Patents by Inventor Wai-Loon Sum

Wai-Loon Sum 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 and control method for servo motor system
    Patent number: 10379526
    Abstract: A control device for a servo motor system is provided. The control device includes a segment parameter storage circuit, a velocity superposing circuit, a velocity transferring circuit and a pulse comparison circuit. The segment parameter storage circuit is electrically connected with the velocity superposing circuit and the pulse comparison circuit. The velocity transferring circuit is connected between the velocity superposing circuit and the pulse comparison circuit. The velocity superposing circuit updates a present velocity value according to a target velocity value and an increment. The velocity transferring circuit generates a PWM signal according to the present velocity value. The pulse comparison circuit transfers the PWM signal into a signal of a command pulse wave group and judges whether a pulse number of the PWM signal reaches a predetermined pulse number.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: August 13, 2019
    Assignee: RDC SEMICONDUCTOR CO., LTD.
    Inventors: Wai-Loon Sum, Bo-Yuan Shih
  • CONTROL DEVICE AND CONTROL METHOD FOR SERVO MOTOR SYSTEM
    Publication number: 20170060119
    Abstract: A control device for a servo motor system is provided. The control device includes a segment parameter storage circuit, a velocity superposing circuit, a velocity transferring circuit and a pulse comparison circuit. The segment parameter storage circuit is electrically connected with the velocity superposing circuit and the pulse comparison circuit. The velocity transferring circuit is connected between the velocity superposing circuit and the pulse comparison circuit. The velocity superposing circuit updates a present velocity value according to a target velocity value and an increment. The velocity transferring circuit generates a PWM signal according to the present velocity value. The pulse comparison circuit transfers the PWM signal into a signal of a command pulse wave group and judges whether a pulse number of the PWM signal reaches a predetermined pulse number.
    Type: Application
    Filed: December 17, 2015
    Publication date: March 2, 2017
    Inventors: Wai-Loon Sum, Bo-Yuan Shih