Abstract
A new structure of piezomotor using a flextensional coupler is proposed. Two longitudinal actuators and an elliptical shell constitute its frame. The basic structure and the operating mode are first presented. The coupling between a translation mode and a flexion mode generates an elliptic motion at shell tops. The design method based on a finite element model and an electromechanical equivalent circuit permits the structure dimensioning. Construction of motor prototypes indicates the reliability of the principle, a good agreement with design results and interesting motor performances.
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