Impact drive rotary precision actuator with piezoelectric bimorphs

Abstract

An impact drive rotary precision actuator with end-loaded piezoelectric cantilever bimorphs is proposed. According to finite element analysis and experiments of the dynamic characteristics of end-loaded piezoelectric cantilever bimorphs, a specific fixed-frequency and adjustable-amplitude is confirmed to control the actuator. The results show that an actuator excited by fixed-frequency and the adjustable-amplitude ramp voltage waveform works with a large travel range (180°), high resolution (1 ?rad), speed (0.2 rad/min) and heavy-load ability (0.02 Nm). With advantages of high-precision positioning ability, simple structure and only one percent the cost of traditional impact drive mechanisms, the actuator is expected to be widely used in precision industries.

References

1. Liu Y T Higuchi T Precision positioning deviceutilizing impact force of combined piezo-pneumatic actuatorAsmetransactions on Mechatronics6(4)467473
2. Hua S M Cheng G M The current research on thepiezoelectric actuator for precision displacementPiezoelectric and Acoustooptics 2004 26(3)192195
3. Sun L N LIU P K Status and development of in-pipemicro robotsOptics and Precision Engineering 2003 11(4)326332
4. Wu T Paul I R Dynamic peak ampitude analysisand bonding layer effects of piezoelectric bimorph cantileverSmart Materials and Sructures13(1)203210
5. Morita T Yoshida R Three DOF parallel link mechanismutilizing smooth impact drive mechanismJournal of the International Societies for Precision Engeering andNanotechnology26(3)289295
6. Chi D X Yan G Z Inertia-friction based 4 DOFmicroactuator driven by PZTOptics and PrecisionEngineering 2001 9(2)135138