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Thermoplastic linear actuator boasts 200mm travel range

Posted: 22 Oct 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Physik Instrumente? linear actuator? piezomotor? high-frequency oscillations?

Physik Instrumente recently unveiled the U-264KSPA linear actuator, a self-locking drive optimised for production in large quantities using engineering thermoplastics.

The U-264KSPA linear actuator features a 200mm travel range and a minimum incremental motion of 6?m. A linear encoder with 0.6?m resolution assures reliable position control and repeatable accuracy. With the drive technology of PILine ultrasonic piezo motors, velocities of up to 150mm/s and a maximum holding force of 6N can be achieved.

PILine linear drives dispense with the mechanical complexity of classical rotary motor/gear/leadscrew combinations in favour of costs and reliability. An integral part of the ultrasonic piezomotor is the piezo ceramics that is pretensioned against a movably guided runner via a coupling element. The piezo element is excited to high-frequency oscillations that cause the runner to move.

As piezomotors are self-locking at rest, no heat is generated and mechanical components such as brakes or gearhead can be dispensed with. As a result, the U-264KSPA ensures high positional stability. The stiff design, direct coupling and fast response times of the piezo ceramics allow for a highly dynamic start/stop behaviour.

Preloading the piezoceramic actuators against the runner ensures self-locking of the drive when at rest and powered down. As a result, it does not consume any power, does not heat up, and keeps the position mechanically stable.

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