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Science Foundation in China

Exploitation of shape memory alloy actuator using resistance feedback control and its development
Hiroki CHO1, Takaei YAMAMOTO2, Yuji TAKEDA2, Akihiko SUZUKI1, Toshio SAKUMA1
1. Faculty of Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan; 2. TAKE R&D, 2-7-27, Umeda, Kasukabe, Japan
Abstract:  The relationship between phase transformation and electric resistivity of Ti-42.6Ni-7Cu SMA was investigated. In the isothermal tensile tests, stress—strain curve shows large hysteresis and nonlinearity, whereas the resistivity—strain curve can be fitted by linearity. The resistivity of SMAs can be determined from the volume fractions of the martensitic and austenitic phases. This characteristics leads to that the resistance of the SMAs is used as a parameter of strain of SMAs. A SMA actuator using resistance feedback control system was proposed, which can control and retain positioning at any positions without using sensor devices, and the deviation of position of this system was less than 3 μm.
Keywords:  Ti-Ni-Cu alloy; shape memory alloy; resistivity; shape memory characteristics; phase transformation
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