Axially Offset And Radially Magnetized Magnets Patents (Class 310/156.25)
  • Patent number: 10389202
    Abstract: A contaminant-resistant motor may include an endbell with hermetic sealing of control components within a control module cavity in the endbell. The endbell configuration includes a front wall that isolates the control module cavity from contaminant-prone area of the motor assembly. The stator leads may be sealed within the lead passages using glass or other seals to further isolate the stator leads and control module cavity against ingress of contaminating liquids from the motor interior. The endbell configuration permits larger bearing elements to be used. A method of assembly of the motor may involve first fixture to align the stator, housing and REB to ensure concentric alignment of the stator to housing and the REB to the housing and a second fixture to isolate front and rear bearing bores and the stator inner diameter from encapsulation material and permit the stator to be molded to the housing.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: August 20, 2019
    Assignee: American Precision Industries, Inc.
    Inventors: William A. Albee, Andrew R. Sharp, Jerry Vitale
  • Patent number: 10312775
    Abstract: An integrated container-type torque-driven electric sensor for a vehicle motor is provided. Disposed on a motor housing along the direction of a motor shaft is a hollow cavity formed by a ring-shaped protrusion; contained in the hollow cavity is a fixed guiding slip ring; the fixed guiding slip ring dynamically matches with a floating sensor ring assembly having ratchet teeth and a magnetic steel piece; the ratchet teeth of a flywheel mating with the cogging distributed in a ring shape in a sensor ring having ratchet teeth; disposed on the motor shaft is a Hall element, the magnetic steel piece cooperating with the Hall element by means of magnetic induction, thereby outputting an electric signal to control a vehicle to enhance the force for rotation. For this motor, all Hall elements are disposed on the motor's housing, thereby solving the conflict between functional configurations and limited accommodation, and enabling significant magnetic induction effects.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: June 4, 2019
    Assignee: WUXI HIGH MINDED INDUSTRIAL DESIGN CO., LTD.
    Inventor: Huan Wang
  • Patent number: 10090742
    Abstract: A rotating electric machine includes at least one multi-phase coil, at least one armature core having the at least one multi-phase coil wound thereon, and at least one rotor rotatably disposed and having a plurality of magnetic poles facing the at least one armature core. The at least one multi-phase coil has at least one coil end part protruding from the at least one armature core and surrounded by at least one magnetic circuit formed in the rotating electric machine. There are a plurality of gaps formed between the at least one armature core and the at least one rotor.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: October 2, 2018
    Assignee: DENSO CORPORATION
    Inventor: Shin Kusase
  • Patent number: 10017054
    Abstract: An electric wheel, a remote controller, a vehicle using the electric wheel, and a method for driving a vehicle are disclosed. The electric wheel include a fixed wheel hub, a rotary wheel hub, a tire, a driving motor, and a battery and control unit. The fixed wheel hub may be connected with a vehicle shaft. The rotary wheel hub is mounted on the fixed wheel hub, with an accommodating cavity defined therebetween. The tire is attached around the rotary wheel hub. The driving motor is received in the accommodating cavity and configured to drive the rotary wheel hub. The battery and control unit is received in the accommodating cavity and configured to supply power to the driving motor and control operation of the driving motor. The battery and control unit comprising an embedded power supply to supply the power to the driving motor.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: July 10, 2018
    Assignee: Shenzhen Geniusmart Technologies Co. Ltd
    Inventor: Jun Wu
  • Patent number: 9905986
    Abstract: The invention relates to an assembly tool for releasing a latch element of a plug that is latchingly connected to a jack, having a tool shaft and a head part arranged on the tool shaft. The head part includes two side walls disposed parallel to one another. The side walls are arranged on a profile top side of a bottom part. On a side of the side walls 5 opposite the profile top side of the bottom part, wall strips are arranged facing to one another and spaced from one another disposed parallel to the bottom part so that a receiving space for the plug is enclosed by the bottom part, the side walls and the wall strips, which space includes an opening formed between the wall strips. A cable connected to the plug can be introduced into the receiving space 8 through the opening.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: February 27, 2018
    Assignee: GB GMBH—BSS
    Inventor: Adalbert Bierbaum
  • Patent number: 9812915
    Abstract: A rotor for a rotary electric machine includes a rotor core being rotatable around a rotational axis. The rotor core includes a plurality of steel plates stacked in a stacking direction. Each of the plurality of steel plates includes a plurality of magnet insertion piece holes, a plurality of through piece holes, a radially inner side annular ring, a radially outer side annular ring, and a plurality of ribs. The plurality of magnet insertion piece holes are provided at every first circumferential space. The plurality of magnet insertion piece holes constitute a plurality of magnet insertion holes in a state in which the plurality of steel plates are stacked in the stacking direction while the plurality of steel plates are rotated by the first circumferential space at every timing at which a predetermined number of the plurality of steel plates are stacked in the stacking direction.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: November 7, 2017
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Manabu Yazaki
  • Patent number: 9709339
    Abstract: A magnetic heat sink device and a heat removal method employs a heat sink device having a base assembly and a handle which extends in upright fashion from the base assembly. The base assembly has an array of fins. Magnets are received in holders of the base assembly and are magnetically bondable to an underlying metal attachment member so that the array of fins is in thermal communication with the member. Heat in the vicinity of the member is conducted to the fins and dissipated from the fins into the ambient environment.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: July 18, 2017
    Assignee: Handy & Harman
    Inventor: Peter J. Shadwell
  • Patent number: 9627836
    Abstract: A SFP tool can include a tool body with an installer key slidingly engaged with the tool body and/or an extractor key slidingly engaged with the tool body. The installer key can include one or more port engagers at a distal end of the installer key to engage with one or more corresponding ports in a SFP for installing the SFP into a SFP slot in a networking device. To remove a SFP from a SFP slot of a networking device, a bail engager pivotally coupled to an extractor key at a distal end of the extractor key can be engage and unlock a bail on the SFP. The SFP can be removed by moving a extractor key handle away from the networking device and/or the pressure can be applied to the extractor key handle and the SFP tool can be pulled away from the networking device.
    Type: Grant
    Filed: June 17, 2014
    Date of Patent: April 18, 2017
    Assignee: Cisco Technology, Inc.
    Inventor: Warren Marble
  • Patent number: 9509180
    Abstract: A brushless motor for the electric power tool is configured such that a rotor having a magnet is radially disposed on the inner side of a stator having winding wires, and a bonded magnet is used as the magnet of the rotor.
    Type: Grant
    Filed: November 28, 2011
    Date of Patent: November 29, 2016
    Assignee: MAKITA CORPORATION
    Inventors: Kenichi Ota, Masanori Higashi
  • Patent number: 9369011
    Abstract: An electric machine that includes a permanent-magnet rotor and a stator. The stator includes a plurality of poles, each pole having a leading edge and a trailing edge relative to the direction of rotation of the rotor. The leading edge of each pole is thicker than the trailing edge in a direction normal to the rotational axis of the rotor.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: June 14, 2016
    Assignee: Dyson Technology Limited
    Inventors: Stephen Greetham, Andrew Charlton Clothier
  • Patent number: 9018891
    Abstract: A motor includes a frame, a shaft rotatably mounted onto the frame, and at least one disc mounted onto the shaft. At least one permanent magnet is mounted on the disc, and at least one electromagnet and at least one coil are mounted to the frame in rotational magnetic proximity to the permanent magnet. A battery is connectable to the electromagnet and the coil for energizing the electromagnet and for receiving electrical current from the coil for charging the battery. A relay switch controls the transmission of electrical power from the battery to the electromagnet. A sensor generates a signal to the relay switch to activate electrical power to the electromagnet upon sensing that the permanent magnet is positioned with respect to the electromagnet such that a magnetic force generated by the electromagnet would be effective for inducing movement of the permanent magnet and consequent rotation of the disc.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: April 28, 2015
    Inventor: Clifford R. Rabal
  • Patent number: 8987964
    Abstract: A BLDC electric motor assembly (24) includes a rotor (42) having a plurality of magnet segments (50) securely retained thereabout by an annular ring (68) which is shrunk in situ in an electromagnetic forming operation. The magnet segments (50) are formed with tongues (62, 64) on their upper and lower ends (56, 58). One tongue (64) seats in a retaining pocket (48) molded on the rotor shaft (40), whereas the other tongue (62) provides a ledge into which the ring (68) seats. After the magnet forming operation, wherein the ring (68) is shrunk, the outer surface of the ring (68) is flush with the outer surfaces (54) of the magnet segments (50).
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 24, 2015
    Assignee: Carter Fuel Systems, LLC
    Inventor: Kyle Dean Achor
  • Publication number: 20150015107
    Abstract: Spatially mutually close pole components are offset with respect to one another such that their influences on a given harmonic of the vibrations occurring during operation cancel one another as much as possible. The present invention therefore suggests concepts and makes dimensioning proposals by means of which certain harmonic orders of the operating noise can be reduced.
    Type: Application
    Filed: September 29, 2014
    Publication date: January 15, 2015
    Inventors: Julian BLUM, Reinhard DOERFER, Joerg MERWERTH, Zhiwei ZHENG, Michael SCHWARZER
  • Patent number: 8760026
    Abstract: A rotor includes first and second permanent magnets provided in each magnetic pole inside a rotor core. The rotor is configured such that when a first end of the first permanent magnet located on the outer circumferential side of the rotor core and the second permanent magnet side is located at a position that faces a first end in the circumferential direction of one of teeth of a stator, a second end of the first permanent magnet located on the axis of rotation side of the rotor core and the second permanent magnet side is located at a position that faces a second end in the circumferential direction of the tooth that faces the first end of the first permanent magnet.
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: June 24, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Takeo Suzuki, Akihiko Maemura, Yosuke Kawazoe, Yuto Fukuma, Kenji Tomohara
  • Patent number: 8648511
    Abstract: A magnetic component part for a rotor assembly of an electromechanical transducer is provided. The magnetic component part includes a base element having a first side and an opposing second side, a permanent magnet, attached to the base element at the first side, and a mounting structure fixed to the base element at the second side and adapted to be mechanically connected to a support structure of the rotor assembly. The permanent magnet is located in an offset position with respect to a central axis of the mounting structure, which central axis extends from the mounting structure through the second side to the first side. A rotor assembly, an electromechanical transducer and a wind turbine, which are all equipped with at least four magnetic component parts are also provided as well as a method for manufacturing a rotor assembly including at least four magnetic component parts.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: February 11, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventors: James Kenneth Booth, Soeren Gundtoft
  • Patent number: 8614532
    Abstract: The present invention relates to a permanent-magnet synchronous motor, particularly an electric three-phase motor, comprising a stator having a stator yoke in which stator teeth with interposed stator grooves are arranged, wherein on each stator tooth at least one winding is provided, further comprising a rotor having permanent magnets, wherein the stator teeth are arranged in layers as disks in the axial direction of the stator and designed at least as two different disks, wherein the stator teeth in a first disk are connected peripherally among each other at the ends thereof pointing toward the rotor in the form of a stator star by a connecting bridge and in a second disk have an interruption instead of the connecting bridge. The present invention further relates to an electric power-assisted steering system.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: December 24, 2013
    Assignee: Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Wurzburg
    Inventors: Grzegorz Ombach, Jacek Junak, Horst Steegmueller
  • Patent number: 8384262
    Abstract: A motor rotor includes an annular body and a plurality of magnetic bodies installed on an inner lateral surface of the annular body in an irregular manner, to prevent a rotating motor from generating a cogging effect, disperse the frequency of the cogging torque, and reduce the amplitude. Accordingly, noises generated while the motor is operating are reduced, the periodicity of a cogging torque is changed, and cogging torque is reduced.
    Type: Grant
    Filed: June 17, 2010
    Date of Patent: February 26, 2013
    Assignee: Fairchild Semiconductor Incorporated
    Inventors: Shih-Jen Yang, Hung-Sen Tu, Chen-Chia Yang
  • Publication number: 20120280588
    Abstract: A rotating device having a stator and rotor, in which paired arcs of staggered magnets are affixed to the rotor surface, such that the staggered magnets are off-set the center-line of the rotor. Stator magnets, located on the stator, are also affixed in an off-set manner. During rotation, the repulsive interaction between stator and rotor magnets is off-set the centreline of the rotor, resulting in a tangential force on the rotor, which imparts angular momentum on the rotor, thereby inducing rotation.
    Type: Application
    Filed: November 26, 2010
    Publication date: November 8, 2012
    Inventor: Thomas Patrick Bryson
  • Publication number: 20120274160
    Abstract: A rotary electric machine includes a stator having stator windings; and a rotor rotatably disposed in the stator, said rotor having a rotor core provided with a plurality of magnets and a plurality of magnetic auxiliary salient poles formed between poles of the magnets. In this rotary electric machine: a magnetic air gap is provided in an axial direction of the rotor in a position shifted in a circumferential direction from a q axis passing through a center of the magnetic auxiliary salient pole within the magnetic auxiliary salient pole; and an amount of shifting the magnetic air gap from the q axis in the circumferential direction differs according to a position of the magnetic air gap in the axial direction so as to cancel torque pulsation in energization caused due to the magnetic air gap.
    Type: Application
    Filed: July 13, 2012
    Publication date: November 1, 2012
    Applicant: Hitachi, Ltd.
    Inventors: Noriaki Hino, Yutaka Matsunobu, Shinji Sugimoto, Akinori Kamiya
  • Patent number: 8084911
    Abstract: A motor including a stator and a rotor is disclosed. The rotor includes a first unit and a second unit. The first unit includes an N-pole first magnet and an S-pole second magnet. The first and the second magnets are alternately arranged along a circumferential direction of the rotor at equal angular intervals to form magnetic pole portions. The second unit includes an N-pole or S-pole third magnet and a salient pole arranged in the rotor core. The salient pole functions as a magnetic pole that differs from the third magnet. The third magnet and the salient pole are alternately arranged along the circumferential direction of the rotor to form magnetic pole portions. The number of magnetic pole portions of the second unit is the same as the number of magnetic pole portions of the first unit. The third magnet and the magnet of the first unit having the same pole as the third magnet are aligned in the axial direction of the rotor.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: December 27, 2011
    Assignee: Asmo Co., Ltd.
    Inventors: Yoshiaki Takemoto, Seiya Yokoyama, Yoji Yamada, Shigemasa Kato, Yoko Tateishi
  • Patent number: 7965008
    Abstract: A servo motor, comprising a stator and a rotor disposed within the stator. The rotor has a core and magnets, covering the periphery of the core, forming a plurality of axially extending rotor poles. The rotor poles comprise a plurality of the magnets arranged axially, and the centers of adjacent magnets of a rotor pole are staggered by a mechanical angle in the circumferential direction of the rotor.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: June 21, 2011
    Assignee: Johnson Electric S.A.
    Inventors: Ji Dong Chai, Bao Ting Liu, Wen Liang Li, Zhi Duan Shao
  • Patent number: 7948137
    Abstract: A rotor includes a core extending in a predetermined direction, and a plurality of magnets. The core has parts formed by magnetic materials and extending in the predetermined direction. The parts are arranged in a loop around the part, and face the part through gaps. The magnets are buried in the gaps in the form of a loop in the core. The magnets have pole faces extending in the predetermined direction. In each of the magnets, at least one of ends of the magnet protrudes forward in parallel to the predetermined direction with respect to an end of the part that is on the same side with the at least one of the ends of the magnet.
    Type: Grant
    Filed: January 26, 2006
    Date of Patent: May 24, 2011
    Assignee: Daikin Industries, Ltd.
    Inventors: Kazunobu Ohyama, Shin Nakamasu, Yoshinari Asano, Toshinari Kondo, Keiji Aota
  • Patent number: 7928622
    Abstract: In a brushless motor including a rotor having 2n magnetic poles and a stator having 3n slots, the magnetic poles of the rotor are composed of segment magnets arranged in three columns extending in an axial direction. The magnets of each column are displaced from the magnet of either adjacent column in a circumferential direction, forming a 3-stage step-skew structure. The segment magnets have a skew angle ?skew ranging from 36° to 57° in terms of electrical angle.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: April 19, 2011
    Assignee: Mitsuba Corporation
    Inventor: Masayuki Okubo
  • Patent number: 7906880
    Abstract: In a brushless motor including a rotor having 2n poles and a stator having 3n slots, segment magnets are arranged in three columns in the axial direction, thus constituting rotor poles. The segment magnets of adjacent columns, which are identical in polarity, are displaced in the circumferential direction, thus forming a three-stage step-skew structure. The skew angle ?skew of each segment magnet is set to an electrical angle of 60° to 75°. The center angle of ?m of each segment magnet is set to 46.8° to 52.7°.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: March 15, 2011
    Assignee: Mitsuba Corporation
    Inventors: Masayuki Okubo, Mikio Kawamura
  • Publication number: 20100277026
    Abstract: A rotary electric machine comprising a rotor (30A) including a plurality of permanent magnets having magnetic poles and a stator (20A) including a plurality of tooth sections each having a front end portion which faces the rotor, wherein the rotor (30A) has a skew structure having a change section in which boundaries between the magnetic poles change with respect to a rotation axis direction, and the front end portion of each of the plurality of tooth sections of the stator (20A) has an auxiliary slot (24A) which is selectively formed in an extending manner at one portion of the front end portion in the rotation axis direction such that substantially a center of the auxiliary slot in the rotation axis direction is opposed to a center of the change section in the rotation axis direction, and no auxiliary slot is formed at portions located on extensions of the auxiliary slot in the rotation axis direction.
    Type: Application
    Filed: December 1, 2008
    Publication date: November 4, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shinichi Yamaguchi, Hisashi Otsuka, Haruyuki Hasegawa
  • Publication number: 20100219711
    Abstract: In the drive train of a combustion engine an auxiliary arrangement is arranged which is to be coupled with an axial flow machine comprising 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 neighbouring permanent magnet elements towards the air gap alternates.
    Type: Application
    Filed: June 26, 2008
    Publication date: September 2, 2010
    Applicant: COMPACT DYNAMICS GMBH
    Inventors: Andreas Gruendl, Bernhard Hoffmann, Stephan Steyer, Anton Wolf, Uwe Reichert
  • Patent number: 7642683
    Abstract: A self-regulating permanent magnet device has a first rotor segment and second rotor segment, each supporting a set of permanent magnets, wherein the position of the second rotor segment relative to the first rotor segment is modified based on the speed of the self-regulating permanent magnet device. By modifying the position of the second rotor segment relative to the first rotor segment, the alignment between their respective sets of permanent magnets, and therefore, the electromotive force (emf) generated in the stator coils is regulated. The position of the second rotor segment is defined by the connection of a torsion spring between the first rotor segment and second rotor segment and a reactionary torque device connected to the second rotor segment. The torsion spring creates a spring force that acts to maintain the alignment between the first rotor segment and the second rotor segment.
    Type: Grant
    Filed: December 6, 2006
    Date of Patent: January 5, 2010
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Theodore Clifton Powers, Michael Raymond Hernden, Mahesh J. Shah
  • Publication number: 20090322174
    Abstract: In a three-phase permanent-magnet synchronous machine, a pole gap and a skew of permanent magnets on the rotor are designed such that oscillating torques which are caused by the fifth and seventh harmonics of the stator field and of the rotor field are mutually reduced. In particular, the skew can be chosen as a function of the pole gap, such that the majority of the respective oscillating torques is neutralized. This results in minimal torque ripple.
    Type: Application
    Filed: June 26, 2009
    Publication date: December 31, 2009
    Applicant: Siemens Aktiengesellschaft
    Inventors: UDO GROSSMANN, ROLF VOLLMER, MICHAEL ZASTROW
  • Publication number: 20090267437
    Abstract: A servo motor, comprising a stator and a rotor disposed within the stator. The rotor has a core and magnets, covering the periphery of the core, forming a plurality of axially extending rotor poles. The rotor poles comprise a plurality of the magnets arranged axially, and the centers of adjacent magnets of a rotor pole are staggered by a mechanical angle in the circumferential direction of the rotor.
    Type: Application
    Filed: April 28, 2009
    Publication date: October 29, 2009
    Inventors: Ji Dong Chai, Bao Ting Liu, Wen Liang Li, Zhi Duan Shao
  • Patent number: 7608963
    Abstract: A rotor having a substantially cylindrical configuration for use in a brushless direct current electric motor having a high torque to size ratio. The rotor has an outer peripheral surface. The rotor also has a central rotor shaft and a first and second retaining ends mounted on the central rotor shaft and spaced from one another. The rotor also has a plurality of magnets configured to provide a magnetic flux with a stator disposed around the central rotor shaft. The magnets are radially disposed on the shaft and the rotor also has a sheath. The sheath is crimped around the radially disposed permanent magnets, and holds the magnets around the shaft. The sheath is lightweight and minimizes a gap between the permanent magnets and the stator to provide for an electromagnetic flux between the magnets and the stator windings, and for rotation of the central rotor shaft.
    Type: Grant
    Filed: May 7, 2007
    Date of Patent: October 27, 2009
    Inventors: Robert M. Jones, Joseph M. Lisiecki
  • Patent number: 7592730
    Abstract: A hybrid induction motor includes a motor casing; a rotational shaft rotatably coupled with the motor casing; an induction rotor rotated by being integrally coupled with the rotational shaft and having a rotor core and a conductor bar inserted in the rotor core; a stator having a hollow into which the induction rotor is inserted and installed with a certain length in a direction of the rotational shaft; a first magnetic rotor inserted between the stator and the induction rotor and coupled with the rotational shaft so as to be freely rotatable; a second magnetic rotor inserted between the stator and the induction rotor so as to be symmetrical with the first magnetic rotor and coupled with the rotational shaft so as to be freely rotatable; and a magnetic spacer inserted between the first and second magnetic rotors.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: September 22, 2009
    Assignee: LG Electronics Inc.
    Inventors: Seung-Do Han, Seung-Suk Oh, Hyoun-Jeong Shin
  • Publication number: 20090224621
    Abstract: In a brushless motor including a rotor having 2n poles and a stator having 3n slots, segment magnets arranged, in three columns, in the axial direction, thus constituting rotor poles. The segment magnets of adjacent columns, which are identical in polarity, are displaced in the circumferential direction, thus forming a three-stage step-skew structure. The skew angle ?skew of each segment magnet is set to an electrical angle of 60° to 75°. The center angle of ?m of each segment magnet is set to 46.8° to 52.7°.
    Type: Application
    Filed: March 3, 2009
    Publication date: September 10, 2009
    Inventors: Masayuki Okubo, Mikio Kawamura
  • Publication number: 20090224619
    Abstract: In a brushless motor includes a rotor having 2n magnetic poles and a stator having 3n slots, the magnetic poles of the rotor are composed of segment magnets arranged in three columns extending in an axial direction. The magnets of each column are displaced from the magnet of either adjacent column in a circumferential direction, forming a 3-stage step-skew structure. The segment magnets have a skew angle ?skew ranging from 36° to 57° in terms of electrical angle.
    Type: Application
    Filed: February 25, 2009
    Publication date: September 10, 2009
    Inventor: Masayuki OKUBO
  • Publication number: 20090224620
    Abstract: A brushless motor has rotor cores 15a to 15c dividedly formed into plurality in an axial direction, segment magnets 16a to 16c secured to outer circumferential surfaces of the rotor cores, and magnet holders 17a to 17c secured to the rotor cores, respectively, for holding the segment magnet. Each of the rotor cores 15a to 15c has holder-positioning grooves 20 to which holder arms 19 are fitted and bridge parts 32 formed corresponding to the holder positioning grooves 20. Each of the magnet holders 17b to 17c has joint grooves 34 fitted in the bridge parts 32 and displaced from the holder arms 19 by a step angle, the bridge parts 32 are fitted in the joint grooves 34, thereby assembling a rotor 3.
    Type: Application
    Filed: February 26, 2009
    Publication date: September 10, 2009
    Inventors: Masayuki Okubo, Satoru Negishi, Koji Nara, Takeshi Yamazaki
  • Publication number: 20090200884
    Abstract: An apparatus for converting between mechanical and electrical energy, particularly suited for use as a compact high power alternator for automotive use and “remove and replace” retrofitting of existing vehicles. Various aspects of the invention provide a means of significantly increasing the output of permanent magnet alternators while addressing the issues of radial loading applied to a permanent magnet alternator rotor. Another aspect of the invention allows for the production of power in two discrete voltages. An aspect of this invention allows for a marked increase in output capability without increasing axial length through the use of magnetic fringing. One aspect of the invention offers an effective means of mounting a skewed stack that eliminates or reduces cogging that is present in a permanent magnet machine without negatively impacting airflow. Another aspect of the invention reduces cogging by radially offsetting opposing magnets of a dual rotor permanent magnet machine.
    Type: Application
    Filed: February 9, 2009
    Publication date: August 13, 2009
    Inventors: Charles Y. Lafontaine, Harold C. Scott
  • Patent number: 7511395
    Abstract: A hybrid induction motor comprises a stator fixedly installed in a casing, an induction rotor rotatably inserted into a center of the stator and having a shaft at a center thereof, a first synchronous rotor slid in a longitudinal direction of the shaft between the stator and the induction rotor and free-rotatably installed in a circumferential direction of the shaft, and a second synchronous rotor facing the first synchronous rotor, slid in a longitudinal direction of the shaft between the stator and the induction rotor, and free-rotatably installed in a circumferential direction of the shaft.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: March 31, 2009
    Assignee: LG Electronics Inc.
    Inventors: Seung Do Han, Hyoun Jeong Shin, Jae Hong Ahn
  • Patent number: 7439644
    Abstract: A hybrid induction motor comprises a stator fixedly installed in a casing, an induction rotor rotatably inserted into a center of the stator and having a shaft at a center thereof, a first synchronous rotor installed between the stator and the induction rotor in a circumferential direction of the shaft so as to be freely rotatable, and a second synchronous rotor facing the first synchronous rotor in a longitudinal direction of the shaft and installed between the stator and the induction rotor so as to be freely rotatable.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: October 21, 2008
    Assignee: LG Electronics Inc.
    Inventors: Jeong-Chul Kim, Dong-Il Lee, Seung-Do Han, Hyoun-Jeong Shin, Jae-Hong Ahn, Seung-Suk Oh
  • Patent number: 7336007
    Abstract: A system and method are disclosed for controlling an integrated rotary-linear actuator system that may be coupled to a network via a network interface. The integrated rotary-linear actuator system includes a control system and a rotary-linear actuator having a moveable plunger and associated coils. The coils may be energized to interact with associated magnets to effect corresponding movement of the plunger, which may include rotation and/or linear movement. The network interface facilitates receipt of control information at the control system of the integrated rotary-linear actuator system from the network. The control system may control an amplifier to energize the coils based on the control information.
    Type: Grant
    Filed: April 9, 2007
    Date of Patent: February 26, 2008
    Assignee: Anorad Corporation
    Inventors: Anwar Chitayat, Mustansir Faizullabhoy
  • Publication number: 20080024028
    Abstract: An electric motor for reducing torque ripple includes a rotor, a plurality of magnets positioned about the rotor, and a stator including a plurality of stator teeth configured to form at least two slot openings each having a slot opening width wo and a slot opening height ho. One or more of the stator teeth include a dummy channel having a channel height wn and a channel width wb. At least one of the slot opening width wo, the slot opening height ho, the channel height wn, and the channel width wb, are selected so as to minimize or reduce cogging torque.
    Type: Application
    Filed: July 27, 2006
    Publication date: January 31, 2008
    Inventors: Mohammad S. Islam, Paul M. Fisher, Tomy Sebastian, Ramakrishnan Raja Venkitasubramony, Tom C. Wong
  • Publication number: 20070216252
    Abstract: A motor/generator is basically provided with a stator, a first rotor member and a magnetic resistance changing mechanism. The stator has a plurality of coils configured and arranged to be energized with a composite electrical current to form first and second magnetic fields. The first rotor member is configured and arranged to be rotated with respect to the stator using the first magnetic field. The magnetic resistance changing mechanism is configured and arranged to change a magnetic resistance between the stator and the first rotor member using the second magnetic field.
    Type: Application
    Filed: March 12, 2007
    Publication date: September 20, 2007
    Applicant: Nissan Motor Co., Ltd.
    Inventor: Yuichi SHIBUKAWA
  • Publication number: 20070216248
    Abstract: A hybrid induction motor includes a motor casing; a rotational shaft rotatably coupled with the motor casing; an induction rotor rotated by being integrally coupled with the rotational shaft and having a rotor core and a conductor bar inserted in the rotor core; a stator having a hollow into which the induction rotor is inserted and installed with a certain length in a direction of the rotational shaft; a first magnetic rotor inserted between the stator and the induction rotor and coupled with the rotational shaft so as to be freely rotatable; a second magnetic rotor inserted between the stator and the induction rotor so as to be symmetrical with the first magnetic rotor and coupled with the rotational shaft so as to be freely rotatable; and a magnetic spacer inserted between the first and second magnetic rotors.
    Type: Application
    Filed: December 19, 2006
    Publication date: September 20, 2007
    Applicant: LG ELECTRONICS INC.
    Inventors: Seung-Do HAN, Seung-Suk OH, Hyoun-Jeong SHIN
  • Publication number: 20070188036
    Abstract: A motor/generator includes a rotor member, a shorting member and a stator. The rotor member has a plurality of permanent magnets. The shorting member is configured and arranged to selectively establish a short-circuit in magnetic flux of the permanent magnets to switch between a normal state in which the magnetic flux is not shorted and a shorted state in which the magnetic flux is shorted. The stator has a plurality of coils configured and arranged to be energized with a composite electrical current including first and second current components. The stator is further configured and arranged to form a first magnetic circuit between the coils and the permanent magnets with the first current component to drive the rotor member and to form a second magnetic circuit between the coils and the shorting member with the second current component to selectively switch between the normal state and the shorted state.
    Type: Application
    Filed: February 12, 2007
    Publication date: August 16, 2007
    Applicant: Nissan Motor Co., Ltd.
    Inventor: Yuichi Shibukawa
  • Patent number: 7245054
    Abstract: A permanent magnet electric machine includes a stator with salient stator poles. A rotor includes two or more axial rotor sections that are rotationally offset by an offset angle equal to the cogging angle divided by the number of axial rotor sections. The axial rotor sections include rotor poles with permanent magnets. In one embodiment, the permanent magnet electric machine has a 12/10 slot/pole combination. The permanent magnets have a magnet dimension angle between 31 and 35 degrees. An air gap ratio of the electric machine is between 1.35 and 2.5. A slot opening ratio of the electric machine is less than or equal to one. In another embodiment, the permanent magnet electric machine has an 18/12 slot/pole combination. The permanent magnets have a magnet dimension angle that is between 25 and 28 degrees. An air gap ratio of the electric machine is between 1.35 and 2.5. A slot opening ratio of the electric machine is less than or equal to one.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: July 17, 2007
    Assignee: Emerson Electric Co.
    Inventors: Todd A. Walls, Alan D. Crapo
  • Patent number: 7218017
    Abstract: A system and method are disclosed for controlling an integrated rotary-linear actuator system that may be coupled to a network via a network interface. The integrated rotary-linear actuator system includes a control system and a rotary-linear actuator having a moveable plunger and associated coils. The coils may be energized to interact with associated magnets to effect corresponding movement of the plunger, which may include rotation and/or linear movement. The network interface facilitates receipt of control information at the control system of the integrated rotary-linear actuator system from the network. The control system may control an amplifier to energize the coils based on the control information.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: May 15, 2007
    Assignee: Anorad Corporation
    Inventors: Anwar Chitayat, Mustanzir Faizullabhoy
  • Patent number: 7071592
    Abstract: A rotor for motor is disclosed to have a plurality of protruding portions arranged in two rows around the periphery of the body thereof and spaced by magnetic gaps, and a plurality of magnets of semicircular cross section respectively covered on the protruding portions and respectively abutted with one end of each of the magnets at one row against two adjacent magnets at the other row.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: July 4, 2006
    Inventor: Yi-Tang Lu
  • Patent number: 6958556
    Abstract: A stepping motor having a rotor that includes a magnetic component whose circumferential part is magnetized in multipole along the circumferential surface thereof, the stepping motor being capable of forcing the rotor to rotate by magnetic force provided between magnetic poles of the rotor and excited salient poles of a stator, in which the magnetic component includes two magnetic component portions each shaped as an approximate ring, and the two magnetic component portions are either combined with each other or set up separately at an appropriate spacing between them. The stepping motor is capable of rotating with not only high speed but also less undesired vibration and noises, and enabling a simpler, smaller manufacturing equipment thereof to be constructed.
    Type: Grant
    Filed: March 24, 2003
    Date of Patent: October 25, 2005
    Assignee: Minebea Co., Ltd.
    Inventors: Soichi Kurosawa, Akio Kanazawa, Naohiro Yoshida
  • Patent number: 6891287
    Abstract: An alternating current motor may include a rotor configured to rotate about a longitudinal axis, the rotor comprising a diametrically magnetized permanent magnet. Furthermore, the alternating current motor may include stationary coils having a magnetic axis substantially perpendicular to the rotor's longitudinal axis, the stationary coils adapted to the rotor's outer periphery and being substantially coaxial with the rotor's longitudinal axis. In addition, the alternating current motor may include a stator adapted to the stationary coils' outer periphery and being substantially coaxial with the rotor's longitudinal axis, wherein the diametrically magnetized permanent magnet is configured to cause the rotor's oscillation angle to vary no more than 30% between the rotor's oscillation angle at a beginning value of a frequency range of an alternating current in the stationary coil and the rotor's oscillation angle at an ending value of the frequency range of the alternating current in the stationary coil.
    Type: Grant
    Filed: July 17, 2003
    Date of Patent: May 10, 2005
    Assignee: Les Produits Associes LPA, S.A.
    Inventor: Michel-Antoine C. Moret
  • Publication number: 20040251759
    Abstract: A radial gap, transverse flux dynamoelectric machine comprises stator and rotor assemblies. The rotor assembly comprises at least two axially spaced, planar rotor layers having equal numbers of magnetic poles of alternating polarity disposed equiangularly about the rotor peripheral circumference. A magnetically permeable member optionally links adjacent rotor magnets. The stator assembly comprises a plurality of amorphous metal stator cores terminating in first and second polefaces. The cores are disposed equiangularly about the peripheral circumference of the stator assembly with their polefaces axially aligned. Respective first and second polefaces are in layers radially adjacent corresponding rotor layers. Stator windings encircle the stator cores. The device is operable at a high commutating frequency and may have a high pole count, providing high efficiency, torque, and power density, along with flexibility of design, ease of manufacture, and efficient use of magnetic materials.
    Type: Application
    Filed: June 9, 2004
    Publication date: December 16, 2004
    Inventor: Andrew D. Hirzel
  • Publication number: 20040251761
    Abstract: A radial gap, transverse flux dynamoelectric machine comprises stator and rotor assemblies. The rotor assembly comprises at least two axially spaced, planar rotor layers having equal numbers of discrete rotor magnets disposed equiangularly about the rotor peripheral circumference with alternating north and south poles. A magnetically permeable member optionally links adjacent rotor magnets. The stator assembly comprises a plurality of amorphous metal stator cores terminating in first and second polefaces. The cores are disposed equiangularly about the peripheral circumference of the stator assembly with their polefaces axially aligned. Respective first and second polefaces are in layers radially adjacent corresponding rotor layers. Stator windings encircle the stator cores. The device is operable at a high commutating frequency and may have a high pole count, providing high efficiency, torque, and power density, along with flexibility of design, ease of manufacture, and efficient use of magnetic materials.
    Type: Application
    Filed: June 9, 2004
    Publication date: December 16, 2004
    Inventor: Andrew D. Hirzel
  • Publication number: 20040217665
    Abstract: An electric motor, particularly an electronically commutated direct current motor, has a stator and a rotor. The stator and the rotor are arranged coaxially to a longitudinal axis of the electric motor. The stator features a plurality of electrical stator poles and a plurality of phase windings. The rotor features a permanent magnet with a least one magnetic pole pair which is dedicated to the phase windings. The phase windings and/or the permanent magnet are divided into several axial sections in the direction of the longitudinal axis of the electric motor and these sections are staggered around the longitudinal axis of the electric motor with respect to each other. Angular positions of the individual phases are offset with respect to each other is in such a way that torque ripple can be reduced and torque gaps can be prevented.
    Type: Application
    Filed: February 3, 2004
    Publication date: November 4, 2004
    Applicant: Minebea Co., Ltd.
    Inventor: Helmut Hans