In the present work three configurations of compact size, large rotation piezoelectric bimorph actuators are proposed and analyzed, and their static response to control voltage is analytically modeled. The actuator configurations can be characterized as thin, coiled, single curvature bimorph piezoelectric shells with thickness polarization and electroded faces. Compared to a cantilevered bimorph, the configurations analyzed in this work are more compact and allow an increase in actuator displacement output — in this case a rotation — without degradation of blocked moment output. The analytical models developed are verified by comparison with finite element results for a set of generic geometric parameters defining each of the three configurations. Relevant electroelastic properties of a typical piezoelectric material are assumed. An excellent correlation of results is found, confirming the accuracy of the analytical modeling of response as well as the large rotation capability of this class of actuators.

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