Shape-memory alloy actuators and control methods

The present invention easily can be made compact and fast acting, and the remarkable to increase the stroke without a reduction in strength, electromagnetic memories with increasing stroke of using active ingredients shape alloy actuators and other actuators (in this application the La SMA actuator collectively); Low power consumption, resistance / obstacle / load sensing, and a shape memory alloy actuator for economic and efficient control and sensing for accurate position control mechanism; And it provides the device with these actuators and control and sensing mechanisms.