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INTRODUCTION
Background of the Study

//insert problem on lack of energy here (research team?)
//insert SDG statement chuchu here (research team?)
Many countries today are investing on renewable energy harvesters to respond to
several energy problems and issues that the world is currently facing, including the frequent
power outages in the rural areas. Energy harvesting can be performed in different sources such
as ambient mechanical vibrations, thermoelectric, solar, gas/liquid and wind (Kurt et. al, 2014).
Furthermore, solar panels, wind turbines and piezoelectric devices have led the growing
innovations of harnessing such untapped energy sources from our environment.
Piezoelectricity is the appearance of an electrical potential across the sides of a crystal
when it is subjected to mechanical stress. When the piezoelectric material is placed under
mechanical stress, a shifting of the positive and negative charge centers in the material takes
place. This results in an external electrical field. When reversed, an outer electrical field either
stretches or compresses the piezoelectric material. Such piezoelectric systems are good
solutions for energy conversion due to their easy installations and high energy densities.
Piezoelectric devices are embedded within existing infrastructures. As a result, they can
harvest energy for unsuitable climate conditions such as lower wind speeds or very light rain.
The harvested energy per material volume of a piezoelectric is high compared with the
conventional solar and wind energy applications (Kurt et. al, 2014). Therefore, harvesting
energy by the piezoelectric system has some advantages for the feeding of small-scale devices.
Statement of the Problem

Just like every renewable energy device, the disadvantages of using piezoelectric
materials do exist. One of which would be its short life span due to mechanical contact (Kurt et.
al, 2014). In addition, the problem with piezoelectric transducers is their low current production
due to the requirement of a constant alternation between applying and removing pressure on
the piezoelectric transducers to continuously generate power (Priya, 2007). Using piezoelectric
transducers, once stress is applied, voltage will be produced instantaneously, thus the need of a
constant alternation between applying and removing pressure on the transducers to continually
generate power. In addition, the current produced is dependent on the speed at which the
alternation between the stressed and expanded form of the piezoelectric transducer happens. If
the application is at a slower pace, lower power is generated due to the low current output.
Objectives:
To be able to create a contactless piezoelectric shaft modification system which will
generate power when a power generator’s shaft turns, creating an additional source of power.
This contactless piezoelectric system will utilize magnetic repulsion to generate mechanical
stress to the piezoelectric material. When the wind flows through the blades, the shaft would
rotate about the shaft axis. The permanent magnet attached to the end of the shaft is rotated.
When the magnet gets closer to the magnet, which would be attached to the tip of the
piezoelectric layer, the layer is bent downwards without any mechanic contact, since the poles
of the magnets are same. Thus, every rotation creates a vibration that would be converted to
the electrical potential on the piezoelectric layer. This proposed study would be utilizing a
contactless operation with the use of magnetic repulsion to prolong the lifespan of the
piezoelectric material. In addition, the speed of the shaft as it rotates about its axis is sufficient
to continuously generate and remove pressure from the piezoelectric transducers to generate
enough current to make a significant amount of power.
Significance of the Study

The prototype construction of a Contactless Piezoelectric Shaft Modification System
provides a way to enhance our currently available energy harvesting devices. This feature is
very important for the durability of the piezoelectric layers that are continuously subjected to
mechanical stress and enhances the power generation of the transducers. Moreover, the use of
the magnetic effect increases the life span of the piezoelectric layer since any mechanical direct
contact is not made on the layer. This provides avenue to improve the power generation of the
currently existing renewable energy sources.
Prototype Design and Specifications
Figure 1. Design of the prototype

Case:
Spec - 3mm (3.60kg per sqm) acrylic Cube with
Dimensions - 0.5mx0.5mx0.5m
Weight - 5.40kg
Price - PHP 900
Magnets:
Spec - n42 neodymium x 6 pcs
Dimensions - 50mm diameter x 3.5mm thick
Weight - negligible
Price - PHP 5800(first4magnets.com)
Piezoelectric Generators:
Spec: 49Hz EH Resonant Frequency x 4pcs
Dimensions: 5.54cm x 2.34cm x 0.074cm
Weight - negligible
Price - PHP 8000 (piezo.com)
Shaft:
Spec: Material TBD
Dimensions: 10cm dia x 60cm length
Weight: TBD
Price: TBD
Bibliography
Uzun, Y., Demirbas, S., & Kurt, E. (2014). Implementation of a New Contactless Piezoelectric
Wind Energy Harvester to a Wireless Weather Station. ELEKTRONIKA IR
ELEKTROTECHNIKA, 20, 10th ser., 35-39. Retrieved August 21, 2017.
Priya, S. (2007). Advances in energy harvesting using low profile piezoelectric transducers.
Journal of Electroceramics, 19(1), 167-184. doi:10.1007/s10832-007-9043-4

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Background of the Study

Statement of the Problem

Significance of the Study

Prototype Design and Specifications

Figure 1. Design of the prototype

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