Patents by Inventor Ying-Yu Tzou

Ying-Yu Tzou 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).

  • SENSORLESS START-UP METHOD FOR DRIVING A BRUSHLESS DC MOTOR
    Publication number: 20080067961
    Abstract: At first, a plurality of detection modes are applied in sequence to a brushless DC motor, such that with respect to each of the detection modes a composite magnetic field generated by a motor current flowing through motor coils points in a different direction. Then, each of peak values of the motor currents generated by the detection modes is compared with respect to one another so as to select, from the plurality of detection modes, one detection mode which generates a largest one of the peak values of the motor currents. An initial position of a rotor is determined on a basis of a direction of a composite magnetic field generated by the detection mode which generates the largest one of the peak values of the motor currents. Based on the initial position of the rotor, the brushless DC motor is driven to start rotating.
    Type: Application
    Filed: September 20, 2006
    Publication date: March 20, 2008
    Inventors: Yen-Chuan Chang, Ying-Yu Tzou
  • Sensorless start-up method for driving a brushless DC motor
    Patent number: 7334854
    Abstract: At first, a plurality of detection modes are applied in sequence to a brushless DC motor, such that with respect to each of the detection modes a composite magnetic field generated by a motor current flowing through motor coils points in a different direction. Then, each of peak values of the motor currents generated by the detection modes is compared with respect to one another so as to select, from the plurality of detection modes, one detection mode which generates a largest one of the peak values of the motor currents. An initial position of a rotor is determined on a basis of a direction of a composite magnetic field generated by the detection mode which generates the largest one of the peak values of the motor currents. Based on the initial position of the rotor, the brushless DC motor is driven to start rotating.
    Type: Grant
    Filed: September 20, 2006
    Date of Patent: February 26, 2008
    Assignee: Aimtron Technology Corp.
    Inventors: Yen-Chuan Chang, Ying-Yu Tzou