Disney Tips Hat to Tesla, Creates Wireless Charging
Echoes Tesla's idea for universal power
February 17, 2017
folks at Disney Labs have come up with a way to charge electronics without
using the dreaded power cable.
“Quasistatic cavity resonance,” or
QSCR, is said to wirelessly transmit power throughout a room that enables
recharging through Wi-Fi,
“eliminating the need for electrical
cords or charging cradles.”
USCR was inspired by something the great
Serbian-American genius, Nikola Tesla, once proposed to provide universal free
electricity to the world—essentially bouncing a standing electromagnetic
wave between the ground and the ionosphere. The Disney crew
scaled it down a bit, and set up a standing electromagnetic wave in a
purpose-built, metal-lined 16-by-16 foot room at the lab. Researchers referred
to the process colloquially as “volumetric wireless power for livable spaces.”
we really want is a three-dimensional charging experience where you walk into
your living room or office and your cellphone is charged simply by walking in,”
said Alanson Sample, associate lab director and principal research scientist at
the Disney Research Pittsburgh facility.
Matt Chabalko, associate research scientist, described how a copper pipe was installed in the center of the room that was cut and fitted
with discrete capacitors that “set the electromagnetic frequency infrastructure
and confine the electric fields.”
resonance frequency, Chabalko said currents travel through pole at 1.3 million
times per second. The currents travel up across the ceiling, down the walls and
back across the floor to the pole again. These currents generate magnetic
fields that circulate around the pole, he said.
used in this initial set-up had to be oriented perpendicular to the magnetic
fields. Researchers created “orientation independence,” according to Chabalko,
by setting up three coils in a three-coil orthogonal system.
the experiments demonstrated room-sized wireless power, Sample said, “there’s
no reason we couldn’t shrink this down the size of a toy box or charging chest,
or scale up to a warehouse or a large building.”
said the electromagnetic field was safe for human exposure by federal standards.
“Our simulations show that when you
transmit 1.9 kilowatts power while meeting federal safety guidelines,” he said.
“This means it’s completely safe for people to occupy this space for any amount
said channeling the induced currents through discrete capacitors isolates
potentially harmful electrical fields. The 1.9 kW power level is equal to
simultaneously charging 320 smartphones, Chabalko said.
Chabalko and Sample were joined in the work by Mohsen Shahmohammadi, lab associate at Disney Research. Their “Quasistatic Cavity Resonance for Ubiquitous Wireless Power Transfer” research paper and data sets, as well as illustrations, are available at the Disney’s website as well as at the Public Library of Science.