Removable Pole Patents (Class 310/216.079)
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Patent number: 10559987Abstract: An electromagnetic armature comprising an electromagnetic yoke having a cylindrical surface of axis z, intended to be facing an air-gap. Said cylindrical surface is the interaction surface and comprises a plurality of teeth forming poles, associated with the interaction surface and projecting from same, and disposed at regularly spaced intervals around the whole yoke. Each tooth comprises a recess arranged on one of the faces of the tooth in a so-called polar plane. Each recess is intended to receive the winding. Said teeth are disposed on the yoke in such a way that the recesses are disposed alternately to either side of the polar plane. Alternatively, one or more teeth of the armature can be removed from the yoke.Type: GrantFiled: November 29, 2017Date of Patent: February 11, 2020Assignee: Francecol TechnologyInventors: François Bernot, Victor Ivan Bernaola Mendoza, Rodret Charles Mbikou Moutsinga
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Patent number: 9577480Abstract: A rotor includes a plurality of salient poles, each of which is formed by a plurality of plate members including steel plates that are stacked together, provided extending in a radial direction and around which a coil is wound. The plurality of salient poles has auxiliary salient poles that protrude from the salient poles between two salient poles that are adjacent to one another. The auxiliary salient poles are formed by only a first plate member that is a portion of plate members that forms the salient poles.Type: GrantFiled: November 28, 2012Date of Patent: February 21, 2017Assignee: Toyota Jidosha Kabushiki KaishaInventors: Eiji Yamada, Ryoji Mizutani, Shintaro Chinen, Kenji Hiramoto, Hideo Nakai
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Patent number: 9153946Abstract: A power distribution contactor mount, and a power distribution system incorporating the same, include a plurality of electrically and thermally conductive contactor posts operable to connect a contactor lead to a bus bar, a mounting panel face, wherein each of the contactor posts is received in the mounting panel face and extends through the mounting panel face, and a first heat dissipation component mounted on the mounting panel face and thermally connected to each of the contactor posts. The thermal connection is via a thermally conductive and electrically insulative polymer insert, and each of the posts protrudes through the first heat dissipation component.Type: GrantFiled: September 25, 2012Date of Patent: October 6, 2015Assignee: Hamilton Sundstrand CorporationInventor: Debabrata Pal
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Publication number: 20140217837Abstract: A stator for an electric motor or generator comprising a circumferential support having a plurality of protrusions circumferentially distributed about the support; and a plurality of teeth arranged to receive coil windings, wherein each tooth includes a recess with interlocking means formed within the recess for engaging with a protrusion mounted on the circumferential support in a radial direction.Type: ApplicationFiled: February 3, 2011Publication date: August 7, 2014Applicant: PROTEAN ELECTRICInventor: Esad Jaganjac
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Patent number: 8766508Abstract: A rotor for a motor is provided including: a rotor core including at least one a first coupling portion on an outer circumference thereof, wherein the first coupling portion includes a first coupling groove or a first coupling projection; at least one division core spaced apart from the rotor core and including a second coupling portion on an outer circumference thereof, the second coupling portion including a second coupling groove or a second coupling projection; and a connecting pin including a third coupling portion and a fourth coupling portion, the third coupling portion to be coupled to the first coupling portion and the fourth coupling portion to be coupling to the second coupling portion.Type: GrantFiled: February 21, 2012Date of Patent: July 1, 2014Assignee: Samsung Electronics Co., Ltd.Inventor: Sung-Hyuk Park
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Patent number: 8736135Abstract: Teeth are arranged annularly around a rotation axis. The yoke has through holes. The through holes open in a radial direction around the rotation axis and in an axial direction along the rotation axis. The teeth are inserted through the through holes. A metal plate is arranged to face the yoke in the axial direction. A reinforcing plate is fixed to the teeth.Type: GrantFiled: February 24, 2010Date of Patent: May 27, 2014Assignee: Daikin Industries, Ltd.Inventors: Yoshinari Asano, Nobuyuki Kifuji, Tomonori Kikuno, Shin Nakamasu, Ryuuji Yasumoto
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Patent number: 8716913Abstract: In some embodiments, an electromagnetic machine includes a rotor element configured for movement relative to a stator. The rotor element includes a support member, a backing member, and a magnetic pole assembly. The support member includes a first coupling portion. The backing member is formed, at least in part, from a ferromagnetic material and the magnetic pole assembly is configured to be coupled to the backing member. The magnetic pole assembly and/or the backing member include a second coupling portion configured to removably couple the backing member and the magnetic pole assembly collectively to the first coupling portion of the support member.Type: GrantFiled: August 7, 2012Date of Patent: May 6, 2014Assignee: Boulder Wind Power, Inc.Inventors: Michael A. Kvam, Brian J. Sullivan, James David Duford, James D. Jore, Matthew B. Jore, David Samsel, James S. Smith
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Patent number: 8704420Abstract: Disclosed is a stator for an electric machine. The stator is provided with a stator core, and first and second series of coils each formed into a predetermined shape. Each of the coils in the first series is provided with a pair of first coil ends which respectively protrude from both end faces of the stator core. Each of the first coil ends is provided with a pair of bent portions which extend outward in the radial direction of the stator, and a bridge portion which connects the bent portions. Each second coil end is provided with a pair of upright portions and a bridge portion which connects the upright portions. The bridge portions of the coils in the first series are disposed outside the bridge portions of the coils in the second series in the radial direction of the stator. The bridge portion of each of the coils in the second series extends across the bent portions of two adjacent coils in the first series.Type: GrantFiled: March 30, 2010Date of Patent: April 22, 2014Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Hiroshi Kawano, Hirohito Hayashi, Satoru Baba
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Patent number: 8689427Abstract: A stator for an electric motor has a stator core, a winding and a housing enclosing the stator core and winding. The stator core has a yoke and a plurality of poles extending inwardly from the yoke. The winding formed by coils wound about the poles of the stator core. The housing grips the stator core and has at least one inwardly deformed portion that retains the stator core in the housing and prevents rotational movement of the stator core relative to the housing. A method of producing the stator is also disclosed.Type: GrantFiled: January 7, 2011Date of Patent: April 8, 2014Assignee: Johnson Electric S.A.Inventors: Yvan Bourqui, Miha Furlan, Michael Watzek, David Zimmermann
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Patent number: 8653714Abstract: A stator for an electric rotating machine includes a stator core that has an annular yoke portion, a plurality of tooth portions, a plurality of connecting portions and a plurality of slots. The tooth portions are separately formed from and assembled to the yoke portion. Each of the tooth portions extends radially inward from a radially inner periphery of the yoke portion. The tooth portions are arranged in the circumferential direction of the yoke portion at predetermined intervals. Each of the connecting portions circumferentially extends to connect a corresponding circumferentially-adjacent pair of the tooth portions. Each of the slots is formed between a circumferentially-adjacent pair of the tooth portions. Moreover, each of the slots is partitioned by a corresponding one of the connecting portions into a radially-outer section and a radially-inner section.Type: GrantFiled: July 1, 2011Date of Patent: February 18, 2014Assignee: Denso CorporationInventors: Makoto Taniguchi, Satoshi Ito
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Patent number: 8492951Abstract: A stator assembly includes a segmented stator having stator portions. Each stator portion includes a support structure and dovetails, each coupled to the support structure by adjustable elements. The stator portion also includes stator laminations, where each of the laminations has openings to engage with the dovetails. Connectors are provided to connect the stator portions of the segmented stator together.Type: GrantFiled: October 29, 2010Date of Patent: July 23, 2013Assignee: General Electric CompanyInventors: Robert Michael Zirin, Murtuza Lokhandwalla, Kiruba Sivasubramaniam Haran, Richard Nils Dawson, Mark John DeBlock
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Patent number: 8350441Abstract: A motor includes a shaft, a rotor, a stator, and a housing. The stator preferably includes a core including a plurality of teeth, a plurality of coils, and electrically insulating tubes. The core is defined by a combination of a plurality of unit cores each of which has a separate one of the teeth. The plurality of coils include two or more continuous coils defined by a single line of a conductor wire. Each of the electrically insulating tubes is arranged to cover at least a portion of the conductor wire which passes between the continuous coils.Type: GrantFiled: July 29, 2010Date of Patent: January 8, 2013Assignee: Nidec CorporationInventors: Keisuke Fukunaga, Motofumi Otsuji, Masato Aono
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Patent number: 8334632Abstract: A stator includes a stator-core having slots and teeth, and a back-yoke having convex and concave portions. The convex portions are partially inserted into the slots, and the concave portions receive the teeth. The teeth include tip portions whose circumferential widths become larger along a radial direction from the inside to the outside of the stator. The back-yoke includes convex portions whose circumferential widths become larger along the radial direction from the outside to the inside of the stator. The tip portions and the convex portions have substantially the same shape. The length of a joint portion between the tip portion and the convex portion, the circumferential width of the tooth corresponding to a tip surface of the convex portion, the width of a root portion of the tooth, and the circumferential width of the convex portion corresponding to a bottom face of the concave portion are substantially the same.Type: GrantFiled: November 1, 2010Date of Patent: December 18, 2012Assignee: Denso CorporationInventors: Keiji Kondou, Makoto Taniguchi, Takeo Maekawa, Akira Fukushima, Akito Akimoto, Shin Kusase, Yuya Mizuma
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Patent number: 8310126Abstract: A radial flux permanent magnet AC motor/generator employs a flat circular stator plate having a plurality of separately-formed electromagnets mounted in a ring pattern on a top surface thereof. A circular flux ring fabricated of powdered metal is mounted to the stator plate outside the ring of electromagnets. A plurality of permanent magnets are mounted in a ring pattern on the outer cylindrical surface of a steel rotor. The stator plate and rotor are axially and diametrically aligned such that the ring of permanent magnets rotates in close proximity to and inside the ring of electromagnets. The electromagnets utilize powder metal cores shaped to have rounded corners and flat sides that permit the use of heavier gauge windings and eliminate the air gaps that exist between the core and windings of prior art electromagnets.Type: GrantFiled: October 27, 2011Date of Patent: November 13, 2012Assignee: Motor Patent Licensors, LLCInventors: Thomas H. Hopkins, Nicholas R. Bries, Scott T. Graham, Howard F. Hendricks, Patrick J. Stoever
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Patent number: 8080916Abstract: A direct current motor with brushes in which an armature is provided with a rotating shaft that is supported by a yoke housing, an armature core that is fitted and fixed to a rotating shaft from the outer side, and a commutator that is provided on the rotating shaft adjacent to the armature core with nine segments arranged in the circumferential direction. The armature core has nine teeth that extend in the radial direction in a radial pattern and nine slots that are formed between the teeth and extend in the axial direction, the segments having the same polarity are connected with short-circuiting members, and a pair of brushes that make sliding contact with the segments is disposed so as to be mutually point symmetric centered on the rotating shaft. According to the preset invention, it is possible to effectively achieve flattening of the direct current motor.Type: GrantFiled: November 20, 2007Date of Patent: December 20, 2011Assignee: Mitsuba CorporationInventors: Naoki Shioda, Yoshichika Kawashima
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Patent number: 8076815Abstract: Electrical machines having pole teeth which can be equipped with a permanent magnet are intended to be capable of being assembled more easily. Provision is made for this purpose for two pole tooth halves (1,2) to be provided for each pole tooth, each of which two pole tooth halves has two opposing end sides. At least one end-side plate (3), which connects in each case one end side of the two pole tooth halves (1,2) to one another, is used for forming a pocket (5) between the two pole tooth halves (1,2), into which pocket a permanent magnet can be inserted. A space for the permanent magnet can therefore be kept free during assembly of the pole tooth or during winding thereof. Since the permanent magnet only needs to be inserted into the pocket (5) relatively late, the entire assembly process can be simplified.Type: GrantFiled: February 19, 2007Date of Patent: December 13, 2011Assignee: Siemens AktiengesellschaftInventors: Mark Freudenberg, Markus Jakobi, Josef Maidl, Michael Menhart
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Patent number: 8004142Abstract: A stator assembly is provided with detachable teeth that are made of magnetic powder material. The teeth are so configured and sized as to be interconnected to a core body of the stator with pre-formed coils that are positioned between adjacent teeth.Type: GrantFiled: February 10, 2009Date of Patent: August 23, 2011Assignee: TM4 Inc.Inventors: Stephane Poulin, Ruisheng Shi, Sebastien Bigras, Gabriel Rakotonirina, Steve Fleming, Martin Houle
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Publication number: 20110133479Abstract: An arrangement to set up and to ensure an air gap in an electrical machine, like a generator, is provided. The electrical machine includes a stator arrangement and a rotor arrangement. The rotor-arrangement rotates around a longitudinal axis. At least parts of the rotor arrangement interact with parts of the stator arrangement to generate electrical power. An air gap is defined by the distance between the parts of the rotor arrangement and the parts of the stator arrangement. The parts of the stator arrangement are opposite to the parts of the rotor arrangement along a certain length. The cross-section of the air gap changes along the certain length, so that the air gap is not uniform in view to the referred certain length.Type: ApplicationFiled: December 6, 2010Publication date: June 9, 2011Inventor: Henrik Stiesdal
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Patent number: 7906885Abstract: A brushless electric machine includes a rotor and a stator. Each of the twin poles of the stator electromagnetic members corresponds to one of the two magnetic poles of the rotor magnetic assembles. Two radial component air-gaps are arranged between the stator and the rotor to separate the stator and the rotor. Axial component air-gaps axially corresponding are arranged between the stator poles and the corresponding rotor poles to separate the stator poles and the rotor poles. The stator wheel-shaped ring is partly surrounded by the rotor wheel-shaped ring.Type: GrantFiled: June 28, 2006Date of Patent: March 15, 2011Assignees: Union Plastic (Hangzhou) Machinery Co., Ltd.Inventor: Weiting Lu
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Publication number: 20110037335Abstract: The present invention relates to an axial motor, and more specifically, to an axial motor which has a simple structure and is easily assembled by inserting and holding core teeth in core teeth insertion holes circularly arranged on a yoke. The axial motor according to the present invention includes: a stator having core teeth which are insulated by insulators, arranged in a ring-shaped pattern, and have a coil wound thereon; and a rotor having magnets which are arranged in a ring-shaped pattern to face the ends of the core teeth in an axial direction and are supported by the rotor axis at the center of the rotor to rotate relatively with respect to the stator.Type: ApplicationFiled: October 26, 2010Publication date: February 17, 2011Applicant: NEW MOTECH CO., LTD.Inventors: Jeong Cheol JANG, Ji Min LEE
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Patent number: 7884520Abstract: A brushless motor according to the present invention is provided with a tubular stator case, a stator core fitted into the stator case, and a rotor rotatably supported via a bearing inside the stator core. The stator core includes a tubular yoke portion and a plurality of split cores which are detachably mounted on the tubular yoke portion. A plurality of commutating-pole teeth which extend radially inward are integrally formed on an inner peripheral surface of the tubular yoke portion at regular intervals in the peripheral direction of the tubular yoke portion; and a root portion of each of the commutating-pole teeth has inclined shoulders which are gradually enlarged radially outward.Type: GrantFiled: November 4, 2008Date of Patent: February 8, 2011Assignees: Mitsuba Corporation, Honda Motor Co., Ltd.Inventors: Hisashi Ishida, Tohru Yumoto, Masaki Ishizeki, Susumu Miyazaki, Kazushi Hamaya
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Patent number: 7859162Abstract: Stable electrical connections between coils and a commutator are realized without causing slackening of the coils wound on individual magnetic teeth. An armature of a rotary motor includes an armature core structured splittably into magnetic tooth members which are individually wound by concentrated-winding type coils, and a commutator having the same number of segments as the number of the magnetic tooth members, the individual segments having connecting terminals, wherein an end portion of the coil concentratedly wound on one of the magnetic tooth members is connected generally in a straight line to the connecting terminal of the segment which is located at a position offset in a circumferential direction by a specific angle from the aforementioned one magnetic tooth member, and a conductor line connected to the connecting terminal of the segment is concentratedly wound on another magnetic tooth member adjacent to the aforementioned one magnetic tooth member.Type: GrantFiled: June 21, 2005Date of Patent: December 28, 2010Assignee: Mitsubishi Electric CorporationInventors: Kazuyuki Yamamoto, Koichi Tao, Yuki Fujioka
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Patent number: 7847443Abstract: The modular conical stator pole provides an improved conical stator assembly on electrical machines. The improved conical stator pole assembly comprises a plurality of stator poles, each pole comprising an assembly having a coil secured on a soft magnetic composites (SMC) stator pole tooth by inserting a winding support through the open core of the coil and attaching a back iron and a stator face to either end of the winding support. Each stator pole having a parallelogram shaped cross section for forming a conical shaped rotor space when the stator poles are assembled having the back irons bearing against each other to space the coils apart and form a conical shaped outside profile of the stator pole assembly. The conical stator having a small end and a big end. The tooth comprising a winding support integrally molded with either the back iron or the face.Type: GrantFiled: April 10, 2008Date of Patent: December 7, 2010Assignee: Burgess-Norton Mfg. Co., Inc.Inventor: David Farnia
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Publication number: 20100275660Abstract: Disclosed are a motor including a stator and a rotor separated from each other in an axial direction and a washing machine having the motor. Teeth made of a member formed separately from bobbins formed on the stator are installed on the bobbins. Therefore, the teeth are installed on the bobbins after a wire is wound on the bobbins.Type: ApplicationFiled: April 8, 2010Publication date: November 4, 2010Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Keun Young Yoon, Young Kwan Kim
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Patent number: 7821165Abstract: A motor includes: a rotor in which 10 poles are magnetized at regular intervals; a stator having 12 core pieces and facing the rotor, all core pieces having a concentrated winding wound in the same direction and being annularly arranged; and a wiring board for making 3-phase connection of the windings. A wire connection is made through the wiring board in such a manner that electric currents of adjacent same phase windings flow in opposite directions and of electric currents of adjacent different phase windings flow in same directions.Type: GrantFiled: July 11, 2006Date of Patent: October 26, 2010Assignee: Panasonic CorporationInventors: Mitsuru Yamane, Manabu Takeuchi
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Patent number: 7808149Abstract: A segmented electric generator/motor, such as for a wind powered generator, in which the rotor and/or stator is subdivided in the circumferential direction into segments disposed adjacent to one another. Additionally, the stator segments are accessible via and the rotor segments can be installed and removed in the axial direction in rotor segment mounts provided in the rotor ring. Each rotor segment preferably includes a base shaped to prevent radial and circumferential or tangential motion of the rotor segment while permitting axial motion in the rotor segment's respective mount. The rotor ring segment mounts are preferably sized to allow removal of stator segments through the openings.Type: GrantFiled: September 16, 2005Date of Patent: October 5, 2010Assignee: Wilic S.AR.L.Inventors: Otto Pabst, Michael Kleinlercher
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Patent number: 7786646Abstract: A magnetic force rotation device includes a rotor and a stator. The rotor is provided with a plurality of magnetic assemblies containing permanent magnet. The plurality of magnetic assemblies are arranged along the circumferential direction of the rotating shaft to form a wheel-shaped ring, and each magnetic assembly is provided with two magnetic poles. The stator is provided with a plurality of magnetically isolated electromagnets coaxially arranged. The electromagnets form a wheel-shaped ring around the rotating shaft, and each electromagnet is provided with paired poles. The wheel-shaped ring of the stator is at least party surrounded by the wheel-shaped ring of the rotor, so that each pole of the paired poles of the electromagnets of the stator corresponds to one magnetic pole of the two magnetic poles of the magnetic assemblies of the rotor respectively. Two axial component air gaps are provided between the rotor and the stator.Type: GrantFiled: April 1, 2007Date of Patent: August 31, 2010Assignees: Union Plastic (Hangzhou) Machinery Co., Ltd.Inventors: Weiting Lu, Hsiaoting Lu
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Patent number: 7755244Abstract: A stator of an electrical machine operable as a motor or a generator, applicable to a radial-axial type machine. The stator includes a plurality of stator segments disposed circumferentially about an axis. Each segment has a generally wedge shaped core and a winding wound around the core. The winding is bent to have portions that are disposed on multiple planes. The core includes an elongated wedge tip portions aligned parallel to the axis and an outer radial face opposite to the tip portion. The multiple planes include at least one plane substantially normal to the axis and at least one plane tangential to the radial face.Type: GrantFiled: May 11, 2007Date of Patent: July 13, 2010Assignee: UQM Technologies, Inc.Inventors: Josh Ley, Victor Chieduko, Jeff Frazzini, Kevin Lewis, Philip Caffery
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Publication number: 20100138127Abstract: An electric motor includes one or more separate coil sets arranged to produce a magnetic field of the motor. The electric motor also includes a plurality of control devices coupled to respective sub-sets of coils for current control. A similar arrangement is proposed for a generator. A coil mounting system for an electric motor or generator includes one or more coil teeth for windably receiving a coil for the motor and a back portion for attachably receiving a plurality of the coil teeth. A traction control system and method for a vehicle having a plurality of wheels independently powered by a respective motor. A suspension control system and method for a vehicle having a plurality of wheels, each wheel being mounted on a suspension arm of the vehicle and being independently powered by a respective motor.Type: ApplicationFiled: July 13, 2007Publication date: June 3, 2010Applicant: QED GROUP LIMITEDInventor: Martin Boughtwood
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Patent number: 7728482Abstract: The invention relates to a brushless DC machine comprising a rotor and a stator that supports a winding assembly. The stator encompasses a toothed rim with tooth tips that extend radially outward as well as a return ring. The toothed rim and the return ring are embodied so as to engage into each other in a radial direction. The invention further relates to a return ring packet, a toothed rim packet, a top piece, and a method for producing a brushless DC machine.Type: GrantFiled: January 23, 2006Date of Patent: June 1, 2010Assignee: Robert Bosch GmbHInventor: Hartmut Seiler
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Patent number: 7723891Abstract: A motor including a mounting shaft having a hollow channel and a bearing attached to each end, a cylindrical hub having a hollow core for the mounting shaft, and plural rows of plural Molded Magnetic Flux Channels with a hollow core and a channel forming a U-shaped recess and mounted the surface of the hub, each row corresponding to a motor phase. Each magnetic flux channel forms two pole pieces divided by the channel. The motor also includes plural phase windings, one passing through each row of plural Molded Magnetic Flux Channels, a rotating drum having plural rows of permanent magnets on an inner surface, each row pair corresponding to and aligned with one of the plural rows of Molded Magnetic Flux Channels. The rotating drum connected with the bearing, and drive electronics for driving the plural phase windings, wherein the plural Molded Magnetic Flux Channels increases torque and motor efficiency.Type: GrantFiled: February 16, 2009Date of Patent: May 25, 2010Inventor: Norman Rittenhouse
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Patent number: 7723892Abstract: A synchronous motor includes multiple coil segments, each of which has an iron core in the form of a core stack that is wound with a coil. The coil segments are characterized in that the coils press fastening elements having at least two legs against two opposite surfaces of the substantially right parallelepiped iron core. In each case, at least one leg of the fastening element abutting against the iron core is pressed against the iron core, and at least one free leg of the fastening element projects away from the iron core. The free legs are fastened to connecting elements that connect multiple coil segments to one another.Type: GrantFiled: July 11, 2008Date of Patent: May 25, 2010Assignee: Etel S.A.Inventors: Vincent Cardon, Jean-Pierre Morel
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Patent number: 7701107Abstract: Included are a rotor, and a stator having a yoke section and a teeth section including multiple teeth. The teeth section and the yoke section are made of mutually independent configuration members, and connected to each other. At least one of the teeth section and the yoke section is formed by connecting each neighboring two of its multiple segments arranged one after another in a direction in which the rotor rotates. At least some neighboring teeth out of the multiple teeth are unified.Type: GrantFiled: September 4, 2007Date of Patent: April 20, 2010Assignee: Sanyo Electric Co., Ltd.Inventors: Hiroaki Sagara, Yukifumi Yamaguchi, Takashi Uchino, Kazuhiro Tomoshige, Keiji Kishimoto, Tetsuji Ueta, Kenji Taguchi
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Patent number: 7646130Abstract: A stator assembly is provided for an electric motor having a longitudinal axis. The stator assembly includes at least one stator segment having a first end member having a stator tooth and at least one of a stator shoe and a back iron. A second end member is positioned with respect to the first end member and has a stator tooth and at least one of a stator shoe and a back iron. A winding generally circumscribes the stator tooth of the first end member and the stator tooth of the second end member. The first and second end members have a parting line generally perpendicular to the longitudinal axis of the motor. A motor incorporating the stator assembly of the present invention is disclosed. Additionally, a method of forming the stator assembly of the present invention is described.Type: GrantFiled: April 26, 2006Date of Patent: January 12, 2010Assignee: GM Global Technology Operations, Inc.Inventors: Alan G. Holmes, Richard A. Ordo, Ahmed M. El-Antably
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Publication number: 20090236919Abstract: A stator assembly is provided with detachable teeth that are made of magnetic powder material. The teeth are so configured and sized as to be interconnected to a core body of the stator with pre-formed coils that are positioned between adjacent teeth.Type: ApplicationFiled: February 10, 2009Publication date: September 24, 2009Inventors: Stephane POULIN, Ruisheng SHI, Sebastien BIGRAS, Gabriel RAKOTONIRINA, Steve FLEMING, Martin HOULE