New from piezo systems specialist PI is the novel N-380 / N-381 NEXACT ceramic linear motor actuator. Based on the Piezo Walk principle, this actuator and replaces classical lead screw actuators, combining high forces and long travel ranges with sub-nanometer resolution in a small package. Non-magnetic and vacuum compatible versions are available.
NEXACT actuators provide piezo-class resolution (far below one nanometer) and millisecond responsiveness. In contrast to conventional piezo actuators, the new stepping technology allows virtually unlimited travel ranges while retaining the high stiffness, in a very small package. The special drive design reduces the operating voltage to 40 V or less, with minimal power consumption.
In contrast to DC servo or stepper motor actuators, the piezo walk drive effects linear motion directly, without the need to transform rotation with gears and leadscrews. Backlash and wear are eliminated and the drive is maintenance-free. NEXACT actuators exhibit high stiffness and are self-locking when powered down with nanometer position stability, and zero heat dissipation or servo-dither at rest.
In operation, piezoceramic bending elements act on the ceramic runner, connected to the moving tip of the actuator. For long distance motion, the stepping mode is used. For smaller distances and for ultra-high dynamic motion, the analog (sweep) mode can be employed.
The actuator can be controlled through USB, RS-232 as well as with a joystick. The controller comes with a variety of software drivers and programming examples.
Typical applications for the actuator include micromanipulation and nanomanipulation, nanotechnology, microscopy and optics, nano-imprint, laser tuning, semiconductor test and production equipment, bio-technology, and medical technology.