Overview
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Piezoelectric elements are used as actuators and sensors, as well as oscillator
circuits and filter circuits in the analog electronic circuits. When the
electric potential is applied, the piezoelectric element is deformed. This
is called the converse piezoelectric effect. In JMAG, the analysis of the
piezoelectric actuator using the converse piezoelectric effect can be performed
by specifying the permittivity matrix and the electric potential for the
material.
This note presents the use of structural analysis to evaluate the displacement
of a bimorph piezoelectric actuator, caused by the inverse piezoelectric
effect. |
Displacement
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Figure 1 shows the state of displacement and the displacement vector. The
part outlined in red is the piezoelectric actuator at the initial position.
In this analysis, one edge of the piezoelectric actuator is secured, so
the other edge can freely be displaced when the electric potential is applied. |
Electric Potential-Displacement Characteristics
| Figure 2 shows the electric potential-displacement characteristics. The
displacement increases linearly with electric potential. The electric potential
to obtain the target displacement can be estimated from the coefficient
which is obtained from the slope of the line. |
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