With Casting Material Around The Magnet Patents (Class 310/156.23)
  • Patent number: 10211692
    Abstract: The present invention provides a permanent magnet motor, in which three holes, including a middle hole and side holes located on two sides of the middle hole, are disposed in a magnetic island of a rotor, the middle hole and the side holes satisfying specific conditions respectively, thereby achieving an optimal cogging reduction efficacy.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: February 19, 2019
    Assignee: HIWIN MIKROSYSTEMS CORP.
    Inventors: Jhen Nan Kuo, Li-Wei Zheng, Ming Hung Hsieh
  • Patent number: 9948152
    Abstract: A motor for a laundry appliance includes a drive shaft coupled to a drum at a first end. The rotor frame is coupled proximate the second end of the drive shaft, where the rotor frame includes at least one polymeric material. A central hub includes a core and a perimetrical ring that extends circumferentially around the core. A plurality of recesses are defined within a planar surface of the perimetrical ring, wherein a portion of the polymeric material is received within the plurality of recesses to secure the rotor frame to the central hub.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: April 17, 2018
    Assignee: Whirlpool Corporation
    Inventors: Krati Bhargava, Fang Deng, James Hull, Hideraldo V. Santos, Orlando Starke, Pingjian Xu, Weitao Yang
  • Patent number: 9407115
    Abstract: A permanent magnet motor, generator or the like that uses ceramic magnets in the rotor to concentrate the magnetic flux in the airgap. Magnet poles are formed by pole plates with tabs forming north and south poles with magnetic separators therebetween. Magnet sections are stacked axially. Connection to the shaft is made by means of a collet or other attachment method.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: August 2, 2016
    Assignee: LCDRIVES CORP.
    Inventors: Russel Hugh Marvin, Nigel Shepherd
  • Patent number: 9240709
    Abstract: A manufacturing method for an electric motor rotor includes: a stacking process in which a plurality of iron core pieces are stacked to form a laminated iron core; a magnet insertion process in which a permanent magnet is inserted into a magnet insertion hole provided in the laminated iron core; a resin filling process in which the laminated iron core is heated to fill the magnet insertion hole with a molten resin for magnet fixation; and a rotary shaft assembly process in which a rotary shaft is warm-fitted into a rotary shaft insertion hole of the laminated iron core utilizing residual heat from the heating of the laminated iron core 10 in the resin filling process.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: January 19, 2016
    Assignee: AISIN AW CO., LTD.
    Inventors: Susumu Kato, Shigeru Maeda, Takeshi Yokoyama, Takuya Ooura, Motoki Koori
  • Patent number: 9024495
    Abstract: A rotor for an electric motor that includes a main body on which a support surface is formed, to which a permanent magnet element is attached. The main body is partially surrounded by a joining sleeve having chamber walls. The chamber walls together with the support surfaces form a chamber in which the permanent magnet element is arranged. The joining sleeve fixes the position of the permanent magnet element in a radial direction on the main body and a locking element is molded onto the main body. The locking element closes the chamber fixing the position of the permanent magnet element in the axial direction on the main body.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: May 5, 2015
    Assignee: Continental Automotive GmbH
    Inventors: Rüdiger Brandau, Kurt Siebald
  • Patent number: 9013083
    Abstract: Provided is a permanent magnet type motor including: a rotor including a rotor core and a plurality of permanent magnets; a conducting circuit including a first electric conductor extending in an axial direction of the rotor and being disposed between permanent magnets in a circumferential direction of the rotor and a second electric conductor for connecting the first electric conductors electrically; and a stator disposed so as to be opposed to the rotor, including a stator core and an armature winding. A rotation angle is detected by measuring current flowing in the armature winding. The stator core is formed to have a shape in which, a slot pitch is defined by ?s=(2×?×Rs)/Ns, where an inner radius of the stator is represented by Rs and a number of slots is represented by Ns, a value Wsn obtained by dividing a slot opening width Ws by the slot pitch ?s satisfies “0.08?Wsn”.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: April 21, 2015
    Assignee: Mitsubishi Electic Corporation
    Inventors: Yusuke Morita, Masatsugu Nakano, Sachiko Kawasaki
  • Patent number: 9003639
    Abstract: A rotor includes a rotor core fixedly attached to a rotational shaft and having a plurality of hole portions arranged in the circumferential direction, a magnet inserted into a plurality of hole portions each, and a filling portion injected into the hole portion. The filling portion is injected into the hole portion from a gate facing a central part in the width direction of the magnet in the opening of the hole portion.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: April 14, 2015
    Assignees: Toyota Jidosha Kabushiki Kaisha, Mitsui High-Tec, Inc.
    Inventors: Kentaro Haruno, Taketo Takeuchi, Atsushi Watanabe, Kenichiro Fukumaru, Katsumi Amano, Kazutoshi Ueda, Takashi Fukumoto
  • Publication number: 20150022042
    Abstract: A motor having an improved structure to enhance durability. The motor includes a stator including stator cores and coils wound on the stator cores, a rotor disposed at the inside of the stator and rotated by electromagnetic interaction with the stator, and a motor shaft combined with the rotor so as to be rotated together with the rotor. The rotor includes a plurality of rotor cores arranged to be separated from each other in the circumferential direction of the rotor, a plurality of rotor slots formed between the plurality of rotor cores, a plurality of permanent magnets inserted into the plurality of rotor slots, molding members filling the plurality of rotor slots so as to cover the outer ends of the plurality of permanent magnets, and a plurality of reception holes provided on the plurality of rotor cores so as to be filled with the molding members.
    Type: Application
    Filed: July 15, 2014
    Publication date: January 22, 2015
    Inventors: Jin Woo HAN, Deok Jin KIM, Young Kwan KIM, Byung Ryel IN
  • Patent number: 8922083
    Abstract: A laminated core of a rotor includes an inner core portion and a plurality of outer core portions. The inner core portion axially extends in a cylindrical shape in a region located more radially inward than magnets. The outer core portions are arranged in a circumferential direction in a region located more radially outward than the inner core portion. The plurality of outer core portions and a plurality of the magnets are alternately arranged in the circumferential direction. Accordingly, magnetic flux generated from a pair of magnetic pole surfaces of the plurality of magnets can be effectively used. In addition, the laminated core includes caulking portions in each of the inner core portion and the plurality of outer core portions. Accordingly, a plurality of thin plate cores are firmly fixed.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: December 30, 2014
    Assignee: Nidec Corporation
    Inventors: Kyohei Asahi, Kenichiro Hamagishi, Kuniaki Tanaka, Susumu Terada
  • 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: 8853908
    Abstract: A magnet rotor assembly comprises a magnet sleeve held on a rotor shaft by a rigid adhesive layer that includes at least one axial wedge shape corresponding to an axial irregularity on at least one of the surfaces bonded by the adhesive layer. Improved crush strength in the magnet sleeve and in other bonded metal parts, both initially and after exposure to high temperatures is accomplished by impregnating the parts with a curable resin.
    Type: Grant
    Filed: February 27, 2011
    Date of Patent: October 7, 2014
    Assignee: MBS Engineering, LLC
    Inventors: Stanley Byron Musselman, Edward E Welker, Mitchell L Spencer, Viswanathan Panchanathan
  • Patent number: 8829753
    Abstract: A motor includes: a rotor comprising: a rotary shaft; a magnetic body rotatable together with the rotary shaft; and first and second permanent magnets fixed on an outer circumference or an inner circumference of the magnetic body, and a stator comprising: an iron core arranged around the rotor; and a coil for exciting the iron core.
    Type: Grant
    Filed: January 13, 2012
    Date of Patent: September 9, 2014
    Assignee: Shinano Kenshi Co., Ltd.
    Inventor: Nobuchika Maruyama
  • Patent number: 8729760
    Abstract: In accordance with the present invention, a rotor of an electric motor including a rotor core, a plurality of magnets spaced apart from each other on an outer circumferential surface of the rotor core, and a cylindrical protective pipe surrounding the magnets is provided. The protective pipe has an inner diameter smaller than a diameter of a circumscribed circle passing through tops of outer surfaces of the magnets. A space defined by an inner surface of the protective pipe, the outer surfaces of the magnets and the outer surface of the rotor core is filled with resin, and the protective pipe is held so as to have a diameter larger than that of the circumscribed circle, due to injection pressure of the resin.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: May 20, 2014
    Assignee: FANUC Corporation
    Inventors: Kouji Kobayashi, Takeshi Tamaki
  • Patent number: 8659199
    Abstract: A stator and a rotor are oppositely arranged having a gap between the stator and the rotor in a direction parallel to a rotary shaft. The rotor has permanent magnets forming field magnetic poles and soft magnetic material segments to cover at least stator-facing surfaces of the respective permanent magnets. Each of the soft magnetic materials forms a composite part together with the permanent magnet. The rotor further has a disc-shaped nonmagnetic molded frame molded so as to cover the periphery of the composite part including the permanent magnet and the soft magnetic material segment while leaving a stator-facing surface of the soft magnetic material segment as an exposed surface. The composite part (including the permanent magnet and the soft magnetic material) and the nonmagnetic molded frame are integrated by molding of the molded material.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: February 25, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Hirooki Tokoi, Yuji Enomoto
  • Patent number: 8629595
    Abstract: A permanent magnet rotor arrangement is provided. The arrangement includes a rotor, a plurality of nonmagnetic profiled tubes defining a closed channel and affixed circumferentially along the outer rim of the rotor, and a plurality of permanent magnet pole pieces arranged in the channels. In a preferred embodiment, the tubes are monolithic and one pole piece is arranged in every channel.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: January 14, 2014
    Assignee: Siemens Aktiengesellschaft
    Inventor: Henrik Stiesdal
  • Patent number: 8598760
    Abstract: A permanent magnet module for a rotor of a permanent magnet electrical machine is presented. The permanent magnet module comprises: a stack of ferromagnetic steel sheets (104) having a groove in the direction perpendicular to the ferromagnetic steel sheets, and a permanent magnet (105) located in the groove and arranged to produce magnetic flux that penetrates a surface (106) of the stack of ferromagnetic steel sheets. The surface has a shape suitable for forming a desired magnetic flux density distribution into an air-gap of the permanent magnet electrical machine. The permanent magnet module further comprises a base-plate (102) made of solid ferromagnetic steel. The base plate is located at an opening (116) of the groove and constitutes together with the groove an aperture in which the permanent magnet is located.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: December 3, 2013
    Assignee: The Switch Drive Systems Oy
    Inventor: Panu Kurronen
  • Patent number: 8578592
    Abstract: A method of manufacturing a laminated rotor core, includes a first process of placing segment dummy plates between an iron core and a die, each of each segment dummy plates covering one or more of plural magnet insertion portions and including a resin injection hole communicating to the one or more of the magnet insertion portions; a second process of injecting a resin from resin reservoir parts formed in any one of an upper die and a lower die holding the iron core through the resin injection hole of each segment dummy plate to the corresponding one or more of the magnet insertion portions; and a third process of detaching the segment dummy plates together with excess resin after the resin injected to the one or more of the magnet insertion portions is cured.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: November 12, 2013
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Akira Nagai, Mei Arazoe, Go Kato
  • 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: 8339010
    Abstract: An electric motor (10) is constructed with an inner circumference side rotor (11) and an outer circumference side rotor (12) which are coaxially arranged; and planetary gear mechanism which rotates at least one of the inner circumference side rotor (11) and the outer circumference side rotor (12) around an rotary shaft O. Long sides of substantially plate-like inner circumference side permanent magnets (11a) of the inner circumference side rotor (11) and those of substantially plate-like outer circumference side permanent magnets (12a) of the outer circumference side rotor (12) are arranged so as to face each other by the rotation of at least one of the inner circumference side rotor (11) and the outer circumference side rotor (12) in a cross section perpendicular to the rotary shaft O with the planetary gear mechanism.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: December 25, 2012
    Assignee: Honda Motor Co., Ltd
    Inventors: Hirofumi Atarashi, Shoei Abe, Tamotsu Kawamura, Hiromitsu Sato
  • Publication number: 20120235531
    Abstract: A compressor includes a housing, a compression mechanism and an electric motor driving the compression mechanism. The electric motor includes a stator fixed to the housing, a rotary shaft rotatably supported by the housing, a rotor that is fixed on the rotary shaft and has a rotor core made of a plurality of laminated steel sheets, a magnet insertion hole formed through the rotor core, a permanent magnet loosely fitted in the magnet insertion hole, a first clearance formed between inner surface of the magnet insertion hole and outer surface of the permanent magnet, a second clearance formed between end surface of the rotor core and surface of the permanent magnet in the axial direction of the rotor core and resin filled in the first clearance and the second clearance so as to surround entire surface of the permanent magnet.
    Type: Application
    Filed: March 14, 2012
    Publication date: September 20, 2012
    Applicant: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventors: Hiroshi Fukasaku, Minoru Mera
  • Patent number: 8222787
    Abstract: An interior permanent magnet electric machine is disclosed. The interior permanent magnet electric machine comprises a rotor comprising a plurality of radially placed magnets each having a proximal end and a distal end, wherein each magnet comprises a plurality of magnetic segments and at least one magnetic segment towards the distal end comprises a high resistivity magnetic material.
    Type: Grant
    Filed: April 1, 2009
    Date of Patent: July 17, 2012
    Assignee: General Electric Company
    Inventors: Ayman Mohamed Fawzi El-Refaie, Patel Bhageerath Reddy
  • 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: 8138649
    Abstract: Disclosed is a rotor assembly for an electric machine includes a rotor core. The rotor core has at least one magnet slot with an increasing slot width as radial distance from a rotor shaft increases, and at least one slot lip extending at least partially across the slot width. The rotor assembly also includes at least one permanent magnet located in at least one magnet slot, the magnet having an increasing magnet width as radial distance from a rotor shaft increases. The rotor assembly further includes a retainer disposed in the magnet slot radially between the magnet and the at least one slot lip. Also disclosed is a method of securing at least one permanent magnet in a rotor assembly of an electric machine.
    Type: Grant
    Filed: August 2, 2007
    Date of Patent: March 20, 2012
    Assignee: Remy Technologies, L.L.C.
    Inventor: Michael D. Bradfield
  • 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: 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: 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
  • Patent number: 7847461
    Abstract: A permanent magnet machine includes a stator having a hollow core, a rotor rotatably disposed inside the hollow core, and a plurality of multilayered permanent magnets embedded in the rotor. Each multilayered permanent magnet has opposite first and second ends, and includes a first magnet disposed at the first end, and a second magnet disposed at the second end and coupled to the first magnet. The second magnet has higher magnet strength than the first magnet, and also has lower high-temperature stability than the first magnet.
    Type: Grant
    Filed: June 6, 2007
    Date of Patent: December 7, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Khwaja M. Rahman, Edward L. Kaiser, Matthew D. Laba
  • Publication number: 20100272591
    Abstract: A rotor (2) provided for a canned motor of a wet-running centrifugal pump forms the shaft for the drive of the impeller (7) and includes at least one permanent magnet (12) which is encapsulated in a fluid-tight manner. The peripheral part of the encapsulation in the region of the at least one permanent magnet (12) forms the rotor shaft.
    Type: Application
    Filed: December 3, 2008
    Publication date: October 28, 2010
    Applicant: GRUNDFOS MANAGEMENT A/S
    Inventors: Oluf Kjaer, Finn Mathiesen Hoj, Helge Grann, Kare Iversen
  • Publication number: 20100237734
    Abstract: A method for mounting permanent magnets that form magnetic poles on a permanent magnet support surface of the rotor of an electric machine includes the steps of forming a mold by the placement of a mold part against the support surface in such a way that the mold cavity of the mold is bounded on one side by the support surface inserting a permanent magnet into the mold so that the inserted permanent magnet is held in the mold in a desired position with respect to the support surface, and filling the mold with a thermosetting adhesive in such that the adhesive bonds the permanent magnet with the support surface and completely fills any spaces formed between the permanent magnet and the wall of the mold cavity.
    Type: Application
    Filed: March 21, 2009
    Publication date: September 23, 2010
    Inventors: Jurgen Rinck, Axel Herrmann
  • Patent number: 7772733
    Abstract: An electrical generator includes a rotary disk that is made of plastic injection molding in which a plurality of coils each having an exposed contact is embedded. Two stationary disks are arranged on opposite sides of the rotary disk and each has an inside surface that opposes the rotary disk and carries two semi-circular magnets. The rotary disk is fixed to a shaft having opposite ends fit into bearings that are received in central bores defined in the stationary disks. The coils are each formed by winding a wire in at least one turn in the form of a circle or an ellipse, the turns being coincident with each other or partially offset with respect to each other. Or alternatively, the coils are formed concentric with respect to each other and the rotary disk.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: August 10, 2010
    Inventor: Chuan-Sheng Chen
  • 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
  • Patent number: 7612478
    Abstract: A method for obtaining, in a quick way, a strong, compact and waterproof permanent-magnet rotor (3), intended for a synchronous motor (1), particularly for pumps of washing machines for industrial and domestic use and the like, of the external stator (2) type, comprising a cylindrical hollow core (6) surrounded by a plurality of permanent magnets (10) comprising the steps of arranging a cup-like body (7) with a base end (8a), a free end (8b) and a side wall (9) exhibiting a plurality of passing longitudinal recesses (12) which define, between the same, a plurality of positioning seats (13) for the magnets (10), providing to insert the core (6) into the cup-like body (7) and arrange the magnets (10) in said seats (13) and injecting a plastic material with obtainment of a cage-like structure (50) having opposite bottoms (27, 28) abutting at the ends (8a, 8b) of the cup-like body (7) as well as columns (29) extended between the opposite bottoms (27, 28) housed in the recesses (12).
    Type: Grant
    Filed: November 15, 2006
    Date of Patent: November 3, 2009
    Assignee: Askoll Holding S.r.l.
    Inventor: Elio Marioni
  • Publication number: 20090267436
    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: Application
    Filed: April 29, 2009
    Publication date: October 29, 2009
    Inventor: Henrik Stiesdal
  • Publication number: 20090033167
    Abstract: Disclosed is a rotor assembly for an electric machine includes a rotor core. The rotor core has at least one magnet slot with an increasing slot width as radial distance from a rotor shaft increases, and at least one slot lip extending at least partially across the slot width. The rotor assembly also includes at least one permanent magnet located in at least one magnet slot, the magnet having an increasing magnet width as radial distance from a rotor shaft increases. The rotor assembly further includes a retainer disposed in the magnet slot radially between the magnet and the at least one slot lip. Also disclosed is a method of securing at least one permanent magnet in a rotor assembly of an electric machine.
    Type: Application
    Filed: August 2, 2007
    Publication date: February 5, 2009
    Applicant: REMY INTERNATIONAL, INC.
    Inventor: Michael D. Bradfield
  • Publication number: 20070210663
    Abstract: The invention proposes an electric motor having a rotor, a rotor and a process for manufacturing a rotor for an electric motor, in which the manufacturing complexity is considerably reduced in comparison with the prior art. This object is achieved by virtue of the fact that, in the rotor, a plastics connection (11, 12) is provided between the return plate (2) and the rotor shaft (1). This plastics connection (11, 12) between the return plate (2) and the rotor shaft (1) is produced in accordance with the manufacturing process according to the invention by injection-molding.
    Type: Application
    Filed: March 29, 2007
    Publication date: September 13, 2007
    Inventors: Michal Kalavsky, Kurt Wallerstorfer, Gerhard Oswald
  • Patent number: 7030530
    Abstract: A permanent magnet element intended especially for electrotechnical devices and an electric machine, the element (1) comprising at least one permanent magnet piece (10). The permanent magnet element (1) also comprises a protective cover (11) that is arranged to partly surround the permanent magnet pieces (10) arranged in the element, and the permanent magnet element (1) also comprises one or more fastening elements (13; 21).
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: April 18, 2006
    Assignee: ABB Oy
    Inventor: Jukka Malmberg
  • Patent number: 6897590
    Abstract: Rotor assembly for an electrical machine, including a body of generally cylindrical shape having an inner opening, wherein slots are provided in the body, the slots extending from the inner opening towards the outer periphery of the body; permanent magnets disposed in said slots; wherein at least one of the slots comprises an end section near the outer periphery of the body having an area of enlarged width.
    Type: Grant
    Filed: August 6, 2003
    Date of Patent: May 24, 2005
    Assignee: Minebea Co., Ltd.
    Inventor: Vladimir Vladimirovich Popov
  • Patent number: 6891297
    Abstract: An electrical-steel-sheet formed body is provided with an opening portion into which a permanent magnet is inserted, and an outer-peripheral hardened portion formed on the electrical-steel-sheet formed body at an outer periphery side thereof for the opening portion and having a higher hardness than a remaining area of the electrical-steel-sheet formed body. The electrical-steel-sheet formed body can be used as the rotor of the built-in permanent magnet type rotary electric machine, and the built-in permanent magnet type rotary electric machine can be obtained.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: May 10, 2005
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Munekatsu Shimada, Hideaki Ono, Tetsurou Tayu, Makoto Kano, Yu Owada, Naoshi Sakata, Mitsuo Uchiyama, Toshimitsu Matsuoka, Kimihiro Shibata, Shinichiro Kitada
  • Patent number: 6822359
    Abstract: The rotor has a core with an internal space. Permanent magnets are arranged on the core. These permanent magnets are surrounded by an outer cylinder, which is connected flush to closure disks which bear stub shafts. Channels run out from the internal space in the radial direction to the region of the permanent magnets. A resin mass is first introduced in the internal space. The rotor is thereafter heated and run up to centrifuging rotational speed. As a result, the molten resin mass flows through the channels to the region of the permanent magnets and fills up all the cavities present there and also cracks which form in the brittle permanent magnets on running up to speed. The resin mass hardens while the rotor is kept at centrifuging rotational speed. Each surface region of the permanent magnets is thus reliably protected against corrosion.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: November 23, 2004
    Assignee: Alstom Technology LTD
    Inventor: Reinhard Joho
  • Publication number: 20040145263
    Abstract: For the purpose of preventing demagnetization of a magnet (32) without any cost increase and improving the max torque and the efficiency of an electric motor (20) by suppressing deterioration of magnetic flux density, a permanent magnet-type electric motor (20) comprises a stator (21) and a rotor (25) disposed in the stator (21), in which a plurality of permanent magnets (32), (32) forming a magnetic pole are inserted in magnet insertion portions (31), (31) of a yoke (26) in such manner that the magnets (32), (32) form in line in the circumferential direction thereof, wherein each magnet (32) is divided into a central magnet (33) that is positioned at the central portion in the width direction of the magnet insertion portion (31) and end magnets (34), (34) that are positioned at end portions of the magnet insertion portion (31), and the end magnets (34), (34) have greater coercive forces than the central magnet (33), whereas the central magnet (33) has a greater magnetic flux density than the end magnets (34)
    Type: Application
    Filed: November 19, 2003
    Publication date: July 29, 2004
    Inventors: Hiroaki Kojima, Jun Kageyama, Akio Yamagiwa
  • Publication number: 20040140725
    Abstract: A plurality of embodiments of rotating electrical machines having improved arrangements for securing plate type permanent magnets to a cylindrical surface of one component of the machine in facing relation to another relatively rotatable component thereof with a small gap therebetween. The magnets are secured by embedding them in a bonding material surrounding the peripheral edges of the magnets and at least a portion of the sides thereof facing the gap and leaving an area of said sides directly exposed to the gap to maintain good electrical properties and machine performance without necessitating an increase in the gap.
    Type: Application
    Filed: January 5, 2004
    Publication date: July 22, 2004
    Applicant: KABUSHIKI KAISHA MORIC
    Inventor: Hideaki Takahashi
  • Patent number: 6759775
    Abstract: A permanent magnet motor comprises a frame and a plurality of energizable coils mounted on the frame and are substantially equally spaced from one another. A starting coil is mounted on the frame. A wheel is rotatably mounted on the frame. Carried on the wheel are a plurality of permanent magnets, which are substantially equally spaced form one another. The axes of the energizable coils are disposed substantially at right angles to the axes of the permanent magnets. The permanent magnets cooperate with the energizable coils, so that upon energization of the starting coil, the wheel will begin to rotate in a first direction and upon energization of the energizable coils the wheel will continue to rotate in said first direction. The energizable coils are generally cylindrical and the outer surface of each permanent magnet has a recess complementary to the outer surface of the energizable coil so that the permanent magnet and pass closely to the energizable coil during rotation of the wheel.
    Type: Grant
    Filed: February 13, 2002
    Date of Patent: July 6, 2004
    Assignee: Abacat, Inc.
    Inventor: Jeremiah L. Grimm
  • Patent number: 6711805
    Abstract: The rotor has a core with an internal space. Permanent magnets are arranged on the core. These permanent magnets are surrounded by an outer cylinder, which is connected flush to closure disks which bear stub shafts. Channels run out from the internal space in the radial direction to the region of the permanent magnets. A resin mass is first introduced into the internal space. The rotor is thereafter heated and run up to centrifuging rotational speed. As a result, the molten resin mass flows through the channels to the region of the permanent magnets and fills up all the cavities present there and also cracks which form in the brittle permanent magnets on running up to speed. The resin mass hardens while the rotor is kept at centrifuging rotational speed. Each surface region of the permanent magnets is thus reliably protected against corrosion.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: March 30, 2004
    Assignee: Alstom Technology Ltd
    Inventor: Reinhard Joho
  • Patent number: 6677692
    Abstract: A rotor (10) for a miniature electric motor includes a magnet (12) having a rotation axis (14) and a shaft (16) fixed concentrically to the magnet. The magnet (12) includes a through hole (20) extending coaxially with the rotation axis (14). The shaft (16) includes a portion (24) fitted in the through hole (20). The portion (24) has an axial interengagement length (t1) shorter than an axial length (T1) of the through hole (20). The rotor (10) also includes reinforcing means provided at least inside the through hole (20). The magnet (12) comprises an annular magnet material (18), and a coating (22) formed on a surface of the magnet material and arranged at least inside the through hole (20). The reinforcing means is formed as the coating (22) of the magnet (12), and acts to ensure a fixing force to securely hold the shaft (16) in a predetermined position on the magnet.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: January 13, 2004
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Junji Sato, Eikichi Sashida, Hideharu Miyauchi, Yousuke Sakakibara, Hiroshi Ikeda, Eigo Hashimoto
  • Publication number: 20030168925
    Abstract: A permanent magnet rotor, intended for an electric motor, comprises a permanent magnet ring, which is held by a plastic support element and a sliding bearing. The permanent magnet ring comprises a compressed plastic-bonded rare earth magnet. The sliding bearing is made of a sintered material. The plastic support element can be produced in an injection mold. The permanent magnet ring includes a cylindrical receptacle for the sliding bearing and is made as one piece with a pinion. The plastic support element envelops the permanent magnet ring at least partially in the axial and radial direction and the permanent magnet ring can be injected simultaneously as an insert in the injection mold.
    Type: Application
    Filed: October 25, 2002
    Publication date: September 11, 2003
    Inventors: Georg Bernreuther, Anton Stadler
  • Patent number: 6509664
    Abstract: A hybrid synchronous machine includes a cylindrical element having slots; excitation windings situated in at least some of the slots; and permanent magnets situated in at least some of the slots, the permanent magnets comprising radially magnetized permanent magnets.
    Type: Grant
    Filed: January 13, 2000
    Date of Patent: January 21, 2003
    Assignee: General Electric Company
    Inventors: Manoj Ramprasad Shah, Gerald Burt Kliman
  • Patent number: 6441522
    Abstract: A pole for use in a magnetic circuit includes a flux-passing portion for passing magnetic flux and a cap. The flux-passing portion has a face through which at least some of the magnetic flux passes and to which the cap is fixed. The cap is made of a permeable material and is formed to impede eddy currents in the cap. The cap may have a top and bottom surface joined by a shoulder to provide a distribution of magnetic flux through the shoulder that is less concentrated than the flux distribution through a 90-degree corner. The pole may be incorporated into a generator, a motor, a linear motor, or a portable engine-driven generator to increase the efficiency thereof.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: August 27, 2002
    Assignee: Coleman Powermate, Inc.
    Inventor: Harold C. Scott
  • Patent number: 6437473
    Abstract: A method of producing the core of an electric motor by providing a stack of laminations of magnetic material. Windows are formed in the laminations for one or more magnetic elements to be placed in each window. Each window has an end edge portion (17) which is to be at the peripheral edge (18) of the lamination of the finished version of the rotor. The laminations originally have an annular radial extension (60-61) and after the core is assembled with end caps, the annular radial extension (60-61) is removed so that the window end edge portions (17) are at the periphery (18) of the laminations. There is a polar peripheral portion (20) between each window and the periphery (18) of the lamination and an intermediate peripheral portion (40) between two adjacent polar peripheral portions, with such intermediate polar portions having reduced electrical conductibility and reduced magnetic permeability.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: August 20, 2002
    Assignee: Empresa Brasileira de Compressores S.A. - Embraco
    Inventors: Marcos Romeu Möbius, Luiz Von Dokonal, Claudio Werner De Lima
  • Publication number: 20020084710
    Abstract: Difficulties in self-starting a permanent magnet motor are eliminated in a structure including a stator with a rotor journalled within the stator for rotation about an axis. The rotor includes a body of ferromagnetic material having a nominally cylindrical peripheral surface concentric with the axis. Permanent magnets are located on the peripheral surface to define equally angularly spaced magnetic poles with alternating ones of the poles being of opposite polarity. A thin, hollow cylinder formed of a good electrically conducting material is disposed on the body to sandwich the magnets against the peripheral surface of the body and provides a situs for the generation of localized induced electrical current which generates magnetic fields that react with rotating magnetic fields in the stator to start the motor from a dead stop without the need for position sensors or controlled electronics.
    Type: Application
    Filed: December 28, 2000
    Publication date: July 4, 2002
    Inventors: Andrew Worley, Kevin Black, Simon Paul Purbrook