Bidirectional Drive with Inhibited Hysteresis for Piezoelectric Actuators

Area of Science:

• Mechanical Engineering
• Materials Science
• Nanotechnology

Background:

• Piezoelectric actuators are crucial for precision driving and positioning.
• Conventional actuators exhibit asymmetrical, non-linear displacement, causing significant errors and reduced accuracy.
• Hysteresis phenomenon in piezoelectric materials limits their performance.

Purpose of the Study:

• To propose and analyze a novel bidirectional active drive piezoelectric actuator.
• To suppress hysteresis and minimize non-linear errors in piezoelectric actuators.
• To enhance the positioning accuracy and driving performance.

Main Methods:

• Development of a theoretical model for a rhombus mechanism based on beam deformation theory.
• Analysis of key parameters influencing drive performance.
• Finite element method (FEM) analysis of static and dynamic characteristics.
• Prototyping and experimental testing of the actuator's output performance.

Main Results:

• The proposed actuator achieves bidirectional symmetric amplified displacement output.
• Maximum amplified displacement reached 91.45 μm with a resolution of 35 nm.
• Non-linear error was reduced by 62.94% compared to conventional piezoelectric stacks.

Conclusions:

• The bidirectional active drive piezoelectric actuator effectively suppresses hysteresis and reduces non-linear errors.
• The developed actuator demonstrates superior performance in terms of symmetric displacement and resolution.
• This technology offers significant improvements for precision driving and positioning applications.