Linear actuator with shape memory alloy coil spring operating at low power

摘要

The present invention relates to a linear actuator comprising an electrically-controlled shape memory alloy coil spring (23) suitable for providing a linear displacement in a valve, switch, locking system and provided at each extreme end with a crimped terminal, said actuator comprising: Each crimped terminal includes a crimping component 21 and a coupling member 22 suitable for mounting the spring 23 to the linear actuator. The present invention further discloses the use of said spring ( 23 ) with specific geometrical features and crimping system ensuring maximum available stroke and fatigue life, structural simplicity, low power requirements and thermal inertia, small size.