Interfitting Or Claw-tooth Stators Patents (Class 310/257)
  • Patent number: 10411528
    Abstract: A motor is formed by stacking a plurality of stator elements and does not need an insulator between the stator elements. A stator includes the plurality of stator elements. The stator element includes a plurality of claw poles formed along a circumferential direction of the stator element and a coil wound in the circumferential direction. The coils of mutually adjacent stator elements are wound in different directions. In the mutually adjacent stator elements, the claw poles of one of the stator elements and the claw poles of the other of the stator elements are opposite to each other and are arranged to have the same polarity.
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: September 10, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Katsuhisa Mukai, Toshiki Tatsuya
  • Patent number: 10267692
    Abstract: A torque sensing apparatus comprises: a first casing comprising a first opening; a second casing comprising a second opening; a stator comprising a stator holder that is placed in the interior of the first casing and the second casing and at least one stator tooth that is secured to the stator holder; and a rotor that is rotatably disposed in the stator, wherein the stator comprises a protrusion facing the inner peripheral surface of the first opening.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: April 23, 2019
    Assignee: LG INNOTEK CO., LTD.
    Inventor: Ho Chan Son
  • Patent number: 10247827
    Abstract: Optical apparatus (64) includes a stator assembly (47), which includes a core (78, 90, 91) containing an air gap and one or more coils (80, 92, 94, 116, 120) including conductive wire wound on the core so as to cause the core to form a magnetic circuit through the air gap in response to an electrical current flowing in the conductive wire. A scanning mirror assembly (45, 83, 85, 130) includes a support structure (68), a base (72), which is mounted to rotate about a first axis relative to the support structure, and a mirror (46), which is mounted to rotate about a second axis relative to the base. At least one rotor (76, 132) includes one or more permanent magnets, which are fixed to the scanning mirror assembly and which are positioned in the air gap so as to move in response to the magnetic circuit. A driver (82) is coupled to generate the electrical current in the one or more coils.
    Type: Grant
    Filed: June 7, 2018
    Date of Patent: April 2, 2019
    Assignee: APPLE INC.
    Inventors: Alexander Sromin, Naftali Chayat, Raviv Erlich, Yuval Gerson, Alexander Shpunt, Raviv Weber
  • Patent number: 10250112
    Abstract: The invention implements a variation of the electrical transverse flux machine (motor or generator) that employs ferromagnetic excitation elements mostly located on the stator rather on the rotor. The excitation elements are employed in nearly-complete magnetic circuits that are periodically completed by the movement of the rotor. The varying flux that is thus generated is used to cause an EMF in windings, for the case of generators, or for the case of motors, appropriate EMF is used to cause varying flux that in turn causes rotation of the motor.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: April 2, 2019
    Assignee: EKORAD LTD.
    Inventor: Alexander Radovsky
  • Patent number: 9985510
    Abstract: A PM stepping motor includes a two-phase stator which includes first and stator stators, and a rotor which is rotatably supported inside the two-phase stator. Each of the first and second stators includes an outer yoke, an inner yoke and a coil. Each of the first and second stators is formed with a convex portion and a concave portion. The convex portion formed on the inner yoke of the first stator is engaged with the concave portion formed on the inner yoke of the second stator. The inner yoke is formed with two protrusions engaged with a cutout of the outer yoke. The convex portion and the concave portion are arranged line-symmetrically with respect to a center line passing through a center point of the inner yoke and a center position between the two protrusions, and an angle ? between each position and the center line ranges 30°<?<90°.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: May 29, 2018
    Assignee: Minebea Co., Ltd.
    Inventors: Koji Kebukawa, Yan Zhong
  • Patent number: 9819251
    Abstract: Provided is a resin sealing method of a motor core having a rotor core and a stator core formed in such a way that a plurality of iron core pieces is laminated. The resin sealing method includes pressing the rotor core and the stator core from a direction of lamination by using a set of an upper die and a lower die, then extruding a resin stored in a resin reservoir pot provided in one or both of the upper die and the lower die by using a plunger and allowing a magnet-insert hole formed in the direction of lamination of the rotor core and a connection hole formed in the direction of lamination of the stator core to be filled with the resin and harden the resin.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: November 14, 2017
    Assignee: MITSUI HIGH-TEC, INC.
    Inventor: Hirotoshi Mabu
  • Patent number: 9771902
    Abstract: An EGR device includes a housing having an outer pipe and an inner pipe. The inner pipe is accommodated in the outer pipe to define an annular passage externally with the outer pipe. The inner pipe defines an inner passage internally. The inner pipe has pipe through holes. A rotary valve is accommodated in the inner pipe. The rotary valve has valve through holes. The rotary valve is rotatable to communicate the annular passage with the inner passage through the valve through holes and the pipe through holes. The rotary valve is rotatable to block the inner passage from the annular passage.
    Type: Grant
    Filed: December 5, 2014
    Date of Patent: September 26, 2017
    Assignee: DENSO International America, Inc.
    Inventors: Nicholas Polcyn, Jonathan Logan, Dallas Smolarek
  • Patent number: 9705391
    Abstract: A stepping motor includes a rotor having a rotor magnet fixed to a rotating shaft, a plurality of coil bobbins where coils are wound, a stator yoke group having a plurality of stator yokes each of which surrounds each of the plurality of coil bobbins in an axial direction and a radial direction of the rotating shaft, and the plurality of stator yokes each having pole teeth alternately arranged in a circumferential direction around the rotating shaft so as to be opposed to a side surface of the rotor magnet, and a magnetic attractive force generating member configured to attract the rotor magnet to the axial direction of the rotating shaft by a magnetic attractive force, and a magnetic center of the rotor magnet and a magnetic center of the stator yoke group coincide with each other.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: July 11, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Kota Asano
  • Patent number: 9698633
    Abstract: A transducer contains a rotor, on which permanent magnets are arranged in a concentrically radiant manner, and two stators are provided at both sides of the rotor. The stators are produced from a soft-magnetic material. Each stator contains a first stator section with radially outer supporting bars for first magnetic active faces of the stator being opposite the rotor and a second stator section with radial inner supporting bars for second magnetic active faces of the stators being opposite the rotor. An annular winding groove for receiving a winding is provided between the stator sections. Supporting bars are each arranged in an annular manner and each extend parallel to the rotor axis in the direction of the rotor. The magnetic active faces of the stators are end faces of projections which are uniformly spaced to one another and which protrude from the supporting bars in the direction of the rotor.
    Type: Grant
    Filed: August 30, 2013
    Date of Patent: July 4, 2017
    Assignee: Leantec Motor GmbH
    Inventors: Rainer Lenz, Torsten Keller, Sven Schmidt, Thomas Bartsch, Philip Hennig, Erik Braune, Maik Hohmuth
  • Patent number: 9644704
    Abstract: An actuator (10) has a casing (12) and an output (16). An electric motor (20) is disposed in a compartment (18) of the casing (12). The output (16) is driven by the motor (20) through a gear train disposed within the casing (12). The gear train includes a worm (30) on a shaft (22) of the motor (20) and a worm wheel (32) meshed with the worm (30). A mounting clip (40) is arranged to resiliently press the motor (20) into the compartment 18). The mounting clip (40) has fingers (44) which engage axial ends of the motor (20) to support the motor (20) against axial movement and separation due to axial loading and/or external vibrations acting on the actuator (10).
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: May 9, 2017
    Assignee: Johnson Electric S.A.
    Inventors: Rolf Weber, Michael Watzek, Bruno Neuhaus, Yvan Bourqui
  • Patent number: 9559558
    Abstract: A modular stator portion adapted to be used in a transverse flux electrical machine (TFEM) includes a plurality of phase modules adapted to be axially secured together with a plurality of securing members. The phase modules of at least en embodiment thereof are substantially identical and interchangeable. Each pair of axially adjacent phase modules are adapted to be angularly located in respect with each other to set a phase shift. A phase module and a kit of phase modules sized and designed to assemble a modular stator are also encompassed by the present application.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: January 31, 2017
    Assignee: EOCYCLE TECHNOLOGIES INC.
    Inventors: Raphael Nadeau, Daniel Massicotte, Eric Adams, Simon Cote, Patrice Fortin, Jean-Francois Bernier-Synnott
  • Patent number: 9337710
    Abstract: A homopolar motor phase (d4) which consists of a wafer (a0), the leg (a3) of each tooth meeting the leg of the next tooth before touching the cylinder head (a4), the leg (a3) at least partially filling the space (a6) between the teeth. The inner diameter (a11) is reduced by the presence of a discontinuity in the area (a7) at the tip of the tooth (a5).
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: May 10, 2016
    Assignee: SINTERTECH
    Inventors: François Bernot, Alix Bernot
  • Patent number: 9331529
    Abstract: An actuator includes: a coil; a permanent magnet rotor secured to and rotatably supported by an output shaft inside the coil; a bobbin made of a non-magnetic material and around which the coil is wound; a first stator inserted into and secured to the bobbin in one direction, and including an inner magnetic pole portion and an outer magnetic pole portion extending inside and outside the coil in an axial direction of the rotor, respectively; and a second stator inserted into and secured to the bobbin in a direction opposite to the one direction, and including an inner magnetic pole portion and an outer magnetic pole portion extending inside and outside the coil in the axial direction of the rotor, respectively.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: May 3, 2016
    Assignee: SEIKO PRECISION INC.
    Inventors: Masami Yamamoto, Kenichi Kudo
  • Patent number: 9124152
    Abstract: A permanent magnet motor has a rotor and a stator. The rotor has a shaft, a rotor core and commutator fixed to the shaft, and rotor windings wound about poles of the rotor core and electrically connected to the commutator. The stator has an axially extending round housing, a ring magnet member fixed to an inner surface of the round housing, an endcap, and at least one pair of brushes in sliding contact with the commutator. A chamber is formed by the housing and the endcap. The commutator is disposed in the chamber. A window lift device incorporating the motor is also provided.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: September 1, 2015
    Assignee: Johnson Electric S.A.
    Inventors: Mao Xiong Jiang, Yue Li, Jian Zhao, Hong Min Wei, Ke Lin Zhou, Xing Zhang
  • Patent number: 9075369
    Abstract: An apparatus includes an image formation unit including a photosensitive drum and a motor for driving the image formation unit. The apparatus acquires a frequency generator signal, which is phase information output from the motor as the motor rotates. In addition, the apparatus corrects unevenness of the density that may occur due to the rotation of the motor according to the acquired phase information.
    Type: Grant
    Filed: June 11, 2013
    Date of Patent: July 7, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takayuki Fukutani, Yuuji Takayama, Tomoyuki Saiki, Tae Matsumoto, Yuichi Ogawa
  • Publication number: 20150048708
    Abstract: A stator for an electric machine, the stator including a stator core and a winding. The stator core including an annular stator core back component providing a magnetic flux path in a circumferential direction and in an axial direction of the annular stator core back component; and a plurality of stator pole components each including a mounting part mounted to the stator core back component, an interface part defining an interface surface facing an active air gap between the stator and a rotor of the electrical machine; and a radially oriented tooth part extending radially from the annular stator core component and connecting the interface part with the mounting part.
    Type: Application
    Filed: March 8, 2013
    Publication date: February 19, 2015
    Inventors: Göran Nord, Jamie Washington
  • Publication number: 20150015092
    Abstract: An electric machine, especially a transversal flux machine, the stator being composed of a stack of phase segments, each phase segment having at least one stator segment and one stator winding, especially a single winding, each stator segment having an annular stator bridge, on which pole shoes are premolded, which in particular extend radially inward, and/or which extend in the direction of the rotor and/or which are situated between the rotor and the annular stator bridge, the pole shoes having the same shape, in particular, the axial width of the pole shoe decreasing with increasing radial clearance, the associated profile being disposed between a first and a second profile, the first profile being a linear function of the radial clearance, the pole back associated with the first profile being a planar area, in particular, the second profile being a circular function, in particular a circular segment function, the pole back associated with the second profile being a cylindrical section area, in particular.
    Type: Application
    Filed: January 21, 2013
    Publication date: January 15, 2015
    Inventor: Florian Dreher
  • Publication number: 20140191612
    Abstract: The present invention relates to an electric machine (1) that includes a stator (10) and a rotor (20), with the said stator (10) being equipped with at least one annular exciter unit (11) that includes a coil (12) and at least two annular yokes (13a, 13b), with the said rotor being equipped with a structure (21) and at least one annular receiver unit (22). Each receiver unit (22) includes at least two rows (24) of magnets (23). Two sides (131, 132) of each yoke (13) include teeth (14) distributed angularly in a regular manner, and the said teeth (14) of the two adjacent yokes (13) fit onto a face (121) of the said exciter unit (11), alternately forming north poles and south poles.
    Type: Application
    Filed: January 6, 2014
    Publication date: July 10, 2014
    Applicants: EUROCOPTER, MBDA FRANCE, SINTERTECH
    Inventor: Damien Mariotto
  • Publication number: 20140191613
    Abstract: The present invention relates to an electric machine (1) consisting of a stator (10) that is provided with at least one exciter unit (11) consisting of a coil (12), at least two annular yokes (13a,13b) and at least one row of intermediate pieces (15), and a rotor (20) having a structure (21) and at least one receiver unit (22) consisting of at least two series (25) of at least two rows (24) of magnets (23). Two sides (131,132) of each yoke (13) consist of the first teeth (14), fitting with the said intermediate pieces (15) on a face (121) of the said exciter unit (11) and alternatingly forming the second north poles and the second south poles. Each series (23) is positioned opposite one face (121), forming an air gap (30) with the said exciter unit (11), with the electric machine (1) thus including at least two air gaps (30), with a flux F thus circulating inside the said electric machine (1), dividing and regrouping itself in the vicinity of the said magnets (23) and of the said yokes (13).
    Type: Application
    Filed: January 6, 2014
    Publication date: July 10, 2014
    Applicants: EUROCOPTER, MBDA FRANCE, SINTERTECH
    Inventor: Damien Mariotto
  • Patent number: 8760029
    Abstract: A rotary electric machine having a stator whose dismantled structure can be reintegrated at reduced cost. The stator eliminates difficulties in separation and reuse at the time of disposal incident to use of molding such as resin molding. Also, it has no adverse environmental impacts. A plurality of stator cores having a plurality of magnetic poles arranged at intervals in the circumferential direction are laminated in the axial direction with use of a heat-shrinkable tube having an appropriate compression retention force. The outer circumferences of these stator cores are covered collectively with another heat-shrinkable tube. The heat-shrinkable tubes are heated so that the plurality of stator cores are integrated into a single-piece structure by the heat-shrunk tubes.
    Type: Grant
    Filed: October 6, 2008
    Date of Patent: June 24, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Hideaki Nagashima, Shuichi Ishizawa, Yuji Enomoto
  • Patent number: 8674649
    Abstract: A high acceleration rotary actuator motor assembly is provided comprising a plurality of phase motor elements provided in tandem on a shaft, each phase element including a rotor carrying magnets which alternate exposed poles, the rotor being connected to the shaft and surrounded by a stator formed of a plurality of interconnected segmented stator elements having a contiguous winding to form four magnetic poles, the stator being in electrical communication with a phase electric drive unit, wherein each of the poles exert a magnetic force upon the magnets carried by the rotor when the poles are electrically charged by the phase electric drive unit. The rotors and magnets of each phase motor element are offset about the shaft from one another. In addition, the phase motor elements are electrically isolated from one another.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: March 18, 2014
    Inventor: Gerald K. Langreck
  • Publication number: 20140028134
    Abstract: An actuator includes: a coil; a permanent magnet rotor secured to and rotatably supported by an output shaft inside the coil; a bobbin made of a non-magnetic material and around which the coil is wound; a first stator inserted into and secured to the bobbin in one direction, and including an inner magnetic pole portion and an outer magnetic pole portion extending inside and outside the coil in an axial direction of the rotor, respectively; and a second stator inserted into and secured to the bobbin in a direction opposite to the one direction, and including an inner magnetic pole portion and an outer magnetic pole portion extending inside and outside the coil in the axial direction of the rotor, respectively.
    Type: Application
    Filed: October 2, 2013
    Publication date: January 30, 2014
    Applicant: Seiko Precision Inc.
    Inventors: Masami YAMAMOTO, Kenichi KUDO
  • Patent number: 8624458
    Abstract: An electrical, rotary machine may include a first stator core section being substantially circular and including a plurality of teeth, a second stator core section being substantially circular and including a plurality of teeth, a coil arranged between the first and second circular stator core sections, and a rotor including a plurality of permanent magnets. The first stator core section, the second stator core section, the coil and the rotor are encircling a common geometric axis, and the plurality of teeth of the first stator core section and the second stator core section are arranged to protrude towards the rotor. Additionally the teeth of the second stator core section are circumferentially displaced in relation to the teeth of the first stator core section, and the permanent magnets in the rotor are separated in the circumferential direction from each other by axially extending pole sections made from soft magnetic material.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: January 7, 2014
    Assignee: Hoganas AB (Publ)
    Inventors: Alan Jack, Edwin Pinguey, Goran Nord
  • Publication number: 20130320802
    Abstract: A claw-pole motor for driving a centrifugal pump; consisting of stator laminations in the form of annular discs with claw poles adjoining said stator laminations, which claw poles are arranged opposite permanent-magnet poles of a rotor, a ring-shaped winding and an insulating body, which is arranged between the stator laminations and the winding, and a magnetic return path ring, which is arranged radially around the winding and the stator laminations and bears fixedly against the stator laminations.
    Type: Application
    Filed: January 27, 2012
    Publication date: December 5, 2013
    Applicant: BÜHLER MOTOR GMBH
    Inventors: Olai Ihle, Klaus Weiske
  • Publication number: 20130270928
    Abstract: A stator core section for a stator of a modulated pole machine, the modulated pole machine including the stator, a moving device, and an active gap between respective interface surfaces of the moving device and the stator for communicating magnetic flux between the stator and the moving device, the moving device being adapted to move relative to the stator in a direction of motion, wherein the stator core section includes a stator core back from which a plurality of teeth extend, each tooth extending in a respective first direction defining a direction towards the rotor, the teeth being arranged along a second direction defining the direction of motion, each tooth having at least one side wall facing a neighbouring tooth and an interface surface facing the active gap, the interface surface and the side wall forming an edge connecting the interface surface and the side wall.
    Type: Application
    Filed: December 20, 2011
    Publication date: October 17, 2013
    Applicant: HÕGANÃS AB (PUBL)
    Inventor: Göran Nord
  • Patent number: 8497647
    Abstract: A control system and method for a multi-phase motor substantially reduces or eliminates jitter resulting from. drive mismatch by replacing a conventional trapezoidal drive profile with a drive profile that causes the voltage applied across active phases of the motor to match the back-EMF across those phases. In an ideal motor, the back-EMF is substantially sinusoidal, and although the drive profile applied to each phase is not truly substantially sinusoidal, the drive voltage across the active phases is substantially sinusoidal. In a non-ideal motor, the back-EMF is not truly sinusoidal and the drive profiles applied to each phase are calculated to cause the drive voltage across the active phases to match the back-EMF across those phases.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: July 30, 2013
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Patent number: 8482243
    Abstract: A high acceleration rotary actuator motor assembly is provided comprising a plurality of phase motor elements provided in tandem on a shaft, each phase element including a rotor carrying magnets which alternate exposed poles, the rotor being connected to the shaft and surrounded by a stator formed of a plurality of interconnected segmented stator elements having a contiguous winding to form four magnetic poles, the stator being in electrical communication with a phase electric drive unit, wherein each of the poles exert a magnetic force upon the magnets carried by the rotor when the poles are electrically charged by the phase electric drive unit. The rotors and magnets of each phase motor element are offset about the shaft from one another. In addition, the phase motor elements are electrically isolated from one another.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: July 9, 2013
    Inventor: Gerald K. Langreck
  • Patent number: 8471423
    Abstract: A rotary machine including two coaxial parts, the first part including an intermediate part, an energizing coil, and fingers distributed around the circumference of the intermediate part with a constant finger pitch and directed alternately in opposite directions. The fingers are positioned so as to interlace over part of the coil. The second part includes a permanent magnet and two lateral parts mounted substantially coaxially, the lateral parts being secured to the permanent magnetic part so as to have opposite polarities, the lateral parts including protrusions distributed around the circumference of the lateral parts and arranged in alternation on one and the other of the lateral parts with a protrusion pitch substantially equal to the finger pitch. A control device can be equipped with such a rotary machine.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: June 25, 2013
    Assignee: Schneider Electric Industries SAS
    Inventors: Christophe Cartier Millon, Benoit Froidurot
  • Patent number: 8461733
    Abstract: A dynamoelectric machine main body that includes: a housing that is constituted by a rear bracket and a front bracket; a rotor; a stator; and a fan, and a power supply unit that is mounted integrally onto the dynamoelectric machine main body are included, the power supply unit is disposed between the fan and a bottom portion of the rear bracket, and the power supply unit is disposed between the fan and a bottom portion of the rear bracket, and the rear bracket has: air discharge ports that are formed on portions that are positioned radially outside the fan; and air suction ports that have openings nearer to a bottom portion than the power supply unit, and includes a partitioning member for configuring a ventilation channel that extends from the air suction ports to the air discharge ports that is disposed between the power supply unit and the fan.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: June 11, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Takechi, Dai Nakajima, Hitoshi Isoda, Masahiko Fujita
  • Patent number: 8446063
    Abstract: A claw-pole-type stepping motor includes a stator annularly disposed therein and having a coil, a rotor rotatably disposed inside the stator and having a multiply magnetized permanent magnet and a shaft, an outer yoke provided in the stator and having a cup shape opening toward an axially outside direction an outer circumferential portion provided in the outer yoke and having a cylindrical shape and an inner circumferential portion including first pole teeth, an inner yoke provided in the stator and having second pole teeth provided in an inner circumference thereof and an outer circumferential portion fixed to an inner circumferential surface of the outer circumferential portion of the outer yoke, in which the first pole teeth and the second pole teeth are engaging with each other via a gap in an axial direction and are disposed with respect to the permanent magnet of the rotor via a gap, a fixed portion of the inner yoke and the outer yoke is positioned at the axial inside of an opening end of the cup shape
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: May 21, 2013
    Assignee: Minebea Co., Ltd.
    Inventors: Shuhei Kinpara, Yuzuru Suzuki, Seiya Fujimoto
  • Patent number: 8398384
    Abstract: A rotary pump with a plastic pump housing, that can be processed by injection molding, with a first housing part defining a pump space, which is connected to a second intermediate housing part accommodating an electric motor with a wound core stator. The rotary pump includes a plastic split core, the wound claw pole stator being mounted on the split core and a permanent magnetic rotor being mounted to rotate within the split core. A plastic motor housing part defines a motor space, wherein at least three axial and parallel split core ribs are provided between the split core and the claw pole stator, the ribs being distributed about the periphery of the split core at predetermined angles relative to each other. A return ring has first and second end sections, the return ring being connected to the wound claw pole stator, so that the first and second end sections are welded to each other. The stator is press-fit onto the split core via the ribs.
    Type: Grant
    Filed: October 23, 2009
    Date of Patent: March 19, 2013
    Assignee: Bühler Motor GmbH
    Inventors: Thomas Peterreins, Achim Brunner, Bernd Frühwald, Armin Suttner-Reimann, Ramona Kiesel, Gerd Pecher, Christian Schatz, Ingrid Späth
  • Patent number: 8390168
    Abstract: A permanent magnet-less, brushless synchronous system includes a stator that generates a magnetic rotating field when sourced by an alternating current. An uncluttered rotor disposed within the magnetic rotating field is spaced apart from the stator to form an air gap relative to an axis of rotation. A stationary excitation core spaced apart from the uncluttered rotor by an axial air gap and a radial air gap substantially encloses the stationary excitation core. Some permanent magnet-less, brushless synchronous systems include stator core gaps to reduce axial flux flow. Some permanent magnet-less, brushless synchronous systems include an uncluttered rotor coupled to outer laminations. The quadrature-axis inductance may be increased in some synchronous systems. Some synchronous systems convert energy such as mechanical energy into electrical energy (e.g., a generator); other synchronous systems may convert any form of energy into mechanical energy (e.g., a motor).
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: March 5, 2013
    Assignee: UT-Battelle, LLC
    Inventor: John S. Hsu
  • Patent number: 8378545
    Abstract: An electrical rotary machine is provided comprising a first stator core section being substantially circular and including a plurality of teeth, a second stator core section being substantially circular and including a plurality of teeth, a coil arranged between the first and second circular stator core sections, and a rotor including a plurality of permanent magnets. The first stator core section, the second stator core section, the coil and the rotor are encircling a common geometric axis, and the plurality of teeth of the first stator core section and the second stator core section are arranged to protrude towards the rotor. Additionally, the teeth of the second stator core section are circumferentially displaced in relation to the teeth of the first stator core section, and the permanent magnets in the rotor are separated in the circumferential direction from each other by axially extending pole sections made from soft magnetic material.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: February 19, 2013
    Assignee: Hoganas AB (Publ)
    Inventors: Alan Jack, Edwin Pinguey, Göran Nord
  • Patent number: 8354767
    Abstract: A permanent magnet machine is provided comprising a stator and a rotor, the rotor being adapted to rotate relative to the stator, the rotor comprising a plurality of permanent magnets separated in the circumferential direction from each other by axially extending rotor pole pieces for concentrating the magnetic flux from the permanent magnets, the stator having a structure that defines axial limits of an air gap between the stator and the rotor for communicating magnetic flux between the stator and the rotor, wherein that at least some of the permanent magnets extend axially outside the axial limits of the air gap as defined by the stator structure.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: January 15, 2013
    Assignee: Hoganas AB (Publ.)
    Inventors: Lars-Olov Pennander, Alan G. Jack, Glynn James Atkinson
  • Patent number: 8319392
    Abstract: A motor may include a stator provided with a yoke having a plurality of pole teeth and an exciting coil and a rotor disposed in a circular space surrounded by the pole teeth. A portion where a difference between an inner side area of the pole tooth facing the rotor and an outer side area of the pole tooth facing the exciting coil is larger than a difference between the inner side area and the outer side area of the pole tooth where both circumferential direction faces of the pole tooth are formed in faces coincided with normal lines may be provided on a root part of the pole tooth. Further, circumferential direction faces of at least a root part of the pole tooth are formed so as to face the rotor in an inclined manner.
    Type: Grant
    Filed: May 6, 2010
    Date of Patent: November 27, 2012
    Assignee: Nidec Sankyo Corporation
    Inventor: Hisashi Fukuzawa
  • Patent number: 8314581
    Abstract: A control system and method for a multi-phase motor substantially reduces or eliminates jitter resulting from drive mismatch by replacing a conventional trapezoidal drive profile with a drive profile that causes the voltage applied across active phases of the motor to match the back-EMF across those phases. In an ideal motor, the back-EMF is substantially sinusoidal, and although the drive profile applied to each phase is not truly substantially sinusoidal, the drive voltage across the active phases is substantially sinusoidal. In a non-ideal motor, the back-EMF is not truly sinusoidal and the drive profiles applied to each phase are calculated to cause the drive voltage across the active phases to match the back-EMF across those phases.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: November 20, 2012
    Assignee: Marvell International Ltd.
    Inventors: Ravishanker Krishnamoorthy, Foo Leng Leong
  • Patent number: 8304955
    Abstract: A PM stepping motor includes: a stator assembly composed of two stator units which are axially coupled to each other with a molding resin material, and each of which includes: inner and outer yokes each having a plurality of pole teeth; a bobbin including inner and outer flanges; and a coil wound around the bobbin, thus providing two such inner yokes, outer yokes, bobbins and coils in total; a rotor assembly which includes a shaft and a magnet, and which is rotatably disposed in the hollow of the stator assembly; and two bearings to rotatably support the shaft of the rotor assembly, wherein the two bobbins are formed of the molding resin material to be consolidated with the two inner yokes, and wherein a plurality of protrusions are formed of the molding resin material to extend integrally from the outer flange of each of the two bobbins.
    Type: Grant
    Filed: June 13, 2008
    Date of Patent: November 6, 2012
    Assignee: Minebea Co., Ltd.
    Inventors: Yuzuru Suzuki, Takayuki Yamawaki, Hiroyuki Furusaki, Masaki Kagawa
  • Patent number: 8294326
    Abstract: A stator for an electric motor has a laminated stator core 10 formed from a plurality of stacked laminations, and a stator winding formed from a plurality of coils 20 wound on bobbins 30. The stator core 10 has a plurality of teeth 40 which extend radially and alternately spaced between and connected to circumferentially extending yokes 50. The yokes and the teeth are separately formed with each yoke 50 being a stack of yoke laminations 12 and each tooth 40 being a stack of tooth laminations 14. The teeth 40 are inserted through the bobbins 30 and arranged in a cylindrical form with each tooth 40 extending radially. Yokes 50 are then fixed between radially outer ends 144 of adjacent teeth to complete the radially outer portion of the stator core. Each tooth 40 has a radial location surface 144b which contacts an inner surface of the adjacent yokes 50. The yokes 50 and teeth 40 are fixed together by welding the yokes 50 to the outer ends 144 of the teeth 40.
    Type: Grant
    Filed: January 12, 2009
    Date of Patent: October 23, 2012
    Assignee: Johnson Electric S.A.
    Inventors: Ji Dong Chai, Bao Ting Liu, Wen Liang Li, Zhi Duan Shao
  • Patent number: 8288900
    Abstract: A stepping motor includes a rotor assembly and a stator assembly including two stator units axially coupled to each other. The two stator units each include a pair of yokes which each include a base portion and a plurality of pole teeth extending from the base portion and which are disposed such that each of the pole teeth of one yoke and each of the pole teeth of the other yoke are arranged alternately in the circumferential direction. The pole teeth are shaped symmetric and each include a pair of slant sides inclined so as to become closer to each other with an increase of distance from the base portion, and the slant sides of adjacent pole teeth are located close to each other wherein a magnetic pole gap between the adjacent pole teeth pole teeth is about 0.2 times as large as the thickness of the pole teeth.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: October 16, 2012
    Assignee: Minebea Co., Ltd.
    Inventors: Takeshi Matsuno, Yoshiya Yamamura, Hiroaki Itahashi, Shigeki Miyaji, Yukihiro Terada
  • Patent number: 8274194
    Abstract: In the drive train of a combustion engine an auxiliary arrangement is arranged which is to be coupled with an axial flow machine including a stator and a rotor, in order to perform an actuating movement. The stator has a coil arrangement, and the rotor has an essentially cup-shaped support for permanent magnet elements. The coil arrangement of the stator has at least one cylindrical winding and is at least partially enclosed by two essentially pot-shaped magnetic flux yokes. Each of the pot-shaped magnetic flux yokes has side areas with magnetic flux poles whose outsides are oriented towards the permanent magnet elements of the rotor. The magnetic flux poles of the stator are arranged spaced apart from the permanent magnet elements of the rotor. The magnetic orientation of neighboring permanent magnet elements towards the air gap alternates.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: September 25, 2012
    Assignee: Compact Dynamics GmbH
    Inventors: Andreas Gruendl, Bernhard Hoffmann, Stephan Steyer, Anton Wolf, Uwe Reichert
  • Patent number: 8264106
    Abstract: A magnetic-pole portion can be formed by thread cutting, whereby a motor can be provided at lower cost as compared to a case where the magnetic-pole portion is formed by press-working.
    Type: Grant
    Filed: October 24, 2008
    Date of Patent: September 11, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kousuke Kiyamura
  • Patent number: 8253299
    Abstract: A motor including an outside rotor having a rotor disc with plural magnets alternating polarities flush mounted in the disc, an inside stator assembly with a transversely wound stator windings encased by a ring of wound magnetic flux channel pole pieces to assemble within a hub of a motor, and a controller coupled with feedback electronics for monitoring a timing, speed and direction and coupling a signal to a processing unit for adjusting the drive electronics driving the phase windings. A u-shaped channel above the bobbin filed transverse winding coil to receive the rotor disc and focus the captured magnetic flux in the pole pieces toward the magnets.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: August 28, 2012
    Inventor: Norman P. Rittenhouse
  • Patent number: 8183726
    Abstract: Methods, systems and apparatus for an electric motor assist bicycle having a hub motor mounted to the front or rear hub to provide electric motor assist, and to function as a generator to charge batteries. The motor can be either a molded or wound magnetic flux channel transverse wound stator permanent magnet motor. The bicycle hub motor includes an electronic controller mounted to the frame of the bicycle and coupled with feedback electronics for monitoring a timing, speed and direction and coupling a signal to a processing unit for adjusting the drive electronics driving the phase windings. The pedal crank arm housing of the electric motor assist bicycle can include battery access ports with batteries stacked inside the bicycle seat tube and the down tube and a strain gauge to measure the rider pedaling effort and produce a signal in response.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: May 22, 2012
    Inventor: Norman Rittenhouse
  • Patent number: 8179015
    Abstract: An interfitting groove is disposed in a bottom portion of a trough portion so as to have a groove direction that is axial and so as to extend axially outward from axially inside, and a rotation arresting portion housing recess portion is recessed into an axially inner opening edge portion of the interfitting groove on a first yoke portion. A magnet holding seat that holds a permanent magnet is disposed in the trough portion by an interfitting portion being fitted into the interfitting groove such that radial movement is restricted. A rotation arresting portion that is disposed so as to project axially outward from a flange portion of the bobbin is housed inside a space that is constituted by the rotation arresting portion housing recess portion and an external shape reduced portion that extends axially inward from the interfitting groove such that rotation of the bobbin around the shaft is restricted.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: May 15, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Ken Nishikawa, Kazunori Tanaka
  • Patent number: 8148871
    Abstract: Disclosed is a structure of a casing of a small stepping motor having an outer diameter of 8 mm or less, in which yoke teeth are integrally formed on the inner surface of the casing, and the thickness of the outer wall of the casing is different from the thickness of each of the yoke teeth. The casing of a small stepping motor includes yoke teeth integrally formed on an inner surface of the casing, in which a thickness of an outer wall of the casing is different from a thickness of the yoke tooth.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: April 3, 2012
    Assignee: Moatech Co., Ltd
    Inventors: Dong Hwan Oh, Heung Jai Won
  • Patent number: 8125116
    Abstract: An alternator for vehicle includes a stator that outputs an AC voltage and a rotor that includes a field coil and a rotor core. The stator includes a plurality of phase stators that are disposed side-by-side along the rotational axis and individually output AC voltages. The phase stators include an even number of stator tabs alternately extending from one outer side of a phase stator coil toward another outer side of the phase stator coil and extending from the other outer side toward the one outer side along the rotational axis. The rotor includes a field coil and a rotor core at which an even number of rotor tabs are formed along the circumferential direction so as to alternately extend from one outer side of the field coil toward another outer side of the field coil along the rotational axis and extend from the other outer side toward the one outer side along the rotational axis. A phase stator core at each phase stator is formed by laminating a plurality of magnetic sheets.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: February 28, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Toshio Ishikawa, Minoru Yabuki, Yoshihisa Ishikawa, Yuji Enomoto
  • Publication number: 20120038301
    Abstract: Provided is an AC motor in a three-phase unbalanced state such as a claw-teeth type AC motor (108), which is reduced in magnetic flux pulsations and torque pulsations. Among the current command values of individual phases to be intrinsically given to an inverter (106) for feeding three-phase alternating currents of variable voltages/frequencies to the electric motor, a current command of an intermediate phase (a V-phase) having a smaller magnetic resistance of a stator core than those of other phases is subjected to a reducing correction by a correction unit (102) on the basis of the correction amount calculated by a current correction amount calculating unit (103), and the unbalanced three-phase alternating currents are fed to the AC motor (108), so that magnetic flux pulsations of a secondary electric angle and torque pulsations of the same order are reduced.
    Type: Application
    Filed: April 16, 2009
    Publication date: February 16, 2012
    Applicant: Hitachi Ltd
    Inventors: Norihisa Iwasaki, Junnosuke Nakatsugawa, Yoshitaka Iwaji
  • Patent number: 8093771
    Abstract: A power-generating wheel hub includes a hub shaft including a mounting section, and a bobbin including a tubular body sleeved around the mounting section, two flange plates connected respectively to two opposite ends of the tubular body, and a coil wound around the tubular body. Two magnetic yoke disks are sleeved on the mounting section adjacent respectively to outer faces of the flange plates, and each includes a plurality of angularly spaced-apart radial protrusions, and a plurality of indentations each formed between two adjacent ones of the radial protrusions. The indentations in the two magnetic yoke disks are staggered axially with respect to each other. Magnetic yoke claws respectively include radial arms inserted respectively into the indentations in the magnetic yoke disks and abutting against the outer faces of the flange plates, and axial arms extending axially from the respective radial arms and arranged annularly around the coil.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: January 10, 2012
    Inventors: Kuei-Tang Liao, Hubert Chen
  • Publication number: 20110241476
    Abstract: A wound stator includes a plurality of windings, each winding including a primary lead and a secondary lead defined by free ends of the winding. Each of the windings being associated with a first, second or third phase. For each phase, a plurality of the primary leads are wrapped around a termination side of the stator to a common primary base lead to form a primary lead connection for the phase. For each phase, a plurality of the secondary leads are wrapped around the termination side of the stator to a common secondary base lead to form a secondary lead connection for the phase.
    Type: Application
    Filed: March 30, 2011
    Publication date: October 6, 2011
    Applicant: Globe Motors, Inc.
    Inventors: Jerry C. Burch, Scott P. Kreger
  • Patent number: 7994676
    Abstract: A rotor is adapted to be used in a reluctance motor configured to generate a magnetic field around the rotor to form magnetic circuits passing through the rotor to produce a driving force corresponding to a torque generated by changes in magnetic reluctance in the magnetic circuits. The rotor includes a first salient pole group and a second salient pole group. The first salient pole group includes a plurality of first salient poles configured and arranged to be energized simultaneously with the first salient poles being spaced apart from each other in a circumferential direction of the rotor. The second salient pole group includes a plurality of second salient poles configured and arranged to be energized simultaneously with the second salient poles being spaced apart from each other in the circumferential direction of the rotor. The first salient pole group is magnetically insulated from the second salient pole group.
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: August 9, 2011
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoya Imazu, Tsutomu Tanimoto