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Related Experiment Video

Updated: Sep 21, 2025

Fabrication of Soft Pneumatic Network Actuators with Oblique Chambers
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Wireless Micro Soft Actuator without Payloads Using 3D Helical Coils.

Seonghyeon Lee1, Woojun Jung1, Kyungho Ko1

  • 1Department of Control and Instrumentation Engineering, Korea University, Sejong 30019, Korea.

Micromachines
|May 28, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces 3D helical micro coils for enhanced wireless power transfer in soft actuators. This innovation significantly improves actuator performance and enables battery-free wireless operation for micro soft robots.

Keywords:
3D helical inductorsliquid–gas phase changesmagnetic inductionsoft actuatorswireless actuators

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Area of Science:

  • Microfabrication
  • Robotics
  • Wireless Power Transfer

Background:

  • Traditional microfabrication limits 3D structures, hindering wireless power transfer.
  • 2D spiral inductors have limitations in magnetic flux linkage compared to 3D designs.

Purpose of the Study:

  • To develop 3D helical micro coils for enhanced wireless power transfer.
  • To demonstrate wireless actuation of a soft bellows-shaped actuator using 3D inductors.

Main Methods:

  • Fabrication of 3D helical inductors using a 3D printed soluble mold technique.
  • Integration of 3D inductors with a 3D heater for a bellows-shaped actuator.
  • Comparison of performance with 2D spiral inductors.

Main Results:

  • The 3D helical inductor achieved 176.1% higher temperature increase in the actuator compared to 2D spiral inductors.
  • Actuator stroke increased by up to 522% with the 3D helical inductor.
  • Successful wireless actuation of the soft actuator was demonstrated.

Conclusions:

  • 3D micro coils significantly enhance wireless power transfer efficiency.
  • This approach enables robust wireless actuation for soft robots without batteries.
  • 3D helical inductors represent a key advancement for micro soft robotics.