Most multi-axle UAVs based on on-board batteries are generally difficult to surpass 30 minutes after a single charge, which greatly limits their capabilities. Although energy can be delivered via cables, this is only suitable for small-scale applications such as suspended observation. However, scientists at Imperial College London have developed a new type of drone that does not require batteries and power cables because it can wirelessly capture the energy needed for flight. The study was based on an off-the-shelf mini- quadcopter, but it removed the on-board battery and put it on a copper coil. In addition, the researchers also created a separate wireless power transmission platform. The copper coil on the aircraft acts as a receiving antenna for the magnetic field (which can generate alternating current), rectifies the DC, and then powers the drone. The official name of this technology is "inductive coupling", which was developed during Nikola Tesla's time. Empire Institute of Technology said that this is the first time they have provided wireless energy for in-flight drones. Although it is currently only applicable to a distance of 10cm (3.9 inches), it is expected to greatly expand its application range in the future. Of course, in addition to wirelessly powering drones in flight, this technology can also be used to charge on-board batteries to extend the flight (without the need for landing charging/recharging batteries).
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