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Vacuum-gap electrostatic multilayer actuators for space robotics.

Ion-Dan Sîrbu1,2, Arianna Mazzotta3, Ubaldo Tosi1

  • 1Institute of Mechanical Intelligence, Scuola Superiore Sant'Anna, Pisa, Italy.

Nature Communications
|December 11, 2025
PubMed
Summary
This summary is machine-generated.

We developed novel electrostatic actuators that utilize vacuum for space robot operation. These lightweight, high-performance devices offer a reliable solution for space applications.

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Area of Science:

  • Materials Science
  • Robotics
  • Aerospace Engineering

Background:

  • Space robot actuation faces challenges in vacuum environments.
  • Conventional electromagnetic and electrostatic actuators have limitations like heat dissipation, lubrication issues, low reliability, and lack of space-compatible materials.

Purpose of the Study:

  • To introduce a new class of electrostatic actuators that leverage vacuum properties for space applications.
  • To overcome the limitations of existing actuation technologies in vacuum.

Main Methods:

  • Development of dielectric/conductive multilayer thin-film polymeric actuators enclosing vacuum gaps.
  • Utilizing the dielectric properties of vacuum as an enabling factor for actuation.
  • Demonstration of zipping-like motions and actuation through volume changes.

Main Results:

  • Demonstrated 0.7g actuators with millimeter-range strokes and forces over 4N.
  • Achieved a bandwidth greater than 100 Hz and peak power-to-mass ratios of 1.4 kW/kg.
  • Actuators are made from standard space polymers, enabling stackable, power-dense direct-drive actuation.

Conclusions:

  • The novel electrostatic actuators effectively utilize vacuum, turning a challenge into an advantage.
  • These actuators offer a promising, reliable, and power-dense solution for space applications.
  • The technology enables efficient direct-drive actuation in vacuum environments.