Drum Patents (Class 310/265)
  • Patent number: 10916979
    Abstract: A rotor of a line-start synchronous reluctance motor is provided, which includes: a laminated core comprising multiple laminated core sheets having multiple rotor bar holes formed therein in proximity to the circumference thereof, respectively; end plates fixed to both sides of the laminated core, respectively; rotor bars inserted into the rotor bar holes, respectively; and a rotating shaft coupled to the laminated core to be able to rotate integrally, wherein the core sheets comprise multiple flux barriers and steel plate portions on which the flux barriers are not formed, respectively, and extended ends of the flux barriers may be positioned between the rotor bar holes.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: February 9, 2021
    Assignee: HYOSUNG HEAVY NDUSTRIES CORPORATION
    Inventors: Jeong Ho Seo, Huai Cong Liu, Ju Lee
  • Patent number: 10840773
    Abstract: A stator includes: a substantially cylindrical core allowing arrangement of a winding inside the core; and a stator frame joined to the outer lateral surface of the core through a joint. The joint is formed at least at a part of a boundary where the outer lateral surface of the core and the inner lateral surface of the stator frame are in contact with each other. A material forming the core and a material forming the stator frame are mixed at the joint.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: November 17, 2020
    Assignee: FANUC CORPORATION
    Inventor: Shinobu Takano
  • Patent number: 10576822
    Abstract: A power take-off unit ring gear shaft, a method of manufacturing such a power take-off unit ring gear shaft and an apparatus comprising the power take-off unit ring gear shaft. The ring gear shaft of the invention has an annular shaft wall which surrounds a hollow inner cavity that extends throughout the entire gear shaft in an axial direction, and hollow portions are formed in the shaft wall. The invention realizes a lightweight product, helps to realize a lightweight entire vehicle, and meanwhile reduces machining areas, thus improving production efficiency of machining, reducing production cost of product, reducing labor intensity and improving productivity.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: March 3, 2020
    Assignee: GF Casting Solutions Kunshan Co. Ltd.
    Inventors: Jack Zhang, Richard Zhang, Aaron Fu
  • Patent number: 10247248
    Abstract: A drive shaft includes a first shaft member made of metal, a tubular member made of CFRP, and a first exterior sleeve. The first shaft member is capable of being attached on one end side thereof to a first constant velocity joint, and has a first serrated part on which serrations are formed on another end side thereof. The tubular member is formed with a first fitting part fitted externally over the first serrated part. The first exterior sleeve covers the first fitting part by being disposed to extend over outer circumferential surfaces of the first shaft member and the tubular member. A film provided with a bonding assistance region and an adhesive are interposed between the outer circumferential surface of the tubular member and the inner circumferential surface of the first exterior sleeve.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: April 2, 2019
    Assignee: HONDA MOTOR CO., LTD.
    Inventor: Mitsuru Kamikawa
  • Patent number: 10205364
    Abstract: The main function of the invention is the rectification of angular errors due to torsion in long and slim axles for electric motors of which a rotor and stator are divided into two or more sub motors, and wherein rotors are coupled to a common axle and wherein two or more stator elements are supplied with equal electrical phases from a power supply cable. The invention is a system and a coupling between rotor elements and an axle extending through the system, the purpose being to dynamically compensate for angular errors due to torsion in the axle between two or more rotor elements in which the torsion angle would influence negatively the electrical efficiency of the rotor elements. The object of the invention is the angular positioning of rotor elements so that the poles are electrically synchronous, thereby avoiding reduction of the electrical efficiency due to torsion in the axle.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: February 12, 2019
    Assignee: TECHNI HOLDING AS
    Inventor: Harald Borgen
  • Patent number: 10128729
    Abstract: An intermittent movement type strong magnetic motor having a control device (PLC) for first controlling an arresting device to lock an electromagnetic coil, then controlling a power supply device to start power supply. After a given length of time of power supply when the current rises to the highest point or rises to a level as required, the arresting device releases the electromagnetic coil quickly to allow the electromagnetic coil to move and operate immediately. The intermittent movement type strong magnetic motor maximally avoids restriction of counter-electromotive force and makes full use of the great action force created between magnetic fields and the electromagnetic coil, thereby ideally converting magnetic forces to mechanical energy and increasing energy efficient ratio of the motor.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: November 13, 2018
    Inventor: Jiuda Zou
  • Patent number: 9879696
    Abstract: An electric fluid pump having a rotor. The rotor of the pump is provided with elements that produce an at least partially axially directed fluid flow in the wet section of the pump during rotation of the rotor. This fluid flow serves to cool components of the pump that are arranged in or on the wet section.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: January 30, 2018
    Assignee: Continental Automotive GmbH
    Inventors: Detlef Kreutz, Peter Koeppler
  • Patent number: 9768650
    Abstract: The present invention relates to a stator and a motor equipped with the stator, the stator including an inner core including an inner core body and a plurality of teeth radially formed at a periphery of the inner core body; a coil wound on each tooth; an outer core multiply divided to be coupled between the plurality of teeth; and a press-fitting unit formed at the inner core and the outer core to allow the outer core to be press-fitted between the teeth, whereby it is easy to assemble the stator and to wind the coil, thereby reducing a manufacturing cost and enhancing concentricity level between an external diameter and an inner diameter of a stator core.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: September 19, 2017
    Assignee: LG INNOTEK CO., LTD.
    Inventors: Kyungsang Park, Gyusun Park, Musung Jung
  • Patent number: 9583987
    Abstract: A stator includes a hollow cylindrical stator core having stator teeth and slots. The stator teeth each extend radially inward and are circumferentially spaced from one another. Each of the slots is formed between one circumferentially-facing pair of the stator teeth and opens at the radially inner periphery of the stator core. Each of the stator teeth has a distal end portion that includes a slit, a base part and an oblique part. The slit is formed in a distal end surface of the stator tooth and extends axially. The base part and the oblique part are formed respectively on opposite circumferential sides of the slit. The base part extends radially inward to have a distal end surface that makes up an inner-diameter surface of the stator core. The oblique part is bent toward an adjacent slot so as to extend obliquely with respect to the base part.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: February 28, 2017
    Assignee: DENSO CORPORATION
    Inventors: Hiroyuki Ikuta, Junichi Nakazono, Kuniharu Teshima, Yuusuke Hara
  • Patent number: 9331530
    Abstract: Disclosed herein is a laminated core of a motor including: a first core sheet including a first rounded core base, a plurality of first teeth which are radially formed on the first core base, and first tooth ears formed at the end of each of the first teeth; and a second core sheet including a second rounded core base, a plurality of second teeth which are radially formed on the second core base, and second tooth ears formed at the end of each of the second teeth, the second core sheet having the same shape as the first core sheet but being smaller than the first core sheet, wherein the second core sheet is located at the lowermost part, one or more the first core sheets are laminated on the second core sheet, and another second core sheet is located at the uppermost part.
    Type: Grant
    Filed: July 7, 2014
    Date of Patent: May 3, 2016
    Assignee: NEW MOTECH CO., LTD.
    Inventors: Jeong Cheol Jang, Kyoung Joo Lee, Hyun Sung Yang
  • Patent number: 9209659
    Abstract: An armature for a rotating electric machine includes an armature core and an armature coil. The armature core includes a substantially annular main body disposed in radial opposition to a field of the machine and teeth extending from the main body radially toward the field. The armature coil is arranged between the teeth of the armature core. For each of the teeth, there are formed a protrusion and a pair of claws at a distal end of the tooth. The protrusion protrudes from a circumferentially central part of the distal end of the tooth radially toward the field. The claws extend, respectively on opposite circumferential sides of the protrusion, from the distal end of the tooth toward the field. Each of the claws has a smaller width at its distal end than at its proximal end and is arcuate-shaped so as to engage with and thereby retain the armature coil.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: December 8, 2015
    Assignee: DENSO CORPORATION
    Inventors: Akio Mori, Kazuhiro Nobata, Masayoshi Yamamoto, Yoshiyasu Kozaki, Noboru Taniguchi, Masayuki Takiguchi
  • Patent number: 9071098
    Abstract: A centrifugal heat dissipation device and a motor using same are disclosed. The centrifugal heat dissipation device includes a main body having a shaft hole, a heat-absorption zone and a heat-transfer zone. The heat-transfer zone has a radially outer side connected to the heat-absorption zone and a radially inner side connected to the shaft hole. The shaft hole axially extends through the main body for receiving a shaft of a motor therein. A centrifugal force generated by the rotating shaft and accordingly, the heat dissipation device enables enhanced vapor-liquid circulation of a working fluid in the heat dissipation device, so that heat generated by the operating motor is absorbed by the centrifugal heat dissipation device and transferred to the shaft for guiding out of the motor, allowing the motor to have largely upgraded heat dissipation performance.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: June 30, 2015
    Assignee: Asia Vital Components Co., Ltd.
    Inventors: Shyy-Woei Chang, Kuei-Feng Chiang
  • Patent number: 9071100
    Abstract: A centrifugal heat dissipation device and a motor using same are disclosed. The centrifugal heat dissipation device includes a main body having a shaft hole, a heat-absorption zone and a heat-transfer zone. The heat-transfer zone has a radially outer side connected to the heat-absorption zone and a radially inner side connected to the shaft hole. The shaft hole axially extends through the main body for receiving a shaft of a motor therein. A centrifugal force generated by the rotating shaft and accordingly, the heat dissipation device enables enhanced vapor-liquid circulation of a working fluid in the heat dissipation device, so that heat generated by the operating motor is absorbed by the centrifugal heat dissipation device and transferred to the shaft for guiding out of the motor, allowing the motor to have largely upgraded heat dissipation performance.
    Type: Grant
    Filed: April 23, 2014
    Date of Patent: June 30, 2015
    Assignee: Asia Vital Components Co., Ltd.
    Inventors: Shyy-Woei Chang, Kuei-Feng Chiang
  • Patent number: 8754567
    Abstract: An electric generator comprises a line; a cage having a plurality of magnets secured to the cage, wherein the cage is hanging from the line; and conductive coils surrounding the cage, wherein the cage receives a force causing the cage to rotate and wherein electricity is generated at the conductive coils when the cage rotates.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: June 17, 2014
    Inventor: Kachon Sitou
  • Patent number: 8294322
    Abstract: In a rotating electrical machine, when a stator winding is wound in concentrated winding, an improvement in performance is achieved by reducing a magnetomotive force harmonic without reducing a fundamental wave magnetic flux generated by a stator. A rotating electrical machine (10) includes a rotor (18), and two stators (14, 16) opposed with the rotor (18) being interposed therebetween either on both sides of the rotor (18) in the axial direction or on both sides of the rotor (18) in the radial direction. Stator windings (22) provided in a plurality of portions in the circumferential direction of each stator (14, 16) are wound in concentrated winding. The directions of magnetic fluxes generated by stator windings (22) having the same phase in the stators (14, 16) are in mutually opposite directions with respect to either the axial direction or the radial direction.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: October 23, 2012
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kosuke Aiki, Hideo Nakai, Takaji Umeno, Eiji Yamada, Kazutaka Tatematsu, Norimoto Minoshima, Toshihiko Yoshida, Tatsuya Uematsu, Kenji Endo
  • Patent number: 8134267
    Abstract: The present invention relates to a motor. A motor including a stator and a rotor that is rotatably provided at an outer side in a radial direction of the stator, the rotor comprising: a base part; a side wall part that is integrally formed with the base part and vertically extended with respect to the base part; and a permanent magnet that is provided at an inner side of the side wall part, wherein a spacing distance from an inner side surface of the base part to a lower end of the permanent magnet is formed to be larger than a radial thickness of the permanent magnet.
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: March 13, 2012
    Assignee: LG Electronics Inc.
    Inventor: Sung Jung Kim
  • Patent number: 8074344
    Abstract: The manufacturing method of a rotor holder according to the present invention includes a step in which a top plate portion having a substantially discoid shape substantially centered about a central axis, and a side wall portion extending from an outer circumferential edge of the top plate portion are formed simultaneously by feeding a metal plate in a predetermined direction and pressing the metal plate by a die. Also, the present manufacturing method includes a step in which a punched portion is formed at the side wall portion.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: December 13, 2011
    Assignee: Nidec Corporation
    Inventors: Satoru Hanaoka, Tomotsugu Sugiyama, Shinya Tabata, Takashi Tsukada
  • Patent number: 8058763
    Abstract: A permanent magnet rotor arrangement that is particularly suitable for low-speed large-diameter electrical generators includes a rotor 2 having a radially outer rim 4. A circumferential array of magnet carriers 12 is non-releasably affixed to the outer rim 4 of the rotor and have a radially outer surface. An inverted U-shaped pole piece retainer 18 made of non-magnetic material such as stainless steel is affixed to each magnet carrier 12 and is formed with an axially extending channel. At least one pole piece 16 made of a magnetic material such as steel is located adjacent to the radially outer surface of each magnet carrier 12 and in the channel formed in its associated pole piece retainer 18.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: November 15, 2011
    Assignee: Converteam UK Ltd
    Inventors: Paul Eaton Clark, Andrew James Bullock, Allan David Crane
  • Patent number: 7750530
    Abstract: A method of providing an outside rotor electric machine having a reduced radial air gap variation across an axial length of the air gap, the machine including a rotor having a cylindrical elongated portion supporting magnets and a flange extending at least partially radially from a rotating shaft, the method comprising increasing a radial deflection of the elongated portion in proximity of the flange by connecting the elongated portion to the flange through a radial spring having a stiffness lower than that of the elongated portion.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: July 6, 2010
    Assignee: Pratt & Whitney Canada Corp.
    Inventor: Michael Dowhan
  • Patent number: 7723891
    Abstract: A motor including a mounting shaft having a hollow channel and a bearing attached to each end, a cylindrical hub having a hollow core for the mounting shaft, and plural rows of plural Molded Magnetic Flux Channels with a hollow core and a channel forming a U-shaped recess and mounted the surface of the hub, each row corresponding to a motor phase. Each magnetic flux channel forms two pole pieces divided by the channel. The motor also includes plural phase windings, one passing through each row of plural Molded Magnetic Flux Channels, a rotating drum having plural rows of permanent magnets on an inner surface, each row pair corresponding to and aligned with one of the plural rows of Molded Magnetic Flux Channels. The rotating drum connected with the bearing, and drive electronics for driving the plural phase windings, wherein the plural Molded Magnetic Flux Channels increases torque and motor efficiency.
    Type: Grant
    Filed: February 16, 2009
    Date of Patent: May 25, 2010
    Inventor: Norman Rittenhouse
  • Patent number: 7629724
    Abstract: An axial air-gap electronic motor is arranged such that a teeth surface of a stator and a magnet surface of a rotor are arranged opposedly with a predetermined gap therebetween along an axis line direction of an output shaft of the rotor. The rotor has a rotor back yoke arranged coaxially with the stator, and a rotor magnet installed to the rotor back yoke so as to face the teeth surface of the stator. The rotor magnet is provided with an anchor magnet which is integral with the rotor magnet and is arranged on a back surface side of the rotor back yoke.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: December 8, 2009
    Assignee: Fujitsu General Limited
    Inventors: Toshiaki Tanno, Tomonori Kojima
  • Patent number: 7548007
    Abstract: A rotor has a rim that diverges from its peripheral portion. Accordingly, the rim more securely couples with a shaft. More specifically, the rotor has a support member with a peripheral portion and an interior rim. The interior rim defines a central opening and, as noted above, diverges from the peripheral portion. The rotor also has a shaft coupled within the central opening of the support member.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: June 16, 2009
    Assignee: Comair Rotron Inc.
    Inventor: Munir Fallad Chavez
  • Publication number: 20090091211
    Abstract: A small size permanent magnet direct current motor has a housing accommodating a permanent magnet stator and a wound rotor. The rotor has a rotor core with a diameter of 23 mm±3 mm and 12 poles and a cylindrical commutator. The motor has an output power of more than 25 watts.
    Type: Application
    Filed: October 8, 2008
    Publication date: April 9, 2009
    Inventors: Wen Jun HUAN, Jian Wen Zhang, Wai Shing Ip
  • Publication number: 20090072657
    Abstract: A permanent magnet has magnetic poles being circumferentially different from each other. An armature is rotatable at a radially inside of the permanent magnet and has a laminated core and a coil. The laminated core includes magnetic plates laminated in an axial direction so as to interpose an insulating layer. The magnetic plates include end magnetic plates located at most distant ends. At least one of the end magnetic plates has an outer circumferential side provided with a collar, which extends in the rotation axis direction so as to be opposed to pole faces of the permanent magnet. The at least one of the end magnetic plates has a thickness t, and the collar has a length h. The thickness t and the length h have a relationship of h/t?10.
    Type: Application
    Filed: September 12, 2008
    Publication date: March 19, 2009
    Applicant: DENSO CORPORATION
    Inventor: Kiyonori Moroto
  • Patent number: 7492074
    Abstract: A motor including a mounting shaft having a hollow channel and a bearing attached to each end, a cylindrical hub having a hollow core for the mounting shaft, and plural rows of plural Molded Magnetic Flux Channels with a hollow core and a channel forming a U-shaped recess and mounted the surface of the hub, each row corresponding to a motor phase. Each magnetic flux channel forms two pole pieces divided by the channel. The motor also includes plural phase windings, one passing through each row of plural Molded Magnetic Flux Channels, a rotating drum having plural rows of permanent magnets on an inner surface, each row pair corresponding to and aligned with one of the plural rows of Molded Magnetic Flux Channels. The rotating drum connected with the bearing, and drive electronics for driving the plural phase windings, wherein the plural Molded Magnetic Flux Channels increases torque and motor efficiency.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: February 17, 2009
    Inventor: Norman Rittenhouse
  • Publication number: 20090001844
    Abstract: A motor adopting an improved mechanism is composed of a stator having a shaft and a rotor provided with a sleeve and a hub, wherein the shaft is inserted into the hub and the hub is fixed on an outer circumferential surface of the sleeve. The outer circumferential surface of the sleeve is provided with a first outer circumferential surface, a second outer circumferential surface and a receiving surface that links between the first and second outer circumferential surfaces. The hub is provided with a base section, a through hole and a first protruded section protruding downward from the base section. A tip end portion of the first protruded section is provided with a hitting surface that contacts with the receiving surface of the sleeve and a second protruded section that links to the contacting surface and protrudes downward from the contacting surface.
    Type: Application
    Filed: June 18, 2008
    Publication date: January 1, 2009
    Applicant: ALPHANA Technology Co., Ltd.
    Inventors: Mitsuo Kodama, Yuji Omura
  • Publication number: 20080284275
    Abstract: A method of providing an outside rotor electric machine having a reduced radial air gap variation across an axial length of the air gap, the machine including a rotor having a cylindrical elongated portion supporting magnets and a flange extending at least partially radially from a rotating shaft, the method comprising increasing a radial deflection of the elongated portion in proximity of the flange by connecting the elongated portion to the flange through a radial spring having a stiffness lower than that of the elongated portion.
    Type: Application
    Filed: May 16, 2007
    Publication date: November 20, 2008
    Inventor: Michael Dowhan
  • Patent number: 7411325
    Abstract: A brushless permanent magnet motor has a rotor constructed of spaced ferromagnetic backirons and a circumferential array of alternating polarity magnetic poles that drive magnetic flux back and forth across an armature air gap between the backirons. A stator includes an air core armature in the air gap with three-phase windings. An inverter includes a pulse-modulated semiconductor H-bridge that switches and regulates power to the three-phase windings to drive the rotor. Harmonic losses in the motor caused by ripple currents generated by the higher pulse switching frequency in electronic variable speed drives, due to the inherently lower inductance of air core motors, are substantially reduced by adding serial inductance between the motor and drive. The H-bridge is serially electrically connected to the three-phase armature windings through three inductors that employ a low cost powder core.
    Type: Grant
    Filed: October 20, 2005
    Date of Patent: August 12, 2008
    Assignee: Revolution Electric Motor Company, Inc.
    Inventor: Christopher W. Gabrys
  • Patent number: 7119471
    Abstract: A synchronous motor includes a housing 20, a stator assembly 30 mounted within the housing 20, a rotor assembly 40 rotationally mounted within the housing 20, a rotor shaft 50 having an upper mounting surface 52 attached to the rotor assembly 40, a bearing assembly 60 coupled to the housing 20 and positioned axially between the rotor assembly 40 and the upper mounting surface 52, a slip ring assembly 70 supported by the housing 20 and positioned axially at least partially within the stator assembly 30 and the rotor assembly 40, and an encoder assembly 80 adjacent the slip ring assembly 70.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: October 10, 2006
    Assignee: Motor Kinetics, Inc.
    Inventors: Alexander D. Kiderman, John Howison Schroeder, Thomas C. Joos
  • Patent number: 6979177
    Abstract: A rotor assembly includes a housing and a hub. The housing has an open end and an opposed closed end, and is formed with a raised portion in the central location of the closed end. The hub is mounted on the closed end of the housing and covers the housing except for the raised portion to construct a thin motor.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: December 27, 2005
    Assignee: Delta Electronics, Inc.
    Inventors: Kuo-cheng Lin, Wen-shi Huang, Hsiou-chen Chang
  • Patent number: 6798987
    Abstract: A driving apparatus includes a rotor rotatable about a rotational axis and having a cylindrical magnet portion whose outer circumferential surface are divided along a circumferential direction into a plurality of differently magnetized portions, at least an outer magnetic pole portion formed extending in a direction parallel to the rotational axis of the rotor, and facing the outer circumferential surface of the magnet portion, an inner magnetic pole portion formed opposingly to the outer magnetic pole portion, and facing an inner circumferential surface of the magnet portion, and a coil for magnetically exciting the outer and inner magnetic pole portions. The coil is arranged along a direction of the rotational axis of the rotor. The rotor can be selectively held at one of three stop positions, and a condition of −0.3X+0.
    Type: Grant
    Filed: July 22, 2003
    Date of Patent: September 28, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kaori Horiike
  • Patent number: 6737769
    Abstract: An easy-to-start structure for a D.C. brushless motor comprises a base including a through-hole. Plural windings and an IC control member are mounted to the base. At least one magnetically attractive positioning member is mounted to the base and located between two windings that are adjacent to each other. A rotor comprises a shaft rotatably held by a support section in the through-hole and a permanent ring magnet mounted to the shaft, the permanent ring magnet having north and south poles, each of the south pole and the north pole having a strong magnetic area. The positioning member attracts and thus retains one of the strong magnetic areas of the permanent ring magnet in a position proximal to the positioning member when the rotor stops. Thus, the rotor rests in a pre-determined position not located in a dead corner for restarting.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: May 18, 2004
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Ching-Shen Hong, Tso-Kuo Yin
  • Patent number: 6731043
    Abstract: A spin-roll formed one-piece field core shell formed from a blank disc of sheet metal. The one-piece field core has an outer annular ring integral to and encircling a center axis of the disc and extending from a bottom external surface in a direction that is perpendicular to the bottom surface of the disc and parallel to the center axis of the disc. The core has an inner annular ring integral to and encircling a center axis of the disc, the inner annular axis is spaced radially inward from the outer annular ring and extends from the bottom external surface in a direction that is perpendicular to the bottom surface of the disc and parallel to the center axis of the disc. The one-piece field core also contains a mounting flange that encircles a center axis of the disc and extends in a perpendicular direction to a top external surface of the disc and parallel to the center axis of the disc.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: May 4, 2004
    Assignee: A. J. Rose Manufacturing Co.
    Inventors: Robert D. Pritchard, Michael Hamulak, Randy Monahan
  • Publication number: 20030090171
    Abstract: A direct current brushless motor includes a base having a receiving chamber whose one end is combined with a cover plate. The other end of the receiving chamber and the cover plate each have a shaft hole, for pivoting the rotation shaft of the rotor. A film printed circuit is mounted on the periphery of the base. The film printed circuit has at least two coil sets, a set of Hall sensing drive member, and a connecting end for connection with a power supply. The coil sets are oppositely distributed on the periphery of the base in an equally angular manner with the receiving chamber serving as a center. After the coil sets are energized, the multiple coil sets and the permanent magnet ring of the rotor may produce mutually repulsive forces, so that the rotor may be driven to rotate successively.
    Type: Application
    Filed: November 14, 2001
    Publication date: May 15, 2003
    Applicant: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Ching-Shen Hong, Tso-Kuo Yin
  • Patent number: 6172439
    Abstract: A cylindrical yoke 8 bonded to an inner surface 44 of a cylindrical portion 43 of a rotor case 40 of a motor has a yoke separating slit 85 for separating the yoke 8 in the circumferential direction. A cylindrical rotor magnet 9 is partially bonded to an inner surface 81 of the yoke 8 at a plurality of bonded portions 10 formed apart from one another for the same intervals in the circumferential direction. When the cylindrical portion 43 has been expanded by heat, the yoke separating slit 85 is expanded and the yoke 8 follows the non-bonded portion of the cylindrical portion 43. Therefore, distortion of the cylindrical portion 43 can be prevented. In the non-bonded portions 11 between the yoke 8 and the rotor magnet 9, deformation occurs such that an inner surface 81 of the yoke 8 is separated from an outer surface 92 of the rotor magnet 9. Thus, damage of the rotor magnet 9 can be prevented.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: January 9, 2001
    Assignee: Kabushiki Kaisha Sankyo Seiko Seisakusho
    Inventor: Yutaka Ishizuka
  • Patent number: 6127762
    Abstract: A rotor (1) is of a substantially spherical shape with one complete half of the sphere (2) still remaining. The rotor (1) effective takes the shape of the head of a "mushroom." The other half of the sphere has had its material removed or omitted forming the stem (3). The depth of the cut "D" and the length "L," the radius of the sphere, will determine the ratio of the respective weights of the complete half sphere (2) and the stem portion (3). Suitably the weight of the one half to the other half of the spherical body is between about 0.75 and 0.85 and more preferably 0.8. When an external force is applied to the rotor (1), it rotates simultaneously about a pair of orthogonal axes one of which is defined by the edge (6) of the spherical body between the two halves.
    Type: Grant
    Filed: September 15, 1998
    Date of Patent: October 3, 2000
    Assignee: The Pedlar Family Trust
    Inventor: Moananui Michael Kenneth Pedlar
  • Patent number: 6078121
    Abstract: A rotor assembly for a rotating machine includes a substantially cylindrical main rotor body having an outer surface. A plurality of longitudinal ribs project from the outer surface of the main rotor body. A plurality of primary recesses are defined by adjacent ribs and a secondary recess is defined in the outer surface within at least one primary recess. A magnet is positioned within at least one primary recess, and a layer of adhesive between the magnet and the outer surface of the main rotor body fills the secondary recess. Magnet retaining elements in the form of either an encapsulation layer, star-shaped retainer or elongated retaining members may also be used. The magnet retaining elements may be used alone or in combination with the adhesive layer between the magnets and the main rotor body.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: June 20, 2000
    Assignee: Emerson Electric Co.
    Inventors: Andrew F. Poag, Joseph Tevaarwerk, Ray D. Heilman, Mauro Gavello
  • Patent number: 6060805
    Abstract: A canned motor includes a rotor having a rotor core and a rotor can covering an outer circumferential surface of the rotor core, and a stator fixedly disposed around the rotor with a radial gap defined therebetween and having a stator core and a stator can covering an inner circumferential surface of the stator core. The rotor core has at least one groove defined in an outer circumferential surface thereof and extending longitudinally thereof. The rotor can has a portion pressed into the groove and held in intimate contact fully with the outer circumferential surface of the rotor core.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: May 9, 2000
    Assignee: Ebara Corporation
    Inventors: Koichi Ohtake, Tetsuya Hiramatsu, Hiroyuki Kato, Shuichiro Honda
  • Patent number: 6047461
    Abstract: A manufacturing method of a rotor for a permanent magnet-excited, high-speed electric rotary machine according to the present invention comprises, covering an outer circumferential surface of at least one permanent magnet by a fiber-reinforced plastic protection cover with prestress compressing in radial direction; inserting a steel sleeve into the at least one permanent magnet to form a permanent magnet assembly; preparing at least one permanent magnet assembly; inserting a rotor shaft into the steel sleeve while applying hydraulic pressure to an inner circumferential surface of the steel sleeve of the prepared at least one permanent magnet assembly to expand the steel sleeve; and then removing the hydraulic pressure to tight fit the at least one permanent magnet assembly onto the rotor shaft.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: April 11, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Haruo Miura, Kazuki Takahashi, Hideo Nishida, Naohiko Takahashi, Yasuo Fukushima
  • Patent number: 5973434
    Abstract: An armature coil is formed by welding upper and lower coil conductors each having a coil trunk, a pair of coil arms and a pair of coil extensions. Between an upper coil extension and a lower coil extension to be welded together, a recess is formed. This recess may be formed at the corner between a side face of an upper coil arm which is at the side of the armature core and a radially inner side face of the upper coil extension. The radially inner side face of the upper coil extension has a space against the radially outer side face of the lower coil extension only at the location where the recess is provided, while the radially inner side face except for the recess contacts the radially outer side face of the lower coil extension.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: October 26, 1999
    Assignee: Denso Corporation
    Inventors: Masahiro Soh, Masanori Ohmi, Hideki Ichikawa
  • Patent number: 5936322
    Abstract: A permanent magnet type synchronous motor has a stator having teeth that are circumferentially aligned, and a rotor disposed radially inward of the stator. The rotor is made up of permanent magnets facing the teeth and mounted on a rotor core having protrusions that protrude radially outward between the permanent magnets. To suppress cogging, the width of the protrusions is determined such that the inter-pole core central angle .theta. is in the range: .theta..sub.MIN <.theta..ltoreq..theta..sub.MIN where .theta..sub.MIN is the angle formed between two straight lines extending from the center of the rotor shaft to midpoints of the two tooth side faces that are the farthest apart from each other among the tooth side faces of teeth facing one of the protrusions, and .theta..sub.
    Type: Grant
    Filed: December 26, 1996
    Date of Patent: August 10, 1999
    Assignee: Aisin Aw Co., LTD.
    Inventors: Yasuo Yamaguchi, Masahiro Hasebe
  • Patent number: 5929551
    Abstract: A rotor assembly for a synchronous reluctance machine has a plurality of steel punched star-shaped supports secured along a shaft at spaced locations for retaining a plurality of laminated rotor sections. The star-shaped supports have four equiangularly spaced arms having arcuate valleys disposed therebetween that define a plurality of channels for receiving the rotor sections. The rotor sections have a plurality of linearly-disposed apertures for receiving mounting members that extend radially from the valleys of the star-shaped supports. The portions of free ends of the mounting members that extend through the apertures, are stamped or formed to secure the rotor sections to the star-shaped supports. A rotor bar may be disposed within a concave cavity defined by the rotor sections to reduce audible noise produced as the rotor rotates at a high rate of speed.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: July 27, 1999
    Assignee: General Motors Corporation
    Inventors: Ahmed Mostafa El-Antably, Moshen M. Erfanfar
  • Patent number: 5777418
    Abstract: A transverse flux motor includes an outer stator having a plurality of outer stator soft iron elements which are substantially disposed with uniform separation from one another. The flux motor further includes an inner stator having a plurality of inner stator soft iron elements. The inner stator further includes at least one anchor winding. The motor has a rotor which, looking at it in a section perpendicular to the axis, is built of alternating magnets and soft iron elements. The outer stator is free from anchor windings. Also, the outer stator soft iron elements are disposed in such a way that at least one gap region is provided which is larger than the space provided between the remaining neighboring stator soft iron elements. At least indirect means are provided in this region to compensate magnetic end effects.
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: July 7, 1998
    Assignee: Voith Turbo GmbH
    Inventors: Andreas Lange, Stefan Koll
  • Patent number: 5763976
    Abstract: A stator wound resolver comprising: a stator and a rotor aligned on an axis; the stator having a plurality of teeth with input and output windings disposed on some or all of the teeth, the input and output windings exhibiting a mutual inductance characteristic that varies as a function of position of the rotor about the axis; the input winding being connectable to a drive signal and the output windings being disposed on the teeth such that output signals induced in the output windings correspond to position of the rotor; the rotor being attachable to a position changing means, the rotor comprising at least two axially spaced rotor pieces that are offset from each other by a stagger angle such that a portion of harmonic distortion produced by one of the rotor pieces is reduced by complementary harmonic distortion produced by another of the rotor pieces.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: June 9, 1998
    Assignee: Parker-Hannifin Corp.
    Inventor: Steven R. Huard
  • Patent number: 5739613
    Abstract: A three-phase reluctance type motor flat in shape and capable of generating a large output torque and rotating at high speeds, comprising a flat stationary armature (16) having a circumferential surface provided with three multiplied by integral number of magnetic poles wound by first, second and third phase armature coils, salient poles of a magnetic rotor (1) fixed to the inside of the outer periphery of a cup-shaped rotor (3), and a current supply control circuit for obtaining first, second and third phase position detecting signals responsive to the position of the salient poles and for quickly supplying current to the first, second and third phase armature coils based on these position detecting signals, so as to realize a high-speed rotation.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: April 14, 1998
    Assignee: Kabushikigaisha Sekogiken
    Inventor: Itsuki Bahn
  • Patent number: 5739615
    Abstract: A rotor for a reluctance machine comprises a rotor made up of a stack of laminations defining a cross-sectionally integral rotor profile consisting of rotor poles arranged about a rotor core. A non-magnetic insert is arranged axially along the stack of laminations and a filler spans the interpole region between rotor poles. The filler is attached at either end of the rotor to an end cap and is secured to the insert intermediate the rotor ends. The insert provides a means of securement for the filler to provide stability at high speed.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: April 14, 1998
    Assignee: Switched Reluctance Drives Limited
    Inventor: Michael Leo McClelland
  • Patent number: 5731648
    Abstract: One aspect of the invention is a rotor core for use with a permanent ring magnet in an electric motor which serves to minimize and evenly distribute thermal stresses in the rotor without undermining the efficiency of the motor by distorting the flux return to the ring magnet. According to one embodiment, the rotor core comprises a plurality of laminated plates. Each of the plates has a rim with a circular outer perimeter, a hub concentric with the outer perimeter of the rim, and first and second sets of curved spokes coupling the hub to the rim. Each spoke of the first set of curved spokes is concave in a clockwise direction and each spoke of the second set of curved spokes is concave in a counter-clockwise direction. According to another embodiment, the rotor core comprises a plurality of laminated structurally-identical perforated plates having obverse and reverse sides such that the obverse side of each plate faces the obverse side of an adjacent plate.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: March 24, 1998
    Assignee: Globe Motors
    Inventors: Brian F. Gaughan, L. Jay Batten
  • Patent number: 5682670
    Abstract: A method of forming a multipole magnet wherein two backing sheets of paper or film material are screen or stencil printed with an ink containing magnetic particles and a carrier material to provide respective complementary patterned areas thereon, the patterned areas of ink are cured or dried, the respective ink patterns are magnetized using a magnetic field perpendicular to a plane of the backing sheets, and the sheets are combined into a laminate wherein the patterned areas are located between the two sheets.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: November 4, 1997
    Assignee: Magnet Applications Limited
    Inventors: James Fraser Bell, Steven Roy Jeffrey, John Stewart Campbell, Lyn Holt
  • Patent number: 5650680
    Abstract: A permanent magnet generator includes an annular stator with windings on the inner face. A round rotor is rotatably mounted in the stator, and includes a plurality of circumferentially spaced rectangular openings inwardly of the outer peripheral portion of the core. Radial U-shaped grooves are formed between the openings. A magnetic unit, including a rectangular permanent magnet and an abutting magnetic conductive shim, is close-fitted within each opening. The core includes core lamination and separate end laminations of a structure corresponding to the core laminations. The end laminations are rotated about an axis through the core to offset the magnetic unit openings with respect to the magnetic unit opening of the core laminations. The laminations are riveted together, with the offset end lamination retaining the magnetic units within the core.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: July 22, 1997
    Assignee: Marathon Electric Mfg. Co.
    Inventor: Stanley S. Chula
  • Patent number: 5422527
    Abstract: An induction motor rotor unit adapted to support and rotate an X-ray target anode in an X-ray tube comprises a stacked array of very thin highly magnetic annular laminations on a cylindrical carrier. Gold plated copper conductor bars are placed in longitudinal coaxial slots in the circumference of the rotor. Gold plated end rings on the carrier abut each end of the stacked array and conductor bars. In a vacuum furnace the gold plating is caused to melt and diffuse into contiguous components to bond the rotor as an integral unit.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: June 6, 1995
    Assignee: General Electric Company
    Inventor: Jamie E. Lazzaro