In this paper, we present the results of theoretical study of thin film technique based micro grippers. Three most popular actuation mechanisms, namely, piezoelectric, bimetal and shape memory alloy are investigated. First, we present the simulation results against the measured behavior of NiTi shape memory alloy thin film based micro grippers. Then we compare the performances of these three kinds of micro grippers. It shows that shape memory alloy based micro gripper is much better than the others.
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