2010 年 34 巻 6 号 p. 584-587
This paper describes a new type of actuator composed of a shape-memory-alloy coated magnetic ribbon that detects any deformation of the shape memory alloy. The ribbons reversibly deform by heating or cooling in the temperature region from 10°C to 80°C. The deformation causes a change in the mechanical resonant frequency, which can be detected wirelessly with a pick-up coil. The deformation of the ribbons is confirmed to be proportional to the mechanical resonant frequency with an accuracy of ±0.58%. A heat-driven actuator with a high positioning resolution will be realized by monitoring the resonant frequency and feeding back it to the heating power.