New low-profile closed-loop piezo linear stages

A maximum push/pull force of 7N and high acceleration rate of 20 'g' enable fast start/stop cycles to be achieved and high-speed scanning applications to be implemented. For time-sensitive applications, the maximum speed of 400mm/s will be a major benefit. Crossed-roller bearings mounted on precision ground aluminium profiles help to ensure high accuracy, and a direct metrology linear encoder enables a resolution of 0.1um to be achieved.

Other useful features include self-locking when the units are powered down, and no servo dither in the steady-state condition. Furthermore, in steady-state, there is no power consumption and no heat generation.

Typical applications include automation, medical devices, analytical equipment, bio-technology, nanotechnology, and test and measurement equipment.

The ultrasonic piezo linear motor drive is based on an ultra-compact standing-wave PZT ceramic element. At the heart of the system is a rectangular monolithic piezoceramic plate (the stator), segmented on one side by two electrodes. Depending on the desired direction of motion, the left or right electrode of the piezoceramic plate is excited to produce high-frequency eigenmode oscillations of tens to hundreds of kilohertz. An alumina friction tip (pusher) attached to the plate moves along an inclined linear path at the eigenmode frequency.

For optimum performance, PI offers its highly specialized C-886 motion controller, which also integrates the drive electronics. A number of special features, including dynamic parameter switching for an optimised high-speed motion and settling behaviour, take into account the motion characteristics typical of piezomotors. The broad-band encoder input (35MHz) supports the high accelerations and velocities intrinsic to the PILine piezo motors.

More information and datasheets are available on the PI website at www.physikinstrumente.com/en/news/fullnews.php?newsid=128&NR.