| 摘要 |
PURPOSE:To prevent a shape memory alloy from losing the stored shape or deteriorating the shape recovery characteristic by providing a means to prevent the overheating of the shape memory alloy. CONSTITUTION:When a load is increased and the temperature T of an actuator 1 exceeds the upper limit T1 of the normal operating range, an excitation cutoff section 10 is deformed, the excitation cutoff section 1c is connected to a terminal 2. Both ends of the actuator 1 is short-circuited, the excitation is interrupted, the overheating of the actuator 1 made of a shape memory alloy is prevented. When the temperature T of this actuator 1 is returned to T1 or below, the excitation cutoff section 1c is separated from the terminal 2, the excitation is restarted. |
