Different Thicknesses Patents (Class 310/216.018)
  • Patent number: 11811283
    Abstract: A stator for a radial-flux rotary electric machine includes a yoke with a plurality of teeth, each tooth extending from a root at the yoke to a tip. The stator further includes a plurality of coils, each one of which being located on a respective one of the plurality of teeth, the coils being sized such that a slot fill factor is between zero and unity to define axial voids in the slots. The stator further includes a plurality of magnetic sealing members, each one of which being engaged with the tips of adjacent teeth to circumferentially and axially seal the axial voids in the slots for retaining an axial flow of coolant therein, the magnetic sealing members being composed of a magnetic material to provide a flux path between adjacent tooth tips to increase an amount of leakage flux.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: November 7, 2023
    Assignee: ROLLS-ROYCE PLC
    Inventor: David F. Brookes
  • Patent number: 10505420
    Abstract: In a rotary electric machine that has excellent efficiency and light weight, a rotor (21) of a motor (23) includes a rotary shaft (24), a rotor core (61) that is fixed coaxially to the rotary shaft (24) and formed of electromagnetic steel, a first end plate (71) that is disposed to face a first end face (61a) of the rotor core (61), and a second end plate (72) that is disposed to face a second end face (61b) of the rotor core (61). The first end plate (71) and the second end plate (72) are formed of a bond magnet.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: December 10, 2019
    Assignee: Honda Motor Co., Ltd.
    Inventor: Atsushi Asahi
  • Patent number: 9502939
    Abstract: A method for manufacturing a stator configured to ensure insulation properties between a conductor and an armature core while preventing a manufacturing cost from increasing and preventing a space factor from lowering. In an edge-removing step, a plurality of independent edge-removing punches, which correspond to one slot S or two or more slots S, press and chamfer a corner portion of an axial opening edge of the slot in an axial end core sheet of the armature core.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: November 22, 2016
    Inventors: Yoshimasa Kinpara, Takahiro Yamamoto, Jirou Hayashi, Asuka Tanaka
  • Patent number: 8677608
    Abstract: An annular core member having an opening portion located at a position rotated by 90 degrees from a reference position, where the opening portion is oriented in the counterclockwise direction, and an annular core member having the opening portion located at the reference position, where the opening portion is oriented in the clockwise direction, are prepared to form an iron core by a rotary lamination apparatus by rotating the annular core members and by a predetermined angle (90 degrees) such that a first end, in the annular core member, which is at the position rotated by 90 degrees from the reference position and has no rotation uneven part, is circumference-positionally identical in the laminating direction with that of a fourth end, in an annular core member, which is at the reference position and has no rotation uneven part.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: March 25, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroyuki Akita, Kimiyasu Furusawa
  • Patent number: 8581468
    Abstract: A stator includes an annular stator core that is comprised of a plurality of stator core segments, an outer ring that is fitted on the radially outer surfaces of the stator core segments so as to fasten them together, and a stator coil mounted on the stator core. Each of the stator core segments is formed of a plurality of stator core sheets that are laminated in the axial direction of the stator core. Each of the stator core sheets has a reinforcement portion that includes a recess formed in one of the major surfaces of the stator core sheet and a protrusion formed on the other major surface. The stator core sheets are laminated so that for each adjoining pair of the stator core sheets, the protrusion of one of the stator core sheets is fitted in the recess of the other stator core sheet.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: November 12, 2013
    Assignee: Denso Corporation
    Inventors: Yuichi Kudose, Yusuke Hara, Takashi Hoshiyama
  • Patent number: 8564166
    Abstract: A motor structure including a stator assembly having a stator core and a winding and a rotor assembly embedded therein having a rotor core and a permanent magnet. The stator core includes a yoke and a plurality of teeth protruding inwards from the yoke. Two adjacent teeth form a wire embedding slot and the winding is placed inside the wire embedding slot and winds around the teeth. The rotor core includes an annular ring having a central axial pore and a plurality of magnetic induction blocks protruding outwards from an outer side of the annular ring. Two adjacent magnetic induction blocks form a radial recess for mounting the permanent magnet. The section of an outer side surface of the magnetic induction blocks is a circular-arc line. The outer side surface employs a point with a distance deviating from the center of the central axial pore as a center of circle.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: October 22, 2013
    Assignee: Zhongshan Broad-Ocean Motor Manufacturing Co., Ltd.
    Inventor: Mingpan Pan
  • Patent number: 8552612
    Abstract: A stator core 10 and its manufacturing method, the stator core 10 including laminated stator core sheets 17, each of the stator core sheets 17 punched out from a magnetic metal sheet 32, a central portion of the magnetic metal sheet 32 previously punched out to form a rotor core sheet 36, the stator core 10 including a thin section 24 formed in a magnetic pole piece 19 of each of the stator core sheets 17, the thin section 24 formed by pressing both sides of the magnetic pole piece 19 in a thickness direction and radially-inwardly elongating the magnetic pole piece 19. The present invention prevents the magnetic pole piece 19 from being curved and improves interlocking accuracies and dimensional accuracies in blanking the rotor core sheet 36 and the start core sheet 17 from one magnetic metal sheet 32.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: October 8, 2013
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Akihiro Hashimoto, Yusuke Hasuo
  • Patent number: 8456057
    Abstract: A laminated stator core 10, formed by laminating stator core sheets 17, each of the stator core sheets 17 punched out from a magnetic metal sheet 32 so as to have a common axis with a rotor core sheet 36 which punched out from the magnetic metal sheet 32 before the stator core sheet 17 is punched out; the stator core sheet 17 including a thin section 24 in a magnetic pole shaft piece 20; the thin section 24 formed by pressing a part or a whole of a magnetic pole shaft piece 20 in a thickness direction, and elongating the same in a radially inward direction; and further the thin section 24 having a thickness within 50-95% of that of the magnetic metal sheet 32 and a radial length within 30-100% of that of the magnetic pole shaft piece 20. This enables a magnetic pole piece 19 to be elongated to form the thin section 24 without adverse effect on magnetic characteristics thereof, and improves caulking accuracy and dimensional accuracy for blanking both of the core sheets 17, 36 from one magnetic metal sheet 32.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: June 4, 2013
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Yusuke Hasuo, Kazunori Ouchi
  • Publication number: 20130049553
    Abstract: Disclosed herein is a spindle motor including: a rotor part including a shaft and a rotor case coupled to the shaft to rotate integrally with the shaft, having a rotor magnet coupled to an inner side thereof, and having a disk mounted on one surface thereof; and a stator part including a base plate having the rotor part coupled thereto, a bearing part rotatably supporting the shaft, and an armature having a stator core part coupled to an outer peripheral surface of the bearing part so as to face the rotor magnet and a coil wound several times around the stator core part, wherein the stator core part is formed by stacking a plurality of stator cores having different thickness ratios.
    Type: Application
    Filed: June 5, 2012
    Publication date: February 28, 2013
    Inventors: Jin Sun MIN, Ho Jun YOO
  • Patent number: 8288913
    Abstract: An electric induction motor assembly includes a rotor assembly and a stator assembly. The rotor assembly includes an exposed bar rotor comprising a plurality of axially stacked, punched-to-size rotor laminations. The stator assembly includes a plurality of axially stacked, punched-to-size stator laminations. Each of the laminations presents an axial thickness of less than 0.024 inches. The rotor assembly and the stator assembly cooperatively define a radially extending air gap between a radially outer periphery of the rotor assembly and a radially inner periphery of the stator assembly that is less that 0.012 inches.
    Type: Grant
    Filed: April 20, 2010
    Date of Patent: October 16, 2012
    Assignee: Nidec Motor Corporation
    Inventors: Thomas M. Bourquin, Samuel E. Mayberry, John H. Hussey, Alan D. Crapo
  • Publication number: 20120235535
    Abstract: There is provided a rotary electric machine. A stator is formed by laminating first steel plates and second steel plates, which are formed from an identical magnetic material and having an identical planar shape but different thickness dimensions. Hence, in contrast to a motor/generator (a comparative example) including a stator formed by laminating steel plates having an identical thickness dimension, with which a single resonance frequency is generated (such that a peak value is large), two resonance frequencies are generated, and therefore the peak value can be dispersed between the respective resonance frequencies (such that the peak value is small).
    Type: Application
    Filed: March 5, 2012
    Publication date: September 20, 2012
    Inventors: Takeshi Watanabe, Makoto Saito
  • Patent number: 8084913
    Abstract: The present invention relates to a motor having a stator with a magnetized rotor rotatably positioned in the stator. The stator and the rotor each have at least two magnetic poles. At least one of the stator poles has a different area confronting the poles of the rotor than the other stator poles. An air gap is positioned between each of the at least two stator poles and at least two rotor poles. The distance of the air gap between each stator pole and each rotor pole is different. A coil is wound upon a bobbin which is placed about at least one of the stator poles. Altering the confronting area of the stator poles allows a larger bobbin and coil to be placed about the stator pole.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: December 27, 2011
    Assignee: BorgWarner Inc.
    Inventors: Robert J. Telep, Robert D. Keefover
  • Patent number: 7986072
    Abstract: A stator core of an electric rotating machine has steel sheets formed of a steel plate wound in the cylindrical shape. Each sheet has teeth disposed along the circumferential direction of the core on the inner side of the sheet, divided end portions disposed along the circumferential direction on the outer side of the sheet, slits alternately disposed with the divided end portions along the circumferential direction, and a boundary portion disposed between the group of teeth and the group of divided end portions. The teeth and the divided end portions substantially have the same constant thickness. The boundary portion has a changing thickness decreased toward the outer side.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: July 26, 2011
    Assignee: Denso Corporation
    Inventor: Takashi Tokizawa
  • Publication number: 20110140566
    Abstract: A rotating electrical machine includes: a rotor comprising a rotor core and a field winding wound round the rotor core; and a stator comprising a stator core and a stator winding wound round the stator core. The stator is arranged in opposition to the rotor with a predetermined spacing therebetween. the stator core is formed by punching a split piece, which comprises teeth for insertion of the stator winding thereinto and a core back on an outer periphery thereof, from a magnetic steel sheet, and laminating a plurality of those circular configurations in an axial direction, in which a plurality of the split pieces are arranged in a circle in a circumferential direction. The stator core has magnetic steel sheets, which are different in magnetic permeability in a diametrical direction, laminated at an axial end region of and in an axial central region of the stator core.
    Type: Application
    Filed: February 25, 2011
    Publication date: June 16, 2011
    Inventors: Akihito NAKAHARA, Hiroyuki MIKAMI, Kazumasa IDE, Kazuhiko TAKAHASHI, Kenichi HATTORI
  • Patent number: 7768173
    Abstract: A stator for an electrical machine includes teeth assembled from a plurality of stacked laminations mounted on a cylindrical protective surface thereby forming a plurality of slots. The stator also includes an armature winding assembled within the teeth by inserting components of the armature winding into the plurality of stator slots from positions external to the teeth in a manner that facilitates mitigating potential for coil distortion. The armature winding includes a plurality of coils that each include an end winding. The stator further includes a segmented yoke inserted around the armature winding in a manner that facilitates mitigating a potential for disturbing the end winding of the coils. Independently assembling the stator components in this manner facilitates varying a thickness and/or the number of heat conducting laminations between the yoke and teeth that subsequently facilitates heat transfer from the armature winding to an outer pressure casing of the machine.
    Type: Grant
    Filed: August 21, 2009
    Date of Patent: August 3, 2010
    Assignee: General Electric Company
    Inventors: Christopher Anthony Kaminski, Blake Weldon Wilson, James Michael Fogarty, Emil Donald Jarczynski, John Russell Yagielski, Konrad Roman Weeber
  • Patent number: 7719151
    Abstract: An active magnetic bearing (100) with autodetection of position, the bearing comprising at least first and second opposing electromagnets (120, 130) forming stators disposed on either side of a ferromagnetic body (110) forming a rotor and held without contact between said electromagnets. The first and second electromagnets (120, 130) each comprising a magnetic circuit (121; 131) essentially constituted by a first ferromagnetic material and co-operating with said ferromagnetic body to define an airgap, together with an excitation coil (122; 132) powered from a power amplifier whose input current is servo-controlled as a function of the position of the ferromagnetic body relative to the magnetic circuits of the first and second electromagnets.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: May 18, 2010
    Assignee: Societe de Mecanique Magnetique
    Inventors: Yann Tremaudant, Maurice Brunet, Ulrich Schroeder