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Microwave wireless power transmission technology has broad application prospects in improving the endurance and range of unmanned equipment. It is also of great significance in the field of the Internet of things, which can effectively solve the problem of energy supply for devices in the Internet of things. In addition, using vehicle-mounted micro...
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Citations
... Far-field transfer uses electromagnetic waves to transfer energy. It can be divided into two groups: microwave power transfer [7] and laser power transfer [8]. Although the transmission distance of far-field power transfer is long, It has the significant disadvantage of low transmission efficiency. ...
This paper presents the design and modeling procedure of a wireless power transfer (WPT) system applied to In-wheel-motor (IWM). The system is designed to transmit over 10 kW of power following the physical constraints faced by the IWM applications. The issues of coil misalignment and load change are discussed as particular scenarios in IWM. The finite element model is built for circular, rectangular, and double-D coils, finding that the rectangular coil has the best performance considering the transmission interval and misalignment resistance. The circuit design procedure is presented, and the analysis of the influence of load and mutual inductance change on the WPT system is addressed. Finally, the performance of the design is verified with experiments on a full-scale prototype. It is proved that the WPT system successfully transmits 10 kW of power with a DC–DC efficiency of over 90% under a transmission interval of 140 mm. The output voltage is stable under 40mm coil misalignment scenarios and over 50% load change.
... A significant advantage of this type of transmission is the high value of the transmitted power, very good adaptation to the environment, and great flexibility in transmitting and receiving signals. Due to these factors, this type of energy transmission is used when there is a need to supply devices located at long distances apart and operating in different weather conditions [25,28]. However, a significant limitation in the use of this technology is the very low transmission efficiency, not exceeding 10% [25,28], and the need to use very large transmitters (antennas). ...
... Due to these factors, this type of energy transmission is used when there is a need to supply devices located at long distances apart and operating in different weather conditions [25,28]. However, a significant limitation in the use of this technology is the very low transmission efficiency, not exceeding 10% [25,28], and the need to use very large transmitters (antennas). This solution is also very expensive. ...
This paper presents the current state of knowledge in the field of wireless power transfer. The concept of such a transfer and the basic methods of its implementation are described, together with block diagrams of the necessary devices. The technologies of electrical power transfer over short and long distances are characterized. The most popular electrical power transfer technology based on the phenomenon of electromagnetic induction is discussed in great detail. The analysis of the influences of such factors as the coupling factor, the shape of the coils, the type of ferromagnetic material from which the core of the coils is made, and the mutual position of the transmitting and receiving coils are analyzed on the properties of the wireless power transfer system. The advantages and disadvantages of the used technologies are shown. Furthermore, a wireless power transfer system is presented for charging the batteries of electric vehicles. The standards of wireless power transfer are also presented, and development trends are outlined.
The creation of a wireless electricity transfer prototype has been a focus of active research in recent years due to its potential to completely alter the way of transmission and distribution of electrical energy. This prototype makes use of resonant magnetic coupling, which dispenses with the requirement of physical wires and enables the effective transfer of electrical energy across small distances. The transmitter and receiver units in this concept each have resonant coils that can resonate at the same frequency. Alternating current from the transmitter unit forms a magnetic field, which in turn causes a current to flow through the receiver unit's resonant coil. The electrical equipment or batteries can then be powered by this induced current. Optimizing the coils’ resonance frequency, reducing electromagnetic interference losses, and assuring the security of the wireless energy transfer are just a few of the difficulties that had to be overcome during the creation of this prototype. The model has, however, demonstrated encouraging results in terms of its efficiency and dependability, and significant progress has been made in overcoming these issues. In the future, this technology may be used for a variety of purposes, such as wirelessly charging of electric vehicles, powering sensors and gadgets from a distance, and doing away with traditional power lines in homes and workplaces.
