Banding Around Magnet Patents (Class 310/156.31)
  • Patent number: 10208431
    Abstract: A magnetic levitation system includes a guideway and a vehicle. The guideway has ferromagnetic yokes and induction coils. The vehicle has levitation magnets for magnetic interaction with the ferromagnetic yokes wherein the vehicle levitates relative to the guideway. The vehicle has stabilization magnets coupled thereto for electromagnetic interaction with the induction coils as the vehicle travels along the guideway. Each stabilization magnet is a permanent magnet with a two-dimensional pattern of poles alternating in polarity in a first dimension and a second dimension.
    Type: Grant
    Filed: January 22, 2018
    Date of Patent: February 19, 2019
    Inventor: John Van Rosendale
  • Patent number: 10170972
    Abstract: A Halbach magnetic array is disclosed, including a plurality of first and second magnetic units alternately arranged in a width direction, wherein: each first magnetic unit includes first magnetic groups and first magnetic columns alternately arranged in a length direction, each first magnetic group includes four first magnetic bars arranged in a 2*2 matrix; each second magnetic unit includes second magnetic groups and second magnetic columns alternately arranged in the length direction, each second magnetic group includes four second magnetic bars arranged in a 2*2 matrix; each first magnetic column is magnetized in a height direction, and each second magnetic column is magnetized in a direction opposite to the height direction. A magnetic suspension vibration damper is also disclosed.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: January 1, 2019
    Assignee: SHANGHAI MICRO ELECTRONICS EQUIPMENT (GROUP) CO., LTD.
    Inventor: Liwei Wu
  • Patent number: 9608484
    Abstract: A motor includes a first rotor and a second rotor which are disposed at opposite sides of a stator, and each of the first rotor and the second rotor includes a plurality of modules, each including a pair of permanent magnets and a connection unit which connects ends of the permanent magnets.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: March 28, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jin-Woo Cho, Seong-Taek Lim
  • Patent number: 9561608
    Abstract: A sensor unit with a sensing surface molded properly on an outer surface of a sensor receiving part is provided. The sensor unit includes a resin casing formed with an annular fixing member, and a sensor receiving part formed in the casing for receiving a sensor housed. A sensing surface that faces a target object is formed within the sensor receiving part. A resin charging position in molding the casing is set to a position deviated circumferentially from a central position in a width of the sensing surface. In particular, resin is charged into the fixing member from a gate arranged on an extending line of a first through-bore formed in a position corresponding to the charging position.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: February 7, 2017
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Koji Kawasaki, Kazuhiro Adachi, Kyoichi Okamura
  • Patent number: 9515529
    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. The magnet holders define passages for airflow between the inside top and magnet surface. In this manner, permanent magnets may be installed on the magnet carrying structure and provided with additional cooling via said passages. Further, the holders may be configured to secure the magnets by an interference fit, without using bolts or adhesives, to facilitate both assembly and removal for maintenance and repair.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 6, 2016
    Assignee: Northern Power Systems, Inc.
    Inventors: Jonathan A. Lynch, Mark S. Piercey, Peter P. Mongeau
  • Patent number: 9018817
    Abstract: The present invention relates to a retaining band which provides outer reinforcement for the rotor assembly of a high speed electrical machine. The rotor assembly includes a plurality of circumferentially-spaced permanent magnet assemblies. A retaining band is fitted around the rotor assembly and applies a pre-load to the permanent magnet assemblies in the radial direction. The retaining band has a plurality of voids that are sized and shaped to provide the retaining band with a progressive spring stiffness in the radial direction. The voids are open before the retaining band is fitted and during the fitting process the retaining band is deflected in the radial direction so that the voids close up and the retaining band becomes substantially solid.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: April 28, 2015
    Assignee: GE Energy Power Conversion Technology Limited
    Inventor: Stuart Ian Bradley
  • Patent number: 8878409
    Abstract: A rotor has a rotor body for rotation about a shaft. A plurality of permanent magnets are spaced circumferentially about the rotor body. A containment band is positioned radially outwardly of the permanent magnets. The containment band has a containment band coefficient of thermal expansion. The permanent magnets have a permanent magnet coefficient of thermal expansion, taken parallel to a magnetic alignment. A ratio of the containment band coefficient of thermal expansion to the permanent magnet coefficient of thermal expansion is less than or equal to 1.15.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: November 4, 2014
    Assignee: Hamilton Sundstrand Space Systems International, Inc.
    Inventors: Craig R. Legros, Roy D. Rasmussen
  • Patent number: 8872396
    Abstract: A rotor of an electric motor is provided in which a permanent magnet holding member can be assuredly fixed to a rotor main body and the rotor main body can be easily worked and inexpensively manufactured. In the rotor, a plurality of permanent magnets 21 are held in a permanent magnet holding member 29 made of a synthetic resin and fixed to an outer peripheral part of a cylindrical rotor main body 28. An outer peripheral surface of the rotor main body 28 is a cylindrical surface. Rotation prevention recessed parts 30 are formed at a plurality of parts in the circumferential direction of the outer peripheral part in both end parts of the rotor main body 28. The permanent magnet holding member 29 includes annular parts 31 which come into close contact with the outer peripheral parts of both end faces of the rotor main body 28 and connecting parts 32 which connect both the annular parts 31 on the outer peripheral surface of the rotor main body 28 and hold the permanent magnets 21.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: October 28, 2014
    Assignee: Jtekt Corporation
    Inventors: Takatoshi Sakata, Akihiko Kawano
  • Patent number: 8698367
    Abstract: An electric machine is provided including a rotor having a plurality of magnets retained on the rotor. The plurality of magnets are retained via a sleeve. The sleeve is retained via a band. The band includes a stacked plurality of washer laminations. Each of the plurality of washer laminations is electrically insulated from an adjacent washer lamination.
    Type: Grant
    Filed: April 16, 2009
    Date of Patent: April 15, 2014
    Assignee: Synchrony, Inc.
    Inventors: Christopher Sortore, Victor Iannello, Robert Jett Field
  • Publication number: 20140070634
    Abstract: A rotor has a rotor body for rotation about a shaft. A plurality of permanent magnets are spaced circumferentially about the rotor body. A containment band is positioned radially outwardly of the permanent magnets. The containment band has a containment band coefficient of thermal expansion. The permanent magnets have a permanent magnet coefficient of thermal expansion, taken parallel to a magnetic alignment. A ratio of the containment band coefficient of thermal expansion to the permanent magnet coefficient of thermal expansion is less than or equal to 1.15.
    Type: Application
    Filed: September 13, 2012
    Publication date: March 13, 2014
    Inventors: Craig R. Legros, Roy D. Rasmussen
  • Publication number: 20140009024
    Abstract: A rotor for an electrical machine includes a base body, a plurality of permanent magnets which are arranged axially in rows on an outer surface of the base body. At least two of the permanent magnet rows are arranged so as to be mutually offset in an axial direction. First and second locking plates are respectively arranged at axial end faces of the base body to secure the rows of permanent magnets in the axial direction, with the first and second locking plates each having a surface which rests on respective axial ends of the permanent magnet rows. A bandage is wound around the base body to fix the permanent magnets to the outer surface of the base body.
    Type: Application
    Filed: July 8, 2013
    Publication date: January 9, 2014
    Inventor: Bruno Heim
  • Patent number: 8624456
    Abstract: A rotor (300) for an axial-flux electrical machine is disclosed. The rotor has a plurality of permanent magnets (350) fixed thereto, with each of the plurality of magnets extending at least partly through an aperture in the rotor. The arrangement is such that material of the rotor (200) abuts each magnet (350) so as to locate the magnet substantially circumferentially with respect to the axis of rotation of the rotor and substantially axially in at least one axial direction. The magnets (350) may slide radially onto the rotor (300) and be constrained axially and circumferentially by a tongue-and-groove arrangement (325, 355), with reinforced tape (340) being wound around the radially outer edge thereof to provide radial constraint.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: January 7, 2014
    Assignee: EVO Electric Limited
    Inventors: Michael Ulrich Lamperth, Malte Jaensch
  • Publication number: 20130257212
    Abstract: A permanent magnet motor, generator or the like that uses ceramic magnets in the rotor to concentrate the magnetic flux in the airgap. Poles are formed by pole plates with integral tabs forming north and south poles with magnetic separators therebetween. Magnet sections are stacked axially.
    Type: Application
    Filed: April 3, 2012
    Publication date: October 3, 2013
    Applicant: LCDRIVES CORP.
    Inventors: Russel Hugh Marvin, Nigel Shepherd
  • Patent number: 8339005
    Abstract: An assembly for mounting magnets on a steel sheet rotor pack, the assembly including a plurality of baseplates made of a magnetic material and fixed to the rotor pack, and a plurality of magnets being in turn fitted to each baseplate. In one embodiment, the baseplates are fixed to the rotor pack by means of inner locking bars housed in axial ducts provided inside said rotor pack. The baseplates are fitted to the inner locking bars by fixing means passing through longitudinal channels connecting the axial ducts and the outer surface of the rotor pack.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: December 25, 2012
    Assignee: Indar Electric S.L.
    Inventors: Adolfo Rebollo Gomez, Xabier Calvo Madariaga, Jose Antonio Estibariz Aristi, Gaizka Diaz Barrenetxea, Jon Vaquerizo Ayastuy, Nestor Churruca Gabilondo, Javier Sanchez Castaño, Marta Avis Plata, Julen Legorburu Aramburu
  • Patent number: 8294319
    Abstract: The invention is characterized in that in a motor rotor constituted by a motor shaft (30), a permanent magnet (31) surrounding the motor shaft (30) around an axis, a pair of end rings (32, 32) surrounding the motor shaft (30) around the axis and pinching the permanent magnet (31) from both sides in an axial direction, and a hollow cylindrical outer sleeve (33) surrounding the permanent magnet (31) and a pair of end rings (32, 32) in a fastening state around the axis, one end portion or both end portions of the outer sleeve (33) protrudes in the axial direction than an end surface of the end ring (32). A rotating balance correction is executed by pruning away a part of the protruding portion.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: October 23, 2012
    Assignee: IHI Corporation
    Inventors: Yasuyuki Shibui, Masahiro Shimizu
  • Patent number: 8283833
    Abstract: A rotor for an electric rotary machine and a method of manufacturing the same are disclosed wherein none of permanent magnets is fixed to a magnetic supporting segment of a magnet support ring in advance and each permanent magnet is assembled separately of the magnet support ring. Prior to the assembling of the permanent magnets, the magnet support ring is preliminarily located on claw-shaped magnetic poles at inner peripheral sides thereof under a state combined with a pair of field iron cores, after which the permanent magnets are inserted to magnet insertion spaces in longitudinal directions. The rotor includes positioning and restricting means for precluding the occurrence of positional displacement of each permanent magnet with respect to each magnet supporting segment of the magnet support ring.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: October 9, 2012
    Assignee: Denso Corporation
    Inventors: Koji Kondo, Yoshinori Hayashi
  • Patent number: 8264119
    Abstract: A rotor (10) for a rotary electric machine which comprises: two field spiders (12) each of which runs more or less radially with respect to the main axis of the rotor (10) and comprises a series of axial arms (20) in which each arm (20) runs axially inwards from the associated field spider (12), towards the other field spider (12) in such a way that each arm (20) of a field spider (12) lies in the space there is between two consecutive arms (20) of the other field spider (12); and at least one magnetic element (24) the main orientation of which is longitudinal position transversely between two adjacent arms (20) belonging one to each field spider (12) and which comprises at least one magnet (28), characterized in that the magnetic element (24) comprises at least one support shim (30) made of a non-magnetic material and mounted on a transverse end face of the magnet (28), and means of connecting the shim (30) to the magnet (28).
    Type: Grant
    Filed: November 24, 2006
    Date of Patent: September 11, 2012
    Assignee: Valeo Equipements Electriques Moteur
    Inventor: Jean-Philippe Badey
  • Publication number: 20120025654
    Abstract: A rotor for a permanent magnet synchronous machine includes a basic body defining a center. Permanent magnets are arranged on a circumferential surface of the basic body to thereby form magnetic poles. Each magnetic pole is formed in a circumferential direction by at least two permanent magnets and defined by a pole center and a pole edge, wherein the pole edge is spaced from the center of the basic body at a distance which is smaller than a distance of the pole center to the center of the basic body. Positioned in sections between the pole centers of adjacent pole are filling elements, with a banding securing the filling elements on the permanent magnets in such a way that the rotor has a substantially cylindrical circumferential surface.
    Type: Application
    Filed: February 1, 2011
    Publication date: February 2, 2012
    Applicant: Siemens Aktiengesellschaft
    Inventors: Dominik Bach, Daniel Mader, Rolf Vollmer
  • Patent number: 8084910
    Abstract: The object of the invention is a rotor for a permanent-magnet synchronous machine in which a pole structure is fitted onto the surface of the rotor body structure facing the air gap. Each of the rotor's pole structures comprises at least one permanent magnet and a shell structure fitted on top of it. According to the invention, an intermediate layer made of magnetic composite is fitted between the permanent magnet and the shell structure.
    Type: Grant
    Filed: December 23, 2005
    Date of Patent: December 27, 2011
    Assignee: ABB Oy
    Inventor: Eino Silander
  • Patent number: 8076812
    Abstract: A structure for arranging a permanent magnet suitable for a rotor core having a thin, circular, hollow ring section and a structure for reducing the amount of the permanent magnet are provided.
    Type: Grant
    Filed: September 4, 2009
    Date of Patent: December 13, 2011
    Assignees: Hyundai Motor Company, Hyundai Motor Japan R&D Center, Inc., Kia Motors Corporation
    Inventor: Nishimura Hiroshi
  • Patent number: 8009001
    Abstract: Higher-order Halbach permanent magnet arrays that produce higher flux densities in the air gaps of electromotive machines are described. In one embodiment, a second order “Hyper” Halbach array includes a plurality of magnets arranged immediately adjacent to each other so as to define a rectangular matrix having rows and columns in which the respective magnetic fields of a first row of the array are arranged so as to define a conventional first order Halbach array, and, proceeding in a column direction of the array, the respective magnetic fields of the magnets of each of a second and succeeding rows of the array are respectively rotated counter-clockwise about an axis perpendicular to the column direction of the array through successive 90 degree rotations relative to those of the immediately preceding row.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: August 30, 2011
    Assignee: The Boeing Company
    Inventor: Mark A Cleveland
  • Patent number: 7965009
    Abstract: A motor rotor has a resin-impregnated thread layer formed by winding a thread of a reinforced fiber material around a permanent magnet layer with a gap between an outer peripheral surface of the thread layer and an inner peripheral surface of a cylindrical body, and impregnating the thread layer with a curable resin. A subsequent thread layer is formed by leading a continuous thread into an annular passage through thread passing recesses, winding the continuous thread around a bottom portion of the passage, and impregnating the subsequent thread layer with a curable resin. A curable resin is injected into the gap between the outer peripheral surfaces of the thread layer and the subsequent thread layer and the inner peripheral surface of the cylindrical body through resin injection passages and/or the thread passing recesses before heating and curing.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: June 21, 2011
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Toshihito Miyashita, Takashi Matsushita, Norihito Tanaka
  • Patent number: 7948134
    Abstract: A permanent magnet (PM) rotor has a plurality of partial laminated stacks that are interspaced in the axial direction at a defined distance, thereby defining radial cooling slots. Permanent magnets are arranged in every partial laminated stack in inner pockets. The dimension of every permanent magnet in the axial direction does not or only insignificantly exceed the axial dimensions of the respective partial laminated stack. During assembly, the permanent magnets can be axially pushed through the inner pockets to the respective partial laminated stack (20). The rotor has a very high degree of efficiency.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: May 24, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andreas Jöckel, Thomas Schmidt
  • Patent number: 7906883
    Abstract: A rotor includes a rotor frame having a plurality of ribs which are disposed at predetermined intervals in a circumferential direction and which extend in a radial direction, and a shaft portion and a rim portion which are provided at inside diameter sides and outside diameter sides of the plurality of ribs, respectively, main magnet portions which are disposed individually between the ribs which are adjacent to each other in the circumferential direction, and a plurality of sub-magnet portions which are disposed on at least one sides of the ribs in the rotational axis direction, and wherein a rigid portion is formed in an area where the sub-magnet portions are projected in the radial direction relative to an area where the rib is projected in the radial direction in a cross section of the rim portion taken along the rotational axis direction.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: March 15, 2011
    Assignee: Honda Motor Co., Ltd.
    Inventor: Shoei Abe
  • Patent number: 7876011
    Abstract: A method is provided for encapsulating permanent magnets of a rotor of a generator. Magnets, which are shorter than a rotor yoke in an axial direction, are placed outside of the yoke leaving a short portion of the yoke free at both ends. Spacers of a non-magnetic material are placed between the magnets. End barriers are placed on the free portions of the yoke. A thin sheet of a non-magnetic material is folded around the magnets and the spacers, covering the entire length of the rotor, including the barriers. An air tight membrane is placed on the outside of the sheet and sealed to the ends of the yoke so that the membrane and the yoke together form an air tight enclosure. A vacuum is applied to the air tight enclosure between the membrane and the yoke. Resin is infused into the air tight enclosure and set.
    Type: Grant
    Filed: April 29, 2009
    Date of Patent: January 25, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventor: Henrik Stiesdal
  • Publication number: 20100320859
    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: Application
    Filed: June 23, 2009
    Publication date: December 23, 2010
    Applicant: Hamilton Sundstrand Corporation
    Inventor: Richard A. Himmelmann
  • Publication number: 20100244607
    Abstract: In a rotor of a permanent magnet rotary electric machine, a bonding portion between each of segment shaped magnets and an outer circumference face of a rotor core is provided in axial symmetry with respect to the rotor axial center and has a bonding area equal to or larger than a half of a contact area between each of the segment shaped magnets and the outer circumference face of the rotor core; and a biasing force is applied to an outer circumference face of the segment shaped magnets by a ring.
    Type: Application
    Filed: August 14, 2009
    Publication date: September 30, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kengo FUJIMOTO, Yoshihito Asao, Satoru Akutsu, Kazuhisa Takashima
  • Patent number: 7768169
    Abstract: The present invention provides a permanent magnet rotor arrangement that is particularly suitable for low-speed large-diameter electrical generators. The arrangement includes a rotor 2 having a radially outer rim 4. A circumferential array of magnet carriers 12 is 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: May 24, 2007
    Date of Patent: August 3, 2010
    Assignee: Converteam UK Ltd
    Inventor: Paul Eaton Clark
  • Patent number: 7687957
    Abstract: Holder anchoring grooves are arranged on the outer periphery of a rotor core so as to extend axially. A holder arm having a substantially T-shaped cross section is fitted to each of the holder anchoring grooves. The holder arm has a main body section, an engaging projection and magnet holding pieces. The engaging projection is engaged with the corresponding one of the holder anchoring grooves. Each of the magnet holding pieces includes a first contact section, a second contact section and a non-contact area. A magnet containing section is defined by the magnet holding pieces that are located vis-à-vis relative to each other of any two adjacently located holder arms and the outer peripheral surface of the rotor core. In the magnet containing sections, a rotor magnet is press fitted and anchored from the shaft direction. Thus, there is provided a magnet fixing structure that can accurately anchor magnets to a rotor core or the like at low cost.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: March 30, 2010
    Assignee: Mitsuba Corporation
    Inventors: Takayuki Ochiai, Satoru Negishi
  • Publication number: 20090261678
    Abstract: Certain exemplary embodiments can provide a system, machine, device, manufacture, circuit, and/or method adapted for providing an electric machine comprising: a rotor comprising a plurality of magnets retained on said rotor via a sleeve that is retained via a band comprising a stacked plurality of washer laminations, each of said washer laminations electrically insulated from an adjacent washer lamination.
    Type: Application
    Filed: April 16, 2009
    Publication date: October 22, 2009
    Inventors: Christopher K. Sortore, Victor Iannello, Robert Jett Field
  • Publication number: 20090072639
    Abstract: A composite rotor for an axial airgap, permanent magnet dynamoelectric machine comprises a plurality of magnet subassemblies adhesively bonded together to form the rotor. Each magnet subassembly comprises a rotor permanent magnet and an optional spacer. A fibrous belt is wrapped around the periphery of each subassembly to provide high tensile strength at least along the radial sides of the subassembly. The belt is preferably infiltrated with an adhesive agent, such as an epoxy resin, that is used to bond the subassemblies. The rotor is thereby provided with high strength and low mass, making it suitable for use in a high-speed, high pole count electric machine.
    Type: Application
    Filed: September 19, 2007
    Publication date: March 19, 2009
    Inventors: Richard Lex Seneff, Andrew D. Hirzel
  • Publication number: 20080238234
    Abstract: The segmented permanent-magnet rotor for high-speed synchronous machines reduces eddy-current losses by axially segmenting the containment sleeve and the permanent magnets. The axial segmentation of the containment sleeve includes forming grooves circumferentially around the outer surface of the containment sleeve. The circumferential grooves disrupt the generation of eddy currents on the outer surface of the containment sleeve and therefore reduce eddy-current losses in the containment sleeve. Axial segmentation of the permanent magnets also disrupts eddy current formation, thereby reducing eddy current losses in the permanent magnets. In addition, the presence of an electrically insulating layer between the containment sleeve and the permanent magnets reduces eddy current migration from the containment sleeve to the permanent magnets, and therefore provides additional reduction of eddy-current losses.
    Type: Application
    Filed: March 27, 2007
    Publication date: October 2, 2008
    Applicant: Hamilton Sundstrand Corporation
    Inventors: Daniel M. Saban, Laurence D. Vanek
  • Patent number: 7365465
    Abstract: A rotor structure for an electric motor includes a cylindrical rotor core assembly and a plurality of permanent magnets disposed on an outer circumference of the rotor core assembly. Wrapped around the rotor core assembly is a bandage to secure the permanent magnets in place, wherein the bandage has a bandage edge arranged in proximity of an end surface of the rotor core assembly. In order to securely fix the bandage edge in place, a securing ring is disposed radially over the bandage edge of the bandage to hold the bandage against the rotor core assembly.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: April 29, 2008
    Assignee: Siemens Aktiengesellschaft
    Inventor: Felix Ludwig
  • Patent number: 7365464
    Abstract: A rotor is disclosed for a galvanometer system. A rotor includes a permanent magnet core, a sleeve and at least one shaft unit. The sleeve encloses and attaches to at least a portion of the permanent magnet core. The sleeve is formed of a material having a density of less than about 0.283 lb/in3. The shaft unit is attached to both the permanent magnet core and to the sleeve. An output device may be coupled to the shaft unit, and the shaft unit is formed of a material having a dynamic stiffness of at least about 1.00×109 lb in7/slug.
    Type: Grant
    Filed: September 1, 2004
    Date of Patent: April 29, 2008
    Assignee: GSI Group Corporation
    Inventor: David C. Brown
  • Patent number: 7309938
    Abstract: A rotary power converter apparatus for coupling power between a prime driver and plural generators. The apparatus includes a frame having a first and second bearing aligned along an axis of rotation and a rotor assembly supported thereby. The rotor assembly includes a shaft fabricated from a light weight material that is rotatably supported along the axis of rotation by the first and second bearings. There is a prime-driver rotor assembly, that has a magnetic structure supported by a light weight non-magnetic alloy hub that is fixed to rotate with the shaft. There are also plural generator rotor assemblies, each having a permanent magnet structure supported by a light weight non magnetic alloy hub also fixed to rotate with the shaft. A prime driver stator assembly is fixedly supported by the frame and aligned concentric with the prime driver rotor assembly to enable magnetic coupling of power therewith.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: December 18, 2007
    Inventor: Kelly S. Smith
  • Patent number: 7228616
    Abstract: A system and method for manufacturing an electrical machine is provided. An array of permanent magnet segments is assembled around a rotor spindle. Desired orientation directions of the permanent magnet segments are determined. The assembled permanent magnet segments are then positioned in a magnetization fixture such that the desired orientation directions of the permanent magnet segments are aligned with corresponding flux directions of the magnetizing fixture.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: June 12, 2007
    Assignee: General Electric Company
    Inventor: Charles Michael Stephens
  • Patent number: 7112906
    Abstract: A motor rotor. The motor rotor adapted to be used in a fan includes a hub, a metal plate and a magnet. The metal plate has a first end and a second end. The metal plate is disposed in the hub. The magnet is disposed in the metal plate. A method for manufacturing a motor rotor mentioned includes providing a metal plate having a first end and a second end; connecting the first and second ends to shape the metal plate as a ring; placing the metal plate in a hub; and placing a magnet in the metal plate.
    Type: Grant
    Filed: February 18, 2004
    Date of Patent: September 26, 2006
    Assignee: Delta Electronics, Inc.
    Inventors: Yi-Fang Chou, Tsu-Liang Lin, Kuo-Cheng Lin, Wen-Shi Huang
  • Patent number: 7053508
    Abstract: In a rotor for a rotary electric machine, a predetermined number of main pole magnets and a predetermined number of yoke magnets are fixed in contact with a hub. Each main pole magnet is magnetized so that its radial inside portion and its radial outside portion have the opposite polarity from each other, of north pole and south pole. Also, each main pole magnet has its radial inside and radial outside polarities reversed from its closest main pole magnets. The yoke magnets are disposed to allow magnetic flux to flow through circumferential surfaces of the main pole magnets. The hub is provided as a heat radiating member and made of metal having high heat conductivity. The hub includes an inner cylindrical portion and an outer cylindrical portion, and forms an air passage spaces.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: May 30, 2006
    Assignee: Denso Corporation
    Inventors: Shin Kusase, Takeo Maekawa, Toru Onishi
  • Patent number: 6995489
    Abstract: An electric machine (2) comprising a rotor (4) and a stator (6) arranged coaxially therewith, at least one of said rotor (4) and stator (6) being formed of a plurality of parts and there being provided a bandage (16) holding together the plurality of parts of said rotor and/or stator (6), wherein the bandage (16) is formed of an electrically non-conducting fiber material having a coefficient of thermal expansion similar to the coefficient of thermal expansion of the parts of said rotor (4) and/or stator (6).
    Type: Grant
    Filed: June 3, 2003
    Date of Patent: February 7, 2006
    Assignees: Magnet-Motor Gesellschaft fur, Magnet-Motorische Technik mbH
    Inventors: Peter Ehrhart, Anton Mueller
  • Patent number: 6906444
    Abstract: Each permanent magnet formed in an open-letter shape is divided into a plurality of parts, the divided magnets are respectively fitted in open letter-shaped inserting portions, and ribs are respectively provided in dividing portions of the permanent magnets. Accordingly, it is possible to prevent the breakage of pole connecting portions at an outermost periphery of the rotor as adjacent inner peripheral-side permanent magnets directly come into contact with and push the outer peripheral-side permanent magnets. Alternatively, an annular nonmagnetic material is provided on an outer peripheral portion of the rotor so as to cover the open letter-shaped permanent magnets and magnetic material portions inside the open-letter portions, whereby the rotor core is made resistant against breakage, and the flux leakage is minimized.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: June 14, 2005
    Assignee: Teijin Seiki Co., Ltd.
    Inventors: Masakazu Hattori, Naohiro Makino
  • Patent number: 6897597
    Abstract: An alternator for a vehicle comprises two pole pieces having interlaced poles (10) and magnets, the poles exhibiting grooves profiled along an axis (21) and accommodating the magnets, the profile completely preventing the magnets escaping from the grooves in a plane perpendicular to the axis (21). It has, for each magnet (20), a strip (24) interposed between one face (25, 27) of the magnet and at least one of the grooves (18), the strip (24) being produced from a material which is less hard than the magnet.
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: May 24, 2005
    Assignee: Valeo Equipments Electriques Moteur
    Inventors: Paul Armiroli, Jean-Philippe Badey, Denis Gravat
  • Patent number: 6833647
    Abstract: The present invention relates to a discoid machine having a rotor and a stator placed facing each other along the axis of rotation of the rotor. The machine is synchronous and has at least two rotors disposed on either side of a stator.
    Type: Grant
    Filed: July 12, 2002
    Date of Patent: December 21, 2004
    Assignee: Moteurs Leroy-Somer
    Inventors: Jacques Saint-Michel, Atef Abou-Akar
  • Patent number: 6815864
    Abstract: An ac generator comprising a rotor coil for generating a magnetic flux, a pole core disposed to cover the rotor coil and having pawl-shaped magnetic poles projecting in staggered and alternating relationship, permanent magnets disposed on both side surfaces of the pawl-shaped magnetic poles for reducing the leakage of the magnetic flux, and a fan for cooling. The permanent magnets are samarium-iron alloy magnets containing Ti and B, or plastic magnets made of magnet powder bonded together by a resin, bonded magnets of Sm8.2—Fe75.6—Ti2.3—B0.9—N13. One portion of the side opposing to the pawl-shaped magnetic pole side surfaces of the permanent magnet may be resin-coated. A restricting means for restricting the displacement of the magnetic pole in the radial direction may be disposed in the vicinity of the tips of the magnetic poles.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: November 9, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Katsunori Tanaka, Yoshihito Asao
  • Patent number: 6664690
    Abstract: For achieving a constant capacity range by way of field weakening of a permanent magnet excited drive the magnetic transverse resistance (Rm) of the rotor plate pack is increased by pole gaps (P1, P2), which are produced by milling into the upper surface (O) of the rotor plate section (L), or are punched into the rotor plate section (L), whereby a covering of the poles of Tp in the range of from 70% to 80% has been shown to be particularly advantageous.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: December 16, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventor: Gerhard Huth
  • Publication number: 20030193255
    Abstract: A rotor structure for an electric motor includes a cylindrical rotor core assembly and a plurality of permanent magnets disposed on an outer circumference of the rotor core assembly. Wrapped around the rotor core assembly is a bandage to secure the permanent magnets in place, wherein the bandage has a bandage edge arranged in proximity of an end surface of the rotor core assembly. In order to securely fix the bandage edge in place, a securing ring is disposed radially over the bandage edge of the bandage to hold the bandage against the rotor core assembly.
    Type: Application
    Filed: March 31, 2003
    Publication date: October 16, 2003
    Applicant: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Felix Ludwig
  • Patent number: 6424072
    Abstract: The vehicle alternator comprises a rotor having interleaved pole pieces, permanent magnets disposed between the pole pieces, and at least one magnet-support strip which extends over a circumferential outside face of the pole pieces.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: July 23, 2002
    Assignee: Valeo Equipments Electriques Moteur
    Inventors: Paul Armiroli, Jean-Philippe Badey
  • Publication number: 20010045786
    Abstract: A spindle motor rotor having windows at plural places in a flange of a rotor yoke of a spindle motor, as well as projections protruding outwards through the windows, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, wherein the rotor magnet is joined to the rotor yoke by welding these projections and one of the projections stretches over both an N pole and an S pole of the rotor magnet.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 29, 2001
    Applicant: Alps Electric Co., Ltd.
    Inventor: Mikio Sekine