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Biomechanical Energy Harvesting

Biomechanical Energy Harvesting. Weekly Meeting 4 September 30 th , 2013. Goals. Look into revolving door company Check into their patent See what they power Estimate the energy generated Apply these principals to a turnstile. Revolving Door. Not patented, limited data available

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Biomechanical Energy Harvesting

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  1. Biomechanical Energy Harvesting Weekly Meeting 4 September 30th, 2013

  2. Goals • Look into revolving door company • Check into their patent • See what they power • Estimate the energy generated • Apply these principals to a turnstile September 29, 2013 2

  3. Revolving Door • Not patented, limited data available • Made by Boon Edam of Netherlands • No batteries involved, only supercaps • unknown cap size, but 60 of them • Switches between self power and grid power • Motor generator used with 2 gear ratios • http://www.boonedam.us/doorsystems/nrg-plus2-tourniket.asp September 29, 2013 2

  4. Mechanical Estimated gear ratio 25:2 September 29, 2013 2

  5. Mechanical Appears to be some large motor generator with gearing September 29, 2013 2

  6. Electrical 60 supercaps, unknown size Some kind of regulator to switch on/off grid September 29, 2013 2

  7. Supercaps Compared to Batteries Pros: • Constant current not needed • Easier to model • Safer to work with, less regulation needed • Widely available parts • Lots of selection • Higher energy density Cons: • Discharge is weeks, not months (still ok) • Limited voltage range 2.3-2.7V only • Cell balancing circuitry needed if multiple caps used September 29, 2013 2

  8. Gearing Ideas • Design prototype using bicycle gears • Cheap (free) • Widely available in mixed sizes • Standardized size means easily compatible parts • Jordan and Andrew examined what gears are available for use on some of their bikes • Connor and Alex did more motor research to try to determine a final ratio between turnstile and motor September 29, 2013 2

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