Patents by Inventor Nai Lap Lee

Nai Lap Lee 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).

  • Method for controlling two-phase stepping motor
    Patent number: 7362072
    Abstract: A method of controlling a two-phase stepping motor to operate in one of a plurality of operating modes in which output of the motor behaves differently upon encountering obstacle, comprises the steps of: generating an electrical driving current comprising a repeating series of a positive active driving region, a first inactive driving region, a negative active driving region and a second inactive driving region; determining one of the duration of the active driving regions and the duration of the inactive driving regions relative to the other of the durations to thereby cause the motor to operate in a corresponding mode of the operating modes; and applying the driving current to the motor.
    Type: Grant
    Filed: May 9, 2006
    Date of Patent: April 22, 2008
    Inventors: Ferenc Fekete, Ming Ki Au, Celement Chiu Sing Tse, Kenny Chi Ken Lee, Chi Keung Tang, Man Keung Mak, Ming Lam Ng, Kwok Kit Mak, Nai Lap Lee
  • Method for controlling two-phase stepping motor
    Publication number: 20060255761
    Abstract: A method of controlling a two-phase stepping motor to operate in one of a plurality of operating modes in which output of the motor behaves differently upon encountering obstacle, comprises the steps of: generating an electrical driving current comprising a repeating series of a positive active driving region, a first inactive driving region, a negative active driving region and a second inactive driving region; determining one of the duration of the active driving regions and the duration of the inactive driving regions relative to the other of the durations to thereby cause the motor to operate in a corresponding mode of the operating modes; and applying the driving current to the motor.
    Type: Application
    Filed: May 9, 2006
    Publication date: November 16, 2006
    Inventors: Ferenc Fekete, Ming Au, Celement Chiu Sing Tse, Kenny Chi Ken Lee, Chi Keung Tang, Man Keung Mak, Ming Lam Ng, Kwok Kit Mak, Nai Lap Lee