Abstract
A piezo-driven linear actuator based on the improved stick–slip principle is developed in this article. With the help of two piezo-stacks and flexure hinges, the preload force can be changed, so the designed actuator can realize relatively large linear ranges and large output force. The designed actuator mainly consists of the mover, the stator, two piezo-stacks, an adjusting stage and the base. The working principle and theoretical analysis are described. A prototype actuator was fabricated and a series of experiments were carried out to investigate the work characteristics of it. Experimental results indicate that the maximum speed is about 3.086 mm/s and the maximum output force is 0.98 N. They are both improved compared with the traditional stick–slip motion. Experimental results confirm that the proposed actuator can realize large output force relatively and different motion speeds with high accuracy under different driving voltages and frequencies.
Highlights
Piezo-driven actuators are widely used in the precision positioning system due to their advantages that they can provide rapid response with high resolution in compact sizes
They can be mainly classified into direct driving actuators, ultrasonic actuators, impact driving actuators, inchworm actuators, stick–slip actuators and so on
Right-circular flexure hinges and the bridge-type amplification mechanism are used for piezo-stack B to gather the preload force and the parasitic displacement in the working direction, which can improve the output force and the motion speed than the ones of traditional stick–slip actuators
Summary
Piezo-driven actuators are widely used in the precision positioning system due to their advantages that they can provide rapid response with high resolution in compact sizes. Direct driving actuators can reach rapid response motions with high resolution and the structures can be small and the output force can be large. Most of the designed stick–slip actuators are working under constant preload force, so the output force of stick–slip actuators is limited This article uses another piezo-stack and one flexure hinge mechanism to change the normal force between the stator and the mover, so that to improve the maximum output force. The output force can be enlarged using piezoelectric stacks A and B at the same time; this may bring more applications for the stick–slip actuators
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