Patents by Inventor Christopher Digby Roberts

Christopher Digby Roberts 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).

  • Electric motor control
    Patent number: 8847529
    Abstract: A control system for an electric motor comprises processing means arranged to perform a control process which includes monitoring electrical voltages applied to the motor and electrical currents in the motor, and determining from them the rotational position of the motor. The system is further arranged to monitor at least one parameter of the control process thereby to detect a stall condition of the motor.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: September 30, 2014
    Assignee: TRW Limited
    Inventors: Christopher David Dixon, Christopher Digby Roberts
  • ELECTRIC MOTOR CONTROL
    Publication number: 20100194325
    Abstract: A control system for an electric motor comprises processing means arranged to perform a control process which includes monitoring electrical voltages applied to the motor and electrical currents in the motor, and determining from them the rotational position of the motor. The system is further arranged to monitor at least one parameter of the control process thereby to detect a stall condition of the motor.
    Type: Application
    Filed: June 30, 2008
    Publication date: August 5, 2010
    Inventors: Christopher David Dixon, Christopher Digby Roberts