wireless non-radiative energy(power) transfer
TRANSCRIPT
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WirelessNon-Radiative
Energy Transfer
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Motivation
Tesla tower:cca. 1904
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WLAN (w ireless local area
network) concept: radiation
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Radiative energy transfer
Omni-directionalradiation
Directed radiation
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Resonance
phenomena
Titania ( 96, Im{}/ 10 -3 )
Barium tetratitanate ( 37, Im{}/ 10 -4 )Lithium tantalite ( 40, Im{}/ 10 -4 )
=65.61, Q=9100
=147.70, Q=1992
Em
=2
2
2
h
Schrdinger equation
EE222
= c
Maxwel l equat ion
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Resonant coupling
resonant object (Source) resonant object (Device)
( )DSDSSS
S aiaii
dt
da ++= ( ) DDSDDD
D aiaii
dt
da ++=
( ) ( ) ( )[ ]
( ) ( )
rrEr
rrErrE
23
0
3
2S
SDSSSD
d
d ( ) ( ) ( )[ ]
( ) ( )
rrEr
rrErrE
23
0
3
2D
DSDDDS
d
d
DSSD
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Example of resonant coupling
START END
Source Device
Distance / Radius6 8 10
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One more example of resonant coupling
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Coupling w ith extraneous objects
( )SSESSS
S aiaiidt
da ++=
( ) ( )[ ]
( ) ( )
rrEr
rrEr
23
0
23
1
2S
ES
SE
d
d
Source Extraneous object
De-x
De-x
e-2D
e-D
Source Device
( ) ( ) ( )[ ]
( ) ( )
rrEr
rrErrE
23
0
3
2 S
SDSSSD
d
d( )
DSDSSSS aiaii
dt
da ++=
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Examples of extraneous coupling
=2.5
Q = 1832
=2.5
Q = 873Q = 1992
Concrete ( 4.5, Im{}/10-2 )Wood ( 1.2-5, Im{}/10-3)Fused quartz ( 4.0, Im{}/10-4 )
= 82
3
1
INITIAL
FINAL
Q
Q
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Robot & Office: simulation
Source Device (robot)
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Robot & Office: radiative scheme
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Robot & Office: non-radiative scheme
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Robot & Office: non-radiative scheme
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B
E
Magnetic resonances
Outside: UE~UB Outside: UE~0Most materials: ~AIR
no interaction with the field!
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Examples of magnetic technology
Magnetically levitating bed
Maglev
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Robot & Office:
magneticresonances
AC source ~10MHz
30cm
1m
3-4m
Q~1000
Q~1000
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Robot & Office: magnetic resonances
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Comparison w ith inductive coupling
L
D
L D L
D
D L
Efficiency R
Efficiency R/Q2
~ R/1,000,000
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Some potential applications
Industrial, military, and household robots
Portable personal electronics Electric vehicles
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Other possible applications
Confidential radio-communication
Optical free-space interconnects for electronic logic circuits
Energy supply for RFIDs and/or nano-robots
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Conclusion
mid-range non-radiative
energy transfer scheme
based on resonances
even very simple designs
have promising performance
as a powerful concept, it could
enable a wide range of applications
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Ok, but how come no one
thought of this before?
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Collaborators:
Aristeidis Karalis (MIT)
John Joannopoulos (MIT)
e-mail: [email protected]
Pre-print of this work:
http://arxiv.org/abs/physics/0611063