Wireless Power Transmission with Electromagnetic Inductive Coupling

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: W31P4Q-08-C-0032
Agency Tracking Number: 07SB2-0523
Amount: $98,913.00
Phase: Phase I
Program: SBIR
Awards Year: 2007
Solicitation Year: 2007
Solicitation Topic Code: SB072-038
Solicitation Number: 2007.2
Small Business Information
605 Mercury Street, Raleigh, NC, 27603
DUNS: 148040447
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Stephen Norton
 research physicist
 (919) 839-8515
Business Contact
 Lynda Redner
Title: administrator
Phone: (919) 839-8515
Email: redner@geophex.com
Research Institution
This project addresses the problem of the wireless transfer of power between a source and nearby mobile platform such as a robotic vehicle. The primary objective of this research will be to design and evaluate, by analysis and computer modeling, an inductively-coupled system consisting of an optimally-designed configuration of transmitting coils to maximize the coupling efficiency though a target receiving coil. In particular, the concept of “inductive focusing” or “flux focusing” will be explored. Briefly, this is the idea of controlling the currents in a set of concentric transmitting coils to “concentrate” the magnetic flux through a receiver coil. That is, the transmitter is designed to maximize the flux linkage through the receiving coil while minimizing the flux elsewhere. This can be done by selecting the currents in the coils to reinforce the field linking the receiving coil while simultaneously canceling the fields outside of this coil. This can be formulated as a constrained optimization problem. The advantage of this approach is that minimal power is wasted due to the induction of currents in conducting material outside the target coil.

* Information listed above is at the time of submission. *

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