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Rotary Piezo Motor for High Precision Positioning0 pages
CEDRAT
GROUPE
www.cedrat.com
Rotary Piezo Motor for
High Precision Positioning
Description
The Rotary Piezo Motor for High Precision Positioning (RPMHPP) is a Quasi-static (stepping)
Rotary Piezoelectric Motor that displays the known advantages of a piezo motor (e.g. a standstill
torque at rest of 0.6N.m without any power supply, a high positioning accuracy in the range
of 100 nrad ...). The RPMHPP principle is patented by CEDRAT TECHNOLOGIES and has been
developed and space evaluated in the frame of an ESA TRP contract.
The RPA uses ultrasonic vibrations to move the rotor through frictional forces. The friction material
is bonded onto the rotor and displays a low wear rate, a high friction coefficient similar in the air
and in vacuum): a polymer solution, already known and experienced by CEDRAT TECHNOLOGIES
onto the Linear Piezo Motor is used. This motor is issued from a TRP program from ESTEC.
Space evaluation program
The RPMHPP followed a space evaluation program
including
• Functional tests,
• Lifetime test (100 hours),
• Random vibration (20 Grms),
• Thermal vacuum test (-25 / 85 °C),
• Lifetime test (500.000 strokes).
For more information, please contact:
CEDRAT TECHNOLOGIES
15 Chemin de Malacher - Inovallée
38246 Meylan Cedex - France
actuator@cedrat.com
Phone: +33 (0)4 76 90 50 45 - Fax: +33 (0)4 56 38 08 30
Copyright © CEDRAT Group Sept. 2008
RPMHPP motor.
RPMHPP motor - Schematic
view.
