Patents by Inventor Kouichi NAMPEI

Kouichi NAMPEI 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).

  • Patent number: 11001295
    Abstract: A motor control device for performing PWM control of an inverter for driving a three-phase brushless motor on the basis of a current command value, wherein the motor control device is provided with: a voltage command value computation unit for calculating a voltage command value using the current command value, and a motor rotation speed and a motor electric angle acquired for each control cycle from the three-phase brushless motor; an electric angle interpolation unit for estimating an interpolated electric angle from the motor electric angle at division intervals obtained by dividing the control cycle; a conversion unit for calculating a three-phase Duty command value from the voltage command value and the motor electric angle, and calculating a three-phase interpolated Duty command value from the voltage command value and the interpolated electric angle; and an output setting unit for switching between, and outputting, the three-phase Duty command value and the three-phase interpolated Duty command value s
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: May 11, 2021
    Assignee: NSK LTD.
    Inventors: Hiroaki Takase, Ryo Minaki, Takayoshi Sugawara, Kouichi Nampei
  • Publication number: 20200255055
    Abstract: A motor control device for performing PWM control of an inverter for driving a three-phase brushless motor on the basis of a current command value, wherein the motor control device is provided with: a voltage command value computation unit for calculating a voltage command value using the current command value, and a motor rotation speed and a motor electric angle acquired for each control cycle from the three-phase brushless motor; an electric angle interpolation unit for estimating an interpolated electric angle from the motor electric angle at division intervals obtained by dividing the control cycle; a conversion unit for calculating a three-phase Duty command value from the voltage command value and the motor electric angle, and calculating a three-phase interpolated Duty command value from the voltage command value and the interpolated electric angle; and an output setting unit for switching between, and outputting, the three-phase Duty command value and the three-phase interpolated Duty command value s
    Type: Application
    Filed: October 26, 2018
    Publication date: August 13, 2020
    Applicant: NSK Ltd.
    Inventors: Hiroaki TAKASE, Ryo MINAKI, Takayoshi SUGAWARA, Kouichi NAMPEI
  • Patent number: 10471985
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that improves a discontinuous feeling of an assist by flexibly making an adjustment of a current command value of a normal system when a failure occurs in any system of multi-system motor control, and enables smooth handling, and to provide an electric power steering apparatus and a vehicle equipped with the same.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: November 12, 2019
    Assignee: NSK LTD.
    Inventors: Kouichi Nampei, Yoshihiro Aosaki
  • Patent number: 10252745
    Abstract: There are provided a motor control apparatus, an electric power steering apparatus, and a vehicle, capable of controlling the driving of an electric motor accurately even when a failure occurs in a motor electric angle detecting unit that detects a motor electric angle.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: April 9, 2019
    Assignee: NSK, Ltd.
    Inventor: Kouichi Nampei
  • Publication number: 20180290682
    Abstract: [Problem] An object of the present invention is to provide a motor control unit that improves a discontinuous feeling of an assist by flexibly making an adjustment of a current command value of a normal system when a failure occurs in any system of multi-system motor control, and enables smooth handling, and to provide an electric power steering apparatus and a vehicle equipped with the same.
    Type: Application
    Filed: March 9, 2016
    Publication date: October 11, 2018
    Applicant: NSK LTD.
    Inventors: Kouichi NAMPEI, Yoshihiro AOSAKI
  • Patent number: 10056854
    Abstract: A motor control unit that does not make an occurrence of a noisy sound and a vibration and does not give a steering discomfort by changing parameters of a current feedback control section even if an electric characteristic of the motor varies with a system-switching due to a failure occurrence, and to an electric power steering apparatus using the same and a vehicle. The motor control unit controls a motor having multi-system motor windings by means of a 3-phase current feedback system provided with a current control section through a motor driving circuit of each winding system, having a function that changes by switching parameters of the current control section corresponding to a driving system number of the multi-system motor windings.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: August 21, 2018
    Assignee: NSK LTD.
    Inventors: Kenji Mori, Kouichi Nampei, Yoshihiro Aosaki
  • Publication number: 20180093702
    Abstract: There are provided a motor control apparatus, an electric power steering apparatus, and a vehicle, capable of controlling the driving of an electric motor accurately even when a failure occurs in a motor electric angle detecting unit that detects a motor electric angle.
    Type: Application
    Filed: July 25, 2016
    Publication date: April 5, 2018
    Inventor: Kouichi NAMPEI
  • Publication number: 20170117833
    Abstract: A motor control unit that does not make an occurrence of a noisy sound and a vibration and does not give a steering discomfort by changing parameters of a current feedback control section even if an electric characteristic of the motor varies with a system-switching due to a failure occurrence, and to an electric power steering apparatus using the same and a vehicle. The motor control unit controls a motor having multi-system motor windings by means of a 3-phase current feedback system provided with a current control section through a motor driving circuit of each winding system, having a function that changes by switching parameters of the current control section corresponding to a driving system number of the multi-system motor windings.
    Type: Application
    Filed: July 13, 2015
    Publication date: April 27, 2017
    Applicant: NSK LTD.
    Inventors: Kenji MORI, Kouichi NAMPEI, Yoshihiro AOSAKI