Patents by Inventor Saha Subrata

Saha Subrata 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 drive control method and apparatus
    Patent number: 7728541
    Abstract: An electric motor drive control method includes deriving a target current from a target torque to apply electric current corresponding to the target current to an electric motor. When a rotation speed of the motor is in a predetermined speed region, including a zero rotation speed at which the target current for driving the motor allocated to the target torque is switched discontinuously, the target current corresponding to the rotation speed is obtained through a linear interpolation using the rotation speed and target currents at a traction side and a regeneration side allocated to the target torque such that the electric current corresponding to the target current is applied to the motor.
    Type: Grant
    Filed: August 10, 2007
    Date of Patent: June 1, 2010
    Assignee: Aisin AW Co., Ltd.
    Inventors: Saha Subrata, Zhigian Chen
  • Electric motor drive control method and apparatus
    Publication number: 20080042605
    Abstract: An electric motor drive control method includes deriving a target current from a target torque to apply electric current corresponding to the target current to an electric motor. When a rotation speed of the motor is in a predetermined speed region, including a zero rotation speed at which the target current for driving the motor allocated to the target torque is switched discontinuously, the target current corresponding to the rotation speed is obtained through a linear interpolation using the rotation speed and target currents at a traction side and a regeneration side allocated to the target torque such that the electric current corresponding to the target current is applied to the motor.
    Type: Application
    Filed: August 10, 2007
    Publication date: February 21, 2008
    Applicant: AISIN AW CO., LTD.
    Inventors: Saha Subrata, Zhigian Chen