Patents by Inventor Tatsuo Maetani

Tatsuo Maetani 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: 9071090
    Abstract: A motor includes a stator having a stator iron core wound with stator windings, a rotor rotatably mounted on a shaft, a bearing for supporting the shaft, and a conductive bracket for fixing the bearing. The rotor is formed of a rotary body that holds a permanent magnet and the shaft that extends through the rotary body at center and joined to the rotary body. An electrostatic capacity between the shaft and an outermost wall of the rotary body is set smaller than an electrostatic capacity between an inner ring and an outer ring of the bearing during rotation of the bearing.
    Type: Grant
    Filed: February 2, 2012
    Date of Patent: June 30, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akihiko Watanabe, Tatsuo Maetani, Yoshinori Isomura
  • Patent number: 9059615
    Abstract: A motor of the invention has a rotary body of a rotor, and the rotary body includes an outer core constituting an outer portion of the rotary body, an inner core constituting an inner portion connected to a shaft, and a dielectric layer disposed between the outer core and the inner core. The outer core has a protruding portion that protrudes inward from an inner surface thereof, and the inner core has a protruding portion that protrudes outward from an outer surface thereof, wherein the outer core and the inner core are so disposed that an end face of the protruding portion of the outer core and an end face of the protruding portion of the inner core confront partially with respect to each other.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: June 16, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Takeshi Kowa, Hiroaki Kawasaki, Akihiko Watanabe, Tatsuo Maetani, Yoshinori Isomura
  • Publication number: 20140015363
    Abstract: A motor of the invention has a rotary body of a rotor, and the rotary body includes an outer core constituting an outer portion of the rotary body, an inner core constituting an inner portion connected to a shaft, and a dielectric layer disposed between the outer core and the inner core. The outer core has a protruding portion that protrudes inward from an inner surface thereof, and the inner core has a protruding portion that protrudes outward from an outer surface thereof, wherein the outer core and the inner core are so disposed that an end face of the protruding portion of the outer core and an end face of the protruding portion of the inner core confront partially with respect to each other.
    Type: Application
    Filed: April 19, 2013
    Publication date: January 16, 2014
    Applicant: Panasonic Corporation
    Inventors: Takeshi KOWA, Hiroaki KAWASAKI, Akihiko WATANABE, Tatsuo MAETANI, Yoshinori ISOMURA
  • Patent number: 8546989
    Abstract: An electric motor includes a stator that has a stator winding wound on a stator iron core; a rotor having a rotating body with a rotating shaft in the center; a bearing for journaling the rotating shaft; and two conductive brackets for fixing the bearing. The rotating body holds a magnet such that the magnet faces the stator, and is fastened to the rotating shaft penetrating through the center of the rotating body. In the rotating body, a dielectric layer is formed between the rotating shaft and the outer circumference of the rotating body. The dielectric layer has a polygonal shape with the rotating shaft in the center. An electric device includes the thus configured electric motor.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: October 1, 2013
    Assignee: Panasonic Corporation
    Inventors: Akihiko Watanabe, Yoshinori Isomura, Tatsuo Maetani, Hiroki Sato
  • Publication number: 20130119806
    Abstract: An electric motor includes a stator that has a stator winding wound on a stator iron core; a rotor having a rotating body with a rotating shaft in the center; a bearing for journaling the rotating shaft; and two conductive brackets for fixing the bearing. The rotating body holds a magnet such that the magnet faces the stator, and is fastened to the rotating shaft penetrating through the center of the rotating body. In the rotating body, a dielectric layer is formed between the rotating shaft and the outer circumference of the rotating body. The dielectric layer has a polygonal shape with the rotating shaft in the center. An electric device includes the thus configured electric motor.
    Type: Application
    Filed: February 28, 2012
    Publication date: May 16, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Akihiko Watanabe, Yoshinori Isomura, Tatsuo Maetani, Hiroki Sato
  • Publication number: 20120286608
    Abstract: A rolling bearing for an inverter-driven motor has the thickness of an oil film in a steady operation condition stably maintained in a specific range, by which the withstand voltage can be controlled, and the discharge due to the shaft voltage of the inverter-driven motor is prevented and electrolytic corrosion can be suppressed. The rolling bearing for an inverter-driven motor has an inner ring, an outer ring, a rolling element, and grease, wherein a root mean square roughness of a raceway surface of at least one of the inner ring and the outer ring is 4 to 16 nm, and an oil film parameter ? in steady operation is at least 17.5.
    Type: Application
    Filed: May 8, 2012
    Publication date: November 15, 2012
    Applicants: PANASONIC CORPORATION, MINEBEA CO., LTD.
    Inventors: Hiroshi KOMIYAMA, Shinichi MACHIDA, Tatsuo MAETANI, Yoshinori ISOMURA
  • Publication number: 20120274157
    Abstract: A motor includes a stator having a stator iron core wound with stator windings, a rotor rotatably mounted on a shaft, a bearing for supporting the shaft, and a conductive bracket for fixing the bearing. The rotor is formed of a rotary body that holds a permanent magnet and the shaft that extends through the rotary body at center and joined to the rotary body. An electrostatic capacity between the shaft and an outermost wall of the rotary body is set smaller than an electrostatic capacity between an inner ring and an outer ring of the bearing during rotation of the bearing.
    Type: Application
    Filed: February 2, 2012
    Publication date: November 1, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Akihiko Watanabe, Tatsuo Maetani, Yoshinori Isomura