With Plural Diverse Pole Shapes Patents (Class 310/216.073)
  • Patent number: 8975799
    Abstract: A broad-pole type square-wave three-phase brushless permanent magnet direct current motor and an assembling method thereof are disclosed. The number of magnetic poles on a rotor core is: 2P=4. The number of slots in a stator core is: Z=6. Six teeth on the stator are composed of three large teeth and three small teeth. The sum of mechanical angels of one large tooth and one small tooth is 120 degree. Electrical angles corresponding to the mechanical angles are: P* 120=240° . Three-phase concentrated windings are wound on three large teeth separately, and only one winding is arranged at each phase. The advantages of the motor are low positioning torque, simple structure, effective production cost, convenient to wind the windings, and low copper loss, etc.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: March 10, 2015
    Assignee: Shenzhen A&E Servo Motor Technology Co., Ltd.
    Inventors: Yamei Qi, Tiecai Li, Zhaoyong Zhou, Weilong Lan, Zhihui Liao, Shinian Li
  • Patent number: 8816562
    Abstract: A stator for an electric rotating machine includes a stator core that has slots, a stator coil, and an impregnant applied to the inner surface of the stator core. The stator core has a plurality of teeth that divide the slots. Teeth having chamfered surfaces between a projected tip surface and each side surface of the teeth and teeth without chamfered surfaces are intermingled. At least one bent corner part formed at an end of the projected tip surface of the teeth is formed in an arcuate surface. A relationship (R1>R2) is satisfied, where R1 represents a curvature radius of arcuate surfaces formed in the curved corner part where the projected tip surface and the chamfered surface abut and R2 represents a curvature radius of the arcuate surfaces formed in the curved corner part where the projected tip surface and the side surface abut.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: August 26, 2014
    Assignee: Denso Corporation
    Inventors: Shigenori Yoneda, Toshiaki Oohara
  • Patent number: 8766506
    Abstract: A stator core includes a cylindrical yoke and teeth that are disposed in an inner circumference surface of the yoke along its circumferential direction and that are subjected to magnetic flux from the rotor of the rotating electrical device. The teeth include a trapezoidal tooth that has a trapezoidal cross section that is taken vertically along a central axis of the yoke and an oddly shaped tooth of which a tip section has the same shape as the trapezoidal tooth and a base section from the tip section to the yoke has a different shape from the trapezoidal tooth.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: July 1, 2014
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
    Inventors: Shinya Sano, Isao Kato
  • Patent number: 8622722
    Abstract: A fuel pump, for an internal combustion engine, has a housing accommodating a pump and a motor. The motor is arranged to drive the pump so as to pump fuel through the housing. The motor has a wound stator having a plurality of inwardly directed teeth about which a stator winding is wound, and a radially outer surface in contact with an inner surface of the housing. One or more pathways are formed between the inner surface of the housing and the outer surface of the stator, for the flow of fuel there through. Each pathway is formed by an axially extending recess formed in the outer surface of the stator and aligned with a selected tooth of the stator.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: January 7, 2014
    Assignee: Johnson Electric S.A.
    Inventors: Yong Bin Li, Wei Feng Yuan, Ning Sun, Xin Ping Wang
  • Patent number: 8569924
    Abstract: A rotating electric machine includes a case, a plurality of teeth, coils and insulating films. The teeth are circumferentially arranged around a predetermined axis forming a center of the teeth. Each tooth has a first end disposed radially at an opposite side thereof from the predetermined axis. The a back yoke has a circular outer periphery, and a cylindrical inner periphery connecting the first ends of the teeth. The outer periphery has a plurality of concave parts opening radially inwardly toward the teeth at positions overlapping with the teeth as viewed radially. A minimum distance measured from an exposure surface of each tooth to the concave part overlapping therewith is smaller than a radial width of the back yoke at a portion where the concave parts are not provided. The exposure surfaces extend radially inwardly of the inner periphery.
    Type: Grant
    Filed: April 23, 2008
    Date of Patent: October 29, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Yoshiki Yasuda, Akio Yamagiwa
  • Patent number: 8482179
    Abstract: A brushless motor includes: a stator assembly including a stator core which includes a plurality of pole teeth each having a winding therearound; and a rotor assembly including a magnet which has a ring shape, is rotatably disposed so as to oppose the pole teeth of the stator core and which is circumferentially magnetized with a plurality of magnetic poles with opposite polarities alternating with each other, wherein the number of the pole teeth of the stator core is twice the number of the magnetic poles of the magnet such that each magnetic pole opposes a pair of adjacent pole teeth, one pair of adjacent windings have the same number of winding turns and the same winding direction as each other, and wherein another pair of windings located next to the one pair of windings have a winding direction opposite to the winding direction of the one pair of windings.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: July 9, 2013
    Assignee: Minebea Co., Ltd.
    Inventors: Manabu Nakamura, Yuzuru Suzuki, Hiroyuki Furusaki
  • Patent number: 8350434
    Abstract: For providing a permanent magnet type rotary electric machine that can reduce magnetic fluxes concentrated to one side in rotating direction on a magnetic pole circumferential face that causes torque ripple as well as ensure the mechanical strength, in the present invention, an outer circumference of respective magnetic poles is formed in a circular arc having a same curvature as well as the magnetic pole center axes of the respective magnetic poles are displaced with respect to the rotation center of a rotor so that an air gap between a stator and the respective magnetic pole outer circumferences at one side in the rotating direction is widened in comparison with the air gap at the other side.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: January 8, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Hori, Daisuke Kori, Akiyoshi Komura
  • Patent number: 8274182
    Abstract: A linear motor includes a stator having field poles arranged linearly with opposing polarities arranged in an alternating manner; and a rotor having an armature core with teeth that faces a pole face of the field poles with a gap, and coils wound around the teeth. The stator and the rotor are supported in a slidable manner, a direction perpendicular to a sliding direction of the rotor and in parallel with the pole face is defined as a stacking direction. A head of each of the teeth has an extended portion extended in the sliding direction. At least heads of the teeth arranged at both ends of the armature core along the sliding direction is divided into a plurality of areas along the stacking direction. At least one of extended portions arranged on adjacent areas is extended by a different length along the sliding direction.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: September 25, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Misa Nakayama, Shinichi Yamaguchi, Koki Naka, Kazumasa Ito, Toshinori Tanaka
  • Patent number: 8222790
    Abstract: There are provided a tubular stator core having a plurality of tooth portions which protrude radially inwards and slots which are defined between the respective tooth portions and coils which are disposed on circumferences of the tooth portions. An insulator is attached to the stator core from an axial direction thereof for isolating the coils from the stator core. A radius of curvature of a corner portion of the insulator around which the coil is wound decreases continuously as the tooth portion extends from a root portion to a distal portion thereof.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: July 17, 2012
    Assignee: JTEKT Corporation
    Inventor: Takatoshi Sakata
  • Patent number: 8102093
    Abstract: A polyphase motor, for example for applications for driving pumps or ventilators in the automobile industry, including a stator part excited by electric coils and a rotor exhibiting N pairs of poles that are magnetized radially in alternate senses, the stator part exhibiting wide teeth and narrow teeth extending radially from an annular ring. The wide teeth carry the coil windings and the distance between a wide tooth and a narrow tooth is greater than the width of a narrow tooth.
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: January 24, 2012
    Assignee: Moving Magnet Technologies (MMT)
    Inventor: Daniel Prudham
  • Patent number: 8089192
    Abstract: This invention relates to a three-phase square-wave permanent magnet brushless DC motor for solving problems of the existing square-wave permanent Magnet Motor and sine-wave permanent magnet motor. In this invention, the number 2P of magnetic poles on the said rotor core is 8; the slot number Z of the said stator core is 12, accordingly there are 12 teeth, including three big teeth, three medium teeth and six small teeth; the ratio of their mechanical angles is 50° (±5°) for big teeth: 40° (±5°) for medium teeth: 15° (±5°) for small teeth, and the sum of the mechanical angles of one big tooth, one medium tooth and two small teeth must be 120°. Three-phase concentrated windings are respectively wound on the big teeth and the medium teeth, in which there are only two concentrated windings for each phase, thus there are only 6 concentrated windings for the three-phase motor.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: January 3, 2012
    Assignee: Shenzhen Academy of Aerospace Technology
    Inventors: Tiecai Li, Yamei Qi, Zhaoyong Zhou, Xiang Kong, Weilong Lan, Feipeng Xu
  • Patent number: 8022587
    Abstract: Electric machines which are excited with permanent magnets are to be improved in terms of their smoothness of operation and their loss properties. For this purpose, an electric machine is proposed comprising a first active part (40) on which one electric magnet (41, 42) and at least one permanent magnet (44) are mounted, and a second active part (43) which has a multiplicity of pole teeth (45, 46) and which interacts magnetically with the first active part (40). The pole teeth (45, 46) are spaced apart from one another in a non-uniform fashion in the direction (3) of the movement of the electric machine and/or have different average widths from one another, with the respective width of a tooth being measured in the direction (3) of movement and being averaged in terms of the extent of the tooth in the transverse direction with respect to the direction of travel. The geometry of the tooth causes the harmonics of the magnetic field to be influenced in a selective fashion.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: September 20, 2011
    Assignee: Siemens Aktiengesellschaft
    Inventor: Thomas Hoppe
  • Patent number: 8022588
    Abstract: It is an object to obtain a highly efficient and low-cost single-phase motor by producing the motor in a form that allows a proper material layout, with securing a magnetic path of a coreback of a stator iron core.
    Type: Grant
    Filed: March 30, 2006
    Date of Patent: September 20, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hayato Yoshino, Yoshio Takita, Koji Yabe, Tomoaki Oikawa, Takahiro Tsutsumi
  • Patent number: 7969058
    Abstract: Permanent magnet motors with improved torque ripple and methods for designing the same have been provided. The permanent magnet motor can include a stator having a hollow core and defining a plurality of slots; a winding disposed in each of the slots; a rotor rotatably disposed inside the hollow core of the stator; and a plurality of permanent magnets supported by the rotor. Each of the slots has a slot opening, and at least one of the slot openings can be off-center with respect to the respective slot.
    Type: Grant
    Filed: June 7, 2007
    Date of Patent: June 28, 2011
    Assignee: GM Global Technology Operations LLC
    Inventors: Khwaja M. Rahman, Peter J. Savagian, Matthew D. Laba
  • Patent number: 7960889
    Abstract: A first laminated body includes first and second laminated groups including respective convex parts alternately disposed. A second laminated body includes third and fourth laminated groups including respective concave parts alternately disposed. The convex part of the first laminated group is shaped to not be inserted into the concave part of the third laminated group and to be inserted into the concave part of the fourth laminated group, from a lamination horizontal direction. The convex part of the second laminated group is shaped to be inserted into the concave part of the third laminated group and the concave part of the fourth laminated group, from the lamination horizontal direction. The convex part of the first laminated group is press-inserted in the concave part of the third laminated group, and the convex part of the second laminated group is inserted in the concave part of the fourth laminated group.
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: June 14, 2011
    Assignee: Mitsubishi Electronic Corporation
    Inventor: Kazuyuki Yamamoto
  • Publication number: 20110050028
    Abstract: The invention relates to an electrical machine with a stator (1) and a rotor (2), it being possible for the rotor (2) to be moved in rotary fashion with respect to the stator (1), and the stator (1) having slots (4), in which conductor loops (6) of a winding for electrically inducing a magnetic field are arranged, and the rotor (1) having slots (7), in which conductor loops (9) of a winding or cage bars (9) are arranged. Against this background, the invention specifies an electrical machine in which the disruptive noise emission can be reduced significantly whilst maintaining approximately the same performance data for the machine. For this purpose, provision is made for the slots (4, 7) of the stator and/or of the rotor to be spaced apart from one another nonuniformly over the circumference of the stator (1) or the rotor (2). Furthermore the invention specifies a process for manufacturing such an electrical machine.
    Type: Application
    Filed: August 26, 2010
    Publication date: March 3, 2011
    Inventor: Bernd Ponick
  • Patent number: 7898139
    Abstract: A magnetic actuator, comprising, an inner ring, an outer ring disposed around the inner ring, a first pair of inner teeth disposed on the inner ring that partially define a gap between the first pair of inner teeth having a first angular dimension, a second pair of inner teeth disposed on the inner ring that partially define a gap between the second pair of inner teeth having a second angular dimension, a first pair of outer teeth disposed on the outer ring that partially define a gap between the first pair of outer teeth having a third angular dimension and a second pair of outer teeth disposed on the outer ring that partially define a gap between the second pair of outer teeth having a fourth angular dimension.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: March 1, 2011
    Inventors: Mohammad S. Islam, Joel E. Birsching, Tomy Sebastian
  • Patent number: 7893575
    Abstract: The depth from the open end of a rotor slot closest to a magnetic pole of a rotary core to a slot bottom or the bottom of a subslot provided as a coolant ventilation path on a rotor slot bottom is made less than the depth of slots at and after a second slot counted from the magnetic pole side in the direction of internal circumference, and when a shortest distance between the bottoms of the rotor slots opposed to each other through a magnetic pole or a shortest distance between the bottoms of the subslots is assumed to be a magnetic pole width of the slots, a magnetic pole width Wp1 of a slot closest to the magnetic pole side is set to 85% or more of a magnetic pole width Wp2 of a second slot counted from the magnetic pole side in the direction of internal circumference.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: February 22, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masafumi Fujita, Tadashi Tokumasu, Yasuo Kabata, Mikio Kakiuchi, Masanori Arata, Takashi Ueda
  • Patent number: 7816836
    Abstract: A reduced stress rotor tip fillet that may be utilized in generators and motors as well as other types of rotating equipment is disclosed herein. The rotor tip fillet may reduce stress via an inventive fillet configuration positioned between intersecting rotor faces.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: October 19, 2010
    Assignee: Honeywell International Inc.
    Inventor: Dwayne E Burnett
  • Publication number: 20100253176
    Abstract: Arrangement at an electric machine, particularly motor, generator, or actuator, with a stator with teeth (11, 12) carrying coils (15), particularly one layer, for concentrated windings. A permanent magnetic rotor is movable relatively to the stator (11, 12). The teeth of the stator are arranged for receiving coils (15) with generally rectangular opening. Advantages are achieved if the stator teeth (11, 12) are provided to receive generally identical coils (15) closing the grooves (14, 16). The teeth (11, 12) may be alternating rectangular and converging/diverging toward the top, to provide grooves (14, 16), with parallel sides to enter the coils (15). The converging teeth (22) have preferably a shortened top (23). The grooves are preferably provided to make room for a semi magnetic groove wedge (17, 18) between adjacent teeth.
    Type: Application
    Filed: February 8, 2007
    Publication date: October 7, 2010
    Applicant: SMARTMOTOR AS
    Inventors: Sigurd Ovrebo, Fredrik Idland, Edgar Lovli
  • Patent number: 7646131
    Abstract: According to the invention, an improved copper filling in the slots (4) of a permanently-stimulated synchronous motor (2) may be achieved, whereby such a motor is disclosed, comprising a stator (1), with parallel-edged slots (4), provided with a winding system of flat wires (5), whereby the flat wires (5) each enclose a tooth (3) and are embodied as a tooth coil (6). The flat wires (5) are wound edgewise such that the narrower side of the flat wire (5) faces the tooth (3) and each tooth coil (6) comprises at least two layers of flat wires (5).
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: January 12, 2010
    Assignee: Siemens Aktiengesellschaft
    Inventors: Klaus Georg, Holger Schunk, Albrecht Storath