A fast electro-mechanical clutch element using a piezoelectric multilayer actuator

The mechanism described in the paper is one design in a series of monolithically constructed devices designed around flexure hinges. It generates a 30 Newton stall force, with an unrestrained movement of over 110 mu m, derived from a piezoelectric device which only extends by 15 mu m. Although the device cannot be considered as highly efficient, it transforms the output movement up to a level which can be used directly with components produced to moderate degrees of surface finish. The paper describes a prototype device whose purpose is to rapidly clutch a thin metal strip. The paper details the device and shows performance data including speed of response, electrical clutching energy and mechanical performance. The efficient displacement amplification of piezoelectric devices is seen as a gateway to many differing applications, currently dominated by the solenoid. Many potential applications exist in the field of robot actuation.