2013SymposiumonPiezoelectricity,AcousticWaves,andDeviceApplications,Oct.25Ͳ27,Changsha,Hunan,CHINA
A Fluid Energy Driven Piezoelectric Generator
Yi-hua HUANG*, Xu-jian SU, Wen-jin HUANG
School of Information Science and Technology, Sun Yat-sen University, Guangzhou 510006, P.R. China
*Corresponding author, E-mail: huangyih@mail.sysu.edu.cn; Tel.: 86-20-39943328
This study demonstrates a novel fluid energy driven piezoelectric generator with simple structure for generating
the electrical power from fluid energy, such as wind energy or water energy. The key components generating the
electrical energy in the fluid energy driven generator are series of fixed-fixed piezoelectric composite beam.
Potentially, because all the fixed-fixed piezoelectric composite beams in one generator are in phase with each
other, the output voltage of the generator can be magnified. The distributed electromechanical model of the
generator is derived and the steady state response is obtained. The theoretical results are compared with the FEA
simulation results, both agree well with each other
.
Keywords:
Fluid energy driven generator; Piezoelectric composite beam
1. INTRODUCTION
In the last decade, how can we effectively harvest
energy from the ambient to power the wireless
sensor nodes has become a hot point of research.
Since the fluid energy can be easily find in the
natural environment, many researchers have
proposed micro wind mills or micro turbines to
provide the electrical energy to the wireless nodes.
Unfortunately, the structures of the proposed micro
wind mills or micro turbines are relatively
complicated and the maintenance cost is very high.
Besides, the existing of the magnets and coils in the
proposed micro wind mills or micro turbines may
induce the EMI problems. Therefore, the
piezoelectric generators have been proposed.
As we know, for the same excitation, the
deflection in the clamped-clamped beam is smaller
than that produced by the cantilever beam with the
same geometry size. Therefore, the research on the
piezoelectric clamped-clamped beam for fluid
energy harvesting is rare. But the clamped-clamped
beam has its own advantage, therefore, we proposed
a novel fluid driven piezoelectric generator consists
of piezoelectric actuators arranged along the
circumference and parallel to the axis of the
generator in the piezoelectric clamped-clamped
beam form.
2. STRUCTURE AND PRINCIPLE
The structure of the fluid driven piezoelectric
generator with six stators is plotted in Fig. 1. ,
which is similar to that of the traditional
electromagnetic generator, but the new fluid driven
piezoelectric generator does not use any magnets
and coils. The rotor of the new fluid driven
piezoelectric generator is only a simple
non-electronic polygonal column, and its stators are
composed by several clamped-clamped composite
piezoelectric beams which are encircling the rotor
and meanwhile parallel to the shaft. Therefore the
structure of the new generator will be simplified
greatly. The composite piezoelectric beam is
composed by the substrate and the composite
piezoelectric ceramic layers. The substrate is made
by the spring steel or other similar springing
materials and it is facing to the rotor. The composite
piezoelectric ceramic layers are adhered to the
substrate and are opposite to the rotor.
Figure 1. Fluid driven piezoelectric generator
Fig. 2 plotted the cross section of the fluid
driven generator shown in Fig. 1. The circle plotted
with the dotted line indicated the natural positions
on which the stators are not pushed by the rotor.
Depending on the number of the stator, the contour
line of the rotor is composed by the same number of
the sections of certain kind of function curve, e.g.,
sinusoidal curve. When the blades are driven by the
fluid motion, the rotor will leave the natural place to
push the piezoelectric beams continuously. Since
more than one composite piezoelectric beam will be
978-1-4799-3289-4/13/$31.00 ©2013 IEEE
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