Patents by Inventor Keiji Okushima

Keiji Okushima 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).

  • Control device for motor/generators
    Patent number: 6486632
    Abstract: A controller for motor/generators is proposed which allows reductions in ripple current generated by an inverter driving a power-generating motor/generator and a vehicle-driving motor/generator. The control device for motor/generators has a first inverter which supplies a control current to a first motor/generator used mainly as an electrical motor, a second inverter which supplies a control current to a second motor/generator used mainly as a generator, a first PWM signal generating circuit which drives the switching elements of the first inverter based on a first carrier signal, a second PWM signal generating circuit which drives the switching elements of the second inverter based on a second carrier signal which has the same period of the first carrier signal.
    Type: Grant
    Filed: July 23, 2001
    Date of Patent: November 26, 2002
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Keiji Okushima, Yasuhiko Kitajima, Shinichiro Kitada, Toshio Kikuchi, Yutaro Kaneko
  • Control device for motor/generators
    Publication number: 20020027789
    Abstract: A controller for motor/generators is proposed which allows reductions in ripple current generated by an inverter driving a power-generating motor/generator and a vehicle-driving motor/generator.
    Type: Application
    Filed: July 23, 2001
    Publication date: March 7, 2002
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Keiji Okushima, Yasuhiko Kitajima, Shinichiro Kitada, Toshio Kikuchi, Yutaro Kaneko