Patents by Inventor Wang Hay Kenneth Tsui

Wang Hay Kenneth Tsui 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).

  • Model-based active electronic damping for stepper motors
    Patent number: 7733051
    Abstract: A method for damping vibrations in a stepper motor with micro-stepping control which comprises the steps of identifying the force amplitudes and phase shifts of multiple harmonic detent torques of the stepper motor, such as the first, second and fourth harmonic detent torques, and tuning the stepper motor with different current commands until minimum friction and resistive torque are obtained. Thereafter, a compensating harmonic current derived from said force amplitudes and phase shifts of the said multiple harmonic detent torques is injected into a current command during operation of the stepper motor to compensate for torque ripples.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: June 8, 2010
    Assignee: ASM Assembly Automation Ltd.
    Inventors: Wang Hay Kenneth Tsui, Wai Chuen Gan, Shing Wai Tam, Gang Ou, Hon Yu Peter Ng
  • MODEL-BASED ACTIVE ELECTRONIC DAMPING FOR STEPPER MOTORS
    Publication number: 20080116835
    Abstract: A method for damping vibrations in a stepper motor with micro-stepping control which comprises the steps of identifying the force amplitudes and phase shifts of multiple harmonic detent torques of the stepper motor, such as the first, second and fourth harmonic detent torques, and tuning the stepper motor with different current commands until minimum friction and resistive torque are obtained. Thereafter, a compensating harmonic current derived from said force amplitudes and phase shifts of the said multiple harmonic detent torques is injected into a current command during operation of the stepper motor to compensate for torque ripples.
    Type: Application
    Filed: November 19, 2007
    Publication date: May 22, 2008
    Inventors: Wang Hay Kenneth TSUI, Wai Chuen GAN, Shing Wai TAM, Gang OU, Hon Yu Peter NG