Shape memory actuator
Shape memory actuator are devices that make use shape memory transformation. If the one dimension transformation of shape memory alloy is used than it called a linear actuator. A linear actuator is a mechanical device that converts energy (power from air, electricity or liquid) to create motion in a straight line. It can also be used to apply a force. Types of motion include: blocking, clamping, ejecting, lifting, descending, pushing or pulling.
The most important functional properties, which characterize shape memory wire for actuators, are the capability to recover high strain values, the characteristic transformation temperatures and the thermomechanical cycling stability. The aim of miniaturization is to develop actuators that yield high mechanical performance in a limited space; for this reason one peculiar requirement of miniaturized actuator elements is that it need be light and compact.
Shape Memory actuator components
A typical SMA actuator is generally made up of several parts:
The mechanical system.
The SMA element.
A bias element able to restore the deformed shape of SMA element.
An electrical control unit.
A set of fixtures used to couple the actuator with the mechanical system.
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SMA transformation temp.
SMA actuators adv. disadv.