Development of a rotary piezoelectric platform with smooth displacement output based on tripod cooperation force adjustment mechanism

Inertial piezoelectric platforms have gained widespread attention for their high resolution, fast response, simple exciting scheme and structure. However, current inertial piezoelectric platforms face challenges in achieving smooth displacement output due to the inherent backward motion. To address this issue, a tripod cooperation force adjustment mechanism is proposed and a rotary piezoelectric platform is developed to achieve smooth output. The piezoelectric platform adopts three patch-type piezoelectric units to adjust the driving force in the operating cycle. The direction of the resultant force remains unchanged in the slip motion period as two units still move forward when one unit moves back, and the rollback displacement can be avoided. The structure of the rotary piezoelectric platform is designed by the assistance of theoretical and simulation analyses. A prototype is fabricated and its experiments are performed. Smooth displacement output is achieved based on the proposed tripod cooperation force adjustment mechanism, which could significantly suppress the backward displacement compared with the traditional force adjustment mechanism.