Rotary Piezo Motor for High Precision Positioning - CEDRAT TECHNOLOGIES - #1

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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.