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
  • 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