Patents Assigned to H.R. Textron, Inc.
  • State advance controller commutation loop for brushless D.C. motors
    Patent number: 6239564
    Abstract: A method and system for advancing the state of commutation of an electronically commutated brushless D.C. motor. Impending motor stall is detected by measuring current flow through the motor windings to ascertain magnetic saturation. Upon such detection, a time sequence is started and if a change of state has not occurred within the time sequence, the state is advanced to the next succeeding state.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: May 29, 2001
    Assignee: H.R. Textron, Inc.
    Inventors: Ronald S. Boe, Robert W. Deller, Robert C. Heagey
  • Motor/spool interface for direct drive servovalve
    Patent number: 6000678
    Abstract: A direct drive servo valve including a motor having a shaft terminating in an engagement member. The engagement member is received within an opening defined by an engineering plastic material which is coupled to a valve member. The valve member is caused to reciprocate by rotation of the shaft of the motor to control the flow of fluid underpressure from a source thereof to output ports which are in turned coupled to a load.
    Type: Grant
    Filed: October 12, 1998
    Date of Patent: December 14, 1999
    Assignee: H.R. Textron Inc.
    Inventor: Kim Coakley
  • Demodulator circuit for use with a displacement sensor to provide position information
    Patent number: 5717331
    Abstract: To allow a displacement sensor to operate independently of changes in the excitation signal to the transducer, a demodulating circuit utilizing a single integrator is provided wherein comparison is made between the excitation signal and a reference signal, the comparison is used to adjust an output generating circuit which generates the output from the transducer. Advantageously, the output generating circuit can provide movement information from output of the transducer which include position, velocity and acceleration.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: February 10, 1998
    Assignee: H.R. Textron, Inc.
    Inventors: Robert W. Deller, Robert Heagey
  • Demodulator circuit for determining position, velocity and acceleration of displacement sensor independent of frequency or amplitude changes in sensor excitation signal
    Patent number: 5661397
    Abstract: To allow a displacement sensor to operate independently of changes in the excitation signal to the transducer, a demodulating circuit is provided wherein comparison is made between the excitation signal and a reference signal, the comparison is used to adjust an output generating circuit which generates the output from the transducer. Advantageously, the output generating circuit can provide movement information from output of the transducer which include position, velocity and acceleration.
    Type: Grant
    Filed: September 22, 1995
    Date of Patent: August 26, 1997
    Assignee: H. R. Textron Inc.
    Inventors: Robert W. Deller, Robert C. Heagey