Patent ID: 8672291
Filing Date: 2014-03-18
Classification: F16K,H01F

Abstract:
1. An actuator control system including a servo-actuator comprising: a solenoid comprising: a servo valve adjacent to the solenoid, comprising: a moveable member adjacent to the servo valve, on an opposite end of the servo valve from the solenoid; a non-contact sensor integral with the servo-actuator, positioned adjacent to the solenoid on an opposite end of the solenoid from the servo valve; a feedback spring exerting a bias force biasing the spool and movable armature in a first direction, coupled on a first end to the spool and on a second end to the movable member, such that movement of the movable member alters the bias force of the feedback spring; a null spring coupled to the movable armature, biasing the spool and the movable armature in a second direction opposite the first direction; and a sensor rod having a first end adjacent to the non-contact sensor, a second end coupled to the movable member, and a length extending between the first end and the second end, passing through the solenoid, the spool, the feedback spring and the null spring; the first end of the sensor rod having a sensing core pin for sensing by the non-contact sensor, such that a position of the movable member is reported by the non-contact sensor by sensing a position of the sensing core pin.