EPFL fiber motor lifts load and flexes robotic finger in lab tests

EPFL researchers demonstrated a flexible fiber motor that can lift a load and flex a tendon-driven robotic finger in laboratory tests. Four motors bundled together lifted a 46-g chocolate bar, while individual motors supported stationary loads equivalent to about 75 g. Each FiberMotor measures 1 to 3 millimeters in diameter and contains two nested hollow polymer fibers wrapped with copper-wire electrodes. Electrical current creates electrostatic forces that slide the inner fiber within the outer one. Without gears or transmissions, the motor yields to an opposing external force instead of locking up. The researchers are working through spinoff Elecsyor to improve its durability and performance.