Squirrel Cage Patents (Class 310/156.78)
  • Patent number: 10811917
    Abstract: A rotor capable of improving a torque of an electric motor and a mechanical strength of the rotor. The rotor is provided with a shaft, a plurality of rotor segments that are lined up in the axial direction, and a connecting structure that connects a conductor of a first rotor segment and a conductor of a second rotor segment, which is adjacent to the first rotor segment in the axial direction, and that mechanically connects the first rotor segment and the second rotor segment with each other.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: October 20, 2020
    Assignee: Fanuc Corporation
    Inventor: Tetsumaru Saitou
  • Patent number: 10804832
    Abstract: The invention relates to a control system and to a method for operating a synchronous machine. In particular, the synchronous machine is controlled on the basis of a rotor angle that was determined by means of a sensorless rotor-angle detection method. In order to check the reliability of the rotor angle determined without sensors, the difference value between the rotor inductances in the q direction and in the d direction is monitored. If said difference value falls below a limit value, this indicates possible instabilities in the determination of the rotor angle.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: October 13, 2020
    Assignee: Robert Bosch GmbH
    Inventor: Sebastian Paulus
  • Patent number: 10505411
    Abstract: An electric motor includes a rotor defining a rotation axis, a plurality of permanent magnets arranged circumferentially about the rotor, a cage winding fixed to rotor radially outward of the permanent magnets. A stator is separated from the rotor by an air gap. A plurality of magnetic flux diverters is arranged circumferentially about the stator and adjacent to the air gap to control a magnetic circuit coupling the rotor and the stator.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: December 10, 2019
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Jacek F. Gieras, Gregory I. Rozman
  • Patent number: 10491061
    Abstract: A rotor for a reluctance machine includes a central rotor support rigidly connected to a machine shaft extending laterally along a central axis of the machine. The rotor support has an outer rotor support surface. A non-ferromagnetic channel support is rigidly affixed to the rotor support surface and projects radially relative to the central axis from the rotor support surface to define an outer rotor diameter of the rotor. The rotor also includes an array of arcuate ferromagnetic flux guide channels. The flux guide channels are embedded in the non-ferromagnetic channel support, wherein portions of the channel support abutting the flux guide channels function as non-ferromagnetic flux barriers. The flux barriers provide structural support for the flux guide channels.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: November 26, 2019
    Assignee: General Electric Company
    Inventors: Anoop Jassal, Mohamed Osama, Francesco Papini
  • Patent number: 10461594
    Abstract: A rotor of line start permanent magnet synchronous motor is provided. The rotor includes bars of cage windings. The rotor includes an additional inductance coupled to the cage windings and located on a first end of the bars. The rotor includes an end ring located on a second end of the bars. The additional inductance provides a reactance to reduce a starting current during an asynchronous starting of the line start permanent magnet synchronous motor.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: October 29, 2019
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Jacek F. Gieras, Gregory I. Rozman
  • Patent number: 10389194
    Abstract: A permanent magnet electrical rotating machine is provided which is capable of contributing to protected permanent magnets and increased cooling performance during operation. The permanent magnet electrical rotating machine includes: permanent magnets; rotor cores that have the permanent magnets mounted thereto and are laminated in a rotating axis direction; spacers that are placed between adjacent rotor cores; and permanent magnet protection members that are installed between the permanent magnets and the rotor cores and also placed to maintain radial continuity in space partitioned by the spacers between the rotor cores.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: August 20, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Mamoru Kimura, Masahiro Hori, Youichi Matsumoto, Tetsuo Fujigaki, Motonobu Iiduka, Yoshihiro Yasui, Eiichirou Tokizaki, Masanori Matsumoto
  • Patent number: 9520751
    Abstract: An electrical machine exhibiting reduced friction and windage losses is disclosed. The electrical machine includes a stator and a rotor assembly configured to rotate relative to the stator, wherein the rotor assembly comprises a rotor core including a plurality of salient rotor poles that are spaced apart from one another around an inner hub such that an interpolar gap is formed between each adjacent pair of salient rotor poles, with an opening being defined by the rotor core in each interpolar gap. Electrically non-conductive and non-magnetic inserts are positioned in the gaps formed between the salient rotor poles, with each of the inserts including a mating feature formed an axially inner edge thereof that is configured to mate with a respective opening being defined by the rotor core, so as to secure the insert to the rotor core against centrifugal force experienced during rotation of the rotor assembly.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: December 13, 2016
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Tsarafidy Raminosoa, James Pellegrino Alexander, Ayman Mohamed Fawzi El-Refaie, David A. Torrey
  • Patent number: 9013083
    Abstract: Provided is a permanent magnet type motor including: a rotor including a rotor core and a plurality of permanent magnets; a conducting circuit including a first electric conductor extending in an axial direction of the rotor and being disposed between permanent magnets in a circumferential direction of the rotor and a second electric conductor for connecting the first electric conductors electrically; and a stator disposed so as to be opposed to the rotor, including a stator core and an armature winding. A rotation angle is detected by measuring current flowing in the armature winding. The stator core is formed to have a shape in which, a slot pitch is defined by ?s=(2×?×Rs)/Ns, where an inner radius of the stator is represented by Rs and a number of slots is represented by Ns, a value Wsn obtained by dividing a slot opening width Ws by the slot pitch ?s satisfies “0.08?Wsn”.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: April 21, 2015
    Assignee: Mitsubishi Electic Corporation
    Inventors: Yusuke Morita, Masatsugu Nakano, Sachiko Kawasaki
  • Publication number: 20150084471
    Abstract: 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: Application
    Filed: December 3, 2014
    Publication date: March 26, 2015
    Inventors: Kum Kang Huh, Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Patrick Lee Jansen, Roy David Schultz, Lembit Salasoo
  • Publication number: 20140319951
    Abstract: A slotless amorphous ferroalloy electric machine with radial magnetic circuit and a manufacturing method. The invention includes a stator iron core (21), a cylinder formed by winding an amorphous ferroalloy strip, a stator winding (22) is integrally in the shape of a cylinder and fixed on the internal cylindrical surface of the stator iron core (21), connecting with a metal reinforcing sleeve (25). A radial air gap (5) is arranged between the internal cylindrical surface of the metal reinforcing sleeve (25) and the external surface of a rotor (3). A rotor iron core (31) having a hollow amorphous ferroalloy cylindrical structure and the inner bore wall of the rotor iron core (31) is provided with keyway (312) used for connecting with a electric machine shaft (6) that the radial external surface of the rotor iron core (31) matches with permanent magnets (32).
    Type: Application
    Filed: December 6, 2010
    Publication date: October 30, 2014
    Inventors: Wei Xie, Lei Shi
  • Publication number: 20140285050
    Abstract: A rotor comprises laminations with a plurality of rotor bar slots with an asymmetric arrangement about the rotor. The laminations also have magnet slots equiangularly spaced about the rotor. The magnet slots extend near to the rotor outer diameter and have permanent magnets disposed therein creating magnetic poles. The magnet slots may be formed longer than the permanent magnets disposed therein and define one or more magnet slot apertures. The permanent magnets define a number of poles and a pole pitch. The rotor bar slots are spaced from adjacent magnet slots by a distance that is at least 4% of the pole pitch. Conductive material is disposed in the rotor bar slots, and in some embodiments, may be disposed in the magnet slot apertures.
    Type: Application
    Filed: May 5, 2014
    Publication date: September 25, 2014
    Inventors: Michael J. Melfi, Richard F. Schiferl, Stephen D. Umans
  • Publication number: 20140285051
    Abstract: According to one embodiment, a rotor is configured by a rotor core and magnetic poles. Two or more types of permanent magnets are used such that each product of coercivity and thickness in the magnetization direction becomes different. A stator is located outside the rotor with air gap therebetween and configured by an armature core winding. At least one permanent magnet is magnetized by a magnetic field by a current of the armature winding to change a magnetic flux content thereof irreversibly. A short circuited coil is provided to surround a magnetic path portion of the other permanent magnet excluding the magnet changed irreversibly and a portion adjacent to the other permanent magnet where the magnetic flux leaks. A short-circuit current is generated in the short circuited coil by the magnetic flux generated by conducting a magnetization current to the winding. A magnetic field is generated by the short-circuit current.
    Type: Application
    Filed: June 4, 2014
    Publication date: September 25, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yutaka Hashiba, Kazuto Sakai, Norio Takahashi, Kazuaki Yuuki, Masanori Arata, Yusuke Matsuoka, Motoyasu Mochizuki, Tadashi Tokumasu
  • Publication number: 20140147309
    Abstract: A rotor (2) for an electric motor, which rotor (2) includes a plurality of laminated rotor sheets (4) arranged in layers and each provided with slots (6, 10); a number of permanent magnets (8) arranged within magnet slots (10) in the laminated rotor sheets (4), where an end area (16) of each magnet slot (10) is a magnet free area. The rotor (2) also includes a plurality of rotor bars (14) arranged in rotor bar slots (6) and a rotor sheet band (22) provided between the end area (16) and the adjacent rotor bar slot (6). At least one notch (28, 29) extending from the edge (21) of the rotor bar slot (6) and/or from the edge (21?) of the end area (16) divides the rotor sheet band (22) into a first area (24) and a second area (26). The smallest width (D1) of the first area (24) is smaller than the smallest width (D2) of the second area (26).
    Type: Application
    Filed: March 29, 2012
    Publication date: May 29, 2014
    Inventors: Finn Jensen, Henrik Ørskov Pedersen
  • Publication number: 20130320799
    Abstract: Disclosed in the present invention is a reinforced permanent magnet synchronous motor rotor for line-start, comprising: standard laminations, conductive bars, magnetic bars, and reinforced laminations; the reinforced laminations being located between standard laminations; the magnetic bars are embedded in the standard laminations and separated by the reinforced laminations, and the conductive bars run through the standard laminations and reinforced laminations overlying one other. Comparing the structures of the reinforced permanent magnet synchronous motor rotor for line-start provided by the present invention and the permanent magnet motor rotor in the prior art, the mechanical strength of the motor rotor is increased effectively and the service life of the motor rotor is lengthened by adding reinforced laminations, under the precondition that motor efficiency is not sacrificed.
    Type: Application
    Filed: January 6, 2012
    Publication date: December 5, 2013
    Applicants: Regal Beloit (Suzhou) Co., Ltd., Regal Beloit America, Inc.
    Inventors: Bruce William Kielgas, Kai Wang, Yamin Chen
  • Patent number: 8581468
    Abstract: 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: Grant
    Filed: June 30, 2011
    Date of Patent: November 12, 2013
    Assignee: Denso Corporation
    Inventors: Yuichi Kudose, Yusuke Hara, Takashi Hoshiyama
  • Patent number: 8575813
    Abstract: 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: Grant
    Filed: December 17, 2010
    Date of Patent: November 5, 2013
    Assignee: GM Global Technology Operations LLC
    Inventors: Richard M. Kleber, Michael J. Walker
  • Publication number: 20130278096
    Abstract: A hybrid induction motor includes an inductive rotor and an independently rotating permanent magnet rotor. The inductive rotor is a squirrel cage type rotor for induction motor operation at startup. The permanent magnet rotor is axially displaced and variably coupled to the inductive rotor (or to a motor load) through a clutch and is allowed to rotate independently of the inductive rotor at startup. The independently rotating permanent magnet rotor quickly reaches synchronous RPM at startup. As the inductive rotor approaches or reaches synchronous RPM, the coupling between the inductive rotor and the permanent magnet rotor increases until the two rotors are coupled at the synchronous RPM and the motor transitions to efficient synchronous operation.
    Type: Application
    Filed: November 29, 2012
    Publication date: October 24, 2013
    Inventor: Louis J. Finkle
  • Publication number: 20130154426
    Abstract: A rotor comprises laminations with a plurality of rotor bar slots with an asymmetric arrangement about the rotor. The laminations also have magnet slots equiangularly spaced about the rotor. The magnet slots extend near to the rotor outer diameter and have permanent magnets disposed therein creating magnetic poles. The magnet slots may be formed longer than the permanent magnets disposed therein and define one or more magnet slot apertures. The permanent magnets define a number of poles and a pole pitch. The rotor bar slots are spaced from adjacent magnet slots by a distance that is at least 4% of the pole pitch. Conductive material is disposed in the rotor bar slots, and in some embodiments, may be disposed in the magnet slot apertures.
    Type: Application
    Filed: December 19, 2011
    Publication date: June 20, 2013
    Applicant: Baldor Electric Company
    Inventors: Mike Melfi, Rich Schiferl, Stephen Umans
  • Patent number: 8461737
    Abstract: 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: Grant
    Filed: November 30, 2009
    Date of Patent: June 11, 2013
    Assignee: TECO-Westinghouse Motor Company
    Inventors: Xueqing Feng, Lijun Liu
  • Patent number: 8405272
    Abstract: There is provided a self-starting permanent magnet synchronous motor in which a center axis of magnetic poles of a rotor is assumed to be a d axis, an axis deviated from the magnetic pole center axis by an electric angle of 90 degrees is assumed to be a q axis, at least two or more starting bars which are arranged near the d axis are arranged on a bore side of the bars near the q axis and are arranged in parallel with the q axis, so that a stable starting torque can be generated irrespective of a generating position of a stator magnetic flux which changes due to applying timing of a power source and a phase of a voltage, and a vibration/noises at the time of a stationary operation can be reduced.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: March 26, 2013
    Assignee: Hitachi Appliances, Inc.
    Inventors: Satoshi Kikuchi, Hiroyuki Mikami, Tomio Yoshikawa, Baiying Huang, Hideyuki Kumakura
  • Patent number: 8269438
    Abstract: An apparatus and method for driving a motor of an air conditioner are disclosed. A method for driving a motor of an air conditioner includes driving the motor in response to a predetermined speed command, sequentially detecting first and second mechanical angles in response to the speed command or a reference speed being spaced apart from the speed command by a predetermined range, calculating a maximum speed mechanical angle corresponding to a maximum speed ripple of the motor on the basis of the detected first and second mechanical angles, and compensating for load torque of the motor on the basis of the calculated the maximum speed mechanical angle. As a result, the speed ripple is decreased during the constant speed operation.
    Type: Grant
    Filed: August 5, 2010
    Date of Patent: September 18, 2012
    Assignee: LG Electronics Inc.
    Inventors: Youngho Hong, Yangkwang Choi, Wonseok Kim
  • Publication number: 20120082573
    Abstract: A line-start brushless permanent magnet motor assembly includes an unconventional combination of a rotor assembly including a plurality of permanent magnets mounted thereon, and a stator assembly including aluminum winding coils. The unique combination of construction features leads to significant motor performance enhancements at lower incremental cost. The line-start brushless permanent magnet motor assembly may be incorporated into a hermetic compressor, such as may be used in an air conditioning system, to meet high efficiency standards (e.g., seasonal efficiency energy rating). The disclosed embodiments have an efficiency of at least 90% with winding coils consisting essentially entirely of aluminum.
    Type: Application
    Filed: September 23, 2011
    Publication date: April 5, 2012
    Inventors: Vincent Fargo, Pingshan Cao, Xin Li, Jie Yi
  • Publication number: 20110316468
    Abstract: A rotating electrical machine to be connected to a polyphase power grid, having: a polyphase synchronous motor including a rotor with permanent magnets and a polyphase asynchronous motor axially coupled together, and a switching system arranged so as to electrically connect the asynchronous motor to the grid during the machine starting phase in order to bring the synchronous motor to a speed that enables the motor to operate while connected directly to the grid, and to electrically connect the synchronous motor to the grid during a subsequent phase.
    Type: Application
    Filed: October 22, 2009
    Publication date: December 29, 2011
    Applicant: MOTEURS LEROY-SOMER
    Inventors: Ali Makki, Eric Coupart
  • Patent number: 8072111
    Abstract: A motor, namely, a motor with minimum loss and improved efficiency is disclosed. More specifically, a motor having enhanced starting torque performance and increased normal operation efficiency is disclosed. In the motor in which a rotor is started using induction torque generated as power is supplied to a coil of a stator, the rotor includes a rotor core, a plurality of conductive bars arranged, along a circumferential direction, in an outer rim region of the rotor core, to generate an induction current, magnets provided in the rotor core, to generate a magnetic flux, for generation of a magnetic torque, and end-rings provided at the top and bottom of the rotor core to have no interference with the magnets, the end-rings being connected with the plurality of conductive bars.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: December 6, 2011
    Assignee: LG Electronics Inc.
    Inventors: Hyuk Nam, Sang-Joon Eum
  • Patent number: 8067873
    Abstract: A motor, namely, a motor with minimum loss and improved efficiency is disclosed. More specifically, a motor having enhanced starting torque performance and increased normal operation efficiency is disclosed. In the motor in which a rotor is started using induction torque generated as power is supplied to a coil of a stator, the rotor includes a rotor core, conductive bars arranged, along a circumferential direction, in an outer rim region of the rotor core, to generate an induction current, flux barriers formed in the rotor core, to interrupt flow of a magnetic flux, for generation of reluctance torque, and magnets provided in the rotor core, to generate a magnetic flux, for generation of magnetic torque.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: November 29, 2011
    Assignee: LG Electronics Inc.
    Inventors: Hyuk Nam, Sang-Joon Eum
  • Publication number: 20110249528
    Abstract: A mixer assembly for generating and maintaining a motion within a volume of liquid, the mixer assembly including a motor, a drive shaft and a propeller connected to the drive shaft. When the propeller is in operation, it is driven by the motor and rotates about a propeller axis. The mixer assembly's motor comprises a stator and a hybrid type rotor. The hybrid rotor includes a rotor core comprising an annular radially outer section of asynchronous type and an annular radially inner section of synchronous type arranged radially inside the annular radially outer section.
    Type: Application
    Filed: October 22, 2009
    Publication date: October 13, 2011
    Applicant: ITT Manufacturing Enterprises, Inc.
    Inventors: Katrin Wand, Jürgen Mökander, Rolf Lindeborg, Jörgen Engström, Tanja Hedberg, Thomas Bartholf
  • Publication number: 20110101811
    Abstract: A reconfigurable electric motor includes rotatable permanent magnets in a rotor, the magnets having a first position producing a weak magnetic field and a second position producing a strong magnetic field. The motor is reconfigurable from an asynchronous induction motor at startup into a synchronous motor for efficient operation. The motor includes a squirrel cage for induction motor operation at startup with the permanent magnets positioned to product the weak magnetic field to not interfere with the startup. When the motor reaches sufficient RPM, the permanent magnets rotate to produce a strong magnetic field for high efficiency synchronous operation. The permanent magnets are magnetically biased to come to rest in the weak magnetic field position and a centrifugal mechanism holds the magnets in the weak magnetic field position until sufficient RPM are reached for transition to synchronous operation.
    Type: Application
    Filed: October 30, 2009
    Publication date: May 5, 2011
    Inventors: Louis J. Finkle, Andrea Furia
  • 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
  • Patent number: 7923882
    Abstract: A synchronous machine and a process for manufacturing a synchronous machine having permanent magnets arranged within the rotor such that the leak of magnetic flux generated by the magnets is reduced and having constructive characteristics that maximize the difference in the reluctances of direct axis and quadrature axis while providing the strength necessary for the good functioning of the equipment. Magnet-fixation grooves of the rotor are provided with elongated ends in a curved shape, a first elongated end extending from the first free end to a region adjacent the end of the rotor groove bottom, the first elongated end being configured from an opening in the rotor, forming reluctance-increase channels, a second elongated end of the fixation grooves being configured so as to form the reluctance-increase channel and extending from the respective second free-end portion toward the second free-end portion of the other fixation groove of the pair.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: April 12, 2011
    Assignee: Whirlpool S.A.
    Inventors: Flavio J. H. Kalluf, Milton Bruning
  • Patent number: 7902713
    Abstract: A self-starting type permanent magnet synchronous motor comprises a stator and a rotor. The rotor comprises a rotor core having a plurality of slots provided in an outer periphery thereof and a cage winding comprising conductive bars embedded in the slots and conductive end rings that short-circuit the conductive bars on both end faces of the bars in an axial direction thereof. The rotor core comprises at least one magnet insertion hole arranged on an inner peripheral side from the slots, and at least one permanent magnet embedded in the at least one magnet insertion hole. When a pole center axis is denoted as a d-axis and an axis deviating from the pole center axis by an electrical angle 90° is denoted as a q-axis, a flux content generated by the cage winding during start-up becomes maximal in the vicinity of and on one of the d-axis and the q-axis.
    Type: Grant
    Filed: December 17, 2008
    Date of Patent: March 8, 2011
    Assignee: Hitachi Appliances, Inc.
    Inventors: Satoshi Kikuchi, Hiroyuki Mikami, Akeshi Takahashi, Tomio Yoshikawa, Keiji Tanaka, Masashi Miyake, Baiying Huang, Masaru Ohtahara, Kenji Tojo, Hideyuki Kumakura
  • Patent number: 7895729
    Abstract: A process for mounting magnets in an electric motor rotor and an electric motor rotor, said rotor comprising: a lamination stack (10) provided with a plurality of axial channels (12) disposed around a central axial bore (11) and housing permanent magnets (20); and a rotor cage (30) formed by a pair of end rings (31), each seated against an adjacent end lamination of the lamination stack (10) and interconnected by a plurality of bars (32), said process comprising the steps of: forming an end, ring (31) with at least one inner radial projection (33) disposed radially external to the projection of the contour of an axial channel (12); mounting in each axial channel (12) at least one permanent magnet (20); and deforming each inner radial projection (33) in order to increase its radial extension the sufficient to radially cover at least part of the projection of the contour of said axial channel (12), defining a stop for axially retaining the respective permanent magnet (20).
    Type: Grant
    Filed: June 6, 2005
    Date of Patent: March 1, 2011
    Assignee: Whirlpool S.A.
    Inventors: Gelson Longo, Orlando Starke, Roberto Claudio Hille, Jose Walter Mohr, Arturo Rivio Ramirez
  • Publication number: 20110030419
    Abstract: There is provided a self-starting permanent magnet synchronous motor in which a center axis of magnetic poles of a rotor is assumed to be a d axis, an axis deviated from the magnetic pole center axis by an electric angle of 90 degrees is assumed to be a q axis, at least two or more starting bars which are arranged near the d axis are arranged on a bore side of the bars near the q axis and are arranged in parallel with the q axis, so that a stable starting torque can be generated irrespective of a generating position of a stator magnetic flux which changes due to applying timing of a power source and a phase of a voltage, and a vibration/noises at the time of a stationary operation can be reduced.
    Type: Application
    Filed: August 5, 2010
    Publication date: February 10, 2011
    Inventors: Satoshi KIKUCHI, Hiroyuki MIKAMI, Tomio YOSHIKAWA, Baiying HUANG, Hideyuki KUMAKURA
  • Publication number: 20100295403
    Abstract: Provided is a permanent magnet type motor including: a rotor including a rotor core and a plurality of permanent magnets; a conducting circuit including a first electric conductor extending in an axial direction of the rotor and being disposed between permanent magnets in a circumferential direction of the rotor and a second electric conductor for connecting the first electric conductors electrically; and a stator disposed so as to be opposed to the rotor, including a stator core and an armature winding. A rotation angle is detected by measuring current flowing in the armature winding. The stator core is formed to have a shape in which, a slot pitch is defined by ?s=(2×?×Rs)/Ns, where an inner radius of the stator is represented by Rs and a number of slots is represented by Ns, a value Wsn obtained by dividing a slot opening width Ws by the slot pitch ?s satisfies “0.08?Wsn”.
    Type: Application
    Filed: May 12, 2010
    Publication date: November 25, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yusuke MORITA, Masatsugu Nakano, Sachiko Kawasaki
  • Patent number: 7772736
    Abstract: The inventive self-initiated permanent magnet synchronous motor has a rotor that has two-pole permanent magnets, as well as magnetic substances in a peripheral direction between the magnetic poles of the permanent magnets. The present invention provides a high-efficiency, high-torque permanent magnet synchronous motor with an improved power factor, its rotor, and a compressor using the permanent magnet synchronous motor, without a reduction in the maximum torque and an increase in costs.
    Type: Grant
    Filed: June 5, 2007
    Date of Patent: August 10, 2010
    Assignee: Hitachi Appliances, Inc.
    Inventors: Akeshi Takahashi, Haruo Koharagi, Satoshi Kikuchi, Tomio Yoshikawa, Baiying Huang
  • Publication number: 20100148613
    Abstract: A motor, namely, a motor with minimum loss and improved efficiency is disclosed. More specifically, a motor having enhanced starting torque performance and increased normal operation efficiency is disclosed. In the motor in which a rotor is started using induction torque generated as power is supplied to a coil of a stator, the rotor includes a rotor core, a plurality of conductive bars arranged, along a circumferential direction, in an outer rim region of the rotor core, to generate an induction current, magnets provided in the rotor core, to generate a magnetic flux, for generation of a magnetic torque, and end-rings provided at the top and bottom of the rotor core to have no interference with the magnets, the end-rings being connected with the plurality of conductive bars.
    Type: Application
    Filed: March 7, 2008
    Publication date: June 17, 2010
    Applicant: LG ELECTRONICS INC.
    Inventors: Hyuk Nam, Sang-Joon Eum
  • Patent number: 7737583
    Abstract: A rotor assembly comprising: an inner rotor and an outer rotor for rotating in a magnetic field of a motor, the inner rotor comprising a main inner rotor cavity, and a plurality of first holes being formed between the inner rotor and the outer rotor; two side boards, each side board having a main side board cavity, and being perforated by a plurality of second holes; two damping elements each damping element comprising a main damping element cavity; a plurality of rubber sleeves, each rubber sleeve having a rubber sleeve lip; and a plurality of third holes; an axle; and a plurality of positioning pins.
    Type: Grant
    Filed: August 3, 2008
    Date of Patent: June 15, 2010
    Assignee: Zhongshan Broad-Ocean Motor Co., Ltd.
    Inventor: Ronghua Bi
  • Patent number: 7675204
    Abstract: Disclosed related to provide a motor reliable as capable of controlling the backward rotation of the rotor R for certain. The motor according to the present invention comprises a stator 2; a rotor R rotated by the interaction with between the stator 2 for generating the rotary force of the first rotation direction; a first interference element 32 equipped at the rotor R for rotating in one structure with the rotor R; a second interference element 34 equipped to be engaged with the first interference element 32 as rotated toward the first interference element 32 for controlling the second rotation direction different with the first rotating direction of the rotor R; and a second interference element 34 operating element deliver the rotary force of the rotor R to the second interference element 34 with the magnetism for the second interference element 34 to be rotated toward the first interference element 32 when the rotor R is rotated toward the second rotating direction.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: March 9, 2010
    Assignee: LG Electronics Inc.
    Inventors: Dong Il Lee, Han Gee Kim, Hyoun Jeong Shin
  • Publication number: 20100017037
    Abstract: Provided is an air conditioning system comprised of a plurality of indoor units connected to each other in parallel, each having an expansion valve, and an outdoor unit including a plurality of compressors, in which at least one of the compressors provided to the outdoor unit is a capacity modulation compressor including an electromotive driving unit for driving a plurality of compression units capable of selectively compressing a working fluid, and the electromotive driving unit for the capacity modulation compressor has a stator with a coil wound around thereon and a rotor rotating inside the stator, the rotor being an LSPRM including a rotor core, flux barriers, permanent magnets and conductive bars.
    Type: Application
    Filed: January 15, 2009
    Publication date: January 21, 2010
    Applicant: LG ELECTRONICS INC.
    Inventors: Hyuk Nam, Kang-Wook Lee, Seung-Hyoung Ha, Geun-Hyoung Lee
  • Patent number: 7646125
    Abstract: A rotor of an electric motor, including a rotor core having a plurality of magnet-retaining apertures, a plurality of permanent magnets individually received and retained in the magnet-retaining apertures of the rotor core, and a resinous filler filling a gap defined between each magnet-retaining aperture and each permanent magnet and fixing the permanent magnets to the magnet-retaining apertures. The rotor also includes an engaging projection provided in the rotor core, the engaging projection tightly engaged with each of the permanent magnets received in the magnet-retaining apertures and temporarily holding each permanent magnet at a predetermined position in a corresponding magnet-retaining aperture, in an unfinished state of the rotor where the resinous filler is not arranged in the gap.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: January 12, 2010
    Assignee: Fanuc Ltd
    Inventors: Takashi Okamoto, Takuya Maeda, Makoto Funakubo, Takeshi Tamaki
  • Publication number: 20100001608
    Abstract: Electric machine rotor comprising: an inner rotor element and an outer rotor element positioned more outwards in the radial direction than the inner rotor element, the inner rotor element and the outer rotor element being made of a material of high permeance, and an air gap of low permeance between the inner rotor element and the outer rotor element. The outer rotor element forms a shape-mating pair with the inner rotor element, the inner rotor element and the outer rotor element being shaped in such a way that radial detachment of the outer rotor element from the inner rotor element is prevented.
    Type: Application
    Filed: September 25, 2007
    Publication date: January 7, 2010
    Applicant: ABB OY
    Inventor: Jere Kolehmainen
  • Patent number: 7619343
    Abstract: 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: Grant
    Filed: December 19, 2005
    Date of Patent: November 17, 2009
    Assignee: Danfoss Compressors GmbH
    Inventors: Niels Christian Weihrauch, Peter Scavenius Andersen
  • 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
  • Publication number: 20090200885
    Abstract: The present invention provides a permanent magnet that a fluorine compound is formed on the surfaces of Fe-based magnetic particles, and a recoil permeability is determined in a range of 1.05 to 1.30 by controlling an iron concentration in the fluorine compound to a range of 1 to 50% to reduce a loss due to magnetization rotation, thereby remedying reduction of a residual magnetic flux density and degradation of steady-state characteristics.
    Type: Application
    Filed: December 23, 2008
    Publication date: August 13, 2009
    Inventors: Satoshi Kikuchi, Yuuichi Satsuu, Matahiro Komuro, Hiroyuki Mikami, Akeshi Takahashi
  • Publication number: 20090184598
    Abstract: A rotational angle detection device for a permanent magnet dynamo-electric machine, including: a stator (10); a rotor (20); and a conductive circuit that includes first conductors (1a1, 1a2) extending in a direction parallel to a rotational axis of the rotor and being disposed in at least two places in a circumferential direction of the rotor, and second conductors (1b1, 1b2) for electrically interconnecting the first conductors. In this case, the first conductors are each disposed within a range of an electrical angle between ?45° and +45° in the circumferential direction with a magnetic pole center being set as a reference, and the conductive circuit is disposed in at least one place in the circumferential direction, and the rotational angle detection device further comprising a detection means for detecting a rotational angle of the rotor by measuring a value of a current flowing through the armature winding.
    Type: Application
    Filed: January 9, 2009
    Publication date: July 23, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masatsugu NAKANO, Akira SATAKE, Kanji SHINKAWA, Hiroyuki AKITA, Sachiko KAWASAKI
  • Publication number: 20090160285
    Abstract: A self-starting type permanent magnet synchronous motor comprises a stator and a rotor. The rotor comprises a rotor core having a plurality of slots provided in an outer periphery thereof and a cage winding comprising conductive bars embedded in the slots and conductive end rings that short-circuit the conductive bars on both end faces of the bars in an axial direction thereof. The rotor core comprises at least one magnet insertion hole arranged on an inner peripheral side from the slots, and at least one permanent magnet embedded in the at least one magnet insertion hole. When a pole center axis is denoted as a d-axis and an axis deviating from the pole center axis by an electrical angle 90° is denoted as a q-axis, a flux content generated by the cage winding during start-up becomes maximal in the vicinity of and on one of the d-axis and the q-axis.
    Type: Application
    Filed: December 17, 2008
    Publication date: June 25, 2009
    Inventors: Satoshi Kikuchi, Hiroyuki Mikami, Akeshi Takahashi, Tomio Yoshikawa, Keiji Tanaka, Masashi Miyake, Baiying Huang, Masaru Ohtahara, Kenji Tojo, Hideyuki Kumakura
  • Patent number: 7459814
    Abstract: The hybrid induction motor includes a housing; a stator installed in the housing and having a stator core portion and a stator coil portion; a rotor coupling body having a rotary shaft rotatably installed in at the housing, a cage rotor portion rotating integrally with the rotary shaft, and a permanent magnet rotor portion coupled to a circumference of the cage rotor portion with a certain air gap so as to rotate freely with respect to the rotary shaft; and a reverse rotation preventing switch, when the rotary shaft rotates reversibly, coming in contact with the permanent magnet rotor portion which is moved along the shaft by thrust generated by the rotor coupling body and cutting off power being supplied to the stator coil portion.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: December 2, 2008
    Assignee: LG Electronics Inc.
    Inventors: Dong-Il Lee, Seung-Do Han, Hyoun-Jeong Shin, Jae-Hong Ahn, Seung-Suk Oh
  • Patent number: 7459815
    Abstract: An induction motor having a reverse-rotation preventing function, comprises: a stator provided with a winding coil generating flux by a current; an induction rotor provided with a cage and rotatably inserted in the stator, wherein a rotary shaft is coupled to its inside; a synchronous rotor provided with a permanent magnet and rotatably coupled between the stator and the induction rotor; an induction-force generating unit generating a force for moving the synchronous rotor in an axial direction; and a rotation preventing unit preventing a reverse rotation by fixing the synchronous rotor moved by the induction-force generating unit at the time of reverse rotation of the synchronous rotor.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: December 2, 2008
    Assignee: LG Electronics Inc.
    Inventors: Seung-Do Han, Hyoun-Jeong Shin, Jae-Hong Ahn, Seung-Suk Oh, Dong-Il Lee
  • Patent number: 7453181
    Abstract: A permanent magnet synchronous motor includes a rotor having cage windings and permanent magnets placed on an inner peripheral side of these cage winding bars, where the permanent magnets are placed and polarized so that a ratio ?/? between a circumferential pitch angle ? of magnetic flux distribution of the permanent magnets and a magnet pole pitch angle ? is between 0.67 and 0.91.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: November 18, 2008
    Assignee: Hitachi Appliances, Inc.
    Inventors: Satoshi Kikuchi, Haruo Koharagi, Akeshi Takahashi, Tomio Yoshikawa, Baiying Huang
  • Patent number: 7437882
    Abstract: An apparatus for driving a compressor comprises a compressor having a compression mechanism part for sucking a fluid to compress the same, and an electric motor for driving the compression mechanism part, and an inverter device for driving the electric motor at variable speeds. The electric motor comprises a self-starting type electric motor having a rotor, which comprises a cage conductor and a polarized permanent magnet, and the inverter device comprises a plurality of semiconductor switches for controlling drive frequencies of the electric motor.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: October 21, 2008
    Assignee: Hitachi Air Conditioning Systems Co., Ltd.
    Inventors: Mutsunori Matsunaga, Kenji Tojo, Yoshikatsu Tomita, Susumu Nakayama, Syunsuke Yasunori
  • Publication number: 20080238235
    Abstract: A self-starting permanent magnet synchronous motor which demonstrates satisfactory acceleration performance even at a reduced supply voltage or with an increased load torque, and a compressor using the same. The motor comprises a stator having a stator winding and a rotor having a cage winding and a permanent magnet on the rotor core. The torque component generated by the cage winding is maximal at 1 in the slip range of 0 to 1.
    Type: Application
    Filed: January 25, 2008
    Publication date: October 2, 2008
    Inventors: Akeshi TAKAHASHI, Satoshi Kikuchi, Hiroyuki Mikami, Kazuo Nishihama, Tomio Yoshikawa, Baiying Huang