Development of a micro-gripper using piezoelectric bimorphs.

Area of Science:

• Robotics and Automation
• Materials Science
• Mechanical Engineering

Background:

• Piezoelectric bimorphs are utilized in micro-gripping systems.
• Existing systems can be complex with uncharacterized response performance.

Purpose of the Study:

• To theoretically and experimentally investigate the dynamic characteristics of bending piezoelectric bimorph actuators.
• To implement and evaluate a parallel micro-gripper for micro-object handling.

Main Methods:

• Dynamic characteristics (deflection, transient, frequency response) were analyzed under varying voltages and signals.
• A parallel micro-gripper with individually actuated cantilevered bimorphs was constructed.
• Non-contact proximity sensors measured bimorph tip deflection.

Main Results:

• Precise micro-manipulation capabilities were demonstrated.
• The micro-gripper successfully handled objects as small as 50 µm.
• Direct actuation by piezoelectric bimorphs eliminated the need for external extensions.

Conclusions:

• The study successfully characterized piezoelectric bimorph actuators for micro-gripping.
• The implemented parallel micro-gripper offers a simplified, lightweight, and effective solution for micro-object handling.
• This approach enhances precision and reduces system complexity in micro-manipulation tasks.