학술논문
Duo-bimorph actuator made of PMN-PT [011]: 3D modeling, development and characterization
Document Type
Conference
Author
Source
2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics Advanced Intelligent Mechatronics (AIM), 2013 IEEE/ASME International Conference on. :140-145 Jul, 2013
Subject
Language
ISSN
2159-6247
2159-6255
2159-6255
Abstract
This paper reports the development of a duo-bimorph cantilevered actuator made of PMN-PT material and intended for large-stroke micro-scale manipulation. The principle of operation is piezoelectric, but with a series of material-induced particularities: PMN-PT is reputed for its very high piezoelectric and electromechanical coupling characteristics, but exhibits a lower coercive field which prevents driving in a fully bipolar manner. Instead of the uniaxial [001] plate, by using the anisotropic [011] cut, a positive transverse d 31 piezoelectric coefficient may be exploited. This allows the extension of the structure with the applied voltage, which is particularly beneficial for micro-gripping. After an introductory part in piezo-materials and duo-bimorph structures, a comprehensive static three-dimensional displacement modeling is provided by means of constitutive matrix equations. The actuator micro-manufacturing is presented, followed by the experimental characterization. Compared to the classical PZT structures, the actuation is increased by a factor of two, up to 600 µm in the transversal plane and up to 20 µm longitudinally. Some perspectives related to 3 DoF (Degrees of Freedom) micro-manipulation tasks are finally approached.