Patent ID: 8863512

Claim:
A shape memory alloy actuator system comprising: a shape memory alloy actuator which includes a shape memory alloy wire of which, a length changes by being contracted due to heating by supplying an electric power, and by being elongated due to cooling, a mobile object which is movable in a direction in which the length changes, an elastic member on which, an external force in a direction in which the shape memory alloy wire elongates, is exerted, a first regulating body which regulates a range of movement of the mobile object, on an elongation side, and a second regulating body which regulates a range of movement of the mobile object, on a contraction side; a detecting circuit which detects a resistance value of the shape memory alloy wire when the shape memory alloy actuator contracts and elongates; a calculating circuit which carries out a comparison operation of an output signal which has been acquired from the detecting circuit and a signal which has been input by a command section, and calculates an electric current applied corresponding to the resistance value which has been detected; an output circuit which outputs the electric current applied which has been output from the calculating circuit to the shape memory alloy actuator; and a control circuit which controls the detecting circuit, the calculating circuit, and the output circuit, wherein the shape memory alloy wire is arranged to be such that there is a slight slack when the mobile object is in contact with the first regulating body, wherein the calculating circuit calculates a first resistance value at which, a proportion of a resistance change with respect to a change in a unit temperature changes from a first proportion to a second proportion which differs from the first proportion, and wherein the control circuit carries out a position control of the shape memory alloy actuator by the first resistance value, when the shape memory alloy wire is to be elongated.