Laminated Pole Shoes With Single Pole Pair Patents (Class 310/156.52)
  • Patent number: 10305337
    Abstract: A permanent magnet type rotating electric machine includes a stator, a rotor core, and permanent magnets embedded in the rotor core. The permanent magnets include N-pole magnets, having N-poles opposed to the stator, and S-pole magnets, having S-poles opposed to the stator. The N-pole magnets are arranged adjacent to each other, and the S-pole magnets are arranged adjacent to each other. The outer circumferential portion of the rotor core includes a first N-pole corresponding section corresponding to an N-pole magnet that is not adjacent to an S-pole magnet and is partially wider in the radial direction than a second N-pole corresponding section that corresponds to an N-pole magnet that is adjacent to one of the S-pole magnets.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: May 28, 2019
    Inventors: Noriyuki Suzuki, Yoshiyuki Nakane
  • Patent number: 10164488
    Abstract: A brushless motor includes a stator disposed along an axis and a rotor disposed radially inward from the stator. The rotor includes a core, a plurality of first magnets and a plurality of second magnets configured to have opposite poles relative to the plurality of first magnets. The plurality of first and second magnets may each have a substantially rectangular cross-section and are in contact with a substantially flat surface carried by the core that faces radially outward.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: December 25, 2018
    Inventors: Mohammed R. Islam, Kenneth P. Webber, Delynn M. Streng, Christopher J. Sommer
  • Patent number: 8796897
    Abstract: In a motor, an armature is provided to be opposite to a rotor member for generating a rotating magnetic field. In the armature, plural sets of teeth are arranged in a direction of rotation of the rotor member such that each set of teeth in the plural sets of teeth is within one electrical angular cycle of the rotating magnetic field. The one electrical angular cycle corresponds to one pole-pair pitch of the annular rotor member. A number of teeth in the plurality of teeth within the one pole-pair pitch is set to 2k (k is a natural number), and a number of teeth facing each of the first magnetic poles in the plurality of teeth is set to be equal to or greater than the sum of k and 1.
    Type: Grant
    Filed: May 11, 2011
    Date of Patent: August 5, 2014
    Assignee: Denso Corporation
    Inventors: Makoto Taniguchi, Asuka Tanaka
  • Patent number: 8598760
    Abstract: A permanent magnet module for a rotor of a permanent magnet electrical machine is presented. The permanent magnet module comprises: a stack of ferromagnetic steel sheets (104) having a groove in the direction perpendicular to the ferromagnetic steel sheets, and a permanent magnet (105) located in the groove and arranged to produce magnetic flux that penetrates a surface (106) of the stack of ferromagnetic steel sheets. The surface has a shape suitable for forming a desired magnetic flux density distribution into an air-gap of the permanent magnet electrical machine. The permanent magnet module further comprises a base-plate (102) made of solid ferromagnetic steel. The base plate is located at an opening (116) of the groove and constitutes together with the groove an aperture in which the permanent magnet is located.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: December 3, 2013
    Assignee: The Switch Drive Systems Oy
    Inventor: Panu Kurronen
  • Patent number: 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: 7619342
    Abstract: The object of the invention is a rotor for an electrical machine (2) formed from layered sheets (5, 22) essentially perpendicular to the rotor's axis of rotation. According to the invention, the rotor comprises at least one first sheet pack (4) that is located close to the central axis of the rotor's revolution and has cavities essentially equal in width to the rotor poles on the side of the rotor's circumference, and at least one second sheet pack (20) that is fitted to the cavity in the first sheet pack and essentially extends to the rotor's circumference, forming the outer surface of the rotor pole. A space (21) extending to the rotor's outer circumference has been arranged between the first and second sheet pack into which permanent magnets (26) intended for the magnetization of the motor are fittable.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: November 17, 2009
    Assignee: ABB Oy
    Inventor: Jukka Malmberg
  • Patent number: 7362025
    Abstract: At each permanent magnet in a rotor of an IPM rotary electric machine, each of a pair of flux barriers respectively disposed adjoining circumferentially opposed side faces of the magnet is formed with a trench portion that extends farther from a circumferential face of the rotor than a position on a corresponding side face that is located farthest, on that side face, from the rotor circumferential face. This prevents part of a flow of magnetic flux, from the stator through the rotor, from being diverted to flow into the magnet. Increased torque or output power is thereby achieved.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: April 22, 2008
    Assignee: Denso Corporation
    Inventor: Ryosuke Utaka
  • Patent number: 6664688
    Abstract: To provide a rotor for a motor capable of effecting improved torque variation due to improvement in the induced voltage waveform and of effecting improved magnet torque in a permanent magnet type synchronous motor utilizing reluctance torque. A rotor 11 comprises a core 12 made of a ferromagnetic material, a given member of permanent magnets 14 are mounted in the outer surface of the core 12 circumferentially at equal intervals, and arrangement of the permanent magnets 14 is such that polarities N, S of the permanent magnets on the sides facing a stator are disposed alternately. Also, in the core 12 between the center axis of the core and the permanent magnets 14 are embedded arc-shaped permanent magnets 16 corresponding to the permanent magnets 14, respectively, and arrangement of the permanent magnets 14 is the same as that of the corresponding permanent magnets 16.
    Type: Grant
    Filed: August 9, 2002
    Date of Patent: December 16, 2003
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Shinya Naito, Haruyoshi Hino