Patents by Inventor Hirofumi Mizukami

Hirofumi Mizukami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9644635
    Abstract: Fan (3) includes suction-side shroud (3a) and suction port (22) at the center portion of suction-side shroud (3a). Fan case (2) includes opening part (13) at a location facing suction port (22). Fan seal (4) is disposed between inner wall surface (2a) of fan case (2) and suction port-side end surface (3b) of suction-side shroud (3a). Opening part (13) includes a plurality of mushroom-shaped anchors (2b). Fan seal (4) includes holding parts (4b) that fit onto mushroom-shaped anchors (2b). Fan seal (4) is press-fitted onto fan case (2) that includes mushroom-shaped anchors (2b).
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: May 9, 2017
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hirofumi Mizukami, Tetsuo Shimasaki
  • Patent number: 8987955
    Abstract: A stator, a rotor, bearings, and conductive brackets are provided. The stator has a stator iron core having a winding wound thereon. The rotor has a rotating body that holds a permanent magnet in the circumferential direction so that the permanent magnet faces the stator, and a shaft that has the rotating body fastened thereto so as to penetrate through the center of the rotating body. Both of the bearing on the output shaft side and the bearing opposite the output shaft side journal the shaft. One of the brackets fixes the bearing on the output shaft side, and the other of the brackets fixes the bracket opposite the output shaft side. The brackets are electrically connected to each other, and a dielectric layer is formed between the shaft and the outer periphery of the rotating body.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: March 24, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
  • Patent number: 8975796
    Abstract: A motor includes a stator integrally molded together with a stator member, which includes a stator iron-core wound with a winding, by insulating resin, a rotor mounted on a shaft as a center and confronting the stator, two bearings supporting the shaft rotatably, brackets fixing the bearings, and a drive circuit board including a drive circuit which supplies an electric current to the winding and drives the rotor. Either one of the two bearings includes an outer ring and an inner ring both of which are electrically insulated from each other.
    Type: Grant
    Filed: March 29, 2010
    Date of Patent: March 10, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Haruhiko Kado, Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa
  • Patent number: 8957553
    Abstract: A brushless motor includes a stator molded integrally with a resin having a fixing member including a stator iron core and a winding wound thereon, a rotor of a disk-like iron core holding a ferrite resin magnet in a circumferential direction, the rotor arranged to face the stator about a shaft, a bearing rotatably supporting the shaft, and conductive brackets fixing the bearing. The brackets are electrically connected to each other with a conducting pin in the stator.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: February 17, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takehiko Hasegawa, Hirofumi Mizukami, Akihiko Watanabe, Haruhiko Kado
  • Publication number: 20140369870
    Abstract: Fan (3) includes suction-side shroud (3a) and suction port (22) at the center portion of suction-side shroud (3a). Fan case (2) includes opening part (13) at a location facing suction port (22). Fan seal (4) is disposed between inner wall surface (2a) of fan case (2) and suction port-side end surface (3b) of suction-side shroud (3a). Opening part (13) includes a plurality of mushroom-shaped anchors (2b). Fan seal (4) includes holding parts (4b) that fit onto mushroom-shaped anchors (2b). Fan seal (4) is press-fitted onto fan case (2) that includes mushroom-shaped anchors (2b).
    Type: Application
    Filed: March 4, 2013
    Publication date: December 18, 2014
    Inventors: Hirofumi Mizukami, Tetsuo Shimasaki
  • Patent number: 8901788
    Abstract: Provided is an electric motor driven by an inverter of PWM method, and devised to retard electrolytic corrosion in a bearing. A rotating body of a rotor comprises an outer iron core configuring an outer peripheral portion of the rotating body, an inner iron core configuring an inner peripheral portion connected to a shaft, a dielectric layer disposed between the outer iron core and the inner iron core, a plurality of insertion holes penetrating the outer iron core in the axial direction, and permanent magnets inserted individually in the plurality of insertion holes. It thus becomes possible to increase impedance of the rotor side (inner ring side of bearing) to approximate it to impedance of the stator side (outer ring side of the bearing) to thereby bring high frequency potentials balanced between the inner ring side and the outer ring side of the bearing, so as to provide the electric motor that retards electrolytic corrosion liable to occur in the bearing, and an electric device equipped with the same.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: December 2, 2014
    Assignee: Panasonic Corporation
    Inventors: Akihiko Watanabe, Takehiko Hasegawa, Hirofumi Mizukami, Haruhiko Kado, Genki Kondo
  • Patent number: 8587167
    Abstract: A motor includes: a stator molded integrally with an insulating resin having a fixing member including a stator iron core and a winding wound thereon; a rotor arranged to face the stator about a shaft; a bearing rotatably supporting the shaft; a bracket fixing the bearing; and a drive circuit substrate having a drive circuit mounted thereon for driving the winding. The stator iron core is electrically connected to a ground serving as a reference point of a zero potential on the drive circuit substrate through a conductive member.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: November 19, 2013
    Assignee: Panasonic Corporation
    Inventors: Haruhiko Kado, Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa
  • Patent number: 8552601
    Abstract: An electric motor includes a stator including stator steel core (11) around which a coil is wound; a rotor which includes rotating body (30) that holds a plurality of permanent magnets (32) in the circumferential direction to face the stator, and shaft (16) that fastens rotating body (30) so as to penetrate the center of rotating body (30); a bearing (15) for supporting shaft (16); and bracket (17) for fixing bearing (15), wherein dielectric layer (50) is provided between shaft (16) and the outer periphery of rotating body (30).
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: October 8, 2013
    Assignee: Panasonic Corporation
    Inventors: Hirofumi Mizukami, Akihiko 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
  • Patent number: 8525374
    Abstract: Provided is an electric motor that has a stator including a stator iron core having a stator winding, a rotor including a rotary member and a shaft, a bearing for supporting the shaft, and a bracket for fixing the bearing. Further included is an impedance adjusting member for adjusting at least one impedance of the impedance between the stator winding and the inner ring of the bearing, and the impedance between the stator winding and the outer ring of the bearing. The impedance adjusting member is a matching member for matching the individual impedances. The matching member is a capacitor interposed between the stator iron core and the bracket.
    Type: Grant
    Filed: June 24, 2008
    Date of Patent: September 3, 2013
    Assignee: Panasonic Corporation
    Inventors: Hirofumi Mizukami, Akihiko Watanabe
  • Patent number: 8502427
    Abstract: A motor includes: a stator including a stator iron core on which a winding is wound; a rotor including a rotating body that holds a magnet in a circumferential direction to face the stator and a shaft that fastens the rotating body to penetrate a center of the rotating body; a bearing that supports the shaft; and two conductive brackets that fix the bearing. The two brackets are electrically connected to each other, and a capacitor serving as an impedance adjusting member that adjusts impedances between the stator iron core and the electrically connected two brackets is arranged.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: August 6, 2013
    Assignee: Panasonic Corporation
    Inventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
  • Publication number: 20130043748
    Abstract: A stator, a rotor, bearings, and conductive brackets are provided. The stator has a stator iron core having a winding wound thereon. The rotor has a rotating body that holds a permanent magnet in the circumferential direction so that the permanent magnet faces the stator, and a shaft that has the rotating body fastened thereto so as to penetrate through the center of the rotating body. Both of the bearing on the output shaft side and the bearing opposite the output shaft side journal the shaft. One of the brackets fixes the bearing on the output shaft side, and the other of the brackets fixes the bracket opposite the output shaft side. The brackets are electrically connected to each other, and a dielectric layer is formed between the shaft and the outer periphery of the rotating body.
    Type: Application
    Filed: May 12, 2010
    Publication date: February 21, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
  • Patent number: 8242659
    Abstract: The mold commutator of the present invention comprises a plurality of commutator segments made of copper or copper alloy and circumferentially arranged, a plurality of spark absorbing elements, disposed between adjacent commutator segments, with paired parallel surfaces respectively having electrodes thereon, and a resin mold portion which integrates these portions into one piece. The spark absorbing element is electrically connected to the commutator segment via the electrode, and spark voltage generated at the commutator segment is absorbed by current flowing between the electrodes.
    Type: Grant
    Filed: April 8, 2008
    Date of Patent: August 14, 2012
    Assignee: Panasonic Corporation
    Inventors: Noriteru Maeda, Hirofumi Mizukami, Akihiko Yamazaki, Seiji Kurozumi, Yoshikazu Yamagata
  • Patent number: 8176619
    Abstract: A method of manufacturing a molded commutator for a vacuum cleaner motor, includes providing a cylindrical molding ring; arranging commutator segments in a circle along an inner periphery of the cylindrical molding ring such that grooves are formed between adjacent pairs of the commutator segments and the grooves are extended orthogonal to the rotating direction; press-fitting cylindrical varistors between the commutator segments, with a press-fitting load for each of the varistors ranging from 2 kN to 5 kN; and resin-molding the commutator segments and the varistors together with a molding material so as to maintain integral engagement of the commutator segments and the varistors; wherein the commutator segments are of copper alloy containing silver, and the varistors are of zinc oxide compounds; wherein side surfaces of the varistors contact with the adjacent pairs of commutator segments; and flexible metal is printed on the contacting side surfaces of the varistors.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: May 15, 2012
    Assignee: Panasonic Corporation
    Inventors: Hirofumi Mizukami, Noriteru Maeda
  • Publication number: 20120112588
    Abstract: Provided is an electric motor driven by an inverter of PWM method, and devised to retard electrolytic corrosion in a bearing. A rotating body of a rotor comprises an outer iron core configuring an outer peripheral portion of the rotating body, an inner iron core configuring an inner peripheral portion connected to a shaft, a dielectric layer disposed between the outer iron core and the inner iron core, a plurality of insertion holes penetrating the outer iron core in the axial direction, and permanent magnets inserted individually in the plurality of insertion holes. It thus becomes possible to increase impedance of the rotor side (inner ring side of bearing) to approximate it to impedance of the stator side (outer ring side of the bearing) to thereby bring high frequency potentials balanced between the inner ring side and the outer ring side of the bearing, so as to provide the electric motor that retards electrolytic corrosion liable to occur in the bearing, and an electric device equipped with the same.
    Type: Application
    Filed: September 7, 2010
    Publication date: May 10, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Akihiko Watanabe, Takehiko Hasegawa, Hirofumi Mizukami, Haruhiko Kado, Genki Kondo
  • Publication number: 20120038229
    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: Application
    Filed: February 26, 2010
    Publication date: February 16, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa, Haruhiko Kado
  • Publication number: 20120032536
    Abstract: A motor includes a stator integrally molded together with a stator member, which includes a stator iron-core wound with a winding, by insulating resin, a rotor mounted on a shaft as a center and confronting the stator, two bearings supporting the shaft rotatably, brackets fixing the bearings, and a drive circuit board including a drive circuit which supplies an electric current to the winding and drives the rotor. Either one of the two bearings includes an outer ring and an inner ring both of which are electrically insulated from each other.
    Type: Application
    Filed: March 29, 2010
    Publication date: February 9, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Haruhiko Kado, Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa
  • Publication number: 20110234026
    Abstract: A motor includes: a stator including a stator iron core on which a winding is wound; a rotor including a rotating body that holds a magnet in a circumferential direction to face the stator and a shaft that fastens the rotating body to penetrate a center of the rotating body; a bearing that supports the shaft; and two conductive brackets that fix the bearing. The two brackets are electrically connected to each other, and a capacitor serving as an impedance adjusting member that adjusts impedances between the stator iron core and the electrically connected two brackets is arranged.
    Type: Application
    Filed: December 11, 2009
    Publication date: September 29, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Hirofumi Mizukami, Akihiko Watanabe, Takehiko Hasegawa, Haruhiko Kado
  • Publication number: 20110234025
    Abstract: A motor includes: a stator molded integrally with an insulating resin having a fixing member including a stator iron core and a winding wound thereon; a rotor arranged to face the stator about a shaft; a bearing rotatably supporting the shaft; a bracket fixing the bearing; and a drive circuit substrate having a drive circuit mounted thereon for driving the winding. The stator iron core is electrically connected to a ground serving as a reference point of a zero potential on the drive circuit substrate through a conductive member.
    Type: Application
    Filed: December 11, 2009
    Publication date: September 29, 2011
    Applicant: Panasonic Corporation
    Inventors: Haruhiko Kado, Akihiko Watanabe, Hirofumi Mizukami, Takehiko Hasegawa
  • Publication number: 20110234024
    Abstract: A brushless motor includes a stator molded integrally with a resin having a fixing member including a stator iron core and a winding wound thereon, a rotor of a disk-like iron core holding a ferrite resin magnet in a circumferential direction, the rotor arranged to face the stator about a shaft, a bearing rotatably supporting the shaft, and conductive brackets fixing the bearing. The brackets are electrically connected to each other with a conducting pin in the stator.
    Type: Application
    Filed: December 11, 2009
    Publication date: September 29, 2011
    Inventors: Takehiko Hasegawa, Hirofumi Mizukami, Akihiko Watanabe, Haruhiko Kado