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DONE BY:-ROMIL GANDHI
DHRUV BANSALRADHA MEHTA
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WiTricity stands for "wireless electricity.It is a trademark of WiTricitycorporation referring to their devices and
processes .They use a form of wireless energy transferand provide electrical energy to remoteobjects without wires using oscillating
magnetic fields.The term WiTricity was first used for aproject that took place at MIT, led by
Prof.Marin Soljai in 2007.
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Electricity
EnergyCoupling
Resonance
MagneticInduction
ResonantMagneticCoupling
Magnetism
BASICS
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Electromagnetic induction:-It isthe production of voltage acrossa conductor moving through a
magnetic field.Electromagnetism:- It is one ofthe four fundamentalinteractions of nature, along withstrong interaction, weak
interaction and gravitation. It isthe force that causes theinteraction between electricallycharged particles; the areas inwhich this happens are called
electromagnetic fields.Energy/Power Coupling:-Energy coupling occurs whenanenergy source has a means oftransferring energy to another
object.
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Resonance:- It is the tendency of a system to oscillatewith larger amplitude at some frequencies than atothers. These are known as the system's resonant
frequencies (or resonance frequencies). At thesefrequencies, even small periodic driving forces canproduce large amplitude oscillations.Resonant Magnetic Coupling:-Magnetic couplingoccurs when two objects exchange energy throughtheir varying or oscillating magnetic fields. Resonantcoupling occurs when the natural frequencies of thetwo objects are approximately the same.
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WiTricity power sources(transmitter) andcapture devices(receiver) are speciallydesigned magnetic resonators that efficiently
transfer power over large distances via themagnetic near-field.
These proprietary source and device designs
and the electronic systems that control themsupport efficient energy transfer over distancesthat are many times the size of thesources/devices themselves.
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Two resonant objects of the same resonant
frequency tend to exchange energy.It exchange energy strongly ,while interactingweakly with living beings and other environmentalobjects.Coupled resonators are said to be operate in
strongly coupled regime to avoid material absorptionand radiative loss.
Strength of interaction is very high.Coupling constant g>=1Energy transfer is very efficient.The rate of energy transfer is substantially higherthan rate of energy lose.
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Power source isconnected to ac power.
Bulb is connected to
capture device.
Blue lines representthe magnetic near fieldinduced by the powersource.
Yellow lines representthe flow of energy fromthe source to thecapture coil.
This powers light bulb.
The magnetic field canwrap around theobstacle between
power source andcapture coil.
Diagram of power source and capture device
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Witricitys Technology Technology Benefit
Energy transfer via magneticnear field
High efficiency over distance
Non radiative energytransfer
Can penetrate and wraparound obstacles
Scalable design From Mw to kW
Scalable design Device that can fit into OEM(original equipmentmanufactures)products
FEATURESANDBENEFITS
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Consumer electronicsIndustrialTransportation
No need of power cables and batteries.No need of line of sight.Does not interfere with radio waves.Wastage of power is small .Negative health implications.Highly efficient than electromagnetic inductionLess costly.
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