New SMA Actuator with High Energy Efficiency and Quick Response
- New SMA Actuator with High Energy Efficiency and Quick Response
- 지광구; 한준현; 박제민; 장우양
- SMA actuator; energy saving; quick response; unique bias spring
- Issue Date
- Materials science forum
- VOL 654-656, 2111-2113
- The main drawbacks of SMA actuators are a slow response and a waste of electric
power. The power should be continuously supplied for SMA elements to remain in the austenite
state until the actuator begins to move to the other position. The problems are more serious when
batteries and thick SMA elements are used. We develop a new SMA actuator which consumes
little energy and responds very quickly. The actuator consists of a specially designed bias spring
structure, and two SMA elements which exert the force in opposite direction to each other. The
bias spring, unlike a common spring which has one stable position, has two stable positions. A
SMA1, for instance, contracts on heating by electricity, the actuator takes one stable configuration.
No further power supply is necessary to maintain the stable position, providing enough time for the
SMA1 to cool. When the other SMA2 is heated, it contracts with enough force to move the bias
spring and to expand the already-cooled SMA1. Power supply stops immediately after the actuator
takes the other stable configuration, causing power saving and quick response.
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- KIST Publication > Article
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