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Robotics Videos

How does a Piezo Ratchet Mechanism Work in a Closed-Loop Precision Actuator?

PI (Physik Instrumente) LP

Piezo Ratchet Motors are inertia motors based on the stick-slip effect. A small piezo ceramic actuator embedded in a precision mechanism drives a high resolution screw. An optical encoder reads position changes and feeds the information back to a closed-loop controller. Resolution in the nanometer rage is feasible, self-locking design with high holding forces compared to the compact size.


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