# Piezoelectric actuator
A piezoelectric actuator is a device that converts electrical energy into mechanical displacement, force, or movement through the inverse piezoelectric effect, in which an applied electric field produces strain in a piezoelectric material such as lead zirconate titanate (PZT).[1](https://doi.org/10.1007/s11465-023-0772-0) • [2](https://www.nec.com/en/global/techrep/journal/g06/n05/pdf/t060519.pdf?nid=gihoEN022) Compared with electromagnetic drives, piezoelectric actuators need no rotating mechanism, position to subnanometer level, respond on a microsecond scale, deliver output force typically of several kilonewtons, dissipate little power, and come as small solid bodies that are convenient to design into machines.[3](https://journals.sagepub.com/doi/10.5772/59099)
| Key fact | Detail |
|---|---|
| Operating principle | Inverse (converse) piezoelectric effect: an applied electric field induces mechanical strain in a piezoelectric crystal or ceramic[1](https://doi.org/10.1007/s11465-023-0772-0) • [4](https://www.aerotech.com/wp-content/uploads/2020/09/QF46Z.pdf) |
| Precision and speed | Subnanometer positioning resolution; response on the microsecond scale[3](https://journals.sagepub.com/doi/10.5772/59099) |
| Output force | Typically about several kilonewtons[3](https://journals.sagepub.com/doi/10.5772/59099) |
| Stack travel | Extension strain of around 0.1% of actuator length, giving travel ranges of 10 to 200 micrometers for typical ceramic lengths[5](https://technav.ieee.org/topic/nanopositioning/) |
| Dominant material | PZT-based ceramics occupy the largest share of the piezoelectric ceramics market; PZT d\(_{33}\) is about 600 pC/N[6](https://doi.org/10.1146/ANNUREV-MATSCI-070616-124023) • [7](https://bulletin.ceramics.org/article/from-discovery-to-design-evolution-of-piezoceramic-fabrication-methods-for-application-specific-performance/) |
| Main nonlinearity | Open-loop hysteresis error of 10–15% of full range, rising to 35% as input frequency increases[3](https://journals.sagepub.com/doi/10.5772/59099) |
| Applications | Atomic force microscopes, adaptive optics, machine tools, micromanipulators, micropumps, microvalves, synchrotron imaging systems[8](https://doi.org/10.1016%2Fj.ymssp.2020.106634) |
## Principle and materials
The inverse piezoelectric effect was derived from thermodynamic principles in 1881 by [Gabriel Lippmann](https://www.edgepedia.org/gabriel-lippmann).[4](https://www.aerotech.com/wp-content/uploads/2020/09/QF46Z.pdf) When an electric field is applied to a piezoelectric crystal, it creates mechanical stress in the structural lattice, which translates into movement at micrometer or nanometer scale.[3](https://journals.sagepub.com/doi/10.5772/59099)
**Material history.** Ferroelectric ceramics, the active materials of most modern actuators, originated in the early 1940s with the discovery that ferroelectricity explained the unusually high dielectric constant of ceramic barium titanate capacitors.[9](https://ceramics.onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1999.tb01840.x) By the 1950s, lead-based piezoelectric materials, typically lead zirconate titanate, became widely used because of their high piezoelectric coefficients, with a d\(_{33}\) of about 600 pC/N for PZT.[7](https://bulletin.ceramics.org/article/from-discovery-to-design-evolution-of-piezoceramic-fabrication-methods-for-application-specific-performance/) The discovery of PZT is attributed to Sawaguchi in 1953; it is a complete solid solution between the ferroelectric perovskite PbTiO\(_3\) and the antiferroelectric perovskite PbZrO\(_3\), and its large, relatively temperature-independent piezoelectric factors near the [morphotropic phase boundary](https://www.edgepedia.org/morphotropic-phase-boundary) (composition where two crystal phases meet, maximizing piezoelectric response) at x = 0.48 underpin its position.[6](https://doi.org/10.1146/ANNUREV-MATSCI-070616-124023) Later high-displacement actuator developments include Moonie and RAINBOW (reduced and internally biased oxide wafer) ceramics.[9](https://ceramics.onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1999.tb01840.x)
## Types and stroke extension
A single piezoelectric layer strains only a fraction of a percent, so a large part of actuator design is devoted to multiplying that motion. The development path runs from single-layer materials using the converse piezoelectric effect, to multilayer piezo-stack actuators, amplified actuators, non-resonant stepping actuators, and resonant ultrasonic actuators, each step aimed at expanding output displacement.[10](https://www.sciencedirect.com/science/article/pii/S0888327019300457)
**Stack actuators** are the direct form: multilayer ceramic stacks whose extension strain is around 0.1% of their length, translating to travel ranges of 10 to 200 micrometers for typical ceramic lengths.[5](https://technav.ieee.org/topic/nanopositioning/) Flexure mechanisms, which use elastic bending of thin solid elements rather than sliding contacts, amplify actuator displacement while eliminating the friction and backlash that would corrupt nanometer-level positioning.[5](https://technav.ieee.org/topic/nanopositioning/)
**Stepping actuators** trade speed for long stroke. By replacing the clamping mechanism, the [inchworm actuator](https://www.edgepedia.org/inchworm-actuator), seal actuator, and inertial actuator can transform into one another, and the clamping mechanisms are classified into intermittent and continuous types.[10](https://www.sciencedirect.com/science/article/pii/S0888327019300457) Resonant ultrasonic motors form the other long-stroke family, and piezoelectric ultrasonic motors are noted for fast response, compactness, and simple configuration.[11](https://arxiv.org/abs/2409.04006)
## Nonlinearity: hysteresis, creep, and vibration
The actuator's own dynamics limit its accuracy. Under open-loop voltage control, hysteresis produces an error of 10–15% of the full travel range, and with increasing input signal frequency the error can reach 35%.[3](https://journals.sagepub.com/doi/10.5772/59099) Creep is the slow drift of the output over time after a commanded move; it can be ignored in most cases involving short durations.[3](https://journals.sagepub.com/doi/10.5772/59099) • [12](https://mdpi-res.com/bookfiles/book/672/Piezoelectric_MEMS.pdf?v=1742004064) A badly damped system also produces undesirable vibration, and a step voltage input excites a resonant response lasting a few milliseconds before creep takes over.[3](https://journals.sagepub.com/doi/10.5772/59099) • [13](https://www.mdpi.com/2227-7080/11/6/155) [Hysteresis](https://www.edgepedia.org/hysteresis) has a greater impact on the actuator's nonlinearity than creep.[14](https://www.mdpi.com/2076-0825/12/12/442)
**Compensation.** Two broad strategies exist. The first changes how the actuator is driven: driving with a charge input instead of a voltage input minimizes hysteresis and creep to a large extent, and inserting a capacitor in series with a voltage-driven actuator substantially reduces both.[15](https://digital.library.adelaide.edu.au/items/18a9951f-e303-46e8-8b12-7d1a8a549d75) The second models and cancels the nonlinearity in control. Hysteresis models used for this purpose include the Prandtl-Ishlinskii and Bouc-Wen models; a review of compensation strategies inferred that the Prandtl-Ishlinskii hysteresis model can provide better performance, that feedback control reduces hysteresis nonlinearity, and that fuzzy logic control can minimize low-amplitude vibration.[13](https://www.mdpi.com/2227-7080/11/6/155) • [8](https://doi.org/10.1016%2Fj.ymssp.2020.106634) In nanopositioning systems, when feedforward compensation grounded in Preisach or Bouc-Wen hysteresis models is paired with integral feedback control, the residual error over the entire range of travel shrinks to just a few nanometers.[5](https://technav.ieee.org/topic/nanopositioning/) No single generalized control solution suits all piezoelectric actuators; appropriate strategies must be matched to the actuator to reduce tracking error, position error, and the nonlinear characteristics.[8](https://doi.org/10.1016%2Fj.ymssp.2020.106634)
## Applications
Piezoelectric actuators realize high-precision motion with fractional force and torque in both linear and rotary joints of micro-systems.[8](https://doi.org/10.1016%2Fj.ymssp.2020.106634) Documented uses include atomic force microscopes, adaptive optics, machine tools, aviation systems, internal combustion engines, micromanipulators, and synchrotron-based imaging systems,[8](https://doi.org/10.1016%2Fj.ymssp.2020.106634) as well as autofocus mechanisms, lenses, micro pumps, micro valves, micro jet dispensers, tool feed mechanisms, and vibration isolation systems.[8](https://doi.org/10.1016%2Fj.ymssp.2020.106634) • [13](https://www.mdpi.com/2227-7080/11/6/155) In nanopositioning, the systems combine a compliant mechanical structure with an actuator and a position sensor inside a feedback control loop, and PZT is the dominant material because its coupling coefficient and stiffness match the requirements of semiconductor lithography, scanning microscopy, and optical alignment.[5](https://technav.ieee.org/topic/nanopositioning/) Because they are immune to electromagnetic interference, piezoelectric ultrasonic motors can operate inside MRI scanners, where conventional electromagnetic motors are problematic.[11](https://arxiv.org/abs/2409.04006)
## Materials trends
Conventional PZT contains over 60 wt% toxic lead oxide, and ecological concern has driven global regulatory mandates for lead-free alternatives.[16](https://www.nature.com/articles/s41467-026-72278-y) Potassium-sodium-niobate (KNN)-based ceramics are among the most researched lead-free candidates, but their drawback is reduced responsiveness and a limited temperature range over which high d\(_{33}\) is maintained.[16](https://www.nature.com/articles/s41467-026-72278-y) • [17](https://arxiv.org/abs/2502.20250) A 2026 multilayer co-fired KNN architecture raised the effective d\(_{33}\) from 165 pC/N in bulk ceramics to 1568 pC/N and cut the variation of piezoelectric response from room temperature to 120 °C from 36% to 9%, by using residual thermal stresses from the internal electrodes to stabilize the lower-symmetry phases and restrain domain switching.[16](https://www.nature.com/articles/s41467-026-72278-y) Research on lead-free materials also targets flexible and biocompatible formats, such as bismuth sodium titanate (BNT) and polymer composites, for biomedical and wearable electronics.[18](https://www.sciencedirect.com/science/article/pii/S2542504825000156)
## References
1. [Zhou X, Wu S, Wang X, et al. (2024). Review on piezoelectric actuators: materials, classifications, applications, and recent trends. Frontiers of Mechanical Engineering 19:6.](https://doi.org/10.1007/s11465-023-0772-0)
2. [NEC Technical Review: Piezoelectric actuators and the inverse piezoelectric effect.](https://www.nec.com/en/global/techrep/journal/g06/n05/pdf/t060519.pdf?nid=gihoEN022)
3. [Chi Z, Xu Q (2014). Recent Advances in the Control of Piezoelectric Actuators.](https://journals.sagepub.com/doi/10.5772/59099)
4. [Aerotech QF46Z Piezo Engineering Tutorial.](https://www.aerotech.com/wp-content/uploads/2020/09/QF46Z.pdf)
5. [IEEE Technology Navigator: Nanopositioning.](https://technav.ieee.org/topic/nanopositioning/)
6. [High-Performance Piezoelectric Crystals, Ceramics, and Films. Annual Review of Materials Research.](https://doi.org/10.1146/ANNUREV-MATSCI-070616-124023)
7. [From discovery to design: Evolution of piezoceramic fabrication methods. American Ceramic Society Bulletin.](https://bulletin.ceramics.org/article/from-discovery-to-design-evolution-of-piezoceramic-fabrication-methods-for-application-specific-performance/)
8. [Sabarianand DV, Karthikeyan P, Muthuramalingam T (2020). A review on control strategies for compensation of hysteresis and creep on piezoelectric actuators based micro systems. Mechanical Systems and Signal Processing 140:106634.](https://doi.org/10.1016%2Fj.ymssp.2020.106634)
9. [Haertling GH (1999). Ferroelectric Ceramics: History and Technology. Journal of the American Ceramic Society 82(4):797-818.](https://ceramics.onlinelibrary.wiley.com/doi/10.1111/j.1151-2916.1999.tb01840.x)
10. [Wang S, Rong W, Wang L, Xie H, Sun L, Mills JK (2019). A survey of piezoelectric actuators with long working stroke in recent years. Mechanical Systems and Signal Processing 123:591-605.](https://www.sciencedirect.com/science/article/pii/S0888327019300457)
11. [Design and Characterization of MRI-compatible Plastic Ultrasonic Motor. arXiv:2409.04006.](https://arxiv.org/abs/2409.04006)
12. [Piezoelectric MEMS (MDPI book chapter on hysteresis and creep).](https://mdpi-res.com/bookfiles/book/672/Piezoelectric_MEMS.pdf?v=1742004064)
13. [Application of Modeling and Control Approaches of Piezoelectric Actuators: A Review. Technologies 11(6):155 (2023).](https://www.mdpi.com/2227-7080/11/6/155)
14. [Review on the Nonlinear Modeling of Hysteresis in Piezoelectric Ceramic Actuators. Actuators 12(12):442 (2023).](https://www.mdpi.com/2076-0825/12/12/442)
15. [Minase J, Lu T-F, Cazzolato B, Grainger S (2010). A review of voltage, charge and capacitor insertion methods for driving piezoelectric actuators. Precision Engineering 34(4):692-700.](https://digital.library.adelaide.edu.au/items/18a9951f-e303-46e8-8b12-7d1a8a549d75)
16. [Dong Y, Ding Y, Zhang Y, et al. (2026). Multilayer-induced stress manipulation for superior piezoelectric performance and temperature stability in lead-free piezoceramics. Nature Communications 17:5770.](https://www.nature.com/articles/s41467-026-72278-y)
17. [Akshayveer A, Buroni FC, Melnik R, Rodriguez-Tembleque L, Saez A (2025). Environment-friendly technologies with lead-free piezoelectric materials. arXiv:2502.20250.](https://arxiv.org/abs/2502.20250)
18. [Advances in lead-free flexible piezoelectric materials for energy and evolving applications. Advanced Industrial and Engineering Polymer Research 8(3):341-386 (2025).](https://www.sciencedirect.com/science/article/pii/S2542504825000156)
---
*Topic: Encyclopedia › Technology and the built world › Engineering and manufacturing › Robotics and automation › Robot components and hardware › Actuators and artificial muscles*
*Initially written Oct 15, 2026*
*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*
License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license