Soft Electromagnetic Sliding Actuators for Highly Compliant Planar Motions Using Microfluidic Conductive Coil Array

Area of Science:

• Robotics
• Materials Science
• Electromagnetism

Background:

• Developing compliant actuation systems is crucial for advanced robotics.
• Existing actuators often face limitations in flexibility, power consumption, and multi-surface operation.
• Soft electromagnetic actuators offer potential for overcoming these challenges.

Purpose of the Study:

• To propose and characterize a novel soft electromagnetic sliding actuator.
• To enable versatile planar motions for highly compliant actuation systems.
• To demonstrate the actuator's capabilities in robotic applications.

Main Methods:

• Designing a soft actuation base (stator) with a parallel liquid-metal coil array for maximized electromagnetic field density.
• Utilizing stretchable magnetic components for stable slider positioning without external constraints.
• Implementing an untethered structure for reduced power consumption and programmable trajectory control.
• Employing inductance change measurements for slider position estimation.

Main Results:

• The actuator achieves stable planar motion with programmable trajectories.
• It demonstrates reduced power consumption due to an untethered design.
• The actuator successfully operates on curved and inclined surfaces.
• Position estimation is achieved through inductance change measurements.

Conclusions:

• The proposed soft electromagnetic sliding actuator offers a unique solution for compliant actuation.
• Its design enables versatile motion control, reduced power usage, and adaptability to various surfaces.
• The actuator shows promise for advanced robotic applications like shape morphing and integrated sensing.