Salient Pole Patents (Class 310/269)
  • Patent number: 10381889
    Abstract: A permanent magnet machine and a rotor assembly for the permanent magnet machine. The permanent magnet machine includes a stator assembly including a stator core configured to generate a magnetic field and extending along a longitudinal axis with an inner surface defining a cavity and a rotor assembly including a rotor core and a rotor shaft. The rotor core is disposed inside the stator cavity and configured to rotate about the longitudinal axis. The rotor assembly further including a plurality of permanent magnets for generating a magnetic field which interacts with the stator magnetic field to produce torque. The permanent magnets are disposed within one or more cavities formed in a sleeve component. The sleeve component configured to include a plurality of cavities or voids therein and thus provide minimal weight to the permanent magnet machine. The permanent magnet machine providing increased centrifugal load capacity, increased power density and improved electrical performance.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: August 13, 2019
    Assignee: General Electric Company
    Inventors: Narendra Digamber Joshi, Manoj Ramprasad Shah, James William Bray, Randy Marinus Vondrell, Kurt David Murrow, Jeffrey Anthony Hamel, Samuel Jacob Martin
  • Patent number: 10333361
    Abstract: To provide a dynamo-electric machine with which it is possible to improve electrical characteristics by reducing the leakage magnetic flux and increasing the effective magnetic flux. In order to achieve this, a magnetic pole head (23) for restraining a field winding (24) is provided with restraining parts (31) for restraining only the coil end (24b) of the field winding (24). The restraining parts (31) are positioned further axially outside or inside than both axial end surfaces (11a) of a stator core (11). The restraining parts (31) have formed thereon: an inclined surface (31a) positioned further radially inside than the radially outside end surface (23a), of the magnetic pole head (23), which radially faces the inner circumferential surface (11b) of the stator core (11); and a step (31b) for linking the radially outside end surface (23a) and the inclined surface (31a) in the radial direction.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: June 25, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventors: Ryota Ishii, Takuya Kurasawa
  • Patent number: 10149478
    Abstract: The present invention provides a formulation characterised by the simultaneous presence in cyclodextrin based supramolecular complexes, of two components, one of which is a neonicotinoid selected from the group consisting of Thiacloprid and Thiamethoxam and the other possesses an activity synergistic with the first, enhancing its effectiveness. The synergistic component that is able to synergistically enhance the activity of the active principle is piperonyl butoxide, and. Processes for preparing said formulation and its use for the activities herein indicated are further aspects of the present invention.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: December 11, 2018
    Assignee: Endura S.P.A.
    Inventors: Oreste Piccolo, Valerio Borzatta, Giovanna Delogu, Elisa Capparella, Cristina De Candia, Carlotta Gobbi, Giovanna Di Blasi
  • Patent number: 10141800
    Abstract: A magnet-embedded rotor includes a cylindrical rotor core that rotates together with a rotating shaft; and permanent magnets embedded in the rotor core. The rotor core includes core members, and each core member includes a tubular portion into which the rotating shaft is inserted and projecting portions formed to project in a radial direction of the tubular portion from an outer periphery of the tubular portion and arranged apart from each other in a circumferential direction of the tubular portion. The rotor core is formed by assembling the core members such that the tubular portions are arranged on one straight line and the projecting portion of the core member and the projecting portion of the other core member are adjacent to each other in a circumferential direction of the rotor core. The permanent magnet is embedded in each projecting portion of each core member.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: November 27, 2018
    Assignee: JTEKT CORPORATION
    Inventors: Keita Nimura, Naotake Kanda, Ryosuke Yamaguchi
  • Patent number: 9973050
    Abstract: The invention relates to an asynchronous machine (1) as can be used particularly in electric vehicles or hybrid vehicles. The asynchronous machine (1) has a rotor (5) and a stator (3). The asynchronous machine is designed and controlled in such a manner that it has a pole pair number p of p=3. Because of the reduced yoke saturation that can consequently be achieved, the stator yoke (9) can be designed with a lesser height hy1, such that a ratio of the outer rotor diameter D2a to the outer stator diameter D1a can assume values between 0.7 and 0.8. As a result, enlarged rotor teeth (19) and correspondingly enlarged rotor grooves (21) can be formed in the rotor (5), such that electrical losses in the material in the rotor grooves (21) acting as the rotor coil element (23) are smaller in comparison to conventional asynchronous machines.
    Type: Grant
    Filed: October 15, 2013
    Date of Patent: May 15, 2018
    Assignee: Robert Bosch GmbH
    Inventors: Patrick Heuser, Miguel Ruiz De Larramendi, Mercedes Herranz Gracia
  • Patent number: 9843240
    Abstract: An electric motor has efficient self-cooling. The electric motor contains a rotor that is rotatably mounted with respect to a stator. On a first sub-segment of an end face of the rotor, a first air-guiding contour is formed that, during rotation of the rotor in a reference rotation direction, generates an outwardly directed air flow. On a second sub-segment of the same end face, a second air-guide contour is formed that, during rotation of the rotor in a reference rotation direction, generates an inwardly directed air flow.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: December 12, 2017
    Assignee: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Wuerzburg
    Inventor: Tobias Hillenbrand
  • Patent number: 9692277
    Abstract: An integrated drive system assembly is provided that combines an electric motor, a power inverter assembly and a gearbox into a single, multi-piece enclosure. Combining these components into a single enclosure reduces weight, reduces drive system complexity, reduces system volume, simplifies assembly integration into an electric vehicle, reduces manufacturing cost, allows the flexible and lengthy electrical cables between the power inverter and the electric motor to be replaced with short, low loss, rigid bus bars, and simplifies component cooling by allowing the use of a common thermal management system. The common thermal management system includes a liquid coolant loop that is thermally coupled to the electric motor, the power inverter assembly and the gearbox.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: June 27, 2017
    Assignee: Tesla, Inc.
    Inventors: Edwin M. Pearce, Jr., Jim Robbins, Benjamin D. Dettmann, Nicholas R. Kalayjian, Michael R. Kubba
  • Patent number: 9653953
    Abstract: A rotor for a rotating electric machine includes a core body having a through-hole, a magnet, a tubular portion, and a plate part having an opening. The through-hole passes through the core body in a thickness direction. The magnet is disposed on an outer wall of the core body. The tubular portion is placed radially-outward of the core body. The plate part seals at least one end of the tubular portion in an axial direction. The opening is provided at a position corresponding to the through-hole and passes through the plate part in a thickness direction. The through-hole is one of a plurality of the through-holes, and the magnet is one of a plurality of the magnets.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: May 16, 2017
    Assignee: DENSO CORPORATION
    Inventor: Asuka Tanaka
  • Patent number: 9500275
    Abstract: A flap type electronic automatic transmission lever apparatus may include a console, a shift flap unit electrically connected to a transmission control unit (TCU) of a vehicle at a center of the console, and having at last four or more shift flaps, touch sensor units, each including a shift sensor disposed at a center of a corresponding shift flap, a forward-turn sensor disposed at an upper portion of the corresponding shift flap, and a rearward-turn sensor disposed at a lower portion of the corresponding shift flap, a shafts, each connected to a bottom of the corresponding shift flap to enable the corresponding shift flap to turn, step motors, each connected to one end of corresponding shaft, and shaft-fixing portions, each connected to an opposite end of the corresponding shaft.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: November 22, 2016
    Assignee: Hyundai Motor Company
    Inventor: Eun-Sik Kim
  • Patent number: 9423021
    Abstract: A flap type electronic automatic transmission lever control method may include a step of turning on a start-up of a vehicle by control unit, a step of detecting a touch by a transmission stage recognition sensor, a step of detecting a touch by forward or backward rotation recognition sensor, a step of detecting the touch by a transmission stage recognition sensor when the forward rotation recognition sensor detects the touch, or detecting the touch by a transmission stage recognition sensor when the backward rotation recognition sensor detects the touch, a step of rotating the transmission stage flap and the upper transmission stage flap forward or rotating the transmission stage flap and the lower transmission stage flap backward by a step motor, a step of outputting transmission signal of the transmission stage corresponding to upper or lower transmission stage flap by the control unit, and a step of turning OFF the start-up.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: August 23, 2016
    Assignee: Hyundai Motor Company
    Inventor: Eun-Sik Kim
  • Patent number: 9077223
    Abstract: An electrical rotating machine is provided with a salient-pole rotor, which is composed of magnetic field pole bodies integrally formed with a shaft and pole shoes constituting magnetic field pole heads. Each pole shoe is fixedly joined on the corresponding one of the magnetic field pole bodies with a plurality of bolts. Each pole shoe or its corresponding magnetic field pole body is provided with at least one protrusion or recess for restricting a conically-shaped compression domain in a compression domain that occurs in the pole shoe when the pole shoe is joined on the corresponding magnetic field pole body with the bolts.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: July 7, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Makoto Imura, Tomohiro Naruse, Motonobu Iiduka, Shigeki Nakae, Takeshi Mori, Takayuki Koyama
  • Patent number: 8853912
    Abstract: A coil fixing device capable of accurately positioning and fixing a coil to a slot of a stator core of an electric motor, and an electric motor having the fixing device, while not using adhesive and having a structure not affecting the characteristic of the electric motor. A positioning member of the fixing device has a coupling member positioned at an axial end of the stator core; a plurality of protruding portions connected to the coupling member at the same angular intervals as the coils, each protruding portion radially inwardly extending from the coupling member; and a latching portion connected to a front end of each protruding portion, the latching portion extending from the front end of each protruding portion in a direction across an extending direction of the protruding portion.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: October 7, 2014
    Assignee: FANUC Corporation
    Inventor: Tatsuya Senoo
  • Patent number: 8803376
    Abstract: An AC motor is provided. In the AC motor, there are M pieces (M is an integer of 3 or more) of stator pole groups SPG are arranged in a rotor axis direction, where each of the stator poles groups is composed of a plurality of stator poles which are for the same phase and arranged in a circumferential direction of the motor. Between the stator pole groups SPG, “M?1” pieces of annular windings WR are arranged which allow one-way current to flow therethrough. The windings WR are arranged such that the directions of current passing therethrough are reversed in turn in the rotor axis direction. The stator pole groups SPG are excited to generate magnetic fluxes ?G directed in a one way. The excited directions of the magnetic fluxes ?G are reversed in turn in the rotor axis direction.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: August 12, 2014
    Assignee: Denso Corporation
    Inventors: Masayuki Nashiki, Tomokazu Ishikawa
  • Patent number: 8786161
    Abstract: A motor in which drive current supplied to a winding is controlled in accordance with a rotational position of a rotor detected from a waveform of an induced voltage between phases. The motor is provided with a stator including 3×n teeth and windings for three phases. A rotor includes a rotor core, an n number of magnets, and an n number of salient poles. The magnets function as one of the magnetic poles, the salient poles function as the other one of the magnetic poles. Each salient pole is spaced apart by a gap from the adjacent ones of the magnets in the circumferential direction. The magnets and gap are arranged inward in the radial direction from the rotor core. An electrical angle between two ends of each magnet is set to be smaller than an electrical angle between two ends of each salient pole.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: July 22, 2014
    Assignee: ASMO Co., Ltd.
    Inventors: Yoshiaki Takemoto, Toshihiro Uchida, Seiya Yokoyama, Shigemasa Kato
  • Patent number: 8749105
    Abstract: A high-efficiency magnetic inductor rotary machine in which eddy current loss is reduced even if driven at super-high-speed rotation, and a fluid transfer apparatus that uses the same. In the magnetic inductor rotary machines, first and second stator cores are disposed coaxially such that circumferential positions of teeth are aligned, and first and second rotor cores are fixed coaxially to a rotating shaft such that salient poles are offset by a pitch of half a salient pole circumferentially, and are disposed on an inner peripheral side of the first and second stator cores. A salient pole width of the salient poles of the first and second rotor cores is configured so as to be greater than an opening width of slots of a stator.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: June 10, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideaki Arita, Masaya Inoue, Masahiro Iezawa, Toshihiko Miyake
  • Patent number: 8680740
    Abstract: A stator for an electrical machine, the stator including a plurality of stator teeth distributed in a non-uniform pattern with a short and long tooth spans along a circumference of the stator, wherein each stator slot between two stator teeth distanced by a long tooth span including an intermediate tooth for carrying a magnetic flux.
    Type: Grant
    Filed: August 27, 2011
    Date of Patent: March 25, 2014
    Assignee: ABB Research Ltd.
    Inventor: Robert Chin
  • Patent number: 8648514
    Abstract: In a rotary electric motor a first stator core and a second stator core are disposed coaxially so as to be separated by a predetermined distance axially and such that circumferential positions of teeth are aligned, and a first rotor core and a second rotor core on which salient poles are disposed at a uniform angular pitch circumferentially are fixed coaxially to a rotating shaft so as to be positioned on inner peripheral sides of the first stator core and the second stator core, respectively, and so as to be offset circumferentially by a pitch of half a salient pole from each other. A first permanent magnet that is magnetically oriented such that a direction of magnetization is radially inward is disposed on an outer peripheral surface of a core back of the first stator core, and an outer peripheral surface of the first permanent magnet and the outer peripheral surface of the core back of the second stator core are linked by a frame that is made of a magnetic material.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: February 11, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideaki Arita, Masaya Inoue, Masahiro Iezawa, Hayato Yoshino, Kazuhiko Baba, Hitoshi Kawaguchi, Toshihiko Miyake
  • Patent number: 8624463
    Abstract: The invention relates to a transverse flux motor comprising at least one stator and at least one rotor. Magnetically active elements of the stator are formed in an annular manner and with a U-shaped inner contour on the stator and the rotor is in the form of a disk or a ring. The rotor comprises magnetically active sections consisting of a soft-magnetic or permanent-magnetic material, that are radially oriented in an annular manner towards at least one front surface of the rotor. The invention also relates to a drive method according to the transverse flux principle, whereby magnetically active sections of at least one disk-type or annular rotor, that are radially oriented in an annular manner towards at least one front surface of the rotor, interact with magnetically active elements having a U-shaped inner contour in an annular manner on at least one stator, in order to rotate the rotor.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: January 7, 2014
    Assignee: Leantec Motor GmbH & Co. KG
    Inventor: Michael Schmidt
  • Patent number: 8492953
    Abstract: A small PMDC motor has a wound salient pole armature. The armature 22 has a winding guide 38 disposed within each winding tunnel 36 formed between adjacent salient poles of the armature. The winding guide 38 is arranged to separate the radially inner portion of the respective winding tunnel whereby windings 30 wound about the adjacent salient poles of the armature are restrained from entering into the opposite radially inner portion of the winding tunnel 36.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: July 23, 2013
    Assignee: Johnson Electric S.A.
    Inventors: James Ching Sik Lau, Duncan Yiu Lung Wong, Chi Hang Ngai
  • Patent number: 8405273
    Abstract: A universal motor has a stator and a rotor. The stator has stator core and a stator winding. The stator core has a yoke with two ends and two equivalent salient poles formed at the ends of the yoke respectively. The stator winding is wound on the yoke.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: March 26, 2013
    Assignee: Johnson Electric S.A.
    Inventors: Yue Li, Bao Ting Liu, Ji Dong Chai, Wen Liang Li
  • Patent number: 8390156
    Abstract: A rotor for a multipolar synchronous rotating machine includes a plurality of salient poles, each salient pole including a polar body and being surrounded by an induction coil including a plurality of layers of coiled wire; a plurality of spacers such that each spacer of the plurality of spacers creates a first spacing between two successive layers of coiled wire of the plurality of layers for the circulation of coolant between each layer of coiled wire of the plurality of layers, the rotor including a second spacing between the polar body and each layer of coiled wire of the plurality of layers for the circulation of the coolant between the induction coil and the polar body.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: March 5, 2013
    Assignee: Jeumont Electric
    Inventors: Daniel Laloy, Guy Legoix, Alain Ducrot, Brahim Ammar
  • Patent number: 8334627
    Abstract: In a compact motor 1 comprising a cylindrical permanent magnet 13, which is affixed to the inner surface of a hollow cylindrical yoke 12, and an armature core 22, which is provided at the interior of the permanent magnet 13, the armature core 22 comprises three slots 29 disposed at a uniform pitch, the permanent magnet 13 is bipolar-magnetized, and each magnetic pole has a maximum magnetic flux density value P in a range of 40° to 50° from the center at both sides of the magnetic pole, the maximum value P being within the range of 1.3 times to 1.8 times the magnetic flux density at the center of the magnetic pole.
    Type: Grant
    Filed: March 2, 2010
    Date of Patent: December 18, 2012
    Assignee: Tokyo Parts Industrial Co., Ltd.
    Inventor: Naohisa Koyanagi
  • Patent number: 8314527
    Abstract: A flywheel levitation apparatus and associated method are described for use in a flywheel driven power storage system having a rotor and which provides for an upward vertical movement of the rotor along an axis of rotation. The rotor includes a rotor face defining a cutaway section. A magnetic lifting force is applied to the rotor to at least in part serve in levitating the rotor. The magnetic lifting force exhibits a modified gap sensitivity that is smaller as compared to a conventional gap sensitivity that would be exhibited in an absence of the cutaway section.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: November 20, 2012
    Assignee: Beacon Power, LLC
    Inventor: Jimpo Wang
  • Patent number: 8274182
    Abstract: A linear motor includes a stator having field poles arranged linearly with opposing polarities arranged in an alternating manner; and a rotor having an armature core with teeth that faces a pole face of the field poles with a gap, and coils wound around the teeth. The stator and the rotor are supported in a slidable manner, a direction perpendicular to a sliding direction of the rotor and in parallel with the pole face is defined as a stacking direction. A head of each of the teeth has an extended portion extended in the sliding direction. At least heads of the teeth arranged at both ends of the armature core along the sliding direction is divided into a plurality of areas along the stacking direction. At least one of extended portions arranged on adjacent areas is extended by a different length along the sliding direction.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: September 25, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Misa Nakayama, Shinichi Yamaguchi, Koki Naka, Kazumasa Ito, Toshinori Tanaka
  • Patent number: 8198776
    Abstract: A current-energized synchronous motor (1) suitable in particular for vehicle drives. It includes a stator (2) and a rotor (3) carrying the energizer winding (7). The rotor (3) has at least two rotor poles (4) with one energizer winding (7) each. The rotor includes at least one selective magnetic flux barrier, in particular in the form of a radial slot (8) along the main axis (4A) of the rotor pole (4). This flux barrier is provided in each rotor pole (4) for increasing the reluctance moment of the current-energized synchronous motor (1).
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: June 12, 2012
    Assignee: BRUSA Elektronik AG
    Inventors: Arno Mathoy, Verena Mathoy, legal representative, Anna Mathoy, legal representative, Eva Mathoy, legal representative
  • Patent number: 8120222
    Abstract: A rotating electrical machine includes a stator and a rotor arranged to rotate inside the stator. The rotor includes a plurality of permanent magnets arranged to produce a radial magnetic flux in an airgap between the rotor and the stator. The machine also includes a stationary excitation coil. The rotor also includes a plurality of low reluctance elements. A current through the stationary excitation coil causes a magnetic flux to be established in a magnetic flux path which passes into the rotor through a first low reluctance element and out of the rotor through a second low reluctance element, which magnetic flux combines with the radial magnetic flux produced by the permanent magnets in the airgap. This arrangement can allow control of the field within a permanent magnet radial flux machine.
    Type: Grant
    Filed: July 13, 2009
    Date of Patent: February 21, 2012
    Assignee: Cummins Generator Technologies Limited
    Inventor: Neil Brown
  • Patent number: 8004141
    Abstract: The present invention relates to a two-phase brushless DC motor which can increase a pemerance coefficient of a rotor to the maximum to thereby improve efficiency and starting feature of the motor, and to reduce torque ripple and noise thereof. The brushless motor of the present invention includes a two-phase winding stator having 4×n winding poles and auxiliary poles provided between the winding poles, and a rotor constituted by 6×n permanent magnet rotating poles having divided angle. Auxiliary poles between the stator poles can be provided. The two-phase brushless motor of the present invention can be driven by a control device for the two-phase motor which can transform electric power and rectify electronically.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: August 23, 2011
    Assignee: SNTech Inc.
    Inventor: Young-Chun Jeung
  • Patent number: 7982359
    Abstract: A salient pole machine and method of forming the same comprising a rotating field assembly and at least one inter-pole cap connected to the rotating field assembly and/or at least end coil cap connected to the rotating field assembly. Each inter-pole cap preferably includes a top surface that has a curvature and/or at least one cavity. Each end coil cap may include at least one support. The salient pole machine may also include at least one fan assembly independent of the rotating field assembly. In a preferred embodiment, the salient pole machine includes at least one mounting plate, wherein each fan assembly is mounted on the mounting plate. The inter-pole caps and the end coil caps preferably comprise composites, polymers, alloys, ceramics, or naturally occurring materials.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: July 19, 2011
    Assignee: Emerson Electric Co.
    Inventors: Joseph B. McCabe, Brian N. Cox, Louis R. Myers, Jacques Andre Saint-Michel, John T. Fowler, Jerhod T. Smithback, Joshua A. Lorenz
  • Patent number: 7948145
    Abstract: A plurality of concavities and convexities is provided on tips of all rotor teeth 24 of the SR motor 5. Depths of the concave portions ? are deep on an edge side where a stator tooth 23 and rotor tooth 24 first approach and are shallow as a facing area between the stator tooth 23 and rotor tooth 24 increases. Therefore, magnetic resistance between the stator tooth 23 and rotor tooth 24 becomes high at an early stage of the stator tooth 23 and rotor tooth 24 facing each other and becomes low as the facing area between the stator tooth 23 and rotor tooth 24 increases. As a result, torque fluctuation can be suppressed at a time of a large current and a minimum generation torque can be increased at a time of a small current.
    Type: Grant
    Filed: December 24, 2008
    Date of Patent: May 24, 2011
    Assignee: Denso Corporation
    Inventors: Seiji Nakayama, Taku Itoh, Kiyoshi Kimura
  • Patent number: 7915771
    Abstract: The invention relates to a salient-pole machine comprising at least one field coil that extends in an axial direction of the salient-pole machine and is located below a pole shoe on a rotor body. Said machine is characterized in that the field coil is pressed against the pole shoe by means of at least one spring that is provided between the field coil and the rotor body and that an axial cooling channel is created in the gap between the field coil and the rotor body that is formed by the spring. The spring is configured in particular as a bent plate spring.
    Type: Grant
    Filed: February 1, 2005
    Date of Patent: March 29, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventors: Haiko Adolf, Günther Hautke, Jens Möbius
  • Patent number: 7911090
    Abstract: A stator of an electrical machine has a cross section, a longitudinal extension, a jacket surface, a plurality of winding holders configured for receiving field windings, the winding holders being distributed inhomogenously around an inner circumference of the cross section, such that a density of the field windings in at least one first region formed around a stator circumference is smaller than in an adjacent second region.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: March 22, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Ludwig Schoen, Florian Esenwein
  • Patent number: 7872386
    Abstract: A motor includes a stator core that forms a magnetic path and has a plurality of tooth parts along a circumferential direction; a tooth provided in each tooth part to wind a coil there around; and an extension part alternated with the tooth part along a circumferential direction of the stator core, convexly extending to an inner radial direction.
    Type: Grant
    Filed: March 2, 2007
    Date of Patent: January 18, 2011
    Assignee: LG Electronics Inc.
    Inventor: Ho Jae Lee
  • Patent number: 7839045
    Abstract: A permanent magnet motor is provided. The permanent magnet motor includes a stator having a stator shaft having an outer surface, K salient teeth formed upon the outer surface, and K winding slots formed among the K salient teeth, and a rotor having a first inner surface facing the outer surface, and P pairs of permanent magnets formed on the first inner surface, each of which has a second inner surface facing the outer surface and at least a groove formed on the second inner surface to reduce a cogging torque.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: November 23, 2010
    Assignee: Delta Electronics, Inc.
    Inventors: Lijian Wu, Wanbing Jin, Jianping Ying, Shih-Ming Huang, Wen-Shi Huang
  • Patent number: 7830053
    Abstract: A motor includes a stator core that forms a magnetic path and has a plurality of tooth parts along a circumferential direction; a tooth provided in each tooth part to wind a coil there around; and an extension part alternated with the tooth part along a circumferential direction of the stator core, convexly extending to an inner radial direction.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: November 9, 2010
    Assignee: LG Electronics Inc.
    Inventor: Ho Jae Lee
  • Patent number: 7816836
    Abstract: A reduced stress rotor tip fillet that may be utilized in generators and motors as well as other types of rotating equipment is disclosed herein. The rotor tip fillet may reduce stress via an inventive fillet configuration positioned between intersecting rotor faces.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: October 19, 2010
    Assignee: Honeywell International Inc.
    Inventor: Dwayne E Burnett
  • Publication number: 20100194234
    Abstract: A reduced stress rotor tip fillet that may be utilized in generators and motors as well as other types of rotating equipment is disclosed herein. The rotor tip fillet may reduce stress via an inventive fillet configuration positioned between intersecting rotor faces.
    Type: Application
    Filed: January 30, 2009
    Publication date: August 5, 2010
    Inventor: Dwayne E. Burnett
  • Patent number: 7732963
    Abstract: A small-sized motor includes a field magnet attached to an inner circumferential surface of a metallic motor casing and having four or more magnetic poles. The field magnet is formed of a single ring-shaped magnet member having a predetermined thickness with respect to the radial direction and a predetermined length with respect to the thrust direction. At each of portions between the magnetic poles formed through magnetization, the magnet member has a thin portion having a reduced thickness with respect to the radial direction, the thin portion being formed by cutting the magnet member from the radially outward side. The magnetization is performed in the radial direction so as to alternately form S poles and N poles in the circumferential direction. At each of portions between the magnetic poles, the magnet member may have cut portions formed at opposite end portions of the magnet member with respect to the thrust direction.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: June 8, 2010
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Satoshi Iizuka, Mitsushi Kinoshita
  • Patent number: 7598635
    Abstract: A rotor for a dynamo electric machine comprises a rotor body 12 defining a plurality of poles in the form of limbs 16 around which windings 18 are provided, and a wedge arrangement 20 spanning the space 42 between adjacent limbs 16 and serving to secure the windings 18 in position, and a discharge passage 44 for delivering coolant to the said space.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: October 6, 2009
    Assignee: Goodrich Control Systems Limited
    Inventors: Darren Christopher Howard, Lyndon Paul Fountain
  • Patent number: 7592729
    Abstract: A three-phase machine has a primary part having N grooves and m electrical phase windings; a secondary part having a number p of pole pairs (P1-P4), each comprised of two magnetic poles of different polarities; wherein the pole gap is essentially the same for all of the pole pairs (P1-P4) and results from an even distribution of all of the poles on the secondary part; and at least one pole pair (P1-P4), with no change to its pole gap, is shifted by a predetermined distance in relation to an equidistant distribution of all of the pole pairs.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: September 22, 2009
    Assignee: Rexroth Indramat GmbH
    Inventor: Ingo Hahn
  • Publication number: 20090230804
    Abstract: A rotor assembly for an electromechanical machine includes a rotor core, an outer sleeve and an inner sleeve. The rotor core includes an outer diameter, and the outer sleeve is positioned about the outer diameter. The inner sleeve is positioned between the rotor core and the outer sleeve. One of the outer sleeve and the inner sleeve dampens electromagnetic flux generated by the rotor assembly.
    Type: Application
    Filed: February 28, 2008
    Publication date: September 17, 2009
    Inventors: Craig R. Legros, Laurence D. Vanek
  • Patent number: 7579745
    Abstract: A rotor is operable to rotate in a rotating direction, and is provided with five teeth that define five slots therebetween at regular intervals in the rotating direction. A pair of arc-shaped magnets surrounds the rotor, and faces each other through the rotor. A value of a circumferential angle between two adjacent slots with respect to an axis of the rotor is defined as a. A value of a circumferential angle between opposite end edges of an inner surface of the magnet in a circumferential direction of the magnet, which faces the rotor, with respect to the axis of the rotor is defined as b. The value of b falls within a range from 23 to 25 when the value of a is assumed as 12.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: August 25, 2009
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Kensuke Yamada, Yuuki Takahashi, Masami Ito, Takeo Miyajima
  • Publication number: 20090121583
    Abstract: A combination of a unique construction format, involving two sets of rotor and stator embodiments, working in co-operation with each other, in a unique fixed, direct-axis and quadrature-axis orientation, and with unique field-winding, back-EMF cancellation, connection schemes to substantially negate the field-winding harmonic currents in the field-winding excitation circuits, and provide for a substantially square-wave shaped, open-terminal, armature output-voltage characteristic.
    Type: Application
    Filed: November 14, 2007
    Publication date: May 14, 2009
    Inventor: Larry Llewellyn Smith
  • Patent number: 7518332
    Abstract: A brushless synchronous motor is provided in a simple configuration and at a low cost. The brushless synchronous motor comprises a rotor having salient magnets arranged in a circumferential direction, a stator having driving magnetic poles arranged in the circumferential direction, and an exciting coil wound around each driving magnetic pole, where the rotor is made in a non-circular profile. For example, the rotor may comprise a cylindrical body which has at least one flat surface perpendicular to one magnetic pole direction of the rotor, or a cylindrical body having an elliptic profile with a longer diameter in one magnetic pole direction of the rotor. A detector circuit is associated with each of a predetermined number of exciting coils for outputting a detection signal indicative of the impedance of the exciting coil in accordance with the distance between the driving magnetic pole and rotor, to detect a rotating angle of the rotor.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: April 14, 2009
    Assignee: Ebara Corporation
    Inventors: Toshiharu Nakazawa, Atsushi Ooyama
  • Publication number: 20090083966
    Abstract: A salient pole machine and method of forming the same comprising a rotating field assembly and at least one inter-pole cap connected to the rotating field assembly and/or at least end coil cap connected to the rotating field assembly. Each inter-pole cap preferably includes a top surface that has a curvature and/or at least one cavity. Each end coil cap may include at least one support. The salient pole machine may also include at least one fan assembly independent of the rotating field assembly. In a preferred embodiment, the salient pole machine includes at least one mounting plate, wherein each fan assembly is mounted on the mounting plate. The inter-pole caps and the end coil caps preferably comprise composites, polymers, alloys, ceramics, or naturally occurring materials.
    Type: Application
    Filed: October 2, 2007
    Publication date: April 2, 2009
    Applicant: EMERSON ELECTRIC CO.
    Inventors: Joseph B. McCabe, Brian N. Cox, Louis R. Myers, Jacques Andre Saint-Michel, John T. Fowler, Jerhod T. Smithback, Josh A. Lorenz
  • Patent number: 7511401
    Abstract: A rotor of a motor includes: a stator; a rotor core of a certain shape; a winding coil wound on the rotor core; and a rotor rotated by an electromagnetic interaction with the stator, in which both sides of an end wall of each slot of the I rotor core where the winding coil is inserted are respectively provided with a corner portion to connect both lateral walls of each slot. As a result, the effective area of a flux is increased thereby to decrease flux resistance and to reduce a stacked height of the rotor, that is, the number of stacked thin plates.
    Type: Grant
    Filed: January 26, 2006
    Date of Patent: March 31, 2009
    Assignee: LG Electronics Inc.
    Inventors: Tae-weon Yang, Chang-Sub Kim
  • Patent number: 7451538
    Abstract: In accordance with one embodiment, the present technique provides an apparatus for assembling a rotor. The exemplary apparatus includes a base that has a central aperture and a seating surface for receiving the rotor. An arbor then extends through the central aperture, the arbor having a longitudinal axis that is substantially orthogonal to the seating surface, and including threaded ends opposite with respect to one another. The exemplary apparatus also includes at least one member of a family of fixtures coupleable to the arbor, the family including a pressure fixture that has first and second piston assemblies disposed at diametrically opposite locations to one another, the family also including a support fixture coupleable the arbor and having members extending axially therefrom, the members being configured to support securing members of the rotor.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: November 18, 2008
    Assignee: Reliance Electric Technologies, LLC
    Inventor: William P. Pizzichil
  • Publication number: 20080224562
    Abstract: A DC motor, has a stator housing accommodating a permanent magnet stator; a rotor, rotatably mounted confronting the stator, the rotor having a shaft, a rotor core fitted to the shaft and having asymmetric laminations, a commutator fitted to the shaft adjacent one end of the rotor core, and windings wound about poles of the rotor core and terminated on the commutator; and brush gear comprising brushes in sliding contact with the commutator for transferring electrical power to the windings, wherein the cogging torque order for the motor is greater than twenty. Preferably, the cogging torque order is 28, 36 or 44.
    Type: Application
    Filed: March 14, 2008
    Publication date: September 18, 2008
    Inventors: Ray Qin, Jiyu Liang
  • Patent number: 7414348
    Abstract: A rotating electric machine armature core is configured by combining such a number of magnetic tooth sections that corresponds to the number of magnetic poles, each of the magnetic tooth sections including a plurality of first sheet members each of which includes a magnetic tooth portion formed at one end and a root portion formed at the other end with an end face of the root portion having a prescribed external shape, and at least one second sheet member inserted between the individual first sheet members in a laminating direction thereof at a location different from the locations of the other sheet members, the second sheet member including the magnetic tooth portion formed at one end and an overlapping portion formed at the other end, the overlapping portion forming a back yoke portion together with the root portion with a through hole formed at a specified position in the overlapping portion, the overlapping portion jutting out from the root portion in such a manner that the overlapping portion can fit on
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: August 19, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuyuki Yamamoto, Kei Yonemori
  • Publication number: 20080179987
    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: Application
    Filed: January 10, 2008
    Publication date: July 31, 2008
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tomoya IMAZU, Tsutomu TANIMOTO
  • Patent number: 7394178
    Abstract: A generator rotor structure comprises a cylinder body, at least a magnetic member, and a shaft. A penetrating bore is adapted at the center of the cylinder body. A plurality of containing spaces is adapted between the sidewall of the penetrating bore and the outer sidewall of the cylinder body. The adjacent containing spaces include a connecting part. The shaft passes through the penetrating bore, and the magnetic member is adapted on the outer sidewall of the cylinder body. The present invention can also be implemented according to another embodiment of the present invention, which comprises a hollow body, at least a connecting part, at least a shaft sleeve, at least a magnetic member, and a shaft. The connecting part is connected on the inner sidewall of the hollow body, and the shaft sleeve is connected to the connecting part. In addition, the shaft passes through the shaft sleeve, and the magnetic member is adapted on the outer sidewall of the hollow body.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: July 1, 2008
    Assignee: Atomic Energy Council-Institute of Nuclear Energy Research
    Inventors: Tao-Pang Hsiung, Wen-Hsien Chuang