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Recently, Japan's NEC Corporation demonstrated an underwater wireless power supply system
for small underwater drones at the "Japan Defense Equipment Agency Technical Seminar 2015".
The system can be used as a submarine power supply station, and can also be used in the defense field, using the transceiver antenna of autonomous eddy current transmission technology for power supply
.
In the past, when using underwater drones for activities such as seabed exploration, every time it was necessary to recharge, the mother ship had to be used to tow the drone up, replace the lithium-ion secondary battery, etc
.
In order to solve the battery replacement problem, the system released by NEC this time can be used as an undersea power supply station, and a transceiver antenna using autonomous eddy current transmission technology is installed to supply power to the battery
.
In the experiment, an underwater drone manufactured by Kanazawa Institute of Technology successfully achieved long-distance power supply
of more than 10cm in seawater.
Other companies use magnetic resonance products with a power supply efficiency close to 0%
at a distance of 15 cm.
In the NEC system, however, the power supply efficiency decays slowly as the power supply distance increases, and the power supply efficiency is about 40%
at a distance of 15 cm.
Since the far-field region that propagates in a plane wave under water cannot obtain the electric field strength required for power supply, near-field (electromagnetic field at the same distance as a wavelength) electromagnetic wave
is used.
NEC said it is considering practical applications
such as installing transceiver antennas on the seabed around the coastal part and installing transceiver antennas at the bottom of power supply boats and power supply boats in the ocean-going part to allow underwater drones to be charged close to the transceiver antenna.
The company has been conducting basic research on underwater wireless power supply systems since five years ago, and will make some adjustments to reduce the impact of drones shaking at sea, aiming to put them into practical use
within a few years.
Recently, Japan's NEC Corporation demonstrated an underwater wireless power supply system
for small underwater drones at the "Japan Defense Equipment Agency Technical Seminar 2015".
The system can be used as a submarine power supply station, and can also be used in the defense field, using the transceiver antenna of autonomous eddy current transmission technology for power supply
.
In the past, when using underwater drones for activities such as seabed exploration, every time it was necessary to recharge, the mother ship had to be used to tow the drone up, replace the lithium-ion secondary battery, etc
.
In order to solve the battery replacement problem, the system released by NEC this time can be used as an undersea power supply station, and a transceiver antenna using autonomous eddy current transmission technology is installed to supply power to the battery
.
In the experiment, an underwater drone manufactured by Kanazawa Institute of Technology successfully achieved long-distance power supply
of more than 10cm in seawater.
Other companies use magnetic resonance products with a power supply efficiency close to 0%
at a distance of 15 cm.
In the NEC system, however, the power supply efficiency decays slowly as the power supply distance increases, and the power supply efficiency is about 40%
at a distance of 15 cm.
Since the far-field region that propagates in a plane wave under water cannot obtain the electric field strength required for power supply, near-field (electromagnetic field at the same distance as a wavelength) electromagnetic wave
is used.
NEC said it is considering practical applications
such as installing transceiver antennas on the seabed around the coastal part and installing transceiver antennas at the bottom of power supply boats and power supply boats in the ocean-going part to allow underwater drones to be charged close to the transceiver antenna.
The company has been conducting basic research on underwater wireless power supply systems since five years ago, and will make some adjustments to reduce the impact of drones shaking at sea, aiming to put them into practical use
within a few years.
