Large Stroke High Fidelity PZN-PT Single-Crystal "Stake" Actuator

Area of Science:

• Materials Science
• Mechanical Engineering
• Nanotechnology

Background:

• Piezoelectric actuators are crucial for precision engineering.
• Existing designs face limitations in strain, cost, and control.
• Developing novel actuator architectures is essential for advancing micro/nanopositioning systems.

Purpose of the Study:

• To introduce and demonstrate a new piezoelectric actuator design, the "Stake" actuator.
• To evaluate the performance characteristics of the Stake actuator, including displacement, blocking force, and strain.
• To compare the performance of the Stake actuator with existing state-of-the-art piezoelectric actuators.

Main Methods:

• Fabrication of a Stake actuator using four d32-mode PZN-5.5%PT single crystals in a square-pipe configuration.
• Integration of polycarbonate guides and aluminum pedestals for structural integrity.
• Characterization of displacement-voltage response, blocking force, resonance, and effects of load and temperature.

Main Results:

• The fabricated Stake actuator (9 mm × 9 mm × 28 mm) achieved a stroke of [Formula: see text] and a blocking force of 114 N.
• Demonstrated negligible hysteresis (<1%) and a large linear strain range (>0.13%) up to 0.75 kV/mm.
• Exhibited over 30% greater axial strain compared to comparable PZT stack actuators.

Conclusions:

• The hollow-structured Stake actuator offers optimized single crystal usage and reduced cost.
• Its performance, including large strain and moderate blocking force, makes it suitable for applications requiring simple open-loop control.
• The design presents a promising alternative for high-displacement piezoelectric actuation.