Powdered Metal Patents (Class 310/44)
  • Patent number: 10978967
    Abstract: A PM line-start motor, preferably motors having a power of at least 5 kW, and a switch-on method therefor are provided. The motor includes a rotor and a stator having a stator winding designed as a pole-reversible rotary field winding. With the aid of the pole-reversible rotary field winding, the regenerative braking torque generated during the asynchronous high-run operation can be avoided, preferably by use of a sequence controller to control the changeover of the pole-reversible rotary field winding in the run-up phase.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: April 13, 2021
    Assignee: KSB SE & Co. KGaA
    Inventors: Gerhard Huth, Hans-Georg Schirmer
  • Patent number: 10927895
    Abstract: A dustproof bearing assembly includes a base having a shaft tube. The shaft tube has an open end with an opening. At least one bearing is coupled to an inner periphery of the shaft tube. A rotating member includes a shaft seat. A shaft includes a first end coupled to the shaft seat and a second end extending through a shaft-receiving hole of the at least one bearing. A dustproof member includes a lower face and an upper face. The lower face is spaced from the open end of the shaft tube. The dustproof member covers the opening. The upper face of the dustproof member abuts a bottom of the shaft seat. The dustproof member has an outer diameter larger than an inner diameter of the shaft tube. The dustproof bearing assembly can be used in a motor.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: February 23, 2021
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Chia-Wen Kang, Yi-Ming Chu
  • Patent number: 10797540
    Abstract: A stator includes a first core and a second core. The first core has a yoke extending in a circumferential direction about an axis line and having a second insertion hole, and a tooth extending from the yoke in a direction toward the axis line and having a first insertion hole. The second core has a first part disposed in the first insertion hole and a second part disposed in the second insertion hole and formed of amorphous metal or nanocrystal metal.
    Type: Grant
    Filed: May 30, 2016
    Date of Patent: October 6, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuhiko Baba, Masahiro Nigo
  • Patent number: 10770209
    Abstract: Provided is soft magnetic powder constituted by an Fe alloy containing Si, in which soft magnetic particles of the soft magnetic powder include a SiO2 layer formed on a surface of the particles, and a surface layer formed directly on the SiO2 layer. The surface layer includes a first material that constitutes a matrix and a second material that is dispersed in the matrix. The first material is silicone or phosphate, and the second material is silicone or phosphate and is different from the first material.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: September 8, 2020
    Assignees: AutoNetworks Technologies, Ltd., Sumitomo Wiring Systems, Ltd., Sumitomo Electric Industries, Ltd.
    Inventors: Shintaro Nanbara, Kazushi Kusawake, Takashi Takada
  • Patent number: 10632739
    Abstract: A roller module includes a roller, a magnetic bearing, a permanent magnet, at least one pair of magnetic coring, and a plurality of gap sensors. The roller has a protrusion and has a cylindrical shape. The protrusion is formed at both outer surfaces of the roller with a stepped portion and has the cylindrical shape. The magnetic bearing is formed at the roller. The permanent magnet is formed at the roller. At least one pair of magnetic coring covers an outer circumference of the protrusion. The gap sensors are formed along an axial direction and a radial direction of the roller.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: April 28, 2020
    Assignee: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Cheol-Hoon Park, Taik-Min Lee, Dong-Woo Kang
  • Patent number: 10224134
    Abstract: A method of manufacturing a reactor includes a pair of coils and a pair of core units of partial I-shaped cores with gap members butted together and mounted in the coils. The respective ends of the I-shaped cores are pressed against the ends of a pair of U-shaped cores. The U-shaped cores and the I-shaped cores are formed by pressing powder in movable dies that preheat any burrs formed during pressing to be positioned in a direction different from the winding axis direction to avoid any contact with the coil.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: March 5, 2019
    Assignee: TAMURA CORPORATION
    Inventors: Ryo Nakatsu, Toshikazu Ninomiya, Kotaro Suzuki, Tsutomu Hamada
  • Patent number: 10128705
    Abstract: An electric motor includes a case, a stator that includes a stator laminaiton and end-windings, a rotor coupled to the case via at least one rotor bearing. The rotor includes a hollow cylindrical body, a first shaft portion, and a second shaft portion. The hollow cylindrical body includes an inner wall, an outer wall, a first distal end, and a second distal end. The first shaft portions couples to the first distal end and the second shaft portion couples to the second distal end. The second shaft portion includes a fluid feed tube formed therewith having a fluid receive end and a fluid feed end, the fluid feed end extending to a central inner portion of the hollow cylindrical body. A plurality of fluid exit ports adjacent the first distal end and the second distal end of the hollow cylindrical body spray fluid onto components of the stator.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: November 13, 2018
    Assignee: Tesla, Inc.
    Inventors: Bozhi Yang, Tomas Vianna Martins, Scott Michael Graves, Ethan Swint, Eric Bellemare, Lev Fedoseyev, Benjamin Dellal, Leif E. Olsen, Alexander Hain
  • Patent number: 9866093
    Abstract: The brushless DC motor of the present invention comprises a permanent magnet rotor rotating coaxially with and inside of the stator containing the electric windings, separated by a radial, axially extending gap. The rotor can be formed of four or more permanent, e.g., ferrite ceramic magnets, spaced substantially equidistantly circumferentially around the rotor and extending radially along the axial length of the rotor. The preferred ferrite magnets are substantially corrosion resistant, and thus durable in the wet rotor environment, in which it may be used, sufficient to withstand the effects of even hot salt water. Preferably, four of the permanent magnets are bar magnets, i.e., rectangular in cross-section, extending radially and perpendicularly to the adjacent magnets. Most preferably, the bar magnets are separated by generally wedge-shaped, or quadrant-shaped, sections of magnetic material.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: January 9, 2018
    Assignee: Taco, Inc.
    Inventors: Di Wu, Vladislav Milchev Stakev, Robert F. Birkenstock, Jr.
  • Patent number: 9722514
    Abstract: There is provided a motor drive comprising: a temperature sensor arranged to sense a temperature of the drive; a braking resistor; switching means arranged when activated to cause current to flow to the braking resistor; and controlling means arranged to activate the switching means when the sensed temperature falls below a predetermined threshold. There is also provided a method of controlling a temperature of a motor drive comprising a braking resistor. The method comprising comprises: monitoring a temperature of the drive; and activating switching means to cause current to flow to the braking resistor when the monitored temperature falls below a predetermined threshold.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: August 1, 2017
    Assignee: NIDEC CONTROL TECHNIQUES LIMITED
    Inventor: James Frank Chmielewski
  • Patent number: 9706930
    Abstract: Provided is an optical imaging probe that is able to obtain a stable observation image by a dynamic pressure bearing. An optical imaging probe for guiding rearward a light entering a front end includes: a rotation driving source adapted to drive and rotate a rotor; a tubular rotation shaft inserted and fixed over an axial direction in a rotation center side of the rotor; an optical fiber inserted in the tubular rotation shaft, the front end of which a light is able to enter; and a bearing member supporting the tubular rotation shaft in a rotatable manner, and the bearing member configures a dynamic pressure bearing adapted to generate a high lubricating oil film pressure locally at multiple positions in a circumference direction.
    Type: Grant
    Filed: July 15, 2015
    Date of Patent: July 18, 2017
    Assignee: Namiki Seimitsu Houseki Kabushiki Kaisha
    Inventors: Hiroshi Yamazaki, Eri Fukushima, Takafumi Asada
  • Patent number: 9709749
    Abstract: Provided is optical imaging probe that is able to obtain stable observation image by optical path correction. It includes a rotation driving source adapted to drive and rotate a rotor; a first single-mode optical fiber inserted and fixed over the axial direction in the rotation center side of the rotor, the front end of which light is able to enter; a second single-mode optical fiber supported at the rear end side of the first single-mode optical fiber in a non-rotatable manner; and a gap and optical path correcting means interposed between the first single-mode optical fiber and the second single-mode optical fiber, and the optical path correcting means is adapted to expand and collimate the light transmitted from one single-mode optical fiber and pass it through the gap, and then guide it to the other single-mode optical fiber.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: July 18, 2017
    Assignee: Namiki Seimitsu Houseki Kabushiki Kaisha
    Inventors: Hiroshi Yamazaki, Eri Fukushima, Takafumi Asada
  • Patent number: 9496763
    Abstract: A driving unit includes a stator, a housing including a tubular section to accommodate the stator, a cover coupled to the housing to block an upper opening of the tubular section, and a bent wire rod defined by a wire to press the stator against the tubular section, the bent wire rod being arranged between a top surface of the stator and a rear surface of the cover while being compressingly deformed along an axis of the stator. The bent wire rod has an annular or substantially annular shape with an opened portion when seen along the axis, and includes projections projecting upward along the axis and depressions projecting downward along the axis being arranged alternately and successively. An elastic force from the bent wire rod causes the stator to receive a downward force along the axis. The stator is pressed against the tubular section to hold the stator in the housing.
    Type: Grant
    Filed: December 4, 2015
    Date of Patent: November 15, 2016
    Assignee: YAMAHA MOTOR ELECTRONICS CO., LTD.
    Inventors: Tomonari Shiraishi, Toshihiko Nagata, Toshihide Ootani, Hideyuki Kobayashi
  • Patent number: 9362791
    Abstract: A magnet constituting a magnetic pole of a rotor includes an annular ferrite bond magnet provided on an outer circumference of a rotation shaft and a plurality of sintered ferrite magnets arranged on an outer circumference of the ferrite bond magnet. The ferrite bond magnet includes, on an outer circumferential surface thereof, curved concave portions convexed toward a side of the rotation shaft. The sintered ferrite magnets are arranged on the curved concave portions, and include a surface on a side of the stator that is formed in a curved convex shape toward the side of the stator, and a center portion whose thickness with respect to the circumferential direction is formed to be larger than a thickness of an edge portion, wherein magnetization direction is oriented in polar anisotropy.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: June 7, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Atsushi Matsuoka, Kazuhiko Baba
  • Patent number: 9203272
    Abstract: The end windings in the stator and rotor are major sources of core-end heating in large electric machines. This invention discloses a Stealth End Winding that makes some of the end-turns within these end windings to be magnetically invisible or stealth in order to reduce the core-end heating. It employs permanent magnets in proximity of these end windings to flip the magnetic field of stealth end-turns, making them to point in a direction away from the core-end. This action reduces the magnetic field that hits the core-end, which in turn reduces core-end heating. A Stealth End Winding can potentially eliminate prevailing devices such as the flux shield, flux shunt, core-end stepping, slit-teeth etc that have been used so far to reduce the core-end heating. Elimination of core-end stepping reduces the field current thereby increase the efficiency and power rating. Elimination of flux shield reduces cost and cooling needs.
    Type: Grant
    Filed: June 27, 2015
    Date of Patent: December 1, 2015
    Inventor: Dantam K. Rao
  • Patent number: 9154004
    Abstract: In the rare earth sintered magnet, the ratio of R2 to the sum of R1 and R2 that are contained in crystal grain boundaries surrounding the crystal grains in the rare earth sintered magnet body is higher than the ratio of R2 to the sum of R1 and R2 in the crystal grains, and the concentration of R2 increases from the central portion of the rare earth sintered magnet body toward the surface of the rare earth sintered magnet body. In addition, the degree of unevenness in residual magnetic flux density on the surface of the rare earth sintered magnet body is smaller than 3.0%.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: October 6, 2015
    Assignee: TDK CORPORATION
    Inventors: Makoto Iwasaki, Fumitaka Baba, Satoshi Tanaka, Hideki Sasaki, Takahide Kurahashi, Hitoshi Maro, Keiichi Morimoto, Seiichi Endo
  • Patent number: 9109429
    Abstract: An engineered dispersed particle-cellular nanomatrix composite material is disclosed. The engineered dispersed particle-cellular nanomatrix composite material is configured for contact with a fluid and configured to provide a selectable and controllable transition from one of a first strength condition to a second strength condition that is lower than a functional strength threshold, or a first weight loss amount to a second weight loss amount that is greater than a weight loss limit, as a function of a time in contact with the fluid.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: August 18, 2015
    Assignee: Baker Hughes Incorporated
    Inventors: Zhiyue Xu, Gaurav Agrawal
  • Publication number: 20150091397
    Abstract: A spintronic generator that provides electrical power with the motive force of natural electron spin. The utilization of natural electron spin can be enhanced with carefully matched materials, weights, and magnetic waveforms which provide precise pulsed frequencies in resonance with the materials. This resonance of the magnetic pulses provides clean abundant power. A utilization of the Zero Point Energy results in a local environment temperature drop which can be one of the sources of motive force. The harvesting of electricity can be in standard induction pick up coils controlled by direct current motor controllers using an LRC tank circuit.
    Type: Application
    Filed: August 30, 2014
    Publication date: April 2, 2015
    Inventor: KIRK MILLER
  • Patent number: 8981604
    Abstract: The invention provides an active element for an electromagnetic machine, the element comprising an alternating succession in a main direction of portions presenting a first magnetic property and of portions presenting a second magnetic property, wherein the element includes a non-magnetic covering that is thin relative to a thickness of the portions and that extends to cover a substantial fraction of an outside surface of the active element, the covering being secured to at least some of the portions and presenting sufficient strength to form a member for mechanically transmitting the magnetic forces to which the portions are subjected.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: March 17, 2015
    Assignee: Messier-Bugatti-Dowty
    Inventors: Nicolas Ziegler, Daniel Matt
  • Publication number: 20150054360
    Abstract: An object of the present invention is to provide a motor rotor support suitable for an axial gap motor and a method for manufacturing the same. The motor rotor support for supporting a magnetic body disposed on a rotor of the motor is configured by laminating single materials each formed from a hot-worked material or a cold-worked material preferably composed of an 18Mn-18Cr nonmagnetic steel.
    Type: Application
    Filed: March 27, 2013
    Publication date: February 26, 2015
    Applicants: SANWAKOGYO LTD., THE JAPAN STEEL WORKS, LTD.
    Inventors: Shinji Tanaka, Hirokazu Madarame, Toshifumi Nakajima, Kazuhiro Miyagi
  • Patent number: 8963382
    Abstract: A stator includes a ring-shaped stator core having a plurality of slots arranged in a circumferential direction and a stator coil wound around the slots. The stator coil disposed within the slots is fixed by an impregnating material applied from an inner peripheral side of the stator core. An innermost-diameter coil wire of the stator coil positioned on the innermost-diameter side within the slots is provided with a first angle section that is angled towards an outward core-diameter direction side from a center section in a core-axis direction towards one end side, and a second angle section that is angled towards the outward core-diameter direction side from the center section in the core-axis direction towards another end side. The center section in the core-axis direction of the innermost-diameter coil wire projects towards an inward core-diameter direction side.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: February 24, 2015
    Assignee: Denso Corporation
    Inventors: Shigenori Yoneda, Toshiaki Oohara
  • Publication number: 20150048696
    Abstract: A disc rotor motor is demonstrated, having at least one stator that has at least one electrical stator winding and stator teeth, which have a tooth neck composed of a soft magnetic powder composite, and having at least one disc-shaped rotor, which has permanent magnetic poles composed exclusively of ferrite magnets at least for producing torque, with the rotor and stator oriented parallel to each other and spaced apart from each other by an axial gap. In order to find an optimum between costs, weight, and overall size as well as power and torque density, the invention proposes that the stator teeth each end in a tooth end that adjoins their tooth neck and is composed of a soft magnetic powdered composite, which tooth end widens out in its cross-sectional area in comparison to the tooth neck.
    Type: Application
    Filed: August 15, 2014
    Publication date: February 19, 2015
    Inventors: Ralf Kobler, Dietmar Andessner, Christian Sandner
  • Publication number: 20150015092
    Abstract: An electric machine, especially a transversal flux machine, the stator being composed of a stack of phase segments, each phase segment having at least one stator segment and one stator winding, especially a single winding, each stator segment having an annular stator bridge, on which pole shoes are premolded, which in particular extend radially inward, and/or which extend in the direction of the rotor and/or which are situated between the rotor and the annular stator bridge, the pole shoes having the same shape, in particular, the axial width of the pole shoe decreasing with increasing radial clearance, the associated profile being disposed between a first and a second profile, the first profile being a linear function of the radial clearance, the pole back associated with the first profile being a planar area, in particular, the second profile being a circular function, in particular a circular segment function, the pole back associated with the second profile being a cylindrical section area, in particular.
    Type: Application
    Filed: January 21, 2013
    Publication date: January 15, 2015
    Inventor: Florian Dreher
  • Publication number: 20150015093
    Abstract: A rotor for an electrical machine, in particular synchronous reluctance machine, is provided. The rotor is formed as a cylindrical structure having a magnetically soft element formed with an even number of salient magnetic poles openings for forming magnetic flux barriers. The openings are at least partially filled with a diamagnetic and/or paramagnetic medium and the diamagnetic and/or paramagnetic medium may axially and tangentially fix the magnetically soft element relative to the rotor. A method for producing such a rotor and apparatus using the rotor, including a reluctance motor, in particular a synchronous reluctance motor, that uses the rotor are provided.
    Type: Application
    Filed: January 31, 2013
    Publication date: January 15, 2015
    Inventors: Daniel Gontermann, Jochen Schaab, Joachim Schullerer
  • Patent number: 8890386
    Abstract: A rotor includes first and second rotor cores and a field magnet placed between the first and second rotor cores. Each of the rotor cores has a main body portion and a plurality of extensions, which extend radially outward from the main body portion at equal intervals in the circumferential direction. The field magnet causes the individual extensions to function as magnetic poles. A magnetic pole constituting section including at least part of each of the extensions and the first main body portion of each rotor core are made of different materials, made of the same material but formed as separate elements, or includes regions having different properties.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: November 18, 2014
    Assignee: ASMO Co., Ltd.
    Inventors: Chie Morita, Yoji Yamada, Seiya Yokoyama
  • Patent number: 8816543
    Abstract: Magnets and methods of their manufacture are disclosed for use in flywheel assemblies, such that the magnets comprise oriented fibers, such as, for example, axially-oriented fibers in a flexible rotor magnet composition to predictably allow the magnet to expand dimensionally upon rotation only in a predetermined and predictable fashion while maintaining critical contact with a rotor surface.
    Type: Grant
    Filed: April 3, 2012
    Date of Patent: August 26, 2014
    Assignee: The Boeing Company
    Inventors: Michael P. Kozar, John R. Hull, John A. Mittleider, Mark S. Wilenski
  • Publication number: 20140225462
    Abstract: A rotor includes a first rotor core, a second rotor core, a permanent magnet and a resin layer. The first rotor core includes a first core base and first claw-shaped magnetic poles arranged at equal intervals on a peripheral portion of the first core base. The second rotor core includes a second core base and second claw-shaped magnetic poles arranged at equal intervals on a peripheral portion of the second core base. The first rotor core and the second rotor core are combined with each other so that the first and second core bases are opposed to each other and the first and second claw-shaped magnetic poles are alternately arranged in the circumferential direction of the rotor. The permanent magnet includes at least a main field magnet. The main field magnet is located between the first and second core bases in the axial direction, and is magnetized in the axial direction.
    Type: Application
    Filed: January 17, 2014
    Publication date: August 14, 2014
    Inventors: Yoji YAMADA, Chie MORITA, Seiya YOKOYAMA, Koji MIKAMI, Takahiro TSUCHIYA
  • Publication number: 20140217836
    Abstract: An arrangement has at least one electrical winding having a one-part or multi-part component produced from a soft-magnetic powder composite material, which component conducts an electromagnetic flow of the winding, at least in certain regions, and has a recess provided in the region of this flow conduction, and having a one-part or multi-part, particularly metallic connector part, which has a greater mechanical strength and/or electrical conductivity and/or thermal conductivity as compared to the component, and projects into the recess of the component. In order to achieve particular thermal, mechanical and/or electrical properties, the recess penetrates the component in the region of its flow conduction, and the connector part that projects through this recess forms a mechanical, electrical and/or thermal bridge that bridges the component.
    Type: Application
    Filed: February 3, 2014
    Publication date: August 7, 2014
    Applicant: MIBA SINTER AUSTRIA GMBH
    Inventors: Christian SANDNER, Dietmar ANDESSNER, Ralf KOBLER
  • Patent number: 8772993
    Abstract: An electric motor (20) has a stator (30) and a rotor (26). The latter is equipped with a cup-like rotor part (56) and with a ring magnet (60) adhesively bonded therein, which magnet has an outer circumference (61) on which are provided elevations (84) and depressions (86) that extend at least partly in the longitudinal direction of the ring magnet (60). The outer circumference (61) of the ring magnet (60), that faces toward the cup-like rotor part (56) after assembly, is formed with at least one opening or channel (68; 69, 88), extending in a circumferential direction, that is connected to at least a plurality of the flat depressions (86). Positive mechanical engagement between adhesive and ring magnet enhances durability, and discourages any tendency toward relative rotation between the magnet (60) and the cup-like rotor part (56).
    Type: Grant
    Filed: July 21, 2008
    Date of Patent: July 8, 2014
    Assignee: EBM-Papst St. Georgen GmbH & Co. KG
    Inventors: Rainer Strohm, Tobias Maier, Volker Hildebrand, Juergen Pfaff, Arno Karwath
  • Publication number: 20140152127
    Abstract: A stator for a brushless external-rotor motor. The stator includes a stator core; a winding; and an end insulator. The stator core includes a yoke part and a tooth part which are separated. The tooth part includes a clamping part. The tooth part is formed by overlapping a plurality of silicon-steel sheets. The end insulator is sleeved on the tooth part. The winding is wound on the end insulator. The yoke part is formed by molding permeability magnetic material and includes a mounting hole in a center. A plurality of lug bosses protrudes at intervals on an outer side of the yoke par. A clamping groove is formed between two connected lug bosses. The clamping part of the tooth part is nested in the clamping groove.
    Type: Application
    Filed: March 17, 2013
    Publication date: June 5, 2014
    Applicant: ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD.
    Inventors: Songfa TANG, Jianwei JIN
  • Publication number: 20140125154
    Abstract: The present invention relates to an improved electric machine which, when operating in motor mode, produces rotational torque without using alternating magnetic polarity, but rather magnetic flux that utilizes coils arranged in a dipolar manner around an axial plane and independently removable stators.
    Type: Application
    Filed: January 13, 2014
    Publication date: May 8, 2014
    Inventors: Timm A. Vanderelli, Rodney A. Carter, Keith Klontz, Haodong Li
  • Publication number: 20140117790
    Abstract: An electrical machine having high torque and reliability and low cost, has a stator and rotor facing each other via an air gap, and a bracket at each of both shaft-direction end surfaces of the stator and rotor. The stator core is formed of a dust core, and a stator side guide portion projecting in the shaft direction concentrically with an inner peripheral portion of the stator, is provided on each of both side surface portions of the stator core, a bracket side guide portion, which is fitted to the stator side guide portion, is provided at each of the brackets, and the air gap is secured by making the stator side guide portion fitted to the bracket side guide portion.
    Type: Application
    Filed: October 30, 2013
    Publication date: May 1, 2014
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventors: Masafumi SAKAMOTO, Shigeyoshi SATO, Shunsuke TAKEGUCHI
  • Patent number: 8698360
    Abstract: A permanent magnet, in particular a permanent magnet rotor for a machine, includes a first sleeve, a first cap and a second cap arranged to close off an inner opening of the first sleeve, and a permanent magnet material formed in the inner opening of the sleeve between the first cap and the second cap. The permanent magnet material is a compressed, non-bonded powder material including hard magnetic powder material, soft magnetic powder material, or a combination of hard and soft magnetic powder material. A method for manufacturing a permanent magnet rotor is also provided.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: April 15, 2014
    Assignee: Grundfos Management a/s
    Inventors: Peter Kjeldsteen, Allan Ivo Sogaard Sorensen, Flemming Buus Bendixen
  • Patent number: 8688345
    Abstract: An electric motor includes one or more separate coil sets arranged to produce a magnetic field of the motor. The electric motor also includes a plurality of control devices coupled to respective sub-sets of coils for current control. A similar arrangement is proposed for a generator. A coil mounting system for an electric motor or generator includes one or more coil teeth for windably receiving a coil for the motor and a back portion for attachably receiving a plurality of the coil teeth. A traction control system and method for a vehicle having a plurality of wheels independently powered by a respective motor. A suspension control system and method for a vehicle having a plurality of wheels, each wheel being mounted on a suspension arm of the vehicle and being independently powered by a respective motor.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: April 1, 2014
    Assignee: Protean Electric Limited
    Inventor: Martin Boughtwood
  • 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
  • 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
  • Publication number: 20140001891
    Abstract: A permanent magnet motor includes a stator core including a core portion and chip portions each formed of dust core, a stator having a coil wound on the stator core and a rotor. The core portion includes steel plates stacked and secured to one another and an annular path portion and salient pole portions. The chip portions are attached to distal ends of the salient pole portions respectively, each chip portion having at least one axial end axially protruding from an axial end of each salient pole portion and one or more radially extending protrusions. The salient pole portions are magnetically routed by the path portion. The salient pole portions have distal end sides formed with recesses capable of accommodating the protrusions, respectively. The protrusions are accommodated in the respective recesses so that the chip portions are attached to the core portion.
    Type: Application
    Filed: June 27, 2013
    Publication date: January 2, 2014
    Inventor: Isamu NITTA
  • Publication number: 20130313922
    Abstract: Provided is an amorphous stator for use in a high-power, high-speed electric motor, and an electric motor using the amorphous stator, in which amorphous alloy powder is compressed and molded into a number of unit split cores, to then be assembled with bobbins, and to thus be easily molded into a core of a complex shape, and a core loss is minimized by using the amorphous alloy powder, to thus promote improvement of an efficiency of the motor. The electric motor includes: a stator in which a coil is wound on bobbins respectively formed in a number of unit split cores, and the number of unit split cores are assembled in an annular form by an integral or split bobbin; and a rotor that is rotated by an interaction with the stator, wherein the unit split cores are molded with mixed powder made of plate-shaped amorphous alloy powder and spherical soft magnetic powder.
    Type: Application
    Filed: January 19, 2012
    Publication date: November 28, 2013
    Applicant: AMOTECH CO., LTD.
    Inventor: Byoung Soo Kim
  • Publication number: 20130293037
    Abstract: The disclosed is a rotating electric machine, comprising a magnetic iron stator and a surface permanent magnet type rotor, wherein a wire-winding axis and a rotating axial core of the stator cross each other orthogonally, and inner diameter portion of the stator is provided with an iron core having m wire-winding salient-poles arrayed circumferentially, and becomes gradually smaller from one side to another side in its axial direction, wherein the rotor has n poles with an arrangement that north poles and south poles are arrayed alternately in its circumferential direction, peripheral portion of the rotor becomes gradually smaller from one side to another side in its axial direction, and the stator and the rotor are engaged rotatably via a tapered air gap, wherein m is a positive integer of two or more, and n is a positive even number.
    Type: Application
    Filed: April 12, 2013
    Publication date: November 7, 2013
    Inventors: Masafumi SAKAMOTO, Shigeyoshi SATO, Shunsuke TAKEGUCHI
  • Publication number: 20130293038
    Abstract: A bonded magnet of the present invention has a configuration that it contains at least a magnetic powder and a binder, and in which the magnetic powder and the binder are mixed such that a content of the magnetic powder is 98 mass % or more and a content of the binder is more than 0 mass % and 2 mass % or less. Accordingly, a bonded magnet having good magnetic characteristics and high heat resistance can be attained.
    Type: Application
    Filed: January 19, 2012
    Publication date: November 7, 2013
    Applicant: PANASONIC CORPORATION
    Inventor: Shin'ichi Tsutsumi
  • Publication number: 20130285483
    Abstract: Disclosed herein is an axial flux permanent magnet (AFPM) motor including: a stator including a stator core, a magnet wire wound around the stator core, a shaft, and a stator core supporting member fixedly supporting the stator core to the shaft; and a rotor including a rotor case having a space part formed therein so as to receive the stator core therein, a magnet fixedly coupled to an inner side portion of the rotor case so as to face the stator core, and a bearing rotatably supporting the rotor case to the shaft.
    Type: Application
    Filed: July 5, 2012
    Publication date: October 31, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Sang Jong LEE, Han Kyung BAE, Hee Soo YOON, Su Bong JANG
  • Publication number: 20130270928
    Abstract: A stator core section for a stator of a modulated pole machine, the modulated pole machine including the stator, a moving device, and an active gap between respective interface surfaces of the moving device and the stator for communicating magnetic flux between the stator and the moving device, the moving device being adapted to move relative to the stator in a direction of motion, wherein the stator core section includes a stator core back from which a plurality of teeth extend, each tooth extending in a respective first direction defining a direction towards the rotor, the teeth being arranged along a second direction defining the direction of motion, each tooth having at least one side wall facing a neighbouring tooth and an interface surface facing the active gap, the interface surface and the side wall forming an edge connecting the interface surface and the side wall.
    Type: Application
    Filed: December 20, 2011
    Publication date: October 17, 2013
    Applicant: HÕGANÃS AB (PUBL)
    Inventor: Göran Nord
  • Publication number: 20130264893
    Abstract: Disclosed is a stator device adapted to be arranged in an electrical machine, where the electrical machine further includes a moving device, where the stator device is a multi-phase stator device, where the phases are arranged side-by-side in a direction perpendicular to direction of motion of the moving device, and where each phase comprises a first stator core section having a set of teeth, a second stator core section having a set of teeth, and a coil, and where the teeth are arranged to protrude towards the moving device; and wherein at least two neighboring phases share a stator core section, so that the first stator core section of a first phase and a second stator core section of a second phase is formed as a single unit.
    Type: Application
    Filed: April 12, 2013
    Publication date: October 10, 2013
    Applicant: HOGANAS AB (PUBL)
    Inventors: GLYNN JAMES ATKINSON, ALAN G. JACK, BARRIE MECROW
  • Publication number: 20130264894
    Abstract: An amorphous magnetic component for use in a high-power, high-speed electric motor, in which amorphous metal materials are powdered, compressed, and molded, to be easily molded into magnetic components of a complex shape, and crystalline metal powder of excellent soft magnetic properties is added to the amorphous alloy powder, to promote improvement of a magnetic permeability and improvement of a packing density at the time of compression molding. A method of manufacturing the amorphous magnetic component; includes the steps of: pulverizing ribbons or strips of amorphous alloys to obtain plate-shaped amorphous alloy powder; classifying the amorphous alloy powder, and mixing the amorphous alloy powder with spherical soft magnetic powder, in order to improve magnetic permeability and packing density, to obtain mixed powder; mixing the mixed powder with a binder, to be molded into a shape of the magnetic components; and sintering the molded magnetic components to implement magnetic properties.
    Type: Application
    Filed: May 31, 2013
    Publication date: October 10, 2013
    Applicant: AMOTECH CO., LTD.
    Inventor: Byoung Soo KIM
  • Publication number: 20130257186
    Abstract: Magnets and methods of their manufacture are disclosed for use in flywheel assemblies, such that the magnets comprise oriented fibers, such as, for example, axially-oriented fibers in a flexible rotor magnet composition to predictably allow the magnet to expand dimensionally upon rotation only in a predetermined and predictable fashion while maintaining critical contact with a rotor surface.
    Type: Application
    Filed: April 3, 2012
    Publication date: October 3, 2013
    Applicant: THE BOEING COMPANY
    Inventors: Michael P. Kozar, John R. Hull, John A. Mittleider, Mark S. Wilenski
  • Publication number: 20130234540
    Abstract: This DC brushless motor (1) is provided with a stator (2) that has exciting coils (31, 32) and a rotor (4) that is positioned coaxially to the stator (2). The stator (2) has a quasi-E-shaped cross-section in the axial direction at the radius part; a plurality of protrusions (212, 222, 232) serving as magnetic poles are formed on the respective 3 parallel sections (211, 221, 231) of the E in the same number in the circumferential direction; and of the magnetic poles (212, 222, 232) formed at the 3 parallel sections (211, 221, 231) of the E, the top and the bottom magnetic poles (212, 232) are respectively positioned so as to be shifted in the opposite directions in the circumferential direction with respect to the center line of the middle magnetic pole (222). Changes in the magnetic resistance between the stator (2) and the rotor (4), which are caused by the flow of a magnetic flux generated around the exciting coils (31, 32), are utilized as a driving force.
    Type: Application
    Filed: November 18, 2011
    Publication date: September 12, 2013
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD)
    Inventors: Akira Tsutsui, Kenichi Inoue, Lyoji Zaitsu
  • Publication number: 20130221771
    Abstract: A hybrid excitation machine comprising a rotor having first and second rotor cores with a gap between in an axial direction, wherein first magnetic poles excited by a permanent magnet and second magnetic poles not excited by the permanent magnet are alternately arranged in a circumferential direction in each rotor core. The first magnetic poles of the first and second rotor cores have different polarities, and the first magnetic poles of one rotor, core face the second magnetic poles of the other rotor core in the axial direction. A stator generating a magnetic field rotating the motor is placed radially outward of the rotor and an exciting coil exciting the second magnetic poles is placed in the gap, wherein the stator has, in the axial direction, first stator cores on both sides and a second stator core having lower magnetic resistance than the first stator core, in a center.
    Type: Application
    Filed: February 1, 2013
    Publication date: August 29, 2013
    Inventors: Katsuichi KONO, Junichi YOKOTA, Ken TAKEDA
  • Publication number: 20130187485
    Abstract: In a rotating electrical machine of radial-gap type, a radial core, having number of winding slots of “m”, is constructed as an integral compacting type by compacted powder or as a split compacting type with compacted powder. The radial core has a thickness in an axial direction of winding thereof so as to become thinner toward outward from a central portion thereof, in which the “m” is integer number in a range of 4 to 12.
    Type: Application
    Filed: December 5, 2012
    Publication date: July 25, 2013
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventor: NIPPON PISTON RING CO., LTD.
  • Publication number: 20130187488
    Abstract: In a rotating electrical machine of axial-gap type in which a stator and a rotor are opposed to each other in arrangement and winding axis is parallel with a rotating shaft direction, the stator has an “m” protruding in the rotating shaft direction are distributed along a circumferential direction thereof, in which the winding pole is formed of a magnetic member having a plurality of teeth in a circular-arc shape in a diameter direction, and wherein the rotor is formed of a magnetic member having a plurality of teeth in a circular-arc shape in a diameter direction, and the number of the teeth of the stator and the rotor are arranged in a manner opposite to each other through air gap so as to be engaged with each other. The stator and the rotor are opposed on both sides of the rotor and the stator.
    Type: Application
    Filed: December 19, 2012
    Publication date: July 25, 2013
    Applicant: NIPPON PISTON RING CO., LTD.
    Inventor: NIPPON PISTON RING CO., LTD
  • Publication number: 20130181551
    Abstract: A permanent magnet machine is provided including a stator and a rotor, the rotor being adapted to rotate relative to the stator, the rotor including a plurality of permanent magnets separated in the circumferential direction from each other by radially extending rotor pole pieces for concentrating the magnetic flux from the permanent magnets, the stator having a structure that defines radial limits of an air gap between the stator and the rotor for communicating magnetic flux between the stator and the rotor, wherein at least some of the permanent magnets extend radially outside the radial limits of the air gap as defined by the stator structure.
    Type: Application
    Filed: December 11, 2012
    Publication date: July 18, 2013
    Applicant: HOGANAS AB (PUBL)
    Inventor: HOGANAS AB (PUBL)
  • Publication number: 20130162064
    Abstract: Disclosed herein is a laminated core used for a motor such as an electric motor, including: a unit laminate laminated in at least one layer and formed of a soft magnetic composite, wherein each powder particle forming the soft magnetic composite is insulation-coated. The preferred embodiments of the present invention can improve the mechanical strength of the core of the soft magnetic composite by manufacturing the core using the laminating method of the soft magnetic composite and reduce core loss by performing insulation coating on powder particles forming the soft magnetic composite.
    Type: Application
    Filed: February 29, 2012
    Publication date: June 27, 2013
    Applicant: SAMSUNG ELECTRO-MECHANICS CO., LTD.
    Inventors: Changsung Sean Kim, Guen Hong Lee, Han Kyung Bae, Chang Hwan Choi, Ji Hye Shim