Particular To Switch Reluctant Machine Patents (Class 310/216.075)
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Patent number: 10312780Abstract: Various embodiments are described herein for a double-rotor switched reluctance machine with segmented rotors. In one example embodiment, the double-rotor switched reluctance machine comprises an interior rotor, an exterior rotor spaced from the interior rotor and concentrically disposed outside the interior rotor, and at least one stator disposed concentrically with the interior rotor and the exterior rotor. The interior rotor, the exterior rotor and the at least one stator are disposed within one machine set to provide an interior switched reluctance machine and an exterior switched reluctance machine. In the various embodiments described herein, at least one of the interior rotor and the exterior rotor comprises an array of magnetically isolated segments and filler segments. The interior switched reluctance machine and the exterior switched reluctance machine can operate as two motors, two generators, or a motor and a generator simultaneously.Type: GrantFiled: October 21, 2015Date of Patent: June 4, 2019Assignee: McMaster UniversityInventors: Teng Guo, Nigel Schofield, Ali Emadi
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Publication number: 20150091403Abstract: A transverse flux machine includes a stator having a circular coil wound in a rotational direction, a plurality of first ferromagnets arranged in the rotational direction, each of the first ferromagnets surrounding a part of the circular coil; and a rotor arranged to face the first ferromagnets across a gap, the rotor being rotatable about a center axis of the circular coil; wherein the rotor includes a plurality of second ferromagnets arranged in the rotational direction; and a flux-generation part arranged between adjacent ones of the second ferromagnets, each of the second ferromagnets to generate a magnetic field in the rotational direction.Type: ApplicationFiled: May 30, 2014Publication date: April 2, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Yasuhito Ueda
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Publication number: 20150084465Abstract: According to one embodiment, a rotary electric machine includes a rotor that is rotatable at a predetermined position and includes a plurality of first magnetic members arranged along an outer circumferential surface, the first magnetic members each including a first magnetic pole and a second magnetic pole. The rotary electric machine includes a first supporting member that surrounds a periphery of the rotor. The rotary electric machine includes a plurality of second supporting members that are fixed to an inner circumferential surface of the first supporting member. The rotary electric machine includes a plurality of second magnetic members that are fixed on side surfaces of the second supporting members and that have a third magnetic pole facing the first magnetic pole with an air gap and a fourth magnetic pole facing the second magnetic pole with an air gap.Type: ApplicationFiled: September 11, 2014Publication date: March 26, 2015Inventors: Hiroshi TAKAHASHI, Yasuhito Ueda
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Publication number: 20150042201Abstract: The present invention relates to a multiphase segmented high-power synchronous machine with transversal flux guidance consisting of at least two or more double segments. The two or more double segments form segments of a linear motor or generator or segments of a rotating motor or generator. The two or more double segments consist of a row of permanent magnets and soft-magnetic yokes with one or more circumferential windings. As a result of a bidirectional structure in each case winding currents of the same magnitude flow through two equally large segments. As a result of a phase-shifted arrangement of the yokes, the thrust torque is effected in the same direction of motion. The yokes can be arranged folded down or lying side by side.Type: ApplicationFiled: March 19, 2013Publication date: February 12, 2015Inventor: Helene ORTLOFF
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Patent number: 8952591Abstract: An electrical machine rotor includes a flux-conducting portion and a flux-inhibiting portion. The flux-conducting portion is conducive to conveying an electromagnetic flux and has a plurality of salient rotor poles and a portion of back material. The flux-inhibiting portion is less conducive to conveying an electromagnetic flux than the flux-conducting portion and is disposed entirely outside the boundaries of the rotor poles.Type: GrantFiled: October 31, 2011Date of Patent: February 10, 2015Assignee: Regal Beloit America, Inc.Inventor: Krishnan Ramu
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Patent number: 8901798Abstract: A two-phase switched reluctance machine is provided using discontinuous core structures as the stator for low-cost, high-performance drives. This discontinuous stator core structure contains short flux paths and maximum overlap between the rotor poles and stator poles in the stator discontinuous core structures, regardless of the rotor position. Example configurations of such core structure include E-core, L-core and I-core configurations. Using less steel and magnet wire than in conventional SRM designs results in cost savings of stator material and winding material. Efficiency of this novel SRM is improved because of shorter flux paths resulting in reduction of core losses and decreased phase resistance resulting in reduction of copper losses. Two-phase simultaneous excitation of the novel SRM can reduce torque ripple during commutation as compared with existing two-phase SRMs.Type: GrantFiled: May 30, 2008Date of Patent: December 2, 2014Assignee: Regal Beloit America, Inc.Inventors: Krishnan Ramu, Nimai Lobo, Cheewoo Lee
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Publication number: 20140252913Abstract: A reluctance machine includes a stator plate supporting stator poles circumferentially distributed about a first central opening and a rotor plate supporting stator poles circumferentially distributed about a second central opening. A rotation shaft is mounted to the rotor plate in the second central opening, the shaft passes through the first central opening to define an axis of rotation. The rotor and stator poles extend perpendicular from the rotor and stator plates, respectively, and support flux paths during single phase actuation which include a first flux portion passing through each stator pole parallel to the axis of rotation and a second portion passing through each rotor pole parallel to the axis of rotation. The flux paths cross an air gap between the stator and rotor poles from the first portion to the second portion.Type: ApplicationFiled: March 7, 2014Publication date: September 11, 2014Applicant: EVERETTE ENERGY, LLCInventor: Babak Fahimi
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Patent number: 8803376Abstract: An AC motor is provided. In the AC motor, there are M pieces (M is an integer of 3 or more) of stator pole groups SPG are arranged in a rotor axis direction, where each of the stator poles groups is composed of a plurality of stator poles which are for the same phase and arranged in a circumferential direction of the motor. Between the stator pole groups SPG, “M?1” pieces of annular windings WR are arranged which allow one-way current to flow therethrough. The windings WR are arranged such that the directions of current passing therethrough are reversed in turn in the rotor axis direction. The stator pole groups SPG are excited to generate magnetic fluxes ?G directed in a one way. The excited directions of the magnetic fluxes ?G are reversed in turn in the rotor axis direction.Type: GrantFiled: May 11, 2011Date of Patent: August 12, 2014Assignee: Denso CorporationInventors: Masayuki Nashiki, Tomokazu Ishikawa
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Patent number: 8736128Abstract: Electromagnetic devices and near field plates for three-dimensional magnetic field manipulation are disclosed. In one embodiment, an electromagnetic device includes a rotor, a stator, and a magnetic field focusing device. The rotor may include a rotor body and a plurality of radially extending rotor poles. The stator may include a plurality of stator poles radially extending inwardly from a stator body toward the rotor body. Each stator pole may have a magnetic flux generating device and a stator pole tip, wherein an air gap may be located between each stator pole tip and each corresponding rotor pole. The magnetic field focusing device is coupled to at least one stator pole tip and produces a magnetic field profile having at least one concentrated magnetic flux region proximate the stator pole tip. The magnetic field focusing device twists the magnetic field profile by an angle ?.Type: GrantFiled: August 10, 2011Date of Patent: May 27, 2014Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.Inventors: Ercan Mehmet Dede, Jaewook Lee, Debasish Banerjee
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Patent number: 8736136Abstract: A switched reluctance motor includes a stator and a rotor, the stator having stator poles supporting a magnetic field focusing device such as a near field plates on each stator pole tip. An example near field plate has a spatially modulated surface reactance configured so as to focus magnetic flux extending from each pole tip within at least one region of increased magnetic field proximate the pole tip.Type: GrantFiled: February 16, 2011Date of Patent: May 27, 2014Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.Inventors: Jaewook Lee, Ercan Mehmet Dede, Debasish Banerjee, Hideo Iizuka
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Publication number: 20130113320Abstract: An electrical machine stator assembly comprises: an electroconductive coil arranged circumferentially with respect to the rotational axis; a plurality of pairs of side lamination assemblies arranged circumferentially with respect to the rotational axis; a plurality of pairs of switch lamination assemblies arranged circumferentially with respect to the rotational axis and positioned adjacent ends of side lamination assemblies proximal the rotor; and at least one tooth associated with each switch lamination assembly and proximal the rotor. Each switch lamination assembly comprises a first group of laminated materials aligned generally circumferentially and generally in a first direction with respect to the rotational axis, the first direction being one selected from the group consisting of the axial and radial directions with respect to the rotational axis.Type: ApplicationFiled: November 7, 2012Publication date: May 9, 2013Applicant: Electric Torque Machines, Inc.Inventor: Electric Torque Machines, Inc.
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Publication number: 20120146448Abstract: A rotor for a synchronous reluctance machine includes a plurality of rotor modules disposed in an axial sequence along a common axis. Each rotor module includes a plurality of poles disposed in adjacent sectors about the common axis, each pole including a plurality of magnetic segments spaced apart from one another in radial direction, a support plate, provided on an axial side of the plurality of poles, and fastening means for fastening the plurality of poles to the support plate. The fastening means, preferably a plurality of axially arranged bolts or an adhesive, bonds the plurality of poles to the support plate.Type: ApplicationFiled: February 14, 2012Publication date: June 14, 2012Inventors: Reza Rajabi Moghaddam, Yujing Liu, Cedric Monnay, Pierluigi Tenca
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Patent number: 8198778Abstract: A rotary actuator includes a stator assembly positioned within an outer enclosure. A rotor assembly is positioned adjacent to the stator and is configured to rotate relative thereto and about a centerline axis of the rotary actuator. Each of the outer enclosure, the stator assembly, and the rotor assembly are arranged to carry a magnetic flux therethrough and form a flux path loop, such that as a magnetic flux flows through the outer enclosure, the stator assembly, and the rotor assembly, a torque is generated by rotation of the rotor assembly relative to the stator assembly.Type: GrantFiled: May 27, 2011Date of Patent: June 12, 2012Assignee: Woodward, Inc.Inventor: Kevin Allen Bischel
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Patent number: 8138652Abstract: A compact, rugged, variable reluctance, variable speed, electric motor capable of producing high torque at high electrical energy conversion efficiencies is provided. The present invention provides for a multi-stage motor design having a number of discreet rotor and stator elements on a common shaft. This configuration provides for the simplest of magnetic structures and produces a powerful magnetic flux modelling design technique that is used to further optimize the motor design and subsequent control logic. Thermal mapping of the magnetic mass provides for advanced cooling techniques that are used to ensure long in-service life in the most extreme of industrial applications. The electric motor inherently provides low vibration thereby greatly reducing noise; low turn to turn voltage potentials thereby eliminating costly phase to phase shorting potential; efficient motor operation through the reduction in switching and copper losses in both the machine and its control system.Type: GrantFiled: August 22, 2008Date of Patent: March 20, 2012Assignee: Sunco Investments LimitedInventors: John A Davis, Iain C Davis, Feisal A Hurzook
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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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Publication number: 20110254401Abstract: A permanent-magnet switched-flux (PMSF) device has an outer rotor mounted to a shaft about a central axis extending axially through the PMSF device. First and second pluralities of permanent-magnets (PMs) are respectively mounted in first and second circles, radially outwardly in first and second transverse planes extending from first and second sections of the central axis adjacent to an inner surface of the outer rotor. An inner stator is coupled to the shaft and has i) a stator core having a core axis co-axial with the central axis; and ii) first and second pluralities of stator poles mounted in first and second circles, radially outwardly from the stator core axis in the first and second transverse planes. The first and second pluralities of PMs each include PMs of alternating polarity.Type: ApplicationFiled: May 26, 2011Publication date: October 20, 2011Applicant: Board of Regents of the Nevada System of Higher Education on Behalf of the University of NevadaInventors: Andrzej M. Trzynadlowski, Ling Qin
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Patent number: 7973445Abstract: A rotary actuator includes a stator assembly positioned within an outer enclosure. A rotor assembly is positioned adjacent to the stator and is configured to rotate relative thereto and about a centerline axis of the rotary actuator. Each of the outer enclosure, the stator assembly, and the rotor assembly are arranged to carry a magnetic flux therethrough and form a flux path loop, such that as a magnetic flux flows through the outer enclosure, the stator assembly, and the rotor assembly, a torque is generated by rotation of the rotor assembly relative to the stator assembly.Type: GrantFiled: January 14, 2008Date of Patent: July 5, 2011Assignee: Woodward Controls Inc.Inventor: Kevin Allen Bischel
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Patent number: 7923888Abstract: Disclosed is a switched reluctance motor which can reduce noise and prevent overheating in rotation of a rotor. The switched reluctance motor includes: a stator core having a plurality of inwardly protruded poles at predetermined intervals; coils wound around the protruded poles of the stator core; and a rotor core being rotatably housed inside the stator core with a predetermined gap, and having a plurality of outwardly protruded poles along the radial direction, and round units protruded from the front ends of each protruded pole of the rotor core starting to meet each protruded pole of the stator core, so that gaps between the protruded poles of the stator core and the protruded poles of the rotor core can be gradually reduced.Type: GrantFiled: October 19, 2006Date of Patent: April 12, 2011Assignee: LG Electronics Inc.Inventors: Sang-Young Kim, Jun-Young Lim
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Patent number: 7893590Abstract: In a stator, when a number of a plurality of core segments circumferentially arranged is represented as n, a length of a maximum projecting portion of a circumferential projection of each of the plurality of core segments from one of the first and second radial sides thereof is represented as p, a radial length of a maximum projecting portion of the circumferential projection of each of the plurality of core segments from a circumferentially extended line from the bottom of the slot is represented as q, and a length of the slot with respect to the bottom thereof in a radial direction of the stator core assembly is represented as t, the number n, the length p, the length q, and the length t meet the following equation: 0 < np ? - q < t .Type: GrantFiled: July 1, 2009Date of Patent: February 22, 2011Assignee: Denso CorporationInventors: Ryosuke Utaka, Shigenobu Nakamura
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Publication number: 20110018383Abstract: A permanent-magnet switched-flux (PMSF) device has an outer rotor mounted to a shaft about a central axis extending axially through the PMSF device. First and second pluralities of permanent-magnets (PMs) are respectively mounted in first and second circles, radially outwardly in first and second transverse planes extending from first and second sections of the central axis adjacent to an inner surface of the outer rotor. An inner stator is coupled to the shaft and has i) a stator core having a core axis co-axial with the central axis; and ii) first and second pluralities of stator poles mounted in first and second circles, radially outwardly from the stator core axis in the first and second transverse planes. The first and second pluralities of PMs each include PMs of alternating polarity.Type: ApplicationFiled: January 12, 2010Publication date: January 27, 2011Applicant: Board of Regents of the Nevada System of Higher Education on Behalf of the University of Nevada,Inventors: Andrzej M. Trzynadlowski, Ling Qin
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Patent number: 7868506Abstract: Flux-switching electrical machines. In particular, a flux-switching electrical machine having a stator and a rotor. The stator has permanent magnets, armature windings and excitation windings, and the rotor has no winding or permanent magnet but includes a plurality of flux-switching teeth. The stator is generally formed by a succession of elementary cells, each cell being intended to interact with only a single tooth of the rotor at a time. Each cell includes one of the permanent magnets; a first slot for at least partly housing one of the excitation windings at least; and second slots for housing one of the armature windings.Type: GrantFiled: March 8, 2007Date of Patent: January 11, 2011Assignee: Centre National de la Recherche Scientifique (CNRS)Inventors: Emmanuel Kiên Lôc Hoang, Michel Roger René Lecrivain, Mohamed Gabsi
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Patent number: 7804269Abstract: A switched reluctance machine has salient poles on the stator and rotor. The windings of the machine are supplied from a converter which provides energization at a chosen rate. The windings of the machine may be energized at the rate at which the rotor poles pass the stator poles, or it may be operated at a fraction of that rate by energizing the windings to cooperate with every second, third or fourth rotor pole. This can extend the output of the machine.Type: GrantFiled: February 15, 2008Date of Patent: September 28, 2010Assignee: Switched Reluctance Drives LimitedInventor: Steven Paul Randall
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Publication number: 20100213786Abstract: According to one embodiment of the present invention, an electric machine comprises a stator and a rotor. The stator has at least one stator pole with a first leg and a second leg. The rotor has at least one rotor pole. The rotor rotates relate to the stator. The at least one rotor is configured to rotate between the first leg and the second leg of the at least one stator pole.Type: ApplicationFiled: February 15, 2010Publication date: August 26, 2010Applicants: The Texas A&M University System, StarRotor CorporationInventors: Mark T. Holtzapple, George A. Rabroker, Babak Fahimi, Mehrdad Ehsani
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Patent number: 7774921Abstract: A horizontal axis washing machine includes a clothing receptacle rotated by a 4 pole rotor. A 36 slot stator having an interior bore with an interior diameter receives the 4 pole rotor in magnetic coupling relation and capable of operating within a flux weakening range of at least 5:1. The stator has a ratio of an interior diameter to a minimum exterior diameter greater than or equal to 0.63:1.Type: GrantFiled: February 19, 2010Date of Patent: August 17, 2010Assignee: Emerson Electric Co.Inventors: Keith I. Hoemann, Gary E. Horst
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Patent number: 7709989Abstract: A combination of a unique construction format, involving two sets of rotor and stator embodiments, working in co-operation with each other, in a unique fixed, direct-axis and quadrature-axis orientation, and with unique field-winding, back-EMF cancellation, connection schemes to substantially negate the field-winding harmonic currents in the field-winding excitation circuits, and provide for a substantially square-wave shaped, open-terminal, armature output-voltage characteristic.Type: GrantFiled: November 14, 2007Date of Patent: May 4, 2010Inventor: Larry Llewellyn Smith
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Patent number: 7692350Abstract: A horizontal axis washing machine includes a clothing receptacle rotated by a 4 pole rotor. A 36 slot stator having an interior bore with an interior diameter receives the 4 pole rotor in magnetic coupling relation and capable of operating within a flux weakening range of at least 5:1. The stator has a ratio of an interior diameter to a minimum exterior diameter greater than or equal to 0.63:1.Type: GrantFiled: February 28, 2007Date of Patent: April 6, 2010Assignee: Emerson Electric Co.Inventors: Keith I. Hoemann, Gary E. Horst
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Publication number: 20100052439Abstract: A rotary reluctance motor includes a set of inner disks each having an inner diameter root, an outer diameter free end, and a plurality of alternating high permeability teeth and low permeability material segments. A set of outer disks is interleaved with the inner disks to form a disk stack. Each outer disk has an outer diameter root, an inner diameter free end, and a plurality of alternating high permeability teeth and low permeability material segments. The inner and outer disks are configured to bear against and support each other in response to axial magnetic forces. Flux return portions are disposed axially adjacent the disks at each end of the disk stack. A coil is associated with the roots of one of the sets of disks and configured to provide axial flux through the disk stack to rotate one set of disks with respect to the other set of disks.Type: ApplicationFiled: April 24, 2008Publication date: March 4, 2010Inventor: Steven D. Potter