Piezoelectric Transducer Electromechanical Model
by Dennis L. Feucht
Innovatia Laboratories
Piezoelectric devices change shape when subjected to an electric field.
They are emerging in importance in molecular mechanics (as positioners),
in medical diagnostic and surgical equipment, and for vibration or noise
suppression. As a particular kind of energy converter or transducer -- translational,
electric (or electrostatic) machines -- they can be modeled using basic
electromechanics theory, as presented for instance in Electromechanical
Motion Devices, by Paul C Krause and Oleg Wasynczuk (McGraw-Hill, 1989).
While the familiar magnetic motor, with energy stored in a magnetic field,
dominates electric-machines textbooks, Krause and Wasynczuk also present
the dual theory of machines with their energy stored in electric fields.
We start here with the more familiar magnetic machine model and work
toward a circuit model of the solely electric machine. This model can then
be used in design to predict and analyze the behavior of driver amplifiers
and the motion control aspects.
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