With Pole Shoes Patents (Class 310/156.33)
  • Patent number: 8710711
    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: Grant
    Filed: December 11, 2012
    Date of Patent: April 29, 2014
    Assignee: Hoganas AB (Publ)
    Inventors: Lars-Olov Pennander, Alan G Jack, Glynn James Atkinson
  • Patent number: 8508092
    Abstract: A rotor for an electrical motor includes a spindle, a plurality of sintered permanent magnets arranged around the spindle, a compacted powdered soft magnetic material at least partially surrounding the plurality of sintered permanent magnets, and a plurality of discrete regions of compacted powdered non-magnetic material at least partially surrounding the plurality of sintered permanent magnets. The discrete regions of non-magnetic material are at least partially embedded in the soft magnetic material and the soft magnetic material and the non-magnetic material couple the plurality of sintered permanent magnets with the spindle.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: August 13, 2013
    Assignee: Toyota Motor Engineering & Manufacturing North America, Inc.
    Inventors: Scott Michael Ankeney, Kenji Nakamura
  • Publication number: 20130181565
    Abstract: A method, apparatus, article of manufacture and system for producing a field pole member for electrodynamic machinery are disclosed to, among other things, reduce magnetic flux path lengths and to eliminate back-iron for increasing torque and/or efficiency per unit size (or unit weight) and for reducing manufacturing costs. For example, a field pole member structure can either reduce the length of magnetic flux paths or substantially straighten those paths through the field pole members, or both. In one embodiment, a method provides for the construction of field pole members for electrodynamic machines.
    Type: Application
    Filed: October 8, 2012
    Publication date: July 18, 2013
    Applicant: NovaTorque, Inc.
    Inventor: NovaTorque, Inc.
  • Patent number: 8283829
    Abstract: There is provided an axial gap motor including a rotor rotatable around a rotation axis; and a first stator and a second stator arranged to face each other with the rotor therebetween from both sides of the rotor in the rotation axis direction of the rotor, wherein the rotor includes a plurality of main permanent magnets having magnetizing directions in the rotation axis direction of the rotor and arranged in a peripheral direction of the rotor; a partition member arranged between the main permanent magnets which are adjacent to each other in the peripheral direction of the rotor, the partition member including a nonmagnetic material; and auxiliary permanent magnets having a magnetizing direction that is orthogonal both to the rotation axis direction of the rotor and a radial direction of the rotor, and arranged on both sides of the partition member in the rotation axis direction of the rotor.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: October 9, 2012
    Assignee: Honda Motor Co., Ltd.
    Inventors: Keiichi Yamamoto, Hirofumi Atarashi, Shoei Abe
  • Patent number: 8177530
    Abstract: A miniature heat-dissipating fan includes a stator and a rotor. The stator has a first leakage flux absorber, a coil layer arranged on the first leakage flux absorber, and a hole. The coil layer has a plurality of coils, and the hole passes through the first leakage flux absorber and the coil layer. The rotor has an impeller, a second leakage flux absorber and a permanent magnet. The second leakage flux absorber and the permanent magnet are attached to a bottom of the impeller, such that the rotor is rotatably coupled to the stator. Consequently, magnetic flux leakage under the stator is prevented to assure that electromagnetic interference will never be caused, and an overall axial thickness of the miniature heat-dissipating fan is reduced by the configuration of the stator.
    Type: Grant
    Filed: November 17, 2008
    Date of Patent: May 15, 2012
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Tso-Kuo Yin
  • Patent number: 8084900
    Abstract: A stater of an electrical machine has a cross section, a longitudinal extension, a jacket surface, a plurality of winding holders configured so that at least one of the winding holders for receiving a field winding has a larger winding width than another of the winding holders.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: December 27, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Ludwig Schoen, Florian Esenwein
  • Patent number: 8072107
    Abstract: The present disclosure relates generally to a permanent magnet, brushless motor comprising a primary rotor having alternating magnetic poles around a circumference, a secondary rotor similar to the primary rotor. The primary rotor may be free to rotate by approximately plus or minus one pole of the secondary rotor. As such, when the two rotor components have opposite polarities aligned, the motor may be in a field weakened state. Generally, the field weakened state may be the normal state of the motor. As a significant load is encountered, the rotors may automatically transition to a non-weakened state wherein similar polarities are aligned on the rotors. A permanent magnet, brushless motor as described herein may be employed at a motor level or integrated into a linear actuator, wherein the rotor of the permanent magnet, brushless motor may include a hollow shaft.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: December 6, 2011
    Assignee: Creative Motion Control, Inc
    Inventors: Keith Hochhalter, Mike Seiler
  • Patent number: 8058762
    Abstract: A technique of employing a rotor having anti-saliency and being rotatable about a predetermined axis in an axial gap type motor is provided. A plurality of magnets are disposed annularly on a substrate with polarities being symmetric around a shaft hole. For instance, the magnets exhibit N pole and S pole, respectively, on the side of a stator (on this side of sheet of drawing). A plurality of magnetic members are disposed to extend perpendicularly to the direction of a rotation axis, and more specifically, between the magnets.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: November 15, 2011
    Assignee: Daikin Industries, Ltd.
    Inventor: Yoshinari Asano
  • Patent number: 8026648
    Abstract: An electric machine, especially a brushless DC motor. Said electric machine comprises a rotor and a stator which is provided with current-carrying coils. Said rotor, in the circumferential direction, is provided with a plurality of permanent magnets that are embedded in respective magnet retainers between the peripheral surface and the shaft of the rotor in such a manner that the permanent magnets, in the radial direction, are completely encircled by the peripheral surface of the rotor. In the area of the magnet retainer, recesses extend laterally in the circumferential direction of the rotor and axially within the rotor.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: September 27, 2011
    Assignee: BSH Bosch und Siemens Hausgeraete GmbH
    Inventors: Falko Abel, Michal Kalavsky, Pietro de Filippis
  • Patent number: 7972450
    Abstract: A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.
    Type: Grant
    Filed: February 19, 2010
    Date of Patent: July 5, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Matahiro Komuro, Yuichi Satsu, Takao Imagawa
  • Patent number: 7932658
    Abstract: An electric machine includes a stator, and a rotor positioned adjacent the stator and configured to rotate with respect to the stator. The rotor includes a plurality of laminations having an outside diameter and stacked in a stackwise direction. Each lamination includes a plurality of non-linear slots positioned inward of the outside diameter. Each non-linear slot includes an inner portion spaced a first distance from the outside diameter and two end portions disposed a second distance from the outside diameter. The second distance is smaller than the first distance. The rotor also includes a plurality of permanent magnets. Each magnet is disposed in one of the non-linear slots.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: April 26, 2011
    Assignee: A.O. Smith Corporation
    Inventor: Dan M. Ionel
  • Patent number: 7876012
    Abstract: A dynamoelectric machine comprising a stator having a plurality of slots and teeth, armature windings wound around the teeth, and a rotor disposed inside the stator, wherein an alloy member is disposed in the inner periphery of the stator and the magnetic compensator has its surface or inside thereof a high resistance layer.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: January 25, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Matahiro Komuro, Yuichi Satsu, Noriaki Hino
  • Publication number: 20100187933
    Abstract: There is provided an axial gap motor including a rotor rotatable around a rotation axis; and a first stator and a second stator arranged to face each other with the rotor therebetween from both sides of the rotor in the rotation axis direction of the rotor, wherein the rotor includes a plurality of main permanent magnets having magnetizing directions in the rotation axis direction of the rotor and arranged in a peripheral direction of the rotor; a partition member arranged between the main permanent magnets which are adjacent to each other in the peripheral direction of the rotor, the partition member including a nonmagnetic material; and auxiliary permanent magnets having a magnetizing direction that is orthogonal both to the rotation axis direction of the rotor and a radial direction of the rotor, and arranged on both sides of the partition member in the rotation axis direction of the rotor.
    Type: Application
    Filed: June 11, 2008
    Publication date: July 29, 2010
    Applicant: HONDA MOTOR CO., LTD.
    Inventors: Keiichi Yamamoto, Hirofumi Atarashi, Shoei Abe
  • Patent number: 7737583
    Abstract: A rotor assembly comprising: an inner rotor and an outer rotor for rotating in a magnetic field of a motor, the inner rotor comprising a main inner rotor cavity, and a plurality of first holes being formed between the inner rotor and the outer rotor; two side boards, each side board having a main side board cavity, and being perforated by a plurality of second holes; two damping elements each damping element comprising a main damping element cavity; a plurality of rubber sleeves, each rubber sleeve having a rubber sleeve lip; and a plurality of third holes; an axle; and a plurality of positioning pins.
    Type: Grant
    Filed: August 3, 2008
    Date of Patent: June 15, 2010
    Assignee: Zhongshan Broad-Ocean Motor Co., Ltd.
    Inventor: Ronghua Bi
  • Patent number: 7592733
    Abstract: A rotary electric machine includes a stator including a plurality of teeth which are each wound up by a coil and a stator yoke core connecting the respective teeth, and a rotor provided with magnets disposed so as to oppose to the teeth, respectively, with a space therebetween. Each of the teeth has a surface opposing to the magnet of the rotor, and the opposing surface is formed with a protruded portion at substantially central portion thereof in the circumferential direction of the stator.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: September 22, 2009
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shinya Naitou, Haruyoshi Hino
  • Publication number: 20090218902
    Abstract: Embodiments of actuators (20) comprise an electromagnetically conductive housing (22); a rotor (24); a first stationary pole member (48); a second stationary pole member (42); a first permanent magnet (44) connected to the first pole member (48); a second permanent magnet (46) connected to the first pole member (48); and; an electrically conductive coil (40) situated within the housing (22) and configured to define a cavity. The rotor (24) comprises a rotor shaft (26) and a rotor flange (28). The rotor flange (28) comprises both a first flange segment (56) and a second flange segment (58) which extend in different radial directions relative to the rotor shaft (26).
    Type: Application
    Filed: March 3, 2009
    Publication date: September 3, 2009
    Inventor: David B. MOHLER
  • Patent number: 7567004
    Abstract: A motor-generator system with a current control feedback loop for generating electrical energy in stationary, portable, and automotive applications. The generator includes a housing defining an interior space and including a first portion and a second portion; an electric motor assembly positioned within the first portion of the housing, and operationally coupled to a shaft member for selectively rotating the shaft member; an electric generator assembly positioned within the second portion of the housing and operationally coupled to the shaft member for converting mechanical rotation into electrical energy, the electric generator assembly including a current output for supplying electrical current; and a control assembly operationally coupled between the electric generator assembly and the electric motor assembly the control assembly providing a control current to the electric motor assembly for controlling a speed of rotation induced into the shaft member by the electric motor assembly.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: July 28, 2009
    Inventor: Raymond W. Smith
  • Publication number: 20090127963
    Abstract: An electric motor comprising a rotor, a stator and a field weakening device. The rotor has a plurality of magnets mounted thereto, and the stator is located adjacent to the rotor and has a plurality of slots defined therein. The slots define raised teeth and are wound with electrical wiring to generate a magnetic field when the wiring is energized with current. The field weakening device is made from a highly magnetically permeable material and a comparatively lower magnetically permeable material. The field weakening device is disposed between the rotor and the stator and is selectively movable between a first position to align the highly magnetically permeable material between the teeth of the stator and the magnets of the rotor and a second position to align the comparatively lower magnetically permeable material between the teeth of the stator and the magnets of the rotor.
    Type: Application
    Filed: February 12, 2007
    Publication date: May 21, 2009
    Applicant: THE TIMKEN COMPANY
    Inventors: Xiaolan Ai, Bradley Mularcik, Richard Knepper
  • Patent number: 7173357
    Abstract: There is provided an axial gap type rotating electric machine which is small-sized and achieves a high motor efficiency as a drive source having a high torque using, for example, a strong magnet by reducing an energy loss by an induced current.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: February 6, 2007
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shinya Naito, Haruyoshi Hino
  • Patent number: 7126309
    Abstract: The electric machine of the present invention comprises a first coil group containing a plurality of coils and a magnet group. The first coil group is classified into M phase sub coil groups, with the coils of the sub coil groups aligned one at a time in sequence at a specified sub coil group interval Dc from the first phase sub coil group to the M-th phase sub coil group. A sub coil group interval Dc is set to a value of K/M times a magnetic pole pitch Pm (K is a positive integer excluding an integral multiple of M) where the distance corresponding to an electrical angle of ? is defined as the magnetic pole pitch Pm. The adjacent sub coil groups are driven at a (K/M)? phase difference. Each coil have substantially no magnetic material core.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: October 24, 2006
    Assignee: Seiko Epson Corporation
    Inventors: Kesatoshi Takeuchi, Takahiro Sagawa
  • Patent number: 6455969
    Abstract: A single-stator-double-rotor rotating motor has one upper-layer rotor, one intermediate-layer armature and one lower-layer rotor. The upper-layer rotor and lower-layer rotor are embedded with the same number of magnets to form a magneto type magnetic pole, stator electrodes of the same number as the number of magnets are disposed on the intermediate-layer armature to form an electro type magnetic pole. A skew symmetry exists between an upper-layer rotor and a corresponding lower-layer rotor, and the upper-layer rotor and the lower-layer rotor are rotated in opposite directions by commutation of the current flowing through exciting coils of the stator electrodes every T/N of time, wherein T is a rotation period of the upper-layer rotor, and N is the number of the magnets.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: September 24, 2002
    Assignee: Chung-Shan Institute of Science & Technology
    Inventor: Ping-Ho Chen
  • Publication number: 20010033118
    Abstract: A rotor for an electric rotary machine having signal generating inductor magnetic poles provided on a periphery thereof comprising a cup-like rotor yoke having a peripheral wall and a bottom wall and an inductor forming member mounted on the peripheral wall of the cup-like yoke and including a ring-like portion fitted onto the peripheral wall of the rotor yoke and having the inductor magnetic poles formed thereon and securely mounted on the rotor yoke by forcing protrusions formed on the peripheral wall of the rotor yoke against the both axial ends of the ring-like portion.
    Type: Application
    Filed: April 17, 2001
    Publication date: October 25, 2001
    Inventors: Takahiro Osada, Yoshimasa Serisawa