- Conference Article
- 10.1115/smasis2025-167646
Compact Rotary Actuator Based on Shape Memory Alloy Wire Bundles and Textile-Based Deflection Mechanism
- Sep 08, 2025
- Philipp Göddel + 4 more +4
Abstract This paper presents a compact rotary actuator based on SMA wire bundles and a textile-based deflection mechanism. Due to their flexible shape, high energy density and low cost, SMA’s, especially wires, represent a promising alternative for the realization of compact, lightweight and quiet actuator systems. The designed mechanism is based on a shaft with a diameter of 1 mm, to which a textile-based deflection component is attached. Electrical activation of SMA wire bundles glued to the textile causes the wires to contract, resulting in shaft rotation. The system is designed so that a linear SMA wire displacement of approx. 1 mm results in a rotational movement of 100°. An antagonistic arrangement of the wire bundles enables bi-directional rotational adjustment in a maximum compact design. Using SMA wire bundles made of six wires with a diameter of 150 μm results in peak torques of approx. 12 Nmm. An angular sensor is used to control the actuator displacement. The actuators can be used in any applications that requires limited rotary motion, such as valves controlling fluid or gas flow. Applications range from HVAC to automotive, aviation and aerospace.
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