Design and experiment of a piezoelectric actuator based on inchworm working principle

[Display omitted] •An electromechanical coupling model is established, providing theoretical foundation for the type of actuators.•The actuator has advantages of simple structure and easy manufactured.•The power-off clamping is realized by the cooperation of lever-type amplification mechanism and el...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2020-05, Vol.306, p.111950, Article 111950
Main Authors: Dong, Hangjia, Li, Tuanjie, Wang, Zuowei, Ning, Yuming
Format: Article
Language:English
Subjects:
Ceramics
Clamping
Dynamic models
Dynamical model
Fractal theory
Friction
Inchworm actuator
Mathematical models
Piezoelectric actuators
Piezoelectric ceramics
Sensors
Stiffness
Studies
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Summary:[Display omitted] •An electromechanical coupling model is established, providing theoretical foundation for the type of actuators.•The actuator has advantages of simple structure and easy manufactured.•The power-off clamping is realized by the cooperation of lever-type amplification mechanism and elastic body. A piezoelectric ceramics (PZT) inchworm actuator is designed and tested in this work. The proposed actuator is mainly composed of a driving mechanism and two clamping mechanisms. The dynamical model of the actuator is established with considering the output nonlinearity of the PZT. The friction between the baffle and the clamping claw is calculated based on the fractal theory, and the slipping phenomenon is researched. The effects of the driving frequency, the voltage, and the stiffness of the flexible hinge on performances of the actuator are researched based on the dynamical model. The prototype is manufactured, and the experiment results verify the validity of the dynamical model and the designing scheme. The fabricated actuator achieves a maximum speed of 0.72 mm/s and a maximum displacement of 11 mm.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2020.111950