Shape memory alloy actuator has rotary axis for rotary drive element and two driven elements with shape memory alloy wires to produce torque around axis

摘要

The shape memory alloy actuator (1) has a rotary axis (4) for a rotary drive element (2) and two driven elements (6a,b) including tension wires formed of the shape memory alloy. The two tension wires contract to produce a torque in opposite directions (14a,b) around the rotary axis. The two wires can be positioned in parallel and the produced force have the same directions (8a,b). The driven elements can be spring biased against the operating directions of the wires.