Patents by Inventor Yam Pheng Tham

Yam Pheng Tham 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).

  • System and method for low acoustic noise spindle motor commutation
    Patent number: 6215266
    Abstract: A system for low acoustic noise spindle motor commutation is disclosed. The system contains a control device that generates commutation control signals which cause spindle motor drivers to source or sink current through windings of a spindle motor. The windings create electromagnetic fields which induce rotational movement in a spindle motor rotor. Low acoustic noise snubber devices are coupled to each winding and are dynamically configurable by the control device to provide low spindle motor driver charging current upon initial application of power to the spindle motor, and reduced acoustic noise and back EMF-generated current and voltage surges at the spindle motor driver during spindle motor commutation.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: April 10, 2001
    Assignee: Seagate Technology LLC
    Inventors: Nan Ling Goh, James Lai Kein Chang, Yam Pheng Tham, Utt Heng Kan, Kah Liang Gan