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P12414: Bicycle Energy Harvester
2011-2012
Objective:
To transform mechanical energy produced riding a bicycle into
electrical energy with intention to charge a cell phone. Our device is
designed to be cheap to build, easy to install, maintain and use.
Background and Motivation:
People in countries with inadequate
infrastructure have an unmet need for
electricity. Sources for creating and storing
power are difficult to obtain. This system
provides the energy required for
communication, light and water treatment.
Brenda Lisitano – ME [2]
Dan Tobin – ME [5]
Aaron Sieczkarek – ME [4]
Zheng (Flora) Li - EE [1]
Amina Purak - IE [3]
Concept Selection:
Initial concepts taken into
consideration include harvesting energy via
vibration, building a generator with
magnets on the spokes, a hub generator
and the final design of a roller with a
motor. Ease and reproducibility of power
harvesting is the main reason for final
selection.
Figure 2: Motor Assembly [CAD]
Figure 1: Electronics Box Assembly
Figure 3: Electronics Box Assembly [CAD]
Figure 4: Motor Housing Assembly
Program: Solidworks Total Part Files: 29 Distinct Parts
GND
IN
OUT
2
1
3
1
U4
LM340-5
12V DC motor
C7
10u
C8
10u
C9
.1u
A-type USB
Connector
4
Circuit Discussion:
The circuit for the device conditions
and regulates the electric power generated
by a 12V DC motor. The three capacitors
stabilize the non-linear voltage input while a
5V voltage regulator reduces the voltage to a
5V constant output. The power is supplied to
small electronic devices via an A-type USB
connector which is standard.
0
Figure 4: Voltage Regulating Circuit
In order to harvest the bicycles energy the
device must output a minimum voltage. This
voltage will then be transferred to a device to
store the energy for later use.
Figure 6: Required Velocity
Specification
Units
Ideal Value
Actual Value
Device Cost
$(US)
<20
$16.62
Range of Bikes
Tire size (cm)/(in)
60.6-71.1(cm)/
24-28 (in)
60.96-68.58(cm)/
24-27(in)
Range of Phones
% of top 10 selling
Haitian phones
90%
Dust Proof
IEC60529 Level
6
6
Water Proof
IEC60529 Level
4
4
Results & Conclusions:
Our device shows promise
for a system that can be manufactured and
utilized in countries such as Haiti
Future Recommendations:
System optimization can be
completed by creating iterations with less
parts for mass production. Also, waste
energy collection can be implemented into
the system design.
Acknowledgements- Special thanks to Ms. Sarah Brownell, R Community Bikes, Gerry Garavuso
For more information please visit our website at : https://edge.rit.edu/content/P12414/public/Home