Piezoelectric motor is based on generating traveling waves on a finite structure. It can be classified into linear and
rotary types. Among them, linear motors have an inevitable problem since finite boundaries are always exist, and reflected
waves can hinder the formation of propagating waves. To solve this problem, a linear motor based on a single driving
frequency and two induced resonant molds are previously reported. However, the driving frequencies are not at structure
resonant frequency, the efficiency of linear motor is based on the superposition of two adjacent bending modes. The
traveling wave is created by two piezoelectric actuators driven by a single frequency in between these two resonant molds
with a 90° phase difference. Based on previous report, it shows that by placing these two 0.178/L length actuators at 0.22/L
and 0.78/L on a one-dimensional beam with length L, an optimal performance could be reached. It suggested that the
location and size of the two piezoelectric actuators can be used to optimize the performance of the linear motor. In this
study, finite element simulation was used to study the contributions of the temporal and spatial correlations between the
two actuators with respect to a 1-D linear motor. The position and size of these two piezoelectric actuators are studied for
optimizing the performance of the linear motor.
In comparison to more developed optical method for microparticle manipulation like optical tweezers, an optopiezoelectric actuating system could provide force output that is several orders higher. Taking advantages of photoconductive materials, the concept of integrating a virtual electrode in a distributed opto-piezoelectric actuators was developed for real-time in-situ spatial tailoring for vast varieties of applications in biochips, smart structures, etc. In this study, photoconductive material titanium oxide phthalocyanine (TiOPc) was used as the active ingredient to enable the virtual electrode in an opto-piezoelectric material based distributed actuator. By illuminating light of proper wavelength and enough intensity onto TiOPc photoconductive material, the effective impedance of the illuminated portion of TiOPc could drop significantly. The contributions of using additives in the TiOPc photoconductive electrode to adjust the electrical properties was investigated for optimization. Further, the two-mode excited linear ultrasonic motor was also studied and the feasibility to integrate the TiOPc photoconductive electrode was discussed. The flexibility provided by this newly developed system could potential deliver versatile performance in biochip applications.
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