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Updated: Dec 10, 2025

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
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Large-Displacement Vertical Electrostatic Microactuator Dynamics using Duty-Cycled Softening/Stiffening Parametric

H Li1, P Barnes2, E Harding2

  • 1University of Michigan Medical School, Ann Arbor MI.

Journal of Microelectromechanical Systems : a Joint IEEE and ASME Publication on Microstructures, Microactuators, Microsensors, and Microsystems
|September 1, 2020
PubMed
Summary

This study explores mixed softening/hardening dynamics in electrostatic microactuators to achieve large vertical scanning ranges for endoscopic microscopy. Results show significant displacement at high frequencies, validating the modeling approach.

Keywords:
Biomedical microscopyDynamicsElectrostatic devicesMicroactuators

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Area of Science:

  • MEMS technology
  • Nonlinear dynamics
  • Microactuator design

Background:

  • Electrostatic microactuators are crucial for miniaturized devices like endoscopic microscopes.
  • Achieving large vertical scanning ranges at high frequencies is a key challenge.
  • Parametric resonance has enabled recent advancements in microactuator performance.

Purpose of the Study:

  • To investigate the use of mixed softening/hardening dynamics in electrostatic microactuators.
  • To model and understand the behavior of these microactuators for enhanced motion.
  • To optimize actuator design for large displacement and high-frequency operation.

Main Methods:

  • Non-dimensional analysis of actuator motion.
  • Modeling of mixed softening/hardening nonlinear dynamics.
  • Experimental characterization of a sample actuator design.

Main Results:

  • Demonstrated large vertical scanning range of up to 480 μm.
  • Achieved high-frequency operation at 1225 Hz with 60 V.
  • Validated experimental results against predicted trends from the dynamic model.

Conclusions:

  • Mixed softening/hardening dynamics are effective for achieving large motion ranges in electrostatic microactuators.
  • The developed modeling approach provides valuable insights into actuator behavior.
  • This work contributes to the advancement of microactuators for endoscopic microscopy and other applications.