The force of the induction motor is generated by the change of magnetic flux through the coil, which is the Faraday law of electromagnetic induction. The whole system consists of two parts: sending and receiving. The load process can be summarized as follows: first, the DC is input, then the DC is converted into high frequency AC current through active crystal oscillator and transmitted to the transmitting coil. A high frequency magnetic field is generated around the transmitting coil, and the magnetic field is received by the receiving coil, and the induction motor force is converted into DC, which can be charged by the battery through rectification and filtration. The load distance is only in the order of millimeter to centimeter, and the maximum conversion efficiency can reach 92%, usually 70%.<br>
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