Specific Pole Pitch Patents (Class 310/216.112)
  • Patent number: 10230280
    Abstract: A rotating electric machine includes: a stator 11 including a plurality of salient poles 13, and a plurality sets of three windings 31 for three phases wound around the plurality of salient poles 13, and a rotor 21. Lines 31a from one ends of the windings 31 for each of the three phases are connected in parallel, and lines 31b from the other ends of the windings 31 of each of the plurality of sets are connected at a neutral point. The number of turns of the winding 31 around a first area on each of the salient poles 13 is less than the number of turns of the winding 31 around a second area on the salient pole 13. The neutral points are arranged on one side of the windings 31 to follow the periphery of the stator 11.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: March 12, 2019
    Assignee: SUZUKI MOTOR CORPORATION
    Inventors: Junichiro Tanaka, Ryo Ito
  • Patent number: 8912704
    Abstract: A method and apparatus for reducing or eliminating the effects of torque ripple and cogging torque and otherwise improving performance in an electromechanical machine such as a motor or generator. The rotor and/or stator is conceptually sectionalized and the sections spaced apart by amount sufficient to alleviate deleterious aspects of cogging torque and torque ripple. Positioning of the stator teeth or rotor magnets is determined based on the calculated spacing. Conceptual sections may be formed as physically individual segments. Unwound teeth may be disposed in end spaces between sections occupying less than the entire area of the end space.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: December 16, 2014
    Assignee: Northern Power Systems, Inc.
    Inventors: Jeffrey K. Petter, Hector Hurtado
  • Publication number: 20140265701
    Abstract: A rotary electric machine includes: a rotor core in which one or more permanent magnets are provided; and a stator core disposed radially opposite to the rotor core, a plurality of slots being provided in the stator core. Coils are disposed in the slots of the stator core. Further, the number q of slots per pole per phase, which is a value obtained by dividing the number Ns of the slots by the number P of poles of the permanent magnets and the number m of phases of a voltage induced in the coils, is a fraction having an odd denominator and an even numerator, and slot vectors which are electrical phases of the coils disposed in the slots are made to have unequal slot vector pitch angles in which pitches between the slots are unequal.
    Type: Application
    Filed: March 5, 2014
    Publication date: September 18, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Yasuhiro MIYAMOTO
  • Patent number: 8760023
    Abstract: Electrical machines, for example transverse flux machines and/or commutated flux machines, may be configured to achieve reduced overall cogging torque via implementation of a sixth-phase offset. Individual cogging torque waveforms in the electrical machine may be evenly distributed across one-sixth of a voltage phase or other suitable spacing, resulting in a reduced magnitude and/or increased sinusoidality of the overall cogging torque waveform for the electrical machine.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: June 24, 2014
    Assignee: Electric Torque Machines, Inc.
    Inventors: David G. Calley, Daniel S. Cole, John M. Dyer, Thomas F. Janecek
  • Patent number: 8749104
    Abstract: A rotating electric machine, especially synchronous permanent magnet machine, is provided. The machine includes a rotor with a given number of magnets distributed along the circumference and a given number of rotor pole pairs, and further comprising a stator with a given number of stator pole pairs and a given number of stator slots. The efficiency and the power of the machine are improved by making the number of stator pole pairs independent of the number of rotor pole pairs.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: June 10, 2014
    Assignee: Alstom Renewable Technologies
    Inventor: Charles Smadja
  • Patent number: 8751192
    Abstract: Methods and systems are provided for assessing a vehicle transmission having a resolver. A memory is configured to store preliminary data pertaining to an error of the resolver. A processor is coupled to the memory, and is configured to determine a harmonic characteristic of the preliminary data, and to assess the vehicle transmission using the harmonic characteristic.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: June 10, 2014
    Assignee: GM Global Technology Operations LLC
    Inventors: Steven E. Schulz, Bon Ho Bae, Silva Hiti, Min Dai, Harry J. Bauer, Samuel J. Harbin
  • Patent number: 8698368
    Abstract: An electric motor, a hoisting machine and also an elevator system are disclosed. The electric motor includes a stator, which stator includes slots, into which slots a concentrated winding is fitted. The electric motor also includes a rotating rotor, which rotor includes permanent magnets placed consecutively in a ring in the direction of the rotational movement. The ratio (LM/LP) of the width of a permanent Lp magnet at the point (LM) of the center line of the magnet and the width (LP)? of a magnetic pole of the rotor is at least ? and at most ?.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: April 15, 2014
    Assignee: Kone Corporation
    Inventors: Jussi Huppunen, Asmo Tenhunen
  • Patent number: 8638012
    Abstract: A rotor for a synchronous reluctance machine wherein a torque ripple behaviour of the machine is optimized by altering the geometry of insulating barriers of the rotor. A q-axis pitch angle is used as a design variable instead of setting its value equal to the rest of the rotor slot pitches or binding its value to the stator slot pitch. The resulting rotor has a non-regular slot pitch across the q-axis and substantially regular slot pitch otherwise. Synchronous reluctance machines that employ rotor discs and rotor assemblies in accordance with the present invention may exhibit low torque ripple without sacrificing high torque values.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: January 28, 2014
    Assignee: ABB Research Ltd.
    Inventor: Reza Rajabi Moghaddam
  • Patent number: 8461739
    Abstract: A stator for an electric machine has a circular stator body surrounding a rotor with an air gap therebetween. The stator has radially extending slots that define radially extending stator teeth. Multiple electric windings are located in the slots to define peripherally spaced magnetic poles. Separate coil groups establish multiple phases for the electric machine. Motor torque ripple is attenuated by forming the stator teeth with different widths for a given coil group.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: June 11, 2013
    Assignee: Ford Global Technologies, LLC
    Inventors: Feng Liang, Michael W. Degner, Wei Wu, Franco Leonardi
  • Publication number: 20130088116
    Abstract: A rotor for an electrical machine including a plurality of pole sections with adjacent poles within each of the pole sections being distanced by a first uniform pole pitch. Adjacent poles belonging to different pole sections are distanced by a second (smaller) pole pitch at one end of each pole section, and by a third (larger) pole pitch at the other end of each pole section. Alternatively, a corresponding adjustment of coil pitches can be done in a stator of an electrical machine.
    Type: Application
    Filed: October 12, 2012
    Publication date: April 11, 2013
    Inventors: Robert Chin, Juhani Mantere
  • Patent number: 8232704
    Abstract: An electric motor comprises a stator and a rotor rotatably mounted confronting the stator. The rotor has a rotor core which comprises at least a first tooth, a second tooth and a third tooth which are adjacent. Each of the teeth comprises a rib section radially and outwardly extending from a core and a tooth section located at an outer end of the rib section. The angle between the first tooth and the second tooth is n degrees, wherein when the rotor core is rotated n degrees to move the first tooth towards the second tooth, the rotated second tooth does not coincide with the pre-rotated third tooth.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: July 31, 2012
    Assignee: Johnson Electric S.A.
    Inventors: Rui Feng Qin, Fei Liu
  • Patent number: 8222786
    Abstract: Electrical machines, for example transverse flux machines and/or commutated flux machines, may be configured to achieve reduced overall cogging torque via implementation of a sixth-phase offset. Individual cogging torque waveforms in the electrical machine may be evenly distributed across one-sixth of a voltage phase or other suitable spacing, resulting in a reduced magnitude and/or increased sinusoidality of the overall cogging torque waveform for the electrical machine.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: July 17, 2012
    Assignee: Motor Excellence LLC
    Inventors: David G. Calley, Daniel S Cole, John M. Dyer, Thomas F. Janecek
  • Publication number: 20110309712
    Abstract: A stator for an electrical machine, the stator including a plurality of stator teeth distributed in a non-uniform pattern with a short and long tooth spans along a circumference of the stator, wherein each stator slot between two stator teeth distanced by a long tooth span including an intermediate tooth for carrying a magnetic flux.
    Type: Application
    Filed: August 27, 2011
    Publication date: December 22, 2011
    Inventor: Robert Chin
  • Patent number: 7989996
    Abstract: The invention relates to a five-phase electric generator (1), in particular for a motor vehicle, said generator comprising five electric branches (12) for five different phases, the latter being electrically connected at interconnection points (14). The electric angle (?) ranges between 25° and 36° at said interconnection points (14).
    Type: Grant
    Filed: May 22, 2006
    Date of Patent: August 2, 2011
    Assignee: Robert Bosch GmbH
    Inventors: Gert Wolf, Norbert Pfitzke
  • Publication number: 20110169366
    Abstract: Electrical machines, for example transverse flux machines and/or commutated flux machines, may be configured to achieve reduced overall cogging torque via implementation of a sixth-phase offset. Individual cogging torque waveforms in the electrical machine may be evenly distributed across one-sixth of a voltage phase or other suitable spacing, resulting in a reduced magnitude and/or increased sinusoidality of the overall cogging torque waveform for the electrical machine.
    Type: Application
    Filed: May 3, 2010
    Publication date: July 14, 2011
    Applicant: MOTOR EXCELLENCE LLC
    Inventors: David G. Calley, Daniel S. Cole, John M. Dyer, Thomas F. Janecek
  • Patent number: 7923880
    Abstract: A single phase stepping motor has a stator, and a rotor disposed to surround the stator. The stator includes first and second annular stator yokes, which are disposed opposite to each other and have a plurality of pole teeth formed along a circumference thereof, and an annular stator coil disposed between the first and second stator yokes. The rotor includes a ring magnet, which is disposed to surround the first and second stator yokes, and has a plurality of magnetic poles formed along a circumference of the rotor, and a shaft disposed at a center position of the magnet. At least a partial region of a gap formed between each of the pole teeth and the opposing magnetic pole of the magnet is non-uniform in a predetermined direction.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: April 12, 2011
    Assignee: Minebea Motor Manufacturing Corporation
    Inventor: Masaaki Matsubara
  • Publication number: 20110074243
    Abstract: A stator for an electric machine has a circular stator body surrounding a rotor with an air gap therebetween. The stator has radially extending slots that define radially extending stator teeth. Multiple electric windings are located in the slots to define peripherally spaced magnetic poles. Separate coil groups establish multiple phases for the electric machine. Motor torque ripple is attenuated by forming the stator teeth with different widths for a given coil group.
    Type: Application
    Filed: September 25, 2009
    Publication date: March 31, 2011
    Applicant: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Feng Liang, Michael W. Degner, Wei Wu, Franco Leonardi
  • 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: 7755246
    Abstract: The present invention relates to a pole piece structure of stator with radial winding, which employs an optimum ratio ? to define the form of the pole piece, increase the overlap region of inductance and torque and lower the cogging torque of a motor, so as to strengthen the self-starting capability of the motor and minimize torque ripple to enhance the overall performance of the motor. The pole piece structure includes a hub having a hole at the center, and a plurality of poles integrally formed on the periphery of the hub, extended to radiate in a radial direction, and having a pole shoe expanded from an end of each pole in a tangential direction, wherein the angle of a single pole shoe is divided by a pitch angle of two adjacent poles to obtain a ratio in a range of 0.86˜0.95.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: July 13, 2010
    Assignee: Sunonwealth Electric Machine Industry Co., Ltd.
    Inventors: Alex Horng, Jhin-Nan Chen, Chi-Min Wang, Hung-Chin Mai
  • Publication number: 20100127593
    Abstract: An electric motor comprises a stator and a rotor rotatably mounted confronting the stator. The rotor has a rotor core which comprises at least a first tooth, a second tooth and a third tooth which are adjacent. Each of the teeth comprises a rib section radially and outwardly extending from a core and a tooth section located at an outer end of the rib section. The angle between the first tooth and the second tooth is n degrees, wherein when the rotor core is rotated n degrees to move the first tooth towards the second tooth, the rotated second tooth does not coincide with the pre-rotated third tooth.
    Type: Application
    Filed: November 20, 2009
    Publication date: May 27, 2010
    Inventors: Rui Feng QIN, Fei Liu
  • Patent number: 7640648
    Abstract: Methods of fabricating a magnetic flux channel for a transverse wound electric motor by forming a ring of plural adjacent molded magnetic flux channel pole pieces and a second ring of opposite pole pieces. The two rings are mated such that each pole piece mates with an opposite pole piece to form magnetic flux channels and a c-shaped recess forms a winding channel for a transverse phase winding. After mating, the rings are bonded together to form a stator assembly of the transversely wound electric motor. The two rings may be approximately identical, or the two rings may be different as long as they mate to form the plural molded magnetic flux channels and the transverse phase winding channel. The molds may be designed to form the outer surface of a stator assembly. Molds of adjacent phases may be combined back-to-back to reduce part count and increase mechanical strength.
    Type: Grant
    Filed: June 6, 2008
    Date of Patent: January 5, 2010
    Inventor: Norman Rittenhouse
  • Publication number: 20090184602
    Abstract: The invention relates to a permanently excited synchronous machine (1) comprising a stator (2) provided with slots (5) and a rotor (3) provided with permanent magnets (9) which form a magnetic pole (10). The machine also comprises first suppression means in the form of a pole covering (x) which is smaller than one in relation to a pole distribution (tp) of the permanent magnets (9), second suppression means in the form of a first staggering of the permanent magnets of a pole or a first inclination of the permanent magnets or a first inclination (?Schi) of the slots (5), and third suppression means in the form of a second staggering (?st2) of the permanent magnets (9) of a pole (10) or a second inclination (?Sch2) of the permanent magnets (9) or a second inclination of the slots.
    Type: Application
    Filed: September 16, 2005
    Publication date: July 23, 2009
    Applicant: Siemens Aktiengesellschaft
    Inventors: Matthias Braun, Holger Schunk, Rolf Vollmer