The 8322NF Picomotor Piezo Linear Actuator is an ideal device for motorizing fine-positioning stages and mounts in your optical or mechanical systems. Use it with our optomechanical translation stages or your own custom devices. It has better than 30 nm resolution with minimal backlash over a 1 inch (25.4 mm) travel range, and can exert a 5 lb. (22-N) force. The M12 x 0.5mm threading of the Model 8322 lets it fit into metric micrometer mounting holes.
Picomotor actuators rely on the basic difference between dynamic and static friction. An example of this is the magician's "tablecloth trick," in which a quick pull (low dynamic friction) of the cloth leaves the dishes on the table, while a slow pull (high static friction) would pull the dishes off the table and cause a big mess! Our Picomotor actuator uses the same principle with a threaded jaw, similar to two halves of a split nut, clamped around a precision 80-pitch screw. One jaw is connected to one end of a piezoelectric transducer, and the other jaw is connected to the other end of the transducer. A slow electrical signal applied to the piezo slowly changes the length, causing the two jaws to slide in opposite directions. This slow sliding motion makes the screw turn (static friction). At the end of the transducer motion, a fast electrical signal quickly returns the jaws to their starting positions. Because of the screw’s inertia and low dynamic friction, it remains motionless, holding its position. Simply reversing the order of the fast and slow signals reverses the direction of rotation.
Our Picomotor actuators have a step size of less than 30 nm per step, allowing for very small, controlled movements. Note that the step size for open-loop picomotors varies from step to step and between forward and backward directions, and is directly related to payload – hence, position feedback should be provided by an external signal when operating an open-loop picomotor. For applications requiring absolute position calibration and high repeatability, consider a Closed-Loop Picomotor actuator.
With load capacity of 5 lbs (22 N), our Picomotor actuators have a substantial push force while still fitting in a compact package.
The standard sized mounting options, 0.375" shank or M12 x 0.5 mm thread, of the Picomotor actuators allow them easily be integrated into standard micrometer mounting holes.
Our Open-Loop Picomotor controllers and drivers are modular. You can daisy-chain up to 31 drivers together with four channels each, so you can have a network of up to 124 standard Picomotor actuators. You have two interface options with the controller system: hand pad or computer, both providing plug-and-play use. Alternatively, you may choose to use our TTL/Analog Picomotor driver.
The Picomotor actuator moves when voltage is applied to the piezo, changing its length and in turn moving the jaws which turn the screw. When no power is applied, the actuator does not move. You can feel confident that your set-up will stay put, even when you power down your system.
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