Induced Flux Return Poles Patents (Class 310/156.54)
  • Patent number: 11601024
    Abstract: In an IPM motor, since an end surface portion which is a pressed powder compact made of soft magnetic powder has a higher electrical resistivity than an electrical resistivity of a main body portion made of a laminated steel sheet, compared to when the electrical resistivity of the end surface portion is the same as the electrical resistivity of the main body portion, the occurrence of an eddy current in the end surface portion is further prevented. For this reason, in the IPM motor, a deterioration in efficiency caused by an eddy current loss is prevented, and an improvement in efficiency is realized.
    Type: Grant
    Filed: May 7, 2020
    Date of Patent: March 7, 2023
    Assignee: TDK Corporation
    Inventors: Nobuyuki Shimbo, Koji Mitake
  • Patent number: 11152825
    Abstract: A rotor for an electric machine includes pairs of magnets with a bridge region therebetween. Lamination that comprise the rotor may define openings in the bridge region between the magnets of each of the pairs. A clip may be installed in the openings and a bonding material may fill the remainder of the bridge region.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: October 19, 2021
    Assignee: Ford Global Technologies, LLC
    Inventors: Franco Leonardi, Michael W. Degner, Chun Tang, Edward Chan-Jiun Jih, Kewei Xiao
  • Patent number: 11108289
    Abstract: A rotor includes a rotor core, first magnetic poles that respectively include a plurality of permanent magnets and have a first polarity provided by the permanent magnets, and second magnetic poles that are each formed between the permanent magnets adjacent to one another and are salient poles having a polarity different from the first polarity. ?im and ?is satisfy the relation ?im>?is. ?om and ?os satisfy the relation (?om×1.1)??os?(?om×0.9). The rotor thus obtained can suppress increase in cogging torque while suppressing decrease in torque.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: August 31, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuichiro Nakamura, Koji Shimomura, Yu Hirotani, Kenta Setaka
  • Patent number: 10855126
    Abstract: An electric motor includes a stator and a consequent-pole-type rotor including an annular rotor core disposed on an inner side of the stator and a plurality of permanent magnets disposed inside the rotor core and arrayed in a circumferential direction of the rotor core. The rotor core includes at least one slit provided inside the rotor core and disposed on an outer side of each of the permanent magnets in a radial direction of the rotor core, and at least one slit provided on an outer circumferential surface of the rotor core and disposed between the permanent magnets adjacent to each other.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: December 1, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomoaki Oikawa, Mineo Yamamoto, Hiroyuki Ishii, Hiroki Aso, Junichiro Oya, Yuto Urabe, Takaya Shimokawa, Koji Yabe
  • Patent number: 10622873
    Abstract: In the case of a laminated rotor core 10, insertion of permanent magnets 14 and filling of resin 15 into each of magnet insertion holes 13 are performed in order to cancel out a problem of an imbalanced weight estimated from a deviation of lamination thickness in a circumferential direction of a laminated core body 12, and a manufacturing method includes a step of measuring a deviation of lamination thickness in which an imbalanced weight is estimated by measuring the deviation of lamination thickness in the circumferential direction of the laminated core body 12, and a step of balance adjustment in which the insertion of the permanent magnets 14 into each of the magnet insertion holes 13 and the filling of resin 15 into each of the magnet insertion holes 13 are performed in a manner that cancels out a problem of this imbalanced weight.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: April 14, 2020
    Assignees: MITSUI HIGH-TEC, INC., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akira Nagai, Kenji Katsuki, Go Kato, Jin Oda, Yuzo Ohta, Masashi Matsumoto, Tatsuhiko Mizutani
  • Patent number: 10411536
    Abstract: An electric motor rotor (100) and an electric motor having the same are provided. The electric motor rotor (100) includes a rotor body (1) provided with a rotor bore (11) and a plurality of magnetic steel slots (12) surrounding the rotor bore (11), in which an outer contour of the rotor body (1) includes a plurality of concentric arc segments (101) in concentric with the rotor bore (11) and a plurality of connecting line segments (102) connecting adjacent concentric arc segments (101), and the connecting line segment (102) includes at least one straight line segment (1021), in which an included angle ? between a central normal line of each straight line segment (1021) and a connecting line between a midpoint of the straight line segment (1021) and a center of the rotor bore (11) satisfies 0°???20°; and a plurality of magnetic steel bars (2).
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: September 10, 2019
    Assignee: GUANGDONG MEIZHI COMPRESSOR CO., LTD.
    Inventors: Guangming Peng, Fei Wang, Lidan Zhao, Jintao Chen, Z. Q. Zhu
  • Patent number: 10396609
    Abstract: Magnetic flux short-circuit preventing slits extend from opposite ends of two permanent magnets in an outer circumferential surface of a rotor toward a center of a magnetic pole. Grooves formed in the outer circumferential surface can be located at a distance from each other symmetrically with respect to the center of the magnetic pole and at a distance from a groove of an adjacent magnetic pole in the outer circumferential surface. Relations are established as ?f=n×?s and ?s=n×?s where ?s designates a pitch of stator winding slots, which pitch is converted into an angle around a rotation center, ?f designates an angle between the magnetic flux short-circuit preventing slits, ?s designates an angle between the grooves, and n designates a predetermined integer. Thereby, a permanent magnet-embedded type rotary electric machine in which the influence of a manufacturing error can be minimized so that cogging torque can be reduced stably.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: August 27, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Kenichi Mae, Hideki Oguchi
  • Patent number: 9800102
    Abstract: A motor includes a stator, a rotor and a case. The rotor includes a first rotor core, a second rotor core, and a field magnet. Each of the first rotor core and the second rotor core includes a core base and a plurality of claw poles. The field magnet is located between the core bases. The case includes a cylindrical yoke housing and a lid. To balance magnetic flux from the first rotor core with magnetic flux from the second rotor core, the distance between the rotor and the stator is varied from the distance between the rotor and the yoke housing or the teeth of the stator are shaped to enable magnetic saturation.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: October 24, 2017
    Assignee: ASMO CO., LTD.
    Inventor: Koji Mikami
  • Patent number: 9667107
    Abstract: A motor including a stator and a rotor. The stator includes teeth and windings. Each tooth has a distal portion defined by a radially inward side of the stator. The rotor, which is arranged inward in the radial direction from the stator, includes a rotor core, magnets, and salient poles. Each salient pole is separated by a void from the magnet that is adjacent in the circumferential direction. The distal portion of each tooth is longer than a radially outward side of each magnet.
    Type: Grant
    Filed: May 27, 2014
    Date of Patent: May 30, 2017
    Assignee: Asmo Co., Ltd.
    Inventors: Yoji Yamada, Seiya Yokoyama, Keisuke Koide, Yoshiaki Takemoto, Shigemasa Kato
  • Patent number: 9577481
    Abstract: A rotor as disclosed for an electric machine which includes a rotor core having a plurality of rotor sheets stacked in an axial direction, each of the plurality of rotor sheets having a plurality of flux paths made of a material of high permeance, a plurality of flux barriers made of a material of low permeance, a plurality of bridges made of a material of high permeance, each of the plurality of bridges extending across a corresponding flux barrier, and at least one axial magnet located axially adjacent a corresponding bridge and configured to saturate the corresponding bridge, each axial magnet being axially pressed between two elements at least one of which is a bridge corresponding to the axial magnet.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: February 21, 2017
    Assignee: ABB Schweiz AG
    Inventor: Jere Kolehmainen
  • Patent number: 9178392
    Abstract: A rotor of a permanent magnet embedded motor according to this invention includes: a rotor iron core formed by stacking a predetermined number of electromagnetic steel plates perforated in a predetermined shape; a plurality of permanent magnet insertion holes formed along an outer circumferential section of the rotor iron core; permanent magnet end gaps provided at both ends of the permanent magnet insertion hole; a permanent magnet inserted in the permanent magnet insertion hole; and a plurality of slits formed in an iron core section on the outer side of the permanent magnet insertion hole. The width in the radial direction of a slit thin section of each of the slits between the slit and the rotor iron core outer circumference gradually increases from an inter-electrode side toward a magnetic pole center and changes in a sine wave shape having a peak in the magnetic pole center.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: November 3, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Koji Yabe, Yoshikazu Fujisue, Hayato Yoshino, Kazuhiko Baba, Tomoaki Oikawa
  • Patent number: 9083218
    Abstract: A permanent magnet excited synchronous machine (1) with embedded magnets, which is particularly suitable for range extender generator. It includes stator (2) and rotor (3) being provided with exciter magnets (7). The rotor (3) has at least two rotor poles (4), each is provided with one exciter magnet (7). In order to increase the magnetic torque limit of the synchronous machine (1)—in each rotor pole (4) at least one, preferably several selective magnetic flux barriers, preferably as substantially radial slots (8) being parallel with the main pole flux is/are provided in the area of the pole shoe.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: July 14, 2015
    Assignee: BRUSA Elektronik AG
    Inventors: Verena Mathoy, Anna Mathoy, Eva Mathoy
  • Patent number: 9041269
    Abstract: There is provided a motor including a rotor and a stator arranged outside the rotor in the radial direction. The rotor includes a rotor core, a plurality of magnets arranged at equal intervals in the circumferential direction of the rotor core and functioning as one magnetic pole, and salient poles integrated with the rotor core, each arranged between adjacent magnets and at a distance from the magnets. The salient poles function as the other magnetic pole. A stator has a stator core having a plurality of teeth extending in the radial direction of the stator and arranged at equal intervals in the circumferential direction, and multi-phase coils attached to the teeth.
    Type: Grant
    Filed: June 14, 2011
    Date of Patent: May 26, 2015
    Assignee: Asmo Co., Ltd.
    Inventors: Shigemasa Kato, Seiya Yokoyama, Yoji Yamada, Keisuke Koide, Yoshiaki Takemoto, Shinji Santo
  • Patent number: 9024499
    Abstract: A rotating electric machine rotor is equipped with a rotor core and a pair of permanent magnets disposed in a V-shape that opens toward an outer periphery of the rotor core. The pair of permanent magnets is separated in an inner periphery direction of the rotor core, and the rotor core contains a gap formed by connecting between at least the separated permanent magnets.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: May 5, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Tohru Nakada
  • Patent number: 8981611
    Abstract: A rotor includes magnetic pole portions and first and second ferric core portions. The first and second ferric core portions are each located between magnetic pole portions in the circumferential direction of a rotor. A first gap is formed between the first or second ferric core portion and a magnetic pole portion at a first circumferential side. A second gap is formed between the first or second ferric core portion and the magnetic pole portion at a second circumferential side. The first gap has a smaller width than the second gap at the first ferric core portion. The first ferric core portion is inclined toward the first circumferential side. The first gap is larger than the second gap at the second ferric core portion. The second ferric core portion is inclined toward the second circumferential side.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: March 17, 2015
    Assignee: ASMO Co., Ltd.
    Inventors: Kenta Goto, Hideaki Nishiura, Shigemasa Kato, Yoshiyuki Takabe, Masashi Matsuda, Toshihiro Uchida
  • Patent number: 8916999
    Abstract: A motor includes a motor case, and a rotor and a stator, which are disposed in the case. The case has a tubular portion, a front cover mounted to an axial end of the portion, and a rear cover mounted to the other axial end of the portion. The rotor has a rotary shaft and the stator includes a plurality of teeth, which extend toward a central axis of the shaft and are circumferentially disposed at equal intervals. Between each circumferentially adjacent pair of the teeth, a slot extending toward the axis is formed. In each slot, a U-shaped segment is inserted in parallel with the axis. The distal ends of the segments projecting out from the slots are electrically interconnected, thereby forming an SC coil including the segments disposed circumferentially. The SC coil includes a receiving terminal, and the terminal includes leads extending in parallel to the axis.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: December 23, 2014
    Assignee: Asmo Co., Ltd.
    Inventors: Hiroshi Imai, Yusuke Tateishi, Keisuke Koide, Tatsunori Banba, Takumi Suzuki, Yoshikazu Fujii
  • Patent number: 8803394
    Abstract: In a rotor for a rotary electric machine, a plurality of magnetic poles are provided in a radially outer portion of the rotor iron core, at intervals in the circumferential direction. Each magnetic pole includes a pair of permanent magnets disposed apart from each other in the circumferential direction, and a magnetic flux-restraining hole that is formed and extended radially inwardly between radially inner end portions of the permanent magnets and that restrains flow of magnetic flux. The magnetic flux-restraining hole is extended so as to project beyond a position of the radially inner end portions to a radially outer side, between the pair of permanent magnets.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: August 12, 2014
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha, Aisin AW Co., Ltd.
    Inventors: Shinya Sano, Ken Takeda, Tomohiro Inagaki, Shinichi Otake, Tsuyoshi Miyaji, Akifumi Kurokawa
  • 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: 8704472
    Abstract: An AC electric motor includes an annular A-phase winding WA wound in the circumferential direction of a stator, a stator pole group SPGA configured to generate magnetic flux ?A to interlink with the A-phase winding WA, an annular B-phase winding WB wound in the circumferential direction, and a stator pole group SPGB configured to generate magnetic flux ?B to interlink with the B-phase winding WB. The motor additionally includes a third stator pole group SPGC, N and S magnetic poles of the rotor, and X magnetic poles, which serve as third rotor poles, showing magnetic characteristics between the N and S magnetic poles of the rotor. DC currents are supplied to the A-phase and B-phase windings WA and WB to generate rotational torque.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: April 22, 2014
    Assignee: Denso Corporation
    Inventor: Masayuki Nashiki
  • Patent number: 8653709
    Abstract: This disclosure discloses a rotating electrical machine comprising: a stator; and a rotor; one of said stator and said rotor having a coil, the other having a plurality of magnetic pole units each forming first and second magnetic poles configured to be aligned alternately and to have mutually opposite polarities at a side of the one of said stator and said rotor, each of said magnetic pole units comprising: a unit core that a projecting part configured to protrude toward the side of the one of said stator and said rotor is formed; and a permanent magnetic provided between each of said projecting parts on the side of the one of said stator and said rotor from said unit core, said first magnetic pole being formed by said permanent magnet, and said second magnetic pole being formed by each of said projecting parts.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: February 18, 2014
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Yasuhiro Miyamoto, Hiroshi Tsumagari, Daisuke Morishita
  • Patent number: 8643239
    Abstract: A motor including a rotor and a stator. The rotor includes a rotor core, magnet pole portions, and core pole portions. First magnetic pole portions, which are the magnet pole portions or the core pole portions, each include a first and second opposing parts arranged in an axial direction. Each first opposing part includes an auxiliary groove, and each second opposing part does not include an auxiliary groove. Where M(°) represents an open angle of the first magnetic pole portion, G(°) represents an open angle of the void, and L represents the number of teeth, an angle D1 from a center line in the circumferential direction of the first magnetic pole portion to the side surface in the auxiliary groove that is closer to the center line in the circumferential direction satisfies D1=M/2+G?a×360(°)/L (where a is a natural number).
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: February 4, 2014
    Assignee: Asmo Co., Ltd.
    Inventors: Yoshiaki Takemoto, Shigemasa Kato, Seiya Yokoyama, Keisuke Koide
  • Patent number: 8536749
    Abstract: A motor having a rotor and a stator is disclosed. The rotor is a consequent-pole rotor having a rotor core, a plurality of magnets, and a plurality of salient poles. The stator includes a stator core and multiphase coils. Each coil is wound about the teeth by distributed winding, in such a manner as to wind two or more consecutive teeth in single winding. The opening degree each of salient pole opposed to the distal ends of the teeth is set greater than or equal to twice the opening angle of the distal end of each tooth.
    Type: Grant
    Filed: October 5, 2010
    Date of Patent: September 17, 2013
    Assignee: ASMO Co., Ltd.
    Inventors: Keisuke Koide, Seiya Yokoyama, Shigemasa Kato, Yoji Yamada, Yoshiaki Takemoto, Shinji Santo
  • Patent number: 8487495
    Abstract: A rotor includes a hub, a rotor core, holes and permanent magnets. Salient poles are each formed between neighboring openings on a circumference of the rotor core and, when viewed from a front along a line of axis of the rotor, a recessed portion that is formed by causing one portion of an inner circumferential surface of the rotor core to bulge radially outward of another portion is provided in a region enclosed by a first virtual line connecting a center of the hub and a circumferential middle position on the circumference of a magnetic pole of the rotor core having permanent magnets provided therein and a second virtual line connecting the center of the hub and a circumferential middle position on the circumference of the salient pole adjacent to the magnetic pole at a leading side in a rotational direction of the rotor.
    Type: Grant
    Filed: September 22, 2011
    Date of Patent: July 16, 2013
    Assignee: Honda Motor Co., Ltd.
    Inventor: Daijiro Takizawa
  • Patent number: 8441163
    Abstract: The present invention essentially relates to an electric machine (1.1) with homopolar double excitation, comprising a rotor particularly consisting of a central portion (51) made of a solid magnetic material and a laminated annular portion (53) located at the periphery of the solid portion. In addition, the rotor comprises permanent magnets (54), the magnetization thereof being radially oriented relative to the axis (33) of the rotor (31), and separated from one another such that the double excitation flow generated by the field coils (38, 39) can enter the rotor (31, 67) via the flanges (48, 49) of the rotor, and come back out via the spaces between the magnets (54), or vice-versa.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: May 14, 2013
    Assignee: Peugeot Citroen Automobiles SA
    Inventors: Victor Moynot, Franck Chabot, Michel Lecrivain, Mohamed Gabsi, Sami Hlioui
  • Publication number: 20130106229
    Abstract: A rotor includes magnetic pole portions and first and second ferric core portions. The first and second ferric core portions are each located between magnetic pole portions in the circumferential direction of a rotor. A first gap is formed between the first or second ferric core portion and a magnetic pole portion at a first circumferential side. A second gap is formed between the first or second ferric core portion and the magnetic pole portion at a second circumferential side. The first gap has a smaller width than the second gap at the first ferric core portion. The first ferric core portion is inclined toward the first circumferential side. The first gap is larger than the second gap at the second ferric core portion. The second ferric core portion is inclined toward the second circumferential side.
    Type: Application
    Filed: October 24, 2012
    Publication date: May 2, 2013
    Applicant: ASMO Co., Ltd.
    Inventor: ASMO Co., Ltd.
  • Publication number: 20120326550
    Abstract: A stator manufacturing method includes the steps of preparing an armature core, forming an insulating member including two opposing portions from a sheet-like insulating material, and deforming the insulating member to move the two opposing portions toward each other. The method also includes the step of inserting distal parts of the two opposing portions into the corresponding slit from the axial direction thereby covering an inner surface of each of the slot with the insulating member. Further, the method includes the steps of inserting a conductor forming a winding into each of the slots between the two opposing portions.
    Type: Application
    Filed: June 22, 2012
    Publication date: December 27, 2012
    Applicant: ASMO CO., LTD.
    Inventors: Yoshimasa KINPARA, Yasuhiro KANEMATSU
  • Patent number: 8242654
    Abstract: A motor is disclosed that includes a rotor having a consequent-pole structure. The rotor core of the rotor includes a magnetic flux dividing portion at each position that faces one of the magnets. Each magnetic flux dividing portion forcibly divides magnetic flux in the vicinity of the backside of the corresponding magnet to both sides in the circumferential direction.
    Type: Grant
    Filed: May 13, 2010
    Date of Patent: August 14, 2012
    Assignee: Asmo Co., Ltd.
    Inventors: Yoji Yamada, Seiya Yokoyama, Shigemasa Kato, Yoshiaki Takemoto, Yoko Tateishi
  • Patent number: 8193672
    Abstract: Disclosed is an interior permanent magnet type brushless direct current (BLDC) motor including a stator having a plurality of slots wound in a distributed winding manner, and a rotor positioned in the stator, configured to rotate with respect to the stator, and having a rotor core, a plurality of permanent magnets inserted in the rotor core and a plurality of flux barriers, wherein a flux barrier angle of the rotor is determined by multiples of twenty as an electrical angle and the multiples of twenty relates to a number of slots of the stator.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: June 5, 2012
    Assignee: LG Electronics Inc.
    Inventors: Seung-Suk Oh, Jin-Soo Park
  • Patent number: 8169117
    Abstract: The present invention provides a brushless motor for a fluid pump that allows implementing a fluid pump that overcomes problems of durability and reduction of energy efficiency due to DC motors in the related art and provides excellent operational characteristics, by ensuring a space allowing fluid to flow between a stator and a rotor, and ensuring and maintaining excellent driving characteristics of a motor, and a fluid pump using the brushless motor.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: May 1, 2012
    Assignee: Donghee Industrial Co., Ltd.
    Inventors: Jongsang Noh, Jonggeun Cha, Jongman Lee
  • Publication number: 20120025534
    Abstract: This disclosure discloses a rotating electrical machine comprising: a stator; and a rotor; one of said stator and said rotor having a coil, the other having a plurality of magnetic pole units each forming first and second magnetic poles configured to be aligned alternately and to have mutually opposite polarities at a side of the one of said stator and said rotor, each of said magnetic pole units comprising: a unit core that a projecting part configured to protrude toward the side of the one of said stator and said rotor is formed; and a permanent magnetic provided between each of said projecting parts on the side of the one of said stator and said rotor from said unit core, said first magnetic pole being formed by said permanent magnet, and said second magnetic pole being formed by each of said projecting parts.
    Type: Application
    Filed: March 15, 2011
    Publication date: February 2, 2012
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Yasuhiro MIYAMOTO, Hiroshi TSUMAGARI, Daisuke MORISHITA
  • Publication number: 20120019089
    Abstract: A motor including a rotor and a stator. The rotor includes a rotor core, magnet pole portions, and core pole portions. First magnetic pole portions, which are the magnet pole portions or the core pole portions, each include a first and second opposing parts arranged in an axial direction. Each first opposing part includes an auxiliary groove, and each second opposing part does not include an auxiliary groove. Where M (°) represents an open angle of the first magnetic pole portion, G (°) represents an open angle of the void, and L represents the number of teeth, an angle D1 from a center line in the circumferential direction of the first magnetic pole portion to the side surface in the auxiliary groove that is closer to the center line in the circumferential direction satisfies)D1=M/2+G?a×360 (°)/L (where a is a natural number).
    Type: Application
    Filed: July 18, 2011
    Publication date: January 26, 2012
    Applicant: Asmo Co., Ltd.
    Inventors: Yoshiaki Takemoto, Shigemasa Kato, Seiya Yokoyama, Keisuke Koide
  • Publication number: 20110309707
    Abstract: There is provided a motor including a rotor and a stator arranged outside the rotor in the radial direction. The rotor includes a rotor core, a plurality of magnets arranged at equal intervals in the circumferential direction of the rotor core and functioning as one magnetic pole, and salient poles integrated with the rotor core, each arranged between adjacent magnets and at a distance from the magnets. The salient poles function as the other magnetic pole. A stator has a stator core having a plurality of teeth extending in the radial direction of the stator and arranged at equal intervals in the circumferential direction, and multi-phase coils attached to the teeth. The plurality of salient poles are arranged to have center portions arranged at equal intervals in the circumferential direction, and each have an outer surface extending in the circumferential direction in a range of a predetermined opening angle having an axis of the rotor as a center.
    Type: Application
    Filed: June 14, 2011
    Publication date: December 22, 2011
    Applicant: Asmo Co., Ltd.
    Inventors: Shigemasa Kato, Seiya Yokoyama, Yoji Yamada, Keisuke Koide, Yoshiaki Takemoto, Shinji Santo
  • Publication number: 20110278978
    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 2 k (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: Application
    Filed: May 11, 2011
    Publication date: November 17, 2011
    Applicant: DENSO CORPORATION
    Inventors: Makoto TANIGUCHI, Asuka Tanaka
  • Publication number: 20110193440
    Abstract: A motor having a rotor and a stator is disclosed. A motor having a rotor and as stator is disclosed. The rotor is a consequent-pole rotor having a rotor core, a plurality of magnets, and a plurality of salient poles. The stator includes a plurality of teeth. The stator is arranged to be opposite to the rotor with a gap along the radial direction. The gap between the stator and the rotor is set to satisfy an expression 1<B/A, where A represents the shortest gap distance between the stator and the magnets, and B represents the shortest gap distance between the stator and the salient poles.
    Type: Application
    Filed: October 5, 2010
    Publication date: August 11, 2011
    Applicant: ASMO CO., LTD.
    Inventors: YOJI YAMADA, SEIYA YOKOYAMA, YOSHIAKI TAKEMOTO, SHIGEMASA KATO, KEISUKE KOIDE, SHINJI SANTO
  • Publication number: 20110193441
    Abstract: The present invention essentially relates to an electric machine (1.1) with homopolar double excitation, comprising a rotor particularly consisting of a central portion (51) made of a solid magnetic material and a laminated annular portion (53) located at the periphery of the solid portion. In addition, the rotor comprises permanent magnets (54), the magnetisation thereof being radially oriented relative to the axis (33) of the rotor (31), and separated from one another such that the double excitation flow generated by the field coils (38, 39) can enter the rotor (31, 67) via the flanges (48, 49) of the rotor, and come back out via the spaces between the magnets (54), or vice-versa.
    Type: Application
    Filed: November 9, 2009
    Publication date: August 11, 2011
    Applicant: PEUGEOT CITROEN AUTOMOBILES SA
    Inventors: Victor Moynot, Franck Chabot, Michel Lecrivain, Mohamed Gabsi, Sami Hlioui
  • Publication number: 20110148240
    Abstract: A motor having a rotor and a stator is disclosed. The rotor is a consequent-pole rotor having a rotor core, a plurality of magnets, and a plurality of salient poles. The stator includes a stator core and multiphase coils. Each coil is wound about the teeth by distributed winding, in such a manner as to wind two or more consecutive teeth in single winding. The opening degree each of salient pole opposed to the distal ends of the teeth is set greater than or equal to twice the opening angle of the distal end of each tooth.
    Type: Application
    Filed: October 5, 2010
    Publication date: June 23, 2011
    Applicant: ASMO CO., LTD.
    Inventors: Keisuke Koide, Seiya Yokoyama, Shigemasa Kato, Yoji Yamada, Yoshiaki Takemoto, Shinji Santo
  • Patent number: 7948138
    Abstract: A rotor is provided with a rotor core, a magnet inserted into the rotor core and a filling portion arranged in a space between the rotor core and the magnet. The space between the rotor core and a radially outer side surface of the magnet has a uniform width in a central portion (portion (A)) with respect to a width direction (of arrow (DR4)) of the magnet. A width of the space in an end portion (portion (B)) with respect to the width direction (of arrow (DR4)) of the magnet is larger than that of the space in the portion (A).
    Type: Grant
    Filed: November 17, 2005
    Date of Patent: May 24, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroyuki Hattori, Akihide Takehara
  • Patent number: 7923881
    Abstract: An electric machine includes a stator and a rotor core positioned adjacent the stator and rotatable about a longitudinal axis. The rotor core includes a plurality of bar apertures, a plurality of elongated flux barriers separate from the bar apertures and positioned radially inward of the bar apertures, and a plurality of magnet slots separate from the bar slots and positioned radially inward of a portion of the bar apertures. The electric machine also includes a plurality of magnets, each positioned in one of the magnet slots. A plurality of conductive bars are each positioned in one of the bar apertures and includes a first end and a second end. A first end ring is coupled to the first end of each of the bars and a second end ring is coupled to the second end of each of the bars.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: April 12, 2011
    Assignee: A.O. Smith Corporation
    Inventors: Dan M. Ionel, Stephen J. Dellinger, Alan E. Lesak, Jeremiah Mattingly
  • Publication number: 20100308680
    Abstract: A motor is disclosed that includes a rotor having a consequent-pole structure. The rotor core of the rotor includes a magnetic flux dividing portion at each position that faces one of the magnets. Each magnetic flux dividing portion forcibly divides magnetic flux in the vicinity of the backside of the corresponding magnet to both sides in the circumferential direction.
    Type: Application
    Filed: May 13, 2010
    Publication date: December 9, 2010
    Applicant: ASMO CO., LTD.
    Inventors: Yoji YAMADA, Seiya YOKOYAMA, Shigemasa KATO, Yoshiaki TAKEMOTO, Yoko TATEISHI
  • Publication number: 20090295248
    Abstract: An electric motor includes a stator with a stator core and a rotor. The rotor includes n magnets polarized along the radial direction of the rotor. The magnets have the same polarization and each forms two magnetic circuits passing through corresponding portions of the stator core, whereby the rotor forms 2n magnetic poles.
    Type: Application
    Filed: May 29, 2009
    Publication date: December 3, 2009
    Inventors: Yongbin LI, Weifeng Yuan, Ning Sun, Xinping Wang
  • Patent number: 7612481
    Abstract: The invention provides a rotor for an electrical motor, e.g. a line-start motor. The rotor comprises a magnet located in a cavity in a rotor core. The core is laminated from sheets of magnetically conductive material and the magnet is secured in the cavity by an end plate which covers the end face. To avoid short circuiting of the magnet, an aperture is provided in the end plate such that a first portion of the opening into the cavity is in communication with the aperture and such that a remaining, second, portion of the cavity is covered by the end plate to secure the magnet in the cavity independently upon the orientation of the end plate around the center axis.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: November 3, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Niels Christian Weihrauch, Peter Scavenius Andersen
  • Patent number: 7521832
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: April 21, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara
  • Patent number: 7425786
    Abstract: A permanent magnet type rotating electrical machine that is capable of producing a higher output and is suitable for high-speed rotation. A pair of nonmagnetic portions are formed in a rotor core at opposite ends of each pole. The waveform of induced voltage and a motor voltage are adjusted based on two parameters, i.e., an angle covering minimum magnetic path portions formed by the nonmagnetic portions and a magnet width. Assuming that a circumferential pitch of teeth cores with respect to a rotor axis is ?s (degree) and an opening angle contained by a circumferential width between radial width minimum points of the pair of magnetic path portions with respect to the rotor axis is ? (degree), ??(n+Y)×?s (n: integer larger than 0) is met. Y=0.5 is set when the stator windings are wound in a distributed winding way, and Y=0.9-1.2 is set when they are wound in a concentrated winding way. The magnet forming one pole is divided into two parts, and a bridge portion is formed between the two divided magnet parts.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: September 16, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Noriaki Hino, Yutaka Matsunobu, Fumio Tajima, Takashi Yasuhara
  • 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: 7345393
    Abstract: A cored motor includes a rotor (21), having a rotor hub (2), a shaft (1) fixed to the rotor hub (2), a rotor yoke (5) in ring shape and a ring magnet (6) fixed to an inner circumferential surface of the rotor yoke (5). A stator (3) has a motor base (13) and a stator core (14) and a sleeve (9) in cylindrical shape fixed to the motor base (13) respectively. A surface of the rotor hub (2) in the motor base side is provided with a recessed portion (23) having an annular shape and a raised portion (24) that protrudes continuously or intermittently in an annular shape. The rotor yoke (5) is fixed to the recessed portion (23) and the ring magnet (6) contacts the raised portion (24) and fixed to the rotor yoke (5). Respective center lines of the rotor yoke (5), the ring magnet (6) and the stator core (14) are aligned in a longitudinal direction along the shaft (1) and are made approximately coincidental with each other.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: March 18, 2008
    Assignee: Victor Company of Japan, Limited
    Inventors: Teruyuki Yajima, Mitsuo Kodama
  • Patent number: 7282827
    Abstract: A permanent magnet motor has permanent-magnet-holding slots 5 formed in those parts of a rotor core 2A which correspond to sides of an approximately regular polygon centered on an axis of the rotor core 2A, permanent magnets 4 inserted in the respective permanent-magnet-holding slots, and four or more radially elongated slits 6 arranged apart from each other along each of the permanent-magnet-holding slots on an outer core outside the permanent-magnet-holding slots, characterized in that at a radially outer end, the slits are spaced approximately equally while at a radially inner end, spacing between the slits is reduced with increasing distance from a center of each permanent magnet, with the spacing at the center being the largest.
    Type: Grant
    Filed: July 28, 2004
    Date of Patent: October 16, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Toshihiko Futami
  • Patent number: 7088029
    Abstract: An electric generator 10 of the present invention comprises a permanent magnet 14, a coil 30, a yoke 20, and attracted means 19 composed of a plurality of attracted pieces 18 which are arranged radially around the rotation axis 12 and are magnetized by the permanent magnet 14. The permanent magnet 14, the coil 30, the yoke 20, and the attracted means 19 are mounted on the rotation axis 12 and the attracted pieces 18 that constitute the attracted means 19 are each placed in positions that correspond to positions that bisect the spaces between the metal pieces that constitute the yoke 20, so that the cogging torque exerted on the rotation axis 12 is reduced.
    Type: Grant
    Filed: December 25, 2002
    Date of Patent: August 8, 2006
    Inventor: Keiji Hiramatsu
  • Patent number: 6919662
    Abstract: A motor including: a rotor including a permanent magnet type rotor unit having a plurality of permanent magnets and a reluctance type rotor unit having a plurality of salient pole portions, the rotor units being coupled to each other in an axial direction; and a stator for generating a field for driving the rotor. The permanent magnet type rotor unit and the reluctance type rotor unit are given an angle deviation therebetween in the direction of rotation to obtain desired torque characteristics. The reluctance type rotor unit has slits for preventing flux leakage from the permanent magnets. The slits are formed with the angle deviation in the direction of rotation from respective positions symmetric about a center of the salient pole portions. Flux leakage is thus prevented to avoid deterioration in characteristics.
    Type: Grant
    Filed: April 25, 2002
    Date of Patent: July 19, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masaki Tagome, Yasuhiro Kondo, Naoyuki Kadoya
  • Patent number: 6727623
    Abstract: An interior permanent magnet machine is disclosed that, in one exemplary embodiment, includes a stator defining a number of stator poles, a rotor, a number of permanent magnets positioned within the interior of the rotor and at least two impedance reduction slits associated with each permanent magnet where the impedance reduction slits are positioned radially outward of the permanent magnets. In further embodiments, each impedance reduction slit is positioned such that at least a portion of the slit is within a defined region.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: April 27, 2004
    Assignee: Emerson Electric Co.
    Inventors: Gary E. Horst, Alan D. Crapo
  • Patent number: RE44037
    Abstract: A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: March 5, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Tajima, Yutaka Matsunobu, Masashi Kitamura, Noriaki Hino, Takashi Kobayashi, Shigeru Kakugawa, Takashi Yasuhara