Servovalve Mechanical Feedback for Sensorless Position Control

The patent replaces electronic position feedback systems with a mechanical feedback rod that directly couples the power-directing member to the pilot stage. This mechanical coupling provides position feedback through pure mechanical means, eliminating movement sensors and power electronics while maintaining position control capability. The feedback rod transmits positional information mechanically from the power stage back to the pilot stage, resolving the contradiction between measurement precision and reliability.

The patent substitutes complex electronic position feedback components with a simple mechanical feedback rod. This rod provides direct mechanical coupling between the power-directing member and the pilot stage, transmitting position information without requiring sensors, signal processing electronics, or complex control circuits. The mechanical system achieves position control capability while dramatically reducing device complexity.

The patent replaces expensive power electronics and movement sensors with an inexpensive mechanical feedback rod. This rod can be manufactured from simple materials and requires no electronic components, signal processing circuits, or sophisticated control systems. The mechanical feedback system achieves position control capability at a fraction of the cost of electronic systems.