Transcript Final Poster

Connor Fields
Jordan Guttrich
Andrew Thurston
Alex White
MIE 415 Fall 2013 - ECE 416 Spring 2014
Team 9 Senior Design Project
Kinetic Energy Harvester
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JK
• The motivation for the project is to prove that a
useable amount of energy can be captured
from everyday motion
• The objective is to build a device that captures
energy which is otherwise wasted
• Project focuses on converting human
mechanical energy to and storing as electrical
energy in a turnstile
• Turnstile design 1.0 consists of a crank
attached to a system of gears which spin a
generator at high speed to produce electrical
energy
• Target Project Specifications
✓ < 20lbf to rotate crank
✓Generator output > 3V at peak from 1/3 of a crank
rotation in 1.5 seconds
✓< 3 sets of meshing gears
✓Standard size turnstile frame must enclose gears
and all crush points
✓Multicolor LED display to sequentially illuminate as
capacitor charges
✗Energy conversion efficiency > 40%
Actual average efficiency = 10.2% measured
between 0-90% of full cap voltage
✗
Dual voltage output boost power supply active
when cap voltage exceeds 1V (heat failure)
☐ Ratcheting arm mechanism with flywheel
• Large scale turnstile potential
– 20 turnstiles in continuous use could yield 16K full
turns per hour
– 350 est. pedestrians charges a 2.7V 100F
supercap to 80% of full charge (230J)
– With average efficiency taken from 0-90% charge
of cap voltage range, the arrangement would
capture 35KJ/hr
• Proof of Concept: a hand crank turning a 10:1
belt driven wheel attached directly to the
generator and then to a bank of LEDs
– Proved that cranking would charge
supercapacitor and illuminate LEDs in a
reasonable amount of time
– Volts/RPM measured using an optical tachometer
to find appropriate gear ratio
SPICE Boost
Power Supply
Schematic
• Supporting Engineering Analysis
– Permanent magnet DC generator must spin at a
minimum of 800 RPM at peak for the supercap to
charge effectively
– Gear ratio must be 60:1 assuming 13.3 rotations a
minute (40 people passing through per minute)
– LEDs become active at certain intervals as the
supercap is charged using variations in diode
forward voltage drop characteristics
• Project status
– 2.0 model will address unresolved issues
– Supply redesign necessary due to heat concerns
– On track for project completion in May 2014
• Second semester recommendations
– Design a ratcheting turnstile arm to replace crank
– Design a flywheel to boost efficiency to 20%
– Find power ICs in manageable package sizes and
incorporate a SMD adapter
– Debug in time to get a reliable PCB manufactured
Department of Mechanical & Industrial Engineering