To address the issues of weak multi-degree-of-freedom(DOF)transmission capability

large volume occupation

and high requirement for receiver coil attitude in the transmitting mechanism of magnetically coupled wireless power transfer(WPT)systems

a WPT multi-DOF magnetic field transmitting mechanism based on a 2D magnetically coupled coil was proposed. Firstly

a 2D magnetically coupled transmitting coil structure was designed

a multi-physics field coupling model was established

the magnetic field distribution of the transmitting coil was simulated

and the 3D multi-DOF rotating magnetic field generation capability of the coil structure was verified. Secondly

the generation mechanism of the 3D multi-DOF rotating magnetic field was studied

and an optimization method for the structural parameters of the transmitting coil was proposed. An LCC-S type compensation network transmitting mechanism circuit was designed based on the 3D decoupled rotating magnetic field

which ensures the primary side excitation current is in a constant current state independent of load and coupling coefficient

and the secondary side voltage is in a constant voltage state independent of load. Finally

based on the multi-physics field coupling model

the power transmission effect of the transmitting mechanism was verified through simulation. Experimental results show that the energy transmission of the transmitting mechanism remains stable when the receiver coil attitude changes with multi-degree-of-freedom

and the transmission efficiency is maintained above 61.91% with a maximum of 82.32%

which verifies correctness of the new transmitting mechanism design and the feasibility of the method.