor and the stator is adapted to accommodate the support structure. An electrical machine is also provided comprising a shaft having an axis, at least one first rotor, at least one second rotor, at least two stators and, wherein the first rotor, second rotor and stators are arranged axially along the shaft and extend from the axis.Type: GrantFiled: November 23, 2015Date of Patent: May 29, 2018Assignee: Magnomatics LimitedInventors: David James Powell, Stuart David Calverley
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Patent number: 9425655Abstract: A pole piece support comprising a frame having a spaced array of non-magnetic support structures, wherein disposed between at least a pair of adjacent non-magnetic support structures is a magnetic pole piece supported along at least a portion of its body by the adjacent non-magnetic support structures.Type: GrantFiled: May 12, 2009Date of Patent: August 23, 2016Assignee: MAGNOMATICS LIMITEDInventors: Stuart David Calverley, David James Powell
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Publication number: 20160087517Abstract: An electrical machine is provided comprising a first rotor, wherein the first rotor includes a support structure, a second rotor, a stator and, wherein the first rotor, second rotor and stator are arranged concentrically about a shaft, and at least one of the second rotor and the stator is adapted to accommodate the support structure. An electrical machine is also provided comprising a shaft having an axis, at least one first rotor, at least one second rotor, at least two stators and, wherein the first rotor, second rotor and stators are arranged axially along the shaft and extend from the axis.Type: ApplicationFiled: November 23, 2015Publication date: March 24, 2016Inventors: David James Powell, Stuart David Calverley
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Publication number: 20160020008Abstract: An apparatus and method for holding permanent magnet components, particularly on a rotor of an electrical machine. A magnet carrier (10) comprises a channel (30) suitable for receiving an encircling magnet retainer (20) and a method of manufacturing a magnet assembly (100) comprises providing a magnet carrier (10) comprising a channel (30), mounting a magnet (60) on the magnet carrier (10), and encircling the magnet (60) and magnet carrier (10) with a magnet retainer (20), wherein the magnet retainer (20) passes through the channel (30).Type: ApplicationFiled: March 10, 2014Publication date: January 21, 2016Inventors: David James Powell, Jeffrey George Birchall
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Patent number: 9219395Abstract: An electrical machine is provided comprising a first rotor (121), wherein the first rotor includes a support structure (163), a second rotor (131), a stator (141) and, wherein the first rotor, second rotor and stator are arranged concentrically about a shaft (50), and at least one of the second rotor and the stator is adapted to accommodate the support structure. An electrical machine is also provided comprising a shaft (50) having an axis, at least one first rotor (321), at least one second rotor (331), at least two stators (341a), (341b) and, wherein the first rotor, second rotor and stators are arranged axially along the shaft and extend from the axis.Type: GrantFiled: May 17, 2011Date of Patent: December 22, 2015Assignee: Magnomatics LimitedInventors: David James Powell, Stuart David Calverley
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Patent number: 8508095Abstract: A flux-switching machine stator comprising two or more C-cores, each C-core having two legs and a back portion joining the legs, and a permanent magnet arranged between legs of adjacent C-cores. Each leg has a main portion and a tip portion further from the back portion characterized in that the tip portion of each leg is angled relative to the main portion of the respective leg.Type: GrantFiled: September 30, 2008Date of Patent: August 13, 2013Assignee: Rolls-Royce PLCInventors: Stephen Mark Husband, David James Powell, Zi-Qiang Zhu, Geraint Wyn Jewell, Arwyn Thomas
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Publication number: 20130200623Abstract: The present invention provides an electrical machine for use in marine generation comprising a marine turbine, a first rotor mechanically connected to the marine turbine, a second rotor and a stator. The first rotor is configured to transfer torque to the second rotor in a magnetically geared manner, and the second rotor is configured to induce an AC voltage in the stator.Type: ApplicationFiled: November 17, 2010Publication date: August 8, 2013Applicant: MAGNOMATICS LIMITEDInventors: David James Powell, Stuart David Calverley
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Patent number: 8487500Abstract: A component of an electric machine 46, the component comprising a core 10; two or more teeth 14 extending radially therefrom; at least one electromagnetic winding 12, each winding 12 around at least one of the teeth 14; wherein the core 10 having a cooling arrangement including at least one cooling insert 48 located between adjacent windings 12 and whereby in use a cooling fluid being arranged to flow through the at least one cooling insert 48 to facilitate heat transfer and dissipation from the electromagnetic windings 12. The cooling inserts providing improved cooling, structural support to the windings, and electrical insulation between the windings and the core.Type: GrantFiled: January 23, 2008Date of Patent: July 16, 2013Assignee: Rolls-Royce PLCInventors: John James Anthony Cullen, David James Powell
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Publication number: 20130134815Abstract: An electrical machine is provided comprising a first rotor (121), wherein the first rotor includes a support structure (163), a second rotor (131), a stator (141) and, wherein the first rotor, second rotor and stator are arranged concentrically about a shaft (50), and at least one of the second rotor and the stator is adapted to accommodate the support structure. An electrical machine is also provided comprising a shaft (50) having an axis, at least one first rotor (321), at least one second rotor (331), at least two stators (341a), (341b) and, wherein the first rotor, second rotor and stators are arranged axially along the shaft and extend from the axis.Type: ApplicationFiled: May 17, 2011Publication date: May 30, 2013Applicant: Magnomatics LimitedInventors: David James Powell, Stuart David Calverley
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Patent number: 8193750Abstract: Electrical machine arrangements have advantages with regard to providing local electrical power and starting. Embedding such electrical machine arrangements in machinery such as gas turbine engines is advantageous in removing mechanical linkages and reducing aerodynamic drag. However, the components utilized must be able to withstand harsh environmental conditions and therefore the DC link capacitor used for smoothing of voltage fluctuations are limited to relatively low capacitance densities. Low density DC link capacitors require large sizes which render electrical machines less acceptable for embedded usage. By providing offset of electrical current in inductance elements such as stator windings and stator coils of electrical machines in dead periods of the cycle a reduction in DC link capacitor requirements is achieved reducing the size, weight and complexity of installing electrical machines in gas turbine engines.Type: GrantFiled: March 4, 2009Date of Patent: June 5, 2012Assignee: Rolls-Royce PLCInventors: David Reginald Trainer, Harsh Agarwal, Stephen Mark Husband, Gareth Edward Moore, David James Powell, Stephen Andrew Long
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Publication number: 20110121672Abstract: A pole piece support comprising a frame having a spaced array of non-magnetic support structures, wherein disposed between at least a pair of adjacent non-magnetic support structures is a magnetic pole piece supported along at least a portion of its body by the adjacent non-magnetic support structures.Type: ApplicationFiled: May 12, 2009Publication date: May 26, 2011Applicant: MAGNOMATICS LIMITEDInventors: Stuart David Calverley, David James Powell
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Publication number: 20090091198Abstract: A flux-switching machine stator comprising two or more C-cores, each C-core having two legs and a back portion joining the legs, and a permanent magnet arranged between legs of adjacent C-cores. Each leg has a main portion and a tip portion further from the back portion characterized in that the tip portion of each leg is angled relative to the main portion of the respective leg.Type: ApplicationFiled: September 30, 2008Publication date: April 9, 2009Applicant: ROLLS-ROYCE PLCInventors: Stephen Mark Husband, David James Powell, Zi-Qiang Zhu, Geraint Wyn Jewell, Arwyn Thomas
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Patent number: 5869767Abstract: An ultrasonic transducer (10) comprises a flexible transmitter (18), a flexible receiver array (22), and flexible electrodes (14), (16), (20), for the transmitter and receiver. The elements of the transducer are arranged such that the transducer may be flexed for conformity with surfaces of test specimens of a variety of non-planar configurations.Type: GrantFiled: August 28, 1997Date of Patent: February 9, 1999Assignee: University of StrathclydeInventors: Gordon Hayward, David James Powell