New type of miniature linear actuators named "CyberneticActuator" for bio-medical applications have been developed. This actuator has four driving states such as free, increasing, decreasing and lock. Especially the state of free and lock can release excessive applied load from outside to provides safety characteristics for both human and micro mechanism. In this paper miniaturized linear Cybernetic Actuators combining piezoelectric impact drive with electromagnetic clamping are design and developed.Feasibility and basic performance of the actuators are conformed by theory and experiments . Not only four driving states as the Cybernetic Actuator but also drastic improvement of performance such as maximum speed, energy efficiency and silent drive as a miniature linear actuator are verified successfully by using "controlled friction impact drive".
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