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Abstract
The fundamental study of a shape memory piezoelectric actuator was conducted, using operated with a pulsed voltage, so that low energy consumption and low voltage operation could be realized. To realize the shape memory operation of the piezoelectric actuator, an imprint electrical field was induced with a high electrical field of 3.5 kV/mm in a 150°C environment. The memory effect of the displacement and the permittivity of the shape memory piezoelectric actuator resulted from the asymmetric butterfly curve caused by the imprint electrical field. The actuator has two stable strain conditions and permittivity values that were dependent on the direction of polarization, imparting the shape memory effect and permittivity memory effect. Furthermore, self-sensing operation was realized by detection of the permittivity that corresponds to the position of the actuator.