Patents by Inventor Akiharu HIROMOTO

Akiharu HIROMOTO 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).

  • Brushless motor and fan using the motor
    Patent number: 10047754
    Abstract: A brushless motor 5 of the present invention comprises: a rotor magnet 13 having a magnetized circumferential surface 13a comprising an upper circumferential surface 13a1 magnetized with a plurality of magnetic poles and a lower circumferential surface 13a2 magnetized with a plurality of magnetic poles; and a stator 30 having a stator stack 31 at least partially facing the lower circumferential surface 13a2, wherein the upper circumferential surface 13a1 of the rotor magnet 13 has a surface magnetic flux density of substantially the same level from a center of a magnetic pole until a vicinity of an adjacent magnetic pole, and the lower circumferential surface 13a2 of the rotor magnet 13 has a surface magnetic flux density decreasing from a center of a magnetic pole toward an adjacent magnetic pole.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: August 14, 2018
    Assignee: MINEBEA MITSUMI INC.
    Inventor: Akiharu Hiromoto
  • BRUSHLESS MOTOR AND FAN USING THE MOTOR
    Publication number: 20150093271
    Abstract: A brushless motor 5 of the present invention comprises: a rotor magnet 13 having a magnetized circumferential surface 13a comprising an upper circumferential surface 13a1 magnetized with a plurality of magnetic poles and a lower circumferential surface 13a2 magnetized with a plurality of magnetic poles; and a stator 30 having a stator stack 31 at least partially facing the lower circumferential surface 13a2, wherein the upper circumferential surface 13a1 of the rotor magnet 13 has a surface magnetic flux density of substantially the same level from a center of a magnetic pole until a vicinity of an adjacent magnetic pole, and the lower circumferential surface 13a2 of the rotor magnet 13 has a surface magnetic flux density decreasing from a center of a magnetic pole toward an adjacent magnetic pole.
    Type: Application
    Filed: September 19, 2014
    Publication date: April 2, 2015
    Inventor: Akiharu HIROMOTO