Corona-prevention Patents (Class 310/196)
  • Patent number: 10424984
    Abstract: A rotating electrical machine includes a plurality of coil conductors, and an insulating tape. The insulating tape is wound around the coil conductors a plurality of times to form an insulating layer. The insulating layer corresponds to at least a part of the coil conductors protruded from the core is provided so that a part of the wound insulating tape is adhered.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: September 24, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Hiroaki Kojima, Kenji Ikeda, Naohiro Hiruta, Daisuke Kamegawa
  • Patent number: 9543800
    Abstract: An external corona shielding for a conductor bar of an electric machine, a main insulating layer sheath on the conductor bar. The shielding has a first ply, which sheaths the main insulating layer, and a second ply, which sheaths the first ply. Each ply is a conductive, impregnatable layer with a sliding layer, wherein the sliding layers of the two plies (20, 21) face one another. Each sliding layer has at least one cutout, wherein the two conductive layers are connected to one another through these cutouts with the aid of a permanently elastic, electrically conductive connection.
    Type: Grant
    Filed: September 26, 2012
    Date of Patent: January 10, 2017
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventors: Mario Brockschmidt, Stefan Kempen, Friedhelm Pholmann, Guido Schmidt, Christian Staubach
  • Patent number: 9431863
    Abstract: An electric machine includes a core with a plurality of teeth that extends between end faces of the core. Slots are defined in the core between adjacent teeth of the plurality of teeth. The slots each have a radial opening formed between end portions of the adjacent teeth. An insulation sheet is positioned on the core to obstruct the radial openings to the slots. The insulation has at least two spaced circumferential members that respectively overlap the end faces of the core. The insulation sheet also has a plurality of spaced axial members connected to the circumferential members. The axial members are positioned within the slots to obstruct the radial openings to the slots.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: August 30, 2016
    Assignee: REMY TECHNOLOGIES, LLC
    Inventors: Chad Zook, Kirk Neet, Scott Bitzer
  • Patent number: 9236725
    Abstract: The present invention provides a hydroelectric turbine system comprising an array of turbines in series and a cabling system for use in connecting together adjacent turbines in the array, the cabling system being designed to allow the majority of the cabling connecting adjacent turbines to be laid substantially in line with the direction of tidal flow in order to reduce stress on the cabling system when the turbines are deployed on the seabed at sites of high tidal flow.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: January 12, 2016
    Assignee: Openhydro IP Limited
    Inventors: James Ives, Paul Dunne, Nick Murphy
  • Patent number: 9059616
    Abstract: The invention discloses an insulation system for a stator bar in high voltage electric machines, comprising an anti-corona tape that is wound uniformly and continuously over the entire length of a bare bar. The anti-corona tape comprises a thin resistive sublayer engaged to a thick insulative sublayer. The insulative sublayer provides resistance against high voltage. The resistive sublayer protects the insulation against partial discharges. These partial discharges can occur in voids, such as delamination voids, transposition crossover gaps, strand corners, slot voids, overlap voids etc. The resistive sublayer also increases the thermal conductivity hence reduces the operating temperature. Such insulation using a single-tape approach can replace several layers used in prior-art, viz., an internal corona protection layer, an external corona protection layer, a stress-grading layer and mica layers. This single-tape approach also simplifies the process of manufacturing the stator bar and reduces its cost.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: June 16, 2015
    Inventor: Dantam K. Rao
  • Patent number: 9035525
    Abstract: According to one embodiment, there is provided a 3-phase 2-pole 2-layer armature winding, housed in 72 slots provided in a laminated iron core, a winding of each phase including six parallel circuits separated into two phase belts. Upper coil pieces of first and fourth parallel circuits are placed at 3rd, 4th, 7th, and 12th positions, and lower coil pieces of the first and fourth parallel circuits are placed at 1st, 6th, 9th, and 10th positions, upper and lower coil pieces of second and fifth parallel circuits are placed at 2nd, 5th, 8th, and 11th positions, and upper coil pieces of third and six parallel circuits are placed at 1st, 6th, 9th, and 10th positions, and lower coil pieces of the third and six parallel circuits are placed at 3rd, 4th, 7th, and 12th positions, from the center of a pole.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: May 19, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tadashi Tokumasu, Masafumi Fujita, Takashi Ueda, Mikio Kakiuchi
  • Publication number: 20150115763
    Abstract: Fewer insulation layers can be used by virtue of using hydrophobic electrically conductive materials around a main insulation around a conductive bar. There are several more layers of conductive and/or non-conductive material.
    Type: Application
    Filed: March 14, 2013
    Publication date: April 30, 2015
    Inventors: Mario Brockschmidt, Peter Gröppel, Friedhelm Pohlmann, Claus Rohr, Roland Röding, Julia Wirsing
  • Publication number: 20150042195
    Abstract: A corona shield material (22) for producing a corona shield protective layer (16, 17) for an electric machine (1). The corona shield material (22) contains an initially flowable matrix material (22) which can be cured in a curing reaction to form a solid. The corona shield material (22) further contains a photosensitive initiator (24) which can be transformed by electromagnetic radiation (25) into a reactive state triggering the curing reaction. The corona shield material (22) further contains at least one electrically conductive filler (25) in particulate form.
    Type: Application
    Filed: March 18, 2013
    Publication date: February 12, 2015
    Inventors: Mario Brockschmidt, Stefan Kempen, Friedhelm Pohlmann, Guido Schmidt
  • Publication number: 20150008782
    Abstract: An end winding corona protection including a winding of a rotating electric machine, having a conductor and a groundwall insulation surrounding the conductor, an end winding corona protection arranged on the outer surface of the groundwall insulation, the end winding corona protection comprising a first layer characterized in that the surface resistance of the first layer is in the range of 10 Ohm to 80 Ohm, and in that the end winding corona protection further comprises a second layer arranged on the outer surface of the first layer, wherein the second layer is made of semiconductive material, and wherein third layer is arranged on the outer surface of the second layer and made of medium resistive material.
    Type: Application
    Filed: June 26, 2014
    Publication date: January 8, 2015
    Inventors: Andreas Koepfler, Jeremy Poux, Thomas Lugand
  • Publication number: 20150001983
    Abstract: The invention relates to a corona shield for an electrical conductor in a rotating electric machine, comprising an outer corona shield and a terminal corona shield which is mounted adjacent to the outer corona shield, on a high-voltage insulation of the electrical conductor, and also comprising a strip that has a limited electrical conductivity, is arranged around the high-voltage insulation of the electrical conductor, and is impregnated with a resin. The invention is characterized in that a paint having a limited electrical conductivity is arranged at least between the high-voltage insulation and the strip, in the transition zone between the outer corona shield and the strip of the terminal corona shield.
    Type: Application
    Filed: November 23, 2012
    Publication date: January 1, 2015
    Applicant: Voith Patent GmbH
    Inventors: Thomas Hildinger, Ludger Kodding, Marcelo Jacob Da Silva, Joao Fiorini Cordeiro, Camila Dos Santos Goncalves
  • Publication number: 20140327334
    Abstract: The corona shield can be applied in electric machines in a faster manner by using radiation-cured materials.
    Type: Application
    Filed: December 15, 2011
    Publication date: November 6, 2014
    Inventors: Mario Brockschmidt, Stefan Kempen, Friedhelm Pohlmann, Guido Schmidt
  • Patent number: 8872405
    Abstract: An insulated stator coil (16) is provided comprising a plurality of coil strands (18) having a top surface (24) and a bottom surface (26). A filler material (30) is disposed on the top surface (24) and the bottom surface (26) of the plurality of coil strands (18) to smooth discontinuities at the top and bottom surfaces (24, 26). A conductive cap (32, 34) disposed over each of the top and bottom surfaces (24, 26) of the plurality of coil strands (18). A conductive strip (46) is disposed between the filler material (30) and each respective conductive cap (32, 34). The conductive strip (46) is effective to lower a resistivity of the conductive caps (32, 34) such that partial discharges do not occur in the insulated stator coil (16).
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: October 28, 2014
    Assignee: Siemens Energy, Inc.
    Inventor: Franklin T. Emery
  • Patent number: 8841811
    Abstract: An electric machine includes a core with a plurality of slots. Electric conductors are positioned within the slots with connection ends extending from the in-slot portions. A plurality of insulation sleeves separate the plurality of electric conductors. Each insulation sleeve substantially covers one entire conductor, including the in-slot portions and the connection ends of the conductor. A tip portion on each connection end remains uncovered by the insulation sleeve and is electrically connected to another tip portion on another conductor. Air passages are formed between the plurality of insulation sleeves at the in-slot portions and at the connection ends of the plurality of electric conductors.
    Type: Grant
    Filed: August 18, 2010
    Date of Patent: September 23, 2014
    Assignee: Remy Technologies LLC
    Inventor: Michael Bradfield
  • Publication number: 20140246941
    Abstract: An external corona shielding for a conductor bar of an electric machine, a main insulating layer sheath on the conductor bar. The shielding has a first ply, which sheaths the main insulating layer, and a second ply, which sheaths the first ply. Each ply is a conductive, impregnatable layer with a sliding layer, wherein the sliding layers of the two plies (20, 21) face one another. Each sliding layer has at least one cutout, wherein the two conductive layers are connected to one another through these cutouts with the aid of a permanently elastic, electrically conductive connection.
    Type: Application
    Filed: September 26, 2012
    Publication date: September 4, 2014
    Inventors: Mario Brockschmidt, Stefan Kempen, Friedhelm Pholmann, Guido Schmidt, Christian Staubach
  • Patent number: 8664825
    Abstract: Provided is a molded motor that hardly causes electric corrosion in bearings and produces less noise and vibration. Electrical continuity between a bracket 51 on an output side and a bracket 52 on a counter output side is secured by a conductive plate 60 having elasticity. Therefore, since the conductive plate 60 is unlikely to be cut off by an external force and does not change significantly with time, the electrical continuity between the bracket 51 on the output side and the bracket 52 on the counter output side is hardly interrupted. Accordingly, since a difference in potential between the bracket 51 on the output side and the bracket 52 on the counter output side hardly occurs, electric corrosion is hardly caused in a bearing 41 on the output side and a bearing 42 on the counter output side.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: March 4, 2014
    Assignee: Fujitsu General Limited
    Inventors: Tsugiyoshi Ono, Kazuyoshi Watanabe
  • Patent number: 8536756
    Abstract: A motor includes a stator having a stator iron-core on which a winding is wound, a rotor having a rotary body holding a permanent magnet opposed to the stator along a circumferential direction and a shaft joined to the rotary body such that it extends through the rotary body at the center, bearings supporting the shaft, two conductive brackets for fixing the bearings, and a printed circuit board on which a drive circuit for driving the winding is mounted. A dielectric layer is provided between an outer wall of the rotary body and the shaft, the two brackets are electrically connected together, and a capacitor is connected between the stator iron-core and the brackets for adjusting impedance.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: September 17, 2013
    Assignee: Panasonic Corporation
    Inventors: Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa, Haruhiko Kado
  • Publication number: 20130221790
    Abstract: An insulation system and method are disclosed for insulating formed coils of electrical machines, such as motors and generators. The system includes strand/turn insulation that may include one or more layers of different materials, depending upon the dielectric requirements. A ground wall insulation is applied over the group of turns. The coil may be sized in a slot cell section. Additional insulation layers are provided, including a slot corona suppression insulation that extends just beyond stator slots, a voltage grading layer, and an armor layer. The resulting system is highly adaptable to different machine designs and ratings, and affords superior resistance to degradation.
    Type: Application
    Filed: February 22, 2013
    Publication date: August 29, 2013
    Applicant: Integrated Power Services LLC
    Inventor: Integrated Power Services LLC
  • Publication number: 20130193796
    Abstract: An insulated stator coil (16) is provided comprising a plurality of coil strands (18) having a top surface (24) and a bottom surface (26). A filler material (30) is disposed on the top surface (24) and the bottom surface (26) of the plurality of coil strands (18) to smooth discontinuities at the top and bottom surfaces (24, 26). A conductive cap (32, 34) disposed over each of the top and bottom surfaces (24, 26) of the plurality of coil strands (18). A conductive strip (46) is disposed between the filler material (30) and each respective conductive cap (32, 34). The conductive strip (46) is effective to lower a resistivity of the conductive caps (32, 34) such that partial discharges do not occur in the insulated stator coil (16).
    Type: Application
    Filed: February 1, 2012
    Publication date: August 1, 2013
    Inventor: Franklin T. Emery
  • Patent number: 8421302
    Abstract: According to one embodiment, there is provided a rotating electrical machine including a core, a coil extending from the core, and an electromagnetic shield which is provided outside the core, and has a plurality of shoulders projecting toward the coil. The coil includes an insulator covering outside of a conductor, a resistance layer formed on a surface of the insulator and contacting the core, and at least one potential grading layer formed on a surface of the insulator adjacent to the resistance layer. A boundary between the resistance layer and potential grading layer is provided at a position farther from the core than a point on a surface of the coil, where a distance between the coil and a shoulder of the electromagnetic shield closest to the core is the shortest.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: April 16, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takashi Harakawa, Tetsushi Okamoto, Yoshiyuki Inoue, Tooru Ootaka, Hiroshi Hatano, Mikio Kakiuchi, Toshihiko Shinoda, Makoto Kawahara, Masashi Kobayashi, Wataru Nakamura, Ken Nagakura, Masamitsu Sakuma
  • Patent number: 8395296
    Abstract: A wrapped stator coil for use in a generator. The wrapped stator coil includes an electrical conductor bar, a laminate tape structure, and a conductive structure. The laminate tape structure is disposed about the electrical conductor bar and includes an insulative first layer adjacent the conductor bar and a conductive second layer bonded to the first layer. The conductive structure includes a first end portion, an intermediate portion and a second end portion. The first end portion is in contact with the electrical conductor bar. The intermediate portion is in contact with the conductive second layer and is not in contact with the electrical conductor bar. The insulating layer is disposed about the conductive structure and the laminate tape.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: March 12, 2013
    Assignee: Siemens Energy, Inc.
    Inventor: Franklin T. Emery
  • Patent number: 8288911
    Abstract: An electrical machine including a winding made of a conductive material is disclosed. The electrical machine also includes an insulating layer disposed around at least a portion of the winding having a dielectric constant that varies as a function of voltage.
    Type: Grant
    Filed: December 15, 2006
    Date of Patent: October 16, 2012
    Assignee: General Electric Company
    Inventors: Qi Tan, Patricia Chapman Irwin, Manoj Ramprasad Shah, Yang Cao, Abdelkrim Younsi, Michael Francis Ciccarelli, Christina Lea McHugh
  • Patent number: 8278795
    Abstract: A voltage grading structure (40) as may be used in the stator coils of an electromotive machine is provided. A filler material (44) may be disposed on a top surface and a bottom surface of a stack of coil strands (22). The voltage grading structure may include an electrical isolation layer (46) on the filler material and may further include an electrically conductive layer (48) on the electrical isolation layer. An electrically conductive bar (50) is positioned on the electrically conductive layer. The conductive bar is electrically connected to at least one of the coil strands (22) to shunt a capacitance effect between the conductive layer and the stack of coil strands and force the conductive layer to be substantially at a common voltage level relative to the stack of coil strands and thereby avoid an overvoltage condition.
    Type: Grant
    Filed: September 18, 2009
    Date of Patent: October 2, 2012
    Assignee: Siemens Energy, Inc.
    Inventor: Franklin T. Emery
  • Publication number: 20120093666
    Abstract: Systems and methods for insulating the Y-points of three-phase electric motors commonly used in ESP systems, in which the Y-points are not grounded or tied to a reference voltage, and may consequently experience high voltages. One embodiment is an apparatus for insulating the Y-point of the motor using an electrically insulating enclosure. The enclosure has apertures that extend from a cavity therewithin the to the exterior of the enclosure. The cavity accommodates the Y-point of the motor. The conductors which are connected at the Y-point junction extend from the cavity to the coils of the three-phase motor, and possibly to an instrument package. Seals are formed at the apertures to provide an electrically insulating barrier between the Y-point and the exterior of the enclosure. The cavity may be filled with an insulating material such as potting compound or oil.
    Type: Application
    Filed: October 19, 2010
    Publication date: April 19, 2012
    Inventor: John M. Knapp
  • Patent number: 8044550
    Abstract: A Roebel bar for a rotating electrical machine includes a straight slot part disposed in a slot in an iron sheet of a stator of the rotating electrical machine and a bent yoke part adjacent to the straight slot part and protruding from the stator, wherein the bent yoke part is configured to connect the Roebel bar to at least one more Roebel bar so as to form a winding. A copper conductor disposed in the straight slot part and the bent yoke part is surrounded by an insulation having an outer surface. A slot corona shielding includes an electrically conductive layer disposed on the outer surface of the insulation in an area of the straight slot part. A yoke corona shielding includes a semiconducting layer disposed on the outer surface of the insulation in an area of the bent yoke part.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: October 25, 2011
    Assignee: Alstom Technology Ltd
    Inventor: Thomas Baumann
  • Publication number: 20110062816
    Abstract: A wrapped stator coil for use in a generator. The wrapped stator coil includes an electrical conductor bar, a laminate tape structure, and a conductive structure. The laminate tape structure is disposed about the electrical conductor bar and includes an insulative first layer adjacent the conductor bar and a conductive second layer bonded to the first layer. The conductive structure includes a first end portion, an intermediate portion and a second end portion. The first end portion is in contact with the electrical conductor bar. The intermediate portion is in contact with the conductive second layer and is not in contact with the electrical conductor bar. The insulating layer is disposed about the conductive structure and the laminate tape.
    Type: Application
    Filed: September 16, 2009
    Publication date: March 17, 2011
    Inventor: Franklin T. Emery
  • Patent number: 7863794
    Abstract: There is provided a 3-phase 2-layer armature winding of a rotating electrical machine. The lead-out connection conductor connected to the output terminal is connected to a coil piece positioned at least farther than a first coil piece inside the phase belt counted from the end of the each phase belt, and a coil piece positioned at the end of the phase belt is connected to a coil piece positioned at least farther than the n-th (n is an integer larger than 1) inside the phase belt counted from the other end of the phase belt in the same parallel circuit, by a jumper wire.
    Type: Grant
    Filed: July 12, 2010
    Date of Patent: January 4, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masafumi Fujita, Tadashi Tokumasu, Mikio Kakiuchi, Hiroshi Hatano, Takashi Ueda, Ken Nagakura
  • Patent number: 7804218
    Abstract: When a rotating electrical machine winding is inserted into a slot with a protective insulation intervening between them, a semiconductive insulating layer is lap-wound between an interlayer insulating layer of the rotating electrical machine winding and the protective insulation, the semiconductive insulating layer being formed by center-folding a continuous semiconductive sheet in the longitudinal direction. A thermal stress relaxation layer is provided inside the center-folded continuous semiconductive sheet so that thermal stress exerted in thickness direction of the insulating layers is absorbed.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: September 28, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Higashimura, Yoshimi Kurahara, Hiroshi Miyao, Keiji Suzuki, Mitsuru Onoda, Nobuaki Tanaka
  • Patent number: 7781933
    Abstract: The present invention is intended to provide a winding arrangement of single star connection for a rotating electrical machine, capable of enhancing insulation performance in coils of the same phase. In such winding arrangement, a first coil U1 to a sixth coil U6 are formed respectively in coil arranging parts 1U to 6U. Next, a coil arranging part 7U is skipped and the seventh coil U7 is formed in a coil arranging part 8U. Then, a coil formed at the end of winding (eighth coil U8) is formed in the skipped coil arranging part 7U.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: August 24, 2010
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Satoshi Koide, Yasuhiko Ishimaru, Hiroshi Hattori
  • Publication number: 20100187025
    Abstract: There is provided a motor insulation protecting device 200 comprising a motor 40 installed in a motor chamber 14; an inverter 16 that supplies an inverter voltage for driving the motor 40; and pressurizing means for monitoring an internal pressure in the motor chamber 14 and the inverter voltage of the inverter 16, and increasing the pressure in the motor chamber when an occurrence of discharge of the motor is predicted, wherein the pressurizing means comprises a pressure detection unit 50 that detects the internal pressure in the motor chamber 14; a voltage detection unit that is provided in a control unit 60, and detects the inverter voltage of the inverter 16; and a pressurizing mechanism 70 that increases the pressure in the motor chamber 14 in accordance with the output from the control unit 60 when the detected internal pressure is lower than a preset discharge occurrence prediction internal pressure, and the detected inverter voltage is higher than a preset discharge occurrence prediction inverter volt
    Type: Application
    Filed: May 20, 2008
    Publication date: July 29, 2010
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Naoyoshi Takamatsu, Daigo Kikuta
  • Publication number: 20100181861
    Abstract: In a motor device 300 mounted on a mobile body, a pressurizing mechanism for increasing the pressure in a motor chamber 14 in which a motor is installed has a compressor 30, which is driven to rotate by an engine 20 serving as driving means for driving the mobile body, to produce compressed air for motor chamber pressurization, and the compressed air coming from the compressor 30 is fed into the motor chamber 14 through a pipe 72 almost constantly while the engine 20 is being driven.
    Type: Application
    Filed: May 23, 2008
    Publication date: July 22, 2010
    Inventors: Naoyoshi Takamatsu, Daigo Kikuta
  • Patent number: 7741748
    Abstract: A device for improving the protection of a component against surface discharges includes a non-woven substrate made of fibers and configured to be electrically insulating and a coating containing silicon carbide (SiC) disposed on the substrate.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: June 22, 2010
    Assignee: Alstom Technology Ltd
    Inventor: Thomas Baumann
  • Publication number: 20100134061
    Abstract: A system for automatically detecting corona effects in operating dynamic electromechanical equipment may include: at least one sensor connected to operating dynamic electromechanical equipment, a controller connected to the at least one sensor and to the operating dynamic electromechanical equipment; and a corona phenomena detection device. The at least one sensor may be adapted to measure behavior of emitted signals of the operating dynamic electromechanical equipment. The controller may be adapted to adjust emitted signals of the operating dynamic electromechanical equipment to correct for errors detected by the sensor in the emitted signals The corona phenomena detection device may be adapted to automatically detect corona effects of the dynamic electromechanical equipment. The corona phenomena detection device may be connected to, or embedded in, the dynamic electromechanical equipment during manufacture of the dynamic electromechanical equipment, or retrofitted to the dynamic electromechanical equipment.
    Type: Application
    Filed: December 1, 2008
    Publication date: June 3, 2010
    Inventor: ALI REZA MANSOURI
  • Publication number: 20100079027
    Abstract: A Roebel bar for a rotating electrical machine includes a straight slot part disposed in a slot in an iron sheet of a stator of the rotating electrical machine and a bent yoke part adjacent to the straight slot part and protruding from the stator, wherein the bent yoke part is configured to connect the Roebel bar to at least one more Roebel bar so as to form a winding. A copper conductor disposed in the straight slot part and the bent yoke part is surrounded by an insulation having an outer surface. A slot corona shielding includes an electrically conductive layer disposed on the outer surface of the insulation in an area of the straight slot part. A yoke corona shielding includes a semiconducting layer disposed on the outer surface of the insulation in an area of the bent yoke part.
    Type: Application
    Filed: September 29, 2009
    Publication date: April 1, 2010
    Applicant: ALSTOM TECHNOLOGY LTD
    Inventor: Thomas Baumann
  • Publication number: 20090243419
    Abstract: A method for measuring a tangential tightness of a stator coil within an armature slot of a stator assembly in an electric generator. The stator coil is excited to produce a vibratory response therein. The vibratory response of the stator coil is detected and a frequency response function of the vibratory response is determined. A tangential tightness of the stator coil within the armature slot is estimated based on the frequency response function of the vibratory response of the stator coil.
    Type: Application
    Filed: March 26, 2008
    Publication date: October 1, 2009
    Applicant: SIEMENS POWER GENERATION, INC.
    Inventors: Benjamin T. Humphries, Constance M. Smith, James F. Lau
  • Publication number: 20090184600
    Abstract: A conductor bar for a rotating electrical machine has an inner conductor with an essentially rectangular cross section sheathed in a straight section of the conductor bar by mica tape insulation.
    Type: Application
    Filed: January 21, 2009
    Publication date: July 23, 2009
    Applicant: ALSTOM Technology Ltd.
    Inventor: Thomas Baumann
  • Publication number: 20080231136
    Abstract: An electrical rotating machine wherein the coil end portion and slot straight portion of a coil conductor are coated with insulation layers respectively. The insulation layers are different in thickness or insulation material, and an electric field lessening layer is coated on the coil conductor or the insulation layers.
    Type: Application
    Filed: January 25, 2008
    Publication date: September 25, 2008
    Inventor: Koji OBATA
  • Publication number: 20080143209
    Abstract: An electrical machine including a winding made of a conductive material is disclosed. The electrical machine also includes an insulating layer disposed around at least a portion of the winding having a dielectric constant that varies as a function of voltage.
    Type: Application
    Filed: December 15, 2006
    Publication date: June 19, 2008
    Inventors: Qi Tan, Patricia Chapman Irwin, Manoj Ramprasad Shah, Yang Cao, Abdelkrim Younsi, Michael Francis Ciccarelli, Christina Lea McHugh
  • Publication number: 20080106157
    Abstract: When a rotating electrical machine winding is inserted into a slot with a protective insulation intervening between them, a semiconductive insulating layer is lap-wound between an interlayer insulating layer of the rotating electrical machine winding and the protective insulation, the semiconductive insulating layer being formed by center-folding a continuous semiconductive sheet in the longitudinal direction. A thermal stress relaxation layer is provided inside the center-folded continuous semiconductive sheet so that thermal stress exerted in thickness direction of the insulating layers is absorbed.
    Type: Application
    Filed: November 7, 2007
    Publication date: May 8, 2008
    Inventors: Yutaka Higashimura, Yoshimi Kurahara, Hiroshi Miyao, Keiji Suzuki, Mitsuru Onoda, Nobuaki Tanaka
  • Publication number: 20080007133
    Abstract: An electromagnetic device includes a plurality of coils formed by winding conductors. At least some of the conductors are constructed by stacking conductor constructional elements so that an eddy current generated by a leakage flux linked to the conductor is divided. An outer insulating member is disposed on an outer circumferential surface of the conductor stack for electrically insulating the conductor stack from another member. An inner insulating member whose thickness is smaller than a thickness of the outer insulating member is disposed between the conductor constructional elements adjoining to each other in the same conductor stack.
    Type: Application
    Filed: July 5, 2007
    Publication date: January 10, 2008
    Applicant: NIPPON SOKEN, INC.
    Inventors: Sadahisa Onimaru, Hirofumi Kinjou, Katsuhiko Oka, Daisuke Miyata
  • Patent number: 7259491
    Abstract: A rotating asynchronous converter and a generator device having a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter has a rotor which rotates in dependence of the first and second frequencies f1, f2. The stators each have at least one winding formed of at least one current-carrying conductor, and an insulation system, formed of semiconducting layers each forming an equipotential surface, and a solid insulation between the semiconducting layers.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: August 21, 2007
    Assignee: ABB AB
    Inventors: Mats Leijon, Thorsten Shütte, Christian Sasse, Udo Fromm, Stefan G. Johansson
  • Patent number: 7126235
    Abstract: A wind-power unit has a wind turbine has an electric generator connected to the wind turbine. The stator of the generator has a winding formed of a high-voltage cable having a core of conducting material, a first layer of semiconducting material surrounding the core, an insulating layer of solid material surrounding the first layer, and a second layer of semiconducting material surrounding th solid insulation. The wind turbine has a plurality of turbine blades running vertically and being connected to a turbine shaft. The generator is arranged at the lower end of the turbine shaft. A wind-power plant; the use of a wind-power unit; and a method of generating electric power are described.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: October 24, 2006
    Assignee: Swedish Vertical Wind AB
    Inventors: Hans Bernhoff, Mats Leijon
  • Patent number: 7088027
    Abstract: The present invention relates to a rotating asynchronous converter and a generator device. The converter comprises a first stator connected to a first AC network with a first frequency f1, and a second stator connected to a second AC network with a second frequency f2. The converter also comprises a rotor means which rotates in dependence of the first and second frequencies f1, f2. The stators each comprises at least one winding, wherein each winding comprises at least one current-carrying conductor, and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: August 8, 2006
    Assignee: ABB AB
    Inventors: Mats Leijon, Thorsten Schütte, Christian Sasse, Udo Fromm
  • Patent number: 7061133
    Abstract: The magnetic circuit of a generator in a wind power plant is arranged to directly supply a high supply voltage of 2-50 kV, preferably higher than 10 kV. The generator is provided with solid insulation and its winding includes a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The stator winding may be produced with full or fractional slot winding, the phases of the winding being Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arrestors, or else the Y-point may be earthed via a suppression filter. The invention also relates to a wind power plant, a generator included in the plant and a variable speed system for such a plant.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: June 13, 2006
    Assignee: ABB AB
    Inventors: Mats Leijon, Gunnar Kylander
  • Patent number: 7019429
    Abstract: A method for mounting a tube in a space having a shape corresponding to the shape of the tube. The tube is inserted into the space, pressurized with a hot pressure medium causing the tube to expand until the space is filled, then a cold pressure medium is substituted for the hot pressure medium while maintaining constant pressure causing the tube to solidify in its expanded shape. Also, a rotating electric machine having such a tube between windings of a high-voltage cable in a stator slot.
    Type: Grant
    Filed: November 27, 1998
    Date of Patent: March 28, 2006
    Assignee: Asea Brown Boveri AB
    Inventors: Bertil Larsson, Bengt Rothman
  • Patent number: 6981308
    Abstract: A rotating electric machine (1) has a rotor, a stator (2), and stator windings (3, 4). The windings (3, 4) include high voltage cable drawn through slots (5, 6) in the stator (2). Support members (8) are arranged inside the slots (5, 6) along and in contact with the windings (3, 4), said support members (8) comprising a hose (8?) with a substantially triangular cross-section. A wire (9) is extending through and being attached to each support member (8). When mounting the support members (8) air inside a support member (8) is evacuated in order to shrink the support member (8). Then the wire (9) extending through the support member (8) is used to pull the evacuated support member (8) into a slot (5, 6), whereupon the evacuated support member (8) is expanded by releasing the vacuum inside in order to make it clamp a cable inside a slot (5, 6) of the stator (2).
    Type: Grant
    Filed: August 11, 2003
    Date of Patent: January 3, 2006
    Assignee: ALSTOM Technology LTD
    Inventors: Olof Lundeberg, Pentti Virtanen
  • Patent number: 6972505
    Abstract: A rotating electrical machine and method for making the machine, where the machine includes a high-voltage stator winding and elongated support devices for supporting the winding. The machine and method employ an arrangement of cable that is made of inner conductive strands, covered with a first semiconducting layer, which is covered with an insulating layer, which is covered with a second semiconducting layer. The cable is wound in slots in the stator such that separate cable lead-throughs are positioned in specific arrangements with respect to each other and in slots of the stator. The arrangement of the cable in the stator protects the integrity of the respective components in the cable and particularly the second semiconducting layer.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: December 6, 2005
    Assignee: ABB
    Inventors: Mats Leijon, Peter Templin, Bengt Rydholm, Lars Gertmar, Bertil Larsson, Bengt Rothman, Peter Carstensen, Leif Johansson, Claes Ivarson, Bo Hernnas, Goran Holmstrom, Bengt Goran, Alberti Backlund
  • Patent number: 6960859
    Abstract: A Roebel bar (10) for an electrical machine comprises a plurality of essentially parallel, transposed conductor elements (11, 12, 13), which, lying over and/or next to one another, form a bar with an essentially rectangular cross section, which is surrounded on the outside by an insulation (19) and has between the insulation (19) and the conductor elements (11, 12, 13) means (14, 14?; 15, 15?; 17, 18) for forming an inner corona protection (ICP). In the case of such a Roebel bar, particularly effective inner corona protection is achieved by the fact that the means for inner corona protection comprise preformed, angled profiles (17, 18) of an electrically conducting material, which, running in the longitudinal direction of the Roebel bar (10), enclose the edges of the bar formed by the conductor elements (11, 12, 13), and to which the insulation (19) is applied.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: November 1, 2005
    Assignee: Alstom Technology LTD
    Inventors: Thomas Baumann, Peter Klee
  • Patent number: 6940203
    Abstract: A corona suppression apparatus for a dynamoelectric machine having a stator coil (12) covered with a corona suppression covering (16), the apparatus including a member (10) conducting to ground (20) abutting a top layer (28) of the corona suppression covering proximate an overlap region (18) of the corona suppression covering. The member may be positioned in a gap (30) between the stator coil corona suppression covering and a stator core clamping finger (24) extending from the stator core proximate the stator coil. The member may also be configured to exert a compressive force on the overlap region by being compression biased between the corona suppression covering and the stator core clamping finger.
    Type: Grant
    Filed: October 23, 2003
    Date of Patent: September 6, 2005
    Assignee: Siemens Westinghouse Power Corporation
    Inventors: Viktor Kogan, James R. Pipkin
  • Patent number: 6936947
    Abstract: In a plant containing a turbo-generator the magnetic circuit of the turbo-generator is included in an electric generator which directly supplies a high supply voltage of 20-800 kV, preferably higher than 36 kV. The insulation of the generator is built up of a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by outer and inner semiconducting layers (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The phases of the winding are Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: August 30, 2005
    Assignee: ABB AB
    Inventors: Mats Leijon, Peter Templin, Claes Ivarson, Lars Gertmar, Peter Carstensen, Bertil Larsson, Sören Berggren, Erland Sörensen, Bertil Berggren, Gunnar Kylander, Mons Hölleland
  • Patent number: 6919664
    Abstract: In a plant comprising one or more electric machines constructed with insulated conductors and connected for heavy current via insulated conductors, the magnetic circuit in at least one of these electric machines is connected directly to a high supply voltage of 20-800 kV, preferably higher than 36 kV. The insulation of the electric machine is built up of a cable (6) placed in its winding and comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by outer and inner semiconducting layers (34, 32) and intermediate insulating layers (33). The conductors (31) may be group-wise connected in parallel and semiconducting layers are therefore not required around every conductor in the group.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: July 19, 2005
    Assignee: ABB AB
    Inventors: Mats Leijon, Lars Gertmar, Lennart Brandt