Mechanical actuators based on shape memory alloys.
Applications include robotic probes, laparoscopic medical probes, and micro-lenses positioning.
Applications where space and weight are limited require alternatives to traditional actuators .
This invention proposes actuators that are based on Shape Memory Alloy (SMA) sheets and are built by combining a basic actuation unit. Depending on the combination of these cells the direction of actuation, the force generated and the expansion of the actuator can be controlled. This design reduces the power required and makes mounting the cell simple since the support points are not heated. The force to weight ratio is 160 for comparable power consumption to commercial electromagnetic motors.
- Lightweight and low power consumption
- High weight to force ration (~160)
- Focalizes heat to avoid structural damage
- Achieves long strokes, minimum of 57% expansion