Laminated Core Patents (Class 310/216.004)
  • Patent number: 10594179
    Abstract: The rotor includes ribs and permanent magnets mounted as spokes in pole pairs. A second wall of each rotor air gap of a plurality of rotor air gaps is parallel to an edge of a permanent magnet of the permanent magnets. A length of the second wall is less than 80% of a length of the edge. A fifth wall of each rotor air gap of the rotor air gaps is formed by a first side of a rib. Each pair of permanent magnets has an associated pair of rotor air gaps of the rotor air gaps. A first rotor air gap of each pair of rotor air gaps of the rotor air gaps is a mirror image of a second rotor air gap of each pair of rotor air gaps. Each pair of rotor air gaps is separated by an associated rib of the plurality of ribs.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: March 17, 2020
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Wenbo Liu, Thomas A. Lipo
  • Patent number: 10320253
    Abstract: An armature coil includes a first portion, a second winding portion, a first winding end, a second winding end, and a crossover portion, and is continuously wound. The first winding portion is concentratedly wound in a counterclockwise winding direction with respect to a direction obtained in viewing a second end portion from a first end portion of a tooth, as it passes from the first winding end to the crossover portion. The second winding portion is concentratedly wound in a clockwise winding direction with respect to a direction obtained in viewing a second end portion from a first end portion of the tooth, as it passes from the crossover portion to the second winding end.
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: June 11, 2019
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Shin Nakamasu, Hiroki Fujita, Hirokazu Fujii, Ryou Fukui, Kouji Inoue, Junichi Satou
  • Patent number: 10236740
    Abstract: A stator of a motor comprises a terminal. The terminal includes: a leg portion, a hook portion including an open end and disposed on a core outer circumference part at a position corresponding to one of core tooth parts in a circumferential direction, and a coupling portion extending from the leg portion in the circumferential direction along the core outer circumference part and connected to the hook portion. An end portion of a coil is connected to the hook portion. The coupling portion of the terminal is bent to locate the hook portion radially outside the core tooth parts.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: March 19, 2019
    Assignee: MINEBEA MITSUMI INC.
    Inventor: Shuhei Kimpara
  • Patent number: 10135316
    Abstract: A stator assembly that provides a concentric housing and stator, the stator radially positioned inside the housing, the housing having an inner surface, the stator having an outer surface radially facing the inner surface. One of the outer surface of the stator and the inner surface of the housing has recessed shapes and the other one of the outer and inner surface has protruding shapes. When the two shapes are arranged in a first relative position, the protruding shapes are inserted in the recessed shapes so that the stator can be mounted radially inside the housing along a central axis of the assembly, and in a second relative position that is angularly shifted relative to the first position around the central axis, the protruding shapes exert, against the one of the housing and the stator that bears the recessed shapes, a radial force that angularly and axially locks the stator.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: November 20, 2018
    Assignee: SKF MAGNETIC MECHATRONICS
    Inventors: Eduardo Carrasco, Eddy Herisse
  • Patent number: 10109417
    Abstract: There is provided a laminated iron core including a plurality of piled iron core pieces, each piled iron core pieces being blanked from at least two piled sheet materials and sequentially laminated on other piled iron core pieces, wherein the piled iron core pieces adjacent in a direction of lamination are interlocked together by a plurality of caulking parts provided in each piled iron core pieces. Each of the plurality of caulking parts includes a caulking protrusion formed in one side and a caulking fitting groove formed in the other side to which the caulking protrusion is fitted, and the caulking protrusion is allowed to protrude to the caulking fitting groove of the piled iron core pieces adjacent thereto in the direction of lamination, and a width of the caulking protrusion is larger than an inner width of the caulking fitting groove.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: October 23, 2018
    Assignee: MITSUI HIGH-TEC, INC.
    Inventor: Izumi Nakamura
  • Patent number: 9948161
    Abstract: A rotor assembly for an electric machine includes a rotor having an axis of rotation extending in an axial direction of the rotor and at least one first hole extending parallel to the axis of rotation and radially spaced from the axis of rotation by a first radial distance, and at least one first balancing element for compensating an unbalance of the rotor in rotation about the axis of rotation. The at least one first balancing element can be provided in the at least one first hole and can be fastened in the at least one first hole by means of a press fitting connection between the at least one first hole and the at least one first balancing element. Thus, a simple and economical possibility of balancing the rotor is provided.
    Type: Grant
    Filed: October 14, 2013
    Date of Patent: April 17, 2018
    Assignee: CONTINENTAL AUTOMOTIVE GMBH
    Inventor: Matti Radwainski
  • Patent number: 9837867
    Abstract: A rotor for connection to a rotating member for use in an electric machine is provided. The rotor includes a first member connected to the rotating member and generally positioned perpendicularly thereto and a second member connected to one of the rotating member and the first member.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: December 5, 2017
    Assignee: Regal Beloit America, Inc.
    Inventors: Subhash Marutirao Brahmavar, Greg Heins, Charles Richard Langford
  • Patent number: 9748815
    Abstract: A rotary compressor includes a casing, an electric motor, a compression mechanism and a balance weight mechanism. The electric motor includes a stator fixed to the casing, and a rotor. The compression mechanism is connected to the electric motor via a drive shaft. The balance weight mechanism is configured to cause centrifugal force to act on the drive shaft. The rotor includes a rotor core including a plurality of stacked electromagnetic steel sheets, and a rivet configured to clamp the rotor core at axial ends of the rotor core. The balance weight mechanism includes an insertion portion into which drive shaft is press fit, and a flat portion forming a flat surface at an axial end of the drive shaft. The balance weight mechanism is disposed at an axial end portion of the rotor to cover a head of the rivet.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: August 29, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Kouichi Tanaka, Kazutaka Hori, Takashi Shimizu
  • Patent number: 9729035
    Abstract: A rotor of an electric machine is disclosed that resists expansion of the rotor components even at high rotational speed. The rotor includes first and second pluralities of laminations having slots to accept rotor bars. A support disk, also having slots, is placed between the laminations. The support disk, into which the rotor bars are slid, restrains the rotor bars from bending outwardly at high rotational speeds of the rotor. The rotor bars are further restrained at the ends by end rings, which have apertures into which ends of the rotor bars are placed. In some embodiments, containment rings are placed over axial extension of the end rings to prevent outward bowing at high speeds. In some embodiments, the rotor includes a stiffener sleeve to provide additional resistance to expansion during high rotational speeds.
    Type: Grant
    Filed: April 14, 2015
    Date of Patent: August 8, 2017
    Assignee: EcoMotors, Inc.
    Inventors: Will Robert Nielsen Hippen, Franz J. Laimboeck, Peter P. Hofbauer, Tyler R. Garrard
  • Patent number: 9692263
    Abstract: When a plurality of core plates are stacked and fixed to form a stator core for a rotary electric machine, fixation portions are set in accordance with the relative positional relationship with magnetic poles of a rotor to suppress torque fluctuations. The number of rotational buildup states which is a value obtained by dividing 360 degrees by a rotational buildup angle ?s by which the core plates are rotated in units of a predetermined number of plates to be stacked, the number of magnetic poles which is the number of magnetic poles M of the rotor, and the number of fixation portions which is the number of fixation portions 5 are set such that the number of fixation portions is an integer number of times the number of rotational buildup states and at least common divisors of the number of fixation portions and the number of magnetic poles include “1” only or “1” or “2” only.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: June 27, 2017
    Assignee: AISIN AW CO., LTD.
    Inventor: Yasuo Yamaguchi
  • Patent number: 9621008
    Abstract: A power generator has a power generation unit for generating electric power, a rotary unit and a power transmission unit. The power generation unit includes a stator having a stator core and a rotor disposed in the stator. The rotor has a rotor shaft and a driven gear disposed on the rotor shaft and is configured to be driven to rotate the rotor shaft. The rotary unit has a driving gear for undergoing rotational movement to rotate the rotor shaft via the driven gear to generate electric power. The power transmission unit has an intermediate gear for transmitting a rotational force of the driving gear of the rotary unit to the driven gear of the rotor shaft. The intermediate gear has at least one rotary shaft disposed inside of the stator core.
    Type: Grant
    Filed: February 17, 2012
    Date of Patent: April 11, 2017
    Assignee: SEIKO INSTRUMENTS INC.
    Inventors: Makoto Suzuki, Fumiharu Iwasaki, Jun Shinohara, Shinji Kinoshia, Toru Ozaki, Norimasa Yanase
  • Patent number: 9548633
    Abstract: Provided is a stator of a motor which is capable of reducing an iron loss generated in a motor and thereby attaining a high-efficient motor. A stator of a motor comprises a yoke of a tubular shape; and teeth each of which includes an extending portion extending inward in a radial direction of the yoke from the yoke and an increased-width portion formed at a tip end of the extending portion so as to have a greater width than the extending portion in a circumferential direction of the yoke; wherein the extending portion has a narrower portion having a smaller width than a remaining portion of the extending portion.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: January 17, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takashi Ogawa, Yuichi Yoshikawa, Ikuo Ozaki, Toshiyuki Tamamura, Hirokazu Yamauchi
  • Patent number: 9502948
    Abstract: A method for producing stator pole teeth includes: arranging stator pole teeth to be wound in the form of a row, each of the stator pole teeth having at least one insulation body; winding one pole tooth or several pole teeth of the row of stator pole teeth; routing winding wire or winding wires out of a winding space in the pole teeth to the outside of the stator pole teeth into a laying space bounded on one side by insulation bodies of the pole teeth; and laying the winding wire or the winding wires in the laying space to connect individual pole teeth to one another. During laying of the winding wire or wires, the laying space is temporarily constricted such that the winding wires are forcibly automatically axially stacked in the laying space so as to avoid wire crossovers.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: November 22, 2016
    Assignee: Continental Automotive GmbH
    Inventor: Uwe Schein
  • Patent number: 9473001
    Abstract: A cooling structure for a brushless motor, which includes a stator, a rotor, and a motor shaft arranged integrally with the rotor. The stator includes a stator core including an inner circumferential surface, a cylindrical portion including first and second end surfaces adjacent to the inner circumferential surface, and teeth projecting from the inner circumferential surface. An insulator covers the inner circumferential surface, the first and second end surfaces, and the teeth. A coil is wound around each tooth that is covered by the insulator. The cooling structure includes a cooling fan coupled to one end of the motor shaft and arranged closer to the second end surface than the first end surface. At least one ventilation recess is arranged between two adjacent ones of the teeth in the circumferential direction in a portion of the insulator that covers the first end surface.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: October 18, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Hiroshi Matsumoto
  • Patent number: 9419479
    Abstract: An electric machine has a stator that comprises a plurality of laminations with teeth and cooling apertures about a central opening. When the laminations are stacked to form the stator core, the teeth of adjacent laminations cooperate to form slots disposed circumferentially about the central opening that are configured to receive a plurality of stator windings, and the cooling apertures angularly spaced about the central opening cooperate to form cooling manifolds that extend along a length of the stator core. A portion of the laminations has their cooling apertures offset from other laminations in the stack in a manner to create a plurality of flow paths transverse to the manifolds. The transverse flow paths extend angularly between laminations and adjacent manifolds. A header assembly directs flow into and out of the stator core.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: August 16, 2016
    Assignee: Baldor Electric Company
    Inventors: Boris A. Shoykhet, Andreas A. Meyer, Richard F. Schiferl, Qimin Dong, Michael Brinkmann
  • Patent number: 9372515
    Abstract: A chassis sub-assembly for computing devices includes a first heat sink plate and a second heat sink plate. The first heat sink plate includes a first plurality of perforations and the second heat sink plate includes a second plurality of perforations. The chassis sub-assembly also includes a first computing device and a second computing device. Each of the first and second computing devices is positioned between the first heat sink plate and the second heat sink plate. The first and second computing devices are in contact with both the first and second heat sink plates, and define a channel gap between the first and second computing devices. At least some of the first and second plurality of perforations are aligned with the channel gap. The first plurality of perforations, the channel gap, and the second plurality of perforations define an airflow channel.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: June 21, 2016
    Assignee: Evtron, Inc.
    Inventor: Andrew William Mayhall
  • Patent number: 9369018
    Abstract: A manufacturing method for manufacturing a rotating electrical machine equipped with a stator that includes a continuously wound coil unit achieved by continuously winding concentrated winding-type coils via cross wires, with coil wire having a rectangular section.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: June 14, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Yuichiro Tanaka, Takashi Ishigami
  • Patent number: 9362788
    Abstract: An electric machine has a stator that comprises a plurality of laminations with an outer periphery, and each of the laminations has teeth about a central opening such that when the laminations are stacked side-by side to form the stator core, the plurality of teeth of adjacent laminations cooperate to form slots disposed circumferentially about the central opening that are configured to receive a plurality of stator windings. Each of the laminations has a plurality of cooling apertures angularly spaced about the central opening. The cooling apertures of adjacent laminations cooperate to form cooling manifolds that extend along a length of the stator core. A portion of the laminations has their cooling apertures offset from other laminations in the stack in a manner to create a plurality of flow path transverse to the manifolds and angularly between laminations and adjacent manifolds.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: June 7, 2016
    Assignee: Baldor Electric Company
    Inventor: Boris A. Shoykhet
  • Patent number: 9306437
    Abstract: A method for producing a stator for an electrical machine as an internal rotor, in particular an electric motor. This method involves providing a multiplicity of separate pole teeth, which are wound. The ends of the winding wire of the pole teeth are connected to one another to create a flexible annular pole tooth assembly, and the flexible assembly is inserted into an injection mold and centered. The assembly located in the mold is encapsulated or sealed in a molding compound. In this way, a dimensionally stable stator with particularly good insulating properties can be produced.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: April 5, 2016
    Assignee: Continental Automotive GmbH
    Inventors: Rüdiger Brandau, Kurt Siebald
  • Publication number: 20150097461
    Abstract: A rotary electric machine may include a rotor that includes a laminated core arranged on a rotor shaft, wherein the rotor has at least one end-winding cover that encloses the laminated core in the axial direction of the rotor shaft, and the end-winding cover has an outer face, and a sensor track of a sensor is arranged on the outer face of the end-winding cover.
    Type: Application
    Filed: February 26, 2013
    Publication date: April 9, 2015
    Inventor: Michael Bulatow
  • Patent number: 8991035
    Abstract: A method of manufacturing a laminated core includes: preheating a rotor core body; attaching a cull plate onto a surface of the body removed from a preheating device; placing the body in a resin-sealing mold; heating and liquefying resin in resin reservoir pots by the mold; extruding the liquefied resin into plural magnet insertion holes and curing the resin; and ejecting a laminated rotor core from the mold and detaching the plate, wherein attaching the plate and detaching the plate are performed at a same station, and the plate detached is used as the plate at the attaching of the cull plate.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: March 31, 2015
    Assignee: Mitsui High-Tec, Inc.
    Inventors: Hidemi Sasaki, Masayuki Okabe
  • Patent number: 8984742
    Abstract: A three dimensional soft magnetic metal mass suitable for milling is formed wrapping soft magnetic metal ribbon into a three dimensional shape and then applying adhesive to the three dimensional shape. The adhesive permeates the three dimensional shape. The adhesive is then cured. If the soft magnetic metal mass is made as a toroid, then it could be processed into an electromechanical component. The electro-mechanical component would then be suitable for use in very high frequency electric motors.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: March 24, 2015
    Assignee: Light Engineering, Inc.
    Inventors: Thomas J. Berwald, Kendall Scott Page
  • Patent number: 8981615
    Abstract: A wound stator core disclosed is substantially formed from a spirally piled strip. In an embodiment, the strip with a specific length is formed with a first dentition and a second dentition, whereas the first dentition is featured by a first slot-number ratio and is composed of a first side and a plurality of first teeth in a manner that the plural first teeth are arranged as an array on the first side; which is also same to the second dentition while allowing the second slot-number ratio to be equal to the first slot-number ratio. In addition, each first tooth is formed with a first dental part at a free end thereof, while also each second tooth is formed with a second dental part at a free end thereof, and the first dental part of each first tooth is connected to the second dental part of its corresponding second tooth.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: March 17, 2015
    Assignee: Industrial Technology Research Institute
    Inventors: Cheng-Hsuan Lin, Wen-Yang Peng, Han-Ping Yang, Jung-Kang Peng
  • Patent number: 8981609
    Abstract: Disclosed is a generator for a wind energy installation having a rotor which has permanent magnets and is directly connected for drive purposes to a blade rotor of the wind energy installation, and having a stator which has an iron core composed of laminates. The generator is formed without the rotor or the stator on the external circumference as a completely surrounding housing, and the laminates of the stator are connected to one another by adhesive bonding and/or welding.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: March 17, 2015
    Assignee: Wind-Direct GmbH
    Inventor: Stephan Joeckel
  • Patent number: 8975800
    Abstract: A rotor (100) for an electric motor (1000). The rotor (100) has a rotor shaft (10) and a rotor core (20) attached onto the rotor shaft (10). The rotor core has a plurality of core laminations (40, 140) arranged along an axis (A) of the rotor core (20), and has a plurality of poles of at least one pole pair, the core lamination (40, 140) having: a central recess (70, 170) through which the rotor shaft (10) passes and which has a contour (71, 171) as well as adjacent areas (AF), and a plurality of receiving structures arranged at peripheral angular positions in order to each form a receiving element for a pole-forming element on the rotor core (20).
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: March 10, 2015
    Assignee: Hilti Aktiengesellschaft
    Inventors: Reinhard Riedl, Jochen Erhardt
  • Patent number: 8963399
    Abstract: An induction machine short circuit stop is interposed between a brace and a machine component, such as a generator building bolt, in order to limit component motion during a short circuit event. The stop is a block of resilient non-conductive material that is oriented proximal the machine component at a desired spaced gap. Gap dimensions may be modified by use of different height stop blocks and/or shims. The stop is affixed to the brace by straps, cordage or fasteners, such as threaded studs. The stop is suitable for retrofitting existing induction machines in the field or in refurbishing service centers.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: February 24, 2015
    Assignee: Siemens Energy, Inc.
    Inventors: Avinash M. Tekawade, David F. Yurko, Domingo J. Fumero, Sean Woosley
  • Patent number: 8963667
    Abstract: Packet of plates provided with fixing means, characterized in that at least some of the plates have a cut-out to form a housing receiving an insert provided with fixing means and having a fixing axis, the housing having at least one wall cooperating with an exterior surface of the insert to retain the insert along the fixing axis. Method of manufacturing such a packet.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: February 24, 2015
    Assignee: R. Bourgeois
    Inventor: Raymond Nicolas Bourgeois
  • Patent number: 8922084
    Abstract: There is provided a rotor core which increases the quality and reliability thereof by preventing the occurrence of a core separation of the rotor core. There is provided a rotor core including a plurality of substantially cylindrical core blocks which are stacked on each other; and a plurality of magnets, characterized in that a plurality of magnet holes extending in an axial direction are provided in the plurality of core blocks so as to extend over the plurality of core blocks in that the plurality of magnets are accommodated in each of the plurality of magnet accommodation holes and fixed therein with a resin, and in that an axial position of core block boundary planes where the plurality of core blocks are brought into abutment with each other and an axial position of magnet boundary planes where the plurality of magnets are brought into abutment with each other differ from each other.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: December 30, 2014
    Assignee: Mitsui High-Tech, Inc.
    Inventors: Akira Nagai, Go Kato
  • Patent number: 8916254
    Abstract: A method for manufacturing a laminated core is provided that makes positions of boundary parts of laminated blocks and improves an efficiency of a welding operation of the blocks. The above-described object is achieved by the method of manufacturing the laminated core 10 including a process that forms a plurality of blocks 12 having a plurality of welding parts 13 to 15 of different forms or colors at intervals of prescribed angles in the circumferential direction, a process that laminates the plurality of blocks 12 under a state that the blocks are rotated at intervals of the prescribed angles and a process that welds the welding parts 13 to 15 having the different forms or colors of the laminated blocks 12 to form integrally the plurality of blocks 12.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: December 23, 2014
    Assignees: Mitsui High-Tec, Inc, Toyota Jidosha Kabushiki Kaisha
    Inventors: Akira Nagai, Jin Oda, Tatsuhiko Mizutani, Yosuke Kurono
  • Publication number: 20140368076
    Abstract: An electric motor includes a stator having multiple magnetic poles and a rotor rotatably mounted to the stator. The rotor includes a shaft, a commutator and a rotor core fixed to the shaft; and windings wound on the rotor core and electrically connected to the commutator. The rotor core is formed by stacking a plurality of laminations. Each lamination includes an inner ring having a hole for fixing the shaft; an outer ring radially spaced from the inner ring; multiple teeth extending outwardly from the outer ring, and multiple ribs connecting the inner ring to the outer ring. Each rib has a width w measured in a circumferential direction of the lamination. The number of ribs is n. The width w and the number n satisfy the formula: 0.75?n×w2?64, where the width w is measured in millimeters.
    Type: Application
    Filed: June 12, 2014
    Publication date: December 18, 2014
    Inventors: Rui Feng Qin, Di WANG, Ji Yu LIANG, Guo Dong REN, Yong Bin LI, Xiao Wu XIE, Yao ZHAO, Xian Ming WU, Sheng HAN
  • Patent number: 8907542
    Abstract: An alternator of high quality and high performance includes a rotor, a stator core arranged so as to surround the rotor and having a plurality of axially extending slots arranged at a predetermined circumferential pitch, and a stator having a stator winding fitted into the slots. The stator core includes element iron cores of a hexahedral shape which are deformed to curve, with their adjacent end faces being abutted and bonded to each other, each of the element iron cores being composed of thin steel plates laminated and integrated with one another, with concave and convex portions formed on the thin steel plates being fitting with each other. The concave and convex portions are formed on a borderline between a compressive region of the stator core at an inner diameter side thereof and a tensile region of the stator core at an outer diameter side thereof.
    Type: Grant
    Filed: July 2, 2007
    Date of Patent: December 9, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Wakaki Miyaji, Shinji Nishimura
  • Patent number: 8887376
    Abstract: The invention relates to a method for the production of a soft magnetic core for generators and generator with a core of this type. To produce a core, a plurality of magnetically activated and/or magnetically activatable textured laminations is produced from a CoFeV alloy. This plurality of laminations is then stacked to form a core assembly. Then the core assembly, if consisting of magnetically activatable laminations, is magnetically activated. Finally, the magnetically activated core assembly is eroded to produce a soft magnetic core. A core of this type is suitable for a generator with a stator and a rotor for high-speed aviation turbines, the laminations in the core assembly being oriented in different texture directions relative to one another.
    Type: Grant
    Filed: July 18, 2006
    Date of Patent: November 18, 2014
    Assignee: Vacuumschmelze GmbH & Co. KG
    Inventors: Joachim Gerster, Witold Pieper, Rudi Ansmann, Michael Koehler, Michael Von Pyschow
  • Patent number: 8887377
    Abstract: The method for manufacturing a stator core includes: a punching step in which magnetic segments are punched out of an electromagnetic steel sheet that is coated with an organic insulating coating; a laminating step in which a laminated body is formed by laminating a predetermined number of the punched magnetic segments; a first preheating step in which a welding position on a wall surface of the laminated body is heated locally from a first end to a second end in a direction of lamination to decompose an organic component in the insulating coating thermally at the welding position; and a first welding step in which the welding position at which the organic component in the insulating coating is decomposed thermally is welded from the first end to the second end in the direction of lamination to interconnect and integrate the laminated magnetic segments.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: November 18, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kazuya Hasegawa
  • Patent number: 8881362
    Abstract: In a stator manufacturing method to manufacture a stator in which divided-core assemblies are arranged in a cylindrical shape, each of which includes a divided-core member having a teeth portion on which a coil is wound. In this method, the divided-core assemblies are inserted in the cylindrical shape into a fixed mold, resin sheets containing glass fibers or carbon fibers are disposed on coil-end portions of the cylindrically-arranged divided-core assemblies, and a slide part of a movable mold applies pressure to and molds the resin sheets, thereby combining the divided core assemblies into a single unit. The movable mold is operated to position the divided-core assemblies in place by a cylindrical part and then apply pressure to and mold the resin sheets by the slide part.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: November 11, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Joji Yoshimura, Koji Nakanishi, Yasuhiro Ueno
  • Patent number: 8841812
    Abstract: An object of the present invention is to provide a squirrel-cage induction motor with high efficiency. In a squirrel-cage induction motor including a stator in which stator windings are wound in a number of stator slots arranged at intervals in the vicinity of the inner periphery of a stator core and a rotor in which rotor conductors are embedded in a number of rotor slots arranged at intervals in the vicinity of the outer periphery of a rotor core and end rings are provided at both ends of the rotor core, the rotor core is formed of a plurality of blocks, an annular short-circuit ring is provided between respective blocks of the rotor core to short-circuit the rotor conductors, and laminated thickness of the rotor core is made larger than laminated thickness of the stator core.
    Type: Grant
    Filed: February 24, 2011
    Date of Patent: September 23, 2014
    Assignee: Hitachi Ltd
    Inventors: Kazuo Nishihama, Hiroyuki Mikami, Tadahiro Shimozono, Keiichiro Kaihatsu, Atsushi Abe
  • Publication number: 20140252911
    Abstract: A rotor arrangement for an electric prime mover (6) of a motor vehicle has a rotor shaft (34), on which at least two laminate stacks (36, 38, 40, 42, 44, 46) are arranged. At least one laminate stack (36) is configured to enable a changed moment of inertia of this laminate stack (36) with respect to another laminate stack (38).
    Type: Application
    Filed: March 10, 2014
    Publication date: September 11, 2014
    Applicant: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
    Inventor: Christian Hauck
  • Patent number: 8829759
    Abstract: A rotating electrical machine includes a rotor configured to rotate about an axis. The rotor includes a rotor lamination stack having a plurality of sheets pressed into a composite assembly in an axial direction and being radially divided into an inner mechanical part and an outer electrical part. A rotor winding is disposed in the electrical part of the rotor lamination stack. A stator is concentrically surrounding the rotor. A plurality of shear bolts is disposed in the mechanical part and configured to reach through the rotor lamination stack. A plurality of further bolts is disposed in the electrical part, the plurality of shear bolts and a plurality of further bolts being configured to press the plurality of sheets in the axial direction.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: September 9, 2014
    Assignee: Alstom Renewable Technologies
    Inventors: Alexander Schwery, Serdar Cifyildiz, Hanspeter Walser, Ricardo Okai
  • Patent number: 8823239
    Abstract: The invention relates to an electrical machine (8), in particular an electric motor, suitable for the adjustment by external force of elements of a motor vehicle, essentially for driving a steering booster. The inventive electrical machine comprises a rotor (7) and a shaft (10), the rotor having a plurality of plates (5), wherein the plates (5) are premounted on the shaft either individually or as a plate assembly (6) or by means of a plurality of plate assemblies (6), the rotor (7) being connected to the shaft (10). The plates (5) have resilient lugs (3) for fixing the plates (5) and/or plate assemblies (6) to the shaft (10). Furthermore, the plates (5) of the plate assemblies (6) comprise centering lugs (1) which serve to radially center the plate assembly (6) relative to the shaft (10).
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: September 2, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Stefan Ossenkopp, Joachim Becker, Holger Klatte, Erik Maurer, Ngoc-Thach Nguyen, Stefan Stoermer, Bruno Holzwarth, Tilo Koenig
  • Publication number: 20140209728
    Abstract: A stator core is formed from a continuous strip of wound sheet stock material, in which the sheet stock material is converted from the sheet stock to a formed material including winding slot cutouts. This strip of formed material is then wound into the stator core, with the winding slot cutouts in the formed material maintained at a substantially constant width throughout most of the radial extent of the resulting winding slots in the finished article. However, one or more of the radially innermost and radially outermost layers may define winding slot cutouts that are wider than the other winding slot cutouts. Where several radial layers are altered in this way, the cutout widths are progressively expanded such that the resulting winding slot has terminal ends with edges that are effectively “radiused” or rounded, thereby protecting windings near the edge of such slots.
    Type: Application
    Filed: October 18, 2013
    Publication date: July 31, 2014
    Applicant: L.H. Carbide Corporation
    Inventors: Thomas R. Neuenschwander, Barry A. Lee
  • Publication number: 20140210284
    Abstract: A motor includes a rotation shaft, a stator, and a rotor. The stator includes an armature winding and a stator core including a main core portion with an axial stack of core sheets and a magnetic plate on an end thereof. Each core sheet includes a tooth formation portion around which the armature winding is wound. The magnetic plate includes a stacked portion and an axially extending portion. The stacked portion stacked on the axial end of the main core portion and includes an end located toward the rotor. The axially extending portion extends toward the outer side in the axial direction from the end of the stacked portion located toward the rotor and is opposed to the rotor in a radial direction of the motor. The axially extending portion is shaped to be magnetically skewed in a circumferential direction relative to the tooth formation portion and the stacked portion.
    Type: Application
    Filed: January 23, 2014
    Publication date: July 31, 2014
    Inventors: Tatsunori BANBA, Hiroshi KATAI, Yuusuke TATEISHI, Yuuji YAMASHITA, Takumi SUZUKI, Kenji OBATA, Yoshimasa KINPARA, Takashi NAGAYA
  • Publication number: 20140191611
    Abstract: The invention relates to a magnetic rotor core for an electric rotary machine, including a stack of magnetic laminations having some poles provided with pole tips, said core including a stack that comprises laminations of which at least one of the poles has at least one at least partially truncated pole tip, preferably a single pole tip.
    Type: Application
    Filed: August 1, 2012
    Publication date: July 10, 2014
    Applicant: MOTEURS LEROY-SOMER
    Inventor: Patrick Vohlgemuth
  • Publication number: 20140132107
    Abstract: There is described a method and apparatus for forming a core for an electrical machine, in which a stamped metal strip (4a, 4b) is wound onto a mandrel (22), to form a helical winding. The diameter of the mandrel is then increased to apply tension to the wound strip, while the coils of the wound strip are held between clamps (24, 25). The coils of the wound strip are then fixed relative one to another (50, 51), while the coil is held at the increased diameter. The diameter of the mandrel is then reduced to disengage the laminated core from the mandrel. To produce a rotor or stator for an electrical machine, electrical coils are mounted in slots formed in the inner or outer surface of the core. The rotor or stator may then be incorporated into an electrical machine such as a motor or generator.
    Type: Application
    Filed: November 13, 2013
    Publication date: May 15, 2014
    Applicant: Trancerie Emiliane S.P.A.
    Inventors: Franco Felisa, Orazio Bovaia
  • Patent number: 8716914
    Abstract: In a vehicle AC generator, a stator core (42) is formed by laminating thin steel sheets, the stator core (42) being provided with a plurality of slot portions (43) which accommodate a stator winding (41) and tooth portions (44) which define adjacent ones of the slot portions; the stator winding (41) is disposed in the slot portions to constitute a stator (4); the stator core (42) is filled with varnish (45) between laminates of each tooth (44) at least in an inner diameter end surface region which faces the rotor (3) and is coated with epoxy resin varnish (46) on the tooth surface of the inner diameter end surface region to form an anti-rust film.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: May 6, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazunori Tanaka, Takatoshi Masuda
  • Publication number: 20140111884
    Abstract: A thin spindle motor having a stator core with sufficient swaging strength even using thin magnetic steel sheets is provided, whereby the magnetic loss and the power consumption of the spindle motor are reduced. The stator core is formed by laminating plural stator laminations with a thickness of 0.1 to 0.2 mm and joined by a swaging portion. The swaging portion has an approximately rectangular shape having long sides extending along a radial direction when viewed from an axial direction. The swaging portion has a cross section with a middle portion parallel to the radial direction and a slope portion at the both sides when viewed from a circumferential direction, thereby forming a recess. The recess has a depth that is less than the thickness of the stator lamination whereby the swaging portion does not cut the stator lamination.
    Type: Application
    Filed: October 11, 2013
    Publication date: April 24, 2014
    Applicant: MINEBEA CO., LTD.
    Inventors: Hideaki SHOWA, Ryoichi KUROSAWA, Hironobu TSUGE
  • Publication number: 20140103754
    Abstract: A laminated rotor and an electric machine including the laminated rotor are disclosed. In an embodiment, a rotor comprises a plurality of stacked laminations, wherein each lamination includes a plurality of radially extending slots arranged about a circumference of each of the plurality of laminations, and the plurality of radially extending slots in successive laminations in the stack are aligned. A stud member passes longitudinally through at least one hole in the lamination stack, and a plurality of coils are positioned within the plurality of slots. Fewer than all of the plurality of slots have a coil positioned therein, leaving at least three slots empty. Balance members may be placed in the slots that do not have a coil positioned therein to balance the rotor.
    Type: Application
    Filed: July 6, 2011
    Publication date: April 17, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Dmitry Yurevich Semenov, Anthony Salvatore Arrao, Mikhail Avramovich Avanesov, Richard Nils Dawson, Evgeny Victorovich Kazmin, Timothy Gerald Schmehl, Yury Danilovich Vinitsky
  • Patent number: 8698371
    Abstract: A rotor includes a core made of a laminated steel sheet assembly including a plurality of laminated magnetic steel sheets each having a flat plate shape, the core including a through hole at a rotation center, a shaft inserted in a through hole of the core, an inner-peripheral-side welded part located on an inner peripheral side of the core, the welded part being a welded section joining between adjacent steel sheets and joining the laminated steel sheet assembly to the shaft over a laminating direction, and an outer-peripheral-side welded part located on an outer peripheral side of the core and in an end part in the laminating direction, the welded part being a welded section joining between some of the magnetic steel sheets, the joined steel sheets including a steel sheet forming an end face of the core in the laminating direction.
    Type: Grant
    Filed: March 15, 2010
    Date of Patent: April 15, 2014
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masaya Komada, Masayuki Matsushita
  • Publication number: 20140070658
    Abstract: A lamination assembly having a lamination stack including a plurality of lamination members, and at least one inter-lamination thermal transfer member coupled to at least one of the plurality of lamination members. The at least one inter-lamination thermal transfer member establishes a heat dissipation path from the lamination stack.
    Type: Application
    Filed: September 10, 2012
    Publication date: March 13, 2014
    Applicant: REMY TECHNOLOGIES, L.L.C.
    Inventor: Colin Hamer
  • Publication number: 20140062251
    Abstract: An embedded magnet type electric motor rotor (10) including with a core (11) which is formed by laminating a plurality of electrical steel sheets, magnets (M) which are arranged in a plurality of magnet slots (30) which are formed in a circumferential direction of the core, and non-core parts (35, 36) which are positioned in clearances between the magnet slots and the magnets which are arranged in the magnet slots, wherein in the rotor, reinforcing parts (40) which reinforce the core in an axial direction are provided at least at two non-core parts of the core.
    Type: Application
    Filed: September 5, 2013
    Publication date: March 6, 2014
    Applicant: FANUC CORPORATION
    Inventors: Yohei ARIMATSU, Shinobu TAKANO
  • Publication number: 20140037476
    Abstract: An electric motor is provided, including a stator having two electromagnetic poles diametrically opposite each other, a rotor including a rotor core configured for being rotatably mounted with a shaft for rotation relative to the stator. The rotor core is formed by stacking a plurality of laminations each of which has a central hole and a plurality of generally radially extending teeth. The stator and the rotor have geometric attributes such that: R1=G*0.9968, wherein G is defined as thickness of a field yoke, and R1 is defined as a distance from an outside edge of a central hole to bases of the teeth. A compressor assembly is also provided that employs the present motor.
    Type: Application
    Filed: August 2, 2013
    Publication date: February 6, 2014
    Applicant: MAT INDUSTRIES, LLC
    Inventors: Steven Bradley Smith, Robert Louis Hite, Jerry David Phillips
  • Patent number: 8643244
    Abstract: A rotor for an induction motor has a plurality of central laminations defining a central bore extending along an axis. End laminations are at each axial end of the central laminations. Metal is within gaps formed between lamination teeth. The end laminations have teeth extending radially outwardly from a central ring portion. A bore is formed in a face of the end laminations facing outwardly, and adjacent to where the teeth connect into the central ring portion. A motor and method are also described.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: February 4, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Joseph Kenneth Coldwate, Eric A. Brust