Patents by Inventor Udaya K. Madawala

Udaya K. Madawala 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 and apparatus for starting an induction motor
    Patent number: 6903532
    Abstract: A starting circuit for an induction motor is provided whereby a stationary rotor flux is established then a stored charge supplied to a motor winding in order to provide a starting torque. Before applying a mains power supply to the motor after the starting torque has been applied, a back EMF is sensed, directly or indirectly, to provide an indication that the rotor is turning before the mains supply is connected to the motor. This provides a reliable and simple method for ensuring that a mains supply may be safely connected to the motor.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: June 7, 2005
    Assignee: Auckland Uniservices Limited
    Inventors: John T. Boys, Udaya K. Madawala
  • Safety start
    Publication number: 20040061473
    Abstract: A starting circuit for an induction motor is provided whereby a stationary rotor flux is established then a stored charge supplied to a motor winding in order to provide a starting torque. Before applying a mains power supply to the motor after the starting torque has been applied, a back EMF is sensed, directly or indirectly, to provide an indication that the rotor is turning before the mains supply is connected to the motor. This provides a reliable and simple method for ensuring that a mains supply may be safely connected to the motor.
    Type: Application
    Filed: November 13, 2003
    Publication date: April 1, 2004
    Inventors: John T Boys, Udaya K. Madawala