Pole Shoes Fixed To Hub Or Shaft Patents (Class 310/156.59)
  • Patent number: 10158265
    Abstract: An embedded permanent magnet type motor, which has one pole configured of two permanent magnets and has a plurality of poles of permanent magnets embedded in a rotor, includes a rotor whose magnet embedding holes communicate with a rotor outer periphery. The rotor has, between adjacent poles, a q-axis projection projecting in a direction away from a rotor rotation center. The magnet embedding holes are disposed so as to form an inverted V shape. An outer peripheral edge portion on the outer side of the permanent magnets has a curvature radius smaller than the distance from a rotation center axis to a rotor outermost peripheral portion. Circular intermediate plates of an outside diameter larger than the outside diameter of rotor steel plates are provided in intermediate positions in the rotor in a rotor rotation axis direction.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: December 18, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Toshiharu Mochida, Akio Toba, Hiroshi Shimada, Hirofumi Nishimura
  • Patent number: 10063115
    Abstract: Provided is a rotor for use in an inner rotor-type motor, comprising a plurality of magnets arranged in a circumferential direction around the center axis, and a rotor core formed of a magnetic material. The rotor core has an inner core part and a plurality of outer core parts. The plurality of outer core parts and the plurality of magnets are alternately arranged in a circumferential direction at a radially outer side of the inner core part. The magnet has a pair of circumferential end surfaces which are magnetic pole surface, and at least one of them is a protruded surface. Also, the magnet has a portion of which circumferential width is wider than a circumferential width of an outer end surface. For this reason, the volume of the magnet can be increased and the magnetic force of the rotor can be increased, without the need to increase the diameter of the rotor. As a result, when such rotor is incorporated into a motor, the torque of the motor can be improved.
    Type: Grant
    Filed: December 25, 2013
    Date of Patent: August 28, 2018
    Assignee: NIDEC CORPORATION
    Inventor: Akira Ichien
  • Patent number: 10020701
    Abstract: A rotor includes: a rotor core; a plurality of magnets; and an adhesive that adhesively bonds the magnet to the rotor core. The magnets are housed in the magnet holders such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core. The adhesive includes: a first adhesive part that adhesively bonds two interior surfaces of the magnet holder facing the circumferential direction to the magnet and that reaches one of ends of the magnet in a direction of axis of the magnet; and a second adhesive part that adhesively bonds, on a side of one of end surfaces of the rotor core in a direction of axis of the rotor core, said end surface of the rotor core to an end surface of the magnet in an axial direction of the magnet and that is connected to the first adhesive part.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: July 10, 2018
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Toshihiro Kamiyoshihara, Shinya Ishihara
  • Patent number: 9847704
    Abstract: An improved rotor assembly configured for magnets with differing lengths, and methods and systems for manufacturing the same. The rotor assembly may be created by selectively creating first and second tabs extending into apertures of lamination sheets. The first and second tabs may be selectively removed, depending on the different magnet lengths and the specific lamination sheet, according to one of a first finishing schedule and a second finishing schedule. The lamination sheets are stacked with any remaining first and second tabs, and other features, aligned.
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: December 19, 2017
    Assignee: GM Global Technology Operations LLC
    Inventors: Edward L. Kaiser, Peter J. Savagian, Khwaja M. Rahman
  • Patent number: 9712007
    Abstract: A rotor core includes a laminated steel body including a plurality of magnetic core plates stacked one above another. The core plates extend in a direction perpendicular or substantially perpendicular to a vertical center axis. The rotor core includes a plurality of magnetic pole portions arranged along a circumferential direction. At least some of the core plates include claws protruding from the magnetic pole portions in the circumferential direction and outer connection portions arranged radially outward of the claws to interconnect the magnetic pole portions adjoining to each other. The claws restrain the magnets from being displaced radially outward by centrifugal forces. In addition, the outer connection portions restrain the rotor core from being deformed by centrifugal forces. The outer connection portions restrain the claws from being displaced by centrifugal forces so as to further restrain displacement of the magnets.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: July 18, 2017
    Assignee: NIDEC CORPORATION
    Inventor: Takeshi Tanaka
  • Patent number: 9509185
    Abstract: A rotor includes a shaft, a plurality of permanent magnets arranged around the shaft in a circumferential direction for permanent excitation and attached to the shaft by an adhesive bond, and a flux conducting device provided for conducting a magnetic flux of the permanent magnets. The flux conducting device has a plurality of soft-magnetic flux conducting elements. Each flux conducting element is placed between two of the permanent magnets and adhesively bonded thereto.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 29, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Daniel Mader, Rolf Vollmer
  • Patent number: 9419480
    Abstract: A rotor arrangement includes a support structure providing a mounting surface extending in an axial direction and a circumferential direction. The support structure is adapted to rotate around the axial direction. A first permanent magnet system is arranged at the mounting surface at a first circumferential region. A second permanent magnet system is arranged at the mounting surface at a second circumferential region. A circumferential distance between the first magnet system and the second magnet system at a first axial position differs from the circumferential distance between the first magnet system and the second magnet system at a second axial position.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: August 16, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Mohammad Kimiabeigi
  • Patent number: 9379583
    Abstract: A magnet assembly is disclosed. The magnet assembly includes a base element and a magnet attached to a first surface of the base element. A second surface of the base element opposite to the first surface of the base element includes a contour, which is adapted to engage with a complementary contour of a support structure of a rotor arrangement. It is further described a method for engaging a magnet assembly to a support structure of a rotor arrangement, a rotor arrangement for an electromechanical transducer, an electromechanical transducer and a wind turbine.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: June 28, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: James Kenneth Booth
  • Patent number: 9130441
    Abstract: A brushless DC motor includes a plurality of permanent magnet segments arranged on an outer circumferential surface of a yoke member. Each of the permanent magnet segments includes a thinnest portion positioned in a circumferential center portion of each of the permanent magnet segments, thickest portions positioned in circumferential opposite end portions of each of the permanent magnet segments, and gradually changing portions positioned between the thinnest portion and the thickest portions. The gradually changing portions have a thickness gradually increasing from the thinnest portion toward the thickest portions. A border between the magnetic poles is positioned in the circumferential center portion of each of the permanent magnet segments.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: September 8, 2015
    Assignee: Nidec Techno Motor Holdings Corporation
    Inventor: Takeshi Okada
  • Patent number: 9083226
    Abstract: A brushless motor has a stator and a rotor. The stator has a stator core and stator windings. The stator core has a stator yoke and teeth extending radially inwardly from the stator yoke. The stator windings are formed by concentrated coils wound on the teeth. The rotor has a rotor shaft, a rotor core fixed to the rotor shaft and magnets fixed in slots formed in the rotor core. Each magnet is plate shaped and extends in both axial and radial directions of the rotor and each magnet is magnetically charged across its thickness so that a rotor pole is formed between two adjacent magnets. The ratio of the radial thickness (Y) of the stator yoke to the width (T) of the tooth body is from 0.4 to 0.7.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: July 14, 2015
    Assignee: JOHNSON ELECTRIC S.A.
    Inventors: Yue Li, Jian Zhao, Yong Wang, Ya Ming Zhang, Yan Hong Xue, Mao Xiong Jiang
  • Patent number: 8987971
    Abstract: A rotor core is provided for an electric machine. The rotor core includes a body extending a length along, and being configured to rotate about, a central longitudinal axis. The body includes spokes arranged radially about the central longitudinal axis and conductor openings arranged radially about the central longitudinal axis. The radial arrangement of the spokes and conductor openings about the central longitudinal axis includes an alternating pattern of spokes and conductor openings. The spokes include slots extending therethrough along the central longitudinal axis. The slots are positioned radially about the central longitudinal axis between adjacent conductor openings. The rotor core also includes conductors extending within the conductor openings of the body.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: March 24, 2015
    Assignee: General Electric Company
    Inventors: Patel Bhageerath Reddy, Manoj Shah
  • Patent number: 8957555
    Abstract: A wind turbine rotary electric machine having a tubular body, in turn having a cylindrical wall; and a plurality of clips formed integrally with the cylindrical wall and configured so that each pair of facing clips defines a seat for housing an active sector.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: February 17, 2015
    Assignee: Wilic S.AR.L.
    Inventors: Otto Pabst, Matteo Casazza
  • Publication number: 20140375162
    Abstract: Exemplary embodiments disclose a rotor of an electric motor and an electric motor using the same. The rotor includes a core which includes a plurality of protrusion portions which are arranged along an outer circumference of the core and protrude radially to an outer portion of the core, and a plurality of concave portions interposed between the protrusion portions; a plurality of permanent magnets which are respectively disposed at the plurality of concave portions; and a plurality of pole pieces which are disposed at the plurality of concave portions and at outer sides of the plurality of permanent magnets. A length of each of the plurality of pole pieces in an axial direction is shorter than a length of each of the plurality of protrusion portions in the axial direction.
    Type: Application
    Filed: June 20, 2014
    Publication date: December 25, 2014
    Applicants: SAMSUNG ELECTRONICS CO., LTD., Kyungpook National University Industry-Academic Cooperation Foundation
    Inventors: Won-ho KIM, Seong-taek LIM, Hong-soon CHOI, Jin-woo CHO
  • Patent number: 8810100
    Abstract: A rotor having a dividable core for an electric motor, and a production method thereof. A rotor has a generally annular supporting member; a plurality of shaft portions positioned on the supporting member in a circumferential direction at regular intervals, the shaft portions extending generally parallel to a rotation axis of the rotor; and a plurality of divided cores each having a hole portion which is fitted to each shaft portion. By annularly connecting the divided cores, a generally annular dividable core for the rotor is formed. Each divided core has connecting portions at both circumferential ends thereof, and each connecting portion is configured to be connected to a connecting portion of a neighboring divided core while the divided core is fitted to the shaft portion.
    Type: Grant
    Filed: November 28, 2012
    Date of Patent: August 19, 2014
    Assignee: Fanuc Corporation
    Inventor: Tatsuya Senoo
  • Patent number: 8766508
    Abstract: A rotor for a motor is provided including: a rotor core including at least one a first coupling portion on an outer circumference thereof, wherein the first coupling portion includes a first coupling groove or a first coupling projection; at least one division core spaced apart from the rotor core and including a second coupling portion on an outer circumference thereof, the second coupling portion including a second coupling groove or a second coupling projection; and a connecting pin including a third coupling portion and a fourth coupling portion, the third coupling portion to be coupled to the first coupling portion and the fourth coupling portion to be coupling to the second coupling portion.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: July 1, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sung-Hyuk Park
  • Patent number: 8723383
    Abstract: A buried-magnet internal rotor (1) for an electric rotating machine, the rotor including a shaft (2), a plurality of polar parts (30) made of a magnetic material surrounding the shaft, the polar parts delimiting housings (40) between them, a first lateral shroud (5) and a second lateral shroud (5?) axially on each side of the polar parts along the shaft (2), the shaft passing through each lateral shroud through a central opening in each lateral shroud, at least one tie-rod (6) per polar part, the tie-rod clamping each polar part between the lateral shrouds, permanent magnets (4) placed in the housings (40), wherein the shaft includes, for the first lateral flange (5), an internal shoulder (22) designed to form an axial abutment against which the first flange is held axially by an external ring (26) secured to the shaft.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: May 13, 2014
    Assignees: Michelin Recherche et Technique S.A., Compagnie Generale des Establissments Michelin
    Inventors: Maeick Blanc, Frederic Progin
  • Patent number: 8487496
    Abstract: A retention system in which rotor pole pieces are retained within complementarily shaped channels in a rotor hub, permanent magnets are secured between the pole pieces and within clamp members, and wedge-shaped pieces are used to apply positive locking forces along the axial length of each clamp member and of adjacent pole pieces. A curable resin preferably in disposed within gaps between the permanent magnets and the clamp members.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: July 16, 2013
    Assignee: DRS Power Technology, Inc.
    Inventors: Costin Ifrim, Michael Pothier, James S. Smith, Art O'Leary
  • Patent number: 8330317
    Abstract: Embodiments of the invention provide for conical magnets for rotors in electrodynamic machines, methods to design the same, and rotor-stator structures for electrodynamic machines. In various embodiments, a rotor-stator structure for electrodynamic machine can include field pole members and conical magnets. According to at least some embodiments, one or more of the conical magnets can include a magnetic region configured to confront one or more air gaps. The magnetic region can be substantially coextensive with one or more acute angles to the axis of rotation. The magnetic region can also include a surface positioned at multiple radial distances from the axis of rotation in a plane perpendicular to the axis of rotation.
    Type: Grant
    Filed: June 27, 2011
    Date of Patent: December 11, 2012
    Assignee: NovaTorque, Inc.
    Inventors: Donald Burch, John Patrick Petro, Jeremy Franz Mayer
  • Patent number: 8159103
    Abstract: A rotor (11) for an electric machine with low-inertia permanent magnets (13) located between the poles (15) of the electric machine and a rotor hub, where the rotor hub is comprised of an internal ferrule (21) and an intermediate ring (23) between it and said magnets (13), with said intermediate ring (23) being made of an amagnetic material (such as aluminum, a composite material or a plastic material) of minimum thickness which prevents flux losses, and with the internal ferrule (21) being made of a metal material (such as cast iron or steel) with sufficient thickness to resist, together with the intermediate ring (23), the mechanical stresses caused by rotor (11) operation.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: April 17, 2012
    Assignee: Gamesa Innovation & Technology, S.L.
    Inventors: Rafael Rodriguez Rodriguez, Jaime Peredo Argos
  • Patent number: 8018110
    Abstract: An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: September 13, 2011
    Assignee: General Electric Company
    Inventors: James Pellegrino Alexander, Ayman Mohamed Fawzi EL-Refaie, Murtuza Lokhandwalla, Manoj Ramprasad Shah, Jeremy Daniel VanDam
  • Patent number: 7932658
    Abstract: An electric machine includes a stator, and a rotor positioned adjacent the stator and configured to rotate with respect to the stator. The rotor includes a plurality of laminations having an outside diameter and stacked in a stackwise direction. Each lamination includes a plurality of non-linear slots positioned inward of the outside diameter. Each non-linear slot includes an inner portion spaced a first distance from the outside diameter and two end portions disposed a second distance from the outside diameter. The second distance is smaller than the first distance. The rotor also includes a plurality of permanent magnets. Each magnet is disposed in one of the non-linear slots.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: April 26, 2011
    Assignee: A.O. Smith Corporation
    Inventor: Dan M. Ionel
  • Patent number: 7911104
    Abstract: A retention system in which rotor pole pieces are retained within complementarily shaped channels in a rotor hub, permanent magnets are secured between the pole pieces and within clamp members, and wedge-shaped pieces are used to apply positive locking forces along the axial length of each clamp member and of adjacent pole pieces. A curable resin preferably in disposed within gaps between the permanent magnets and the clamp members.
    Type: Grant
    Filed: March 10, 2009
    Date of Patent: March 22, 2011
    Assignee: DRS Power Technology, Inc.
    Inventors: Costin Ifrim, Michael R. Pothier, James S. Smith, Art O'Leary
  • Publication number: 20090284095
    Abstract: A motor rotor includes a hub having a peripheral wall. A metal ring includes an engaging portion. The metal ring is formed by bending a strip of metal plate to form a cylindrical ring. The metal plate includes first and second positioning portions on two ends thereof. The first and second positioning portions are coupled with each other to form the engaging portion. The metal ring is coupled to an inner peripheral face of the peripheral wall of the hub. A magnet ring is coupled to an inner peripheral face of the metal ring.
    Type: Application
    Filed: June 20, 2008
    Publication date: November 19, 2009
    Inventors: Alex Horng, Chih-Wen Wu
  • Publication number: 20080265707
    Abstract: Disclosed herein is an electric machine rotor. The rotor includes, a rotatable shaft, a plurality of pole segments attached to the shaft, and a plurality of magnets attached to the plurality of pole segments such that one of the plurality of magnets is positioned circumferentially between adjacent pole segments and each of the plurality of magnets has nonparallel circumferentially opposing sides.
    Type: Application
    Filed: April 27, 2007
    Publication date: October 30, 2008
    Applicant: REMY INTERNATIONAL, INC.
    Inventor: Michael D. Bradfield
  • Patent number: 7362024
    Abstract: Disclosed is a rotor of a BLDC motor including a frame rotatably disposed on an inner circumference of a stator, rotor teeth connected to the outer circumference of the frame in the radial direction at regular intervals, and magnets fixed between the rotor teeth, and arranged in the radial direction so that the facing sides can have the same polarity. The rotor of the BLDC motor improves a torque of the motor by minimizing flux leakage of the magnets.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: April 22, 2008
    Assignee: LG Electronics Inc
    Inventors: Young-Kwan Kim, Deok-Jin Kim, Sung-Ho Lee, Jin-Soo Park
  • Patent number: 6847145
    Abstract: Encapsulation of a permanent magnet rotor is achieved by applying a glass roving material to spaces in the rotor structure, applying a veil cloth around the outer surface of the rotor, mounting a vacuum bag with vacuum ports around the outer surface of the rotor, removing vent plugs from the end walls of the rotor and screws from an inner ring of the rotor and replacing them with vacuum ports and applying a vacuum to the vacuum ports. After air has been removed from the rotor, an encapsulating resin is applied to some of the ports to introduce resin into the interior of the rotor. After curing of the resin the vacuum bag is removed and the outer surface of the rotor is machined to the desired outer dimension of the rotor.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: January 25, 2005
    Assignee: Electric Boat Corporation
    Inventors: Pieter Van Dine, Alberto Franco, Spyro Pappas, Mervin Laparre
  • Patent number: 6822368
    Abstract: Rotary permanent magnet motors have salient stator poles with nonuniform pole thickness in the radial direction for compensating effects of cogging torque. Pole base portions terminate at pole shoes at the radial air gap. The pole shoes extend in the circumferential direction from the bulkier base portions. Variation of the thickness of the pole shoe changes the concentration of the effective flux at the point of coupling between the stator poles and the permanent magnet pole shoes. As there is no change in the active interfacing area of the pole shoes a uniform air gap is maintained. The torque signature for each stator pole/rotor permanent magnet interface can be selectively changed to smooth motor operation by configuring the stator pole shoe thickness to vary along its circumferential extent as appropriate. Pole shoes may have tapered leading or trailing edges with respect to a pole base to change the effective flux density in the air gap at a specific pitch of rotation.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: November 23, 2004
    Assignee: Wavecrest Laboratories, LLC
    Inventors: Boris A. Maslov, Zareh Soghomonian
  • Patent number: 6713923
    Abstract: To provide an orientation device capable of efficiently orientating resinous magnets filled in slits of a rotor core. An orientation device comprising a plurality of permanent magnets 5 disposed at the same intervals as slits 2 in the rotor core 1 with their magnetic poles of the same polarity adjacent to each other, along the outside circumference of a rotor core housing section 4 for housing the rotor core 1, and a plurality of pole pieces 6 disposed between the plurality of permanent magnets 5, wherein the width of the pole piece 6 at the end 6a on the side of the rotor core housing section 4 is no larger than the maximum width &agr; max of an outermost slit 2a of the rotor core 1 between opposite ends thereof.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: March 30, 2004
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Haruyoshi Hino, Shinya Naito
  • Patent number: 6448680
    Abstract: The invention concerns a rotating electric machine which includes a stator equipped with armature coils and a rotor mounted rotating inside the stator. The rotor having a series of magnets with alternating polarities juxtaposed with magnetic parts having magnetic resistance, respectively associated with the magnets. Each assembly of one magnet and one associated magnetic part defining a rotor pole wherein some of the poles have alternately, along a generally tangential direction, a magnet followed by its magnetic part and a magnet preceded by its magnetic part. The invention is applicable to motor vehicle alternators and AC starters.
    Type: Grant
    Filed: October 11, 2000
    Date of Patent: September 10, 2002
    Assignee: Valeo Equipements Electriques Moteur
    Inventor: Antoine Dokou Akemakou