Functional models & prototypes of SMA actuators
We distinguish between prototypes in the intended target size and functional models at an enlarged scale. Prototypes of miniaturized shape memory actuators are often very small - too small to measure relevant intermediate variables (e.g. wire forces) or to incorporate adjustment options. Functional prototypes realized at a larger scale are much better suited to verify the functionality of new actuator concepts - especially since forces and motions can be easily scaled.
The following sections show examples of some prototypes and functional models that have recently been developed in our laboratory. Further actuator developments are currently underway.
Optical image stabilization for smartphone cameras
Prototype shape memory actuator with two tilt degrees of freedom
- Miniaturized design (8 x 8 x 5 mm³)
- Monolithic structure produced by injection molding
- 'Sensorless' control based on electrical resistance
- Feed forward control for tracking without delay up to 6 Hz
- Cooperation with industrial partner Actuator Solutions GmbH
(German Innovation Award 2014)
Gravity compensation for magnetic levitation drives
Prototype linear antagonistic shape memory actuator
- Magnetically non-conductive
- High positioning forces (±10 N)
- Positioning of a stroke element (±0,45mm)
- Compact design (17 x 23 x 6 mm³)
- Cooperation with the University of Stuttgart (IKFF)
Optical zoom for smartphones
Functional model (4:1) of a self-locking zoom actuator
- Small target size (9 x 18 x 4 mm³ )
- Large movement stroke (1 mm at target size )
- Power-off holding of the position by interlocking
- Interlocking without additional actuators
- Cooperation with industrial partner Actuator Solutions GmbH