Magnet Positioned Between Squirrel Cage And Stator Patents (Class 310/156.81)
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Patent number: 9941775Abstract: An assembly includes multiple adjoined rotor sections each having multiple poles and multiple void rows therethrough that are radially distributed in each of the poles. The rotor sections are skewed in a circumferential direction. The assembly also has multiple conductive rings that substantially surround one of the void rows. A method of assembly and electric machines and vehicles using the assembly are also disclosed. Aspects reduce torque ripple in electric machines and allow for encoderless/sensorless operation in an electric machine using the rotor assembly. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.Type: GrantFiled: November 21, 2013Date of Patent: April 10, 2018Assignee: GENERAL ELECTRIC COMPANYInventors: Alexander Felix Fiseni, Kum-Kang Huh, Mohamed Osama, Francesco Papini
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Patent number: 9906108Abstract: An electric machine that includes a rotor core made of magnetic steel; a stator configured with stationary windings therein; openings disposed within or on the rotor core; and a rotor circuit that is configured to introduce saliency based on an orientation of part of the rotor circuit in relationship to a pole location of the electric machine, where the rotor circuit is made of a conductive, non-magnetic material. A rotor component and various embodiments of electric machines are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.Type: GrantFiled: December 3, 2014Date of Patent: February 27, 2018Assignee: General Electric CompanyInventors: Kum Kang Huh, Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Patrick Lee Jansen, Roy David Schultz, Lembit Salasoo
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Patent number: 9871418Abstract: A rotor component that comprises a rotor circuit configured for use with either an interior permanent magnet (IPM) machine or a synchronous reluctance machine (SRM) that includes a pole circuit made of a conductive, non-magnetic material and has a midpoint that substantially aligns with a d-axis of the IPM or SRM. An electric machine with a similar rotor component therein or having a loop or ring of a conductive, non-magnetic material that is substantially concentric about a d-axis of the electric machine.Type: GrantFiled: December 18, 2015Date of Patent: January 16, 2018Assignee: General Electric CompanyInventors: Kum Kang Huh, Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Patrick Lee Jansen, Roy David Schultz, Lembit Salasoo
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Patent number: 9685845Abstract: A rotor (11) with a squirrel cage and permanent magnets (19) mounted on and distributed around the circumference of the rotor, including a core stack extending over the entire rotor region with longitudinally continuous rotor slots extending over the length of the core stack. The squirrel cage is constructed with cage bars disposed, and preferably cast, in the rotor slots; short circuit rings connect the cage bars at both end faces of the core; and the radius of the rotor region is reduced by at least the radial thickness of the magnets. The radius of rotor (11) is reduced over the entire length between short circuit rings (17) such that the radial height of cage bars (15, 29) or cage webs (27) connected thereto is reduced. Also an electric motor or a radial pump having such a rotor, and methods of producing or operating such devices.Type: GrantFiled: March 14, 2014Date of Patent: June 20, 2017Assignee: KSB AktiengesellschaftInventors: Gerhard Huth, Sven Urschel, Ralf Fischer
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Patent number: 8581468Abstract: A stator includes an annular stator core that is comprised of a plurality of stator core segments, an outer ring that is fitted on the radially outer surfaces of the stator core segments so as to fasten them together, and a stator coil mounted on the stator core. Each of the stator core segments is formed of a plurality of stator core sheets that are laminated in the axial direction of the stator core. Each of the stator core sheets has a reinforcement portion that includes a recess formed in one of the major surfaces of the stator core sheet and a protrusion formed on the other major surface. The stator core sheets are laminated so that for each adjoining pair of the stator core sheets, the protrusion of one of the stator core sheets is fitted in the recess of the other stator core sheet.Type: GrantFiled: June 30, 2011Date of Patent: November 12, 2013Assignee: Denso CorporationInventors: Yuichi Kudose, Yusuke Hara, Takashi Hoshiyama
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Patent number: 8575813Abstract: A rotor core for an induction motor. The rotor core includes a body that at least (i) extends axially from an outer surface of the body inward toward a central axis, (ii) extends from a first axial end to a second axial end, and (iii) defines a plurality of internal grooves. Further, each groove at least (iv) includes an opening at the outer surface of the body, (v) is defined by two opposing walls, (vi) extends from the first axial end to the second axial end, (vii) extends axially between the opening at the exterior surface and an inward end, and (viii) includes a body section. And wherein (ix) at least one wall of the opposing walls of the groove includes, in the body section of the groove, an extended segment forming a portion of increased breadth for the groove.Type: GrantFiled: December 17, 2010Date of Patent: November 5, 2013Assignee: GM Global Technology Operations LLCInventors: Richard M. Kleber, Michael J. Walker
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Patent number: 8508091Abstract: An end cover adapted to engage with an end surface of a spindle of a motor rotor is proposed for securely coupling to the spindle with a plurality of permanent magnets disposed around the peripheral wall of the spindle. The end cover has a first surface facing an end surface of the spindle and an second surface opposing to the first surface, which is formed with a plurality of inserting slots indentedly disposed around the rim thereof and corresponding to the permanent magnets for coupling the ends of the permanent magnets, thereby securely fastening each of the permanent magnets to the spindle of the motor rotor. Further, the present invention further provides a motor rotor having the end covers described above.Type: GrantFiled: December 30, 2008Date of Patent: August 13, 2013Assignee: System General CorporationInventors: Shih-Jen Yang, Hung-Sen Tu, I-Hsing Chen, Chen-Chia Yang, Chung-En Chen
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Patent number: 8461737Abstract: Line-start permanent-magnet (LSPM) rotors, rotor components, and machines using LSPM rotors, where the PM rotors have PM bulks in W-like shapes, vent openings between PM bulks, and/or air gaps at ends of PM bulks in the W-like shapes.Type: GrantFiled: November 30, 2009Date of Patent: June 11, 2013Assignee: TECO-Westinghouse Motor CompanyInventors: Xueqing Feng, Lijun Liu
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Publication number: 20120282122Abstract: A rotor (11) with a squirrel cage and permanent magnets (19) mounted on and distributed around the circumference of the rotor, including a core stack extending over the entire rotor region with longitudinally continuous rotor slots extending over the length of the core stack. The squirrel cage is constructed with cage bars disposed, and preferably cast, in the rotor slots; short circuit rings connect the cage bars at both end faces of the core; and the radius of the rotor region is reduced by at least the radial thickness of the magnets. The radius of rotor (11) is reduced over the entire length between short circuit rings (17) such that the radial height of cage bars (15, 29) or cage webs (27) connected thereto is reduced. Also an electric motor or a radial pump having such a rotor, and methods of producing or operating such devices.Type: ApplicationFiled: June 21, 2012Publication date: November 8, 2012Applicant: KSB AktiengesellschaftInventors: Gerhard Huth, Sven Urschel, Ralf Fischer
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Patent number: 7923881Abstract: 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: GrantFiled: May 2, 2008Date of Patent: April 12, 2011Assignee: A.O. Smith CorporationInventors: Dan M. Ionel, Stephen J. Dellinger, Alan E. Lesak, Jeremiah Mattingly
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Patent number: 7659650Abstract: A self magnetizing motor and a compressor having the same is configured to require a lower starting voltage and to deliver superior performance. In the self magnetizing motor, a magnetic material on an exterior of the rotor is magnetized when power is supplied to a magnetizing unit of the stator. A plurality of conductive bars are inserted on the outer circumference of the rotor core. A spacing distance between outer portions of the conductive bars and inner circumference of the magnetizable material is longer than an air gap between the stator and the rotor. As a result, a magnetic strength of the magnetic material may be increased.Type: GrantFiled: September 12, 2007Date of Patent: February 9, 2010Assignee: LG Electronics Inc.Inventors: Sung-Ho Lee, Jae-Hak Choi, Jin-Soo Park
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Patent number: 7619343Abstract: The invention provides a rotor for an electrical motor. The rotor comprises both a squirrel cage and a number of magnets and can be inserted e.g. in a line-start motor. To secure the magnets in cavities in a core of the rotor, an end plate is attached to one axial end face by rivet means, and to simplify manufacturing of the rotor, the rivet means forms part of at least one of the short circuit rings of the squirrel cage.Type: GrantFiled: December 19, 2005Date of Patent: November 17, 2009Assignee: Danfoss Compressors GmbHInventors: Niels Christian Weihrauch, Peter Scavenius Andersen
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Patent number: 7417348Abstract: In the prior art in which permanent magnets are regularly arranged over the whole circumference of a rotor core, a satisfactory magnetic flux distribution is hard to obtain, and the cogging torque and the distortion factor of the induced electromotive force waveform are large, whereby characteristics of a rotating electric machine are poor. Also, because the permanent magnets are arranged over the whole circumference, a large number of permanent magnets are required and cost reduction is difficult. A permanent magnet rotating electric-machine of the invention comprises a stator provided with a plurality of windings, and a rotor in which magnets are disposed in slots formed in a rotor core along an outer circumference thereof, the rotor core being fixed on a rotary shaft rotating inside the stator, and in which one magnetic pole is constituted by each group of three or more of the magnets.Type: GrantFiled: August 8, 2003Date of Patent: August 26, 2008Assignee: Hitachi, Ltd.Inventors: Tsukasa Taniguchi, Hiroyuki Mikami, Satoshi Kikuchi, Fumio Jyoraku, Hideyuki Harada
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Patent number: 7161270Abstract: A line start reluctance synchronous motor includes: a single phase stator arranged at an inner circumferential surface of a motor body and on which a main coil and a sub coil are wound; a magnet unit free-rotatably arranged along an inner circumferential surface of the stator in order to maintain an air gap with the stator; and a cage rotor provided with a rotation shaft at a center portion thereof to be rotatable along an inner circumferential surface of the magnet unit.Type: GrantFiled: January 13, 2004Date of Patent: January 9, 2007Assignee: LG Electronics Inc.Inventors: Seung-Do Han, Hyoun-Jeong Shin, Jun-Ho Ahn