EPFL · Science

Researchers Develop Thread-Like Motor

EPFL engineers have created a flexible, thread-like motor capable of generating linear motion, potentially revolutionizing soft robotics and wearable devices.

The new device, called FiberMotor, is only a few millimeters thick and consists of two nested hollow fibers wrapped with fine electrodes. Applying a voltage causes electrostatic forces that make the inner fiber slide within the outer one, producing linear movement.

Unlike conventional motors that require bulky components, FiberMotor offers silent, flexible, and bidirectional motion. Its movement range is limited only by the fiber length, and it is backdriveable, allowing for more natural interaction with human movements.

In lab tests, a single FiberMotor could support about 75 grams. Bundled together, four motors could lift a 46-gram chocolate bar or flex a robotic finger.

The researchers integrated the FiberMotor into a prototype knee garment, envisioning its distribution throughout smart textiles for distributed force application.

Future work aims to improve the FiberMotor's performance and durability using thinner electrodes and optimized materials.

Potential applications include soft exosuits for mobility assistance, wearable haptic systems for virtual reality, and lightweight prosthetics.

A startup, Elecsyor, has been founded to commercialize the technology, with research focusing on integrating feedback data for adaptive function.

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