Specific Magnetization Patents (Class 310/156.43)
  • Patent number: 10317952
    Abstract: An apparatus is provided which comprises: a chassis compartment having a bottom surface and walls orthogonal to the bottom, wherein the chassis compartment comprises: a rectangular opening, which may be designed to accept a microelectromechanical (MEMS) device and four slots, which may be designed to accept one or more magnet(s), extending outwardly from the rectangular opening, wherein each of the slots comprises: an inner opening having a length coextensive with a side of the rectangular opening, and an outer opening having corresponding ends that extend a length of the outer opening beyond the length of the inner opening. Other embodiments are also disclosed and claimed.
    Type: Grant
    Filed: September 30, 2016
    Date of Patent: June 11, 2019
    Assignee: Intel Corporation
    Inventors: Sandeep S. Iyer, Amanuel Abebaw, Mark Saltas, Mayank Patel, Charavana K. Gurumurthy, Suriyakala Ramalingam, Vladimir Malamud
  • Patent number: 10259306
    Abstract: An oblique motor of a vehicle including an engine and a transmission includes a stator having a diameter formed to be smaller toward the engine; a rotor disposed inside the stator and having a diameter formed to be smaller toward the engine; a cooling member fixed to the stator and configured to cool heat generated from the stator; and a housing enclosing the cooling member and fixedly installed between the engine and the transmission.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: April 16, 2019
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Jong Won Lee, Kyoung Pyo Ha, Key Chun Park
  • Patent number: 10122223
    Abstract: To reduce eddy current loss in a supporting member of a rotor of an axial gap motor, and improve efficiency, the motor includes a rotor, and stators arranged opposite to the rotor. The rotor has a disc-shaped supporting member, having a plurality of mounting holes in each of which a permanent magnet segment is installed. In the stators, a plurality of field windings is arranged for generating a rotating magnetic field. The axial gap motor is provided with notches extending radially between each of the mounting holes of the supporting member in which a permanent magnet segment is fitted, and an outer peripheral edge of the supporting member.
    Type: Grant
    Filed: October 3, 2014
    Date of Patent: November 6, 2018
    Assignees: Dynax Corporation, National University Corporation Hokkaido University
    Inventors: Kenichi Takezaki, Wataru Hino, Koji Harada, Masatsugu Takemoto, Satoshi Ogasawara
  • Patent number: 9899886
    Abstract: A rotor element configured for movement relative to a stator includes a backing member formed, at least in part, from a ferromagnetic material; a first magnetic pole having a first polarity; and a second magnetic pole having a second polarity, opposite the first polarity. The first magnetic pole and the second magnetic pole are coupled to a first surface of the backing member such that the second magnetic pole is disposed, relative to the first magnetic pole, at a distance defined in a direction of a width of the backing member. A thickness of the backing member is varied along the width of the backing member to form a plurality of alternating first portions and second portions. The first portions include protrusions extending from a second surface of the backing member, opposite the first surface, such that the first portions are thicker than the second portions.
    Type: Grant
    Filed: April 29, 2014
    Date of Patent: February 20, 2018
    Assignee: Boulder Wind Power, Inc.
    Inventor: Brian J. Sullivan
  • Patent number: 9893581
    Abstract: A permanent magnet type rotational electric machine for an electric vehicle capable of ensuring an electric power generation torque or a peak torque instantaneously assisting a torque of an engine even by using a rare earth-less magnet and also capable of ensuring characteristics for high speed driving is provided. A rotator includes permanent magnets of which at least one side in an axial direction cross section is formed in an arc shape, and includes a plurality of permanent magnets, wherein where a center axis of a magnetic pole is denoted as d axis, and an axis that is 90 degrees from the d axis in an electrical angle is denoted as q axis, the rotator for the permanent magnet type rotational electric machine includes a first permanent magnet pair in which a line connecting a center point of the arc and the arc does not cross the d axis, and a second permanent magnet pair in which the line crosses the d axis.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: February 13, 2018
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventor: Satoshi Kikuchi
  • Patent number: 9893571
    Abstract: In a permanent magnet type electric rotating machine, a rotor is arranged in a Halbach array, a main magnet magnetized in the radial direction is formed of a rare-earth magnet and an auxiliary magnet magnetized in the circumferential direction is formed of a ferrite magnet, and a gap is provided between the main magnet and the auxiliary magnet; as a result, the quantity of utilized rare-earth magnets is reduced without the output torque of the electric rotating machine being decreased.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: February 13, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Taizo Iwami, Sachiko Kawasaki, Hiroe Fukuzumi, Yoshinori Miyamoto
  • Patent number: 9708890
    Abstract: A BOP cleaning tool includes a first pipe section with a through central channel and radial channels to external fins, with nozzles for flushing fluid from the central channel out into a BOP bore for washing cavities in the BOP bore, the central channel provided with a flow control sleeve provided with holes, the flow control sleeve displaceable from a radially closed initial first closed position to a second position with the holes aligned with the inner radial channels for starting flushing through the nozzles, and further displaceable to a radially closed third position with the holes out of alignment with the inner radial channels for halting the flushing through the nozzles.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: July 18, 2017
    Assignee: ARCHER OILTOOLS AS
    Inventor: Trond Skjeie
  • Patent number: 9667106
    Abstract: A motor housing for enclosing a first stator module and a second stator module of a motor is provided. The motor housing includes a stator housing. The stator housing has a first module portion coupled to the first stator module, wherein the first module has a first contoured shape complimentary to the first stator module. A second module portion is coupled to the second stator module, wherein the second module has a second contoured shape complimentary to the second stator module. The housing also includes a base portion having a first side coupled to the first module portion and a second side coupled to the second module portion. The base portion further includes a third side coupled to and extends between the first side and the second side. A rotor housing is coupled to the stator housing and has a fastener coupled to the third side.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: May 30, 2017
    Assignee: REGAL BELOIT AUSTRALIA PTY LTD
    Inventors: Matthew John Turner, Greg Heins, Byron Kennedy
  • Fan
    Patent number: 9348379
    Abstract: A blower fan according to a preferred embodiment of the present invention is a centrifugal fan. At least a portion of each of a plurality of blades of an impeller portion is arranged above a stator. A lower plate portion is arranged to define an air channel portion and an air outlet arranged on a lateral side of the impeller portion when a side wall portion arranged to surround an outer circumference of the impeller portion and an upper plate portion arranged above the impeller portion are present. The air channel portion is arranged to extend in a circumferential direction between an outer circumference of the stator and the side wall portion. At least a portion of a circuit board is arranged in the air channel portion and on the lower plate portion. A plurality of lead wires extending from the stator are connected to the circuit board in the air channel portion.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: May 24, 2016
    Assignee: NIDEC CORPORATION
    Inventors: Takehito Tamaoka, Hiroaki Hirano
  • Patent number: 9283421
    Abstract: An exercise apparatus is mechanically engaged with an electrical current producer so that exercise by a person using the apparatus produces output power which is used at the time of exercising or saved for later use. A motor provides additional drive force by rotating a rotor engaged with the apparatus, the rotor operating by magnetic attraction and repulsion depending on relative positions of permanent magnets on the rotor and electromagnets on a stator. The apparatus is light in weight, low cost to produce and highly durable.
    Type: Grant
    Filed: March 21, 2013
    Date of Patent: March 15, 2016
    Assignee: E. GEN LLC
    Inventor: Landon Duval
  • Patent number: 9269483
    Abstract: Numerous arrangements for permanent magnets are disclosed that can focus the flux produced by the magnets. Depending on the particular application in which the disclosed designs and techniques are used, efficiency and reliability may be increased by minimizing flux leakage, increasing peak flux density, and shaping the flux fields to improve the effective coercivity of the flux focusing permanent magnet arrangement when loaded, and to achieve customized voltage and current waveforms. The disclosed magnet assemblies may be incorporated into a machine, such as a motor/generator, having windings and may be disposed for movement relative to the windings. The magnet assembly may be mounted on a support formed of one or more ferromagnetic materials, such as a back iron. The disclosed flux focusing magnet assemblies may be formed using a variety of manufacturing methods.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: February 23, 2016
    Assignee: Boulder Wind Power, Inc.
    Inventors: James S. Smith, Robert Pillsbury, Brian J. Sullivan
  • Patent number: 9059627
    Abstract: The invention relates to a permanent magnet coupling for the synchronous transmission of torque, comprising a first member (1) having permanent magnets (4a, 4b) and a second member (2), the members being designed as inner rotor and outer rotors and separated by an air gap (3) extending between the members (1, 2), wherein the members (1, 2) are coupled to enable a synchronous movement by forces generated by the permanent magnets (4a, 4b) by the interaction with the second member (2), wherein the first member (1) comprises a first group of permanent magnets (4a) having magnetizing directions parallel to the air gap (3) and a second group of permanent magnets (4b) having magnetizing directions perpendicular to the air gap (3), wherein the permanent magnets (4a, 4b) of the first group and of the second group of the first member (1) are alternately arranged in the circumferential direction, and wherein, as viewed in the circumferential direction, the consecutive permanent magnets (4a) of the first group and the co
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: June 16, 2015
    Assignee: RINGFEDER POWER-TRANSMISSION GMBH
    Inventor: Thomas Englert
  • Publication number: 20150137647
    Abstract: Disclosed are various embodiments for a motor/generator comprising: a rotor adapted to rotate about a longitudinal axis, the rotor comprising a first partial toroidal magnetic cylinder defining a semi-circular tunnel, wherein the plurality of magnets forming the first partial toroidal magnetic cylinder have substantially all like poles facing inward toward the semi-circular tunnel, the semi-circular tunnel having an entrance and an exit forming an open throat defined by a space between the entrance and the exit, and a stator positioned about the longitudinal axis within a rotational path of the rotor.
    Type: Application
    Filed: January 29, 2015
    Publication date: May 21, 2015
    Inventor: Fred E. HUNSTABLE
  • Publication number: 20150130319
    Abstract: An annular magnet includes a hollow magnet body having an outer circumferential surface that defines a cylindrical shape and an inner circumferential surface that defines an inlet hole. The inlet hole is adapted for receiving a back iron and has a cross-section substantially shaped in an equiangular polygon. The magnet body further has a plurality of magnetic sectors that surround a central axis of the inlet hole where the magnetic sectors correspond respectively to the sides of the equiangular polygon. Each of the magnetic sectors has a magnetic polarity opposite to that of an adjacent one of the magnetic sectors.
    Type: Application
    Filed: November 11, 2013
    Publication date: May 14, 2015
    Inventors: Chao-Pi CHANG, Jia-Yuan LIANG
  • Patent number: 9030072
    Abstract: A rotor includes a rotor core with a circumferential surface facing a stator and permanent magnets each received in a corresponding slot of the rotor core. Each of the permanent magnets has a first corner portion positioned closest to the circumferential surface of the rotor core and a first side surface that intersects an imaginary line, faces toward the stator side and makes up part of the first corner portion. The imaginary line extends in the magnetization direction of the permanent magnet through the center of the permanent magnet. Between the first side surface of the permanent magnet and the inner surface of the corresponding slot, there are formed a first gap, a second gap and an abutment area from the first corner portion side in this order. The first gap has a smaller width than the second gap in a direction perpendicular to the first side surface.
    Type: Grant
    Filed: May 18, 2012
    Date of Patent: May 12, 2015
    Assignee: Denso Corporation
    Inventor: Tomokazu Hisada
  • Patent number: 9024498
    Abstract: A rotating electrical machine includes a rotor core, a stator core, and at least one permanent magnet. The rotor core has an inner circumference portion and an outer circumference portion. The stator core is opposed to the outer circumference portion of the rotor core. The at least one permanent magnet radially extends inside the rotor core. The at least one permanent magnet has an incremental circumferential width in a direction from the inner circumference portion to the outer circumference portion of the rotor core.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: May 5, 2015
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Sohji Murakami, Haruki Yahara, Mitsunori Kamo, Motomichi Ohto
  • Publication number: 20150093271
    Abstract: A brushless motor 5 of the present invention comprises: a rotor magnet 13 having a magnetized circumferential surface 13a comprising an upper circumferential surface 13a1 magnetized with a plurality of magnetic poles and a lower circumferential surface 13a2 magnetized with a plurality of magnetic poles; and a stator 30 having a stator stack 31 at least partially facing the lower circumferential surface 13a2, wherein the upper circumferential surface 13a1 of the rotor magnet 13 has a surface magnetic flux density of substantially the same level from a center of a magnetic pole until a vicinity of an adjacent magnetic pole, and the lower circumferential surface 13a2 of the rotor magnet 13 has a surface magnetic flux density decreasing from a center of a magnetic pole toward an adjacent magnetic pole.
    Type: Application
    Filed: September 19, 2014
    Publication date: April 2, 2015
    Inventor: Akiharu HIROMOTO
  • Patent number: 8994239
    Abstract: An axial flux Halbach rotor comprise: a first magnet set and a second magnet set. Further comprises: a plurality of first magnets that are respective featured by their respective first magnetizing directions and are arranged interconnecting to each other by the use of a first connecting element while allowing any two neighboring first magnets to be spaced from each other by a first distance; and the second magnet set further comprises: a plurality of second magnets that are respectively featured by their respective second magnetizing directions and are arranged interconnecting to each other by the use of a second connecting element while allowing any two neighboring second magnets to be spaced from each other by a second distance. In addition, the first magnet set and the second magnet set are arranged inlaid into each other while allowing the plural first magnets and the plural second magnets to be dispose alternatively.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: March 31, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Wen-Yang Peng, Han-Ping Yang, Cheng-Hsuan Lin, Chau-Shin Jang
  • Publication number: 20150084467
    Abstract: A reduced reaction alternating current generator including a hollow stator core, a cylindrical rotor within the stator, a freely rotating shaft coupled to the rotor, a first set of magnets in which the south pole of each magnet is coupled to the surface to the rotor and the north pole of each magnet is facing the inner surface of the hollow stator core, a second set of magnets in which the north pole of each magnet is coupled to the surface of the rotor and the south pole of each magnet is facing the inner surface of the hollow stator core and a set of silicon steel pieces coupled to the outer surface of the rotor comprised of individual silicon steel pieces positioned adjacent to and longitudinally in line with each individual magnet within the first set of magnets and each individual magnet within the second set of magnets.
    Type: Application
    Filed: April 14, 2014
    Publication date: March 26, 2015
    Inventor: Tewari Paramahamsa
  • Patent number: 8987965
    Abstract: A rotor adapted for a large permanent magnet rotating machine having high output and demagnetization resistance and the permanent magnet rotating machine are provided. The permanent rotating machine includes the rotor and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots. The rotor includes one or more permanent magnets in each of two or more insertion holes, the insertion holes being formed in a circumferential direction in a rotor core. There is also provided the permanent magnet rotating machine including this rotor and a stator disposed with a clearance from an outer peripheral face of the rotor and formed by winding a winding wire through a stator core having two or more slots.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: March 24, 2015
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hideki Kobayashi, Yuhito Doi, Takehisa Minowa
  • Publication number: 20150069876
    Abstract: Disclosed therein is variable magnetic flux motor, which includes a rotor and a stator located inside the rotor. The rotor includes a rotor housing, a plurality of unit rotor cores and magnets which are attached to the inner wall face of the rotor housing, and the unit rotor cores and the magnets are arranged in turn. The stator includes a stator core base, and a plurality of teeth radially formed on the outer peripheral surface of the stator core base at equal intervals, and each of the teeth has ears formed at both sides of an end thereof.
    Type: Application
    Filed: February 21, 2013
    Publication date: March 12, 2015
    Inventors: Jeong Cheol Jang, Je Hyung Seo, Soo Hyun Park, Woon Pil Jung, Hugh Jin Cho, Byung Taek Kim, Jin Seok Jang
  • Publication number: 20150061446
    Abstract: A rotor of a brushless motor used in a fuel pump includes a permanent magnet having first and second ends that are configured to have a thickness ratio so that a degree of margin of those ends, which is a difference between an allowable stress and a temperature stress due to expansion and contraction of a rotor core caused by a temperature change is equal to or greater than a preset value. As a result, a cracking of the permanent magnet on the both ends that is caused by repeated expansions and contractions of the rotor core is prevented.
    Type: Application
    Filed: August 28, 2014
    Publication date: March 5, 2015
    Inventors: Yuuji HIDAKA, Kiyoshi Nagata
  • Publication number: 20150054368
    Abstract: A motor includes a rotor module and a stator module. The rotor module includes a plurality of first magnet units, a plurality of second magnet units, a hollow magnetic conductance pillar and a rotating shaft. The first and second magnet units are alternately arranged to form a hollow pillar. An outer surface of the hollow pillar includes a plurality of first surfaces and second surfaces of the first and second magnet units. The first and second surfaces have different magnetic poles. The hollow magnetic conductance pillar and the rotating shaft are disposed in and through the hollow pillar and the hollow magnetic conductance pillar, respectively. The stator module includes a shell and a coil unit. The rotor module is disposed in the shell and the rotating shaft is extended out of the shell. The coil unit is disposed on an inner surface of the shell and around the rotor module.
    Type: Application
    Filed: August 14, 2014
    Publication date: February 26, 2015
    Inventor: SHENG-LIAN LIN
  • Publication number: 20150054390
    Abstract: The invention relates to an electrically driven motorcycle (1) comprising at least one electrical machine (4), which has a stationary stator (6) and a rotatably mounted rotor (7), wherein said rotor (7) has a return ring (9) with a plurality of permanent magnets (8) distributed over the circumference thereof. According to the invention, the permanent magnets are arranged in the return ring (9) like spokes with alternating tangential magnetisation. The invention further relates to a method for operating such a motorcycle.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 26, 2015
    Inventors: Norbert Martin, Stefan Demont, Armin Stubner, Michel Dietrich
  • Patent number: 8952587
    Abstract: Apparatus and method for tuning the magnetic field of windmill generators to obtain efficient operation over a broad RPM range. The windmill generator includes fixed windings (or stator) inside a rotating rotor carrying permanent magnets. The permanent magnets are generally cylindrical and have North and South poles formed longitudinally in the magnets. Magnetically conducting circuits are formed by the magnets residing in magnetic conducting pole pieces (for example, low carbon or soft steel, and/or laminated insulated layers, of non-magnetizable material). Rotating the permanent magnets, or rotating non-magnetically conducting shunting pieces, inside the pole pieces, either strengthens or weakens the resulting magnetic field to adjust the windmill generators for low RPM torque or for efficient high RPM efficiency. Varying the rotor magnetic field adjusts the voltage output of the windmill generators allowing the windmill generator to maintain a fixed voltage output.
    Type: Grant
    Filed: December 1, 2011
    Date of Patent: February 10, 2015
    Inventor: Louis J. Finkle
  • Publication number: 20150035403
    Abstract: A brushless DC motor comprises a plurality of magnets positioned at a distance from one another on a circular structure, and a plurality of solenoids provided each around a static solenoid housing, wherein said solenoid housing is structured with a void portion through which said plurality of magnets can pass when the circular structure comprising said plurality of magnets rotates around its axis.
    Type: Application
    Filed: March 19, 2013
    Publication date: February 5, 2015
    Inventors: Victor Shlakhetski, Alexander Mostovoy, Sergey Zatsarinin, Simen Shoikhedbrod
  • Publication number: 20150022043
    Abstract: A rotor in an electric motor has a plurality of permanent magnets arranged along a circumferential direction. The electric motor has a stator arrangement with a winding arrangement which surrounds, at least in parts, the permanent magnets. The stator arrangement includes a first stator having a plurality of windings and a second stator. The windings of the first and second stators are embodied, respectively, as frame-shaped coils arranged along the winding axis thereof in the radial direction. The coils of the first stator are arranged in the radial direction on the outside of the permanent magnets and the coils of the second stator are arranged in the radial direction inside the permanent magnets.
    Type: Application
    Filed: February 28, 2012
    Publication date: January 22, 2015
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Martin Hoffmann, Gerhard Huth
  • Patent number: 8937419
    Abstract: A method for producing a radially anisotropic ring magnet having at least one axial groove on the inner surface comprises using a die comprising a cylindrical, magnetic core, a magnetic sleeve having an axial ridge in alignment with the groove on the outer surface and disposed on an outer peripheral surface of the core, and an outer, cylindrical die member defining a cavity for forming the ring magnet with the magnetic sleeve, and compression-molding magnet powder charged into the cavity while applying a magnetic field in a radial direction, and a radially anisotropic ring magnet substantially having a composition of R-TM-B, wherein R is at least one of rare earth elements including Y, TM is at least one of transition metals, and B is boron, having at least one axial groove on the inner surface, and magnetized such that centerlines between magnetic poles do not overlap grooves.
    Type: Grant
    Filed: June 23, 2008
    Date of Patent: January 20, 2015
    Assignee: Hitachi Metals, Ltd.
    Inventors: Nobuyuki Hirai, Mitsutoshi Natsumeda
  • Patent number: 8928198
    Abstract: The present disclosure provides a brushless permanent magnet machine which includes an essentially circular shaped rotor, and a pair of magnets arranged in the rotor. The magnets are each U-shaped and have a thickness direction extending along a contour of the corresponding magnet between the opposite poles of the corresponding magnet, respectively. The magnets are each composed of a non-rare earth material having a lower coercivity than a rare earth material. A direction of magnetization of each of the pair of magnets is parallel to the thickness direction of the corresponding magnet. The present disclosure also provides a method of manufacturing such a brushless permanent magnet machine.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: January 6, 2015
    Assignee: UQM Technologies Inc.
    Inventors: Jon Lutz, Josh Ley
  • Publication number: 20150001980
    Abstract: An electric machine having a stator and a rotor which is mounted so as to be rotatable about a rotor axis and has a rotor body, in which at least two permanent magnets are arranged in receptacles, a first of which component magnets is associated with a first set of permanent magnets, and a second of which component magnets is associated with a second set of permanent magnets. The permanent magnets of the first set differ from the permanent magnets of the second set with respect to the material composition, In particular to the magnetic properties, and wherein at least one permanent magnet of the first or second set or at least one composite body has a contour, the cross-sectional face of which, being located perpendicularly with respect to the longitudinal axis, decreases within the respective receptacle towards that end thereof which is radially further to the outside.
    Type: Application
    Filed: September 12, 2014
    Publication date: January 1, 2015
    Inventors: Sunny ZHANG, Daniel FIEDERLING, Joachim BAUMGARTNER, Jin XU
  • Publication number: 20140375164
    Abstract: A Gaussian Surface Neodymium magnet of at least one or a plurality of spherical or any other Gaussian Surface configuration that is seated in the center of a stationary coil and whereby said magnet or plurality of magnets remains free to rotate about its axis within said coil; and whereby said magnet is capable of continuous, interrupted, or mechanically pulsed movement for the generation of electrical induced current within said stationary coil; and said magnetic field of said magnet is concentrated and focused by at least one or a plurality of focus Neodymium magnets for induced current enhancement; and whereby focus magnet fields are inline and parallel to said center rotational magnet(s).
    Type: Application
    Filed: February 25, 2013
    Publication date: December 25, 2014
    Inventors: David Deak, Ronald Ranieri, Robert Heppenheimer, David G. Deak, JR.
  • Publication number: 20140354104
    Abstract: A rotor (1) comprising a plurality of alternating magnetic poles formed by permanent magnets (3) distributed regularly between a circumferential portion (5) and a central portion (6) of the magnetic body (2) of the rotor and defining circumferential pole sections (7). The circumferential portion comprises axial grooves (15) which are arranged between the pole sections facing the magnets and which form openings in recesses (4) containing the magnets. The openings have a pre-determined first width (a) such as to minimize a leakage magnetic flux (PhiL) flowing through the circumferential portion (5) and to maximize a useful magnetic flux (PhiU) flowing radially through each of the pole sections (7).
    Type: Application
    Filed: November 6, 2012
    Publication date: December 4, 2014
    Inventors: Lilya Bouarroudj, Jean-Claude Matt, Jean-Claude Labrosse
  • Patent number: 8860273
    Abstract: Apparatus and associated methods involve thrust generation by interaction of an armature field with a stator field in an arrangement with substantially reduced flux coupling from the armature to the stator coil. In an illustrative example, solenoid coil segments may be arranged as the stator along a path of motion for the armature. In some examples, each armature may surround and overlap with at least one of the toroidal coil segments. Counter-electromotive force may be substantially reduced, for example, by stopping current flow in a stator coil while overlapped by the armature or while substantial armature flux couples to the stator coil. Thrust may be generated, in some examples, by interaction of armature and stator coil flux in arc-shaped regions external to and between each of the leading and trailing edges of the armature and their respective nearby stator coils.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: October 14, 2014
    Assignee: Flyback Energy, Inc.
    Inventors: Paul M. Babcock, David J. Babcock, Phillip N. Smith
  • Publication number: 20140265706
    Abstract: A motor includes a rotor and a stator. The rotor includes a plurality of magnets, which function as first magnetic poles, and salient poles, which function as second magnetic poles. A ratio X1:X2 of a quantity X1 of magnetic pole portions of the rotor, which is the sum of the quantity of the magnets and the quantity of the salient poles, and the quantity X2 of slots is 2n:3n (n being a natural number). The sum of a magnetic pole occupying angle ?1 of the magnet and a magnetic pole occupying angle ?2 of the salient pole is 360°. The magnetic pole occupying angle ?1 is set in a range of 180°<?1?230°.
    Type: Application
    Filed: May 27, 2014
    Publication date: September 18, 2014
    Applicant: ASMO CO., LTD.
    Inventors: Yoji YAMADA, Seiya YOKOYAMA, Shigemasa KATO, Yoshiaki TAKEMOTO, Yoko TATEISHI
  • Patent number: 8829752
    Abstract: A synchronous permanent magnet machine includes a permanent magnet arrangement for producing a magnetic field having a flux density distribution that is approximately sinusoidal. The permanent magnet arrangement includes a permanent magnet pole with both low and high energy-product magnets. The permanent magnet pole includes a low energy-product magnet and a high energy-product magnet which have different directions of magnetization, or a disposition of low/high energy-product magnets within the permanent magnet pole is asymmetric with respect to the central region of the permanent magnet pole.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: September 9, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: Jin-tao Chen, Zi-Qiang Zhu
  • Patent number: 8823235
    Abstract: An axial gap-type permanent magnetic rotating machine comprises a rotor comprising a rotating shaft having an axis of rotation, a rotor yoke of disc shape radially extending from the shaft, and a plurality of permanent magnet segments circumferentially arranged on a surface of the rotor yoke such that each permanent magnet segment may have a magnetization direction parallel to the axis of rotation, and a stator having a plurality of circumferentially arranged coils and disposed to define an axial gap with the rotor. In the rotor, each permanent magnet segment is an assembly of two or more divided permanent magnet pieces, and the coercive force near the surface of the magnet piece is higher than that in the interior of the magnet piece.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: September 2, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Naoki Watanabe, Yuhito Doi, Takehisa Minowa, Hajime Nakamura, Koichi Hirota
  • Patent number: 8797023
    Abstract: Provided is a coercive-force specifying apparatus capable of creating a demagnetization curve for each divisional area of a coercive-force distributed magnet without breaking the coercive-force distributed magnet and of specifying an average coercive force for each divisional area precisely. A coercive force specifying apparatus of the present invention includes: a yoke including an insertion space into which a coercive-force distributed magnet is to be inserted; a magnetizing coil; a search coil that detects a magnetization change when the magnetic field is applied to the coercive-force distributed magnet; and a tracer that creates a demagnetization curve on a basis of a voltage value generated due to the magnetization change. The end face is provided with two or more loop-shaped thread grooves bored therein, the search coil being provided in each thread groove.
    Type: Grant
    Filed: March 7, 2011
    Date of Patent: August 5, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masafumi Suzuki, Tomonari Kogure, Mayumi Nakanishi
  • Patent number: 8796895
    Abstract: An electric motor disposed in an electric vehicle includes a stator, a first rotor located at an outer side of the stator, and a second rotor located at an inner side of the stator, wherein each of the first rotor and the second rotor includes a plurality of first permanent magnets and a plurality of second permanent magnets, made of different materials from each other, whereby a material cost can be reduced and an output can be enhanced.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: August 5, 2014
    Assignee: LG Electronics Inc.
    Inventors: Jinha Choi, Gilwon Hong, Junyoung Lim, Jiseong Park, Hyeokjin Song, Jinsoo Park, Seungdo Han, Junggi Lee
  • Patent number: 8796896
    Abstract: An electric motor, especially a brushless PMDC motor, has a stator and a rotor rotatably installed inside of the stator. The stator has a housing with an open end, an end cap fixed to the open end of the housing, a stator core fixed to an inner surface of the housing, and windings wound on the stator core. The rotor includes a plurality of permanent magnetic poles. The housing has a flange bent inwardly from the open end of the housing and abutting against the end cap inwardly and axially to thereby fix the end cap to the housing. The length of the flange measured along the circumferential direction of the housing is greater than half of that of the housing.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: August 5, 2014
    Assignee: Johnson Electric S.A.
    Inventors: James Ching Sik Lau, Mao Xiong Jiang, Gang Li, Ke Lin Zhou, Hong Min Wei, Jie Chai, Tao Zhang
  • Patent number: 8756793
    Abstract: An interior permanent magnet (IPM) rotary machine comprises a rotor comprising a rotor yoke having bores and a plurality of permanent magnet segments disposed in the bores of the rotor yoke, each permanent magnet segment consisting of a plurality of magnet pieces. The rotor is assembled by inserting the plurality of unbound magnet pieces in each bore for stacking the magnet pieces, and fixedly securing the stacked magnet pieces in the bore.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: June 24, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Yuhito Doi, Takehisa Minowa, Hajime Nakamura, Koichi Hirota
  • Patent number: 8747583
    Abstract: This invention is a manufacturing device for a permanent magnet disposed in a rotating electrical machine, in which a plurality of magnet pieces, each formed by being fractured and split along a notch groove, are aligned and joined to each other with an adhesive interposed between fractured surfaces. First pressing means for aligning the plurality of fractured and split magnet pieces with the fractured surfaces opposed to each other in a width direction by pressing from the width direction of the permanent magnet and second pressing means for aligning the plurality of magnet pieces in a thickness direction by pressing from a thickness direction of the permanent magnet are provided. Moreover, third pressing means for joining the opposing fractured surfaces of the magnet piece with the interposed adhesive by pressing the plurality of magnet pieces from a longitudinal direction of the permanent magnet is provided.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: June 10, 2014
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Kazuhiro Takaichi, Kunitomo Ishiguro
  • Patent number: 8695210
    Abstract: A method for preparing the magnet includes the steps of: (a) providing a sintered Nd base magnet block having surfaces and a magnetization direction, (b) coating the surfaces of the magnet block excluding the surface perpendicular to the magnetization direction with a Dy or Tb oxide powder, a Dy or Tb fluoride powder, or a Dy or Tb-containing alloy powder, (c) treating the coated block at a high temperature for causing Dy or Tb to diffuse into the block, and (d) cutting the block in a plane perpendicular to the magnetization direction into a magnet segment having a coercive force distribution on the cut section that the coercive force is high at the periphery and lower toward the inside and a constant coercive force distribution in the magnetization direction.
    Type: Grant
    Filed: November 27, 2009
    Date of Patent: April 15, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koji Miyata, Takehisa Minowa, Hajime Nakamura, Koichi Hirota, Masakatsu Honshima
  • Publication number: 20140063470
    Abstract: A color wheel driving motor includes a magnet arranged radially outward of a rotor holder. The ring-shaped magnet includes n number of N-pole and n number of S-pole and magnetic pole changeover portions arranged between the poles. The magnetic pole changeover portions are arranged at an angular interval of 360°/2n, the n being a positive integer. On an imaginary plane perpendicular to the center axis, a first straight line passing through the center axis and at least one of the 2n magnetic pole changeover portions makes a specified angle ? with respect to a second straight line extending from the center axis toward the ring-shaped magnet. A first mark is arranged in a region of a surface of the ring-shaped magnet where the second straight line overlaps with the ring-shaped magnet, the specified angle ? being equal to or larger than 0° and equal to or smaller than 360°/2n.
    Type: Application
    Filed: July 16, 2013
    Publication date: March 6, 2014
    Inventors: Peng Li, Dongxu Zhang
  • Patent number: 8664822
    Abstract: A rotor for an interior permanent synchronous machine. A rotor core structure includes an outer cylindrical wall juxtaposed to an air gap. A plurality of arcuately-shaped cavities is formed within the rotor core structure. The plurality of arcuately-shaped cavities is substantially concentrically layered with respect to an outer cylindrical wall of the rotor core structure. Each arcuately-shaped cavity extending between first and second end sections is juxtaposed to the outer cylindrical surface wall of the rotor structure and includes an intervening center section. A plurality of permanent magnets is inserted within the plurality of arcuately-shaped cavities. Each first end section retains a respective first permanent magnet having a first magnet field strength. Each second end section retains a respective second permanent magnet having the first magnetic field strength.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: March 4, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Rajeev Vyas, Thomas Wolfgang Nehl, Alexandru Rajala, Chandra S. Namuduri
  • Patent number: 8664824
    Abstract: A Halbach array is radially disposed in an environment optimized for efficiency and controlled for efficient generation and use of power in order to generate, establish, and maintain a desired level of rotational energy with enhanced efficiency and in order to make the most efficient use of electromotive forces and magnetic fields which are either intentionally created for the operation of the apparatus or which result from the operation of the apparatus.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: March 4, 2014
    Assignee: Maglev Energy, Inc.
    Inventors: Martin Epstein, Jon Eric Harms
  • Patent number: 8638017
    Abstract: In connection with a permanent magnet rotary machine comprising a rotor comprising a rotor core and a plurality of permanent magnet segments embedded in the rotor core and a stator comprising a stator core having a plurality of slots and windings therein, the rotor and the stator being disposed to define a gap therebetween, or a permanent magnet rotary machine comprising a rotor comprising a rotor core and a plurality of permanent magnet segments mounted on the surface of the rotor core and a stator comprising a stator core having a plurality of slots and windings therein, the rotor and the stator being disposed to define a gap therebetween, the rotor wherein each of the permanent magnet segments is an assembly of further divided permanent magnet pieces, and the coercive force near the surface of the magnet piece is higher than that in the interior of the magnet piece.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: January 28, 2014
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Takehisa Minowa, Hajime Nakamura, Koichi Hirota, Minori Miyata, Atsushi Miyata
  • Patent number: 8638016
    Abstract: An electromagnetic structure comprises a rotor assembly having at least one circular magnetic structure. The structure has opposing first and second surfaces that extend around a peripheral boundary region. A plurality of emission regions are disposed along said peripheral boundary region, with each emission region presenting poles having opposite polarities of a first polarity and a second polarity on the opposing first and second surfaces of the circular magnetic structure. Adjacent emission regions have alternating pole orientations such that each emission source having the first polarity is between two emission sources having the second polarity and each emission source having the second polarity is between two emission sources having the first polarity. A rotational element rotates the at least one circular magnetic structure about a rotation axis that is perpendicular to the opposing first and second surfaces.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: January 28, 2014
    Assignee: Correlated Magnetics Research, LLC
    Inventors: Larry W. Fullerton, Mark D. Roberts
  • Patent number: 8624457
    Abstract: An increase of the magnetization current can be prevented during demagnetization and magnetization, and a variable speed operation can be achieved at a high power output over a wide range of from a low speed to a high speed. A rotor (1) is configured by a rotor core (2), a variable magnetic force magnet (3) and a fixed magnetic force magnet (4). A variable magnetic force magnet (3) and a fixed magnetic force magnet (4a) are overlapped in the magnetization direction thereof to form a series of magnets. The series of magnets is located within the rotor core at a position where the magnetization direction is in the direction of a d-axis. On either side of the series of magnets of the variable magnetic force magnet (3) and the fixed magnetic force magnet (4a), fixed magnetic force magnets (4b, 4b) are located at a position where the magnetization direction is in the direction of the d-axis.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: January 7, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuto Sakai, Yutaka Hashiba, Norio Takahashi, Kazuaki Yuuki
  • Publication number: 20140001910
    Abstract: A plurality of lamination steel sheets that form a rotor core are stacked so that the lamination steel sheets are angularly shifted from each other, and a plurality of cavities are formed. Permanent magnets are molded and disposed in the cavities by injection molding. Each permanent magnet has a uniform plate thickness, and is bent with respect to an axial direction so as to have a triangular wave shape or an S shape. The permanent magnets are magnetized after being disposed in the cavities. The paired magnet pieces have poles of the same polarity, which face each other in the circumferential direction of a rotor, and each of the magnet pieces is magnetized in directions of normals to a surface of the magnet piece, the surface having a linear sectional shape.
    Type: Application
    Filed: June 17, 2013
    Publication date: January 2, 2014
    Inventor: Yoshiyuki SHIBATA
  • Publication number: 20130320796
    Abstract: A rotor for an interior permanent synchronous machine. A rotor core structure includes an outer cylindrical wall juxtaposed to an air gap. A plurality of arcuately-shaped cavities is formed within the rotor core structure. The plurality of arcuately-shaped cavities is substantially concentrically layered with respect to an outer cylindrical wall of the rotor core structure. Each arcuately-shaped cavity extending between first and second end sections is juxtaposed to the outer cylindrical surface wall of the rotor structure and includes an intervening center section. A plurality of permanent magnets is inserted within the plurality of arcuately-shaped cavities. Each first end section retains a respective first permanent magnet having a first magnet field strength. Each second end section retains a respective second permanent magnet having the first magnetic field strength.
    Type: Application
    Filed: May 30, 2012
    Publication date: December 5, 2013
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: RAJEEV VYAS, THOMAS WOLFGANG NEHL, ALEXANDRU RAJALA, CHANDRA S. NAMUDURI