Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 52, Issue 18, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ab0643
Keywords
wireless power transfer; permanent magnet; electromechanical transduction
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Funding
- US Army Communications-Electronics Research, Development and Engineering Center (CERDEC) through the General Technical Services sub-contract [GTS-S-13-226]
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An electrodynamic wireless power transmission (EWPT) approach that utilizes mechanically responsive receivers to safely deliver power in cluttered environments is presented. Mainstream WPT techniques are predominately based on near-field inductive coupling of two coils (MHz) or directed, far-field RF transmission (GHz) between a transmitter and a receiver. These approaches face significant technical hurdles (safety concerns, detuning, parasitic heating) in real-world scenarios where electrically conductive media exists in between the transmitter and receivers. The EWPT approach presented here relies on electrodynamic coupling between a magnetic near-field produced by a transmitter and a permanent magnet in the receiver. This approach enables wireless power delivery using low-frequency (<1 k Hz) fields, which facilitates transmission through and around common electrically conductive media such as metal objects, people, etc. Here, we present an electromechanical model of a rotating magnet receiver in order to analyze the transient and steady-state dynamics of the receiver magnet. We then experimentally demonstrate wireless power transmission with an efficiency of 7% to a 3 cm(3) receiver achieving 1.3 W (0.42 W cm(-3) power density) at 1 cm and 9 mW at 9 cm. These experimental results are well matched by simulations. Lastly, we demonstrate simultaneous charging of two wearable electronic devices in a cluttered environment.
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