Perspectives for Shape Memory Actuators

The properties of electrically activated shape memory actuators described so far have indicated that these actuators are well-suited to drive mechanical mechanisms. The advantages and disadvantages of this kind of new actuator principle are smnmarized in Table 6.6. 

Shape memory actuators offer a lot of advantages, but there are also some quite serious drawbacks. When comparing SM actuators with other actuator principles (such as piezoelectric stacks or solenoids), it should be taken into consideration that research for improved shape memory materials is relatively young. With shape memory alloys and actuators slowly gaining commercial importance it is expected that in the next few years new SM alloys will emerge that have higher transition temperatures and good effect stability [85,86]. 

The analysis of the advantages and disadvantages reveals good feasibility and opportunities for electrically heated shape memory actuators, especially in two fields of application  

The advantages of SM actuators listed in Table 6.6 gain importance where small mechanisms are concerned. The following properties recommend utilization of shape memory actuators in millimeter- or micrometer-sized mechanical mechanisms  

There is a strong demand for miniature devices and sophisticated designs 

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