| Summary: | Piezoelectric actuators are widely utilized in many research and industrial fields, since they could achieve high positioning accuracy based on inverse piezoelectric effect. However, the working stroke of piezoelectric actuators is always limited, which restricts the further application of piezoelectric actuators. In order to solve this problem on short working stroke, this study introduces an umbrella-shaped linear piezoelectric actuator to achieve a large working stroke. Unlike traditional stick-slip actuators, the PZT stack inside the umbrella-shaped flexure mechanism is assembled vertically to the slider. The composition and motion principle are discussed, and FEM (Finite Element Method) and experiments are utilized to explore the performance of the proposed actuator. Experimental results show that the minimum stepping displacement is 0.495μm in the case that the input voltage U = 30V and the frequencyf = 1Hz; the maximum speed is 992.4μm/s under the condition of the input frequency f = 400Hz and the input voltage U = 120V; the maximum load is 220g in the case of the input voltage U = 120V and the frequency f = 1Hz. This study indicates that the proposed umbrella-shaped linear piezoelectric actuator is feasible and could achieve a stable large working stroke.
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