Patent ID: 7246489

Claim:
A position control actuator system comprising: a control element; first and second actuators each comprising magneto-active twinned material; the first actuator configured to extend and drive said control element in a first direction when said first actuator is subjected to a magnetic field; the second actuator configured to extend and drive said control element in a second direction when said second actuator is subjected to a magnetic field; and a magnetic field source subsystem configured to: extend the first actuator to drive the control element in the first direction, and extend the second actuator to drive the control element in the second direction; and a processor configured to determine the position of the control element based on inductance of one of said actuators, in which said processor applies a voltage input step signal to at least one magnetic field source in said magnetic field subsystem and measures electrical current time response of said at least one magnetic field source to determine said inductance.