Permanent Magnet Rotor Patents (Class 310/156.01)
  • Patent number: 10778054
    Abstract: The present disclosure relates to an electric drive motor (101; 201) for a vehicle. The electric drive motor (101; 201) has a stator (103) having a plurality of slots (107); and a rotor (102; 202) having a plurality of poles (106; 206). The poles (106; 206) each have at least a first permanent magnet (104; 204) centred on a d-axis of the pole (106; 206); and a plurality of flux barriers (109; 209) for disrupting at least an n-th order torque harmonic of the electric drive motor (101). Proximal to an outer surface of the rotor (102; 202), a first angular period (x11) between first and secondary flux barriers is defined by the equation (xi1=tao/n1), whereby: (xi1) is the first angular period; (tao) is the pole step; and n1 is an order number of a torque harmonic to be disrupted.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: September 15, 2020
    Assignee: JAGUAR LAND ROVER LIMITED
    Inventors: Jose Soler, Alexandros Michaelides, Istvan Kiraly
  • Patent number: 10763715
    Abstract: A rotor assembly with a rotor hub, a plurality of permanent magnets positioned circumferentially around at least a portion of the rotor hub, and a coating on at least a portion of the plurality of permanent magnets. The coating forming a retaining band that circumferentially extends around the rotor hub and the plurality of permanent magnets. The coating includes a nano-crystalline layer including a metal or metal alloy and defines an average grain size of less than about 50 nanometers (nm).
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: September 1, 2020
    Assignees: Rolls Royce North American Technologies, Inc., Rolls Royce PLC
    Inventors: David Loder, Ellis Fui Hen Chong, Edward Claude Rice
  • Patent number: 10749391
    Abstract: A rotor includes a unitary, single material substrate defining a rotor lamination having pockets defining legs and configured to contain permanent magnets therein to establish a magnetic pole of the rotor. The rotor includes a first region having a predefined magnetic permeability. The rotor includes a second region defined between the legs and an outer periphery of the lamination. The second region has a magnetic permeability less than the first region to reduce torque ripple of a predetermined harmonic order.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: August 18, 2020
    Assignee: Ford Global Technologies, LLC
    Inventors: Michael W. Degner, Feng Liang, Lusu Guo, Leyi Zhu
  • Patent number: 10714994
    Abstract: A rotor includes a first slot, a second slot, a first flux barrier, and a second flux barrier. As viewed in a direction of the rotation axis of a rotor core, the substantially rectangular first and second slots are provided in a V-shape pattern. As viewed in the rotation axis direction of the rotor core, the first flux barrier is provided between first and second contact parts, and protrudes toward the outer circumference side from the outer circumferential short side of each of the first and second slots. As viewed in the rotation axis of the rotor core, an outer circumferential wall of the second flux barrier is continuous with the first contact part, and the second flux barrier protrudes from an inner long side of each of the first and second slots.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: July 14, 2020
    Assignee: FANUC CORPORATION
    Inventor: Akihiro Hosoda
  • Patent number: 10714995
    Abstract: A rotor for a rotary electric machine, the rotor including a rotor core that has a magnet hole; a permanent magnet inserted into the magnet hole; and an adhesive layer provided between the permanent magnet and a wall surface of the magnet hole and including a plurality of capsule bodies therein, the adhesive layer fixing the permanent magnet to the wall surface of the magnet hole, wherein the adhesive layer is provided only on a wall surface of the magnet hole on a first side, which is one of a wall surface of the magnet hole on an inner side in a radial direction and a wall surface on an outer side in the radial direction.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: July 14, 2020
    Assignee: AISIN AW CO., LTD.
    Inventors: Yoshihisa Yamamoto, Yoshinari Nakagawa, Yasunari Furuta, Shinya Katayama
  • Patent number: 10707707
    Abstract: A vehicle may include an electric machine. The electric machine may include a stator surrounding sections stacked to form a rotor. Each of the sections may have nested pairs of permanent magnets radially spaced from a rotational axis of the rotor. Corresponding pairs of permanent magnets of each of the sections may be aligned along a direction of the rotational axis. Corresponding chambers adjacent to the permanent magnets may have different shapes such that corresponding pole arc angles are different.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: July 7, 2020
    Assignee: Ford Global Technologies, LLC
    Inventor: Chun Tang
  • Patent number: 10706111
    Abstract: Disclosed herein is an electronic device with multiple independently functional components capable of sharing information through a connector channel that in one embodiment is worn on the body of the user with automatic attachment and detachment capability including via external communication or command.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: July 7, 2020
    Assignee: ENORCOM Corporation
    Inventors: Gitty N. Nasserbakht, Mitra Nasserbakht
  • Patent number: 10637320
    Abstract: According to some aspects of the present disclosure, example stator assemblies for three phase dynamoelectric machines and related winding methods are disclosed. An example stator assembly generally includes a non-segmented stator core including a stator yoke and a plurality of teeth. The stator assembly also includes a plurality of coil portions electrically coupled in a delta winding pattern, and including a first coil portion extending around a first one of the plurality of teeth and a second coil portion extending around a second one of the plurality of teeth. The stator assembly further includes a plurality of connection portions including a first connection portion extending between the first coil portion and the second coil portion and electrically coupling the first coil portion and the second coil portion. The first coil portion, the second coil portion and the first connection portion are defined by a continuous length of winding wire.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: April 28, 2020
    Assignee: Emerson Electric Co.
    Inventors: Weirong Wang, Yongyue Yin
  • Patent number: 10541578
    Abstract: A permanent magnet electric machine (PM machine) for a vehicle or other system includes a rotor assembly, fixed permanent magnets, a stator, an actuator, and one or more repositionable/moveable flux-shunting elements. The flux-shunting element is repositioned to control flux at specific operating points of the PM machine. The rotor assembly has a rotor coaxially surrounding and coupled to a rotor shaft. The permanent magnets are mounted to or in the rotor, and the moveable flux-shunting element is positioned between the rotor shaft and a respective one of the permanent magnets. Inboard and outboard ends of each respective permanent magnet may be oriented toward the rotor shaft and stator, respectively. The actuator selectively positions the moveable flux-shunting element at one or more operating points of the PM machine to vary reluctance in a magnetic circuit formed by the stator and rotor assembly.
    Type: Grant
    Filed: January 2, 2018
    Date of Patent: January 21, 2020
    Assignee: GM Global Technology Operations LLC
    Inventors: Shawn H. Swales, Khwaja M. Rahman, Goro Tamai, Craig S. Ross
  • Patent number: 10511212
    Abstract: A motor includes poles P having a remanence Mr of 0.9 T or more, a coercivity HcJ of 0.80 MA/m or more, and a maximum energy product (BH)max of 150 kJ/m3 or more, which sets a center point Pc of the magnetic poles in a circumferential direction on a rotor outer circumferential surface to a maximum thickness tmax, wherein when a line connecting the Pc and a rotational axis center Rc is Pc-Rc, a straight line connecting an arbitrary point Px in the circumferential direction on the rotor outer circumferential surface and the Rc is Px-Rc, an apex angle of the lines Pc-Rc and Px-Rc is ?, a number of pole pairs is Pn, a circumferential direction magnetic pole end is Pe, and a magnetic pole end biasing distance ?LPe of the circumferential direction magnetic pole ends Pe is ?×tmax (? is a coefficient).
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: December 17, 2019
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Fumitoshi Yamashita, Osamu Yamada, Shiho Ohya, Akihiro Yamane
  • Patent number: 10497496
    Abstract: There is provided a rare earth-cobalt permanent magnet containing 23 to 27 wt % R, 3.5 to 5 wt % Cu, 18 to 25 wt % Fe, 1.5 to 3 wt % Zr, and a remainder Co with inevitable impurities, where an element R is a rare earth element at least containing Sm. It has a metal structure including a cell phase (11) containing Sm2Co17 phase and a cell wall (12) surrounding the cell phase (11) and containing SmCo5 phase.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: December 3, 2019
    Assignee: TOKIN CORPORATION
    Inventors: Hiroaki Machida, Teruhiko Fujiwara, Hideyuki Yoshikawa
  • Patent number: 10479190
    Abstract: An electric wheel hub, comprising a wheel hub (1) and an inner ring gear (2). The inner ring gear and the wheel hub are fixed coaxially and rotate synchronously. A drive motor is provided within an inner cavity of the wheel hub. A motor shaft of the drive motor has one end fitting to the inner ring gear via a planetary reduction mechanism, and the other end provided with an electromagnetic braking mechanism. The wheel hub of the present invention has advantages of reducing the weight of a drive wheel, lowering manufacturing costs, etc. Also disclosed is a drive wheel.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: November 19, 2019
    Assignee: ZHEJIANG LINIX MOTOR CO., LTD.
    Inventors: Yuan Li, Jianliang Ge
  • Patent number: 10461589
    Abstract: A magnetic-plate laminated body includes: a laminated part made up of a plurality of laminated soft magnetic ribbons; first and second metal plates that sandwich the laminated part from upper and lower surfaces in a lamination direction of the laminated part; and a fastening mechanism that penetrates the first and second metal plates and the laminated part and fastening the laminated part by the first and second metal plates.
    Type: Grant
    Filed: February 7, 2017
    Date of Patent: October 29, 2019
    Assignees: TOHOKU MAGNET INSTITUTE CO., LTD., PANASONIC CORPORATION
    Inventors: Akihiro Makino, Nobuyuki Nishiyama, Yukio Nishikawa, Tohru Kojima, Takeshi Ogawa
  • Patent number: 10461604
    Abstract: A hollow rotor shaft for a rotor of an electrical machine may include a cylinder barrel closed off by face flanges on both sides. The cylinder barrel may enclose a shaft cavity. A shaft journal may be configured on each face flanges. An inlet may be disposed in one of the shaft journals by way of which a cooling fluid may pass into the shaft cavity and onto an inner surface of the cylinder barrel. A distribution element may be disposed in the shaft cavity. The distribution element may receive the cooling fluid that enters through the inlet, conduct the cooling fluid in a direction of the inner surface of the cylinder barrel by way of a rotation-symmetrical drainage surface, and give off the cooling fluid to the inner surface by way of a mouth region.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: October 29, 2019
    Assignee: THYSSENKRUPP PRESTA TECCENTER AG
    Inventors: Daniel Paul, Christian Kötschau
  • Patent number: 10439459
    Abstract: A rotor core of a rotor includes: a plurality of protrusions formed on at least a step-skew boundary side; and a tubular non-magnetic ring mounted on outer peripheries of a plurality of permanent magnets so as to cover the boundary. The non-magnetic ring includes a plurality of inner diameter bulging portions. Each of the permanent magnets and each of the protrusions are brought into abutment against the corresponding inner diameter bulging portions.
    Type: Grant
    Filed: February 10, 2014
    Date of Patent: October 8, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Toyoaki Udo, Satoru Akutsu, Shusuke Hori, Takanori Ichikawa, Yuji Takizawa
  • Patent number: 10432070
    Abstract: A rotating electric machine includes: a stator having an armature core having slots formed between magnetic pole teeth, and a plurality of coils each of which is wound so as to straddle a plurality of the magnetic pole teeth; and a rotor including a plurality of permanent magnets disposed at certain intervals on an outer peripheral surface of the magnetic yoke, and the coils include an armature coil for driving the rotating electric machine and a non-armature coil for magnetizing or demagnetizing the permanent magnets of the rotor.
    Type: Grant
    Filed: January 18, 2016
    Date of Patent: October 1, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Sachiko Kawasaki, Hironori Tsuiki, Akira Hashimoto, Takashi Umeda
  • Patent number: 10367399
    Abstract: The described apparatus and method enable alteration of motor properties during operation of a motor. For example, the rotor of the motor may be adjustable, during motor operation, between a first diameter and a larger, second diameter. When the diameter of the rotor increases, the distance between the electromagnetic coils of the stator and the magnets of the rotor increases, thereby reducing the back-electromotor force (back-EMF) of the motor. When the back-EMF of the motor decreases, the torque of the motor decreases but the maximum revolutions per minute (RPM) increases. When the diameter of the rotor decreases, the distance between the electromagnetic coils of the stator and the magnets of the rotor decreases, thereby increasing the back-EMF of the motor. When the back-EMF of the motor increases, the torque of the motor increases but the maximum RPM decreases.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: July 30, 2019
    Assignee: Amazon Technologies, Inc.
    Inventors: Brian C. Beckman, Austin Brown
  • Patent number: 10305338
    Abstract: A rotor for a rotating electric machine has interference and lightening holes. The rotor includes a shaft and a rotor iron core. The shaft is press fitted in the rotor iron core. The rotor iron core includes a shaft hole, an outer area, an inner area in which the shaft is press fitted, a plurality of ribs connecting the outer area and the inner area. Each of the ribs includes a plurality of outer rib joints adjacent to the outer area, a plurality of outer rib portions adjacent to the outer area, a plurality of inner rib joints adjacent to the inner area, and a plurality of inner rib portions adjacent to the inner area. The outer rib portions are connected to the inner rib portions and the total number of the inner rib joints is larger than that of the outer rib joints.
    Type: Grant
    Filed: August 17, 2015
    Date of Patent: May 28, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Manabu Oshida, Satoshi Yamamura, Ryoji Kobayashi, Yuichiro Baba, Yuji Saito
  • Patent number: 10211689
    Abstract: An electric machine rotor includes a lamination configured to rotate about a central axis and a plurality of pairs of permanent magnets. Each pair of permanent magnets is arranged in a V-shaped pattern and affixed within the lamination to create a magnetic field for rotation of the lamination. The lamination also includes an outer periphery spanning circumferentially outside of the permanent magnets, wherein a mass-reduction cutout extends through the lamination nested within in a V-shape defined by the permanent magnets adjacent to an outer surface of the rotor. The lamination further includes a stress-reduction slot that extends through the outer periphery of the rotor.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: February 19, 2019
    Assignee: Ford Global Technologies, LLC
    Inventors: Feng Liang, Benedikt Groschup, Franco Leonardi
  • Patent number: 10141803
    Abstract: An axial field rotary energy device can include a rotor having an axis of rotation and a magnet; a stator coaxial with the rotor, the stator can have a printed circuit board (PCB) having a plurality of PCB layers that are spaced apart in an axial direction, each PCB layer can include a coil having only two terminals for electrical connections, each coil is continuous and uninterrupted between its only two terminals, each coil consists of a single electrical phase, and one of the two terminals of each coil is electrically coupled to another coil with a via to define a coil pair; and each coil pair is electrically coupled to another coil pair with another via.
    Type: Grant
    Filed: January 8, 2018
    Date of Patent: November 27, 2018
    Assignee: INFINITUM ELECTRIC INC.
    Inventors: Bernhard L. Schuler, Rich Lee, Jorgen Rasmussen
  • Patent number: 10128726
    Abstract: A method for manufacturing a laminate used for manufacturing a rotor is provided. The method includes: (a) stamping out a plurality of workpieces from a metal sheet wherein each of the workpieces has a temporarily-interlocking portion; and (b) obtaining a laminate including the workpieces integrated together by the temporarily-interlocking portion, wherein each of the workpieces further has a shaft hole, a magnet insertion hole, and a weight-reducing hole formed between the shaft hole and the magnet insertion hole, and the temporarily-interlocking portion is provided to the weight-reducing hole.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: November 13, 2018
    Assignee: MITSUI HIGH-TEC, INC.
    Inventors: Yukio Matsunaga, Hisatomo Ishimatsu, Yusuke Hasuo, Masahiro Izumi, Manabu Yazaki
  • Patent number: 10103596
    Abstract: According to some aspects of the present disclosure, example stator assemblies for three phase dynamoelectric machines and related winding methods are disclosed. An example stator assembly generally includes a non-segmented stator core including a stator yoke and a plurality of teeth. The stator assembly also includes a plurality of coil portions electrically coupled in a delta winding pattern, and including a first coil portion extending around a first one of the plurality of teeth and a second coil portion extending around a second one of the plurality of teeth. The stator assembly further includes a plurality of connection portions including a first connection portion extending between the first coil portion and the second coil portion and electrically coupling the first coil portion and the second coil portion. The first coil portion, the second coil portion and the first connection portion are defined by a continuous length of winding wire.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: October 16, 2018
    Assignee: EMERSON ELECTRIC CO.
    Inventors: Weirong Wang, Yongyue Yin
  • Patent number: 10069365
    Abstract: A three-phase electromagnetic motor includes: a stator that is formed by winding a winding around a magnetic pole formed between slots of a stator core; and a rotor that is disposed inside the stator and has a permanent magnet. The three-phase electromagnetic motor is formed of 8n poles and 6n slots (n is a natural number). 3n windings are wound around every other magnetic pole among a plurality of magnetic poles of the stator core.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: September 4, 2018
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Toshihito Miyashita, Manabu Horiuchi
  • Patent number: 9985486
    Abstract: A method of manufacturing a rotor for a magnet type rotating electrical machine includes the steps of: cutting and laminating pieces of the core of the rotor, to thereby form a core (3); mounting the core (3) on a rotating jig (10); forming a magnet piece (2p) into a predetermined shape by sintering; mounting a predetermined number of the magnet pieces (2p) on a regulating jig (20); pressing the magnet pieces (2p) by the regulating jig (20) while rotating the core (3) by the rotating jig (10), to thereby mount the magnet pieces (2p) on the core (3); and adjusting an axial position of the magnet piece (2p) so that an axial end surface of the core (3) and an axial end surface of the magnet piece (2p) are aligned with each other.
    Type: Grant
    Filed: October 22, 2012
    Date of Patent: May 29, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshihito Asao, Masayuki Miyaoka, Ryusuke Katayama, Akihiko Mori
  • Patent number: 9954423
    Abstract: A method of manufacturing a rotor according to the present invention includes: a process of stacking a plurality of electromagnetic steel plates on a jig 30 to fix the electromagnetic steel plates to the jig 30, and a process of inserting magnets 21 into a plurality of respective openings 11 included in a rotor core 10 in which the plurality of electromagnetic steel plates are stacked on one another. The magnets 21 are inserted into the respective openings 11 while a structure 80 including the rotor core 10 and the jig 30 is vibrated at a resonance frequency of the structure 80.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: April 24, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Yoshida, Hirotaka Kawaura
  • Patent number: 9825495
    Abstract: A rotating electric machine including a rotator including a small-angle rotator portion and a large-angle rotator portion respectively having different inter-magnet end angles, each being a plane angle formed between a line connecting one outermost peripheral-side end of a permanent magnet and an axial center of the rotator and a line connecting an outermost peripheral-side end of another permanent magnet and the axial center of the rotator. The rotator includes three layers of the small-angle rotator portion, the large-angle rotator portion, and the small-angle rotator portion, which are laminated in the stated order along an axial line of the rotator. Therefore, demagnetization due to a temperature rise of the permanent magnets is suppressed. In addition, a temperature distribution in the permanent magnets in the axial direction of the rotator is reduced.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: November 21, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Moriyuki Hazeyama, Akihiro Daikoku
  • Patent number: 9762096
    Abstract: An interior permanent magnet motor includes: a rotor; a stator; and a plurality of permanent magnets respectively inserted into a plurality of magnet insertion holes formed in a rotor core, the rotor core being formed by laminating a plurality of magnetic steel sheets, the magnetic steel sheets including first magnetic steel sheets each not having a magnet stopper in the magnet insertion hole, and second magnetic steel sheets each having magnet stoppers at both end portions of the magnet insertion hole, the rotor core including a laminate of the magnetic steel sheets in a lamination mode in which, when Hn represents a distance between an upper end surface of the second magnetic steel sheet and an upper end surface of the n-th second magnetic steel sheet, a progression of differences of Hn is a geometric progression.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: September 12, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohiro Oketani, Masahiro Nigo, Kazuhiko Baba, Koji Yabe
  • Patent number: 9694845
    Abstract: A motor control device includes a motor, a control device, and a motor drive circuit. The motor includes a motor rotor, a motor stator, and a plurality of coil groups divided into a first coil group and a second coil group of at least two systems for each of three phases, and configured to excite a stator core by three-phase alternating currents. In the motor drive circuit, a first motor drive circuit supplies a three-phase AC first motor drive current to the first coil group based on a command value, and a second motor drive circuit supplies a three-phase AC second motor drive current having a phase difference from a phase of the first motor drive current, to the second coil group.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: July 4, 2017
    Assignee: NSK LTD.
    Inventors: Yusuke Kikuchi, Gen Kimura, Zhipeng Tu
  • Patent number: 9692284
    Abstract: An electric motor apparatus comprises a rotor and a stator formed of at least two stator components, each of the at least two stator components having a substantially hollow cylindrical form. The rotor is mounted within the at least two stator components on a rotational mounting such that the rotor can rotate about a longitudinal central axis with respect to the stator. Each of the at least two stator components has at least two protrusions arranged at different circumferential points on an inner surface of the at least two stator components. Each protrusion has a winding mounted thereon. Control circuitry generates control signals to control power supplied to the windings on each stator component such that power can be controlled to each stator component independently.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: June 27, 2017
    Assignee: ARM Limited
    Inventor: David Pietromonaco
  • Patent number: 9653975
    Abstract: A rotor having permanent magnets 10 includes: a laminated core body 13 having a shaft hole 12 in the center thereof and magnet insertion holes 15 around the shaft hole 12; permanent magnets 16 disposed in the respective magnet insertion holes 15; and first and second end face plates 18, 19 disposed on one axial end and the other axial end of the laminated core body 13, respectively, the first and second end face plates 18, 19 including first and second through holes 32, 33, respectively. The first and second through holes 32, 33 each overlap a contour of a magnet insertion hole 15 on a radially inner side or a radially outer side in a plan view, and have first and second tapered portions 34, 35 gradually expanding the diameter toward the magnet insertion hole 15, respectively.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: May 16, 2017
    Assignees: MITSUI HIGH-TEC, INC., HONDA MOTOR CO., LTD.
    Inventors: Hisatomo Ishimatsu, Manabu Yazaki, Koichi Ono
  • Patent number: 9650120
    Abstract: An electric drive shaft is disclosed including at least one speed-variable generator for generating a voltage with a variable amplitude and a variable frequency, and at least one speed-variable drive motor supplied with the voltage. The drive shaft enables repercussions on the voltage during sudden load changes, and therefore the complexity of the regulation for stabilizing the voltage, to be reduced due to the generator including a supraconductor winding, especially a high-temperature supraconductor winding.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: May 16, 2017
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Rainer Hartig
  • Patent number: 9627934
    Abstract: A commutated DC motor (10) includes a stator (12) and a rotor (14) mounted in the stator (12). The stator (12) has 2P magnetic poles, wherein P is an integer greater than 1. The rotor (14) includes a rotor shaft (81) with a rotor core (85), and a commutator (83) fixed thereto. The rotor core (85) has multiple teeth defining m×P slots therebetween, wherein m is an odd integer greater than 1. The commutator (83) has k×m×P segments, wherein k is 1 or 2. A rotor winding (87) formed by winding a single continuous wire is received in the slots of the rotor core (85) and connected to the segments of the commutator (83), and has k×m winding units. Each winding unit includes P coils in series connection and is directly connected to only two segments.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: April 18, 2017
    Assignee: Johnson Electric S.A.
    Inventors: Rui Feng Qin, Fei Liu, Ji Yu Liang, Shu Hai Yuan, Xin Hui Guan
  • Patent number: 9431934
    Abstract: An embodiment of a motor controller includes a motor driver and a signal conditioner. The motor driver is operable to generate a motor-coil drive signal having a first component at a first frequency, and the signal conditioner is coupled to the motor driver and is operable to alter the first component. For example, if the first component of the motor-coil drive signal causes the motor to audibly vibrate (e.g., “whine”), then the signal conditioner may alter the amplitude or phase of the first component to reduce the vibration noise to below a threshold level.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: August 30, 2016
    Assignees: STMICROELECTRONICS, INC., STMICROELECTRONICS S.r.l.
    Inventors: Frederic Bonvin, Ezio Galbiati
  • Patent number: 9385566
    Abstract: A rotor of the present invention comprises a cylindrically shaped rotor core, and a plurality of magnets arranged at predetermined intervals at an outer circumferential surface of the rotor core. The outer circumferential surface of the rotor core is formed with a plurality of projections for positioning the plurality of magnets in the circumferential direction, and each of the projections extends over only part of outer circumferential surface of the rotor core in the height direction. The rotor core includes a projection-equipped cylindrical part which has an outer circumferential surface over which the plurality of projections extend, and a projection-less cylindrical part which has an outer circumferential surface over which the plurality of projections do not extend.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: July 5, 2016
    Assignee: Fanuc Corporation
    Inventor: Takahiro Shimamori
  • Publication number: 20150145365
    Abstract: A rotor core formed with a shaft hole at the center thereof is provided. A cylindrical member fitted into the shaft hole of the rotor core along an outer peripheral surface of the cylindrical member is provided. A drive shaft inserted into a hollowed part of the cylindrical member (collar) is provided. The collar is made of the material having a lower Young's modulus than those of the rotor core and the drive shaft, and is formed such that an inner peripheral surface of the collar is a tapered surface. The drive shaft has, at an outer periphery thereof, a tapered surface such that the tapered surface is in surface contact with the tapered surface of the collar in fitting of the drive shaft into the collar.
    Type: Application
    Filed: June 11, 2013
    Publication date: May 28, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hideki Fujii, Kiyotaka Nishijima, Masaki Hirano
  • Publication number: 20150137645
    Abstract: A spindle motor may include: a sleeve rotatably supporting a shaft; a rotor coupled to the shaft and rotating together therewith; and a base member fixedly coupled to the sleeve, wherein the base member includes a plurality of penetration holes formed therein so as to penetrate therethrough, and a magnetic material is inserted into at least one of the plurality of penetration holes, and non-magnetic materials are inserted into the remaining penetration holes.
    Type: Application
    Filed: November 18, 2014
    Publication date: May 21, 2015
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventor: Nam Ki PARK
  • Publication number: 20150115757
    Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.
    Type: Application
    Filed: October 25, 2013
    Publication date: April 30, 2015
    Applicant: General Electric Company
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi EL-Refaie, Kum-Kang Huh
  • Patent number: 9018808
    Abstract: A rotor assembly including a rotating shaft, a rotor core, a permanent magnet, a magnetic ring support, and a magnetic ring. The permanent magnet is mounted on the outer side surface of the rotor core. The magnetic ring is nested on the magnetic ring support, and the magnetic ring support and the rotor core are made as a whole by injection molding. The rotor assembly is relatively simple to produce, low in cost, and features improved efficiency.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 28, 2015
    Assignee: Zhongshan Broad-Ocean Motor Manufacturing Co., Ltd.
    Inventors: Yonggang Liu, Chongsheng Zeng
  • Patent number: 9017419
    Abstract: Linear actuators that allow for improved self-locking properties without sacrificing axial response are provided. A linear actuator can have two screws extending from opposite ends of the actuator. The screws are joined by and threadably coupled to an elongate rotating nut. An elongate magnet is disposed around and coupled to the nut, and a stator including coils surrounds the magnet and nut. The magnet and nut are not axially fixed with respect to the stator. Rotation of the nut causes axial displacement of both screws, causing the screws to move closer together or farther apart. A pitch of the screw threads can be selected to enhance self-locking properties.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: April 28, 2015
    Assignee: Össur hf
    Inventors: David Landry, Bjarni Andresson
  • Publication number: 20150097458
    Abstract: A rotor for a permanent magnet electric machine includes a rotor core and a plurality of permanent magnet bundles located at the rotor core. Each permanent magnet bundle includes a first magnet of a first magnetic material and a second magnet of a second magnetic material located radially outboard of the first magnet. The second magnet has an increased resistance to demagnetization relative to the first magnet. A permanent magnet electric machine includes a stator and a rotor magnetically interactive with the stator. The rotor includes a rotor core and a plurality of permanent magnet bundles located at the rotor core. Each permanent magnet bundle includes a first magnet of a first magnetic material and a second magnet of a second magnetic material located radially outboard of the first magnet. The second magnet has an increased resistance to de-magnetization relative to the first magnet.
    Type: Application
    Filed: April 16, 2012
    Publication date: April 9, 2015
    Applicant: OTIS ELEVATOR COMPANY
    Inventors: JimPo Wang, Zbigniew Piech
  • Publication number: 20150084465
    Abstract: According to one embodiment, a rotary electric machine includes a rotor that is rotatable at a predetermined position and includes a plurality of first magnetic members arranged along an outer circumferential surface, the first magnetic members each including a first magnetic pole and a second magnetic pole. The rotary electric machine includes a first supporting member that surrounds a periphery of the rotor. The rotary electric machine includes a plurality of second supporting members that are fixed to an inner circumferential surface of the first supporting member. The rotary electric machine includes a plurality of second magnetic members that are fixed on side surfaces of the second supporting members and that have a third magnetic pole facing the first magnetic pole with an air gap and a fourth magnetic pole facing the second magnetic pole with an air gap.
    Type: Application
    Filed: September 11, 2014
    Publication date: March 26, 2015
    Inventors: Hiroshi TAKAHASHI, Yasuhito Ueda
  • Publication number: 20150084461
    Abstract: A motor includes a shaft supported by upper and lower bearings and rotatable about an axis; a rotor magnet fixed to the shaft; a stator arranged radially outside and opposite to the rotor magnet with a gap therebetween; an upper bracket holding the upper bearing; and a lower bracket holding the lower bearing. The upper bracket includes an upper cylindrical cover press fitted to a stator core from above, an upper bearing holding portion, and a top plate portion arranged to join the upper cylindrical cover and the upper bearing holding portion. The lower bracket includes a lower cylindrical cover press fitted to the stator core from below, a lower bearing holding portion, and a bottom plate portion arranged to join the lower cylindrical cover and the lower bearing holding portion. Each of the upper and lower brackets is fixed to the stator core through press fitting.
    Type: Application
    Filed: May 1, 2014
    Publication date: March 26, 2015
    Applicant: NIDEC CORPORATION
    Inventors: Keizo FURUKAWA, Kazuya KITAJI
  • Patent number: 8981609
    Abstract: Disclosed is a generator for a wind energy installation having a rotor which has permanent magnets and is directly connected for drive purposes to a blade rotor of the wind energy installation, and having a stator which has an iron core composed of laminates. The generator is formed without the rotor or the stator on the external circumference as a completely surrounding housing, and the laminates of the stator are connected to one another by adhesive bonding and/or welding.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: March 17, 2015
    Assignee: Wind-Direct GmbH
    Inventor: Stephan Joeckel
  • Patent number: 8975797
    Abstract: A disk-rotating motor includes a rotor section including a rotor magnet attached to a rotor frame and a shaft fixed to a center of the rotor frame, and a stator section including a shaft-bearing which bears the shaft, wherein the stator section includes the shaft-bearing, a shaft-bearing housing which holds the shaft-bearing, a thrust plate which bears the shaft in an axis direction, a stator core which is arranged to face the rotor magnet and provided with wire-winding, a core holder which holds the stator core, and a bracket which holds the shaft-bearing housing. The bracket has a projecting part which fixes the shaft-bearing at a central part thereof, an inner diameter part of the shaft-bearing is press-fitted to be tightened to the projecting part, and an outer diameter part of the shaft-bearing housing is adhered to be tightened to an inner diameter part of the core holder.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: March 10, 2015
    Assignee: Minebea Co., Ltd.
    Inventors: Toshiyuki Nishikata, Kumio Masuda
  • Publication number: 20150061441
    Abstract: An electric machine includes a machine housing and a stator disposed at least partially within the housing. The electric machine also includes a radially embedded permanent magnet rotor disposed at least partially within the housing and an endcap. The rotor has at least one radially embedded permanent magnet that is configured to provide increased flux to reduce motor efficiency loss. The endcap is operably connected to a distal portion of the rotor.
    Type: Application
    Filed: August 21, 2014
    Publication date: March 5, 2015
    Inventors: Daniel Shawn Figgins, Harold Clifton Kingrey, Michael Allen Marks, Jeffrey Alan Hall, Subhash Marutirao Brahmavar, Alan Jacob Manz, David Allen Clendenen, Rafal Pawel Rohoza
  • Publication number: 20150061440
    Abstract: Halbach Array electric motor with substantially contiguous electromagnetic cores, comprised of a plurality of electromagnets arranged in Halbach Array sequence, whose horizontal cores are equipped with fork-like prongs to provide substantial contiguity with vertical cores, assembled to serve as a circular or linear stator, rotor or both, and a plurality of permanent magnets likewise arranged in a Halbach Array sequence, assembled to serve as a circular or linear stator or rotor where required.
    Type: Application
    Filed: August 29, 2013
    Publication date: March 5, 2015
    Inventor: Roberto Sanchez Catalan
  • Publication number: 20150048704
    Abstract: A double stator permanent magnet machine includes an inner stator having a back iron and a set of inner stator poles connected to the back iron, a rotor having a shaft and a set of segments, each segment having a permanent magnet, adjacent the inner stator and rotatively coupled to the inner stator, an outer stator having a set outer stator poles, adjacent the rotor and rotatively coupled to the rotor, a set of inner windings disposed between each of the inner stator poles, and a set of outer windings disposed between each of the outer stator poles.
    Type: Application
    Filed: June 27, 2014
    Publication date: February 19, 2015
    Applicant: The Board of Regents, The University of Texas System
    Inventors: Babak Fahimi, Wei Wang
  • Publication number: 20150042194
    Abstract: A single-phase brushless motor includes a stator and a rotor rotatable with respect to the stator. The rotor includes a number of permanent magnetic poles. The stator includes a stator core and a winding wound on the stator core. The stator core includes an outer annular portion, an inner annular portion, and connecting portions connecting the inner and outer annular portions. The winding is wound around the connecting portions. The rotor is received in the inner annular portion. The inner annular portion and the rotor form a substantially uniform air gap. A recess is formed in an inner surface of a part of the inner annular portion between each pair of adjacent connecting portions. A center of each recess deviates from a center line of symmetry of the corresponding pair of connecting portions.
    Type: Application
    Filed: August 8, 2014
    Publication date: February 12, 2015
    Inventors: Yue LI, Bao Ting LIU, Chui You ZHOU, Yong WANG, Ming CHEN, Xiao Ning ZHU
  • Publication number: 20150035402
    Abstract: An internal permanent magnet machine includes a rotor assembly having a shaft comprising a plurality of protrusions extending radially outward from a main shaft body and being formed circumferentially about the main shaft body and along an axial length of the main shaft body. A plurality of stacks of laminations are arranged circumferentially about the shaft to receive the plurality of protrusions therein, with each stack of laminations including a plurality of lamination groups arranged axially along a length of the shaft and with permanent magnets being disposed between the stacks of laminations. Each of the laminations includes a shaft protrusion cut formed therein to receive a respective shaft protrusion and, for each of the stacks of laminations, the shaft protrusion cuts formed in the laminations of a respective lamination group are angularly offset from the shaft protrusion cuts formed in the laminations in an adjacent lamination group.
    Type: Application
    Filed: August 5, 2013
    Publication date: February 5, 2015
    Applicant: General Electric Company
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi EL-Refaie, Kum-Kang Huh, James Pellegrino Alexander
  • Publication number: 20150028707
    Abstract: An interior permanent magnet motor includes a stator having teeth on which a coil is wound, a rotor rotatably provided inside the stator, the rotor including a plurality of rotor sectors, and at least two permanent magnet recesses formed between the rotor sectors. Ferrite permanent magnets are embedded in predetermined ones of the permanent magnet recesses that are formed in an inner portion of the rotor. Rare-earth permanent magnets are embedded in the other ones of the permanent magnet recesses that are formed in an outer portion of the rotor.
    Type: Application
    Filed: June 26, 2012
    Publication date: January 29, 2015
    Applicant: Komotek Co., Ltd.
    Inventors: Deok Geun Kim, Han Sam Cho, Kyu Yun Hwang