A Monolithic Compliant Piezoelectric-Driven Microgripper: Design, Modeling, and Testing

In this paper, we report on the design, modeling, and experimental testing of a piezoelectric-driven microgripper making use of both an integrated gripping force sensor and an integrated tip displacement sensor. In the developed microgripper, a stack piezoelectric ceramic actuator is used to simulta...

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Bibliographic Details
Published in:IEEE/ASME transactions on mechatronics 2013-02, Vol.18 (1), p.138-147
Main Authors: Wang, D. H., Yang, Q., Dong, H. M.
Format: Article
Language:English
Subjects:
Actuators
Couplings
Design engineering
Displacement
Dynamic models
Fasteners
Flexure hinge
Force
Force sensors
Grippers
gripping force sensor
Mechatronics
Microassembly
microgripper
monolithic compliant mechanism
Optical fibers
Piezoelectric ceramics
Pneumatics
Robots
Sensors
stack piezoelectric ceramic actuator
Stacks
Strain
tip displacement sensor
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Summary:In this paper, we report on the design, modeling, and experimental testing of a piezoelectric-driven microgripper making use of both an integrated gripping force sensor and an integrated tip displacement sensor. In the developed microgripper, a stack piezoelectric ceramic actuator is used to simultaneously obtain the tip displacement and the gripping force. A novel monolithic compliant mechanism is proposed to act as the microdisplacement transmission mechanism to obtain the large tip displacement and to provide the possibility of integrating both the gripping force sensor and the tip displacement sensor into the microgripper. The relationship between the gripping force, tip displacement, input force, and input displacement of the piezoelectric-driven microgripper and the dynamic model are established using the pseudorigid-body-model method. The characteristics of the developed microgripper are tested and the case of gripping an optical fiber is presented. The experimental results indicate that: 1) the theoretical model for the developed microgripper matched well with the measured results; 2) the integrated gripping force sensor and tip displacement sensor could accurately measure the gripping force and tip displacement; 3) the developed microgripper could achieve a displacement magnification of 16.0 × with respect to the stack piezoelectric ceramic actuator to realize the large tip displacement with high resolution but is also able to possess the parallel movement of its gripping jaws and the constant displacement magnification.
ISSN:1083-4435
1941-014X
DOI:10.1109/TMECH.2011.2163200