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Advancements in Wireless Power
Bhuwan Ghimire, Andrew R. McHugh, Haleem Azmy -Department of Physics
Westminster College, Fulton, MO
Early 20th
Century brought some ideas to the creative genius Nikola Tesla
about the possibility of electricity or more clearly power being transferred wirelessly.Teslas invention of Tesla Coil proved to be very inefficient with respect to the area
and the needs of wireless power. Teslas coil requires huge amount of voltage and a
strong electric field which was not very appropriate for the advancement of wireless
electricity.
Some years before the present day, a group of scientists and students at MIT
came up with an idea of wireless power. Their vision was to create two strongly
coupled resonances with support of magnum coils. The idea was to provide an
alternating current to a coil of wire which would create a magnetic field around it
which would induce the same magnetic field around the other coil of wire. Eventually
this alternating magnetic field would create an A.C. on the wire which could light a
bulb or even charge a cell phone.
We explored their ideas and theories and decided to conduct a research on our
own on a small scale and try to get some theoretical concepts. The frequency at which
the alternating current would be induced at the first coil would be the most critical
factor. Other factors like the width of the coil and number of turns would also playtheir respective roles as in electromagnetic induction.
Induction
Faraday found that the induced e. m. f. is given by:
where FB is the "magnetic flux" through the circuit.
The negative sign means if the flux is increases with time, the induced e. m. f. will
drive the current in the opposite direction to the current flowing in the loop due topresence of B.
Magnetic flux is the "flow" of B through the area of the loop.
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Our research gave us some interesting results. They showed a linear relation
between induced voltage and the distance between the coils until a point of 1.4 meters
distance between the coils. After that, the relation was changed to be an inverse
square between the two properties. Frequency graphed against voltage showed a very
interesting result as well. From 1 MhZ ro 20 MhZ, the induced voltage increased to a
high-peak, then decreased until it increased to a low peak again and the finally
decreased.
1) V(Induced) d when d 1.4 m
2) V(Induced)1/(d)^2 when d> 1.4 m
3) PV(Induced)
We had some limitations on our research. The perfect construction of a coil was not
available and we had some calculation error due to improper impedances.Our major achievement so far has been lighting a LED bulb with a power as
small as 0.008 volts wirelessly! The research is in progress. Some data that we have
received so far will make things more clear in the following pages.
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Total Data So far!
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