Abstract
With the development of unmanned aerial vehicle (UAV), it has been used in many fields, such as aerial photography, military, and transportation. However, it is a challenge for charging due to its short battery life. Wireless charging has been considered as a good UAV solution. In this paper, we proposed a wireless power transmission system (WPT) through inductive coupling and analyzed the power efficiency of the inductive coupling. The WPT included a charging station, which can provide energy through an induction coil array, and a portable energy receiving device mounted on the base of the UAV. Moreover, the power efficiency was analyzed though the equivalent circuit of WPT and the mathematical model of the power efficiency was established. The results showed that the WPT can transfer energy to UAV with high power efficiency within a 30 mm lateral displacement range.
Highlights
In recent years, the performance of unmanned aerial vehicle (UAV) is gradually optimized
Based on the equivalent circuit theory, this paper models and analyzes the wireless power transmission system (WPT) of magnetic coupling resonance, and optimizes the charging distance, power, and efficiency parameters of UAV
2.4 Design of coupling coil The coupling mechanism mainly includes the transmitting coil inside the charging pile and the receiving coil at the bottom of the UAV, which is the core part of the magnetic coupling resonance WPT system
Summary
The performance of unmanned aerial vehicle (UAV) is gradually optimized. UAV can be equipped with many payloads, such as cameras, sensors, positioning systems [6,7,8] These loads are often powered by high energy density lithium batteries, which can only last for 20–40 min [9,10,11]. The first method is to build up a new type battery with higher UAV capacity [20], but this method will cause unexpected high body weight of UAV. It will indirectly reduce the loading efficiency [21,22,23]. The third known method is to build a charging pile on UAV that can recharge the UAV directly
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