Patents by Inventor Jerry Murphree

Jerry Murphree 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).

  • Torque controller in an electric motor
    Publication number: 20070001636
    Abstract: The torque of a motor operated by an inverter circuit is controlled to allow maximum torque in the motor when the motor is stalled or at low rotation speeds. Control is accomplished by providing a switching frequency to the motor at a first switching frequency, detecting a rotation speed of the motor, and switching the current to the motor to a second switching frequency when the rotation speed of the motor drops to a predetermined slow rotation speed. The second switching frequency is less than the first switching frequency.
    Type: Application
    Filed: May 31, 2006
    Publication date: January 4, 2007
    Inventor: Jerry Murphree