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_______________________________________________. 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

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_______________________________________________

  • 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
  • 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
  • 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

  • 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

SPICE Boost Power Supply Schematic

Department of Mechanical & Industrial Engineering