Electricity: motive power systems – Positional servo systems – With compensating features
Reexamination Certificate
2006-03-21
2006-03-21
Martin, David (Department: 2837)
Electricity: motive power systems
Positional servo systems
With compensating features
C318S560000, C318S614000, C318S615000, C318S626000, C318S632000, C318S493000, C318S494000, C318S495000
Reexamination Certificate
active
07015670
ABSTRACT:
The invention provides a method for controlling an electromechanical servomechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A,32B or32C) adapted to be supplied with current and having a rotor (33) with an output shaft (35); a mechanical transmission (36) arranged between the output shaft and the load, the transmission having a mechanical friction related to the load; a servoamplifier (30) arranged to supply current to the motor coil in response to an input signal (in line29); a command signal (in line21) for commanding the position of the load; a load position feedback signal (in line23) compared (in summing point22) to the command signal and arranged to produce an error signal (in line24); and means (28) for generating an offset signal (in line26) that is summed (in summing point25) with the error signal to modify the servoamplifier input signal (in line29). The improved method comprises the steps of: generating the offset signal as a function of the command and feedback signals and the currents supplied to the motor coil after the position of the output member as remained substantially constant for a predetermined time; and adjusting the offset signal so that the motor current is reduced until the position of the output member changes so as to minimize the steady-state power dissipation in the motor.
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Hiruy Elias B.
Martin David
Moog Inc.
Phillips Lytle LLP
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