The latest news from academia, regulators
research labs and other things of interest
Posted: October 18, 2007
Piezo Linear Motors Move Family of Low Profile Linear Stages Fast and Precisely
(Nanowerk News) Piezo motor specialist PI (Physik Instrumente) L.P. offers a new family of ultrasonic piezo-motor-driven linear stages: Models M-663, M-664 and M-682 provide travel ranges to 50 mm in a very compact package.
Features and Advantages:
Easy Integration due to Very Small Footprint and Only 15 mm Profile Height
Vacuum Compatible & Non-Magnetic Versions
High Acceleration to 20 g for fast Start/Stop and High-Speed Scanning
Self-Locking when Powered Down, No Servo Dither in Steady State.
Fast: to 400 mm/s (16 inch/sec) for Time Sensitive Applications
No Heat Generation / Power Consumption in Steady State
High Accuracy Direct Metrology Linear Encoder, 0.1 µm Resolution
Crossed Roller Bearings for Improved Guiding Accuracy
Travel Ranges 20, 25 and 50 mm (0.8 to 2 inch)
Typical Applications: Automation, Medical Devices, Analytical Equipment, Bio-Technology, Nanotechnology, Test & Measurement Equipment
For improved guiding accuracy, crossed roller bearings are mounted on precision ground aluminum profiles. A direct metrology linear encoder with 0.1 µm resolution provides high linearity and positioning accuracy. The integrated ceramic linear motors can generate push/pull forces up to 7 N, at speeds to 400 mm/sec.
Ultrasonic Motors, How Do They Work?
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.
Optimized Controller and Drive Electronics
For optimum performance the highly specialized C-886 motion controller is available. This sophisticated controller also integrates the drive electronics. A number of special features, including dynamic parameter switching for an optimized high-speed motion and settling behavior, take into account the motion characteristics typical of piezomotors. The broad-band encoder input (35 MHz) supports the high accelerations and velocities intrinsic to the PILine® piezo motors.
PI is a leading manufacturer of piezo nanopositioning and precision motion-control equipment for photonics, nanotechnology, semiconductor and life science applications. PI has been developing and manufacturing standard & custom precision products with piezoelectric and electromagnetic drives for 35+ years. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. PI is present worldwide with eight subsidiaries and total staff of 450+.