Patents by Inventor Hiroki YOKOUCHI

Hiroki YOKOUCHI 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 drive device, electric oil pump, and method for detecting failure of motor drive device
    Patent number: 11381186
    Abstract: Provided is a motor drive device including a motor having a rotor and a stator, an inverter electrically connected to the motor, and a control device for controlling the inverter. The control device includes: an impedance observer that estimates at least an amount of variation in impedance of the motor on the basis of a voltage command value, a current command value, and an actual current flowing between the inverter and the motor; a comparator that calculates a difference between the current command value and the actual current flowing between the inverter and the motor; and a failure detection unit that outputs a failure flag when the amount of variation in impedance exceeds or falls below a predetermined threshold, or when the difference calculated by the comparator exceeds or falls below a predetermined threshold.
    Type: Grant
    Filed: August 7, 2019
    Date of Patent: July 5, 2022
    Assignee: NIDEC CORPORATION
    Inventors: Hiroki Yokouchi, Shuji Endo
  • MOTOR DRIVE DEVICE, ELECTRIC OIL PUMP, AND METHOD FOR DETECTING FAILURE OF MOTOR DRIVE DEVICE
    Publication number: 20210297026
    Abstract: Provided is a motor drive device including a motor having a rotor and a stator, an inverter electrically connected to the motor, and a control device for controlling the inverter. The control device includes: an impedance observer that estimates at least an amount of variation in impedance of the motor on the basis of a voltage command value, a current command value, and an actual current flowing between the inverter and the motor; a comparator that calculates a difference between the current command value and the actual current flowing between the inverter and the motor; and a failure detection unit that outputs a failure flag when the amount of variation in impedance exceeds or falls below a predetermined threshold, or when the difference calculated by the comparator exceeds or falls below a predetermined threshold.
    Type: Application
    Filed: August 7, 2019
    Publication date: September 23, 2021
    Inventors: Hiroki YOKOUCHI, Shuji ENDO