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A linear servoactuator including an integrated split-secondary differential transformer position sensor and a fluid driven linear actuator controlled by solenoid poppet valves. Signals from the position sensor transformer are digitized and linearized by a control microcomputer by using digitized tra

A linear servoactuator including an integrated split-secondary differential transformer position sensor and a fluid driven linear actuator controlled by solenoid poppet valves. Signals from the position sensor transformer are digitized and linearized by a control microcomputer by using digitized transformer signals as addresses for a programmable read only memory. The linearized output is compared to a command position to determine an error value. When the error reaches a predetermined magnitude, indicating that the actuator is approaching the command position, solenoid poppet valves are actuated by a pulse-width modulated signal from the microcomputer to progressively decrease the fluid flow to the actuator for deceleration.

대표청구항 ▼

An integrated servomechanism and position sensor apparatus, comprising: an actuator including a variably positionable magnetically permeable portion confined to move only within a predetermined space; a split secondary transformer having a primary coil and a pair of spaced-apart secondary coils; mea

An integrated servomechanism and position sensor apparatus, comprising: an actuator including a variably positionable magnetically permeable portion confined to move only within a predetermined space; a split secondary transformer having a primary coil and a pair of spaced-apart secondary coils; means for exciting said primary coil to produce a time-varying electromagnetic field within said predetermined space, movement of said magnetically permeable portion within said predetermined space coupling said electromagnetic field into said secondary coils; circuit means connected to said secondary coils for providing a coil signal which varies as a function of the position of said magnetically permeable portion of said actuator; means responsive to said coil signal for transforming said coil signal into an actual position signal which varies as function of the position of said actuator; command position signal means for providing a desired position signal corresponding to a desired position for said actuator; means for providing a driving signal as a function of the difference between said desired position signal and said actual position signal; and actuator moving means responsive to said driving signal for generating an actuator driving force within said predetermined space for causing said actuator to move toward said desired position.