Patents by Inventor Yuuji Funayama

Yuuji Funayama 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).

  • Speed controller of magnetic motor
    Patent number: 8344671
    Abstract: The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value.
    Type: Grant
    Filed: December 11, 2009
    Date of Patent: January 1, 2013
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Kazuaki Tobari, Yasuo Notohara, Wataru Hatsuse, Dongsheng Li, Kentaro Oi, Yuuji Funayama
  • SPEED CONTROLLER OF MAGNETIC MOTOR
    Publication number: 20100148707
    Abstract: The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 17, 2010
    Inventors: Kazuaki TOBARI, Yasuo Notohara, Wataru Hatsuse, Dongsheng Li, Kentaro Oi, Yuuji Funayama