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A Three-Phase Electrostatic Clutch with Variable Mechanical Impedance Control for Soft Robotic Systems.

Dongyoung Lee1, Heejin Yu2, Joonbum Bae3

  • 1Electronics and Telecommunications Research Institute (ETRI), Daejeon, 34129, South Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 16, 2025
PubMed
Summary

This study introduces a novel three-phase electrostatic (ES) clutch for enhanced mechanical impedance control in soft actuators. The new design minimizes oscillations and force degradation, improving stability in soft robotic systems.

Keywords:
damping effect controlmechanical impedance controlphase modulation methodthree‐phase electrostatic clutch

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Area of Science:

  • Robotics
  • Mechanical Engineering
  • Materials Science

Background:

  • Soft actuators often exhibit nonlinearities causing oscillations, impacting stability and precision.
  • Conventional electrostatic (ES) clutches for mechanical impedance control suffer from residual charge and stick-slip issues, limiting reliability.

Purpose of the Study:

  • To introduce a three-phase ES clutch for variable mechanical impedance control.
  • To enable continuous friction modulation, reducing force degradation and oscillatory motion in soft actuators.

Main Methods:

  • Development of a novel three-phase electrostatic (ES) clutch.
  • Experimental validation using tensile tests.
  • Application in a vibration system to assess mechanical impedance control.

Main Results:

  • The proposed three-phase ES clutch demonstrated continuous friction modulation capabilities.
  • Reduced force degradation and oscillatory motion were observed compared to conventional designs.
  • Effective mechanical impedance control was validated in experimental setups.

Conclusions:

  • The three-phase ES clutch provides a robust and adaptable solution for friction modulation and mechanical impedance control.
  • This technology addresses key limitations of conventional ES clutches in soft robotic and wearable systems.
  • The findings support the use of this clutch for enhanced performance in soft robotics.