Interfitting Or Claw Tooth Rotors Patents (Class 310/263)
  • Publication number: 20100072852
    Abstract: Each of first and second pole cores has a boss portion, six core flange portions; and six claw-shaped magnetic pole portions, the first and second pole cores being disposed such that the claw-shaped magnetic pole portions face each other so as to intermesh and leading end surfaces of the boss portions are abutted with each other. The boss portions include coil mount portions in which cross-sectional shapes that are perpendicular to the central axis are hexagons; and abutted portions that have circular cross sections and that are disposed so as to protrude from leading ends of the coil mount portions. Radially-inner surfaces of the claw-shaped magnetic pole portions face side surfaces of the coil mount portions and are parallel to the side surfaces of the coil mount portions at the cross sections that are perpendicular to the central axis.
    Type: Application
    Filed: December 1, 2009
    Publication date: March 25, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Shinji NISHIMURA
  • Publication number: 20100066194
    Abstract: An electric machine, in particular an electrically excited claw pole generator for a motor vehicle, is provided, having a stator winding, the phase terminals of which may be connected in the manner of a pentagram to a rectifier system. The stator winding has a five-phase design, phase terminals situated in adjacent slots being interconnected at least once. All of the phase terminals may be interconnected are situated in adjacent slots.
    Type: Application
    Filed: October 10, 2007
    Publication date: March 18, 2010
    Applicant: Robert Bosch GmbH
    Inventors: Gert Wolf, Norbert Pfitzke
  • Patent number: 7679259
    Abstract: A claw-pole rotor for an electrical machine, in particular a rotary current generator, having two pole wheels (26, 27), which each carry claw poles (28 and 29, respectively), which each originate in a plate region (50) and have a pole root (53), and on a circumference of the claw-pole rotor (20), claw poles (28, 29) of the pole wheels (26, 27) are located in alternation, and located between the claw poles or interstices (90), and a claw pole (28, 29) has a radially outward-oriented cylindrical-jacketlike surface (43), by which a pivot axis (65) is defined, and a chamfer (68) extends on the one hand in a circumferential direction and on the other in an edge direction of a claw pole (28 and 29, respectively), wherein the chamfer (68) has a center portion m in the edge direction that intersects a transition plane (59) which demarcates the pole root (53) and the freely projecting part of the claw pole (28 and 29, respectively), and the center portion m amounts to 8/10 of the length, oriented in the edge direction
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: March 16, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Hans-Joachim Lutz, Reinhard Meyer, Guenter Rademacher
  • Patent number: 7671508
    Abstract: According to the present invention, an alternator includes a rotor, a stator, and at least one cooling fan. The rotor includes a rotary shaft, a field core, and a field coil. The field coil has first and second ends that are opposite to each other in an axial direction of the rotary shaft. The stator includes an armature core and an armature coil. The armature core has first and second ends that are opposite to each other in the axial direction. The first end of the armature core is closer to the first end than the second end of the field coil. An axial distance between the first and second ends of the field coil is less than that between the first and second ends of the armature core. The first end of the field coil protrudes outward from the first end of the armature core in the axial direction.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: March 2, 2010
    Assignee: Denso Corporation
    Inventors: Kazushige Okumoto, Shin Kusase
  • Publication number: 20100026131
    Abstract: It is designed for accumulator batteries charging and for electrical energy generating with rectified voltage for movable and unmovable vehicles and/or objects. It possesses two identical mirror-image disposed rotor 2 and 2a and excitation 3 and 3a sets and common stator 4 with three-phase stator winding 11 realized in two groups windings, dephasing on 60/q electrical degrees. Each winding 11 is switched on with own terminals and diodes to rectified block 26, build of group isolated 30 and group connected with chassis ground 31 diodes upset in two metal, ribbed, concentric situated inner 32 and outside 33 radiators pressed with their plane surfaces to rear end bell 7 of housing 5. Inner radiator 33 has ventilation holes 35. Advantage of alternator is increased output current at reduced input power and constant alternator volume and speed of rotation as well as increased applied time of alternator and its bearings.
    Type: Application
    Filed: June 6, 2007
    Publication date: February 4, 2010
    Inventor: Encho Nikolov Popov
  • Patent number: 7656069
    Abstract: First and second magnet holding apertures are disposed through first and second permanent magnet holding seats that are disposed so as to protrude from first and second yoke portions so as to have aperture centers that are oriented in an axial direction. Cylindrical resin first and second magnet loading portions are disposed so as to project integrally on first and second fans such that central axes thereof are oriented in the axial direction, and first and second permanent magnets are insert-molded into the first and second magnet loading portions. The first and second fans are fixed to first and second pole cores by fitting the first and second magnet loading portions together with the first and second magnet holding apertures.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: February 2, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kanji Shinkawa, Masaya Inoue, Hiroyuki Akita, Norihiro Murata, Toshiyuki Yoshizawa, Shinji Nishimura
  • Patent number: 7656068
    Abstract: Each of first and second pole cores has a boss portion, six core flange portions; and six claw-shaped magnetic pole portions, the first and second pole cores being disposed such that the claw-shaped magnetic pole portions face each other so as to intermesh and leading end surfaces of the boss portions are abutted with each other. The boss portions include coil mount portions in which cross-sectional shapes that are perpendicular to the central axis are hexagons; and abutted portions that have circular cross sections and that are disposed so as to protrude from leading ends of the coil mount portions. Radially-inner surfaces of the claw-shaped magnetic pole portions face side surfaces of the coil mount portions and are parallel to the side surfaces of the coil mount portions at the cross sections that are perpendicular to the central axis.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: February 2, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventor: Shinji Nishimura
  • Publication number: 20100013351
    Abstract: The claw-pole-rotor shaft has a front end with a radially larger-sized section, two knurled regions known as crimping regions, intended to be assembled with the claw-pole rotor by local deformation of the material of the claw-pole rotor, and a centring region for centring the claw-pole rotor, the crimping regions being positioned on each side of the centring region while the centring region projects radially with respect to the crimping regions of the shaft, these themselves projecting radially with respect to the section of larger radial size at the front end of the shaft. The claw-pole rotor is characterized in that it is equipped with such a shaft while the rotary electrical machine is characterized in that it is equipped with such a rotor.
    Type: Application
    Filed: September 13, 2007
    Publication date: January 21, 2010
    Inventors: Oliver Gas, Alexandre Pfleger
  • Patent number: 7642691
    Abstract: Resin pooling grooves are disposed so as to extend over entire regions in a thickness direction of a first magnet holder on two sides of a bottom surface in a width direction of a first receiving groove, and resin pooling grooves are also disposed so as to extend over entire regions in the thickness direction of the first magnet holder on two side surfaces of the first receiving groove near the bottom surface. A first resin injection aperture is disposed through the first magnet holder so as to communicate with the resin pooling grooves over an entire region in the thickness direction. A first permanent magnet is held by the first magnet holder by fitting the first permanent magnet into the first receiving groove together with a first magnet cover, and injecting a resin material into the resin pooling grooves through the first resin injection aperture and hardening it.
    Type: Grant
    Filed: December 31, 2008
    Date of Patent: January 5, 2010
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masao Morita, Ryuichi Shimomura, Hiroyuki Akita
  • Patent number: 7642690
    Abstract: According to the invention, a tandem alternator includes a rotary shaft, a first and a second power generation unit that are arranged in tandem in the axial direction of the rotary shaft, a housing, a slip ring-brush mechanism provided around a rear end portion of the rotary shaft, and a first and a second rectifier that are respectively fixed to a front and a rear end face of the housing, and a controller. The controller is electrically connected between the first rectifier and the slip ring-brush mechanism to control, at least, supply of the first field current to the first field winding. The controller is configured to form a freewheeling circuit when the first field current is interrupted. The controller is fixed to the rear end face of the housing to minimize the distance from the controller to the slip ring-brush mechanism, thereby minimizing resistance loss of the freewheeling circuit.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: January 5, 2010
    Assignee: Denso Corporation
    Inventors: Takeo Maekawa, Shin Kusase, Akiya Shichijoh
  • Publication number: 20090322176
    Abstract: A rotor of a synchronous motor includes a rotating shaft, a plurality of segments, a plurality of permanent magnets, and a field coil. The segments are located radially outward of the rotating shaft and arranged in the circumferential direction of the rotating shaft at a predetermined pitch with spaces formed therebetween. Each of the segments has a recess making up a magnetic reluctance portion and an opposite pair of ends making up salient-pole portions. Each of the permanent magnets is disposed in one the spaces between the segments with a predetermined orientation of its N and S poles. The field coil is wound around the segments to extend in the circumferential direction of the rotating shaft through the recesses of the segments. The field coil creates, when energized with DC current, magnetic flux which magnetizes the pair of ends of each of the segments in opposite directions.
    Type: Application
    Filed: June 29, 2009
    Publication date: December 31, 2009
    Applicant: DENSO CORPORATION
    Inventors: Shin Kusase, Keiji Kondou, Takeo Maekawa
  • Patent number: 7619338
    Abstract: A brushless AC generator is mounted on a vehicle such as a truck, a farming vehicle or a construction vehicle. The generator is composed of a housing, stator fixedly contained in the housing, a rotor, for supplying a magnetic field to the stator, rotatably supported in the stator, and other associated components including a voltage regulator and a rectifier. The housing is composed of a front housing and a rear housing. An outside fan is connected to a rotor shaft and disposed at a front side. Cooling air is introduced into the generator by the outside fan through windows formed in the rear housing. A fringe surface of the window facing a shoulder portion of the rotor is sloped, so that the cooling air is smoothly introduced along the sloped surface thereby to improve cooling efficiency.
    Type: Grant
    Filed: February 19, 2008
    Date of Patent: November 17, 2009
    Assignee: Denso Corporation
    Inventor: Hiroshi Hamada
  • Patent number: 7608973
    Abstract: A resin bobbin is mounted to a pole core by fitting a body portion thereof over first and second boss portions. A rotor coil is configured by winding a conducting wire onto the bobbin, and an output wire of the conducting wire that is led out from the wound portion is wound doubly onto an output wire securing portion of the bobbin. An edge portion of a radially-outermost surface of the output wire securing portion near the body portion is placed in contact with an inner circumferential wall surface of a first claw-shaped magnetic pole portion.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: October 27, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Naohide Maeda, Masahiko Fujita
  • Patent number: 7605518
    Abstract: An on-vehicle rotary electric machine, such as AC generator, is provided. The machine comprises a rotary shaft, a pole core, plural magnetic poles, plural permanent magnets, and plural holding members. The magnetic poles are located at intervals in a circumferential direction and passing magnetic flux between two mutually-adjacent of the magnetic poles. Each permanent magnet intervenes between the two magnetic poles and is magnetized to reduce leakage of the magnetic flux to be passed. Each holding member holds each permanent magnet between the two magnetic poles. Each holding member is secured on the two magnetic poles and has a first plate portion enclosing a radially outer surface of each permanent magnet and two second plate portions enclosing side surfaces of each permanent magnet. The two second plate portions are rigidly coupled to the first plate portion and are lower in rigidity than the first plate portion.
    Type: Grant
    Filed: October 3, 2005
    Date of Patent: October 20, 2009
    Assignee: Denso Corporation
    Inventor: Shigenobu Nakamura
  • Patent number: 7605519
    Abstract: A magnet seat is disposed on a second yoke portion and projects into respective spaces between circumferentially-adjacent pairs of second claw-shaped magnetic pole portions, and permanent magnets are disposed only near the second yoke portion so as to be held by the magnet seat so as to face an inner circumferential surface near a tip end of each of a plurality of first claw-shaped magnetic pole portions. Each of the permanent magnets is magnetically oriented in a reverse direction to an orientation of a magnetic field that a field coil produces.
    Type: Grant
    Filed: August 11, 2008
    Date of Patent: October 20, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masao Morita, Masaya Inoue, Kanji Shinkawa, Toshiyuki Yoshizawa, Moriyuki Hazeyama, Shinji Nishimura
  • Patent number: 7605511
    Abstract: In a vehicular alternator having a permanent magnet protection mechanism, each magnet holder of a non-magnetic characteristic if a rectangle prism shape accommodates each permanent magnet disposed between adjacent claw poles. The magnet holders are connected in a ring shape along a circumferential direction of the alternator by using each connecting plate part which extends from each magnet holder in approximate circumferential direction toward an inner side of and at a front tip part of each claw pole. The connecting plate parts and the magnet holders are made from a non-magnetic plate by cutting and bending. Making the surfaces and the connecting plate part of each magnet holder from the non-magnetic plate by cutting and bending provides a high accuracy magnet position in the alternator with low manufacturing cost.
    Type: Grant
    Filed: August 6, 2007
    Date of Patent: October 20, 2009
    Assignee: Denso Corporation
    Inventors: Shinya Oowatari, Yoshiki Tan, Shinichi Matsubara, Masatoshi Koumura
  • Patent number: 7602095
    Abstract: According to the invention, a tandem alternator includes a rotary shaft, a first and a second field arranged in tandem on the rotary shaft, and a first and a second armature arranged in tandem in the axial direction of the rotary shaft. The first armature is provided on an outer periphery of the first field to constitute a first power generation unit. The second armature is provided on an outer periphery of the second field to constitute a second power generation unit. The first and second fields are arranged to abut each other in the axial direction of the rotary shaft, so as to minimize the axial length of the alternator. The first and second fields are configured to respectively create a first and a second magnetomotive force whose directions are opposite to each other, so as to minimize magnetic leakage between the first and second power generation units.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: October 13, 2009
    Assignee: Denso Corporation
    Inventors: Shin Kusase, Takeo Maekawa, Akiya Shichijoh
  • Patent number: 7592735
    Abstract: A Lundell type rotor of an alternator has a pole core disposed on an outer side of a field coil in a radial direction of the rotor, and a non-magnetic claw pole joint ring. The pole core has claw poles disposed along a circumferential direction of the rotor at predetermined intervals. Each claw pole extends along an axial direction of the rotor and is magnetized in response to an electric current supplied to the field coil. The joint ring is formed by spirally bending a long band bar in a coil shape and has turn portions disposed along the axial direction. Each turn portion of the joint ring has no seams and is attached to inner side surfaces of the claw poles in the radial direction.
    Type: Grant
    Filed: July 9, 2007
    Date of Patent: September 22, 2009
    Assignee: Denso Corporation
    Inventor: Hiroshi Hamada
  • Patent number: 7589449
    Abstract: The electric rotating machine includes a rotor and an armature. The rotor consists of a cylindrical part having a field winding and a claw-pole shaped magnetic pole part. A magnetic short-circuit mechanism is disposed between the magnetic pole parts adjacent each other in circumferential direction of a rotor core so as to cause a magnetic plate of a material of high magnetic permeability to move toward radial direction of the rotor core, thereby short-circuiting between N-pole and S-pole of a permanent magnet due to centrifugal force acting in accordance with rotation of the rotor.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: September 15, 2009
    Assignee: Mitsubishi Denki Kabushiki Kasiha
    Inventor: Yutaka Kitamura
  • Publication number: 20090218907
    Abstract: The Lundell motor apparatus includes a controller for controlling a field current passed to a field coil of a Lundell-type rotor of a motor and an armature current passed to a stator coil of the motor in order to generate a required torque. When the field current is If, the armature current is Ia, a d-axis inductance is Ld, a q-axis inductance is Lq, a q-axis current as a q-axis component of the armature current is Iq, a d-axis current as a d-axis component of the armature current is Id, a field torque is Tf, a field flux is ?f, a reluctance torque is Tr, and a combined torque of the field torque and the reluctance torque is ?T, the controller passes the d-axis current Id to the stator coil within a phase angle range in which the combined torque ?T become larger than the field torque Tf in order to generate the reluctance torque Tr which is equal to (Ld?Lq)Id·Iq in addition to the field torque Tf.
    Type: Application
    Filed: February 10, 2009
    Publication date: September 3, 2009
    Applicant: DENSO CORPORATION
    Inventor: Shin Kusase
  • Patent number: 7583005
    Abstract: The apparatus disclosed herein relates to a pole piece for an electric machine comprising, a pole piece with a finger support structure, a plurality of fingers having an axial component of extension relative to the finger support structure, a coil contact surface and at least one of a protrusion or a depression having an axial component of extension relative to the coil contact surface. Further disclosed is a method that relates to assembling a coil to pole pieces comprising, axially compressing a coil between coil contact surfaces of a pair of opposing pole pieces and deforming the coil axially and without radial deformation with at least one of protrusions and depressions in the coil contact surfaces of the pole pieces thereby rotationally fixing the coil to the pole pieces.
    Type: Grant
    Filed: May 19, 2006
    Date of Patent: September 1, 2009
    Assignee: Remy International, Inc.
    Inventor: Michael T. York
  • Publication number: 20090206696
    Abstract: Various devices for generating electrical or mechanical output, comprising a coil, a rotor assembly rotatable about an axis, the rotor comprising alternating magnet portion and flux conducting portions, each of the magnet portions having a first end with a first polarity and a second end with the opposite polarity and oriented along the periphery such that the first end of each magnet portion points toward the first end of the previous magnet portion and the second end of each magnet portion points toward the second end of the next magnet portion, a stator assembly having first and second sets of stator flux conductor extensions, each of the stator flux conductor extensions having a stator surface facing the rotor, wherein rotating the rotor assembly about the axis alternates the rotor assembly between a first and a second position, causing magnetic flux to flow. The stator and the rotor may be reversed in operation.
    Type: Application
    Filed: May 9, 2008
    Publication date: August 20, 2009
    Inventor: David Gregory Calley
  • Publication number: 20090200886
    Abstract: Resin pooling grooves are disposed so as to extend over entire regions in a thickness direction of a first magnet holder on two sides of a bottom surface in a width direction of a first receiving groove, and resin pooling grooves are also disposed so as to extend over entire regions in the thickness direction of the first magnet holder on two side surfaces of the first receiving groove near the bottom surface. A first resin injection aperture is disposed through the first magnet holder so as to communicate with the resin pooling grooves over an entire region in the thickness direction. A first permanent magnet is held by the first magnet holder by fitting the first permanent magnet into the first receiving groove together with a first magnet cover, and injecting a resin material into the resin pooling grooves through the first resin injection aperture and hardening it.
    Type: Application
    Filed: December 31, 2008
    Publication date: August 13, 2009
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Masao Morita, Ryuichi Shimomura, Hiroyuki Akita
  • Patent number: 7573175
    Abstract: In a tandem AC generator for a vehicle having dual armature core-Lundel type field core pairs placed in series, an intermediate ring as a cylindrical spacer is placed between the dual armature cores. One armature core, the intermediate ring, and the other armature core are pressed and tightly fastened to each other in the direction of a rotary shaft by front and rear housings by a through bolt. A circumference wall part of the front housing accommodates one armature core and the intermediate ring completely and further accommodates a part of an outer circumference surface of the other armature core. This simple construction of the tandem AC generator provides improved and superior vibration proof.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: August 11, 2009
    Assignee: Denso Corporation
    Inventors: Kazushige Okumoto, Shin Kusase
  • Patent number: 7569968
    Abstract: A rotor for a vehicular electric rotary machine, a vehicular electric rotary machine using such a rotor, a method of manufacturing a rotor of a vehicular electric rotary machine and a method of manufacturing a vehicular electric rotary machine are disclosed. The rotor includes front and rear pole cores having disc portions, radially extending from boss portions supported with a rotary shaft and carrying thereon a field coil, which have claw-shaped poles which are circumferentially spaced from each other at equidistant intervals. The claw-shaped poles have flange portions circumferentially facing with each other for retaining permanent magnets and magnet holding members in circumferentially and equidistantly spaced positions. Each disc portion has a pair of stepped portions formed to be contiguous with the flange portions to restrict axial end faces of the permanent magnet and the magnet holding member in circumferential, radial and axial directions.
    Type: Grant
    Filed: May 1, 2007
    Date of Patent: August 4, 2009
    Assignee: Denso Corporation
    Inventor: Shigenobu Nakamura
  • Patent number: 7564156
    Abstract: The vehicle-use tandem electric rotating machine includes a first stator-rotor pair, a second stator-rotor pair, and a controller individually controlling a first field current flowing into a first field coil of the first stator-rotor pair and a second field current flowing into a second field coil of the second stator-rotor pair. The first stator-rotor pair is configured to generate electric power to be supplied to essential electric loads, and the second stator-rotor pair is configured to generate electric power to be supplied to non-essential electric loads. The controller is configured to restrict the second field current from flowing into the second field coil when rotational speed of a vehicle engine driving the tandem electric rotating machine is lower than a predetermined threshold speed set above an idle speed of the vehicle engine.
    Type: Grant
    Filed: July 17, 2006
    Date of Patent: July 21, 2009
    Assignee: Denso Corporation
    Inventors: Kazushige Okumoto, Shin Kusase
  • Patent number: 7560851
    Abstract: A dynamoelectric machine includes: a permanent magnet holding portion that is disposed integrally so as to project from the yoke portion on a portion of the pair of yoke portions that faces an inner circumferential surface near a tip end of the plurality of claw-shaped magnetic pole portions; an arc-shaped magnet holding aperture that has a C-shaped cross section that is formed in each of the permanent magnet holding portions so as to have an aperture center that is oriented axially, in which at least one axial end is open, and that opens radially outward; a magnet holding member that is made of a nonmagnetic material that is fitted into and held by the magnet holding aperture; and a permanent magnet that is held by the magnet holding member so as to face the inner circumferential surface near the tip end of the claw-shaped magnetic pole portions, that is prepared into a prismatic body that has a quadrilateral cross section perpendicular to an axial direction, and that is magnetically oriented in a reverse di
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: July 14, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaya Inoue, Kanji Shinkawa, Shinji Nishimura, Hiroyuki Akita, Toshiyuki Yoshizawa, Moriyuki Hazeyama, Norihiro Murata, Masao Morita
  • Publication number: 20090160288
    Abstract: A device for generating electrical or mechanical output, comprising a rotor coil, a rotor assembly with an axis, and having rotator extensions, a stator coil, and a stator assembly, the stator assembly having two sets of stator flux conductor extensions, the rotator end of the stator flux conductor extension having a stator conductor surface and the interior ends of the first set of stator flux conductor extensions abutting the interior ends of the second stator flux conductor extensions at an abutting junction, wherein rotating the rotor assembly about the axis alternates the rotor assembly between a first and second position in which each of the rotor extension surfaces alternately face the stator conductor surfaces of the first and second set of stator flux conductor extensions. The first and second positions of the rotor assembly lead to the conduction of magnetic flux in the device in opposite paths in the stator assembly generating an output in an output coil.
    Type: Application
    Filed: May 9, 2008
    Publication date: June 25, 2009
    Inventor: David Gregory Calley
  • Publication number: 20090152979
    Abstract: An automotive alternator is disclosed which includes an annular core disposed to surround the radially outer peripheries of all magnetic pole claws of magnetic pole cores. The annular core has, on an outer surface thereof, a plurality of protrusions, a plurality of recesses, and a plurality of slopes. Each of the protrusions is so provided as to be coincident with a corresponding one of the magnetic pole claws of the magnetic pole cores in the circumferential direction of a rotary shaft. Each of the recesses is alternately formed with the protrusions so as to be coincident with a corresponding one of air gaps formed between the magnetic pole claws of the magnetic pole cores in the circumferential direction. Each of the slopes is inclined to the radial direction of the rotary shaft and connects a circumferentially adjacent pair of one of the protrusions and one of the recesses.
    Type: Application
    Filed: December 10, 2008
    Publication date: June 18, 2009
    Applicant: DENSO CORPORATION
    Inventor: Nobuo Isogai
  • Patent number: 7545074
    Abstract: According to the invention, there is provided a rotor for a rotating electrical machine which includes a rotary shaft, a pair of first and second pole cores fixed on the rotary shaft, a plurality of permanent magnets, and a magnet holder holding the permanent magnets. The magnet holder is made of a non-magnetic metal and has a plurality of holding portions and a plurality of connecting portions. Each of the holding portions is interposed between circumferentially adjacent two of claws of the first and second pole cores, so as to hold a corresponding one of the permanent magnets between the adjacent two claws. Each of the connecting portions circumferentially extends, through the radially inner side of a distal end portion of one of the claws of the first and second pole cores, to connect end portions of adjacent two of the holding portions which circumferentially bracket the distal end portion.
    Type: Grant
    Filed: May 10, 2007
    Date of Patent: June 9, 2009
    Assignee: Denso Corporation
    Inventors: Takeo Maekawa, Shin Kusase
  • Publication number: 20090121575
    Abstract: The invention relates to a generator, especially for motor vehicles, which comprises a generator stator (36) having winding slots and subcoils (10 21) lying in said winding slots (35). The subcoils (10 21) are connected to each other via a bridge circuit (3) in order to produce a DC voltage from a multiphase AC voltage produced by a rotary field. The generator is configured as a multiphase generator (30), preferably a three-phase or six-phase generator (30). The aim of the invention is to reduce magnetic nose and torque ripple merely by modifying the subcoil wiring. For this purpose, the subcoils (10 21) are connected to an angular ring and the bridge circuit (3) connected to the ring has a lower phase number than corners of the angular ring circuit (1).
    Type: Application
    Filed: January 2, 2007
    Publication date: May 14, 2009
    Inventor: Gert Wolf
  • Patent number: 7525233
    Abstract: A vehicle alternator has a rotor having plural claw poles and a stator placed at the outer circumference of the surface of the rotor. Plural grooves are formed in a specified rear area on a surface of each claw pole faced to the stator. The specified rear area is an approximate rear half area on the surface of the claw pole along a rotating direction of the rotor. The grooves are formed in parallel to each other. Each groove has one or a combination of a U-letter shaped groove having a circulation-arc shaped bottom, a rectangle shaped groove having a rectangle shaped bottom, and the like. The configuration of each claw pole ensures the reduction of generating an eddy current on the surface of each claw pole and thereby prevents a reduction of output power of the vehicle alternator.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: April 28, 2009
    Assignee: Denso Corporation
    Inventors: Motoki Itoh, Yusuke Kawano
  • Publication number: 20090102314
    Abstract: A rotating electrical machine includes: a stator that includes two stator stages each constituted with a plurality of claw poles extending toward opposite sides along an axial direction at alternate positions and a ring-shaped core back that forms a magnetic path between the claw poles, the two stator stages being stacked over along the axial direction; a stator winding formed by winding a coil in a ring shape and disposed in a space enclosed by the claw poles and the core back at each of the stator stages; and a rotor rotatably disposed at a position facing the claw poles of the stator, and: stator windings corresponding to a plurality of phases are disposed together at least at one of the two stator stages.
    Type: Application
    Filed: August 22, 2008
    Publication date: April 23, 2009
    Applicant: Hitachi, Ltd.
    Inventors: Kenji Miyata, Yoshihisa Ishikawa, Motoya Ito, Yuji Enomoto, Takayuki Koyama
  • Patent number: 7520148
    Abstract: In one aspect, a drum type washing machine includes, among other things, a tub supporter of metal between a wall of a tub and a stator, where the stator includes an annular helical type core having multiple layers formed by winding a steel plate having Ts and a base portion in a helix starting from a bottom layer to a top layer, an insulator insert molded with the helical type core to cover an outside surface of the helical type core for electrical insulation of the helical type core, and three fastening portions formed, as a unit with the insulator projected from an inside circumferential surface of the helical type core toward a center of the stator, for fastening the stator to the tub supporter, wherein the fastening portion has a fastening hole at a center for fastening the stator to the wall of the tub with screws.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: April 21, 2009
    Assignee: LG Electronics Inc.
    Inventor: Soung Bong Choi
  • Patent number: 7514837
    Abstract: A brushless alternator includes: a rotor mounted on a shaft; a ring-shaped yoke which is opposed to the rotor via a very narrow radial clearance; a stepped portion provided on a side surface of an inner circumference of an axial end section of the yoke; a plate fixed to the stepped portion and having a cylindrical portion made of a magnetic material; a bobbin provided so as to surround a radially outer side of the cylindrical portion of the plate for the purpose of winding a field coil therearound; and a stator provided with a clearance retained on an outer side of the rotor, wherein a radial thickness of a part of the cylindrical portion which is fixed to the stepped portion provided on the inner circumferential surface of the yoke is set larger than 1 mm and not larger than 2 mm.
    Type: Grant
    Filed: January 27, 2006
    Date of Patent: April 7, 2009
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Motokazu Kuroda, Kyoko Higashino
  • Publication number: 20090079294
    Abstract: A vehicle A.C. generator has a rotor. The rotor has a pair of pole cores and magnet holders. Each pole core has a plurality of claw-like magnet poles. Each magnet holder contains a permanent magnet and placed between the adjacent claw-like magnet poles in order to prevent leakage flux. The rotor has a pair of supporting members in order to stop each magnet holder shifting in the direction of a rotary shaft of the rotor. Each supporting member has projecting parts which correspond to the magnet holders. The supporting members are fixed to one end surface of the pole cores, respectively. Each projecting part fixes the position of the corresponding permanent magnet in the rotor.
    Type: Application
    Filed: September 8, 2008
    Publication date: March 26, 2009
    Applicant: DENSO CORPORATION
    Inventors: Shinya Oowatari, Yoshinori Hayashi
  • Publication number: 20090026856
    Abstract: A brushless AC generator is mounted on a vehicle such as a truck, a farming vehicle or a construction vehicle. The generator is composed of a housing, stator fixedly contained in the housing, a rotor, for supplying a magnetic field to the stator, rotatably supported in the stator, and other associated components including a voltage regulator and a rectifier. The housing is composed of a front housing and a rear housing. An outside fan is connected to a rotor shaft and disposed at a front side. Cooling air is introduced into the generator by the outside fan through windows formed in the rear housing. A fringe surface of the window facing a shoulder portion of the rotor is sloped, so that the cooling air is smoothly introduced along the sloped surface thereby to improve cooling efficiency.
    Type: Application
    Filed: February 19, 2008
    Publication date: January 29, 2009
    Applicant: DENSO CORPORATION
    Inventor: Hiroshi Hamada
  • Publication number: 20090009025
    Abstract: An alternating-current dynamoelectric machine according to the present invention includes: a stator including: a stator core in which slots that extend in an axial direction are formed on an inner side; and a stator winding that is mounted to the stator core by winding conducting wires into the slots; and a rotatable rotor including: a field winding that is disposed inside the stator; a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover the field winding and that alternately intermesh with each other; and first and second permanent magnets that are respectively disposed on two facing side surfaces of adjacent claw-shaped magnetic poles and that have magnetic fields that are oriented so as to reduce leakage of magnetic flux between the claw-shaped magnetic poles, and a magnetic body is disposed between a pair of the first and second permanent magnets.
    Type: Application
    Filed: July 18, 2008
    Publication date: January 8, 2009
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Masahiko FUJITA, Toshiyuki Yoshizawa, Haruyuki Kometani
  • Publication number: 20080315716
    Abstract: A rotor for an automotive alternator includes a rotary shaft, first and second magnetic pole cores each having a plurality of magnetic pole claws, a bobbin, a field coil, a plurality of permanent magnets, and a positioning mechanism. The magnetic pole claws of the first magnetic pole core are interleaved with those of the second magnetic pole core. The field coil is wound around the first and second magnetic pole cores via the bobbin. The permanent magnets are interposed between the first and second magnetic pole cores. The positioning mechanism, which is made up of at least one of the rotary shaft, the first and second magnetic pole cores, and the bobbin, functions to position the first and second magnetic pole cores in the circumferential direction of the rotary shaft with intervals between adjacent pairs of the magnetic pole claws of the first and second magnetic pole cores being even.
    Type: Application
    Filed: June 20, 2008
    Publication date: December 25, 2008
    Applicant: DENSO CORPORATION
    Inventors: Kenji Itoh, Shigenobu Nakamura, Toshiki Hitomi
  • Patent number: 7466059
    Abstract: Deformation and vibration of claw magnetic poles in rotor are reduced. A rotor includes: a rotor coil 15 for generating a magnetic flux by applying a current; a pole core comprised of a first pole core body 19 and a second pole core body 20 that are disposed so as to cover the rotor coil 15, each being provided with claw-shaped claw magnetic poles 21, 22 engaging with each other; and a magnet assembly 25 composed of a magnet 23 for reducing leakage of magnetic flux and a magnet-holding member 24 for supporting the magnet 23 on the claw magnetic poles 21, 22. Center of gravity 25G of the magnet assembly 25 is located on the base part side nearer than the center of the claw magnetic poles 21, 22.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: December 16, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Naohide Maeda, Yoshihito Asao
  • Publication number: 20080290755
    Abstract: A motor may include an urging member which is mounted on a fixed body for urging the bearing, and a pair of engaging grooves formed on the fixed body. The urging member may includes a pair of hook parts which are bent from respective tip ends of a pair of side plate parts. When the urging member is mounted on the fixed body, a pair of the hook parts are inserted from open ends and engaged with a pair of the engaging grooves and, when an outward force is applied to the urging member, the hook parts abut with an opposite inner wall of the engaging grooves located on a tip end side in the axial line direction of the motor to prevent the hook parts from being disengaged from the engaging grooves.
    Type: Application
    Filed: April 29, 2008
    Publication date: November 27, 2008
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Akira Taruta, Toshio Ueno
  • Publication number: 20080238242
    Abstract: The dynamoelectric machine includes: a Lundell rotor that has: a pole core in which tapered claw-shaped magnetic pole portions are arranged in rows circumferentially so as to extend axially alternately from two axial ends and intermesh with each other; and a field coil that is mounted to the pole core; and a stator that has: a cylindrical stator core that surrounds the rotor so as to have a predetermined air gap; and a stator coil that is mounted to the stator core. The stator core is prepared by laminating and integrating dull finish magnetic steel plates, and a space factor of an iron portion in the stator core is in a range of 96 percent plus or minus 0.5 percent.
    Type: Application
    Filed: March 28, 2008
    Publication date: October 2, 2008
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Toshiyuki YOSHIZAWA, Haruyuki Kometani, Shinji Nishimura, Masahiko Fujita, Masaya Inoue
  • Publication number: 20080211337
    Abstract: The invention relates to a claw pole generator comprising a claw pole rotor, two magnet wheel halves (21, 23) which are mounted on a drive shaft (15) and are provided with claw-shaped magnet poles (22, 24) that mesh with each other, and an annular closing member (10) located between adjacent magnet poles (21, 23). The magnet wheel halves (21, 23) can be inserted into pockets (11) of the closing member (10) along with the magnet poles (22, 24) thereof such that the closing member (10) overlaps the magnet poles (22, 24) on the edge in at least some areas. Also disclosed is a closing member (10).
    Type: Application
    Filed: July 6, 2006
    Publication date: September 4, 2008
    Inventors: Hans-Joachim Lutz, Oliver Gamm, Horst Braun
  • Patent number: 7418843
    Abstract: A washing machine has a tub that may be made of plastic. A drum is rotatably installed in the tub. A shaft may pass through the tub and connect to the drum for transmission of a driving power from a motor to the drum. The washing machine has a bearing supporting part and a stator fastening part extended in a radial direction from the bearing supporting part, where the tub has an inner surface and an outer surface, and the bearing supporting part and the stator fastening part are disposed between the inner surface and the outer surface of the tub.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: September 2, 2008
    Assignee: LG Electronics Inc.
    Inventors: Gon Kim, Chi Wan Hur, Yu Beom Kang, Sang Man Je, Kang Mo Choi, Jae Kyum Kim, Ho Cheol Kwon
  • Patent number: 7420314
    Abstract: An alternating-current dynamoelectric machine according to the present invention includes: a stator including: a stator core in which slots that extend in an axial direction are formed on an inner side; and a stator winding that is mounted to the stator core by winding conducting wires into the slots; and a rotatable rotor including: a field winding that is disposed inside the stator; a rotor core constituted by a first pole core and a second pole core that each have claw-shaped magnetic poles that are disposed so as to cover the field winding and that alternately intermesh with each other; and first and second permanent magnets that are respectively disposed on two facing side surfaces of adjacent claw-shaped magnetic poles and that have magnetic fields that are oriented so as to reduce leakage of magnetic flux between the claw-shaped magnetic poles, and a magnetic body is disposed between a pair of the first and second permanent magnets.
    Type: Grant
    Filed: June 9, 2006
    Date of Patent: September 2, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masahiko Fujita, Toshiyuki Yoshizawa, Haruyuki Kometani
  • Patent number: 7420313
    Abstract: A tandem type rotary generator has a rotary shaft, and two power generating sections disposed adjacent to each other along an axial direction. Each power generating section has a Lundell type rotor core fixed to the rotary shaft, a field coil wound on the rotor core, a stator core disposed on an outside of the rotor core opposite to the rotary shaft in a radial direction, and a stator coil wound on the stator core. A center of the field coil of each power generating section is positioned away from a center of the stator core of the power generating section in the axial direction toward the other power generating section. Two cooling fans cooling the power generating sections are disposed on both sides of the pair of rotor cores in the axial direction.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: September 2, 2008
    Assignee: Denso Corporation
    Inventors: Kazushige Okumoto, Shin Kusase
  • Patent number: 7420312
    Abstract: Provided is a rotating electrical machine including an armature core on which an armature winding is wound; a rotor core which is supported by a rotation axis at a predetermined air gap in an inner diameter side of the armature core, and includes claw-shaped magnetic pole portions in which adjacent magnetic poles have different poles and a cylindrical portion having a field winding; and a permanent magnet which is provided in a magnetic circuit of the rotor core and supplies magnetic flux to the armature core with the field winding, wherein a magnetic short-circuiting mechanism for demagnetizing the magnetic flux of the permanent magnet by deforming a portion of the magnetic short-circuiting mechanism by a centrifugal force and short-circuiting between the magnetic pole portions of the rotor core is provided in the rotor core.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: September 2, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yutaka Kitamura, Yoshihito Asao, Hiroyuki Akita
  • Patent number: 7417350
    Abstract: Reinforcing body retainers are formed on an inner peripheral surface near a tip and near a root of first and second claw-shaped magnetic poles. Reinforcing bodies have a trapezoidal base portion and a pair of wing portions formed on two sides of the base portion, and slits are formed completely across a width direction of the base portion at a central portion in a height direction of the trapezoidal shape of the base portion so as to be offset toward a base of the trapezoidal shape. The reinforcing bodies are disposed so as to contact the inner peripheral surfaces of the first and second claw-shaped magnetic poles with a magnet housed and supported in each of the wing portions, and a D ring is fitted into the slits of the reinforcing bodies.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: August 26, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshinobu Utsumi, Yoshihito Asao
  • Patent number: 7417355
    Abstract: A vehicular tandem type rotary electric machine is disclosed having first and second stator cores 23, 33 having first and second circumferentially spaced slots to accommodate therein first and second stator coils 24, 34, respectively, and first and second Lundell type rotor cores 21, 31 supported on a common rotary shaft 4 in an axially adjacent relationship to be rotatable within the first and second stator cores, respectively, on which first and second field coils 22, 32 are wounded, respectively. Both of the first and second stator coils 24, 34 comprise segments-sequentially-joined stator coils, respectively, each of which includes segment conductors.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: August 26, 2008
    Assignee: Denso Corporation
    Inventors: Akiya Shichijo, Shin Kusase
  • Patent number: 7414342
    Abstract: A magnet-mounting member for holding permanent magnets against side faces of each claw-shaped magnetic pole has pairs of extreme-end and basal-end hooking tabs for preventing displacement of the permanent magnets in either a basal-end or extreme-end direction. The magnet-mounting member is configured such that a function of the basal-end hooking tabs to prevent displacement of the permanent magnets can be disabled by deforming the basal-end hooking tabs. When the magnet-mounting member is forced onto the claw-shaped magnetic pole, the basal-end hooking tabs go into contact with the permanent magnets and deform outward, whereby the magnet-retaining function of the basal-end hooking tabs is disabled. When the magnet-mounting member has been fully pushed onto the claw-shaped magnetic pole, the basal-end hooking tabs resume an original shape to prevent the permanent magnets from being displaced in either direction.
    Type: Grant
    Filed: July 26, 2006
    Date of Patent: August 19, 2008
    Assignee: Mitsubishi Electric Corp.
    Inventors: Naohide Maeda, Masahiko Fujita, Shinya Kudoh