With An Axial End Clamp Patents (Class 310/156.22)
  • Patent number: 10821591
    Abstract: A cordless, hand-held power tool, such as a hammer drill/driver, an impact driver, an impact wrench, etc., that includes a brushless direct current (“BLDC”) motor. Each of the hand-held power tool includes a removable and rechargeable battery pack, electronics, and a BLDC motor that have been designed and balanced to produce high-performance-capable (e.g., high-power, high-current, high-torque) hand-held power tool. The hand-held power tool is capable of delivering high instantaneous (i.e., short duration) current to the BLDC motor for short-duration high power operation and high continuous (i.e., long duration) current to the BLDC motor for long duration high power operation. Additionally, the short and long duration power is capable of being provided in a smaller (in size) and lighter (in weight) package than any hand-held power tool before it.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 3, 2020
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: Brandon L. Verbrugge, Matthew J. Mergener, Matthew P. Wycklendt, Jeffrey C. Hessenberger, Dennis J. Grzybowski
  • Patent number: 10651696
    Abstract: A motor is provided. The motor includes a stator, a rotor rotatably disposed in the stator, and a motor shaft provided in the rotor to rotate integrally with the rotor. The rotor includes at least one permanent magnet fixing core, at least one injection fixing core alternately stacked with the at least one permanent magnet core in a direction of the motor shaft, a plurality of permanent magnets inserted at a predetermined interval in the at least one permanent magnet fixing core and the at least one injection fixing core, and an injection ring formed to cover the at least one permanent magnet fixing core, the at least one injection fixing core, and the plurality of permanent magnets. The at least one permanent magnet fixing core is formed to prevent the permanent magnets from becoming separated from the rotor by a centrifugal force, and the at least one injection fixing core is formed to prevent the injection ring from becoming separated from the rotor by the centrifugal force.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: May 12, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Won-ho Kim, Sung-hyuk Park, Seong-taek Lim, Woong Hwang
  • Patent number: 10560004
    Abstract: A sensor magnet holder is used to fix a sensor magnet to a motor shaft. The sensor magnet holder includes a press fitting part to which the motor shaft is press fitted; a holding part provided radially outside the press fitting part to hold the sensor magnet; and a joint part that joins the press fitting part and the holding part. The joint part is configured such that at least a part of the joint part is deflected by an external force.
    Type: Grant
    Filed: August 16, 2017
    Date of Patent: February 11, 2020
    Assignee: MABUCHI MOTOR CO., LTD.
    Inventors: Kazuyuki Yamamoto, Satoshi Kikuchi
  • Patent number: 10554083
    Abstract: A pump is provided with an electric motor that has a rotor. The rotor is provided with a shaft and a magnet surrounds the shaft. The magnet is connected with form fit to the shaft. A follower surrounds the shaft at least in some areas of the shaft. The follower is monolithically connected to the shaft or is connected with form fit to the shaft. The magnet is made of at least two magnet segments and the follower has projections which engage intermediate spaces formed between the magnet segments.
    Type: Grant
    Filed: February 14, 2016
    Date of Patent: February 4, 2020
    Assignee: OASE GmbH
    Inventor: Herbert Lambers
  • Patent number: 10476325
    Abstract: An inner-rotor motor and a rotor of the inner-rotor motor reduce noise or vibration generated during the rotation of the motor. The rotor includes a shaft, an iron core, a plurality of permanent magnets and a limiting member. The iron core includes a magnetic yoke portion coupled with an outer periphery of the shaft, as well as a plurality of magnetic pole portions circumferentially coupled with an outer periphery of the magnetic yoke portion. The iron core forms a plurality of receiving portions, and each receiving portion is formed between two adjacent magnetic pole portions. The permanent magnets are received in the receiving portions, respectively. The limiting member is arranged at one side of the iron core, and includes a covering face covering the permanent magnets in the axle direction of the shaft.
    Type: Grant
    Filed: September 23, 2016
    Date of Patent: November 12, 2019
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Chi-Min Wang, Ku-Ling Liu
  • Patent number: 10454323
    Abstract: An electric machine is presented. The electric machine includes a stator and a rotor disposed concentric to the stator. At least one of the rotor and the stator includes a core including a plurality of laminates stacked along the axial direction of the electric machine, where the stacked plurality of laminates defines a plurality of axial slots. The at least one of the rotor and the stator further includes a permanent magnet assembly disposed in one or more of the plurality of axial slots, where the permanent magnet assembly includes two or more permanent magnets disposed serially along the axial direction of the electric machine such that adjacently disposed permanent magnets overlap one another to form an overlapped interface. The overlapped interface spans at least two laminates of the plurality of laminates of the core.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: October 22, 2019
    Assignee: GE Oil & Gas ESP, Inc.
    Inventors: Manoj Ramprasad Shah, Nathaniel Benedict Hawes, James Pellegrino Alexander, Patel Bhageerath Reddy
  • Patent number: 10367388
    Abstract: The main motor for a railway vehicle is rotationally driven upon receiving an AC power supplied from an inverter circuit that includes a switching element formed by using a wide bandgap semiconductor. The inverter circuit applies a voltage having a PWM waveform to the main motor for a railway vehicle in at least part of a speed range of an electric vehicle. The stator of the main motor for a railway vehicle is configured to include an annular stator core provided with a plurality of slots in a circumferential direction and coils that are wound on the stator core and are accommodated in the slots, and includes a stator winding that is three-phase star-connected and is composed of parallel circuits the number of which is the same as the number of poles for each phase.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: July 30, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kenta Kaneko, Haruyuki Kometani
  • Patent number: 10308307
    Abstract: The present disclosure relates to a disk-type brushless direct current (BLDC) motor, which comprises a magnetic rotor and a stator. The magnetic rotor is provided with a rim and a plurality of equally spaced magnetic poles around the rim in circumferential direction. The stator is provided with a stator core having tooth portions and boot portions and a plurality of coil windings wrapped around the tooth portions. The stator is disposed radially in relation to the magnetic rotor such that the magnetic poles are radially polarized to produce radial magnetic flux density, and the magnetic flux density is substantially higher at both edges than middle portion of each magnetic pole in the circumferential direction.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: June 4, 2019
    Assignee: ALLIED TREASURE INC., LIMITED
    Inventor: Chi-Hsueh Richard
  • Patent number: 10284064
    Abstract: A BLDC motor includes a stator and a rotor. The rotor includes a shaft, first and second end plates, a plurality of cores arranged between the first and second end plates, a plurality of magnets, and a housing. The cores are evenly spaced from each other in the circumferential direction. A space is formed between neighboring cores. Each space receives one magnet. The magnets are magnetized circumferentially such that side surfaces of the magnets have corresponding polarities. The housing is made of magnetically permeable material, surrounding and covering radially outer ends of the magnets and cores.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: May 7, 2019
    Assignee: JOHNSON ELECTRIC INTERNATIONAL AG
    Inventors: Yong Bin Li, Long Shun Jiang, Xian Chun Fan
  • Patent number: 10177618
    Abstract: Some embodiments provided rotor assemblies, comprising: a rotor core barrel comprising a wall extending, and at least two compression bridges each formed in the wall proximate one of the lateral ends and separated by a distance; an array of a plurality of magnets positioned on and spaced along the wall between the compression bridges and about a circumference of the rotor core barrel; and one or more pre-stress wraps wrapped over the plurality of magnets and about the rotor core barrel along at least a portion of a length of the rotor core barrel between the compression bridges, wherein the compression bridges enable radial compression deflection, induced by radial compression of the rotor core barrel by the one or more pre-stress wraps, of the wall of the rotor core barrel at the compression bridges relative to the wall of the rotor core barrel proximate the lateral ends.
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: January 8, 2019
    Assignee: General Atomics
    Inventors: William P. Creedon, George T. Santamaria, John Charles Hirschy Wick
  • Patent number: 10056812
    Abstract: A three-phase permanent magnet electric motor-generator includes a stator having a plurality of teeth, each provided with a respective electric winding implemented by a conducting wire and with a respective heading polar expansion, divided into groups each one corresponding to a phase, by obtaining at the same time a reduced short-circuit current. The distance between adjacent polar expansions is the minimum one so as to allow the passage of a conducting wire. By identifying a first magnetic circuit comprising two adjacent teeth, the respective rotor and stator yokes, the thicknesses of the respective permanent magnets and the corresponding air gap, and a second magnetic circuit having two adjacent teeth, the respective rotor yokes, the respective halves of the faced polar expansions of said adjacent teeth and the distance between such polar expansions, the magnetic reluctances of the first and second circuit have the same order of magnitude.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: August 21, 2018
    Assignee: PIAGGIO & C. S.P.A.
    Inventors: Paolo Capozzella, Roberto Bernardini
  • Patent number: 9954415
    Abstract: A permanent magnet of a rotor core of a rotor includes a first recess and a second recess, which are formed in an outer wall to correct a dynamic balance of the rotor. The permanent magnet is a bonded magnet that is formed by molding a mixture material, which is a mixture of resin and magnetic powder. The first recess and the second recess are formed at the time of molding the permanent magnet. Furthermore, the first recess and the second recess are formed at two axial ends, respectively, of the permanent magnet.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: April 24, 2018
    Assignee: DENSO CORPORATION
    Inventors: Yuuji Hidaka, Masaya Ootake, Kiyoshi Nagata
  • Patent number: 9823308
    Abstract: A method for discovering demagnetisation faults of a permanent magnet synchronous generator, such as a wind power generator. The method is performed during operation of the synchronous generator and includes measuring the vibration of the stator, performing a frequency analysis of the vibration, and deducing whether the generator suffers from demagnetization of a permanent magnet, from the vibration analysis. Moreover, geometric eccentricity faults and electric short circuit faults may also be detected from the vibration.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: November 21, 2017
    Assignee: ABB Schweiz AG
    Inventor: Pedro Rodriguez
  • Patent number: 9762098
    Abstract: A rotor of an interior permanent magnet motor includes a rotor core having a plurality of magnet insertion holes, a shaft, a plurality of rare-earth magnets, and a pair of magnet fixing members. One surface of the magnet fixing member is provided with a plurality of pairs of tongue-like portions, and the tongue-like portions are inserted into the magnet insertion holes. On each of both sides in a rotary shaft direction, the rare-earth magnets have both end surfaces in a rotor circumferential direction sandwiched by a corresponding pair of tongue-like portions. An interval between the tongue-like portions includes, at a position separated from a base position, an interval that is smaller than the width of the rare-earth magnet in the rotor circumferential direction.
    Type: Grant
    Filed: October 2, 2013
    Date of Patent: September 12, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohiro Oketani, Masahiro Nigo, Kazuhiko Baba, Koji Yabe
  • Patent number: 9551347
    Abstract: Provided are a water pump motor that employs a stator core of an outer winding method that can use a low-cost ferrite magnet by minimizing an air gap between a magnet of a rotor and a stator core, and that heightens a fill factor, to thereby maximize efficiency of the motor, and a water pump using the water pump motor. The water pump motor includes a stator and an inner type rotor, in which the stator includes: a stator core whose inner circumferential portion is annularly interconnected, in which a number of protrusions are radially extended and formed; insulating bobbins that surround the stator core; a coil wound around the outer circumference of each bobbin; and an annular back yoke that surrounds in contact with the outer end of the stator core.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: January 24, 2017
    Assignee: AMOTECH CO., LTD.
    Inventor: Byoung Soo Kim
  • Patent number: 9479037
    Abstract: The present disclosure is directed to an electric generator and motor transmission system that is capable of operating with high energy, wide operating range and extremely variable torque and RPM conditions. In accordance with various embodiments, the disclosed system is operable to: dynamically change the output “size” of the motor/generator by modularly engaging and disengaging rotor/stator sets as power demands increase or decrease; activate one stator or another within the rotor/stator sets as torque/RPM or amperage/voltage requirements change; and/or change from parallel to series winding configurations or the reverse through sets of 2, 4, 6 or more parallel, three-phase, non-twisted coil windings with switchable separated center tap to efficiently meet torque/RPM or amperage/voltage requirements.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: October 25, 2016
    Assignee: Falcon Power, LLC
    Inventors: James L. Bailey, Harley C. McDonald
  • Patent number: 9343935
    Abstract: A rotor of a permanently excited synchronous machine includes a shaft capable of rotating about an axis and a laminated core having an axial layering arrangement defined by planes which are aligned perpendicular to the axis. The laminated core has at least two layers of different geometry. A first layer has a plate with a closed outer contour at least at an outer periphery, and a second layer has plural plate segments. The first and second layers of the laminated core are arranged in an axial direction to form axial pockets in interspaces between the plate segments of the second layer and recesses formed radially within the outer contour of the first layer for receiving permanent magnets. An adhesive is provided in radial gaps formed at least in axial sections of the second layer between adjacent plate segments and the permanent magnets.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: May 17, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Daniel Mader, Rolf Vollmer
  • Patent number: 9257874
    Abstract: A rotor unit includes a plurality of rotating bodies arranged along a central axis. Each of the plurality of rotating bodies includes an annular rotor core surrounding the central axis, a plurality of magnets arranged in the circumferential direction around the rotor core, and a holder arranged to hold the magnets. Further, the holder includes a plurality of partitioning portions each axially extending between respective ones of the plurality of magnets. The axial dimension of the plurality of partitioning portions is longer than the axial dimension of the respective ones of the plurality of magnets which are held by the plurality of partitioning portions. Further, the plurality of rotating bodies is disposed in a state where the circumferential positions of the plurality of magnets are out of alignment.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: February 9, 2016
    Assignee: NIDEC CORPORATION
    Inventors: Hidehiro Haga, Keita Nakanishi, Takayuki Migita, Masato Aono
  • Patent number: 9190892
    Abstract: An electro-magnetic coupling system for transferring torque between a pair of coaxial spools of a gas turbine engine is provided. The system includes a first rotor rotatable with one of the spools, a second rotor rotatable with the other of the spools, and a stator. The first and second rotors and the stator are coaxial with each other. The second rotor operably couples the first rotor and the stator. The first rotor carries a plurality of magnetic flux-producing formations which produce a first magnetic field. The stator carries a plurality of electrical winding coils which are energisable to generate a second magnetic field. The second rotor carries an arrangement of interpoles which modulate the first and second magnetic fields such that the modulated fields interact to transfer torque between the spools.
    Type: Grant
    Filed: March 20, 2013
    Date of Patent: November 17, 2015
    Assignee: ROLLS-ROYCE PLC
    Inventor: John Edward Anthony
  • Patent number: 8957555
    Abstract: A wind turbine rotary electric machine having a tubular body, in turn having a cylindrical wall; and a plurality of clips formed integrally with the cylindrical wall and configured so that each pair of facing clips defines a seat for housing an active sector.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: February 17, 2015
    Assignee: Wilic S.AR.L.
    Inventors: Otto Pabst, Matteo Casazza
  • Publication number: 20140375162
    Abstract: Exemplary embodiments disclose a rotor of an electric motor and an electric motor using the same. The rotor includes a core which includes a plurality of protrusion portions which are arranged along an outer circumference of the core and protrude radially to an outer portion of the core, and a plurality of concave portions interposed between the protrusion portions; a plurality of permanent magnets which are respectively disposed at the plurality of concave portions; and a plurality of pole pieces which are disposed at the plurality of concave portions and at outer sides of the plurality of permanent magnets. A length of each of the plurality of pole pieces in an axial direction is shorter than a length of each of the plurality of protrusion portions in the axial direction.
    Type: Application
    Filed: June 20, 2014
    Publication date: December 25, 2014
    Applicants: SAMSUNG ELECTRONICS CO., LTD., Kyungpook National University Industry-Academic Cooperation Foundation
    Inventors: Won-ho KIM, Seong-taek LIM, Hong-soon CHOI, Jin-woo CHO
  • Patent number: 8896177
    Abstract: An interior permanent magnet motor in provided which is made up of a permanent magnet, and a rotor core of which an insertion aperture for the permanent magnet to be inserted thereinto is formed in the rotor core. Additionally, the interior permanent magnet motor includes a first end plate which is connected to the rotor core and of which a first seating portion for the permanent magnet is disposed thereto is formed in the first seating portion and a second end plate which is connected to the rotor core and of which a second seating portion for the permanent magnet is disposed thereto is formed in the second end plate.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: November 25, 2014
    Assignee: Hyundai Motor Company
    Inventor: Myunggyu Kim
  • Publication number: 20140191608
    Abstract: Disclosed therein is a rotor for a motor. The rotor includes: a rotor core including an annular ring having a shaft hole formed at a central portion thereof, a plurality of yokes formed around the annular ring, and magnet insertion holes formed between the neighboring yokes; magnets respectively inserted into the magnet insertion holes; and a pair of rotor covers each having a ring plate, which has a shaft insertion hole formed at a central portion thereof, and a plurality of stoppers protrudingly formed around the ring plate. A pair of the rotor covers are joined to an upper portion and a lower portion of the rotor core in such a fashion that the stoppers are respectively located at side portions of the magnet insertion holes.
    Type: Application
    Filed: June 19, 2012
    Publication date: July 10, 2014
    Applicant: NEW MOTECH CO., LTD.
    Inventors: Jeong Cheol Jang, Ji Min Lee
  • Publication number: 20140184008
    Abstract: A brushless direct current (BLDC) motor includes a magnet which includes N poles and S poles extending in the up-down direction. The N poles and S poles are arranged to alternate with each other, surround an exterior of a shaft, and have a cylindrical shape when assembled. The magnet has upper and lower tapered portions in upper and lower portions thereof, with the diameter decreasing in the direction toward opposite ends, and a fixing center groove formed in the middle thereof. Fixing caps respectively have inclined portions at positions corresponding to the upper and lower tapered portions of the magnet so that the tapered portions fit into the inclined portions, thereby fixing an axial position of the magnet. A center ring is fitted into the center groove of the magnet in order to prevent the magnet from being dislodged while a rotor is rotating.
    Type: Application
    Filed: April 8, 2013
    Publication date: July 3, 2014
    Applicants: KIA MOTORS CORPORATION, HYUNDAI MOTOR COMPANY
    Inventors: Dong Myoung Ryoo, Bu Yeol Ryu, Pil Seon Choi, Bo Sung Lee
  • Patent number: 8723384
    Abstract: A rotary electric machine is provided with a shaft which is a rotary shaft; a laminated core which has a permanent magnet embedded therein and is press-fitted to the shaft; a first member which is a magnetic member and is press-fitted to the shaft so as to hold an end portion of the laminated core; a second member which is a nonmagnetic member and is provided between the end portion of the laminated core and the first member so as to hold an end portion, with respect to the axial direction of the shaft, of the permanent magnet; and at least one of a first gap between the first member and the second member, and a second gap between the laminated core and the second member.
    Type: Grant
    Filed: February 22, 2012
    Date of Patent: May 13, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hirohisa Yokota, Shinsuke Kayano, Yoshiaki Kitta
  • Patent number: 8723383
    Abstract: A buried-magnet internal rotor (1) for an electric rotating machine, the rotor including a shaft (2), a plurality of polar parts (30) made of a magnetic material surrounding the shaft, the polar parts delimiting housings (40) between them, a first lateral shroud (5) and a second lateral shroud (5?) axially on each side of the polar parts along the shaft (2), the shaft passing through each lateral shroud through a central opening in each lateral shroud, at least one tie-rod (6) per polar part, the tie-rod clamping each polar part between the lateral shrouds, permanent magnets (4) placed in the housings (40), wherein the shaft includes, for the first lateral flange (5), an internal shoulder (22) designed to form an axial abutment against which the first flange is held axially by an external ring (26) secured to the shaft.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: May 13, 2014
    Assignees: Michelin Recherche et Technique S.A., Compagnie Generale des Establissments Michelin
    Inventors: Maeick Blanc, Frederic Progin
  • Patent number: 8692431
    Abstract: A permanent magnet rotor including a shaft, a rotor core fixed to the shaft, a magnet disposed around the core, and a linker fixed relative to the shaft and located at one end of the core. An elastic clamping structure is arranged between the linker and the magnet such that rotational torque of the magnet is transferred to the shaft via the linker.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: April 8, 2014
    Assignee: Johnson Electric S.A.
    Inventors: James Ching Sik Lau, Jun Yang, Wan Mei He
  • Publication number: 20140084759
    Abstract: An electromechanical device has a rotor and a stator provided on an outer circumference of the rotor. The rotor includes a rotation shaft, a plurality of rotor magnets cylindrically fixed and arranged along an outer circumference of the rotation shaft, and two magnet side yokes fixed and arranged in contact with side surfaces at both sides of the rotor magnets in a shaft direction of the rotation shaft. Overhang parts that suppress the rotor magnets with respect to radiation directions from a center of the rotation shaft toward the outer circumference and limit movements of the rotor magnets in the radiation directions are provided on surfaces of the magnet side yokes in contact with the rotor magnets.
    Type: Application
    Filed: September 23, 2013
    Publication date: March 27, 2014
    Applicant: Seiko Epson Corporation
    Inventor: Kesatoshi TAKEUCHI
  • Patent number: 8664819
    Abstract: An apparatus and method for the installation and removal of permanent magnets in a permanent magnet electromechanical machine, for example a wind turbine power unit generator. A magnet holder is mounted on a magnet carrying structure such as a rotor. Permanent magnets may be inserted into and removed from the magnet holder after the electromechanical machine is assembled. In this manner, permanent magnets may be installed on the magnet carrying structure by an interference fit, without using bolts or adhesives, to facilitate both assembly and removal for maintenance and repair.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: March 4, 2014
    Assignee: Northern Power Systems Utility Scale, Inc.
    Inventors: Mark S. Piercey, Peter P. Mongeau, Jonathan A. Lynch, Thomas D. Kohler, Paul A. Smith
  • Publication number: 20140042858
    Abstract: A rotor for a rotary electric machine includes a pair of Lundell-type cores, a plurality of magnets, and a magnet retainer. The pair of Lundell-type cores includes a plurality of claw poles with flange portions projecting to a circumferential direction of the rotor from an end portion on an outer diameter side of each of the claw poles. The plurality of magnets are arranged between the pair of Lundell-type cores, and are magnetized in a direction of reducing flux leakage. The magnet retainer retains each of the magnets, and has side surfaces in the circumferential direction. At least one of the side surfaces is provided with at least one projection for restraining movement of the magnet retainer in an axial direction along a rotary shaft.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 13, 2014
    Inventors: Hiroyuki TSUCHIYA, Koji KONDO
  • Publication number: 20140021819
    Abstract: A spoke type permanent magnet motor according to the present invention includes a stator having a stator slot radially disposed according to the center thereof and a stator core radially formed between the stator slots; a spoke type rotor, provided inside or outside the stator, having a rotor core radially disposed in the same direction as the stator slot and stator core and a permanent magnet radially disposed between the rotor core; a first fastening member, made of non-magnetic material, provided at the top and bottom of the rotor, respectively, in the height direction of the rotor; and a second fastening member, made of non-magnetic material, provided to penetrate the rotor core and first fastening member, thereby to maintain high output density and to easily implement miniaturization.
    Type: Application
    Filed: March 26, 2012
    Publication date: January 23, 2014
    Applicant: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
    Inventors: Jung-Pyo Hong, Sung-Il Kim
  • Publication number: 20130334923
    Abstract: A rotor for an electric machine has a rotor member extending circumferentially about the axis of rotation of the rotor, and a locking device in an axial end region of a guide to mount permanent magnets in the direction of the axis of rotation of the rotor. The locking device is retained on the rotor member in the radial direction and in the direction of rotation of the rotor by guides. The locking device has a movable movement element and is designed such that when the movement element is moved, the locking device is positively or non-positively connected to the rotor member.
    Type: Application
    Filed: February 21, 2012
    Publication date: December 19, 2013
    Applicant: Siemens Aktiengesellschaft
    Inventors: Ulrich Hartmann, Christian Knop, Robert Schwenger, Gordon Trogisch
  • Patent number: 8598759
    Abstract: A magnetic gear arrangement includes: a first gear member for generating a first magnetic field, a second gear member for generating a second magnetic field, and a coupling device which provides an arrangement of interpoles between the first gear member and the second gear member. The interpoles couple the first and second magnetic fields to produce a gearing between the first and second gear members. The first gear member has superconducting magnets or coils for generating the first magnetic field and/or the second gear member has superconducting magnets or coils for generating the second magnetic field.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: December 3, 2013
    Assignee: Rolls-Royce PLC
    Inventors: Huw Llewelyn Edwards, Christopher Graham Bright
  • Patent number: 8508091
    Abstract: An end cover adapted to engage with an end surface of a spindle of a motor rotor is proposed for securely coupling to the spindle with a plurality of permanent magnets disposed around the peripheral wall of the spindle. The end cover has a first surface facing an end surface of the spindle and an second surface opposing to the first surface, which is formed with a plurality of inserting slots indentedly disposed around the rim thereof and corresponding to the permanent magnets for coupling the ends of the permanent magnets, thereby securely fastening each of the permanent magnets to the spindle of the motor rotor. Further, the present invention further provides a motor rotor having the end covers described above.
    Type: Grant
    Filed: December 30, 2008
    Date of Patent: August 13, 2013
    Assignee: System General Corporation
    Inventors: Shih-Jen Yang, Hung-Sen Tu, I-Hsing Chen, Chen-Chia Yang, Chung-En Chen
  • Patent number: 8482178
    Abstract: In a rotor structure of a permanent magnet type rotary machine comprising a cylindrical permanent magnet 3 fixed on an outer peripheral surface of a rotor shaft 2, wherein torque acting on the permanent magnet 3 is transmitted to the rotor shaft 2, the rotor structure further comprises two annular side plates 4 and a holding ring 5. Each side plate has an axial hole 4a into which the rotor shaft 2 is fitted so as to rotate with the side plates integrally and the side plates 4 are attached on the both end surface of the permanent magnet 3, respectively so as to confront with each other. A circular U-shaped groove 4c coaxially with the axial hole 4a is provided at a end surface 4b for facing with the permanent magnet 3 of each side plate 4. The holding ring 5 is formed cylindrically and covers circumferential sections of the permanent magnet 3 and the side plates 4 and fasten the permanent magnet 3 and the side plates 4 so as to move them integrally.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: July 9, 2013
    Assignee: Meidensha Corporation
    Inventors: Takashi Okitsu, Daiki Matsuhashi, Yukimasa Hisamitsu, Toru Kakebayashi
  • Patent number: 8446060
    Abstract: An electrical machine apparatus having magnetic gearing embedded therein includes a moveable rotor having a first magnetic field associated therewith, a stator configured with a plurality of stationary stator windings therein, and a magnetic flux modulator interposed between the moveable rotor and the stator windings.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: May 21, 2013
    Inventor: Richard H. Lugg
  • Patent number: 8432080
    Abstract: This invention provides a rotating electrical machine including a rotor that has an even number of first permanent magnets aligned in a circumferential direction of the rotor, second permanent magnets of a number equal to that of the first permanent magnets, provided respectively between the stator and circumferential ends of the first permanent magnets adjacent to each other in the circumferential direction, and core pieces of a number equal to that of the first permanent magnets, provided respectively between the second permanent magnets adjacent to each other in the circumferential direction.
    Type: Grant
    Filed: August 10, 2010
    Date of Patent: April 30, 2013
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Souji Murakami, Motomichi Ohto, Haruki Yahara, Shinichi Nishi
  • Patent number: 8381389
    Abstract: A method for assembling the rotor (R) connected with a shaft (4) and made by permanent magnets (2). The method includes providing an annular flange (9); forming a plurality of fixed linear guides on the annular flange (9); positioning another annular flange (90) on the guides; and locking the second flange (90) to the guides, so that the magnets (2) are clamped, inside the guides, by the first and the second flange (9, 90). The guides are formed by inserting a rod (13) through each of passing holes (91) in the first flange (9) and locking the rods (13) to the first flange (9); fitting, on the rods (13), a body (12) having a central portion with a passing hole (121) and side arms (122); fitting a spacer (11) on each rod (13); and fitting, on each rod, a body (12) having a passing hole (121) and two arms (122).
    Type: Grant
    Filed: August 25, 2009
    Date of Patent: February 26, 2013
    Inventors: Renzo Lisi, Leonardo Lenzi
  • Patent number: 8310122
    Abstract: A rotating machine has a stator and a permanent magnet rotor that is more easily made, lower cost, and lighter by virtue of a plurality of permanent magnet assemblies mounted on a rotor body. Each magnet assembly includes two facing core plate stacks supporting a permanent magnet between them. Each core plate stack is made from a plurality of core plates of substantially identical size and shape and with on or more holes in substantially the same location to form respective bores in the stack. A tie rod is formed in each bore and retains the plates in a stack via bevels in the holes of the end plates. Preferably, the tie rods also apply compressive force as a result of placing the stacked plates in an injection mold, injecting plastic into the mold to fill each bore with plastic, and allowing the plastic to cure. As the plastic cures, it shrinks so that the tie rods pull the end plates together. To enhance the pressure, the stacked plates can be compressed before and during the injection process.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: November 13, 2012
    Assignee: Wilic S.A.R.L.
    Inventors: Otto Pabst, Franco Gadrino
  • Patent number: 8304948
    Abstract: A rotor structure of a permanent magnet electrical machine and a method for manufacture of the rotor structure. The rotor structure has a shaft. An outer surface of the shaft is provided with a permanent magnet. A support collar encircles the permanent magnet. A protective piece is located between the outer surface of the shaft and an inner surface of the support collar and is arranged as an axial mechanical extension for the permanent magnet. The protective piece reduces local maximum values of forces forming between the support collar and the permanent magnet during rotation of the rotor.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: November 6, 2012
    Assignee: Sulzer Pump Solutions AB
    Inventors: Erkki Lantto, Marko Palko, Ville Tommila
  • Publication number: 20120139377
    Abstract: An interior permanent magnet motor in provided which is made up of a permanent magnet, and a rotor core of which an insertion aperture for the permanent magnet to be inserted thereinto is formed in the rotor core. Additionally, the interior permanent magnet motor includes a first end plate which is connected to the rotor core and of which a first seating portion for the permanent magnet is disposed thereto is formed in the first seating portion and a second end plate which is connected to the rotor core and of which a second seating portion for the permanent magnet is disposed thereto is formed in the second end plate.
    Type: Application
    Filed: June 29, 2011
    Publication date: June 7, 2012
    Applicant: HYUNDAI MOTOR COMPANY
    Inventor: Myunggyu Kim
  • Patent number: 8179010
    Abstract: A rotor is provided. The rotor includes a rotor iron core including slots formed around an outer circumferential portion thereof; magnet pieces which are inserted into the slots, respectively, such that a magnetic orientation of the magnet pieces are inverted every predetermined number of the slots; and two end plates, one end plate disposed on each end side in an axial direction of the rotor iron core, the two end plates covering the slots in the axial direction. The rotor iron core also includes cutout portions, which are located at an interval between adjacent ones of the slots, each of the cutout portions extending in the axial direction of the rotor iron core. One of the two end plates includes injection openings, each of which corresponds to a respective one of the slots, and communicating grooves each of which is formed so as to communicate with one of the cutout portions.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: May 15, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Masaki Ogami, Hiroyuki Sato
  • Patent number: 8093766
    Abstract: A cylindrical linear motor capable of solving the problem that a leak flux links an aluminum frame at both ends of an armature of a conventional cylindrical linear motor, which causes a viscous braking force as a motor brake force, is provided. The cylindrical linear motor armature 20 includes a plurality of cylindrical coils 20a arranged in the axial direction in a cylindrical yoke 20b formed by a magnetic material and frames 20d and 20e covering the outside of the cylindrical yoke 20b. Only in the axial direction region of the frame 20d where the cylindrical yoke 20b exists, the frame 20d is formed by an aluminum frame 20d, and the axial direction both end portions are formed by a resin cap 20e.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: January 10, 2012
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Toshiyuki Hoshi, Toru Takano, Masahiko Tanabe, Takahisa Yamada, Seigo Nagamatu
  • Patent number: 8089189
    Abstract: A rotor (12) for an electric machine (10) includes a rotor disc (24) extending radially outwardly from a central axis (18) of the rotor (12) and a magnet retention band (30) including a plurality of magnet retention tabs (32). The magnet retention tabs (32) extend radially from the magnet retention band (30) and axially along a length of the magnet retention band (30). The magnet retention band (30) is secured to the rotor face (24) via a retention means and extends substantially axially therefrom. A plurality of permanent magnets (14), each permanent magnet (14) of the plurality of permanent magnets (14) are located at the magnet retention band (30) between adjacent magnet retention tabs (32) and are radially and circumferentially retained between the magnet retention tabs (32) and the magnet retention band (30).
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: January 3, 2012
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Richard A. Himmelmann
  • Publication number: 20110254399
    Abstract: A buried-magnet internal rotor (1) for an electric rotating machine, the rotor comprising: a shaft (2), a plurality of polar parts (30) made of a magnetic material surrounding the shaft, the polar parts delimiting housings (40) between them, a first lateral shroud (5) and a second lateral shroud (5?) axially on each side of the polar parts along the shaft (2), the shaft passing through each lateral shroud through a central opening in each lateral shroud, at least one tie-rod (6) per polar part, the tie-rod clamping each polar part between the lateral shrouds, permanent magnets (4) placed in the said housings (40), wherein the shaft comprises, for the first lateral flange (5), an internal shoulder (22) designed to form an axial abutment against which the first flange is held axially by an external ring (26) secured to the shaft.
    Type: Application
    Filed: July 28, 2009
    Publication date: October 20, 2011
    Inventors: Maeick Blanc, Frederic Progin
  • Patent number: 7986068
    Abstract: A motor including: a rotatably supported shaft; and a rotor section press-fitted and fixed coaxially to the shaft, wherein the rotor section is provided with: a rotor yoke; a housing hole formed on an end surface of the rotor yoke along the axial direction of the shaft; a permanent magnet housed within the housing hole; and a pair of end surface plates: that have a ring-shaped plate that is provided so as to cover at least an opening section of the housing hole and that is made of a non-magnetic material, and a supporting plate that supports the ring-shaped plate, that is press-fitted and fixed on the shaft, and that has a coefficient of linear expansion equivalent to that of the shaft; that are provided on axial end portions of the rotor yoke; and that clamp the rotor yoke so as to hold the permanent magnet within the housing hole.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: July 26, 2011
    Assignee: Honda Motor Co., Ltd.
    Inventors: Takanori Suzuki, Tatsuya Fukushima
  • Patent number: 7932657
    Abstract: A rotor body for an electric motor is comprised of connecting outer peripheral portions of first and second flange members made of electrically conductive material to the opposite ends of a plurality of connection members made of electrically conductive material of weak magnetic material arranged at predetermined distances therebetween in the circumferential direction with bolts and by supporting induction magnetic poles made of soft magnetic material between the connection members which are adjacent in the circumferential direction. Coupling portions of the first and second flange members and the connection member are electrically insulated by insulation coating so that an eddy current flowing in a closed circuit comprised of the first flange member, the connection member, the second flange member and the other connection member can be reduced and heat dissipation and energy loss accompanied by the eddy current can be minimized at the time of an operation.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: April 26, 2011
    Assignee: Honda Motor Co., Ltd.
    Inventors: Masashi Bando, Noriyuki Abe, Shigemitsu Akutsu, Satoyoshi Oya
  • Publication number: 20110062812
    Abstract: A rotor structure for a motor includes a shaft, a single magnet, and two fixing seats. The shaft passes through the single magnet and the two fixing seats, with the two fixing seats being adjacent to and abutting against two end faces of the single magnet, respectively. The single magnet fits with a small clearance or loosely fits the shaft, and the two fixing seats tightly fit the shaft, such that the single magnet is positioned at a predetermined position relative to the shaft without rupture. Furthermore, each of the two end faces and two abutting faces are formed with rough surfaces and/or with corresponding grooves and protrusions, so as to achieve a stable-engaging effect between the single magnet and fixing seats.
    Type: Application
    Filed: November 22, 2010
    Publication date: March 17, 2011
    Inventors: Alex HORNG, Tso-Kuo YIN
  • Patent number: 7895729
    Abstract: A process for mounting magnets in an electric motor rotor and an electric motor rotor, said rotor comprising: a lamination stack (10) provided with a plurality of axial channels (12) disposed around a central axial bore (11) and housing permanent magnets (20); and a rotor cage (30) formed by a pair of end rings (31), each seated against an adjacent end lamination of the lamination stack (10) and interconnected by a plurality of bars (32), said process comprising the steps of: forming an end, ring (31) with at least one inner radial projection (33) disposed radially external to the projection of the contour of an axial channel (12); mounting in each axial channel (12) at least one permanent magnet (20); and deforming each inner radial projection (33) in order to increase its radial extension the sufficient to radially cover at least part of the projection of the contour of said axial channel (12), defining a stop for axially retaining the respective permanent magnet (20).
    Type: Grant
    Filed: June 6, 2005
    Date of Patent: March 1, 2011
    Assignee: Whirlpool S.A.
    Inventors: Gelson Longo, Orlando Starke, Roberto Claudio Hille, Jose Walter Mohr, Arturo Rivio Ramirez
  • Patent number: 7893582
    Abstract: A hollow motor drive device includes a screw shaft provided with a spiral screw groove formed in an outer peripheral surface thereof, a nut member screw-engaged with the screw groove, a hollow drive shaft having an inner peripheral side on which the nut member is fixed and an outer peripheral side on which a permanent magnet is disposed, and a housing provided with a bearing portion rotatably supporting the hollow drive shaft and a coil portion. In the hollow drive shaft, the nut member and the permanent magnet are disposed so as not to be overlapped with each other in a direction perpendicular to the axial direction of the hollow drive shaft, and in the housing, the bearing portion is disposed to a position corresponding to the nut member, and the coil portion is disposed to a position corresponding to the permanent magnet.
    Type: Grant
    Filed: December 26, 2006
    Date of Patent: February 22, 2011
    Assignees: THK Co., Ltd, THK GmbH
    Inventors: Reinhart G Welle, Dirk Loeckmann