Patents by Inventor Reo Arai

Reo Arai 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).

  • Electric motor having stator core for reducing cogging torque
    Patent number: 9293974
    Abstract: An electric motor includes a stator having a core back which varies in width in a circumferential direction, and a rotor provided with permanent magnets. In the electric motor, cogging torque is generated M times during one revolution of the rotor, due to the number of magnetic poles of the rotor and the varied shape of the core back. The core back is provided with a step shift by an angle obtained by multiplying (360/M/2) degrees with an odd number. According to one embodiment, the core back may be provided with holes, concave portions or convex portions, so as to provide the core back with the step shift.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: March 22, 2016
    Assignee: Fanuc Corporation
    Inventors: Takuya Maeda, Reo Arai
  • ELECTRIC MOTOR HAVING STATOR CORE FOR REDUCING COGGING TORQUE
    Publication number: 20140103755
    Abstract: An electric motor includes a stator having a core back which varies in width in a circumferential direction, and a rotor provided with permanent magnets. In the electric motor, cogging torque is generated M times during one revolution of the rotor, due to the number of magnetic poles of the rotor and the varied shape of the core back. The core back is provided with a step shift by an angle obtained by multiplying (360/M/2) degrees with an odd number. According to one embodiment, the core back may be provided with holes, concave portions or convex portions, so as to provide the core back with the step shift.
    Type: Application
    Filed: October 16, 2013
    Publication date: April 17, 2014
    Applicant: FANUC CORPORATION
    Inventors: Takuya Maeda, Reo Arai