Wireless Electricity: Replicating MIT's Witricity on Smaller Scale

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SUMMARY

The discussion centers on replicating MIT's "Witricity" for wireless electricity transmission on a smaller scale. The user has constructed a transformer using two coils, with the first coil measuring 6 inches in diameter and having 30 loops, while the second coil is 5 inches in diameter with 40 loops. The user successfully lights an LED at a distance of up to 10cm but seeks to increase this range by matching the resonant frequency of both circuits. To achieve this, the user plans to incorporate capacitors and apply the formula F=1/[2(pi) * sqrt(LC)] to determine the resonant frequency, but requires guidance on measuring the inductance of the coils.

PREREQUISITES
  • Understanding of electromagnetic induction and transformer principles
  • Familiarity with function generators and their applications
  • Knowledge of resonant frequency calculations
  • Ability to measure inductance using appropriate tools
NEXT STEPS
  • Research methods to measure inductance of coils using an LCR meter
  • Learn about resonant frequency tuning in LC circuits
  • Explore capacitor selection for resonant circuits
  • Investigate advanced wireless power transfer techniques and applications
USEFUL FOR

This discussion is beneficial for electrical engineers, hobbyists in wireless power technology, and anyone interested in replicating or enhancing wireless electricity systems.

rburns
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I'm trying to replicate MIT's "Witricity", but on a smaller scale. I have a coil connected to a function generator and then a second coil (with more loops than the first) connected to an LED. So I guess now I have a transformer. And the LED lights up when the coils are up to 10cm apart. I would like to get more distance - so I think I need to match the resonant frequency of the two circuits, but I'm not sure how. I think I need to put a capacitor in each circuit and use F=1/[2(pi) *sq rt(LC)], to find the resonant frequency, but how do I measure the inductance of each coil? Thanks for any help!
 
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Will you please describe your coils a bit more?
 
The first coil is about 6 inches in diameter with 30 loops and the second is about 5 inches in diameter with about 40 loops.
 

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