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Traditional flat wireless power transmission is charging in a “one-to-one” manner. When the rotation angle of the receiving and transmitting coils is offset, their mutual inductance M and coupling coefficient will decrease. Multi-freedom motor is used in bionics, it is necessary to supply power to the visual acquisition device inside the rotor when rotating, and it is more convenient to use wireless charging instead of wired charging. A receiving structure suitable for moving devices is proposed, which can effectively improve the power transmission efficiency (PTE) when the angle is shifted. In the wireless power transmission, the mutual inductance M and coupling coefficient of the transmitting coil and the single-coil structure, the three-coil structure and its single coil in the rotation are calculated. The advantages and disadvantages of each structure are analyzed. Finally, experiments verify the accuracy and validity of the theory.

Optimal design of wireless power transmission system suitable for multi-degree-of-freedom motion devices