A new open-loop driving method of piezoelectric actuator for periodic reference inputs

Area of Science:

• Engineering
• Control Systems
• Materials Science

Background:

• Hysteresis in piezoelectric actuators limits precise tracking control.
• Accurate modeling of hysteresis is crucial for compensation.

Purpose of the Study:

• To propose a novel mathematical model for piezoelectric actuator hysteresis.
• To implement an open-loop controller using this model to compensate for hysteresis.
• To experimentally validate the controller's performance in precise tracking.

Main Methods:

• Development of a new mathematical model to characterize hysteresis.
• Implementation of an open-loop tracking controller based on the proposed model.
• Experimental validation using a micro-positioning stage for sinusoidal trajectory tracking.

Main Results:

• The proposed model accurately describes piezoelectric actuator hysteresis.
• The open-loop controller significantly improved positioning precision compared to uncompensated control.
• The feedforward control method demonstrated superior tracking performance over PID controllers.

Conclusions:

• The novel mathematical model and open-loop controller effectively compensate for piezoelectric actuator hysteresis.
• This approach enhances positioning precision in precise tracking applications.
• The method offers a competitive alternative to traditional closed-loop control strategies.