Patents by Inventor Harunori Imagawa

Harunori Imagawa 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).

  • Motor-driven power steering apparatus
    Patent number: 7392879
    Abstract: In a motor-driven power steering apparatus, the main coil winding and auxiliary coil winding are wound around the same slot of a stator core in a parallel manner, a motor drive means has a main driver feeding at least to the main coil windings, and an auxiliary driver feeding only to the auxiliary coil windings, the main driver being actuated so as to be capable of assisting the steering during normal conditions of a control system of an electric motor, and the auxiliary driver is actuated so as to execute an auxiliary assist corresponding to a motor friction torque under abnormal conditions of the control system of the electric motor.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: July 1, 2008
    Assignee: Showa Corporation
    Inventors: Harunori Imagawa, Yoshitaka Kubo, Akira Fujisaki
  • Motor-driven power steering apparatus
    Patent number: 7187153
    Abstract: In a motor-driven power steering apparatus, a plurality of rotational position detecting sensors are provided in an electric motor, and during an abnormality in any one rotational sensor, the electric motor can be driven by using a detected result of any other one rotational position detecting sensor.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: March 6, 2007
    Assignee: Showa Corporation
    Inventors: Harunori Imagawa, Yoshitaka Kubo, Akira Fujisaki
  • Motor-driven power steering apparatus
    Publication number: 20060220607
    Abstract: In a motor-driven power steering apparatus, a plurality of rotational position detecting sensors are provided in an electric motor, and during an abnormality in any one rotational sensor, the electric motor can be driven by using a detected result of any other one rotational position detecting sensor.
    Type: Application
    Filed: September 15, 2005
    Publication date: October 5, 2006
    Inventors: Harunori Imagawa, Yoshitaka Kubo, Akira Fujisaki
  • Motor-driven power steering apparatus
    Publication number: 20060219470
    Abstract: In a motor-driven power steering apparatus, the main coil winding and auxiliary coil winding are wound around the same slot of a stator core in a parallel manner, a motor drive means has a main driver feeding at least to the main coil windings, and an auxiliary driver feeding only to the auxiliary coil windings, the main driver being actuated so as to be capable of assisting the steering during normal conditions of a control system of an electric motor, and the auxiliary driver is actuated so as to execute an auxiliary assist corresponding to a motor friction torque under abnormal conditions of the control system of the electric motor.
    Type: Application
    Filed: September 15, 2005
    Publication date: October 5, 2006
    Inventors: Harunori Imagawa, Yoshitaka Kubo, Akira Fujisaki