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Design of symmetrical piezoelectric stick-slip actuators with dual PZT synergy and reverse displacement suppression
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DOI：10.1088/1361-665X/ae620a.png)
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Abstract
En 中文
To address reverse displacement during piezoelectric stick-slip actuators’ rapid retraction—seriously compromising positioning accuracy and smoothness—this paper proposes a symmetric actuator (S2P-SSA) with dual PZT synergistic drive and reverse displacement suppression. PZT1 provides horizontal driving force, while PZT2 actively increases normal pressure between moving and stationary parts during retraction for effective suppression. Integrated with a two-stage lever amplification unit and symmetrical structure, it enhances displacement output and bidirectional motion consistency. A reverse displacement suppression mechanical model and flexible hinge stiffness matrix model are established. Simulations confirm structural safety, and experiments on the 100 mm × 120 mm × 35 mm prototype show a flexible hinge amplification ratio of 2.74. At 35 V PZT2 voltage, minimum reverse displacements are 1.1017 μm (left) and −1.0819 μm (right) (suppression rate >87%). It delivers stable output at 1–100 Hz, a maximum no-load speed of 4.086 mm s−1 at 200 Hz, and stable operation at 2.015 μm s−1 under 150 g load, with bidirectional deviation <2% and excellent long-term stability. This study resolves excessive reverse displacement in traditional actuators, meeting high-precision demands in advanced manufacturing and providing novel design concepts.
Keywords:
piezoelectric actuator
reverse displacement suppression
dual PZT synergy
stick-slip mechanism
symmetric design
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