Patents by Inventor Kazuyuki Aono

Kazuyuki Aono 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).

  • Drive control circuit for polyphase motor capable of reducing variation among armature currents of respective phases, and spindle apparatus using the same
    Patent number: 8198852
    Abstract: Even when there is some degree of variation in the characteristics among components constituting a polyphase motor and a driving circuit therefor, current control signals of respective phases being input to the drive circuit have their amplitude finely adjusted by an amplitude control circuit, so that amplitude is uniform among armature currents of respective phases that are ultimately output from the drive circuit. The amplitude adjusting circuit is configured by gain variable amplifiers, for example. Thus, rotation fluctuation and vibration of the polyphase motor can be reduced.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: June 12, 2012
    Assignee: NTN Corporation
    Inventors: Kazuyuki Aono, Akio Nakajima
  • Drive control circuit for polyphase motor capable of reducing variation among armature currents of respective phases, and spindle apparatus using the same
    Publication number: 20080297095
    Abstract: Even when there is some degree of variation in the characteristics among components constituting a polyphase motor and a driving circuit therefor, current control signals of respective phases being input to the drive circuit have their amplitude finely adjusted by an amplitude control circuit, so that amplitude is uniform among armature currents of respective phases that are ultimately output from the drive circuit. The amplitude adjusting circuit is configured by gain variable amplifiers, for example. Thus, rotation fluctuation and vibration of the polyphase motor can be reduced.
    Type: Application
    Filed: May 28, 2008
    Publication date: December 4, 2008
    Inventors: Kazuyuki Aono, Akio Nakajima
  • Externally pressurized gas bearing and spindle equipment using this
    Patent number: 7066652
    Abstract: An externally pressurized gas bearing comprising a main shaft, and journal bearing sections having a plurality of axial gas feed rows each having a plurality of circumferentially equispaced gas feed holes, the gas feed holes in the gas feed rows being adapted to spout compressed gas to thereby rotatably radially support the main shaft in a non-contact state, the externally pressurized gas bearing being arranged so that the gas feed holes in the gas feed row are disposed so as to be positioned circumferentially intermediate between gas feed holes in the adjoining gas feed row.
    Type: Grant
    Filed: April 9, 2003
    Date of Patent: June 27, 2006
    Assignee: NTN Corporation
    Inventors: Yoshio Fujikawa, Kiyotaka Kusunoki, Kazuyuki Aono, Ryu Inoue
  • Externally pressurized gas bearing and spindle equipment using this
    Publication number: 20040109622
    Abstract: An externally pressurized gas bearing comprising a main shaft, and journal bearing sections having a plurality of axial gas feed rows each having a plurality of circumferentially equispaced gas feed holes, the gas feed holes in the gas feed rows being adapted to spout compressed gas to thereby rotatably radially support the main shaft in a non-contact state, the externally pressurized gas bearing being arranged so that the gas feed holes in the gas feed row are disposed so as to be positioned circumferentially intermediate between gas feed holes in the adjoining gas feed row.
    Type: Application
    Filed: April 9, 2003
    Publication date: June 10, 2004
    Inventors: Yoshio Fujikawa, Kiyotaka Kusunoki, Kazuyuki Aono, Ryu Inoue