Highly efficient piezoelectric phasing - unipolar - actuators with a notched pzt back disk

摘要

Disclosed herein is a high efficiency piezoelectric single phase uni-polar supersonic actuator which is composed of an upper back disc, a PZT plate an electrode, a lower back disc, a pivotal bolt and a fixing nut. The PZT plate and its electrode are interposed between the upper and the lower back discs, and the whole actuator unit is supported and fixed with the pivotal bolt and the nut combination by passing the bolt coaxially through the center of the actuator unit. The parametric output variation of the actuator is carried out by an asymmetrical structure due to varying number, size and location of notches, or a variety of notch and screw combination made on the upper back disc such that after the electrode is energized, the actuator produces an unbalanced periodic axial or transverse thrust force to drive a rotor installed on the pivotal bolt above the upper back disc. The maximum rotating speed of the rotor may reach up to above 3000 rpm.